-/* Output routines for GCC for ARM/RISCiX.
- Copyright (C) 1991, 93, 94, 95, 96, 1997 Free Software Foundation, Inc.
+/* Output routines for GCC for ARM.
+ Copyright (C) 1991, 93, 94, 95, 96, 97, 98, 99, 2000 Free Software Foundation, Inc.
Contributed by Pieter `Tiggr' Schoenmakers (rcpieter@win.tue.nl)
- and Martin Simmons (@harleqn.co.uk).
- More major hacks by Richard Earnshaw (rwe11@cl.cam.ac.uk)
+ and Martin Simmons (@harleqn.co.uk).
+ More major hacks by Richard Earnshaw (rearnsha@arm.com).
This file is part of GNU CC.
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
-#include <stdio.h>
-#include <string.h>
-#include "assert.h"
#include "config.h"
+#include "system.h"
#include "rtl.h"
+#include "tree.h"
+#include "tm_p.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "real.h"
#include "insn-attr.h"
#include "flags.h"
#include "reload.h"
-#include "tree.h"
+#include "function.h"
#include "expr.h"
+#include "toplev.h"
+#include "recog.h"
+#include "ggc.h"
+#include "except.h"
+#include "tm_p.h"
+
+/* Forward definitions of types. */
+typedef struct minipool_node Mnode;
+typedef struct minipool_fixup Mfix;
+
+/* In order to improve the layout of the prototypes below
+ some short type abbreviations are defined here. */
+#define Hint HOST_WIDE_INT
+#define Mmode enum machine_mode
+#define Ulong unsigned long
+
+/* Forward function declarations. */
+static void arm_add_gc_roots PARAMS ((void));
+static int arm_gen_constant PARAMS ((enum rtx_code, Mmode, Hint, rtx, rtx, int, int));
+static int arm_naked_function_p PARAMS ((tree));
+static Ulong bit_count PARAMS ((signed int));
+static int const_ok_for_op PARAMS ((Hint, enum rtx_code));
+static int eliminate_lr2ip PARAMS ((rtx *));
+static rtx emit_multi_reg_push PARAMS ((int));
+static rtx emit_sfm PARAMS ((int, int));
+static char * fp_const_from_val PARAMS ((REAL_VALUE_TYPE *));
+static int function_really_clobbers_lr PARAMS ((rtx));
+static arm_cc get_arm_condition_code PARAMS ((rtx));
+static void init_fpa_table PARAMS ((void));
+static Hint int_log2 PARAMS ((Hint));
+static rtx is_jump_table PARAMS ((rtx));
+static char * output_multi_immediate PARAMS ((rtx *, char *, char *, int, Hint));
+static int pattern_really_clobbers_lr PARAMS ((rtx));
+static void print_multi_reg PARAMS ((FILE *, char *, int, int, int));
+static Mmode select_dominance_cc_mode PARAMS ((rtx, rtx, Hint));
+static char * shift_op PARAMS ((rtx, Hint *));
+static void arm_init_machine_status PARAMS ((struct function *));
+static void arm_mark_machine_status PARAMS ((struct function *));
+static int number_of_first_bit_set PARAMS ((int));
+static void replace_symbols_in_block PARAMS ((tree, rtx, rtx));
+static void thumb_exit PARAMS ((FILE *, int, rtx));
+static void thumb_pushpop PARAMS ((FILE *, int, int));
+static char * thumb_condition_code PARAMS ((rtx, int));
+static rtx is_jump_table PARAMS ((rtx));
+static Hint get_jump_table_size PARAMS ((rtx));
+static Mnode * move_minipool_fix_forward_ref PARAMS ((Mnode *, Mnode *, Hint));
+static Mnode * add_minipool_forward_ref PARAMS ((Mfix *));
+static Mnode * move_minipool_fix_backward_ref PARAMS ((Mnode *, Mnode *, Hint));
+static Mnode * add_minipool_backward_ref PARAMS ((Mfix *));
+static void assign_minipool_offsets PARAMS ((Mfix *));
+static void arm_print_value PARAMS ((FILE *, rtx));
+static void dump_minipool PARAMS ((rtx));
+static int arm_barrier_cost PARAMS ((rtx));
+static Mfix * create_fix_barrier PARAMS ((Mfix *, Hint));
+static void push_minipool_barrier PARAMS ((rtx, Hint));
+static void push_minipool_fix PARAMS ((rtx, Hint, rtx *, Mmode, rtx));
+static void note_invalid_constants PARAMS ((rtx, Hint));
+\f
+#undef Hint
+#undef Mmode
+#undef Ulong
/* The maximum number of insns skipped which will be conditionalised if
possible. */
-#define MAX_INSNS_SKIPPED 5
-
-/* Some function declarations. */
-extern FILE *asm_out_file;
-extern char *output_multi_immediate ();
+static int max_insns_skipped = 5;
-HOST_WIDE_INT int_log2 PROTO ((HOST_WIDE_INT));
-static int arm_gen_constant PROTO ((enum rtx_code, enum machine_mode,
- HOST_WIDE_INT, rtx, rtx, int, int));
-static int arm_naked_function_p PROTO ((tree func));
+extern FILE * asm_out_file;
-/* Define the information needed to generate branch insns. This is
- stored from the compare operation. */
+/* True if we are currently building a constant table. */
+int making_const_table;
+/* Define the information needed to generate branch insns. This is
+ stored from the compare operation. */
rtx arm_compare_op0, arm_compare_op1;
-int arm_compare_fp;
-/* What type of cpu are we compiling for? */
-enum processor_type arm_cpu;
-
-/* What type of floating point are we compiling for? */
+/* What type of floating point are we tuning for? */
enum floating_point_type arm_fpu;
-/* What program mode is the cpu running in? 26-bit mode or 32-bit mode */
+/* What type of floating point instructions are available? */
+enum floating_point_type arm_fpu_arch;
+
+/* What program mode is the cpu running in? 26-bit mode or 32-bit mode. */
enum prog_mode_type arm_prgmode;
-char *target_cpu_name = ARM_CPU_NAME;
-char *target_fpe_name = NULL;
+/* Set by the -mfp=... option. */
+const char * target_fp_name = NULL;
+
+/* Used to parse -mstructure_size_boundary command line option. */
+const char * structure_size_string = NULL;
+int arm_structure_size_boundary = DEFAULT_STRUCTURE_SIZE_BOUNDARY;
+
+/* Bit values used to identify processor capabilities. */
+#define FL_CO_PROC (1 << 0) /* Has external co-processor bus */
+#define FL_FAST_MULT (1 << 1) /* Fast multiply */
+#define FL_MODE26 (1 << 2) /* 26-bit mode support */
+#define FL_MODE32 (1 << 3) /* 32-bit mode support */
+#define FL_ARCH4 (1 << 4) /* Architecture rel 4 */
+#define FL_ARCH5 (1 << 5) /* Architecture rel 5 */
+#define FL_THUMB (1 << 6) /* Thumb aware */
+#define FL_LDSCHED (1 << 7) /* Load scheduling necessary */
+#define FL_STRONG (1 << 8) /* StrongARM */
+
+/* The bits in this mask specify which instructions we are
+ allowed to generate. */
+static int insn_flags = 0;
+
+/* The bits in this mask specify which instruction scheduling options should
+ be used. Note - there is an overlap with the FL_FAST_MULT. For some
+ hardware we want to be able to generate the multiply instructions, but to
+ tune as if they were not present in the architecture. */
+static int tune_flags = 0;
+
+/* The following are used in the arm.md file as equivalents to bits
+ in the above two flag variables. */
/* Nonzero if this is an "M" variant of the processor. */
int arm_fast_multiply = 0;
-/* Nonzero if this chip supports the ARM Architecture 4 extensions */
+/* Nonzero if this chip supports the ARM Architecture 4 extensions. */
int arm_arch4 = 0;
+/* Nonzero if this chip supports the ARM Architecture 5 extensions. */
+int arm_arch5 = 0;
+
+/* Nonzero if this chip can benefit from load scheduling. */
+int arm_ld_sched = 0;
+
+/* Nonzero if this chip is a StrongARM. */
+int arm_is_strong = 0;
+
+/* Nonzero if this chip is a an ARM6 or an ARM7. */
+int arm_is_6_or_7 = 0;
+
/* In case of a PRE_INC, POST_INC, PRE_DEC, POST_DEC memory reference, we
must report the mode of the memory reference from PRINT_OPERAND to
PRINT_OPERAND_ADDRESS. */
int current_function_anonymous_args;
/* The register number to be used for the PIC offset register. */
+const char * arm_pic_register_string = NULL;
int arm_pic_register = 9;
-/* Location counter of .text segment. */
-int arm_text_location = 0;
-
/* Set to one if we think that lr is only saved because of subroutine calls,
- but all of these can be `put after' return insns */
+ but all of these can be `put after' return insns. */
int lr_save_eliminated;
/* Set to 1 when a return insn is output, this means that the epilogue
- is not needed. */
+ is not needed. */
+int return_used_this_function;
-static int return_used_this_function;
+/* Set to 1 after arm_reorg has started. Reset to start at the start of
+ the next function. */
+static int after_arm_reorg = 0;
+/* The maximum number of insns to be used when loading a constant. */
static int arm_constant_limit = 3;
/* For an explanation of these variables, see final_prescan_insn below. */
int arm_target_label;
/* The condition codes of the ARM, and the inverse function. */
-char *arm_condition_codes[] =
+char * arm_condition_codes[] =
{
"eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc",
"hi", "ls", "ge", "lt", "gt", "le", "al", "nv"
};
-static enum arm_cond_code get_arm_condition_code ();
-
+#define streq(string1, string2) (strcmp (string1, string2) == 0)
\f
-/* Initialization code */
-
-struct arm_cpu_select arm_select[3] =
-{
- /* switch name, tune arch */
- { (char *)0, "--with-cpu=", 1, 1 },
- { (char *)0, "-mcpu=", 1, 1 },
- { (char *)0, "-mtune=", 1, 0 },
-};
-
-#define FL_CO_PROC 0x01 /* Has external co-processor bus */
-#define FL_FAST_MULT 0x02 /* Fast multiply */
-#define FL_MODE26 0x04 /* 26-bit mode support */
-#define FL_MODE32 0x08 /* 32-bit mode support */
-#define FL_ARCH4 0x10 /* Architecture rel 4 */
-#define FL_THUMB 0x20 /* Thumb aware */
+/* Initialization code. */
struct processors
{
- char *name;
- enum processor_type type;
+ char * name;
unsigned int flags;
};
/* Not all of these give usefully different compilation alternatives,
but there is no simple way of generalizing them. */
-static struct processors all_procs[] =
-{
- {"arm2", PROCESSOR_ARM2, FL_CO_PROC | FL_MODE26},
- {"arm250", PROCESSOR_ARM2, FL_CO_PROC | FL_MODE26},
- {"arm3", PROCESSOR_ARM2, FL_CO_PROC | FL_MODE26},
- {"arm6", PROCESSOR_ARM6, FL_CO_PROC | FL_MODE32 | FL_MODE26},
- {"arm600", PROCESSOR_ARM6, FL_CO_PROC | FL_MODE32 | FL_MODE26},
- {"arm610", PROCESSOR_ARM6, FL_MODE32 | FL_MODE26},
- {"arm7", PROCESSOR_ARM7, FL_CO_PROC | FL_MODE32 | FL_MODE26},
- /* arm7m doesn't exist on its own, only in conjuction with D, (and I), but
- those don't alter the code, so it is sometimes known as the arm7m */
- {"arm7m", PROCESSOR_ARM7, (FL_CO_PROC | FL_FAST_MULT | FL_MODE32
- | FL_MODE26)},
- {"arm7dm", PROCESSOR_ARM7, (FL_CO_PROC | FL_FAST_MULT | FL_MODE32
- | FL_MODE26)},
- {"arm7dmi", PROCESSOR_ARM7, (FL_CO_PROC | FL_FAST_MULT | FL_MODE32
- | FL_MODE26)},
- {"arm700", PROCESSOR_ARM7, FL_CO_PROC | FL_MODE32 | FL_MODE26},
- {"arm710", PROCESSOR_ARM7, FL_MODE32 | FL_MODE26},
- {"arm7100", PROCESSOR_ARM7, FL_MODE32 | FL_MODE26},
- {"arm7500", PROCESSOR_ARM7, FL_MODE32 | FL_MODE26},
- /* Doesn't really have an external co-proc, but does have embedded fpu */
- {"arm7500fe", PROCESSOR_ARM7, FL_CO_PROC | FL_MODE32 | FL_MODE26},
- {"arm7tdmi", PROCESSOR_ARM7, (FL_CO_PROC | FL_FAST_MULT | FL_MODE32
- | FL_ARCH4 | FL_THUMB)},
- {"arm8", PROCESSOR_ARM8, (FL_FAST_MULT | FL_MODE32 | FL_MODE26
- | FL_ARCH4)},
- {"arm810", PROCESSOR_ARM8, (FL_FAST_MULT | FL_MODE32 | FL_MODE26
- | FL_ARCH4)},
- {"strongarm", PROCESSOR_STARM, (FL_FAST_MULT | FL_MODE32 | FL_MODE26
- | FL_ARCH4)},
- {"strongarm110", PROCESSOR_STARM, (FL_FAST_MULT | FL_MODE32 | FL_MODE26
- | FL_ARCH4)},
- {NULL, 0, 0}
+static struct processors all_cores[] =
+{
+ /* ARM Cores */
+
+ {"arm2", FL_CO_PROC | FL_MODE26 },
+ {"arm250", FL_CO_PROC | FL_MODE26 },
+ {"arm3", FL_CO_PROC | FL_MODE26 },
+ {"arm6", FL_CO_PROC | FL_MODE26 | FL_MODE32 },
+ {"arm60", FL_CO_PROC | FL_MODE26 | FL_MODE32 },
+ {"arm600", FL_CO_PROC | FL_MODE26 | FL_MODE32 },
+ {"arm610", FL_MODE26 | FL_MODE32 },
+ {"arm620", FL_CO_PROC | FL_MODE26 | FL_MODE32 },
+ {"arm7", FL_CO_PROC | FL_MODE26 | FL_MODE32 },
+ /* arm7m doesn't exist on its own, but only with D, (and I), but
+ those don't alter the code, so arm7m is sometimes used. */
+ {"arm7m", FL_CO_PROC | FL_MODE26 | FL_MODE32 | FL_FAST_MULT },
+ {"arm7d", FL_CO_PROC | FL_MODE26 | FL_MODE32 },
+ {"arm7dm", FL_CO_PROC | FL_MODE26 | FL_MODE32 | FL_FAST_MULT },
+ {"arm7di", FL_CO_PROC | FL_MODE26 | FL_MODE32 },
+ {"arm7dmi", FL_CO_PROC | FL_MODE26 | FL_MODE32 | FL_FAST_MULT },
+ {"arm70", FL_CO_PROC | FL_MODE26 | FL_MODE32 },
+ {"arm700", FL_CO_PROC | FL_MODE26 | FL_MODE32 },
+ {"arm700i", FL_CO_PROC | FL_MODE26 | FL_MODE32 },
+ {"arm710", FL_MODE26 | FL_MODE32 },
+ {"arm720", FL_MODE26 | FL_MODE32 },
+ {"arm710c", FL_MODE26 | FL_MODE32 },
+ {"arm7100", FL_MODE26 | FL_MODE32 },
+ {"arm7500", FL_MODE26 | FL_MODE32 },
+ /* Doesn't have an external co-proc, but does have embedded fpu. */
+ {"arm7500fe", FL_CO_PROC | FL_MODE26 | FL_MODE32 },
+ {"arm7tdmi", FL_CO_PROC | FL_MODE32 | FL_FAST_MULT | FL_ARCH4 | FL_THUMB },
+ {"arm8", FL_MODE26 | FL_MODE32 | FL_FAST_MULT | FL_ARCH4 | FL_LDSCHED },
+ {"arm810", FL_MODE26 | FL_MODE32 | FL_FAST_MULT | FL_ARCH4 | FL_LDSCHED },
+ {"arm9", FL_MODE32 | FL_FAST_MULT | FL_ARCH4 | FL_THUMB | FL_LDSCHED },
+ {"arm920", FL_MODE32 | FL_FAST_MULT | FL_ARCH4 | FL_LDSCHED },
+ {"arm920t", FL_MODE32 | FL_FAST_MULT | FL_ARCH4 | FL_THUMB | FL_LDSCHED },
+ {"arm9tdmi", FL_MODE32 | FL_FAST_MULT | FL_ARCH4 | FL_THUMB | FL_LDSCHED },
+ {"strongarm", FL_MODE26 | FL_MODE32 | FL_FAST_MULT | FL_ARCH4 | FL_LDSCHED | FL_STRONG },
+ {"strongarm110", FL_MODE26 | FL_MODE32 | FL_FAST_MULT | FL_ARCH4 | FL_LDSCHED | FL_STRONG },
+ {"strongarm1100", FL_MODE26 | FL_MODE32 | FL_FAST_MULT | FL_ARCH4 | FL_LDSCHED | FL_STRONG },
+
+ {NULL, 0}
+};
+
+static struct processors all_architectures[] =
+{
+ /* ARM Architectures */
+
+ { "armv2", FL_CO_PROC | FL_MODE26 },
+ { "armv2a", FL_CO_PROC | FL_MODE26 },
+ { "armv3", FL_CO_PROC | FL_MODE26 | FL_MODE32 },
+ { "armv3m", FL_CO_PROC | FL_MODE26 | FL_MODE32 | FL_FAST_MULT },
+ { "armv4", FL_CO_PROC | FL_MODE26 | FL_MODE32 | FL_FAST_MULT | FL_ARCH4 },
+ /* Strictly, FL_MODE26 is a permitted option for v4t, but there are no
+ implementations that support it, so we will leave it out for now. */
+ { "armv4t", FL_CO_PROC | FL_MODE32 | FL_FAST_MULT | FL_ARCH4 | FL_THUMB },
+ { "armv5", FL_CO_PROC | FL_MODE32 | FL_FAST_MULT | FL_ARCH4 | FL_THUMB | FL_ARCH5 },
+ { NULL, 0 }
+};
+
+/* This is a magic stucture. The 'string' field is magically filled in
+ with a pointer to the value specified by the user on the command line
+ assuming that the user has specified such a value. */
+
+struct arm_cpu_select arm_select[] =
+{
+ /* string name processors */
+ { NULL, "-mcpu=", all_cores },
+ { NULL, "-march=", all_architectures },
+ { NULL, "-mtune=", all_cores }
};
+/* Return the number of bits set in value' */
+static unsigned long
+bit_count (value)
+ signed int value;
+{
+ unsigned long count = 0;
+
+ while (value)
+ {
+ value &= ~(value & - value);
+ ++ count;
+ }
+
+ return count;
+}
+
/* Fix up any incompatible options that the user has specified.
This has now turned into a maze. */
void
arm_override_options ()
{
- int arm_thumb_aware = 0;
- int flags = 0;
- int i;
- struct arm_cpu_select *ptr;
- static struct cpu_default {
- int cpu;
- char *name;
- } cpu_defaults[] = {
- { TARGET_CPU_arm2, "arm2" },
- { TARGET_CPU_arm6, "arm6" },
- { TARGET_CPU_arm610, "arm610" },
- { TARGET_CPU_arm7dm, "arm7dm" },
- { TARGET_CPU_arm7500fe, "arm7500fe" },
- { TARGET_CPU_arm7tdmi, "arm7tdmi" },
- { TARGET_CPU_arm8, "arm8" },
- { TARGET_CPU_arm810, "arm810" },
- { TARGET_CPU_strongarm, "strongarm" },
- { 0, 0 }
- };
- struct cpu_default *def;
-
- /* Set the default. */
- for (def = &cpu_defaults[0]; def->name; ++def)
- if (def->cpu == TARGET_CPU_DEFAULT)
- break;
- if (! def->name)
- abort ();
-
- arm_select[0].string = def->name;
-
- for (i = 0; i < sizeof (arm_select) / sizeof (arm_select[0]); i++)
+ unsigned i;
+
+ /* Set up the flags based on the cpu/architecture selected by the user. */
+ for (i = sizeof (arm_select) / sizeof (arm_select[0]); i--;)
{
- ptr = &arm_select[i];
- if (ptr->string != (char *)0 && ptr->string[0] != '\0')
+ struct arm_cpu_select * ptr = arm_select + i;
+
+ if (ptr->string != NULL && ptr->string[0] != '\0')
{
- struct processors *sel;
+ const struct processors * sel;
- for (sel = all_procs; sel->name != NULL; sel++)
- if (! strcmp (ptr->string, sel->name))
+ for (sel = ptr->processors; sel->name != NULL; sel ++)
+ if (streq (ptr->string, sel->name))
{
- if (ptr->set_tune_p)
- arm_cpu = sel->type;
-
- if (ptr->set_arch_p)
- flags = sel->flags;
+ if (i == 2)
+ tune_flags = sel->flags;
+ else
+ {
+ /* If we have been given an architecture and a processor
+ make sure that they are compatible. We only generate
+ a warning though, and we prefer the CPU over the
+ architecture. */
+ if (insn_flags != 0 && (insn_flags ^ sel->flags))
+ warning ("switch -mcpu=%s conflicts with -march= switch",
+ ptr->string);
+
+ insn_flags = sel->flags;
+ }
+
break;
}
error ("bad value (%s) for %s switch", ptr->string, ptr->name);
}
}
+
+ /* If the user did not specify a processor, choose one for them. */
+ if (insn_flags == 0)
+ {
+ struct processors * sel;
+ unsigned int sought;
+ static struct cpu_default
+ {
+ int cpu;
+ char * name;
+ }
+ cpu_defaults[] =
+ {
+ { TARGET_CPU_arm2, "arm2" },
+ { TARGET_CPU_arm6, "arm6" },
+ { TARGET_CPU_arm610, "arm610" },
+ { TARGET_CPU_arm710, "arm710" },
+ { TARGET_CPU_arm7m, "arm7m" },
+ { TARGET_CPU_arm7500fe, "arm7500fe" },
+ { TARGET_CPU_arm7tdmi, "arm7tdmi" },
+ { TARGET_CPU_arm8, "arm8" },
+ { TARGET_CPU_arm810, "arm810" },
+ { TARGET_CPU_arm9, "arm9" },
+ { TARGET_CPU_strongarm, "strongarm" },
+ { TARGET_CPU_generic, "arm" },
+ { 0, 0 }
+ };
+ struct cpu_default * def;
+
+ /* Find the default. */
+ for (def = cpu_defaults; def->name; def ++)
+ if (def->cpu == TARGET_CPU_DEFAULT)
+ break;
- if (write_symbols != NO_DEBUG && flag_omit_frame_pointer)
- warning ("-g with -fomit-frame-pointer may not give sensible debugging");
+ /* Make sure we found the default CPU. */
+ if (def->name == NULL)
+ abort ();
+
+ /* Find the default CPU's flags. */
+ for (sel = all_cores; sel->name != NULL; sel ++)
+ if (streq (def->name, sel->name))
+ break;
+
+ if (sel->name == NULL)
+ abort ();
- if (TARGET_POKE_FUNCTION_NAME)
- target_flags |= ARM_FLAG_APCS_FRAME;
+ insn_flags = sel->flags;
+
+ /* Now check to see if the user has specified some command line
+ switch that require certain abilities from the cpu. */
+ sought = 0;
+
+ if (TARGET_INTERWORK || TARGET_THUMB)
+ {
+ sought |= (FL_THUMB | FL_MODE32);
+
+ /* Force apcs-32 to be used for interworking. */
+ target_flags |= ARM_FLAG_APCS_32;
+
+ /* There are no ARM processors that support both APCS-26 and
+ interworking. Therefore we force FL_MODE26 to be removed
+ from insn_flags here (if it was set), so that the search
+ below will always be able to find a compatible processor. */
+ insn_flags &= ~ FL_MODE26;
+ }
+ else if (! TARGET_APCS_32)
+ sought |= FL_MODE26;
+
+ if (sought != 0 && ((sought & insn_flags) != sought))
+ {
+ /* Try to locate a CPU type that supports all of the abilities
+ of the default CPU, plus the extra abilities requested by
+ the user. */
+ for (sel = all_cores; sel->name != NULL; sel ++)
+ if ((sel->flags & sought) == (sought | insn_flags))
+ break;
+
+ if (sel->name == NULL)
+ {
+ unsigned int current_bit_count = 0;
+ struct processors * best_fit = NULL;
+
+ /* Ideally we would like to issue an error message here
+ saying that it was not possible to find a CPU compatible
+ with the default CPU, but which also supports the command
+ line options specified by the programmer, and so they
+ ought to use the -mcpu=<name> command line option to
+ override the default CPU type.
+
+ Unfortunately this does not work with multilibing. We
+ need to be able to support multilibs for -mapcs-26 and for
+ -mthumb-interwork and there is no CPU that can support both
+ options. Instead if we cannot find a cpu that has both the
+ characteristics of the default cpu and the given command line
+ options we scan the array again looking for a best match. */
+ for (sel = all_cores; sel->name != NULL; sel ++)
+ if ((sel->flags & sought) == sought)
+ {
+ unsigned int count;
+
+ count = bit_count (sel->flags & insn_flags);
+
+ if (count >= current_bit_count)
+ {
+ best_fit = sel;
+ current_bit_count = count;
+ }
+ }
+
+ if (best_fit == NULL)
+ abort ();
+ else
+ sel = best_fit;
+ }
+
+ insn_flags = sel->flags;
+ }
+ }
+
+ /* If tuning has not been specified, tune for whichever processor or
+ architecture has been selected. */
+ if (tune_flags == 0)
+ tune_flags = insn_flags;
+
+ /* Make sure that the processor choice does not conflict with any of the
+ other command line choices. */
+ if (TARGET_APCS_32 && !(insn_flags & FL_MODE32))
+ {
+ /* If APCS-32 was not the default then it must have been set by the
+ user, so issue a warning message. If the user has specified
+ "-mapcs-32 -mcpu=arm2" then we loose here. */
+ if ((TARGET_DEFAULT & ARM_FLAG_APCS_32) == 0)
+ warning ("target CPU does not support APCS-32" );
+ target_flags &= ~ ARM_FLAG_APCS_32;
+ }
+ else if (! TARGET_APCS_32 && !(insn_flags & FL_MODE26))
+ {
+ warning ("target CPU does not support APCS-26" );
+ target_flags |= ARM_FLAG_APCS_32;
+ }
+
+ if (TARGET_INTERWORK && !(insn_flags & FL_THUMB))
+ {
+ warning ("target CPU does not support interworking" );
+ target_flags &= ~ARM_FLAG_INTERWORK;
+ }
+
+ if (TARGET_THUMB && !(insn_flags & FL_THUMB))
+ {
+ warning ("target CPU does not supoport THUMB instructions.");
+ target_flags &= ~ARM_FLAG_THUMB;
+ }
- if (TARGET_6)
- warning ("Option '-m6' deprecated. Use: '-mapcs-32' or -mcpu=<proc>");
+ if (TARGET_APCS_FRAME && TARGET_THUMB)
+ {
+ /* warning ("ignoring -mapcs-frame because -mthumb was used."); */
+ target_flags &= ~ARM_FLAG_APCS_FRAME;
+ }
+
+ /* TARGET_BACKTRACE calls leaf_function_p, which causes a crash if done
+ from here where no function is being compiled currently. */
+ if ((target_flags & (THUMB_FLAG_LEAF_BACKTRACE | THUMB_FLAG_BACKTRACE))
+ && TARGET_ARM)
+ warning ("enabling backtrace support is only meaningful when compiling for the Thumb.");
+
+ if (TARGET_ARM && TARGET_CALLEE_INTERWORKING)
+ warning ("enabling callee interworking support is only meaningful when compiling for the Thumb.");
- if (TARGET_3)
- warning ("Option '-m3' deprecated. Use: '-mapcs-26' or -mcpu=<proc>");
+ if (TARGET_ARM && TARGET_CALLER_INTERWORKING)
+ warning ("enabling caller interworking support is only meaningful when compiling for the Thumb.");
+ /* If interworking is enabled then APCS-32 must be selected as well. */
+ if (TARGET_INTERWORK)
+ {
+ if (! TARGET_APCS_32)
+ warning ("interworking forces APCS-32 to be used" );
+ target_flags |= ARM_FLAG_APCS_32;
+ }
+
+ if (TARGET_APCS_STACK && ! TARGET_APCS_FRAME)
+ {
+ warning ("-mapcs-stack-check incompatible with -mno-apcs-frame");
+ target_flags |= ARM_FLAG_APCS_FRAME;
+ }
+
+ if (TARGET_POKE_FUNCTION_NAME)
+ target_flags |= ARM_FLAG_APCS_FRAME;
+
if (TARGET_APCS_REENT && flag_pic)
fatal ("-fpic and -mapcs-reent are incompatible");
-
+
if (TARGET_APCS_REENT)
- warning ("APCS reentrant code not supported.");
-
+ warning ("APCS reentrant code not supported. Ignored");
+
+ /* If this target is normally configured to use APCS frames, warn if they
+ are turned off and debugging is turned on. */
+ if (TARGET_ARM
+ && write_symbols != NO_DEBUG
+ && ! TARGET_APCS_FRAME
+ && (TARGET_DEFAULT & ARM_FLAG_APCS_FRAME))
+ warning ("-g with -mno-apcs-frame may not give sensible debugging");
+
/* If stack checking is disabled, we can use r10 as the PIC register,
which keeps r9 available. */
if (flag_pic && ! TARGET_APCS_STACK)
arm_pic_register = 10;
-
- /* Well, I'm about to have a go, but pic is NOT going to be compatible
- with APCS reentrancy, since that requires too much support in the
- assembler and linker, and the ARMASM assembler seems to lack some
- required directives. */
- if (flag_pic)
- warning ("Position independent code not supported. Ignored");
-
+
if (TARGET_APCS_FLOAT)
warning ("Passing floating point arguments in fp regs not yet supported");
-
- if (TARGET_APCS_STACK && ! TARGET_APCS)
- {
- warning ("-mapcs-stack-check incompatible with -mno-apcs-frame");
- target_flags |= ARM_FLAG_APCS_FRAME;
- }
-
- arm_fpu = FP_HARD;
-
+
+ /* Initialise boolean versions of the flags, for use in the arm.md file. */
+ arm_fast_multiply = (insn_flags & FL_FAST_MULT) != 0;
+ arm_arch4 = (insn_flags & FL_ARCH4) != 0;
+ arm_arch5 = (insn_flags & FL_ARCH5) != 0;
+
+ arm_ld_sched = (tune_flags & FL_LDSCHED) != 0;
+ arm_is_strong = (tune_flags & FL_STRONG) != 0;
+ arm_is_6_or_7 = (((tune_flags & (FL_MODE26 | FL_MODE32))
+ && !(tune_flags & FL_ARCH4))) != 0;
+
/* Default value for floating point code... if no co-processor
bus, then schedule for emulated floating point. Otherwise,
- assume the user has an FPA, unless overridden with -mfpe-... */
- if (flags & FL_CO_PROC == 0)
- arm_fpu = FP_SOFT3;
- else
- arm_fpu = FP_HARD;
- arm_fast_multiply = (flags & FL_FAST_MULT) != 0;
- arm_arch4 = (flags & FL_ARCH4) != 0;
- arm_thumb_aware = (flags & FL_THUMB) != 0;
-
- if (target_fpe_name)
+ assume the user has an FPA.
+ Note: this does not prevent use of floating point instructions,
+ -msoft-float does that. */
+ arm_fpu = (tune_flags & FL_CO_PROC) ? FP_HARD : FP_SOFT3;
+
+ if (target_fp_name)
{
- if (strcmp (target_fpe_name, "2") == 0)
- arm_fpu = FP_SOFT2;
- else if (strcmp (target_fpe_name, "3") == 0)
- arm_fpu = FP_SOFT3;
+ if (streq (target_fp_name, "2"))
+ arm_fpu_arch = FP_SOFT2;
+ else if (streq (target_fp_name, "3"))
+ arm_fpu_arch = FP_SOFT3;
else
fatal ("Invalid floating point emulation option: -mfpe-%s",
- target_fpe_name);
- }
-
- if (TARGET_THUMB_INTERWORK && ! arm_thumb_aware)
- {
- warning ("This processor variant does not support Thumb interworking");
- target_flags &= ~ARM_FLAG_THUMB;
+ target_fp_name);
}
-
+ else
+ arm_fpu_arch = FP_DEFAULT;
+
if (TARGET_FPE && arm_fpu != FP_HARD)
arm_fpu = FP_SOFT2;
-
+
/* For arm2/3 there is no need to do any scheduling if there is only
a floating point emulator, or we are doing software floating-point. */
- if ((TARGET_SOFT_FLOAT || arm_fpu != FP_HARD) && arm_cpu == PROCESSOR_ARM2)
+ if ((TARGET_SOFT_FLOAT || arm_fpu != FP_HARD)
+ && (tune_flags & FL_MODE32) == 0)
flag_schedule_insns = flag_schedule_insns_after_reload = 0;
-
+
arm_prog_mode = TARGET_APCS_32 ? PROG_MODE_PROG32 : PROG_MODE_PROG26;
-}
-\f
+
+ if (structure_size_string != NULL)
+ {
+ int size = strtol (structure_size_string, NULL, 0);
+
+ if (size == 8 || size == 32)
+ arm_structure_size_boundary = size;
+ else
+ warning ("Structure size boundary can only be set to 8 or 32");
+ }
+
+ if (arm_pic_register_string != NULL)
+ {
+ int pic_register;
+
+ if (! flag_pic)
+ warning ("-mpic-register= is useless without -fpic");
+
+ pic_register = decode_reg_name (arm_pic_register_string);
+
+ /* Prevent the user from choosing an obviously stupid PIC register. */
+ if (pic_register < 0 || call_used_regs[pic_register]
+ || pic_register == HARD_FRAME_POINTER_REGNUM
+ || pic_register == STACK_POINTER_REGNUM
+ || pic_register >= PC_REGNUM)
+ error ("Unable to use '%s' for PIC register", arm_pic_register_string);
+ else
+ arm_pic_register = pic_register;
+ }
+
+ if (TARGET_THUMB && flag_schedule_insns)
+ {
+ /* Don't warn since it's on by default in -O2. */
+ flag_schedule_insns = 0;
+ }
-/* Return 1 if it is possible to return using a single instruction */
+ /* If optimizing for space, don't synthesize constants.
+ For processors with load scheduling, it never costs more than 2 cycles
+ to load a constant, and the load scheduler may well reduce that to 1. */
+ if (optimize_size || (tune_flags & FL_LDSCHED))
+ arm_constant_limit = 1;
+
+ /* If optimizing for size, bump the number of instructions that we
+ are prepared to conditionally execute (even on a StrongARM).
+ Otherwise for the StrongARM, which has early execution of branches,
+ a sequence that is worth skipping is shorter. */
+ if (optimize_size)
+ max_insns_skipped = 6;
+ else if (arm_is_strong)
+ max_insns_skipped = 3;
+
+ /* Register global variables with the garbage collector. */
+ arm_add_gc_roots ();
+}
+static void
+arm_add_gc_roots ()
+{
+ ggc_add_rtx_root (&arm_compare_op0, 1);
+ ggc_add_rtx_root (&arm_compare_op1, 1);
+ ggc_add_rtx_root (&arm_target_insn, 1); /* Not sure this is really a root */
+ /* XXX: What about the minipool tables? */
+}
+\f
+/* Return 1 if it is possible to return using a single instruction. */
int
-use_return_insn ()
+use_return_insn (iscond)
+ int iscond;
{
int regno;
- if (!reload_completed ||current_function_pretend_args_size
+ /* Never use a return instruction before reload has run. */
+ if (! reload_completed
+ /* Or if the function is variadic. */
+ || current_function_pretend_args_size
|| current_function_anonymous_args
- || (get_frame_size () && !(TARGET_APCS || frame_pointer_needed)))
+ /* Of if the function calls __builtin_eh_return () */
+ || cfun->machine->eh_epilogue_sp_ofs != NULL
+ /* Or if there is no frame pointer and there is a stack adjustment. */
+ || ((get_frame_size () + current_function_outgoing_args_size != 0)
+ && ! frame_pointer_needed))
+ return 0;
+
+ /* Can't be done if interworking with Thumb, and any registers have been
+ stacked. Similarly, on StrongARM, conditional returns are expensive
+ if they aren't taken and registers have been stacked. */
+ if (iscond && arm_is_strong && frame_pointer_needed)
return 0;
+
+ if ((iscond && arm_is_strong)
+ || TARGET_INTERWORK)
+ {
+ for (regno = 0; regno <= LAST_ARM_REGNUM; regno++)
+ if (regs_ever_live[regno] && ! call_used_regs[regno])
+ return 0;
+ if (flag_pic && regs_ever_live[PIC_OFFSET_TABLE_REGNUM])
+ return 0;
+ }
+
/* Can't be done if any of the FPU regs are pushed, since this also
- requires an insn */
- for (regno = 20; regno < 24; regno++)
- if (regs_ever_live[regno])
- return 0;
+ requires an insn. */
+ if (TARGET_HARD_FLOAT)
+ for (regno = FIRST_ARM_FP_REGNUM; regno <= LAST_ARM_FP_REGNUM; regno++)
+ if (regs_ever_live[regno] && ! call_used_regs[regno])
+ return 0;
/* If a function is naked, don't use the "return" insn. */
if (arm_naked_function_p (current_function_decl))
const_ok_for_arm (i)
HOST_WIDE_INT i;
{
- unsigned HOST_WIDE_INT mask = ~0xFF;
-
+ unsigned HOST_WIDE_INT mask = ~ HOST_UINT (0xFF);
+
+ /* For machines with >32 bit HOST_WIDE_INT, the bits above bit 31 must
+ be all zero, or all one. */
+ if ((i & ~ HOST_UINT (0xffffffff)) != 0
+ && ((i & ~ HOST_UINT (0xffffffff))
+ != ((~ HOST_UINT (0))
+ & ~ HOST_UINT (0xffffffff))))
+ return FALSE;
+
/* Fast return for 0 and powers of 2 */
if ((i & (i - 1)) == 0)
return TRUE;
do
{
- if ((i & mask & (unsigned HOST_WIDE_INT) 0xffffffff) == 0)
+ if ((i & mask & HOST_UINT (0xffffffff)) == 0)
return TRUE;
mask =
- (mask << 2) | ((mask & (unsigned HOST_WIDE_INT) 0xffffffff)
- >> (32 - 2)) | ~((unsigned HOST_WIDE_INT) 0xffffffff);
- } while (mask != ~0xFF);
+ (mask << 2) | ((mask & HOST_UINT (0xffffffff))
+ >> (32 - 2)) | ~(HOST_UINT (0xffffffff));
+ } while (mask != ~ HOST_UINT (0xFF));
return FALSE;
}
-/* Return true if I is a valid constant for the operation CODE. */
-int
-const_ok_for_op (i, code, mode)
+/* Return true if I is a valid constant for the operation CODE. */
+static int
+const_ok_for_op (i, code)
HOST_WIDE_INT i;
enum rtx_code code;
- enum machine_mode mode;
{
if (const_ok_for_arm (i))
return 1;
|| (GET_CODE (target) == REG && GET_CODE (source) == REG
&& REGNO (target) != REGNO (source)))
{
- rtx temp;
-
- if (arm_gen_constant (code, mode, val, target, source, 1, 0)
- > arm_constant_limit + (code != SET))
+ /* After arm_reorg has been called, we can't fix up expensive
+ constants by pushing them into memory so we must synthesise
+ them in-line, regardless of the cost. This is only likely to
+ be more costly on chips that have load delay slots and we are
+ compiling without running the scheduler (so no splitting
+ occurred before the final instruction emission).
+
+ Ref: gcc -O1 -mcpu=strongarm gcc.c-torture/compile/980506-2.c
+ */
+ if (! after_arm_reorg
+ && (arm_gen_constant (code, mode, val, target, source, 1, 0)
+ > arm_constant_limit + (code != SET)))
{
if (code == SET)
{
/* Currently SET is the only monadic value for CODE, all
the rest are diadic. */
- emit_insn (gen_rtx (SET, VOIDmode, target, GEN_INT (val)));
+ emit_insn (gen_rtx_SET (VOIDmode, target, GEN_INT (val)));
return 1;
}
else
{
rtx temp = subtargets ? gen_reg_rtx (mode) : target;
- emit_insn (gen_rtx (SET, VOIDmode, temp, GEN_INT (val)));
+ emit_insn (gen_rtx_SET (VOIDmode, temp, GEN_INT (val)));
/* For MINUS, the value is subtracted from, since we never
have subtraction of a constant. */
if (code == MINUS)
- emit_insn (gen_rtx (SET, VOIDmode, target,
- gen_rtx (code, mode, temp, source)));
+ emit_insn (gen_rtx_SET (VOIDmode, target,
+ gen_rtx_MINUS (mode, temp, source)));
else
- emit_insn (gen_rtx (SET, VOIDmode, target,
- gen_rtx (code, mode, source, temp)));
+ emit_insn (gen_rtx_SET (VOIDmode, target,
+ gen_rtx (code, mode, source, temp)));
return 2;
}
}
/* As above, but extra parameter GENERATE which, if clear, suppresses
RTL generation. */
-int
+static int
arm_gen_constant (code, mode, val, target, source, subtargets, generate)
enum rtx_code code;
enum machine_mode mode;
int subtargets;
int generate;
{
- int can_add = 0;
int can_invert = 0;
int can_negate = 0;
int can_negate_initial = 0;
int clear_zero_bit_copies = 0;
int set_zero_bit_copies = 0;
int insns = 0;
- rtx new_src;
unsigned HOST_WIDE_INT temp1, temp2;
- unsigned HOST_WIDE_INT remainder = val & 0xffffffff;
+ unsigned HOST_WIDE_INT remainder = val & HOST_UINT (0xffffffff);
- /* find out which operations are safe for a given CODE. Also do a quick
+ /* Find out which operations are safe for a given CODE. Also do a quick
check for degenerate cases; these can occur when DImode operations
are split. */
switch (code)
break;
case IOR:
- if (remainder == 0xffffffff)
+ if (remainder == HOST_UINT (0xffffffff))
{
if (generate)
- emit_insn (gen_rtx (SET, VOIDmode, target,
- GEN_INT (ARM_SIGN_EXTEND (val))));
+ emit_insn (gen_rtx_SET (VOIDmode, target,
+ GEN_INT (ARM_SIGN_EXTEND (val))));
return 1;
}
if (remainder == 0)
if (reload_completed && rtx_equal_p (target, source))
return 0;
if (generate)
- emit_insn (gen_rtx (SET, VOIDmode, target, source));
+ emit_insn (gen_rtx_SET (VOIDmode, target, source));
return 1;
}
break;
if (remainder == 0)
{
if (generate)
- emit_insn (gen_rtx (SET, VOIDmode, target, const0_rtx));
+ emit_insn (gen_rtx_SET (VOIDmode, target, const0_rtx));
return 1;
}
- if (remainder == 0xffffffff)
+ if (remainder == HOST_UINT (0xffffffff))
{
if (reload_completed && rtx_equal_p (target, source))
return 0;
if (generate)
- emit_insn (gen_rtx (SET, VOIDmode, target, source));
+ emit_insn (gen_rtx_SET (VOIDmode, target, source));
return 1;
}
can_invert = 1;
if (reload_completed && rtx_equal_p (target, source))
return 0;
if (generate)
- emit_insn (gen_rtx (SET, VOIDmode, target, source));
+ emit_insn (gen_rtx_SET (VOIDmode, target, source));
return 1;
}
- if (remainder == 0xffffffff)
+ if (remainder == HOST_UINT (0xffffffff))
{
if (generate)
- emit_insn (gen_rtx (SET, VOIDmode, target,
- gen_rtx (NOT, mode, source)));
+ emit_insn (gen_rtx_SET (VOIDmode, target,
+ gen_rtx_NOT (mode, source)));
return 1;
}
if (remainder == 0)
{
if (generate)
- emit_insn (gen_rtx (SET, VOIDmode, target,
- gen_rtx (NEG, mode, source)));
+ emit_insn (gen_rtx_SET (VOIDmode, target,
+ gen_rtx_NEG (mode, source)));
return 1;
}
if (const_ok_for_arm (val))
{
if (generate)
- emit_insn (gen_rtx (SET, VOIDmode, target,
- gen_rtx (MINUS, mode, GEN_INT (val), source)));
+ emit_insn (gen_rtx_SET (VOIDmode, target,
+ gen_rtx_MINUS (mode, GEN_INT (val),
+ source)));
return 1;
}
can_negate = 1;
abort ();
}
- /* If we can do it in one insn get out quickly */
+ /* If we can do it in one insn get out quickly. */
if (const_ok_for_arm (val)
|| (can_negate_initial && const_ok_for_arm (-val))
|| (can_invert && const_ok_for_arm (~val)))
{
if (generate)
- emit_insn (gen_rtx (SET, VOIDmode, target,
- (source ? gen_rtx (code, mode, source,
- GEN_INT (val))
- : GEN_INT (val))));
+ emit_insn (gen_rtx_SET (VOIDmode, target,
+ (source ? gen_rtx (code, mode, source,
+ GEN_INT (val))
+ : GEN_INT (val))));
return 1;
}
-
/* Calculate a few attributes that may be useful for specific
- optimizations. */
-
+ optimizations. */
for (i = 31; i >= 0; i--)
{
if ((remainder & (1 << i)) == 0)
{
if (generate)
{
- new_src = subtargets ? gen_reg_rtx (mode) : target;
- emit_insn (gen_rtx (SET, VOIDmode, new_src,
- GEN_INT (temp1)));
+ rtx new_src = subtargets ? gen_reg_rtx (mode) : target;
+ emit_insn (gen_rtx_SET (VOIDmode, new_src,
+ GEN_INT (temp1)));
emit_insn (gen_ashrsi3 (target, new_src,
GEN_INT (set_sign_bit_copies - 1)));
}
{
if (generate)
{
- new_src = subtargets ? gen_reg_rtx (mode) : target;
- emit_insn (gen_rtx (SET, VOIDmode, new_src,
- GEN_INT (temp1)));
+ rtx new_src = subtargets ? gen_reg_rtx (mode) : target;
+ emit_insn (gen_rtx_SET (VOIDmode, new_src,
+ GEN_INT (temp1)));
emit_insn (gen_ashrsi3 (target, new_src,
GEN_INT (set_sign_bit_copies - 1)));
}
word. We only look for the simplest cases, to do more would cost
too much. Be careful, however, not to generate this when the
alternative would take fewer insns. */
- if (val & 0xffff0000)
+ if (val & HOST_UINT (0xffff0000))
{
- temp1 = remainder & 0xffff0000;
+ temp1 = remainder & HOST_UINT (0xffff0000);
temp2 = remainder & 0x0000ffff;
- /* Overlaps outside this range are best done using other methods. */
+ /* Overlaps outside this range are best done using other methods. */
for (i = 9; i < 24; i++)
{
- if ((((temp2 | (temp2 << i)) & 0xffffffff) == remainder)
+ if ((((temp2 | (temp2 << i))
+ & HOST_UINT (0xffffffff)) == remainder)
&& ! const_ok_for_arm (temp2))
{
- insns = arm_gen_constant (code, mode, temp2,
- new_src = (subtargets
- ? gen_reg_rtx (mode)
- : target),
+ rtx new_src = (subtargets
+ ? (generate ? gen_reg_rtx (mode) : NULL_RTX)
+ : target);
+ insns = arm_gen_constant (code, mode, temp2, new_src,
source, subtargets, generate);
source = new_src;
if (generate)
- emit_insn (gen_rtx (SET, VOIDmode, target,
- gen_rtx (IOR, mode,
- gen_rtx (ASHIFT, mode, source,
- GEN_INT (i)),
- source)));
+ emit_insn (gen_rtx_SET
+ (VOIDmode, target,
+ gen_rtx_IOR (mode,
+ gen_rtx_ASHIFT (mode, source,
+ GEN_INT (i)),
+ source)));
return insns + 1;
}
}
- /* Don't duplicate cases already considered. */
+ /* Don't duplicate cases already considered. */
for (i = 17; i < 24; i++)
{
if (((temp1 | (temp1 >> i)) == remainder)
&& ! const_ok_for_arm (temp1))
{
- insns = arm_gen_constant (code, mode, temp1,
- new_src = (subtargets
- ? gen_reg_rtx (mode)
- : target),
+ rtx new_src = (subtargets
+ ? (generate ? gen_reg_rtx (mode) : NULL_RTX)
+ : target);
+ insns = arm_gen_constant (code, mode, temp1, new_src,
source, subtargets, generate);
source = new_src;
if (generate)
- emit_insn (gen_rtx (SET, VOIDmode, target,
- gen_rtx (IOR, mode,
- gen_rtx (LSHIFTRT, mode,
- source, GEN_INT (i)),
- source)));
+ emit_insn
+ (gen_rtx_SET (VOIDmode, target,
+ gen_rtx_IOR
+ (mode,
+ gen_rtx_LSHIFTRT (mode, source,
+ GEN_INT (i)),
+ source)));
return insns + 1;
}
}
single instruction, and we can find a temporary to put it in,
then this can be done in two instructions instead of 3-4. */
if (subtargets
+ /* TARGET can't be NULL if SUBTARGETS is 0 */
|| (reload_completed && ! reg_mentioned_p (target, source)))
{
if (const_ok_for_arm (ARM_SIGN_EXTEND (~ val)))
{
rtx sub = subtargets ? gen_reg_rtx (mode) : target;
- emit_insn (gen_rtx (SET, VOIDmode, sub, GEN_INT (val)));
- emit_insn (gen_rtx (SET, VOIDmode, target,
- gen_rtx (code, mode, source, sub)));
+ emit_insn (gen_rtx_SET (VOIDmode, sub, GEN_INT (val)));
+ emit_insn (gen_rtx_SET (VOIDmode, target,
+ gen_rtx (code, mode, source, sub)));
}
return 2;
}
rtx sub = subtargets ? gen_reg_rtx (mode) : target;
rtx shift = GEN_INT (set_sign_bit_copies);
- emit_insn (gen_rtx (SET, VOIDmode, sub,
- gen_rtx (NOT, mode,
- gen_rtx (ASHIFT, mode, source,
- shift))));
- emit_insn (gen_rtx (SET, VOIDmode, target,
- gen_rtx (NOT, mode,
- gen_rtx (LSHIFTRT, mode, sub,
- shift))));
+ emit_insn (gen_rtx_SET (VOIDmode, sub,
+ gen_rtx_NOT (mode,
+ gen_rtx_ASHIFT (mode,
+ source,
+ shift))));
+ emit_insn (gen_rtx_SET (VOIDmode, target,
+ gen_rtx_NOT (mode,
+ gen_rtx_LSHIFTRT (mode, sub,
+ shift))));
}
return 2;
}
rtx sub = subtargets ? gen_reg_rtx (mode) : target;
rtx shift = GEN_INT (set_zero_bit_copies);
- emit_insn (gen_rtx (SET, VOIDmode, sub,
- gen_rtx (NOT, mode,
- gen_rtx (LSHIFTRT, mode, source,
- shift))));
- emit_insn (gen_rtx (SET, VOIDmode, target,
- gen_rtx (NOT, mode,
- gen_rtx (ASHIFT, mode, sub,
- shift))));
+ emit_insn (gen_rtx_SET (VOIDmode, sub,
+ gen_rtx_NOT (mode,
+ gen_rtx_LSHIFTRT (mode,
+ source,
+ shift))));
+ emit_insn (gen_rtx_SET (VOIDmode, target,
+ gen_rtx_NOT (mode,
+ gen_rtx_ASHIFT (mode, sub,
+ shift))));
}
return 2;
}
if (generate)
{
rtx sub = subtargets ? gen_reg_rtx (mode) : target;
- emit_insn (gen_rtx (SET, VOIDmode, sub,
- gen_rtx (NOT, mode, source)));
+ emit_insn (gen_rtx_SET (VOIDmode, sub,
+ gen_rtx_NOT (mode, source)));
source = sub;
if (subtargets)
sub = gen_reg_rtx (mode);
- emit_insn (gen_rtx (SET, VOIDmode, sub,
- gen_rtx (AND, mode, source,
- GEN_INT (temp1))));
- emit_insn (gen_rtx (SET, VOIDmode, target,
- gen_rtx (NOT, mode, sub)));
+ emit_insn (gen_rtx_SET (VOIDmode, sub,
+ gen_rtx_AND (mode, source,
+ GEN_INT (temp1))));
+ emit_insn (gen_rtx_SET (VOIDmode, target,
+ gen_rtx_NOT (mode, sub)));
}
return 3;
}
/* See if two shifts will do 2 or more insn's worth of work. */
if (clear_sign_bit_copies >= 16 && clear_sign_bit_copies < 24)
{
- HOST_WIDE_INT shift_mask = ((0xffffffff
+ HOST_WIDE_INT shift_mask = (((HOST_UINT (0xffffffff))
<< (32 - clear_sign_bit_copies))
- & 0xffffffff);
- rtx new_source;
- rtx shift;
+ & HOST_UINT (0xffffffff));
- if ((remainder | shift_mask) != 0xffffffff)
+ if ((remainder | shift_mask) != HOST_UINT (0xffffffff))
{
if (generate)
{
- new_source = subtargets ? gen_reg_rtx (mode) : target;
+ rtx new_src = subtargets ? gen_reg_rtx (mode) : target;
insns = arm_gen_constant (AND, mode, remainder | shift_mask,
- new_source, source, subtargets, 1);
- source = new_source;
+ new_src, source, subtargets, 1);
+ source = new_src;
}
else
- insns = arm_gen_constant (AND, mode, remainder | shift_mask,
- new_source, source, subtargets, 0);
+ {
+ rtx targ = subtargets ? NULL_RTX : target;
+ insns = arm_gen_constant (AND, mode, remainder | shift_mask,
+ targ, source, subtargets, 0);
+ }
}
if (generate)
{
- shift = GEN_INT (clear_sign_bit_copies);
- new_source = subtargets ? gen_reg_rtx (mode) : target;
- emit_insn (gen_ashlsi3 (new_source, source, shift));
- emit_insn (gen_lshrsi3 (target, new_source, shift));
+ rtx new_src = subtargets ? gen_reg_rtx (mode) : target;
+ rtx shift = GEN_INT (clear_sign_bit_copies);
+
+ emit_insn (gen_ashlsi3 (new_src, source, shift));
+ emit_insn (gen_lshrsi3 (target, new_src, shift));
}
return insns + 2;
if (clear_zero_bit_copies >= 16 && clear_zero_bit_copies < 24)
{
HOST_WIDE_INT shift_mask = (1 << clear_zero_bit_copies) - 1;
- rtx new_source;
- rtx shift;
- if ((remainder | shift_mask) != 0xffffffff)
+ if ((remainder | shift_mask) != HOST_UINT (0xffffffff))
{
if (generate)
{
- new_source = subtargets ? gen_reg_rtx (mode) : target;
+ rtx new_src = subtargets ? gen_reg_rtx (mode) : target;
+
insns = arm_gen_constant (AND, mode, remainder | shift_mask,
- new_source, source, subtargets, 1);
- source = new_source;
+ new_src, source, subtargets, 1);
+ source = new_src;
}
else
- insns = arm_gen_constant (AND, mode, remainder | shift_mask,
- new_source, source, subtargets, 0);
+ {
+ rtx targ = subtargets ? NULL_RTX : target;
+
+ insns = arm_gen_constant (AND, mode, remainder | shift_mask,
+ targ, source, subtargets, 0);
+ }
}
if (generate)
{
- shift = GEN_INT (clear_zero_bit_copies);
- new_source = subtargets ? gen_reg_rtx (mode) : target;
- emit_insn (gen_lshrsi3 (new_source, source, shift));
- emit_insn (gen_ashlsi3 (target, new_source, shift));
+ rtx new_src = subtargets ? gen_reg_rtx (mode) : target;
+ rtx shift = GEN_INT (clear_zero_bit_copies);
+
+ emit_insn (gen_lshrsi3 (new_src, source, shift));
+ emit_insn (gen_ashlsi3 (target, new_src, shift));
}
return insns + 2;
num_bits_set++;
if (code == AND || (can_invert && num_bits_set > 16))
- remainder = (~remainder) & 0xffffffff;
+ remainder = (~remainder) & HOST_UINT (0xffffffff);
else if (code == PLUS && num_bits_set > 16)
- remainder = (-remainder) & 0xffffffff;
+ remainder = (-remainder) & HOST_UINT (0xffffffff);
else
{
can_invert = 0;
We start by looking for the largest block of zeros that are aligned on
a 2-bit boundary, we then fill up the temps, wrapping around to the
top of the word when we drop off the bottom.
- In the worst case this code should produce no more than four insns. */
+ In the worst case this code should produce no more than four insns. */
{
int best_start = 0;
int best_consecutive_zeros = 0;
/* Now start emitting the insns, starting with the one with the highest
bit set: we do this so that the smallest number will be emitted last;
- this is more likely to be combinable with addressing insns. */
+ this is more likely to be combinable with addressing insns. */
i = best_start;
do
{
| ((i < end) ? (0xff >> (32 - end)) : 0));
remainder &= ~temp1;
+ if (generate)
+ {
+ rtx new_src;
+
+ if (code == SET)
+ emit_insn (gen_rtx_SET (VOIDmode,
+ new_src = (subtargets
+ ? gen_reg_rtx (mode)
+ : target),
+ GEN_INT (can_invert
+ ? ~temp1 : temp1)));
+ else if (code == MINUS)
+ emit_insn (gen_rtx_SET (VOIDmode,
+ new_src = (subtargets
+ ? gen_reg_rtx (mode)
+ : target),
+ gen_rtx (code, mode, GEN_INT (temp1),
+ source)));
+ else
+ emit_insn (gen_rtx_SET (VOIDmode,
+ new_src = (remainder
+ ? (subtargets
+ ? gen_reg_rtx (mode)
+ : target)
+ : target),
+ gen_rtx (code, mode, source,
+ GEN_INT (can_invert ? ~temp1
+ : (can_negate
+ ? -temp1
+ : temp1)))));
+ source = new_src;
+ }
+
if (code == SET)
{
- if (generate)
- emit_insn (gen_rtx (SET, VOIDmode,
- new_src = (subtargets
- ? gen_reg_rtx (mode)
- : target),
- GEN_INT (can_invert ? ~temp1 : temp1)));
can_invert = 0;
code = PLUS;
}
else if (code == MINUS)
- {
- if (generate)
- emit_insn (gen_rtx (SET, VOIDmode,
- new_src = (subtargets
- ? gen_reg_rtx (mode)
- : target),
- gen_rtx (code, mode, GEN_INT (temp1),
- source)));
- code = PLUS;
- }
- else
- {
- if (generate)
- emit_insn (gen_rtx (SET, VOIDmode,
- new_src = (remainder
- ? (subtargets
- ? gen_reg_rtx (mode)
- : target)
- : target),
- gen_rtx (code, mode, source,
- GEN_INT (can_invert ? ~temp1
- : (can_negate
- ? -temp1
- : temp1)))));
- }
+ code = PLUS;
insns++;
- source = new_src;
i -= 6;
}
i -= 2;
enum rtx_code
arm_canonicalize_comparison (code, op1)
enum rtx_code code;
- rtx *op1;
+ rtx * op1;
{
- HOST_WIDE_INT i = INTVAL (*op1);
+ unsigned HOST_WIDE_INT i = INTVAL (*op1);
switch (code)
{
case GT:
case LE:
- if (i != (1 << (HOST_BITS_PER_WIDE_INT - 1) - 1)
+ if (i != (((HOST_UINT (1)) << (HOST_BITS_PER_WIDE_INT - 1))
+ - 1)
&& (const_ok_for_arm (i+1) || const_ok_for_arm (- (i+1))))
{
*op1 = GEN_INT (i+1);
case GE:
case LT:
- if (i != (1 << (HOST_BITS_PER_WIDE_INT - 1))
+ if (i != ((HOST_UINT (1)) << (HOST_BITS_PER_WIDE_INT - 1))
&& (const_ok_for_arm (i-1) || const_ok_for_arm (- (i-1))))
{
*op1 = GEN_INT (i-1);
case GTU:
case LEU:
- if (i != ~0
+ if (i != ~ (HOST_UINT (0))
&& (const_ok_for_arm (i+1) || const_ok_for_arm (- (i+1))))
{
*op1 = GEN_INT (i + 1);
return code;
}
-
-/* Handle aggregates that are not laid out in a BLKmode element.
- This is a sub-element of RETURN_IN_MEMORY. */
+/* Decide whether a type should be returned in memory (true)
+ or in a register (false). This is called by the macro
+ RETURN_IN_MEMORY. */
int
arm_return_in_memory (type)
tree type;
{
+ if (! AGGREGATE_TYPE_P (type))
+ /* All simple types are returned in registers. */
+ return 0;
+
+ /* For the arm-wince targets we choose to be compitable with Microsoft's
+ ARM and Thumb compilers, which always return aggregates in memory. */
+#ifndef ARM_WINCE
+
+ if (int_size_in_bytes (type) > 4)
+ /* All structures/unions bigger than one word are returned in memory. */
+ return 1;
+
if (TREE_CODE (type) == RECORD_TYPE)
{
tree field;
- /* For a struct, we can return in a register if every element was a
- bit-field. */
- for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
- if (TREE_CODE (field) != FIELD_DECL
- || ! DECL_BIT_FIELD_TYPE (field))
- return 1;
+ /* For a struct the APCS says that we only return in a register
+ if the type is 'integer like' and every addressable element
+ has an offset of zero. For practical purposes this means
+ that the structure can have at most one non bit-field element
+ and that this element must be the first one in the structure. */
+
+ /* Find the first field, ignoring non FIELD_DECL things which will
+ have been created by C++. */
+ for (field = TYPE_FIELDS (type);
+ field && TREE_CODE (field) != FIELD_DECL;
+ field = TREE_CHAIN (field))
+ continue;
+
+ if (field == NULL)
+ return 0; /* An empty structure. Allowed by an extension to ANSI C. */
+
+ /* Check that the first field is valid for returning in a register. */
+
+ /* ... Floats are not allowed */
+ if (FLOAT_TYPE_P (TREE_TYPE (field)))
+ return 1;
+
+ /* ... Aggregates that are not themselves valid for returning in
+ a register are not allowed. */
+ if (RETURN_IN_MEMORY (TREE_TYPE (field)))
+ return 1;
+
+ /* Now check the remaining fields, if any. Only bitfields are allowed,
+ since they are not addressable. */
+ for (field = TREE_CHAIN (field);
+ field;
+ field = TREE_CHAIN (field))
+ {
+ if (TREE_CODE (field) != FIELD_DECL)
+ continue;
+
+ if (! DECL_BIT_FIELD_TYPE (field))
+ return 1;
+ }
return 0;
}
- else if (TREE_CODE (type) == UNION_TYPE)
+
+ if (TREE_CODE (type) == UNION_TYPE)
{
tree field;
/* Unions can be returned in registers if every element is
integral, or can be returned in an integer register. */
- for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
+ for (field = TYPE_FIELDS (type);
+ field;
+ field = TREE_CHAIN (field))
{
- if (TREE_CODE (field) != FIELD_DECL
- || (AGGREGATE_TYPE_P (TREE_TYPE (field))
- && RETURN_IN_MEMORY (TREE_TYPE (field)))
- || FLOAT_TYPE_P (TREE_TYPE (field)))
+ if (TREE_CODE (field) != FIELD_DECL)
+ continue;
+
+ if (FLOAT_TYPE_P (TREE_TYPE (field)))
+ return 1;
+
+ if (RETURN_IN_MEMORY (TREE_TYPE (field)))
return 1;
}
+
return 0;
}
- /* XXX Not sure what should be done for other aggregates, so put them in
- memory. */
+#endif /* not ARM_WINCE */
+
+ /* Return all other types in memory. */
return 1;
}
-int
-legitimate_pic_operand_p (x)
- rtx x;
+/* Initialize a variable CUM of type CUMULATIVE_ARGS
+ for a call to a function whose data type is FNTYPE.
+ For a library call, FNTYPE is NULL. */
+void
+arm_init_cumulative_args (pcum, fntype, libname, indirect)
+ CUMULATIVE_ARGS * pcum;
+ tree fntype;
+ rtx libname ATTRIBUTE_UNUSED;
+ int indirect ATTRIBUTE_UNUSED;
{
- if (CONSTANT_P (x) && flag_pic
- && (GET_CODE (x) == SYMBOL_REF
- || (GET_CODE (x) == CONST
- && GET_CODE (XEXP (x, 0)) == PLUS
- && GET_CODE (XEXP (XEXP (x, 0), 0)) == SYMBOL_REF)))
- return 0;
+ /* On the ARM, the offset starts at 0. */
+ pcum->nregs = ((fntype && aggregate_value_p (TREE_TYPE (fntype))) ? 1 : 0);
+
+ pcum->call_cookie = CALL_NORMAL;
- return 1;
+ if (TARGET_LONG_CALLS)
+ pcum->call_cookie = CALL_LONG;
+
+ /* Check for long call/short call attributes. The attributes
+ override any command line option. */
+ if (fntype)
+ {
+ if (lookup_attribute ("short_call", TYPE_ATTRIBUTES (fntype)))
+ pcum->call_cookie = CALL_SHORT;
+ else if (lookup_attribute ("long_call", TYPE_ATTRIBUTES (fntype)))
+ pcum->call_cookie = CALL_LONG;
+ }
}
+/* Determine where to put an argument to a function.
+ Value is zero to push the argument on the stack,
+ or a hard register in which to store the argument.
+
+ MODE is the argument's machine mode.
+ TYPE is the data type of the argument (as a tree).
+ This is null for libcalls where that information may
+ not be available.
+ CUM is a variable of type CUMULATIVE_ARGS which gives info about
+ the preceding args and about the function being called.
+ NAMED is nonzero if this argument is a named parameter
+ (otherwise it is an extra parameter matching an ellipsis). */
rtx
-legitimize_pic_address (orig, mode, reg)
- rtx orig;
+arm_function_arg (pcum, mode, type, named)
+ CUMULATIVE_ARGS * pcum;
enum machine_mode mode;
- rtx reg;
+ tree type ATTRIBUTE_UNUSED;
+ int named;
{
- if (GET_CODE (orig) == SYMBOL_REF)
- {
- rtx pic_ref, address;
- rtx insn;
- int subregs = 0;
+ if (mode == VOIDmode)
+ /* Compute operand 2 of the call insn. */
+ return GEN_INT (pcum->call_cookie);
+
+ if (! named || pcum->nregs >= NUM_ARG_REGS)
+ return NULL_RTX;
+
+ return gen_rtx_REG (mode, pcum->nregs);
+}
+\f
+/* Encode the current state of the #pragma [no_]long_calls. */
+typedef enum
+{
+ OFF, /* No #pramgma [no_]long_calls is in effect. */
+ LONG, /* #pragma long_calls is in effect. */
+ SHORT /* #pragma no_long_calls is in effect. */
+} arm_pragma_enum;
- if (reg == 0)
+static arm_pragma_enum arm_pragma_long_calls = OFF;
+
+/* Handle pragmas for compatibility with Intel's compilers.
+ FIXME: This is incomplete, since it does not handle all
+ the pragmas that the Intel compilers understand. */
+int
+arm_process_pragma (p_getc, p_ungetc, pname)
+ int (* p_getc) PARAMS ((void)) ATTRIBUTE_UNUSED;
+ void (* p_ungetc) PARAMS ((int)) ATTRIBUTE_UNUSED;
+ char * pname;
+{
+ /* Should be pragma 'far' or equivalent for callx/balx here. */
+ if (strcmp (pname, "long_calls") == 0)
+ arm_pragma_long_calls = LONG;
+ else if (strcmp (pname, "no_long_calls") == 0)
+ arm_pragma_long_calls = SHORT;
+ else if (strcmp (pname, "long_calls_off") == 0)
+ arm_pragma_long_calls = OFF;
+ else
+ return 0;
+
+ return 1;
+}
+\f
+/* Return nonzero if IDENTIFIER with arguments ARGS is a valid machine specific
+ attribute for TYPE. The attributes in ATTRIBUTES have previously been
+ assigned to TYPE. */
+int
+arm_valid_type_attribute_p (type, attributes, identifier, args)
+ tree type;
+ tree attributes ATTRIBUTE_UNUSED;
+ tree identifier;
+ tree args;
+{
+ if ( TREE_CODE (type) != FUNCTION_TYPE
+ && TREE_CODE (type) != METHOD_TYPE
+ && TREE_CODE (type) != FIELD_DECL
+ && TREE_CODE (type) != TYPE_DECL)
+ return 0;
+
+ /* Function calls made to this symbol must be done indirectly, because
+ it may lie outside of the 26 bit addressing range of a normal function
+ call. */
+ if (is_attribute_p ("long_call", identifier))
+ return (args == NULL_TREE);
+
+ /* Whereas these functions are always known to reside within the 26 bit
+ addressing range. */
+ if (is_attribute_p ("short_call", identifier))
+ return (args == NULL_TREE);
+
+ return 0;
+}
+
+/* Return 0 if the attributes for two types are incompatible, 1 if they
+ are compatible, and 2 if they are nearly compatible (which causes a
+ warning to be generated). */
+int
+arm_comp_type_attributes (type1, type2)
+ tree type1;
+ tree type2;
+{
+ int l1, l2, s1, s2;
+
+ /* Check for mismatch of non-default calling convention. */
+ if (TREE_CODE (type1) != FUNCTION_TYPE)
+ return 1;
+
+ /* Check for mismatched call attributes. */
+ l1 = lookup_attribute ("long_call", TYPE_ATTRIBUTES (type1)) != NULL;
+ l2 = lookup_attribute ("long_call", TYPE_ATTRIBUTES (type2)) != NULL;
+ s1 = lookup_attribute ("short_call", TYPE_ATTRIBUTES (type1)) != NULL;
+ s2 = lookup_attribute ("short_call", TYPE_ATTRIBUTES (type2)) != NULL;
+
+ /* Only bother to check if an attribute is defined. */
+ if (l1 | l2 | s1 | s2)
+ {
+ /* If one type has an attribute, the other must have the same attribute. */
+ if ((l1 != l2) || (s1 != s2))
+ return 0;
+
+ /* Disallow mixed attributes. */
+ if ((l1 & s2) || (l2 & s1))
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Encode long_call or short_call attribute by prefixing
+ symbol name in DECL with a special character FLAG. */
+void
+arm_encode_call_attribute (decl, flag)
+ tree decl;
+ char flag;
+{
+ const char * str = XSTR (XEXP (DECL_RTL (decl), 0), 0);
+ int len = strlen (str);
+ char * newstr;
+
+ if (TREE_CODE (decl) != FUNCTION_DECL)
+ return;
+
+ /* Do not allow weak functions to be treated as short call. */
+ if (DECL_WEAK (decl) && flag == SHORT_CALL_FLAG_CHAR)
+ return;
+
+ if (ggc_p)
+ newstr = ggc_alloc_string (NULL, len + 2);
+ else
+ newstr = permalloc (len + 2);
+
+ sprintf (newstr, "%c%s", flag, str);
+
+ XSTR (XEXP (DECL_RTL (decl), 0), 0) = newstr;
+}
+
+/* Assigns default attributes to newly defined type. This is used to
+ set short_call/long_call attributes for function types of
+ functions defined inside corresponding #pragma scopes. */
+void
+arm_set_default_type_attributes (type)
+ tree type;
+{
+ /* Add __attribute__ ((long_call)) to all functions, when
+ inside #pragma long_calls or __attribute__ ((short_call)),
+ when inside #pragma no_long_calls. */
+ if (TREE_CODE (type) == FUNCTION_TYPE || TREE_CODE (type) == METHOD_TYPE)
+ {
+ tree type_attr_list, attr_name;
+ type_attr_list = TYPE_ATTRIBUTES (type);
+
+ if (arm_pragma_long_calls == LONG)
+ attr_name = get_identifier ("long_call");
+ else if (arm_pragma_long_calls == SHORT)
+ attr_name = get_identifier ("short_call");
+ else
+ return;
+
+ type_attr_list = tree_cons (attr_name, NULL_TREE, type_attr_list);
+ TYPE_ATTRIBUTES (type) = type_attr_list;
+ }
+}
+\f
+/* Return 1 if the operand is a SYMBOL_REF for a function known to be
+ defined within the current compilation unit. If this caanot be
+ determined, then 0 is returned. */
+static int
+current_file_function_operand (sym_ref)
+ rtx sym_ref;
+{
+ /* This is a bit of a fib. A function will have a short call flag
+ applied to its name if it has the short call attribute, or it has
+ already been defined within the current compilation unit. */
+ if (ENCODED_SHORT_CALL_ATTR_P (XSTR (sym_ref, 0)))
+ return 1;
+
+ /* The current funciton is always defined within the current compilation
+ unit. if it s a weak defintion however, then this may not be the real
+ defintion of the function, and so we have to say no. */
+ if (sym_ref == XEXP (DECL_RTL (current_function_decl), 0)
+ && ! DECL_WEAK (current_function_decl))
+ return 1;
+
+ /* We cannot make the determination - default to returning 0. */
+ return 0;
+}
+
+/* Return non-zero if a 32 bit "long_call" should be generated for
+ this call. We generate a long_call if the function:
+
+ a. has an __attribute__((long call))
+ or b. is within the scope of a #pragma long_calls
+ or c. the -mlong-calls command line switch has been specified
+
+ However we do not generate a long call if the function:
+
+ d. has an __attribute__ ((short_call))
+ or e. is inside the scope of a #pragma no_long_calls
+ or f. has an __attribute__ ((section))
+ or g. is defined within the current compilation unit.
+
+ This function will be called by C fragments contained in the machine
+ description file. CALL_REF and CALL_COOKIE correspond to the matched
+ rtl operands. CALL_SYMBOL is used to distinguish between
+ two different callers of the function. It is set to 1 in the
+ "call_symbol" and "call_symbol_value" patterns and to 0 in the "call"
+ and "call_value" patterns. This is because of the difference in the
+ SYM_REFs passed by these patterns. */
+int
+arm_is_longcall_p (sym_ref, call_cookie, call_symbol)
+ rtx sym_ref;
+ int call_cookie;
+ int call_symbol;
+{
+ if (! call_symbol)
+ {
+ if (GET_CODE (sym_ref) != MEM)
+ return 0;
+
+ sym_ref = XEXP (sym_ref, 0);
+ }
+
+ if (GET_CODE (sym_ref) != SYMBOL_REF)
+ return 0;
+
+ if (call_cookie & CALL_SHORT)
+ return 0;
+
+ if (TARGET_LONG_CALLS && flag_function_sections)
+ return 1;
+
+ if (current_file_function_operand (sym_ref, VOIDmode))
+ return 0;
+
+ return (call_cookie & CALL_LONG)
+ || ENCODED_LONG_CALL_ATTR_P (XSTR (sym_ref, 0))
+ || TARGET_LONG_CALLS;
+}
+\f
+int
+legitimate_pic_operand_p (x)
+ rtx x;
+{
+ if (CONSTANT_P (x)
+ && flag_pic
+ && (GET_CODE (x) == SYMBOL_REF
+ || (GET_CODE (x) == CONST
+ && GET_CODE (XEXP (x, 0)) == PLUS
+ && GET_CODE (XEXP (XEXP (x, 0), 0)) == SYMBOL_REF)))
+ return 0;
+
+ return 1;
+}
+
+rtx
+legitimize_pic_address (orig, mode, reg)
+ rtx orig;
+ enum machine_mode mode;
+ rtx reg;
+{
+ if (GET_CODE (orig) == SYMBOL_REF)
+ {
+ rtx pic_ref, address;
+ rtx insn;
+ int subregs = 0;
+
+ if (reg == 0)
{
if (reload_in_progress || reload_completed)
abort ();
#ifdef AOF_ASSEMBLER
/* The AOF assembler can generate relocations for these directly, and
- understands that the PIC register has to be added into the offset.
- */
+ understands that the PIC register has to be added into the offset. */
insn = emit_insn (gen_pic_load_addr_based (reg, orig));
#else
if (subregs)
emit_insn (gen_pic_load_addr (address, orig));
- pic_ref = gen_rtx (MEM, Pmode,
- gen_rtx (PLUS, Pmode, pic_offset_table_rtx, address));
+ pic_ref = gen_rtx_MEM (Pmode,
+ gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
+ address));
RTX_UNCHANGING_P (pic_ref) = 1;
insn = emit_move_insn (reg, pic_ref);
#endif
current_function_uses_pic_offset_table = 1;
/* Put a REG_EQUAL note on this insn, so that it can be optimized
by loop. */
- REG_NOTES (insn) = gen_rtx (EXPR_LIST, REG_EQUAL, orig,
- REG_NOTES (insn));
+ REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, orig,
+ REG_NOTES (insn));
return reg;
}
else if (GET_CODE (orig) == CONST)
return reg;
}
- return gen_rtx (PLUS, Pmode, base, offset);
+ return gen_rtx_PLUS (Pmode, base, offset);
}
else if (GET_CODE (orig) == LABEL_REF)
- current_function_uses_pic_offset_table = 1;
+ {
+ current_function_uses_pic_offset_table = 1;
+
+ if (NEED_GOT_RELOC)
+ {
+ rtx pic_ref, address = gen_reg_rtx (Pmode);
+
+ emit_insn (gen_pic_load_addr (address, orig));
+ pic_ref = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, address);
+
+ emit_move_insn (address, pic_ref);
+ return address;
+ }
+ }
return orig;
}
static rtx pic_rtx;
int
-is_pic(x)
+is_pic (x)
rtx x;
{
if (x == pic_rtx)
rtx l1, pic_tmp, pic_tmp2, seq;
rtx global_offset_table;
- if (current_function_uses_pic_offset_table == 0)
+ if (current_function_uses_pic_offset_table == 0 || TARGET_SINGLE_PIC_BASE)
return;
if (! flag_pic)
start_sequence ();
l1 = gen_label_rtx ();
- global_offset_table = gen_rtx (SYMBOL_REF, Pmode, "_GLOBAL_OFFSET_TABLE_");
- pic_tmp = gen_rtx (CONST, VOIDmode,
- gen_rtx (PLUS, Pmode,
- gen_rtx (LABEL_REF, VOIDmode, l1),
- GEN_INT (8)));
- pic_tmp2 = gen_rtx (CONST, VOIDmode,
- gen_rtx (PLUS, Pmode,
- global_offset_table,
- pc_rtx));
-
- pic_rtx = gen_rtx (CONST, Pmode,
- gen_rtx (MINUS, Pmode, pic_tmp2, pic_tmp));
+ global_offset_table = gen_rtx_SYMBOL_REF (Pmode, "_GLOBAL_OFFSET_TABLE_");
+ /* On the ARM the PC register contains 'dot + 8' at the time of the
+ addition, on the Thumb it is 'dot + 4'. */
+ pic_tmp = plus_constant (gen_rtx_LABEL_REF (Pmode, l1), TARGET_ARM ? 8 : 4);
+ if (GOT_PCREL)
+ pic_tmp2 = gen_rtx_CONST (VOIDmode,
+ gen_rtx_PLUS (Pmode, global_offset_table, pc_rtx));
+ else
+ pic_tmp2 = gen_rtx_CONST (VOIDmode, global_offset_table);
+ pic_rtx = gen_rtx_CONST (Pmode, gen_rtx_MINUS (Pmode, pic_tmp2, pic_tmp));
+
emit_insn (gen_pic_load_addr (pic_offset_table_rtx, pic_rtx));
- emit_jump_insn (gen_pic_add_dot_plus_eight(l1, pic_offset_table_rtx));
- emit_label (l1);
+ if (TARGET_ARM)
+ emit_insn (gen_pic_add_dot_plus_eight (pic_offset_table_rtx, l1));
+ else
+ emit_insn (gen_pic_add_dot_plus_four (pic_offset_table_rtx, l1));
seq = gen_sequence ();
end_sequence ();
/* Need to emit this whether or not we obey regdecls,
since setjmp/longjmp can cause life info to screw up. */
- emit_insn (gen_rtx (USE, VOIDmode, pic_offset_table_rtx));
+ emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx));
#endif /* AOF_ASSEMBLER */
}
#define REG_OR_SUBREG_RTX(X) \
(GET_CODE (X) == REG ? (X) : SUBREG_REG (X))
-#define ARM_FRAME_RTX(X) \
- ((X) == frame_pointer_rtx || (X) == stack_pointer_rtx \
- || (X) == arg_pointer_rtx)
+#ifndef COSTS_N_INSNS
+#define COSTS_N_INSNS(N) ((N) * 4 - 2)
+#endif
int
-arm_rtx_costs (x, code, outer_code)
+arm_rtx_costs (x, code, outer)
rtx x;
- enum rtx_code code, outer_code;
+ enum rtx_code code;
+ enum rtx_code outer;
{
enum machine_mode mode = GET_MODE (x);
enum rtx_code subcode;
int extra_cost;
+ if (TARGET_THUMB)
+ {
+ switch (code)
+ {
+ case ASHIFT:
+ case ASHIFTRT:
+ case LSHIFTRT:
+ case ROTATERT:
+ case PLUS:
+ case MINUS:
+ case COMPARE:
+ case NEG:
+ case NOT:
+ return COSTS_N_INSNS (1);
+
+ case MULT:
+ if (GET_CODE (XEXP (x, 1)) == CONST_INT)
+ {
+ int cycles = 0;
+ unsigned HOST_WIDE_INT i = INTVAL (XEXP (x, 1));
+
+ while (i)
+ {
+ i >>= 2;
+ cycles ++;
+ }
+ return COSTS_N_INSNS (2) + cycles;
+ }
+ return COSTS_N_INSNS (1) + 16;
+
+ case SET:
+ return (COSTS_N_INSNS (1)
+ + 4 * ((GET_CODE (SET_SRC (x)) == MEM)
+ + GET_CODE (SET_DEST (x)) == MEM));
+
+ case CONST_INT:
+ if (outer == SET)
+ {
+ if ((unsigned HOST_WIDE_INT) INTVAL (x) < 256)
+ return 0;
+ if (thumb_shiftable_const (INTVAL (x)))
+ return COSTS_N_INSNS (2);
+ return COSTS_N_INSNS (3);
+ }
+ else if (outer == PLUS
+ && INTVAL (x) < 256 && INTVAL (x) > -256)
+ return 0;
+ else if (outer == COMPARE
+ && (unsigned HOST_WIDE_INT) INTVAL (x) < 256)
+ return 0;
+ else if (outer == ASHIFT || outer == ASHIFTRT
+ || outer == LSHIFTRT)
+ return 0;
+ return COSTS_N_INSNS (2);
+
+ case CONST:
+ case CONST_DOUBLE:
+ case LABEL_REF:
+ case SYMBOL_REF:
+ return COSTS_N_INSNS (3);
+
+ case UDIV:
+ case UMOD:
+ case DIV:
+ case MOD:
+ return 100;
+
+ case TRUNCATE:
+ return 99;
+
+ case AND:
+ case XOR:
+ case IOR:
+ /* XXX guess. */
+ return 8;
+
+ case ADDRESSOF:
+ case MEM:
+ /* XXX another guess. */
+ /* Memory costs quite a lot for the first word, but subsequent words
+ load at the equivalent of a single insn each. */
+ return (10 + 4 * ((GET_MODE_SIZE (mode) - 1) / UNITS_PER_WORD)
+ + (CONSTANT_POOL_ADDRESS_P (x) ? 4 : 0));
+
+ case IF_THEN_ELSE:
+ /* XXX a guess. */
+ if (GET_CODE (XEXP (x, 1)) == PC || GET_CODE (XEXP (x, 2)) == PC)
+ return 14;
+ return 2;
+
+ case ZERO_EXTEND:
+ /* XXX still guessing. */
+ switch (GET_MODE (XEXP (x, 0)))
+ {
+ case QImode:
+ return (1 + (mode == DImode ? 4 : 0)
+ + (GET_CODE (XEXP (x, 0)) == MEM ? 10 : 0));
+
+ case HImode:
+ return (4 + (mode == DImode ? 4 : 0)
+ + (GET_CODE (XEXP (x, 0)) == MEM ? 10 : 0));
+
+ case SImode:
+ return (1 + (GET_CODE (XEXP (x, 0)) == MEM ? 10 : 0));
+
+ default:
+ return 99;
+ }
+
+ default:
+ return 99;
+#if 0
+ case FFS:
+ case FLOAT:
+ case FIX:
+ case UNSIGNED_FIX:
+ /* XXX guess */
+ fprintf (stderr, "unexpected code for thumb in rtx_costs: %s\n",
+ rtx_name[code]);
+ abort ();
+#endif
+ }
+ }
+
switch (code)
{
case MEM:
return (4 + extra_cost + (REG_OR_SUBREG_REG (XEXP (x, 0)) ? 0 : 8)
+ ((REG_OR_SUBREG_REG (XEXP (x, 1))
|| (GET_CODE (XEXP (x, 1)) == CONST_INT
- && const_ok_for_op (INTVAL (XEXP (x, 1)), code, mode)))
+ && const_ok_for_op (INTVAL (XEXP (x, 1)), code)))
? 0 : 8));
if (REG_OR_SUBREG_REG (XEXP (x, 0)))
return (1 + (GET_CODE (XEXP (x, 1)) == CONST_INT ? 0 : extra_cost)
+ ((REG_OR_SUBREG_REG (XEXP (x, 1))
|| (GET_CODE (XEXP (x, 1)) == CONST_INT
- && const_ok_for_op (INTVAL (XEXP (x, 1)), code, mode)))
+ && const_ok_for_op (INTVAL (XEXP (x, 1)), code)))
? 0 : 4));
else if (REG_OR_SUBREG_REG (XEXP (x, 1)))
|| (subcode == MULT
&& GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT
&& ((INTVAL (XEXP (XEXP (x, 0), 1)) &
- (INTVAL (XEXP (XEXP (x, 0), 1)) - 1)) == 0))
+ (INTVAL (XEXP (XEXP (x, 0), 1)) - 1)) == 0)))
&& (REG_OR_SUBREG_REG (XEXP (XEXP (x, 0), 0)))
&& ((REG_OR_SUBREG_REG (XEXP (XEXP (x, 0), 1)))
- || GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)))
+ || GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT))
? 0 : 4));
return 8;
case MULT:
+ /* There is no point basing this on the tuning, since it is always the
+ fast variant if it exists at all. */
if (arm_fast_multiply && mode == DImode
&& (GET_CODE (XEXP (x, 0)) == GET_CODE (XEXP (x, 1)))
&& (GET_CODE (XEXP (x, 0)) == ZERO_EXTEND
if (GET_CODE (XEXP (x, 1)) == CONST_INT)
{
unsigned HOST_WIDE_INT i = (INTVAL (XEXP (x, 1))
- & (unsigned HOST_WIDE_INT) 0xffffffff);
+ & HOST_UINT (0xffffffff));
int add_cost = const_ok_for_arm (i) ? 4 : 8;
int j;
- int booth_unit_size = (arm_fast_multiply ? 8 : 2);
-
+
+ /* Tune as appropriate. */
+ int booth_unit_size = ((tune_flags & FL_FAST_MULT) ? 8 : 2);
+
for (j = 0; i && j < 32; j += booth_unit_size)
{
i >>= booth_unit_size;
return add_cost;
}
- return ((arm_fast_multiply ? 8 : 30)
+ return (((tune_flags & FL_FAST_MULT) ? 8 : 30)
+ (REG_OR_SUBREG_REG (XEXP (x, 0)) ? 0 : 4)
+ (REG_OR_SUBREG_REG (XEXP (x, 1)) ? 0 : 4));
+ case TRUNCATE:
+ if (arm_fast_multiply && mode == SImode
+ && GET_CODE (XEXP (x, 0)) == LSHIFTRT
+ && GET_CODE (XEXP (XEXP (x, 0), 0)) == MULT
+ && (GET_CODE (XEXP (XEXP (XEXP (x, 0), 0), 0))
+ == GET_CODE (XEXP (XEXP (XEXP (x, 0), 0), 1)))
+ && (GET_CODE (XEXP (XEXP (XEXP (x, 0), 0), 0)) == ZERO_EXTEND
+ || GET_CODE (XEXP (XEXP (XEXP (x, 0), 0), 0)) == SIGN_EXTEND))
+ return 8;
+ return 99;
+
case NEG:
if (GET_MODE_CLASS (mode) == MODE_FLOAT)
return 4 + (REG_OR_SUBREG_REG (XEXP (x, 0)) ? 0 : 6);
case SImode:
return (1 + (GET_CODE (XEXP (x, 0)) == MEM ? 10 : 0));
+
+ default:
+ break;
}
abort ();
+ case CONST_INT:
+ if (const_ok_for_arm (INTVAL (x)))
+ return outer == SET ? 2 : -1;
+ else if (outer == AND
+ && const_ok_for_arm (~ INTVAL (x)))
+ return -1;
+ else if ((outer == COMPARE
+ || outer == PLUS || outer == MINUS)
+ && const_ok_for_arm (- INTVAL (x)))
+ return -1;
+ else
+ return 5;
+
+ case CONST:
+ case LABEL_REF:
+ case SYMBOL_REF:
+ return 6;
+
+ case CONST_DOUBLE:
+ if (const_double_rtx_ok_for_fpu (x))
+ return outer == SET ? 2 : -1;
+ else if ((outer == COMPARE || outer == PLUS)
+ && neg_const_double_rtx_ok_for_fpu (x))
+ return -1;
+ return 7;
+
default:
return 99;
}
{
rtx i_pat, d_pat;
+ /* XXX This is not strictly true for the FPA. */
+ if (REG_NOTE_KIND (link) == REG_DEP_ANTI
+ || REG_NOTE_KIND (link) == REG_DEP_OUTPUT)
+ return 0;
+
+ /* Call insns don't incur a stall, even if they follow a load. */
+ if (REG_NOTE_KIND (link) == 0
+ && GET_CODE (insn) == CALL_INSN)
+ return 1;
+
if ((i_pat = single_set (insn)) != NULL
&& GET_CODE (SET_SRC (i_pat)) == MEM
&& (d_pat = single_set (dep)) != NULL
/* This is a load after a store, there is no conflict if the load reads
from a cached area. Assume that loads from the stack, and from the
constant pool are cached, and that others will miss. This is a
- hack. */
+ hack. */
-/* debug_rtx (insn);
- debug_rtx (dep);
- debug_rtx (link);
- fprintf (stderr, "costs %d\n", cost); */
-
if (CONSTANT_POOL_ADDRESS_P (XEXP (SET_SRC (i_pat), 0))
|| reg_mentioned_p (stack_pointer_rtx, XEXP (SET_SRC (i_pat), 0))
|| reg_mentioned_p (frame_pointer_rtx, XEXP (SET_SRC (i_pat), 0))
|| reg_mentioned_p (hard_frame_pointer_rtx,
XEXP (SET_SRC (i_pat), 0)))
- {
-/* fprintf (stderr, "***** Now 1\n"); */
- return 1;
- }
+ return 1;
}
return cost;
}
-/* This code has been fixed for cross compilation. */
+/* This code has been fixed for cross compilation. */
static int fpa_consts_inited = 0;
-char *strings_fpa[8] = {
+char * strings_fpa[8] =
+{
"0", "1", "2", "3",
"4", "5", "0.5", "10"
};
fpa_consts_inited = 1;
}
-/* Return TRUE if rtx X is a valid immediate FPU constant. */
+/* Return TRUE if rtx X is a valid immediate FPU constant. */
int
const_double_rtx_ok_for_fpu (x)
return 0;
}
-/* Return TRUE if rtx X is a valid immediate FPU constant. */
+/* Return TRUE if rtx X is a valid immediate FPU constant. */
int
neg_const_double_rtx_ok_for_fpu (x)
/* We don't consider registers whose class is NO_REGS
to be a register operand. */
+ /* XXX might have to check for lo regs only for thumb ??? */
return (GET_CODE (op) == REG
&& (REGNO (op) >= FIRST_PSEUDO_REGISTER
|| REGNO_REG_CLASS (REGNO (op)) != NO_REGS));
/* Return 1 if OP is an item in memory, given that we are in reload. */
int
-reload_memory_operand (op, mode)
+arm_reload_memory_operand (op, mode)
rtx op;
- enum machine_mode mode;
+ enum machine_mode mode ATTRIBUTE_UNUSED;
{
int regno = true_regnum (op);
&& REGNO (op) >= FIRST_PSEUDO_REGISTER)));
}
+/* Return 1 if OP is a valid memory address, but not valid for a signed byte
+ memory access (architecture V4).
+ MODE is QImode if called when computing contraints, or VOIDmode when
+ emitting patterns. In this latter case we cannot use memory_operand()
+ because it will fail on badly formed MEMs, which is precisly what we are
+ trying to catch. */
+int
+bad_signed_byte_operand (op, mode)
+ rtx op;
+ enum machine_mode mode ATTRIBUTE_UNUSED;
+{
+#if 0
+ if ((mode == QImode && ! memory_operand (op, mode)) || GET_CODE (op) != MEM)
+ return 0;
+#endif
+ if (GET_CODE (op) != MEM)
+ return 0;
+
+ op = XEXP (op, 0);
+
+ /* A sum of anything more complex than reg + reg or reg + const is bad. */
+ if ((GET_CODE (op) == PLUS || GET_CODE (op) == MINUS)
+ && (! s_register_operand (XEXP (op, 0), VOIDmode)
+ || (! s_register_operand (XEXP (op, 1), VOIDmode)
+ && GET_CODE (XEXP (op, 1)) != CONST_INT)))
+ return 1;
+
+ /* Big constants are also bad. */
+ if (GET_CODE (op) == PLUS && GET_CODE (XEXP (op, 1)) == CONST_INT
+ && (INTVAL (XEXP (op, 1)) > 0xff
+ || -INTVAL (XEXP (op, 1)) > 0xff))
+ return 1;
+
+ /* Everything else is good, or can will automatically be made so. */
+ return 0;
+}
+
/* Return TRUE for valid operands for the rhs of an ARM instruction. */
int
rtx op;
enum machine_mode mode;
{
+ if (TARGET_THUMB)
+ return thumb_cmp_operand (op, mode);
+
return (s_register_operand (op, mode)
|| (GET_CODE (op) == CONST_INT
&& (const_ok_for_arm (INTVAL (op))
&& (GET_CODE (reg = XEXP (op, 0)) == REG
|| (GET_CODE (XEXP (op, 0)) == SUBREG
&& GET_CODE (reg = SUBREG_REG (XEXP (op, 0))) == REG))))
- && REGNO_POINTER_ALIGN (REGNO (reg)) >= 4);
+ && REGNO_POINTER_ALIGN (REGNO (reg)) >= 32);
+}
+
+/* Similar to s_register_operand, but does not allow hard integer
+ registers. */
+int
+f_register_operand (op, mode)
+ register rtx op;
+ enum machine_mode mode;
+{
+ if (GET_MODE (op) != mode && mode != VOIDmode)
+ return 0;
+
+ if (GET_CODE (op) == SUBREG)
+ op = SUBREG_REG (op);
+
+ /* We don't consider registers whose class is NO_REGS
+ to be a register operand. */
+ return (GET_CODE (op) == REG
+ && (REGNO (op) >= FIRST_PSEUDO_REGISTER
+ || REGNO_REG_CLASS (REGNO (op)) == FPU_REGS));
}
/* Return TRUE for valid operands for the rhs of an FPU instruction. */
{
if (s_register_operand (op, mode))
return TRUE;
- else if (GET_CODE (op) == CONST_DOUBLE)
- return (const_double_rtx_ok_for_fpu (op));
+
+ if (GET_MODE (op) != mode && mode != VOIDmode)
+ return FALSE;
+
+ if (GET_CODE (op) == CONST_DOUBLE)
+ return const_double_rtx_ok_for_fpu (op);
return FALSE;
}
{
if (s_register_operand (op, mode))
return TRUE;
- else if (GET_CODE (op) == CONST_DOUBLE)
+
+ if (GET_MODE (op) != mode && mode != VOIDmode)
+ return FALSE;
+
+ if (GET_CODE (op) == CONST_DOUBLE)
return (const_double_rtx_ok_for_fpu (op)
|| neg_const_double_rtx_ok_for_fpu (op));
int
power_of_two_operand (op, mode)
rtx op;
- enum machine_mode mode;
+ enum machine_mode mode ATTRIBUTE_UNUSED;
{
if (GET_CODE (op) == CONST_INT)
{
- HOST_WIDE_INT value = INTVAL(op);
+ HOST_WIDE_INT value = INTVAL (op);
return value != 0 && (value & (value - 1)) == 0;
}
return FALSE;
}
/* Return TRUE for a valid operand of a DImode operation.
- Either: REG, CONST_DOUBLE or MEM(DImode_address).
+ Either: REG, SUBREG, CONST_DOUBLE or MEM(DImode_address).
Note that this disallows MEM(REG+REG), but allows
MEM(PRE/POST_INC/DEC(REG)). */
if (s_register_operand (op, mode))
return TRUE;
+ if (mode != VOIDmode && GET_MODE (op) != VOIDmode && GET_MODE (op) != DImode)
+ return FALSE;
+
+ if (GET_CODE (op) == SUBREG)
+ op = SUBREG_REG (op);
+
switch (GET_CODE (op))
{
case CONST_DOUBLE:
}
}
+/* Like di_operand, but don't accept constants. */
+int
+nonimmediate_di_operand (op, mode)
+ rtx op;
+ enum machine_mode mode;
+{
+ if (s_register_operand (op, mode))
+ return TRUE;
+
+ if (mode != VOIDmode && GET_MODE (op) != VOIDmode && GET_MODE (op) != DImode)
+ return FALSE;
+
+ if (GET_CODE (op) == SUBREG)
+ op = SUBREG_REG (op);
+
+ if (GET_CODE (op) == MEM)
+ return memory_address_p (DImode, XEXP (op, 0));
+
+ return FALSE;
+}
+
/* Return TRUE for a valid operand of a DFmode operation when -msoft-float.
- Either: REG, CONST_DOUBLE or MEM(DImode_address).
+ Either: REG, SUBREG, CONST_DOUBLE or MEM(DImode_address).
Note that this disallows MEM(REG+REG), but allows
MEM(PRE/POST_INC/DEC(REG)). */
if (s_register_operand (op, mode))
return TRUE;
+ if (mode != VOIDmode && GET_MODE (op) != mode)
+ return FALSE;
+
+ if (GET_CODE (op) == SUBREG && CONSTANT_P (SUBREG_REG (op)))
+ return FALSE;
+
+ if (GET_CODE (op) == SUBREG)
+ op = SUBREG_REG (op);
+
switch (GET_CODE (op))
{
case CONST_DOUBLE:
}
}
-/* Return TRUE for valid index operands. */
-
+/* Like soft_df_operand, but don't accept constants. */
int
-index_operand (op, mode)
+nonimmediate_soft_df_operand (op, mode)
rtx op;
enum machine_mode mode;
{
- return (s_register_operand(op, mode)
- || (immediate_operand (op, mode)
- && INTVAL (op) < 4096 && INTVAL (op) > -4096));
-}
+ if (s_register_operand (op, mode))
+ return TRUE;
-/* Return TRUE for valid shifts by a constant. This also accepts any
- power of two on the (somewhat overly relaxed) assumption that the
- shift operator in this case was a mult. */
+ if (mode != VOIDmode && GET_MODE (op) != mode)
+ return FALSE;
-int
+ if (GET_CODE (op) == SUBREG)
+ op = SUBREG_REG (op);
+
+ if (GET_CODE (op) == MEM)
+ return memory_address_p (DFmode, XEXP (op, 0));
+ return FALSE;
+}
+
+/* Return TRUE for valid index operands. */
+int
+index_operand (op, mode)
+ rtx op;
+ enum machine_mode mode;
+{
+ return (s_register_operand (op, mode)
+ || (immediate_operand (op, mode)
+ && (GET_CODE (op) != CONST_INT
+ || (INTVAL (op) < 4096 && INTVAL (op) > -4096))));
+}
+
+/* Return TRUE for valid shifts by a constant. This also accepts any
+ power of two on the (somewhat overly relaxed) assumption that the
+ shift operator in this case was a mult. */
+
+int
const_shift_operand (op, mode)
rtx op;
enum machine_mode mode;
{
return (power_of_two_operand (op, mode)
|| (immediate_operand (op, mode)
- && (INTVAL (op) < 32 && INTVAL (op) > 0)));
+ && (GET_CODE (op) != CONST_INT
+ || (INTVAL (op) < 32 && INTVAL (op) > 0))));
}
/* Return TRUE for arithmetic operators which can be combined with a multiply
}
}
-/* Return TRUE for shift operators. */
+/* Return TRUE for binary logical operators. */
+
+int
+logical_binary_operator (x, mode)
+ rtx x;
+ enum machine_mode mode;
+{
+ if (GET_MODE (x) != mode)
+ return FALSE;
+ else
+ {
+ enum rtx_code code = GET_CODE (x);
+
+ return (code == IOR || code == XOR || code == AND);
+ }
+}
+
+/* Return TRUE for shift operators. */
int
shift_operator (x, mode)
enum rtx_code code = GET_CODE (x);
if (code == MULT)
- return power_of_two_operand (XEXP (x, 1));
+ return power_of_two_operand (XEXP (x, 1), mode);
return (code == ASHIFT || code == ASHIFTRT || code == LSHIFTRT
|| code == ROTATERT);
}
}
-int equality_operator (x, mode)
+/* Return TRUE if x is EQ or NE. */
+int
+equality_operator (x, mode)
rtx x;
- enum machine_mode mode;
+ enum machine_mode mode ATTRIBUTE_UNUSED;
{
return GET_CODE (x) == EQ || GET_CODE (x) == NE;
}
-/* Return TRUE for SMIN SMAX UMIN UMAX operators. */
-
+/* Return TRUE for SMIN SMAX UMIN UMAX operators. */
int
minmax_operator (x, mode)
rtx x;
return code == SMIN || code == SMAX || code == UMIN || code == UMAX;
}
-/* return TRUE if x is EQ or NE */
-
/* Return TRUE if this is the condition code register, if we aren't given
- a mode, accept any class CCmode register */
-
+ a mode, accept any class CCmode register. */
int
cc_register (x, mode)
rtx x;
if (mode == VOIDmode)
{
mode = GET_MODE (x);
+
if (GET_MODE_CLASS (mode) != MODE_CC)
return FALSE;
}
- if (mode == GET_MODE (x) && GET_CODE (x) == REG && REGNO (x) == 24)
+ if ( GET_MODE (x) == mode
+ && GET_CODE (x) == REG
+ && REGNO (x) == CC_REGNUM)
return TRUE;
return FALSE;
/* Return TRUE if this is the condition code register, if we aren't given
a mode, accept any class CCmode register which indicates a dominance
expression. */
-
int
dominant_cc_register (x, mode)
rtx x;
if (mode == VOIDmode)
{
mode = GET_MODE (x);
+
if (GET_MODE_CLASS (mode) != MODE_CC)
return FALSE;
}
- if (mode != CC_DNEmode && mode != CC_DEQmode
+ if ( mode != CC_DNEmode && mode != CC_DEQmode
&& mode != CC_DLEmode && mode != CC_DLTmode
&& mode != CC_DGEmode && mode != CC_DGTmode
&& mode != CC_DLEUmode && mode != CC_DLTUmode
&& mode != CC_DGEUmode && mode != CC_DGTUmode)
return FALSE;
- if (mode == GET_MODE (x) && GET_CODE (x) == REG && REGNO (x) == 24)
- return TRUE;
-
- return FALSE;
+ return cc_register (x, mode);
}
/* Return TRUE if X references a SYMBOL_REF. */
symbol_mentioned_p (x)
rtx x;
{
- register char *fmt;
+ register const char * fmt;
register int i;
if (GET_CODE (x) == SYMBOL_REF)
return 1;
fmt = GET_RTX_FORMAT (GET_CODE (x));
+
for (i = GET_RTX_LENGTH (GET_CODE (x)) - 1; i >= 0; i--)
{
if (fmt[i] == 'E')
label_mentioned_p (x)
rtx x;
{
- register char *fmt;
+ register const char * fmt;
register int i;
if (GET_CODE (x) == LABEL_REF)
abort ();
}
-/* Return 1 if memory locations are adjacent */
-
+/* Return 1 if memory locations are adjacent. */
int
adjacent_mem_locations (a, b)
rtx a, b;
}
/* Return 1 if OP is a load multiple operation. It is known to be
- parallel and the first section will be tested. */
-
+ parallel and the first section will be tested. */
int
load_multiple_operation (op, mode)
rtx op;
- enum machine_mode mode;
+ enum machine_mode mode ATTRIBUTE_UNUSED;
{
HOST_WIDE_INT count = XVECLEN (op, 0);
int dest_regno;
|| GET_CODE (XVECEXP (op, 0, 0)) != SET)
return 0;
- /* Check to see if this might be a write-back */
+ /* Check to see if this might be a write-back. */
if (GET_CODE (SET_SRC (elt = XVECEXP (op, 0, 0))) == PLUS)
{
i++;
base = 1;
- /* Now check it more carefully */
+ /* Now check it more carefully. */
if (GET_CODE (SET_DEST (elt)) != REG
|| GET_CODE (XEXP (SET_SRC (elt), 0)) != REG
|| REGNO (XEXP (SET_SRC (elt), 0)) != REGNO (SET_DEST (elt))
for (; i < count; i++)
{
- rtx elt = XVECEXP (op, 0, i);
+ elt = XVECEXP (op, 0, i);
if (GET_CODE (elt) != SET
|| GET_CODE (SET_DEST (elt)) != REG
|| GET_MODE (SET_DEST (elt)) != SImode
- || REGNO (SET_DEST (elt)) != dest_regno + i - base
+ || REGNO (SET_DEST (elt)) != (unsigned int)(dest_regno + i - base)
|| GET_CODE (SET_SRC (elt)) != MEM
|| GET_MODE (SET_SRC (elt)) != SImode
|| GET_CODE (XEXP (SET_SRC (elt), 0)) != PLUS
}
/* Return 1 if OP is a store multiple operation. It is known to be
- parallel and the first section will be tested. */
-
+ parallel and the first section will be tested. */
int
store_multiple_operation (op, mode)
rtx op;
- enum machine_mode mode;
+ enum machine_mode mode ATTRIBUTE_UNUSED;
{
HOST_WIDE_INT count = XVECLEN (op, 0);
int src_regno;
|| GET_CODE (XVECEXP (op, 0, 0)) != SET)
return 0;
- /* Check to see if this might be a write-back */
+ /* Check to see if this might be a write-back. */
if (GET_CODE (SET_SRC (elt = XVECEXP (op, 0, 0))) == PLUS)
{
i++;
base = 1;
- /* Now check it more carefully */
+ /* Now check it more carefully. */
if (GET_CODE (SET_DEST (elt)) != REG
|| GET_CODE (XEXP (SET_SRC (elt), 0)) != REG
|| REGNO (XEXP (SET_SRC (elt), 0)) != REGNO (SET_DEST (elt))
if (GET_CODE (elt) != SET
|| GET_CODE (SET_SRC (elt)) != REG
|| GET_MODE (SET_SRC (elt)) != SImode
- || REGNO (SET_SRC (elt)) != src_regno + i - base
+ || REGNO (SET_SRC (elt)) != (unsigned int)(src_regno + i - base)
|| GET_CODE (SET_DEST (elt)) != MEM
|| GET_MODE (SET_DEST (elt)) != SImode
|| GET_CODE (XEXP (SET_DEST (elt), 0)) != PLUS
int
load_multiple_sequence (operands, nops, regs, base, load_offset)
- rtx *operands;
+ rtx * operands;
int nops;
- int *regs;
- int *base;
- HOST_WIDE_INT *load_offset;
+ int * regs;
+ int * base;
+ HOST_WIDE_INT * load_offset;
{
int unsorted_regs[4];
HOST_WIDE_INT unsorted_offsets[4];
int order[4];
- int base_reg;
+ int base_reg = -1;
int i;
/* Can only handle 2, 3, or 4 insns at present, though could be easily
rtx reg;
rtx offset;
+ /* Convert a subreg of a mem into the mem itself. */
+ if (GET_CODE (operands[nops + i]) == SUBREG)
+ operands[nops + i] = alter_subreg (operands[nops + i]);
+
if (GET_CODE (operands[nops + i]) != MEM)
abort ();
{
if (i == 0)
{
- base_reg = REGNO(reg);
+ base_reg = REGNO (reg);
unsorted_regs[0] = (GET_CODE (operands[i]) == REG
? REGNO (operands[i])
: REGNO (SUBREG_REG (operands[i])));
}
else
{
- if (base_reg != REGNO (reg))
+ if (base_reg != (int) REGNO (reg))
/* Not addressed from the same base register. */
return 0;
if (unsorted_offsets[order[nops - 1]] == -4)
return 4; /* ldmdb */
+ /* For ARM8,9 & StrongARM, 2 ldr instructions are faster than an ldm
+ if the offset isn't small enough. The reason 2 ldrs are faster
+ is because these ARMs are able to do more than one cache access
+ in a single cycle. The ARM9 and StrongARM have Harvard caches,
+ whilst the ARM8 has a double bandwidth cache. This means that
+ these cores can do both an instruction fetch and a data fetch in
+ a single cycle, so the trick of calculating the address into a
+ scratch register (one of the result regs) and then doing a load
+ multiple actually becomes slower (and no smaller in code size).
+ That is the transformation
+
+ ldr rd1, [rbase + offset]
+ ldr rd2, [rbase + offset + 4]
+
+ to
+
+ add rd1, rbase, offset
+ ldmia rd1, {rd1, rd2}
+
+ produces worse code -- '3 cycles + any stalls on rd2' instead of
+ '2 cycles + any stalls on rd2'. On ARMs with only one cache
+ access per cycle, the first sequence could never complete in less
+ than 6 cycles, whereas the ldm sequence would only take 5 and
+ would make better use of sequential accesses if not hitting the
+ cache.
+
+ We cheat here and test 'arm_ld_sched' which we currently know to
+ only be true for the ARM8, ARM9 and StrongARM. If this ever
+ changes, then the test below needs to be reworked. */
+ if (nops == 2 && arm_ld_sched)
+ return 0;
+
/* Can't do it without setting up the offset, only do this if it takes
no more than one insn. */
return (const_ok_for_arm (unsorted_offsets[order[0]])
char *
emit_ldm_seq (operands, nops)
- rtx *operands;
+ rtx * operands;
int nops;
{
int regs[4];
int
store_multiple_sequence (operands, nops, regs, base, load_offset)
- rtx *operands;
+ rtx * operands;
int nops;
- int *regs;
- int *base;
- HOST_WIDE_INT *load_offset;
+ int * regs;
+ int * base;
+ HOST_WIDE_INT * load_offset;
{
int unsorted_regs[4];
HOST_WIDE_INT unsorted_offsets[4];
int order[4];
- int base_reg;
+ int base_reg = -1;
int i;
/* Can only handle 2, 3, or 4 insns at present, though could be easily
rtx reg;
rtx offset;
+ /* Convert a subreg of a mem into the mem itself. */
+ if (GET_CODE (operands[nops + i]) == SUBREG)
+ operands[nops + i] = alter_subreg (operands[nops + i]);
+
if (GET_CODE (operands[nops + i]) != MEM)
abort ();
{
if (i == 0)
{
- base_reg = REGNO(reg);
+ base_reg = REGNO (reg);
unsorted_regs[0] = (GET_CODE (operands[i]) == REG
? REGNO (operands[i])
: REGNO (SUBREG_REG (operands[i])));
}
else
{
- if (base_reg != REGNO (reg))
+ if (base_reg != (int) REGNO (reg))
/* Not addressed from the same base register. */
return 0;
char *
emit_stm_seq (operands, nops)
- rtx *operands;
+ rtx * operands;
int nops;
{
int regs[4];
int
multi_register_push (op, mode)
rtx op;
- enum machine_mode mode;
+ enum machine_mode mode ATTRIBUTE_UNUSED;
{
if (GET_CODE (op) != PARALLEL
|| (GET_CODE (XVECEXP (op, 0, 0)) != SET)
return 1;
}
-
\f
-/* Routines for use with attributes */
+/* Routines for use with attributes. */
/* Return nonzero if ATTR is a valid attribute for DECL.
- ATTRIBUTES are any existing attributes and ARGS are the arguments
- supplied with ATTR.
+ ATTRIBUTES are any existing attributes and ARGS are
+ the arguments supplied with ATTR.
Supported attributes:
- naked: don't output any prologue or epilogue code, the user is assumed
- to do the right thing. */
-
+ naked:
+ don't output any prologue or epilogue code, the user is assumed
+ to do the right thing.
+
+ interfacearm:
+ Always assume that this function will be entered in ARM mode,
+ not Thumb mode, and that the caller wishes to be returned to in
+ ARM mode. */
int
-arm_valid_machine_decl_attribute (decl, attributes, attr, args)
+arm_valid_machine_decl_attribute (decl, attr, args)
tree decl;
- tree attributes;
tree attr;
tree args;
{
if (is_attribute_p ("naked", attr))
return TREE_CODE (decl) == FUNCTION_DECL;
+
+#ifdef ARM_PE
+ if (is_attribute_p ("interfacearm", attr))
+ return TREE_CODE (decl) == FUNCTION_DECL;
+#endif /* ARM_PE */
+
return 0;
}
/* Return non-zero if FUNC is a naked function. */
-
static int
arm_naked_function_p (func)
tree func;
if (TREE_CODE (func) != FUNCTION_DECL)
abort ();
-
+
a = lookup_attribute ("naked", DECL_MACHINE_ATTRIBUTES (func));
return a != NULL_TREE;
}
\f
-/* Routines for use in generating RTL */
-
+/* Routines for use in generating RTL. */
rtx
-arm_gen_load_multiple (base_regno, count, from, up, write_back)
+arm_gen_load_multiple (base_regno, count, from, up, write_back, unchanging_p,
+ in_struct_p, scalar_p)
int base_regno;
int count;
rtx from;
int up;
int write_back;
+ int unchanging_p;
+ int in_struct_p;
+ int scalar_p;
{
int i = 0, j;
rtx result;
int sign = up ? 1 : -1;
+ rtx mem;
- result = gen_rtx (PARALLEL, VOIDmode,
- rtvec_alloc (count + (write_back ? 2 : 0)));
+ result = gen_rtx_PARALLEL (VOIDmode,
+ rtvec_alloc (count + (write_back ? 2 : 0)));
if (write_back)
{
XVECEXP (result, 0, 0)
- = gen_rtx (SET, GET_MODE (from), from,
- plus_constant (from, count * 4 * sign));
+ = gen_rtx_SET (GET_MODE (from), from,
+ plus_constant (from, count * 4 * sign));
i = 1;
count++;
}
for (j = 0; i < count; i++, j++)
{
+ mem = gen_rtx_MEM (SImode, plus_constant (from, j * 4 * sign));
+ RTX_UNCHANGING_P (mem) = unchanging_p;
+ MEM_IN_STRUCT_P (mem) = in_struct_p;
+ MEM_SCALAR_P (mem) = scalar_p;
XVECEXP (result, 0, i)
- = gen_rtx (SET, VOIDmode, gen_rtx (REG, SImode, base_regno + j),
- gen_rtx (MEM, SImode,
- plus_constant (from, j * 4 * sign)));
+ = gen_rtx_SET (VOIDmode, gen_rtx_REG (SImode, base_regno + j), mem);
}
if (write_back)
- XVECEXP (result, 0, i) = gen_rtx (CLOBBER, SImode, from);
+ XVECEXP (result, 0, i) = gen_rtx_CLOBBER (SImode, from);
return result;
}
rtx
-arm_gen_store_multiple (base_regno, count, to, up, write_back)
+arm_gen_store_multiple (base_regno, count, to, up, write_back, unchanging_p,
+ in_struct_p, scalar_p)
int base_regno;
int count;
rtx to;
int up;
int write_back;
+ int unchanging_p;
+ int in_struct_p;
+ int scalar_p;
{
int i = 0, j;
rtx result;
int sign = up ? 1 : -1;
+ rtx mem;
- result = gen_rtx (PARALLEL, VOIDmode,
- rtvec_alloc (count + (write_back ? 2 : 0)));
+ result = gen_rtx_PARALLEL (VOIDmode,
+ rtvec_alloc (count + (write_back ? 2 : 0)));
if (write_back)
{
XVECEXP (result, 0, 0)
- = gen_rtx (SET, GET_MODE (to), to,
- plus_constant (to, count * 4 * sign));
+ = gen_rtx_SET (GET_MODE (to), to,
+ plus_constant (to, count * 4 * sign));
i = 1;
count++;
}
for (j = 0; i < count; i++, j++)
{
+ mem = gen_rtx_MEM (SImode, plus_constant (to, j * 4 * sign));
+ RTX_UNCHANGING_P (mem) = unchanging_p;
+ MEM_IN_STRUCT_P (mem) = in_struct_p;
+ MEM_SCALAR_P (mem) = scalar_p;
+
XVECEXP (result, 0, i)
- = gen_rtx (SET, VOIDmode,
- gen_rtx (MEM, SImode, plus_constant (to, j * 4 * sign)),
- gen_rtx (REG, SImode, base_regno + j));
+ = gen_rtx_SET (VOIDmode, mem, gen_rtx_REG (SImode, base_regno + j));
}
if (write_back)
- XVECEXP (result, 0, i) = gen_rtx (CLOBBER, SImode, to);
+ XVECEXP (result, 0, i) = gen_rtx_CLOBBER (SImode, to);
return result;
}
int
arm_gen_movstrqi (operands)
- rtx *operands;
+ rtx * operands;
{
HOST_WIDE_INT in_words_to_go, out_words_to_go, last_bytes;
- int i, r;
+ int i;
rtx src, dst;
- rtx st_src, st_dst, end_src, end_dst, fin_src, fin_dst;
+ rtx st_src, st_dst, fin_src, fin_dst;
rtx part_bytes_reg = NULL;
- extern int optimize;
+ rtx mem;
+ int dst_unchanging_p, dst_in_struct_p, src_unchanging_p, src_in_struct_p;
+ int dst_scalar_p, src_scalar_p;
if (GET_CODE (operands[2]) != CONST_INT
|| GET_CODE (operands[3]) != CONST_INT
st_dst = XEXP (operands[0], 0);
st_src = XEXP (operands[1], 0);
+
+ dst_unchanging_p = RTX_UNCHANGING_P (operands[0]);
+ dst_in_struct_p = MEM_IN_STRUCT_P (operands[0]);
+ dst_scalar_p = MEM_SCALAR_P (operands[0]);
+ src_unchanging_p = RTX_UNCHANGING_P (operands[1]);
+ src_in_struct_p = MEM_IN_STRUCT_P (operands[1]);
+ src_scalar_p = MEM_SCALAR_P (operands[1]);
+
fin_dst = dst = copy_to_mode_reg (SImode, st_dst);
fin_src = src = copy_to_mode_reg (SImode, st_src);
- in_words_to_go = (INTVAL (operands[2]) + 3) / 4;
+ in_words_to_go = NUM_INTS (INTVAL (operands[2]));
out_words_to_go = INTVAL (operands[2]) / 4;
last_bytes = INTVAL (operands[2]) & 3;
if (out_words_to_go != in_words_to_go && ((in_words_to_go - 1) & 3) != 0)
- part_bytes_reg = gen_rtx (REG, SImode, (in_words_to_go - 1) & 3);
+ part_bytes_reg = gen_rtx_REG (SImode, (in_words_to_go - 1) & 3);
for (i = 0; in_words_to_go >= 2; i+=4)
{
if (in_words_to_go > 4)
- emit_insn (arm_gen_load_multiple (0, 4, src, TRUE, TRUE));
+ emit_insn (arm_gen_load_multiple (0, 4, src, TRUE, TRUE,
+ src_unchanging_p,
+ src_in_struct_p,
+ src_scalar_p));
else
emit_insn (arm_gen_load_multiple (0, in_words_to_go, src, TRUE,
- FALSE));
+ FALSE, src_unchanging_p,
+ src_in_struct_p, src_scalar_p));
if (out_words_to_go)
{
if (out_words_to_go > 4)
- emit_insn (arm_gen_store_multiple (0, 4, dst, TRUE, TRUE));
+ emit_insn (arm_gen_store_multiple (0, 4, dst, TRUE, TRUE,
+ dst_unchanging_p,
+ dst_in_struct_p,
+ dst_scalar_p));
else if (out_words_to_go != 1)
emit_insn (arm_gen_store_multiple (0, out_words_to_go,
dst, TRUE,
(last_bytes == 0
- ? FALSE : TRUE)));
+ ? FALSE : TRUE),
+ dst_unchanging_p,
+ dst_in_struct_p,
+ dst_scalar_p));
else
{
- emit_move_insn (gen_rtx (MEM, SImode, dst),
- gen_rtx (REG, SImode, 0));
+ mem = gen_rtx_MEM (SImode, dst);
+ RTX_UNCHANGING_P (mem) = dst_unchanging_p;
+ MEM_IN_STRUCT_P (mem) = dst_in_struct_p;
+ MEM_SCALAR_P (mem) = dst_scalar_p;
+ emit_move_insn (mem, gen_rtx_REG (SImode, 0));
if (last_bytes != 0)
emit_insn (gen_addsi3 (dst, dst, GEN_INT (4)));
}
/* OUT_WORDS_TO_GO will be zero here if there are byte stores to do. */
if (out_words_to_go)
- {
- rtx sreg;
-
- emit_move_insn (sreg = gen_reg_rtx (SImode), gen_rtx (MEM, SImode, src));
- emit_move_insn (fin_src = gen_reg_rtx (SImode), plus_constant (src, 4));
- emit_move_insn (gen_rtx (MEM, SImode, dst), sreg);
- emit_move_insn (fin_dst = gen_reg_rtx (SImode), plus_constant (dst, 4));
- in_words_to_go--;
-
- if (in_words_to_go) /* Sanity check */
- abort ();
- }
+ {
+ rtx sreg;
+
+ mem = gen_rtx_MEM (SImode, src);
+ RTX_UNCHANGING_P (mem) = src_unchanging_p;
+ MEM_IN_STRUCT_P (mem) = src_in_struct_p;
+ MEM_SCALAR_P (mem) = src_scalar_p;
+ emit_move_insn (sreg = gen_reg_rtx (SImode), mem);
+ emit_move_insn (fin_src = gen_reg_rtx (SImode), plus_constant (src, 4));
+
+ mem = gen_rtx_MEM (SImode, dst);
+ RTX_UNCHANGING_P (mem) = dst_unchanging_p;
+ MEM_IN_STRUCT_P (mem) = dst_in_struct_p;
+ MEM_SCALAR_P (mem) = dst_scalar_p;
+ emit_move_insn (mem, sreg);
+ emit_move_insn (fin_dst = gen_reg_rtx (SImode), plus_constant (dst, 4));
+ in_words_to_go--;
+
+ if (in_words_to_go) /* Sanity check */
+ abort ();
+ }
if (in_words_to_go)
{
if (in_words_to_go < 0)
abort ();
- part_bytes_reg = copy_to_mode_reg (SImode, gen_rtx (MEM, SImode, src));
+ mem = gen_rtx_MEM (SImode, src);
+ RTX_UNCHANGING_P (mem) = src_unchanging_p;
+ MEM_IN_STRUCT_P (mem) = src_in_struct_p;
+ MEM_SCALAR_P (mem) = src_scalar_p;
+ part_bytes_reg = copy_to_mode_reg (SImode, mem);
}
+ if (last_bytes && part_bytes_reg == NULL)
+ abort ();
+
if (BYTES_BIG_ENDIAN && last_bytes)
{
rtx tmp = gen_reg_rtx (SImode);
- if (part_bytes_reg == NULL)
- abort ();
-
- /* The bytes we want are in the top end of the word */
+ /* The bytes we want are in the top end of the word. */
emit_insn (gen_lshrsi3 (tmp, part_bytes_reg,
GEN_INT (8 * (4 - last_bytes))));
part_bytes_reg = tmp;
while (last_bytes)
{
- emit_move_insn (gen_rtx (MEM, QImode,
- plus_constant (dst, last_bytes - 1)),
- gen_rtx (SUBREG, QImode, part_bytes_reg, 0));
+ mem = gen_rtx_MEM (QImode, plus_constant (dst, last_bytes - 1));
+ RTX_UNCHANGING_P (mem) = dst_unchanging_p;
+ MEM_IN_STRUCT_P (mem) = dst_in_struct_p;
+ MEM_SCALAR_P (mem) = dst_scalar_p;
+ emit_move_insn (mem, gen_rtx_SUBREG (QImode, part_bytes_reg, 0));
+
if (--last_bytes)
{
tmp = gen_reg_rtx (SImode);
}
else
{
- while (last_bytes)
+ if (last_bytes > 1)
{
- if (part_bytes_reg == NULL)
- abort ();
-
- emit_move_insn (gen_rtx (MEM, QImode, dst),
- gen_rtx (SUBREG, QImode, part_bytes_reg, 0));
- if (--last_bytes)
+ mem = gen_rtx_MEM (HImode, dst);
+ RTX_UNCHANGING_P (mem) = dst_unchanging_p;
+ MEM_IN_STRUCT_P (mem) = dst_in_struct_p;
+ MEM_SCALAR_P (mem) = dst_scalar_p;
+ emit_move_insn (mem, gen_rtx_SUBREG (HImode, part_bytes_reg, 0));
+ last_bytes -= 2;
+ if (last_bytes)
{
rtx tmp = gen_reg_rtx (SImode);
- emit_insn (gen_addsi3 (dst, dst, const1_rtx));
- emit_insn (gen_lshrsi3 (tmp, part_bytes_reg, GEN_INT (8)));
+ emit_insn (gen_addsi3 (dst, dst, GEN_INT (2)));
+ emit_insn (gen_lshrsi3 (tmp, part_bytes_reg, GEN_INT (16)));
part_bytes_reg = tmp;
}
}
+
+ if (last_bytes)
+ {
+ mem = gen_rtx_MEM (QImode, dst);
+ RTX_UNCHANGING_P (mem) = dst_unchanging_p;
+ MEM_IN_STRUCT_P (mem) = dst_in_struct_p;
+ MEM_SCALAR_P (mem) = dst_scalar_p;
+ emit_move_insn (mem, gen_rtx_SUBREG (QImode, part_bytes_reg, 0));
+ }
}
return 1;
into the top 16 bits of the word. We can assume that the address is
known to be alignable and of the form reg, or plus (reg, const). */
rtx
-gen_rotated_half_load (memref)
+arm_gen_rotated_half_load (memref)
rtx memref;
{
HOST_WIDE_INT offset = 0;
base = XEXP (base, 0);
}
- /* If we aren't allowed to generate unalligned addresses, then fail. */
- if (TARGET_SHORT_BY_BYTES
+ /* If we aren't allowed to generate unaligned addresses, then fail. */
+ if (TARGET_MMU_TRAPS
&& ((BYTES_BIG_ENDIAN ? 1 : 0) ^ ((offset & 2) == 0)))
return NULL;
- base = gen_rtx (MEM, SImode, plus_constant (base, offset & ~2));
+ base = gen_rtx_MEM (SImode, plus_constant (base, offset & ~2));
if ((BYTES_BIG_ENDIAN ? 1 : 0) ^ ((offset & 2) == 2))
return base;
- return gen_rtx (ROTATE, SImode, base, GEN_INT (16));
+ return gen_rtx_ROTATE (SImode, base, GEN_INT (16));
}
static enum machine_mode
-select_dominance_cc_mode (op, x, y, cond_or)
- enum rtx_code op;
+select_dominance_cc_mode (x, y, cond_or)
rtx x;
rtx y;
HOST_WIDE_INT cond_or;
/* Currently we will probably get the wrong result if the individual
comparisons are not simple. This also ensures that it is safe to
- reverse a comparions if necessary. */
+ reverse a comparison if necessary. */
if ((arm_select_cc_mode (cond1 = GET_CODE (x), XEXP (x, 0), XEXP (x, 1))
!= CCmode)
|| (arm_select_cc_mode (cond2 = GET_CODE (y), XEXP (y, 0), XEXP (y, 1))
case LEU: return CC_DLEUmode;
case GE: return CC_DGEmode;
case GEU: return CC_DGEUmode;
+ default: break;
}
break;
case GEU:
return CC_DGEUmode;
+
+ default:
+ break;
}
abort ();
|| GET_CODE (x) == ROTATERT))
return CC_SWPmode;
- /* This is a special case, that is used by combine to alow a
- comarison of a shifted byte load to be split into a zero-extend
+ /* This is a special case that is used by combine to allow a
+ comparison of a shifted byte load to be split into a zero-extend
followed by a comparison of the shifted integer (only valid for
- equalities and unsigned inequalites. */
+ equalities and unsigned inequalities). */
if (GET_MODE (x) == SImode
&& GET_CODE (x) == ASHIFT
&& GET_CODE (XEXP (x, 1)) == CONST_INT && INTVAL (XEXP (x, 1)) == 24
|| XEXP (x, 2) == const1_rtx)
&& GET_RTX_CLASS (GET_CODE (XEXP (x, 0))) == '<'
&& GET_RTX_CLASS (GET_CODE (XEXP (x, 1))) == '<')
- return select_dominance_cc_mode (op, XEXP (x, 0), XEXP (x, 1),
+ return select_dominance_cc_mode (XEXP (x, 0), XEXP (x, 1),
INTVAL (XEXP (x, 2)));
if (GET_MODE (x) == QImode && (op == EQ || op == NE))
floating point compare: I don't think that it is needed on the arm. */
rtx
-gen_compare_reg (code, x, y, fp)
+arm_gen_compare_reg (code, x, y)
enum rtx_code code;
rtx x, y;
{
enum machine_mode mode = SELECT_CC_MODE (code, x, y);
- rtx cc_reg = gen_rtx (REG, mode, 24);
+ rtx cc_reg = gen_rtx_REG (mode, CC_REGNUM);
- emit_insn (gen_rtx (SET, VOIDmode, cc_reg,
- gen_rtx (COMPARE, mode, x, y)));
+ emit_insn (gen_rtx_SET (VOIDmode, cc_reg,
+ gen_rtx_COMPARE (mode, x, y)));
return cc_reg;
}
void
arm_reload_in_hi (operands)
- rtx *operands;
-{
- rtx base = find_replacement (&XEXP (operands[1], 0));
-
- emit_insn (gen_zero_extendqisi2 (operands[2], gen_rtx (MEM, QImode, base)));
- emit_insn (gen_zero_extendqisi2 (gen_rtx (SUBREG, SImode, operands[0], 0),
- gen_rtx (MEM, QImode,
- plus_constant (base, 1))));
- if (BYTES_BIG_ENDIAN)
- emit_insn (gen_rtx (SET, VOIDmode, gen_rtx (SUBREG, SImode,
- operands[0], 0),
- gen_rtx (IOR, SImode,
- gen_rtx (ASHIFT, SImode,
- gen_rtx (SUBREG, SImode,
- operands[0], 0),
- GEN_INT (8)),
- operands[2])));
- else
- emit_insn (gen_rtx (SET, VOIDmode, gen_rtx (SUBREG, SImode,
- operands[0], 0),
- gen_rtx (IOR, SImode,
- gen_rtx (ASHIFT, SImode,
- operands[2],
- GEN_INT (8)),
- gen_rtx (SUBREG, SImode, operands[0], 0))));
-}
-
-void
-arm_reload_out_hi (operands)
- rtx *operands;
+ rtx * operands;
{
- rtx base = find_replacement (&XEXP (operands[0], 0));
+ rtx ref = operands[1];
+ rtx base, scratch;
+ HOST_WIDE_INT offset = 0;
- if (BYTES_BIG_ENDIAN)
+ if (GET_CODE (ref) == SUBREG)
{
- emit_insn (gen_movqi (gen_rtx (MEM, QImode, plus_constant (base, 1)),
- gen_rtx (SUBREG, QImode, operands[1], 0)));
- emit_insn (gen_lshrsi3 (operands[2],
- gen_rtx (SUBREG, SImode, operands[1], 0),
- GEN_INT (8)));
- emit_insn (gen_movqi (gen_rtx (MEM, QImode, base),
- gen_rtx (SUBREG, QImode, operands[2], 0)));
+ offset = SUBREG_WORD (ref) * UNITS_PER_WORD;
+ if (BYTES_BIG_ENDIAN)
+ offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (ref)))
+ - MIN (UNITS_PER_WORD,
+ GET_MODE_SIZE (GET_MODE (SUBREG_REG (ref)))));
+ ref = SUBREG_REG (ref);
}
- else
+
+ if (GET_CODE (ref) == REG)
{
- emit_insn (gen_movqi (gen_rtx (MEM, QImode, base),
- gen_rtx (SUBREG, QImode, operands[1], 0)));
- emit_insn (gen_lshrsi3 (operands[2],
- gen_rtx (SUBREG, SImode, operands[1], 0),
- GEN_INT (8)));
- emit_insn (gen_movqi (gen_rtx (MEM, QImode, plus_constant (base, 1)),
- gen_rtx (SUBREG, QImode, operands[2], 0)));
+ /* We have a pseudo which has been spilt onto the stack; there
+ are two cases here: the first where there is a simple
+ stack-slot replacement and a second where the stack-slot is
+ out of range, or is used as a subreg. */
+ if (reg_equiv_mem[REGNO (ref)])
+ {
+ ref = reg_equiv_mem[REGNO (ref)];
+ base = find_replacement (&XEXP (ref, 0));
+ }
+ else
+ /* The slot is out of range, or was dressed up in a SUBREG. */
+ base = reg_equiv_address[REGNO (ref)];
}
-}
-\f
-/* Routines for manipulation of the constant pool. */
-/* This is unashamedly hacked from the version in sh.c, since the problem is
- extremely similar. */
-
-/* Arm instructions cannot load a large constant into a register,
- constants have to come from a pc relative load. The reference of a pc
- relative load instruction must be less than 1k infront of the instruction.
- This means that we often have to dump a constant inside a function, and
- generate code to branch around it.
-
- It is important to minimize this, since the branches will slow things
- down and make things bigger.
-
- Worst case code looks like:
+ else
+ base = find_replacement (&XEXP (ref, 0));
- ldr rn, L1
- b L2
- align
- L1: .long value
- L2:
- ..
+ /* Handle the case where the address is too complex to be offset by 1. */
+ if (GET_CODE (base) == MINUS
+ || (GET_CODE (base) == PLUS && GET_CODE (XEXP (base, 1)) != CONST_INT))
+ {
+ rtx base_plus = gen_rtx_REG (SImode, REGNO (operands[2]) + 1);
- ldr rn, L3
- b L4
- align
- L3: .long value
- L4:
- ..
+ emit_insn (gen_rtx_SET (VOIDmode, base_plus, base));
+ base = base_plus;
+ }
+ else if (GET_CODE (base) == PLUS)
+ {
+ /* The addend must be CONST_INT, or we would have dealt with it above. */
+ HOST_WIDE_INT hi, lo;
- We fix this by performing a scan before scheduling, which notices which
- instructions need to have their operands fetched from the constant table
- and builds the table.
+ offset += INTVAL (XEXP (base, 1));
+ base = XEXP (base, 0);
+ /* Rework the address into a legal sequence of insns. */
+ /* Valid range for lo is -4095 -> 4095 */
+ lo = (offset >= 0
+ ? (offset & 0xfff)
+ : -((-offset) & 0xfff));
- The algorithm is:
+ /* Corner case, if lo is the max offset then we would be out of range
+ once we have added the additional 1 below, so bump the msb into the
+ pre-loading insn(s). */
+ if (lo == 4095)
+ lo &= 0x7ff;
- scan, find an instruction which needs a pcrel move. Look forward, find th
- last barrier which is within MAX_COUNT bytes of the requirement.
- If there isn't one, make one. Process all the instructions between
- the find and the barrier.
+ hi = ((((offset - lo) & HOST_INT (0xffffffff))
+ ^ HOST_INT (0x80000000))
+ - HOST_INT (0x80000000));
- In the above example, we can tell that L3 is within 1k of L1, so
- the first move can be shrunk from the 2 insn+constant sequence into
- just 1 insn, and the constant moved to L3 to make:
+ if (hi + lo != offset)
+ abort ();
- ldr rn, L1
- ..
- ldr rn, L3
- b L4
- align
- L1: .long value
- L3: .long value
- L4:
+ if (hi != 0)
+ {
+ rtx base_plus = gen_rtx_REG (SImode, REGNO (operands[2]) + 1);
- Then the second move becomes the target for the shortening process.
+ /* Get the base address; addsi3 knows how to handle constants
+ that require more than one insn. */
+ emit_insn (gen_addsi3 (base_plus, base, GEN_INT (hi)));
+ base = base_plus;
+ offset = lo;
+ }
+ }
- */
+ scratch = gen_rtx_REG (SImode, REGNO (operands[2]));
+ emit_insn (gen_zero_extendqisi2 (scratch,
+ gen_rtx_MEM (QImode,
+ plus_constant (base,
+ offset))));
+ emit_insn (gen_zero_extendqisi2 (gen_rtx_SUBREG (SImode, operands[0], 0),
+ gen_rtx_MEM (QImode,
+ plus_constant (base,
+ offset + 1))));
+ if (! BYTES_BIG_ENDIAN)
+ emit_insn (gen_rtx_SET (VOIDmode, gen_rtx_SUBREG (SImode, operands[0], 0),
+ gen_rtx_IOR (SImode,
+ gen_rtx_ASHIFT
+ (SImode,
+ gen_rtx_SUBREG (SImode, operands[0], 0),
+ GEN_INT (8)),
+ scratch)));
+ else
+ emit_insn (gen_rtx_SET (VOIDmode, gen_rtx_SUBREG (SImode, operands[0], 0),
+ gen_rtx_IOR (SImode,
+ gen_rtx_ASHIFT (SImode, scratch,
+ GEN_INT (8)),
+ gen_rtx_SUBREG (SImode, operands[0],
+ 0))));
+}
-typedef struct
+/* Handle storing a half-word to memory during reload by synthesising as two
+ byte stores. Take care not to clobber the input values until after we
+ have moved them somewhere safe. This code assumes that if the DImode
+ scratch in operands[2] overlaps either the input value or output address
+ in some way, then that value must die in this insn (we absolutely need
+ two scratch registers for some corner cases). */
+void
+arm_reload_out_hi (operands)
+ rtx * operands;
{
- rtx value; /* Value in table */
- HOST_WIDE_INT next_offset;
- enum machine_mode mode; /* Mode of value */
-} pool_node;
-
-/* The maximum number of constants that can fit into one pool, since
- the pc relative range is 0...1020 bytes and constants are at least 4
- bytes long */
+ rtx ref = operands[0];
+ rtx outval = operands[1];
+ rtx base, scratch;
+ HOST_WIDE_INT offset = 0;
-#define MAX_POOL_SIZE (1020/4)
-static pool_node pool_vector[MAX_POOL_SIZE];
-static int pool_size;
-static rtx pool_vector_label;
+ if (GET_CODE (ref) == SUBREG)
+ {
+ offset = SUBREG_WORD (ref) * UNITS_PER_WORD;
+ if (BYTES_BIG_ENDIAN)
+ offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (ref)))
+ - MIN (UNITS_PER_WORD,
+ GET_MODE_SIZE (GET_MODE (SUBREG_REG (ref)))));
+ ref = SUBREG_REG (ref);
+ }
-/* Add a constant to the pool and return its label. */
-static HOST_WIDE_INT
-add_constant (x, mode)
- rtx x;
- enum machine_mode mode;
-{
- int i;
- rtx lab;
- HOST_WIDE_INT offset;
- if (mode == SImode && GET_CODE (x) == MEM && CONSTANT_P (XEXP (x, 0))
- && CONSTANT_POOL_ADDRESS_P (XEXP (x, 0)))
- x = get_pool_constant (XEXP (x, 0));
-#ifndef AOF_ASSEMBLER
- else if (GET_CODE (x) == UNSPEC && XINT (x, 1) == 3)
- x = XVECEXP (x, 0, 0);
-#endif
+ if (GET_CODE (ref) == REG)
+ {
+ /* We have a pseudo which has been spilt onto the stack; there
+ are two cases here: the first where there is a simple
+ stack-slot replacement and a second where the stack-slot is
+ out of range, or is used as a subreg. */
+ if (reg_equiv_mem[REGNO (ref)])
+ {
+ ref = reg_equiv_mem[REGNO (ref)];
+ base = find_replacement (&XEXP (ref, 0));
+ }
+ else
+ /* The slot is out of range, or was dressed up in a SUBREG. */
+ base = reg_equiv_address[REGNO (ref)];
+ }
+ else
+ base = find_replacement (&XEXP (ref, 0));
-#ifdef AOF_ASSEMBLER
- /* PIC Symbol references need to be converted into offsets into the
- based area. */
- if (flag_pic && GET_CODE (x) == SYMBOL_REF)
- x = aof_pic_entry (x);
-#endif /* AOF_ASSEMBLER */
+ scratch = gen_rtx_REG (SImode, REGNO (operands[2]));
- /* First see if we've already got it */
- for (i = 0; i < pool_size; i++)
+ /* Handle the case where the address is too complex to be offset by 1. */
+ if (GET_CODE (base) == MINUS
+ || (GET_CODE (base) == PLUS && GET_CODE (XEXP (base, 1)) != CONST_INT))
{
- if (GET_CODE (x) == pool_vector[i].value->code
- && mode == pool_vector[i].mode)
+ rtx base_plus = gen_rtx_REG (SImode, REGNO (operands[2]) + 1);
+
+ /* Be careful not to destroy OUTVAL. */
+ if (reg_overlap_mentioned_p (base_plus, outval))
{
- if (GET_CODE (x) == CODE_LABEL)
+ /* Updating base_plus might destroy outval, see if we can
+ swap the scratch and base_plus. */
+ if (! reg_overlap_mentioned_p (scratch, outval))
+ {
+ rtx tmp = scratch;
+ scratch = base_plus;
+ base_plus = tmp;
+ }
+ else
{
- if (XINT (x, 3) != XINT (pool_vector[i].value, 3))
- continue;
+ rtx scratch_hi = gen_rtx_REG (HImode, REGNO (operands[2]));
+
+ /* Be conservative and copy OUTVAL into the scratch now,
+ this should only be necessary if outval is a subreg
+ of something larger than a word. */
+ /* XXX Might this clobber base? I can't see how it can,
+ since scratch is known to overlap with OUTVAL, and
+ must be wider than a word. */
+ emit_insn (gen_movhi (scratch_hi, outval));
+ outval = scratch_hi;
}
- if (rtx_equal_p (x, pool_vector[i].value))
- return pool_vector[i].next_offset - GET_MODE_SIZE (mode);
}
+
+ emit_insn (gen_rtx_SET (VOIDmode, base_plus, base));
+ base = base_plus;
}
+ else if (GET_CODE (base) == PLUS)
+ {
+ /* The addend must be CONST_INT, or we would have dealt with it above. */
+ HOST_WIDE_INT hi, lo;
- /* Need a new one */
- pool_vector[pool_size].next_offset = GET_MODE_SIZE (mode);
- offset = 0;
- if (pool_size == 0)
- pool_vector_label = gen_label_rtx ();
- else
- pool_vector[pool_size].next_offset
- += (offset = pool_vector[pool_size - 1].next_offset);
+ offset += INTVAL (XEXP (base, 1));
+ base = XEXP (base, 0);
- pool_vector[pool_size].value = x;
- pool_vector[pool_size].mode = mode;
- pool_size++;
- return offset;
-}
+ /* Rework the address into a legal sequence of insns. */
+ /* Valid range for lo is -4095 -> 4095 */
+ lo = (offset >= 0
+ ? (offset & 0xfff)
+ : -((-offset) & 0xfff));
-/* Output the literal table */
-static void
-dump_table (scan)
- rtx scan;
-{
- int i;
+ /* Corner case, if lo is the max offset then we would be out of range
+ once we have added the additional 1 below, so bump the msb into the
+ pre-loading insn(s). */
+ if (lo == 4095)
+ lo &= 0x7ff;
- scan = emit_label_after (gen_label_rtx (), scan);
- scan = emit_insn_after (gen_align_4 (), scan);
- scan = emit_label_after (pool_vector_label, scan);
+ hi = ((((offset - lo) & HOST_INT (0xffffffff))
+ ^ HOST_INT (0x80000000))
+ - HOST_INT (0x80000000));
- for (i = 0; i < pool_size; i++)
- {
- pool_node *p = pool_vector + i;
+ if (hi + lo != offset)
+ abort ();
- switch (GET_MODE_SIZE (p->mode))
+ if (hi != 0)
{
- case 4:
- scan = emit_insn_after (gen_consttable_4 (p->value), scan);
- break;
+ rtx base_plus = gen_rtx_REG (SImode, REGNO (operands[2]) + 1);
- case 8:
- scan = emit_insn_after (gen_consttable_8 (p->value), scan);
- break;
+ /* Be careful not to destroy OUTVAL. */
+ if (reg_overlap_mentioned_p (base_plus, outval))
+ {
+ /* Updating base_plus might destroy outval, see if we
+ can swap the scratch and base_plus. */
+ if (! reg_overlap_mentioned_p (scratch, outval))
+ {
+ rtx tmp = scratch;
+ scratch = base_plus;
+ base_plus = tmp;
+ }
+ else
+ {
+ rtx scratch_hi = gen_rtx_REG (HImode, REGNO (operands[2]));
+
+ /* Be conservative and copy outval into scratch now,
+ this should only be necessary if outval is a
+ subreg of something larger than a word. */
+ /* XXX Might this clobber base? I can't see how it
+ can, since scratch is known to overlap with
+ outval. */
+ emit_insn (gen_movhi (scratch_hi, outval));
+ outval = scratch_hi;
+ }
+ }
- default:
- abort ();
- break;
+ /* Get the base address; addsi3 knows how to handle constants
+ that require more than one insn. */
+ emit_insn (gen_addsi3 (base_plus, base, GEN_INT (hi)));
+ base = base_plus;
+ offset = lo;
}
}
- scan = emit_insn_after (gen_consttable_end (), scan);
- scan = emit_barrier_after (scan);
- pool_size = 0;
-}
-
-/* Non zero if the src operand needs to be fixed up */
-static int
-fixit (src, mode, destreg)
- rtx src;
- enum machine_mode mode;
- int destreg;
-{
- if (CONSTANT_P (src))
+ if (BYTES_BIG_ENDIAN)
{
- if (GET_CODE (src) == CONST_INT)
- return (! const_ok_for_arm (INTVAL (src))
- && ! const_ok_for_arm (~INTVAL (src)));
- if (GET_CODE (src) == CONST_DOUBLE)
- return (GET_MODE (src) == VOIDmode
- || destreg < 16
- || (! const_double_rtx_ok_for_fpu (src)
- && ! neg_const_double_rtx_ok_for_fpu (src)));
- return symbol_mentioned_p (src);
+ emit_insn (gen_movqi (gen_rtx_MEM (QImode,
+ plus_constant (base, offset + 1)),
+ gen_rtx_SUBREG (QImode, outval, 0)));
+ emit_insn (gen_lshrsi3 (scratch,
+ gen_rtx_SUBREG (SImode, outval, 0),
+ GEN_INT (8)));
+ emit_insn (gen_movqi (gen_rtx_MEM (QImode, plus_constant (base, offset)),
+ gen_rtx_SUBREG (QImode, scratch, 0)));
}
-#ifndef AOF_ASSEMBLER
- else if (GET_CODE (src) == UNSPEC && XINT (src, 1) == 3)
- return 1;
-#endif
else
- return (mode == SImode && GET_CODE (src) == MEM
- && GET_CODE (XEXP (src, 0)) == SYMBOL_REF
- && CONSTANT_POOL_ADDRESS_P (XEXP (src, 0)));
+ {
+ emit_insn (gen_movqi (gen_rtx_MEM (QImode, plus_constant (base, offset)),
+ gen_rtx_SUBREG (QImode, outval, 0)));
+ emit_insn (gen_lshrsi3 (scratch,
+ gen_rtx_SUBREG (SImode, outval, 0),
+ GEN_INT (8)));
+ emit_insn (gen_movqi (gen_rtx_MEM (QImode,
+ plus_constant (base, offset + 1)),
+ gen_rtx_SUBREG (QImode, scratch, 0)));
+ }
}
-
-/* Find the last barrier less than MAX_COUNT bytes from FROM, or create one. */
-static rtx
-find_barrier (from, max_count)
- rtx from;
- int max_count;
+\f
+/* Print a symbolic form of X to the debug file, F. */
+static void
+arm_print_value (f, x)
+ FILE * f;
+ rtx x;
{
- int count = 0;
- rtx found_barrier = 0;
-
- while (from && count < max_count)
+ switch (GET_CODE (x))
{
- if (GET_CODE (from) == BARRIER)
- found_barrier = from;
+ case CONST_INT:
+ fprintf (f, HOST_WIDE_INT_PRINT_HEX, INTVAL (x));
+ return;
- /* Count the length of this insn */
- if (GET_CODE (from) == INSN
- && GET_CODE (PATTERN (from)) == SET
- && CONSTANT_P (SET_SRC (PATTERN (from)))
- && CONSTANT_POOL_ADDRESS_P (SET_SRC (PATTERN (from))))
- {
- rtx src = SET_SRC (PATTERN (from));
- count += 2;
- }
- else
- count += get_attr_length (from);
+ case CONST_DOUBLE:
+ fprintf (f, "<0x%lx,0x%lx>", (long)XWINT (x, 2), (long)XWINT (x, 3));
+ return;
- from = NEXT_INSN (from);
- }
+ case CONST_STRING:
+ fprintf (f, "\"%s\"", XSTR (x, 0));
+ return;
- if (!found_barrier)
- {
- /* We didn't find a barrier in time to
- dump our stuff, so we'll make one */
- rtx label = gen_label_rtx ();
+ case SYMBOL_REF:
+ fprintf (f, "`%s'", XSTR (x, 0));
+ return;
- if (from)
- from = PREV_INSN (from);
- else
- from = get_last_insn ();
+ case LABEL_REF:
+ fprintf (f, "L%d", INSN_UID (XEXP (x, 0)));
+ return;
- /* Walk back to be just before any jump */
- while (GET_CODE (from) == JUMP_INSN
- || GET_CODE (from) == NOTE
- || GET_CODE (from) == CODE_LABEL)
- from = PREV_INSN (from);
+ case CONST:
+ arm_print_value (f, XEXP (x, 0));
+ return;
- from = emit_jump_insn_after (gen_jump (label), from);
- JUMP_LABEL (from) = label;
- found_barrier = emit_barrier_after (from);
- emit_label_after (label, found_barrier);
- return found_barrier;
- }
+ case PLUS:
+ arm_print_value (f, XEXP (x, 0));
+ fprintf (f, "+");
+ arm_print_value (f, XEXP (x, 1));
+ return;
- return found_barrier;
-}
+ case PC:
+ fprintf (f, "pc");
+ return;
-/* Non zero if the insn is a move instruction which needs to be fixed. */
-static int
-broken_move (insn)
- rtx insn;
-{
- if (!INSN_DELETED_P (insn)
- && GET_CODE (insn) == INSN
- && GET_CODE (PATTERN (insn)) == SET)
- {
- rtx pat = PATTERN (insn);
- rtx src = SET_SRC (pat);
- rtx dst = SET_DEST (pat);
- int destreg;
- enum machine_mode mode = GET_MODE (dst);
- if (dst == pc_rtx)
- return 0;
-
- if (GET_CODE (dst) == REG)
- destreg = REGNO (dst);
- else if (GET_CODE (dst) == SUBREG && GET_CODE (SUBREG_REG (dst)) == REG)
- destreg = REGNO (SUBREG_REG (dst));
-
- return fixit (src, mode, destreg);
+ default:
+ fprintf (f, "????");
+ return;
}
- return 0;
}
+\f
+/* Routines for manipulation of the constant pool. */
-void
-arm_reorg (first)
- rtx first;
-{
- rtx insn;
- int count_size;
- int regno;
-
-#if 0
- /* The ldr instruction can work with up to a 4k offset, and most constants
- will be loaded with one of these instructions; however, the adr
- instruction and the ldf instructions only work with a 1k offset. This
- code needs to be rewritten to use the 4k offset when possible, and to
- adjust when a 1k offset is needed. For now we just use a 1k offset
- from the start. */
- count_size = 4000;
-
- /* Floating point operands can't work further than 1024 bytes from the
- PC, so to make things simple we restrict all loads for such functions.
- */
- if (TARGET_HARD_FLOAT)
- for (regno = 16; regno < 24; regno++)
- if (regs_ever_live[regno])
- {
- count_size = 1000;
- break;
- }
-#else
- count_size = 1000;
-#endif /* 0 */
+/* Arm instructions cannot load a large constant directly into a
+ register; they have to come from a pc relative load. The constant
+ must therefore be placed in the addressable range of the pc
+ relative load. Depending on the precise pc relative load
+ instruction the range is somewhere between 256 bytes and 4k. This
+ means that we often have to dump a constant inside a function, and
+ generate code to branch around it.
- for (insn = first; insn; insn = NEXT_INSN (insn))
- {
- if (broken_move (insn))
- {
- /* This is a broken move instruction, scan ahead looking for
- a barrier to stick the constant table behind */
- rtx scan;
- rtx barrier = find_barrier (insn, count_size);
+ It is important to minimize this, since the branches will slow
+ things down and make the code larger.
- /* Now find all the moves between the points and modify them */
- for (scan = insn; scan != barrier; scan = NEXT_INSN (scan))
- {
- if (broken_move (scan))
- {
- /* This is a broken move instruction, add it to the pool */
- rtx pat = PATTERN (scan);
- rtx src = SET_SRC (pat);
- rtx dst = SET_DEST (pat);
- enum machine_mode mode = GET_MODE (dst);
- HOST_WIDE_INT offset;
- rtx newinsn = scan;
- rtx newsrc;
- rtx addr;
- int scratch;
-
- /* If this is an HImode constant load, convert it into
- an SImode constant load. Since the register is always
- 32 bits this is safe. We have to do this, since the
- load pc-relative instruction only does a 32-bit load. */
- if (mode == HImode)
- {
- mode = SImode;
- if (GET_CODE (dst) != REG)
- abort ();
- PUT_MODE (dst, SImode);
- }
+ Normally we can hide the table after an existing unconditional
+ branch so that there is no interruption of the flow, but in the
+ worst case the code looks like this:
- offset = add_constant (src, mode);
- addr = plus_constant (gen_rtx (LABEL_REF, VOIDmode,
- pool_vector_label),
- offset);
-
- /* For wide moves to integer regs we need to split the
- address calculation off into a separate insn, so that
- the load can then be done with a load-multiple. This is
- safe, since we have already noted the length of such
- insns to be 8, and we are immediately over-writing the
- scratch we have grabbed with the final result. */
- if (GET_MODE_SIZE (mode) > 4
- && (scratch = REGNO (dst)) < 16)
- {
- rtx reg = gen_rtx (REG, SImode, scratch);
- newinsn = emit_insn_after (gen_movaddr (reg, addr),
- newinsn);
- addr = reg;
- }
+ ldr rn, L1
+ ...
+ b L2
+ align
+ L1: .long value
+ L2:
+ ...
- newsrc = gen_rtx (MEM, mode, addr);
+ ldr rn, L3
+ ...
+ b L4
+ align
+ L3: .long value
+ L4:
+ ...
+
+ We fix this by performing a scan after scheduling, which notices
+ which instructions need to have their operands fetched from the
+ constant table and builds the table.
+
+ The algorithm starts by building a table of all the constants that
+ need fixing up and all the natural barriers in the function (places
+ where a constant table can be dropped without breaking the flow).
+ For each fixup we note how far the pc-relative replacement will be
+ able to reach and the offset of the instruction into the function.
+
+ Having built the table we then group the fixes together to form
+ tables that are as large as possible (subject to addressing
+ constraints) and emit each table of constants after the last
+ barrier that is within range of all the instructions in the group.
+ If a group does not contain a barrier, then we forcibly create one
+ by inserting a jump instruction into the flow. Once the table has
+ been inserted, the insns are then modified to reference the
+ relevant entry in the pool.
+
+ Possible enhancements to the algorithm (not implemented) are:
+
+ 1) For some processors and object formats, there may be benefit in
+ aligning the pools to the start of cache lines; this alignment
+ would need to be taken into account when calculating addressability
+ of a pool. */
+
+/* These typedefs are located at the start of this file, so that
+ they can be used in the prototypes there. This comment is to
+ remind readers of that fact so that the following structures
+ can be understood more easily.
+
+ typedef struct minipool_node Mnode;
+ typedef struct minipool_fixup Mfix; */
+
+struct minipool_node
+{
+ /* Doubly linked chain of entries. */
+ Mnode * next;
+ Mnode * prev;
+ /* The maximum offset into the code that this entry can be placed. While
+ pushing fixes for forward references, all entries are sorted in order
+ of increasing max_address. */
+ HOST_WIDE_INT max_address;
+ /* Similarly for a entry inserted for a backwards ref. */
+ HOST_WIDE_INT min_address;
+ /* The number of fixes referencing this entry. This can become zero
+ if we "unpush" an entry. In this case we ignore the entry when we
+ come to emit the code. */
+ int refcount;
+ /* The offset from the start of the minipool. */
+ HOST_WIDE_INT offset;
+ /* The value in table. */
+ rtx value;
+ /* The mode of value. */
+ enum machine_mode mode;
+ int fix_size;
+};
- /* Build a jump insn wrapper around the move instead
- of an ordinary insn, because we want to have room for
- the target label rtx in fld[7], which an ordinary
- insn doesn't have. */
- newinsn = emit_jump_insn_after (gen_rtx (SET, VOIDmode,
- dst, newsrc),
- newinsn);
- JUMP_LABEL (newinsn) = pool_vector_label;
+struct minipool_fixup
+{
+ Mfix * next;
+ rtx insn;
+ HOST_WIDE_INT address;
+ rtx * loc;
+ enum machine_mode mode;
+ int fix_size;
+ rtx value;
+ Mnode * minipool;
+ HOST_WIDE_INT forwards;
+ HOST_WIDE_INT backwards;
+};
- /* But it's still an ordinary insn */
- PUT_CODE (newinsn, INSN);
+/* Fixes less than a word need padding out to a word boundary. */
+#define MINIPOOL_FIX_SIZE(mode) \
+ (GET_MODE_SIZE ((mode)) >= 4 ? GET_MODE_SIZE ((mode)) : 4)
- /* Kill old insn */
- delete_insn (scan);
- scan = newinsn;
- }
- }
- dump_table (barrier);
- insn = scan;
- }
- }
-}
+static Mnode * minipool_vector_head;
+static Mnode * minipool_vector_tail;
+static rtx minipool_vector_label;
-\f
-/* Routines to output assembly language. */
+/* The linked list of all minipool fixes required for this function. */
+Mfix * minipool_fix_head;
+Mfix * minipool_fix_tail;
+/* The fix entry for the current minipool, once it has been placed. */
+Mfix * minipool_barrier;
-/* If the rtx is the correct value then return the string of the number.
- In this way we can ensure that valid double constants are generated even
- when cross compiling. */
-char *
-fp_immediate_constant (x)
- rtx x;
+/* Determines if INSN is the start of a jump table. Returns the end
+ of the TABLE or NULL_RTX. */
+static rtx
+is_jump_table (insn)
+ rtx insn;
{
- REAL_VALUE_TYPE r;
- int i;
-
- if (!fpa_consts_inited)
- init_fpa_table ();
+ rtx table;
- REAL_VALUE_FROM_CONST_DOUBLE (r, x);
- for (i = 0; i < 8; i++)
- if (REAL_VALUES_EQUAL (r, values_fpa[i]))
- return strings_fpa[i];
-
- abort ();
+ if (GET_CODE (insn) == JUMP_INSN
+ && JUMP_LABEL (insn) != NULL
+ && ((table = next_real_insn (JUMP_LABEL (insn)))
+ == next_real_insn (insn))
+ && table != NULL
+ && GET_CODE (table) == JUMP_INSN
+ && (GET_CODE (PATTERN (table)) == ADDR_VEC
+ || GET_CODE (PATTERN (table)) == ADDR_DIFF_VEC))
+ return table;
+
+ return NULL_RTX;
}
-/* As for fp_immediate_constant, but value is passed directly, not in rtx. */
-static char *
-fp_const_from_val (r)
- REAL_VALUE_TYPE *r;
+static HOST_WIDE_INT
+get_jump_table_size (insn)
+ rtx insn;
{
- int i;
-
- if (! fpa_consts_inited)
- init_fpa_table ();
-
- for (i = 0; i < 8; i++)
- if (REAL_VALUES_EQUAL (*r, values_fpa[i]))
- return strings_fpa[i];
+ rtx body = PATTERN (insn);
+ int elt = GET_CODE (body) == ADDR_DIFF_VEC ? 1 : 0;
- abort ();
+ return GET_MODE_SIZE (GET_MODE (body)) * XVECLEN (body, elt);
}
-/* Output the operands of a LDM/STM instruction to STREAM.
- MASK is the ARM register set mask of which only bits 0-15 are important.
- INSTR is the possibly suffixed base register. HAT unequals zero if a hat
- must follow the register list. */
-
-void
-print_multi_reg (stream, instr, mask, hat)
- FILE *stream;
- char *instr;
- int mask, hat;
+/* Move a minipool fix MP from its current location to before MAX_MP.
+ If MAX_MP is NULL, then MP doesn't need moving, but the addressing
+ contrains may need updating. */
+static Mnode *
+move_minipool_fix_forward_ref (mp, max_mp, max_address)
+ Mnode * mp;
+ Mnode * max_mp;
+ HOST_WIDE_INT max_address;
{
- int i;
- int not_first = FALSE;
+ /* This should never be true and the code below assumes these are
+ different. */
+ if (mp == max_mp)
+ abort ();
- fputc ('\t', stream);
- fprintf (stream, instr, REGISTER_PREFIX);
- fputs (", {", stream);
- for (i = 0; i < 16; i++)
- if (mask & (1 << i))
- {
- if (not_first)
- fprintf (stream, ", ");
- fprintf (stream, "%s%s", REGISTER_PREFIX, reg_names[i]);
- not_first = TRUE;
- }
+ if (max_mp == NULL)
+ {
+ if (max_address < mp->max_address)
+ mp->max_address = max_address;
+ }
+ else
+ {
+ if (max_address > max_mp->max_address - mp->fix_size)
+ mp->max_address = max_mp->max_address - mp->fix_size;
+ else
+ mp->max_address = max_address;
- fprintf (stream, "}%s\n", hat ? "^" : "");
-}
+ /* Unlink MP from its current position. Since max_mp is non-null,
+ mp->prev must be non-null. */
+ mp->prev->next = mp->next;
+ if (mp->next != NULL)
+ mp->next->prev = mp->prev;
+ else
+ minipool_vector_tail = mp->prev;
-/* Output a 'call' insn. */
+ /* Re-insert it before MAX_MP. */
+ mp->next = max_mp;
+ mp->prev = max_mp->prev;
+ max_mp->prev = mp;
+
+ if (mp->prev != NULL)
+ mp->prev->next = mp;
+ else
+ minipool_vector_head = mp;
+ }
-char *
-output_call (operands)
- rtx *operands;
-{
- /* Handle calls to lr using ip (which may be clobbered in subr anyway). */
+ /* Save the new entry. */
+ max_mp = mp;
- if (REGNO (operands[0]) == 14)
+ /* Scan over the preceeding entries and adjust their addresses as
+ required. */
+ while (mp->prev != NULL
+ && mp->prev->max_address > mp->max_address - mp->prev->fix_size)
{
- operands[0] = gen_rtx (REG, SImode, 12);
- output_asm_insn ("mov%?\t%0, %|lr", operands);
+ mp->prev->max_address = mp->max_address - mp->prev->fix_size;
+ mp = mp->prev;
}
- output_asm_insn ("mov%?\t%|lr, %|pc", operands);
- output_asm_insn ("mov%?\t%|pc, %0", operands);
- return "";
+
+ return max_mp;
}
-static int
-eliminate_lr2ip (x)
- rtx *x;
+/* Add a constant to the minipool for a forward reference. Returns the
+ node added or NULL if the constant will not fit in this pool. */
+static Mnode *
+add_minipool_forward_ref (fix)
+ Mfix * fix;
{
- int something_changed = 0;
- rtx x0 = *x;
- int code = GET_CODE (x0);
- register int i, j;
- register char *fmt;
+ /* If set, max_mp is the first pool_entry that has a lower
+ constraint than the one we are trying to add. */
+ Mnode * max_mp = NULL;
+ HOST_WIDE_INT max_address = fix->address + fix->forwards;
+ Mnode * mp;
- switch (code)
+ /* If this fix's address is greater than the address of the first
+ entry, then we can't put the fix in this pool. We subtract the
+ size of the current fix to ensure that if the table is fully
+ packed we still have enough room to insert this value by suffling
+ the other fixes forwards. */
+ if (minipool_vector_head &&
+ fix->address >= minipool_vector_head->max_address - fix->fix_size)
+ return NULL;
+
+ /* Scan the pool to see if a constant with the same value has
+ already been added. While we are doing this, also note the
+ location where we must insert the constant if it doesn't already
+ exist. */
+ for (mp = minipool_vector_head; mp != NULL; mp = mp->next)
{
- case REG:
- if (REGNO (x0) == 14)
- {
- *x = gen_rtx (REG, SImode, 12);
- return 1;
- }
- return 0;
- default:
- /* Scan through the sub-elements and change any references there */
- fmt = GET_RTX_FORMAT (code);
- for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
- if (fmt[i] == 'e')
- something_changed |= eliminate_lr2ip (&XEXP (x0, i));
- else if (fmt[i] == 'E')
- for (j = 0; j < XVECLEN (x0, i); j++)
- something_changed |= eliminate_lr2ip (&XVECEXP (x0, i, j));
- return something_changed;
+ if (GET_CODE (fix->value) == GET_CODE (mp->value)
+ && fix->mode == mp->mode
+ && (GET_CODE (fix->value) != CODE_LABEL
+ || (CODE_LABEL_NUMBER (fix->value)
+ == CODE_LABEL_NUMBER (mp->value)))
+ && rtx_equal_p (fix->value, mp->value))
+ {
+ /* More than one fix references this entry. */
+ mp->refcount++;
+ return move_minipool_fix_forward_ref (mp, max_mp, max_address);
+ }
+
+ /* Note the insertion point if necessary. */
+ if (max_mp == NULL
+ && mp->max_address > max_address)
+ max_mp = mp;
}
-}
-
-/* Output a 'call' insn that is a reference in memory. */
-char *
-output_call_mem (operands)
- rtx *operands;
-{
- operands[0] = copy_rtx (operands[0]); /* Be ultra careful */
- /* Handle calls using lr by using ip (which may be clobbered in subr anyway).
- */
- if (eliminate_lr2ip (&operands[0]))
- output_asm_insn ("mov%?\t%|ip, %|lr", operands);
+ /* The value is not currently in the minipool, so we need to create
+ a new entry for it. If MAX_MP is NULL, the entry will be put on
+ the end of the list since the placement is less constrained than
+ any existing entry. Otherwise, we insert the new fix before
+ MAX_MP and, if neceesary, adjust the constraints on the other
+ entries. */
+ mp = xmalloc (sizeof (* mp));
+ mp->fix_size = fix->fix_size;
+ mp->mode = fix->mode;
+ mp->value = fix->value;
+ mp->refcount = 1;
+ /* Not yet required for a backwards ref. */
+ mp->min_address = -65536;
+
+ if (max_mp == NULL)
+ {
+ mp->max_address = max_address;
+ mp->next = NULL;
+ mp->prev = minipool_vector_tail;
- output_asm_insn ("mov%?\t%|lr, %|pc", operands);
- output_asm_insn ("ldr%?\t%|pc, %0", operands);
- return "";
-}
+ if (mp->prev == NULL)
+ {
+ minipool_vector_head = mp;
+ minipool_vector_label = gen_label_rtx ();
+ }
+ else
+ mp->prev->next = mp;
+ minipool_vector_tail = mp;
+ }
+ else
+ {
+ if (max_address > max_mp->max_address - mp->fix_size)
+ mp->max_address = max_mp->max_address - mp->fix_size;
+ else
+ mp->max_address = max_address;
-/* Output a move from arm registers to an fpu registers.
- OPERANDS[0] is an fpu register.
- OPERANDS[1] is the first registers of an arm register pair. */
+ mp->next = max_mp;
+ mp->prev = max_mp->prev;
+ max_mp->prev = mp;
+ if (mp->prev != NULL)
+ mp->prev->next = mp;
+ else
+ minipool_vector_head = mp;
+ }
-char *
-output_mov_long_double_fpu_from_arm (operands)
- rtx *operands;
-{
- int arm_reg0 = REGNO (operands[1]);
- rtx ops[3];
+ /* Save the new entry. */
+ max_mp = mp;
- if (arm_reg0 == 12)
- abort();
+ /* Scan over the preceeding entries and adjust their addresses as
+ required. */
+ while (mp->prev != NULL
+ && mp->prev->max_address > mp->max_address - mp->prev->fix_size)
+ {
+ mp->prev->max_address = mp->max_address - mp->prev->fix_size;
+ mp = mp->prev;
+ }
- ops[0] = gen_rtx (REG, SImode, arm_reg0);
- ops[1] = gen_rtx (REG, SImode, 1 + arm_reg0);
- ops[2] = gen_rtx (REG, SImode, 2 + arm_reg0);
-
- output_asm_insn ("stm%?fd\t%|sp!, {%0, %1, %2}", ops);
- output_asm_insn ("ldf%?e\t%0, [%|sp], #12", operands);
- return "";
+ return max_mp;
}
-/* Output a move from an fpu register to arm registers.
- OPERANDS[0] is the first registers of an arm register pair.
- OPERANDS[1] is an fpu register. */
-
-char *
-output_mov_long_double_arm_from_fpu (operands)
- rtx *operands;
+static Mnode *
+move_minipool_fix_backward_ref (mp, min_mp, min_address)
+ Mnode * mp;
+ Mnode * min_mp;
+ HOST_WIDE_INT min_address;
{
- int arm_reg0 = REGNO (operands[0]);
- rtx ops[3];
+ HOST_WIDE_INT offset;
+
+ /* This should never be true, and the code below assumes these are
+ different. */
+ if (mp == min_mp)
+ abort ();
+
+ if (min_mp == NULL)
+ {
+ if (min_address > mp->min_address)
+ mp->min_address = min_address;
+ }
+ else
+ {
+ /* We will adjust this below if it is too loose. */
+ mp->min_address = min_address;
+
+ /* Unlink MP from its current position. Since min_mp is non-null,
+ mp->next must be non-null. */
+ mp->next->prev = mp->prev;
+ if (mp->prev != NULL)
+ mp->prev->next = mp->next;
+ else
+ minipool_vector_head = mp->next;
+
+ /* Reinsert it after MIN_MP. */
+ mp->prev = min_mp;
+ mp->next = min_mp->next;
+ min_mp->next = mp;
+ if (mp->next != NULL)
+ mp->next->prev = mp;
+ else
+ minipool_vector_tail = mp;
+ }
- if (arm_reg0 == 12)
- abort();
+ min_mp = mp;
- ops[0] = gen_rtx (REG, SImode, arm_reg0);
- ops[1] = gen_rtx (REG, SImode, 1 + arm_reg0);
- ops[2] = gen_rtx (REG, SImode, 2 + arm_reg0);
+ offset = 0;
+ for (mp = minipool_vector_head; mp != NULL; mp = mp->next)
+ {
+ mp->offset = offset;
+ if (mp->refcount > 0)
+ offset += mp->fix_size;
- output_asm_insn ("stf%?e\t%1, [%|sp, #-12]!", operands);
- output_asm_insn ("ldm%?fd\t%|sp!, {%0, %1, %2}", ops);
- return "";
-}
+ if (mp->next && mp->next->min_address < mp->min_address + mp->fix_size)
+ mp->next->min_address = mp->min_address + mp->fix_size;
+ }
-/* Output a move from arm registers to arm registers of a long double
- OPERANDS[0] is the destination.
- OPERANDS[1] is the source. */
-char *
-output_mov_long_double_arm_from_arm (operands)
- rtx *operands;
+ return min_mp;
+}
+
+/* Add a constant to the minipool for a backward reference. Returns the
+ node added or NULL if the constant will not fit in this pool.
+
+ Note that the code for insertion for a backwards reference can be
+ somewhat confusing because the calculated offsets for each fix do
+ not take into account the size of the pool (which is still under
+ construction. */
+static Mnode *
+add_minipool_backward_ref (fix)
+ Mfix * fix;
{
- /* We have to be careful here because the two might overlap */
- int dest_start = REGNO (operands[0]);
- int src_start = REGNO (operands[1]);
- rtx ops[2];
- int i;
+ /* If set, min_mp is the last pool_entry that has a lower constraint
+ than the one we are trying to add. */
+ Mnode * min_mp = NULL;
+ /* This can be negative, since it is only a constraint. */
+ HOST_WIDE_INT min_address = fix->address - fix->backwards;
+ Mnode * mp;
+
+ /* If we can't reach the current pool from this insn, or if we can't
+ insert this entry at the end of the pool without pushing other
+ fixes out of range, then we don't try. This ensures that we
+ can't fail later on. */
+ if (min_address >= minipool_barrier->address
+ || (minipool_vector_tail->min_address + fix->fix_size
+ >= minipool_barrier->address))
+ return NULL;
- if (dest_start < src_start)
+ /* Scan the pool to see if a constant with the same value has
+ already been added. While we are doing this, also note the
+ location where we must insert the constant if it doesn't already
+ exist. */
+ for (mp = minipool_vector_tail; mp != NULL; mp = mp->prev)
{
- for (i = 0; i < 3; i++)
+ if (GET_CODE (fix->value) == GET_CODE (mp->value)
+ && fix->mode == mp->mode
+ && (GET_CODE (fix->value) != CODE_LABEL
+ || (CODE_LABEL_NUMBER (fix->value)
+ == CODE_LABEL_NUMBER (mp->value)))
+ && rtx_equal_p (fix->value, mp->value)
+ /* Check that there is enough slack to move this entry to the
+ end of the table (this is conservative). */
+ && (mp->max_address
+ > (minipool_barrier->address
+ + minipool_vector_tail->offset
+ + minipool_vector_tail->fix_size)))
{
- ops[0] = gen_rtx (REG, SImode, dest_start + i);
- ops[1] = gen_rtx (REG, SImode, src_start + i);
- output_asm_insn ("mov%?\t%0, %1", ops);
+ mp->refcount++;
+ return move_minipool_fix_backward_ref (mp, min_mp, min_address);
}
- }
- else
- {
- for (i = 2; i >= 0; i--)
+
+ if (min_mp != NULL)
+ mp->min_address += fix->fix_size;
+ else
{
- ops[0] = gen_rtx (REG, SImode, dest_start + i);
- ops[1] = gen_rtx (REG, SImode, src_start + i);
- output_asm_insn ("mov%?\t%0, %1", ops);
+ /* Note the insertion point if necessary. */
+ if (mp->min_address < min_address)
+ min_mp = mp;
+ else if (mp->max_address
+ < minipool_barrier->address + mp->offset + fix->fix_size)
+ {
+ /* Inserting before this entry would push the fix beyond
+ its maximum address (which can happen if we have
+ re-located a forwards fix); force the new fix to come
+ after it. */
+ min_mp = mp;
+ min_address = mp->min_address + fix->fix_size;
+ }
}
}
- return "";
-}
+ /* We need to create a new entry. */
+ mp = xmalloc (sizeof (* mp));
+ mp->fix_size = fix->fix_size;
+ mp->mode = fix->mode;
+ mp->value = fix->value;
+ mp->refcount = 1;
+ mp->max_address = minipool_barrier->address + 65536;
+ mp->min_address = min_address;
-/* Output a move from arm registers to an fpu registers.
- OPERANDS[0] is an fpu register.
- OPERANDS[1] is the first registers of an arm register pair. */
+ if (min_mp == NULL)
+ {
+ mp->prev = NULL;
+ mp->next = minipool_vector_head;
-char *
-output_mov_double_fpu_from_arm (operands)
- rtx *operands;
-{
- int arm_reg0 = REGNO (operands[1]);
- rtx ops[2];
+ if (mp->next == NULL)
+ {
+ minipool_vector_tail = mp;
+ minipool_vector_label = gen_label_rtx ();
+ }
+ else
+ mp->next->prev = mp;
- if (arm_reg0 == 12)
- abort();
- ops[0] = gen_rtx (REG, SImode, arm_reg0);
- ops[1] = gen_rtx (REG, SImode, 1 + arm_reg0);
- output_asm_insn ("stm%?fd\t%|sp!, {%0, %1}", ops);
- output_asm_insn ("ldf%?d\t%0, [%|sp], #8", operands);
- return "";
-}
+ minipool_vector_head = mp;
+ }
+ else
+ {
+ mp->next = min_mp->next;
+ mp->prev = min_mp;
+ min_mp->next = mp;
+
+ if (mp->next != NULL)
+ mp->next->prev = mp;
+ else
+ minipool_vector_tail = mp;
+ }
-/* Output a move from an fpu register to arm registers.
- OPERANDS[0] is the first registers of an arm register pair.
- OPERANDS[1] is an fpu register. */
+ /* Save the new entry. */
+ min_mp = mp;
-char *
-output_mov_double_arm_from_fpu (operands)
- rtx *operands;
-{
- int arm_reg0 = REGNO (operands[0]);
- rtx ops[2];
+ if (mp->prev)
+ mp = mp->prev;
+ else
+ mp->offset = 0;
- if (arm_reg0 == 12)
- abort();
+ /* Scan over the following entries and adjust their offsets. */
+ while (mp->next != NULL)
+ {
+ if (mp->next->min_address < mp->min_address + mp->fix_size)
+ mp->next->min_address = mp->min_address + mp->fix_size;
- ops[0] = gen_rtx (REG, SImode, arm_reg0);
- ops[1] = gen_rtx (REG, SImode, 1 + arm_reg0);
- output_asm_insn ("stf%?d\t%1, [%|sp, #-8]!", operands);
- output_asm_insn ("ldm%?fd\t%|sp!, {%0, %1}", ops);
- return "";
-}
+ if (mp->refcount)
+ mp->next->offset = mp->offset + mp->fix_size;
+ else
+ mp->next->offset = mp->offset;
-/* Output a move between double words.
- It must be REG<-REG, REG<-CONST_DOUBLE, REG<-CONST_INT, REG<-MEM
- or MEM<-REG and all MEMs must be offsettable addresses. */
+ mp = mp->next;
+ }
-char *
-output_move_double (operands)
- rtx *operands;
+ return min_mp;
+}
+
+static void
+assign_minipool_offsets (barrier)
+ Mfix * barrier;
{
- enum rtx_code code0 = GET_CODE (operands[0]);
- enum rtx_code code1 = GET_CODE (operands[1]);
- rtx otherops[2];
+ HOST_WIDE_INT offset = 0;
+ Mnode * mp;
- if (code0 == REG)
+ minipool_barrier = barrier;
+
+ for (mp = minipool_vector_head; mp != NULL; mp = mp->next)
{
- int reg0 = REGNO (operands[0]);
+ mp->offset = offset;
+
+ if (mp->refcount > 0)
+ offset += mp->fix_size;
+ }
+}
- otherops[0] = gen_rtx (REG, SImode, 1 + reg0);
- if (code1 == REG)
- {
- int reg1 = REGNO (operands[1]);
- if (reg1 == 12)
- abort();
+/* Output the literal table */
+static void
+dump_minipool (scan)
+ rtx scan;
+{
+ Mnode * mp;
+ Mnode * nmp;
- /* Ensure the second source is not overwritten */
- if (reg1 == reg0 + (WORDS_BIG_ENDIAN ? -1 : 1))
- output_asm_insn("mov%?\t%Q0, %Q1\n\tmov%?\t%R0, %R1", operands);
- else
- output_asm_insn("mov%?\t%R0, %R1\n\tmov%?\t%Q0, %Q1", operands);
- }
- else if (code1 == CONST_DOUBLE)
- {
- if (GET_MODE (operands[1]) == DFmode)
- {
- long l[2];
- union real_extract u;
+ if (rtl_dump_file)
+ fprintf (rtl_dump_file,
+ ";; Emitting minipool after insn %u; address %ld\n",
+ INSN_UID (scan), (unsigned long) minipool_barrier->address);
- bcopy ((char *) &CONST_DOUBLE_LOW (operands[1]), (char *) &u,
- sizeof (u));
- REAL_VALUE_TO_TARGET_DOUBLE (u.d, l);
- otherops[1] = GEN_INT(l[1]);
- operands[1] = GEN_INT(l[0]);
- }
- else if (GET_MODE (operands[1]) != VOIDmode)
- abort ();
- else if (WORDS_BIG_ENDIAN)
- {
-
- otherops[1] = GEN_INT (CONST_DOUBLE_LOW (operands[1]));
- operands[1] = GEN_INT (CONST_DOUBLE_HIGH (operands[1]));
- }
- else
- {
-
- otherops[1] = GEN_INT (CONST_DOUBLE_HIGH (operands[1]));
- operands[1] = GEN_INT (CONST_DOUBLE_LOW (operands[1]));
- }
- output_mov_immediate (operands);
- output_mov_immediate (otherops);
- }
- else if (code1 == CONST_INT)
+ scan = emit_label_after (gen_label_rtx (), scan);
+ scan = emit_insn_after (gen_align_4 (), scan);
+ scan = emit_label_after (minipool_vector_label, scan);
+
+ for (mp = minipool_vector_head; mp != NULL; mp = nmp)
+ {
+ if (mp->refcount > 0)
{
- /* sign extend the intval into the high-order word */
- if (WORDS_BIG_ENDIAN)
+ if (rtl_dump_file)
{
- otherops[1] = operands[1];
- operands[1] = (INTVAL (operands[1]) < 0
- ? constm1_rtx : const0_rtx);
+ fprintf (rtl_dump_file,
+ ";; Offset %u, min %ld, max %ld ",
+ (unsigned) mp->offset, (unsigned long) mp->min_address,
+ (unsigned long) mp->max_address);
+ arm_print_value (rtl_dump_file, mp->value);
+ fputc ('\n', rtl_dump_file);
}
- else
- otherops[1] = INTVAL (operands[1]) < 0 ? constm1_rtx : const0_rtx;
- output_mov_immediate (otherops);
- output_mov_immediate (operands);
- }
- else if (code1 == MEM)
- {
- switch (GET_CODE (XEXP (operands[1], 0)))
- {
- case REG:
- output_asm_insn ("ldm%?ia\t%m1, %M0", operands);
- break;
-
- case PRE_INC:
- abort (); /* Should never happen now */
- break;
- case PRE_DEC:
- output_asm_insn ("ldm%?db\t%m1!, %M0", operands);
+ switch (mp->fix_size)
+ {
+#ifdef HAVE_consttable_1
+ case 1:
+ scan = emit_insn_after (gen_consttable_1 (mp->value), scan);
break;
- case POST_INC:
- output_asm_insn ("ldm%?ia\t%m1!, %M0", operands);
+#endif
+#ifdef HAVE_consttable_2
+ case 2:
+ scan = emit_insn_after (gen_consttable_2 (mp->value), scan);
break;
- case POST_DEC:
- abort (); /* Should never happen now */
+#endif
+#ifdef HAVE_consttable_4
+ case 4:
+ scan = emit_insn_after (gen_consttable_4 (mp->value), scan);
break;
- case LABEL_REF:
- case CONST:
- output_asm_insn ("adr%?\t%0, %1", operands);
- output_asm_insn ("ldm%?ia\t%0, %M0", operands);
+#endif
+#ifdef HAVE_consttable_8
+ case 8:
+ scan = emit_insn_after (gen_consttable_8 (mp->value), scan);
break;
+#endif
default:
- if (arm_add_operand (XEXP (XEXP (operands[1], 0), 1)))
- {
- otherops[0] = operands[0];
- otherops[1] = XEXP (XEXP (operands[1], 0), 0);
- otherops[2] = XEXP (XEXP (operands[1], 0), 1);
- if (GET_CODE (XEXP (operands[1], 0)) == PLUS)
- {
- if (GET_CODE (otherops[2]) == CONST_INT)
- {
- switch (INTVAL (otherops[2]))
- {
- case -8:
- output_asm_insn ("ldm%?db\t%1, %M0", otherops);
- return "";
- case -4:
- output_asm_insn ("ldm%?da\t%1, %M0", otherops);
- return "";
- case 4:
- output_asm_insn ("ldm%?ib\t%1, %M0", otherops);
- return "";
- }
- if (!(const_ok_for_arm (INTVAL (otherops[2]))))
- output_asm_insn ("sub%?\t%0, %1, #%n2", otherops);
- else
- output_asm_insn ("add%?\t%0, %1, %2", otherops);
- }
- else
- output_asm_insn ("add%?\t%0, %1, %2", otherops);
- }
- else
- output_asm_insn ("sub%?\t%0, %1, %2", otherops);
- return "ldm%?ia\t%0, %M0";
- }
- else
- {
- otherops[1] = adj_offsettable_operand (operands[1], 4);
- /* Take care of overlapping base/data reg. */
- if (reg_mentioned_p (operands[0], operands[1]))
- {
- output_asm_insn ("ldr%?\t%0, %1", otherops);
- output_asm_insn ("ldr%?\t%0, %1", operands);
- }
- else
- {
- output_asm_insn ("ldr%?\t%0, %1", operands);
- output_asm_insn ("ldr%?\t%0, %1", otherops);
- }
- }
+ abort ();
+ break;
}
}
- else
- abort(); /* Constraints should prevent this */
+
+ nmp = mp->next;
+ free (mp);
}
- else if (code0 == MEM && code1 == REG)
+
+ minipool_vector_head = minipool_vector_tail = NULL;
+ scan = emit_insn_after (gen_consttable_end (), scan);
+ scan = emit_barrier_after (scan);
+}
+
+/* Return the cost of forcibly inserting a barrier after INSN. */
+static int
+arm_barrier_cost (insn)
+ rtx insn;
+{
+ /* Basing the location of the pool on the loop depth is preferable,
+ but at the moment, the basic block information seems to be
+ corrupt by this stage of the compilation. */
+ int base_cost = 50;
+ rtx next = next_nonnote_insn (insn);
+
+ if (next != NULL && GET_CODE (next) == CODE_LABEL)
+ base_cost -= 20;
+
+ switch (GET_CODE (insn))
{
- if (REGNO (operands[1]) == 12)
- abort();
+ case CODE_LABEL:
+ /* It will always be better to place the table before the label, rather
+ than after it. */
+ return 50;
- switch (GET_CODE (XEXP (operands[0], 0)))
- {
- case REG:
- output_asm_insn ("stm%?ia\t%m0, %M1", operands);
- break;
+ case INSN:
+ case CALL_INSN:
+ return base_cost;
- case PRE_INC:
- abort (); /* Should never happen now */
- break;
+ case JUMP_INSN:
+ return base_cost - 10;
- case PRE_DEC:
- output_asm_insn ("stm%?db\t%m0!, %M1", operands);
- break;
+ default:
+ return base_cost + 10;
+ }
+}
- case POST_INC:
- output_asm_insn ("stm%?ia\t%m0!, %M1", operands);
- break;
+/* Find the best place in the insn stream in the range
+ (FIX->address,MAX_ADDRESS) to forcibly insert a minipool barrier.
+ Create the barrier by inserting a jump and add a new fix entry for
+ it. */
+static Mfix *
+create_fix_barrier (fix, max_address)
+ Mfix * fix;
+ HOST_WIDE_INT max_address;
+{
+ HOST_WIDE_INT count = 0;
+ rtx barrier;
+ rtx from = fix->insn;
+ rtx selected = from;
+ int selected_cost;
+ HOST_WIDE_INT selected_address;
+ Mfix * new_fix;
+ HOST_WIDE_INT max_count = max_address - fix->address;
+ rtx label = gen_label_rtx ();
+
+ selected_cost = arm_barrier_cost (from);
+ selected_address = fix->address;
- case POST_DEC:
- abort (); /* Should never happen now */
- break;
+ while (from && count < max_count)
+ {
+ rtx tmp;
+ int new_cost;
- case PLUS:
- if (GET_CODE (XEXP (XEXP (operands[0], 0), 1)) == CONST_INT)
- {
- switch (INTVAL (XEXP (XEXP (operands[0], 0), 1)))
- {
- case -8:
- output_asm_insn ("stm%?db\t%m0, %M1", operands);
- return "";
+ /* This code shouldn't have been called if there was a natural barrier
+ within range. */
+ if (GET_CODE (from) == BARRIER)
+ abort ();
- case -4:
- output_asm_insn ("stm%?da\t%m0, %M1", operands);
- return "";
+ /* Count the length of this insn. */
+ count += get_attr_length (from);
- case 4:
- output_asm_insn ("stm%?ib\t%m0, %M1", operands);
- return "";
- }
+ /* If there is a jump table, add its length. */
+ tmp = is_jump_table (from);
+ if (tmp != NULL)
+ {
+ count += get_jump_table_size (tmp);
+
+ /* Jump tables aren't in a basic block, so base the cost on
+ the dispatch insn. If we select this location, we will
+ still put the pool after the table. */
+ new_cost = arm_barrier_cost (from);
+
+ if (count < max_count && new_cost <= selected_cost)
+ {
+ selected = tmp;
+ selected_cost = new_cost;
+ selected_address = fix->address + count;
}
- /* Fall through */
- default:
- otherops[0] = adj_offsettable_operand (operands[0], 4);
- otherops[1] = gen_rtx (REG, SImode, 1 + REGNO (operands[1]));
- output_asm_insn ("str%?\t%1, %0", operands);
- output_asm_insn ("str%?\t%1, %0", otherops);
+ /* Continue after the dispatch table. */
+ from = NEXT_INSN (tmp);
+ continue;
}
- }
- else
- abort(); /* Constraints should prevent this */
-
- return "";
-}
+ new_cost = arm_barrier_cost (from);
+
+ if (count < max_count && new_cost <= selected_cost)
+ {
+ selected = from;
+ selected_cost = new_cost;
+ selected_address = fix->address + count;
+ }
-/* Output an arbitrary MOV reg, #n.
- OPERANDS[0] is a register. OPERANDS[1] is a const_int. */
+ from = NEXT_INSN (from);
+ }
-char *
-output_mov_immediate (operands)
- rtx *operands;
-{
- HOST_WIDE_INT n = INTVAL (operands[1]);
- int n_ones = 0;
- int i;
+ /* Create a new JUMP_INSN that branches around a barrier. */
+ from = emit_jump_insn_after (gen_jump (label), selected);
+ JUMP_LABEL (from) = label;
+ barrier = emit_barrier_after (from);
+ emit_label_after (label, barrier);
- /* Try to use one MOV */
- if (const_ok_for_arm (n))
- {
- output_asm_insn ("mov%?\t%0, %1", operands);
- return "";
- }
+ /* Create a minipool barrier entry for the new barrier. */
+ new_fix = (Mfix *) oballoc (sizeof (* new_fix));
+ new_fix->insn = barrier;
+ new_fix->address = selected_address;
+ new_fix->next = fix->next;
+ fix->next = new_fix;
- /* Try to use one MVN */
- if (const_ok_for_arm (~n))
- {
- operands[1] = GEN_INT (~n);
- output_asm_insn ("mvn%?\t%0, %1", operands);
- return "";
- }
+ return new_fix;
+}
- /* If all else fails, make it out of ORRs or BICs as appropriate. */
+/* Record that there is a natural barrier in the insn stream at
+ ADDRESS. */
+static void
+push_minipool_barrier (insn, address)
+ rtx insn;
+ HOST_WIDE_INT address;
+{
+ Mfix * fix = (Mfix *) oballoc (sizeof (* fix));
- for (i=0; i < 32; i++)
- if (n & 1 << i)
- n_ones++;
+ fix->insn = insn;
+ fix->address = address;
- if (n_ones > 16) /* Shorter to use MVN with BIC in this case. */
- output_multi_immediate(operands, "mvn%?\t%0, %1", "bic%?\t%0, %0, %1", 1,
- ~n);
+ fix->next = NULL;
+ if (minipool_fix_head != NULL)
+ minipool_fix_tail->next = fix;
else
- output_multi_immediate(operands, "mov%?\t%0, %1", "orr%?\t%0, %0, %1", 1,
- n);
+ minipool_fix_head = fix;
- return "";
+ minipool_fix_tail = fix;
}
+/* Record INSN, which will need fixing up to load a value from the
+ minipool. ADDRESS is the offset of the insn since the start of the
+ function; LOC is a pointer to the part of the insn which requires
+ fixing; VALUE is the constant that must be loaded, which is of type
+ MODE. */
+static void
+push_minipool_fix (insn, address, loc, mode, value)
+ rtx insn;
+ HOST_WIDE_INT address;
+ rtx * loc;
+ enum machine_mode mode;
+ rtx value;
+{
+ Mfix * fix = (Mfix *) oballoc (sizeof (* fix));
-/* Output an ADD r, s, #n where n may be too big for one instruction. If
- adding zero to one register, output nothing. */
+#ifdef AOF_ASSEMBLER
+ /* PIC symbol refereneces need to be converted into offsets into the
+ based area. */
+ /* XXX This shouldn't be done here. */
+ if (flag_pic && GET_CODE (value) == SYMBOL_REF)
+ value = aof_pic_entry (value);
+#endif /* AOF_ASSEMBLER */
-char *
-output_add_immediate (operands)
- rtx *operands;
-{
- HOST_WIDE_INT n = INTVAL (operands[2]);
+ fix->insn = insn;
+ fix->address = address;
+ fix->loc = loc;
+ fix->mode = mode;
+ fix->fix_size = MINIPOOL_FIX_SIZE (mode);
+ fix->value = value;
+ fix->forwards = get_attr_pool_range (insn);
+ fix->backwards = get_attr_neg_pool_range (insn);
+ fix->minipool = NULL;
+
+ /* If an insn doesn't have a range defined for it, then it isn't
+ expecting to be reworked by this code. Better to abort now than
+ to generate duff assembly code. */
+ if (fix->forwards == 0 && fix->backwards == 0)
+ abort ();
- if (n != 0 || REGNO (operands[0]) != REGNO (operands[1]))
+ if (rtl_dump_file)
{
- if (n < 0)
- output_multi_immediate (operands,
- "sub%?\t%0, %1, %2", "sub%?\t%0, %0, %2", 2,
- -n);
- else
- output_multi_immediate (operands,
- "add%?\t%0, %1, %2", "add%?\t%0, %0, %2", 2,
- n);
+ fprintf (rtl_dump_file,
+ ";; %smode fixup for i%d; addr %lu, range (%ld,%ld): ",
+ GET_MODE_NAME (mode),
+ INSN_UID (insn), (unsigned long) address,
+ -1 * (long)fix->backwards, (long)fix->forwards);
+ arm_print_value (rtl_dump_file, fix->value);
+ fprintf (rtl_dump_file, "\n");
}
- return "";
-}
-
-/* Output a multiple immediate operation.
- OPERANDS is the vector of operands referred to in the output patterns.
- INSTR1 is the output pattern to use for the first constant.
- INSTR2 is the output pattern to use for subsequent constants.
- IMMED_OP is the index of the constant slot in OPERANDS.
- N is the constant value. */
-
-char *
-output_multi_immediate (operands, instr1, instr2, immed_op, n)
- rtx *operands;
- char *instr1, *instr2;
- int immed_op;
- HOST_WIDE_INT n;
-{
-#if HOST_BITS_PER_WIDE_INT > 32
- n &= 0xffffffff;
-#endif
-
- if (n == 0)
- {
- operands[immed_op] = const0_rtx;
- output_asm_insn (instr1, operands); /* Quick and easy output */
- }
+ /* Add it to the chain of fixes. */
+ fix->next = NULL;
+
+ if (minipool_fix_head != NULL)
+ minipool_fix_tail->next = fix;
else
- {
- int i;
- char *instr = instr1;
+ minipool_fix_head = fix;
- /* Note that n is never zero here (which would give no output) */
- for (i = 0; i < 32; i += 2)
- {
- if (n & (3 << i))
- {
- operands[immed_op] = GEN_INT (n & (255 << i));
- output_asm_insn (instr, operands);
- instr = instr2;
- i += 6;
- }
- }
- }
- return "";
+ minipool_fix_tail = fix;
}
-
-/* Return the appropriate ARM instruction for the operation code.
- The returned result should not be overwritten. OP is the rtx of the
- operation. SHIFT_FIRST_ARG is TRUE if the first argument of the operator
- was shifted. */
-
-char *
-arithmetic_instr (op, shift_first_arg)
- rtx op;
- int shift_first_arg;
+/* Scan INSN and note any of its operands that need fixing. */
+static void
+note_invalid_constants (insn, address)
+ rtx insn;
+ HOST_WIDE_INT address;
{
- switch (GET_CODE (op))
- {
- case PLUS:
- return "add";
+ int opno;
- case MINUS:
- return shift_first_arg ? "rsb" : "sub";
+ extract_insn (insn);
- case IOR:
- return "orr";
+ if (! constrain_operands (1))
+ fatal_insn_not_found (insn);
- case XOR:
- return "eor";
+ /* Fill in recog_op_alt with information about the constraints of this
+ insn. */
+ preprocess_constraints ();
- case AND:
- return "and";
+ for (opno = 0; opno < recog_data.n_operands; opno++)
+ {
+ /* Things we need to fix can only occur in inputs. */
+ if (recog_data.operand_type[opno] != OP_IN)
+ continue;
+
+ /* If this alternative is a memory reference, then any mention
+ of constants in this alternative is really to fool reload
+ into allowing us to accept one there. We need to fix them up
+ now so that we output the right code. */
+ if (recog_op_alt[opno][which_alternative].memory_ok)
+ {
+ rtx op = recog_data.operand[opno];
- default:
- abort ();
+ if (CONSTANT_P (op))
+ push_minipool_fix (insn, address, recog_data.operand_loc[opno],
+ recog_data.operand_mode[opno], op);
+#if 0
+ /* RWE: Now we look correctly at the operands for the insn,
+ this shouldn't be needed any more. */
+#ifndef AOF_ASSEMBLER
+ /* XXX Is this still needed? */
+ else if (GET_CODE (op) == UNSPEC && XINT (op, 1) == 3)
+ push_minipool_fix (insn, address, recog_data.operand_loc[opno],
+ recog_data.operand_mode[opno],
+ XVECEXP (op, 0, 0));
+#endif
+#endif
+ else if (GET_CODE (op) == MEM
+ && GET_CODE (XEXP (op, 0)) == SYMBOL_REF
+ && CONSTANT_POOL_ADDRESS_P (XEXP (op, 0)))
+ push_minipool_fix (insn, address, recog_data.operand_loc[opno],
+ recog_data.operand_mode[opno],
+ get_pool_constant (XEXP (op, 0)));
+ }
}
}
-
-/* Ensure valid constant shifts and return the appropriate shift mnemonic
- for the operation code. The returned result should not be overwritten.
- OP is the rtx code of the shift.
- On exit, *AMOUNTP will be -1 if the shift is by a register, or a constant
- shift. */
-
-static char *
-shift_op (op, amountp)
- rtx op;
- HOST_WIDE_INT *amountp;
+void
+arm_reorg (first)
+ rtx first;
{
- char *mnem;
- enum rtx_code code = GET_CODE (op);
+ rtx insn;
+ HOST_WIDE_INT address = 0;
+ Mfix * fix;
- if (GET_CODE (XEXP (op, 1)) == REG || GET_CODE (XEXP (op, 1)) == SUBREG)
- *amountp = -1;
- else if (GET_CODE (XEXP (op, 1)) == CONST_INT)
- *amountp = INTVAL (XEXP (op, 1));
- else
+ minipool_fix_head = minipool_fix_tail = NULL;
+
+ /* The first insn must always be a note, or the code below won't
+ scan it properly. */
+ if (GET_CODE (first) != NOTE)
abort ();
- switch (code)
+ /* Scan all the insns and record the operands that will need fixing. */
+ for (insn = next_nonnote_insn (first); insn; insn = next_nonnote_insn (insn))
{
- case ASHIFT:
- mnem = "asl";
- break;
-
- case ASHIFTRT:
- mnem = "asr";
- break;
-
- case LSHIFTRT:
- mnem = "lsr";
- break;
- case ROTATERT:
- mnem = "ror";
- break;
+ if (GET_CODE (insn) == BARRIER)
+ push_minipool_barrier (insn, address);
+ else if (GET_CODE (insn) == INSN || GET_CODE (insn) == CALL_INSN
+ || GET_CODE (insn) == JUMP_INSN)
+ {
+ rtx table;
- case MULT:
- /* We never have to worry about the amount being other than a
- power of 2, since this case can never be reloaded from a reg. */
- if (*amountp != -1)
- *amountp = int_log2 (*amountp);
- else
- abort ();
- return "asl";
+ note_invalid_constants (insn, address);
+ address += get_attr_length (insn);
- default:
- abort ();
+ /* If the insn is a vector jump, add the size of the table
+ and skip the table. */
+ if ((table = is_jump_table (insn)) != NULL)
+ {
+ address += get_jump_table_size (table);
+ insn = table;
+ }
+ }
}
- if (*amountp != -1)
+ fix = minipool_fix_head;
+
+ /* Now scan the fixups and perform the required changes. */
+ while (fix)
{
- /* This is not 100% correct, but follows from the desire to merge
- multiplication by a power of 2 with the recognizer for a
- shift. >=32 is not a valid shift for "asl", so we must try and
- output a shift that produces the correct arithmetical result.
- Using lsr #32 is identical except for the fact that the carry bit
- is not set correctly if we set the flags; but we never use the
- carry bit from such an operation, so we can ignore that. */
- if (code == ROTATERT)
- *amountp &= 31; /* Rotate is just modulo 32 */
- else if (*amountp != (*amountp & 31))
- {
- if (code == ASHIFT)
- mnem = "lsr";
- *amountp = 32;
- }
-
- /* Shifts of 0 are no-ops. */
- if (*amountp == 0)
- return NULL;
- }
+ Mfix * ftmp;
+ Mfix * fdel;
+ Mfix * last_added_fix;
+ Mfix * last_barrier = NULL;
+ Mfix * this_fix;
+
+ /* Skip any further barriers before the next fix. */
+ while (fix && GET_CODE (fix->insn) == BARRIER)
+ fix = fix->next;
+
+ /* No more fixes. */
+ if (fix == NULL)
+ break;
- return mnem;
-}
+ last_added_fix = NULL;
+ for (ftmp = fix; ftmp; ftmp = ftmp->next)
+ {
+ if (GET_CODE (ftmp->insn) == BARRIER)
+ {
+ if (ftmp->address >= minipool_vector_head->max_address)
+ break;
-/* Obtain the shift from the POWER of two. */
+ last_barrier = ftmp;
+ }
+ else if ((ftmp->minipool = add_minipool_forward_ref (ftmp)) == NULL)
+ break;
-HOST_WIDE_INT
-int_log2 (power)
- HOST_WIDE_INT power;
-{
- HOST_WIDE_INT shift = 0;
+ last_added_fix = ftmp; /* Keep track of the last fix added. */
+ }
- while (((((HOST_WIDE_INT) 1) << shift) & power) == 0)
- {
- if (shift > 31)
- abort ();
- shift++;
- }
+ /* If we found a barrier, drop back to that; any fixes that we
+ could have reached but come after the barrier will now go in
+ the next mini-pool. */
+ if (last_barrier != NULL)
+ {
+ /* Reduce the refcount for those fixes that won't go into this
+ pool after all. */
+ for (fdel = last_barrier->next;
+ fdel && fdel != ftmp;
+ fdel = fdel->next)
+ {
+ fdel->minipool->refcount--;
+ fdel->minipool = NULL;
+ }
- return shift;
-}
+ ftmp = last_barrier;
+ }
+ else
+ {
+ /* ftmp is first fix that we can't fit into this pool and
+ there no natural barriers that we could use. Insert a
+ new barrier in the code somewhere between the previous
+ fix and this one, and arrange to jump around it. */
+ HOST_WIDE_INT max_address;
+
+ /* The last item on the list of fixes must be a barrier, so
+ we can never run off the end of the list of fixes without
+ last_barrier being set. */
+ if (ftmp == NULL)
+ abort ();
-/* Output a .ascii pseudo-op, keeping track of lengths. This is because
- /bin/as is horribly restrictive. */
+ max_address = minipool_vector_head->max_address;
+ /* Check that there isn't another fix that is in range that
+ we couldn't fit into this pool because the pool was
+ already too large: we need to put the pool before such an
+ instruction. */
+ if (ftmp->address < max_address)
+ max_address = ftmp->address;
-void
-output_ascii_pseudo_op (stream, p, len)
- FILE *stream;
- unsigned char *p;
- int len;
-{
- int i;
- int len_so_far = 1000;
- int chars_so_far = 0;
+ last_barrier = create_fix_barrier (last_added_fix, max_address);
+ }
- for (i = 0; i < len; i++)
- {
- register int c = p[i];
+ assign_minipool_offsets (last_barrier);
- if (len_so_far > 50)
+ while (ftmp)
{
- if (chars_so_far)
- fputs ("\"\n", stream);
- fputs ("\t.ascii\t\"", stream);
- len_so_far = 0;
- chars_so_far = 0;
- }
+ if (GET_CODE (ftmp->insn) != BARRIER
+ && ((ftmp->minipool = add_minipool_backward_ref (ftmp))
+ == NULL))
+ break;
- if (c == '\"' || c == '\\')
- {
- putc('\\', stream);
- len_so_far++;
+ ftmp = ftmp->next;
}
- if (c >= ' ' && c < 0177)
- {
- putc (c, stream);
- len_so_far++;
- }
- else
- {
- fprintf (stream, "\\%03o", c);
- len_so_far +=4;
- }
+ /* Scan over the fixes we have identified for this pool, fixing them
+ up and adding the constants to the pool itself. */
+ for (this_fix = fix; this_fix && ftmp != this_fix;
+ this_fix = this_fix->next)
+ if (GET_CODE (this_fix->insn) != BARRIER)
+ {
+ rtx addr
+ = plus_constant (gen_rtx_LABEL_REF (VOIDmode,
+ minipool_vector_label),
+ this_fix->minipool->offset);
+ *this_fix->loc = gen_rtx_MEM (this_fix->mode, addr);
+ }
- chars_so_far++;
+ dump_minipool (last_barrier->insn);
+ fix = ftmp;
}
- fputs ("\"\n", stream);
+ /* From now on we must synthesize any constants that we can't handle
+ directly. This can happen if the RTL gets split during final
+ instruction generation. */
+ after_arm_reorg = 1;
}
\f
+/* Routines to output assembly language. */
-/* Try to determine whether a pattern really clobbers the link register.
- This information is useful when peepholing, so that lr need not be pushed
- if we combine a call followed by a return.
- NOTE: This code does not check for side-effect expressions in a SET_SRC:
- such a check should not be needed because these only update an existing
- value within a register; the register must still be set elsewhere within
- the function. */
-
-static int
-pattern_really_clobbers_lr (x)
+/* If the rtx is the correct value then return the string of the number.
+ In this way we can ensure that valid double constants are generated even
+ when cross compiling. */
+char *
+fp_immediate_constant (x)
rtx x;
{
+ REAL_VALUE_TYPE r;
int i;
- switch (GET_CODE (x))
- {
- case SET:
- switch (GET_CODE (SET_DEST (x)))
- {
- case REG:
- return REGNO (SET_DEST (x)) == 14;
+ if (!fpa_consts_inited)
+ init_fpa_table ();
+
+ REAL_VALUE_FROM_CONST_DOUBLE (r, x);
+ for (i = 0; i < 8; i++)
+ if (REAL_VALUES_EQUAL (r, values_fpa[i]))
+ return strings_fpa[i];
- case SUBREG:
- if (GET_CODE (XEXP (SET_DEST (x), 0)) == REG)
- return REGNO (XEXP (SET_DEST (x), 0)) == 14;
+ abort ();
+}
- if (GET_CODE (XEXP (SET_DEST (x), 0)) == MEM)
- return 0;
- abort ();
+/* As for fp_immediate_constant, but value is passed directly, not in rtx. */
+static char *
+fp_const_from_val (r)
+ REAL_VALUE_TYPE * r;
+{
+ int i;
- default:
- return 0;
- }
+ if (! fpa_consts_inited)
+ init_fpa_table ();
- case PARALLEL:
- for (i = 0; i < XVECLEN (x, 0); i++)
- if (pattern_really_clobbers_lr (XVECEXP (x, 0, i)))
- return 1;
- return 0;
+ for (i = 0; i < 8; i++)
+ if (REAL_VALUES_EQUAL (*r, values_fpa[i]))
+ return strings_fpa[i];
- case CLOBBER:
- switch (GET_CODE (XEXP (x, 0)))
- {
- case REG:
- return REGNO (XEXP (x, 0)) == 14;
+ abort ();
+}
- case SUBREG:
- if (GET_CODE (XEXP (XEXP (x, 0), 0)) == REG)
- return REGNO (XEXP (XEXP (x, 0), 0)) == 14;
- abort ();
+/* Output the operands of a LDM/STM instruction to STREAM.
+ MASK is the ARM register set mask of which only bits 0-15 are important.
+ INSTR is the possibly suffixed base register. HAT unequals zero if a hat
+ must follow the register list. */
- default:
- return 0;
- }
+static void
+print_multi_reg (stream, instr, reg, mask, hat)
+ FILE * stream;
+ char * instr;
+ int reg;
+ int mask;
+ int hat;
+{
+ int i;
+ int not_first = FALSE;
- case UNSPEC:
- return 1;
+ fputc ('\t', stream);
+ asm_fprintf (stream, instr, reg);
+ fputs (", {", stream);
+
+ for (i = 0; i <= LAST_ARM_REGNUM; i++)
+ if (mask & (1 << i))
+ {
+ if (not_first)
+ fprintf (stream, ", ");
+
+ asm_fprintf (stream, "%r", i);
+ not_first = TRUE;
+ }
- default:
- return 0;
+ fprintf (stream, "}%s\n", hat ? "^" : "");
+}
+
+/* Output a 'call' insn. */
+
+char *
+output_call (operands)
+ rtx * operands;
+{
+ /* Handle calls to lr using ip (which may be clobbered in subr anyway). */
+
+ if (REGNO (operands[0]) == LR_REGNUM)
+ {
+ operands[0] = gen_rtx_REG (SImode, IP_REGNUM);
+ output_asm_insn ("mov%?\t%0, %|lr", operands);
}
+
+ output_asm_insn ("mov%?\t%|lr, %|pc", operands);
+
+ if (TARGET_INTERWORK)
+ output_asm_insn ("bx%?\t%0", operands);
+ else
+ output_asm_insn ("mov%?\t%|pc, %0", operands);
+
+ return "";
}
static int
-function_really_clobbers_lr (first)
- rtx first;
+eliminate_lr2ip (x)
+ rtx * x;
{
- rtx insn, next;
+ int something_changed = 0;
+ rtx x0 = * x;
+ int code = GET_CODE (x0);
+ register int i, j;
+ register const char * fmt;
- for (insn = first; insn; insn = next_nonnote_insn (insn))
+ switch (code)
{
- switch (GET_CODE (insn))
+ case REG:
+ if (REGNO (x0) == LR_REGNUM)
{
- case BARRIER:
- case NOTE:
- case CODE_LABEL:
- case JUMP_INSN: /* Jump insns only change the PC (and conds) */
- case INLINE_HEADER:
- break;
-
- case INSN:
- if (pattern_really_clobbers_lr (PATTERN (insn)))
- return 1;
- break;
-
- case CALL_INSN:
- /* Don't yet know how to handle those calls that are not to a
- SYMBOL_REF */
- if (GET_CODE (PATTERN (insn)) != PARALLEL)
- abort ();
-
- switch (GET_CODE (XVECEXP (PATTERN (insn), 0, 0)))
- {
- case CALL:
- if (GET_CODE (XEXP (XEXP (XVECEXP (PATTERN (insn), 0, 0), 0), 0))
- != SYMBOL_REF)
- return 1;
- break;
+ *x = gen_rtx_REG (SImode, IP_REGNUM);
+ return 1;
+ }
+ return 0;
+ default:
+ /* Scan through the sub-elements and change any references there. */
+ fmt = GET_RTX_FORMAT (code);
+
+ for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
+ if (fmt[i] == 'e')
+ something_changed |= eliminate_lr2ip (&XEXP (x0, i));
+ else if (fmt[i] == 'E')
+ for (j = 0; j < XVECLEN (x0, i); j++)
+ something_changed |= eliminate_lr2ip (&XVECEXP (x0, i, j));
+
+ return something_changed;
+ }
+}
+
+/* Output a 'call' insn that is a reference in memory. */
- case SET:
- if (GET_CODE (XEXP (XEXP (SET_SRC (XVECEXP (PATTERN (insn),
- 0, 0)), 0), 0))
- != SYMBOL_REF)
- return 1;
- break;
+char *
+output_call_mem (operands)
+ rtx * operands;
+{
+ operands[0] = copy_rtx (operands[0]); /* Be ultra careful. */
+ /* Handle calls using lr by using ip (which may be clobbered in subr anyway). */
+ if (eliminate_lr2ip (&operands[0]))
+ output_asm_insn ("mov%?\t%|ip, %|lr", operands);
- default: /* Don't recognize it, be safe */
- return 1;
- }
+ if (TARGET_INTERWORK)
+ {
+ output_asm_insn ("ldr%?\t%|ip, %0", operands);
+ output_asm_insn ("mov%?\t%|lr, %|pc", operands);
+ output_asm_insn ("bx%?\t%|ip", operands);
+ }
+ else
+ {
+ output_asm_insn ("mov%?\t%|lr, %|pc", operands);
+ output_asm_insn ("ldr%?\t%|pc, %0", operands);
+ }
- /* A call can be made (by peepholing) not to clobber lr iff it is
- followed by a return. There may, however, be a use insn iff
- we are returning the result of the call.
- If we run off the end of the insn chain, then that means the
- call was at the end of the function. Unfortunately we don't
- have a return insn for the peephole to recognize, so we
- must reject this. (Can this be fixed by adding our own insn?) */
- if ((next = next_nonnote_insn (insn)) == NULL)
- return 1;
+ return "";
+}
- /* No need to worry about lr if the call never returns */
- if (GET_CODE (next) == BARRIER)
- break;
- if (GET_CODE (next) == INSN && GET_CODE (PATTERN (next)) == USE
- && (GET_CODE (XVECEXP (PATTERN (insn), 0, 0)) == SET)
- && (REGNO (SET_DEST (XVECEXP (PATTERN (insn), 0, 0)))
- == REGNO (XEXP (PATTERN (next), 0))))
- if ((next = next_nonnote_insn (next)) == NULL)
- return 1;
+/* Output a move from arm registers to an fpu registers.
+ OPERANDS[0] is an fpu register.
+ OPERANDS[1] is the first registers of an arm register pair. */
- if (GET_CODE (next) == JUMP_INSN
- && GET_CODE (PATTERN (next)) == RETURN)
- break;
- return 1;
+char *
+output_mov_long_double_fpu_from_arm (operands)
+ rtx * operands;
+{
+ int arm_reg0 = REGNO (operands[1]);
+ rtx ops[3];
- default:
- abort ();
- }
- }
+ if (arm_reg0 == IP_REGNUM)
+ abort ();
- /* We have reached the end of the chain so lr was _not_ clobbered */
- return 0;
+ ops[0] = gen_rtx_REG (SImode, arm_reg0);
+ ops[1] = gen_rtx_REG (SImode, 1 + arm_reg0);
+ ops[2] = gen_rtx_REG (SImode, 2 + arm_reg0);
+
+ output_asm_insn ("stm%?fd\t%|sp!, {%0, %1, %2}", ops);
+ output_asm_insn ("ldf%?e\t%0, [%|sp], #12", operands);
+
+ return "";
}
+/* Output a move from an fpu register to arm registers.
+ OPERANDS[0] is the first registers of an arm register pair.
+ OPERANDS[1] is an fpu register. */
+
char *
-output_return_instruction (operand, really_return, reverse)
- rtx operand;
- int really_return;
- int reverse;
+output_mov_long_double_arm_from_fpu (operands)
+ rtx * operands;
{
- char instr[100];
- int reg, live_regs = 0;
- int volatile_func = (optimize > 0
- && TREE_THIS_VOLATILE (current_function_decl));
+ int arm_reg0 = REGNO (operands[0]);
+ rtx ops[3];
- return_used_this_function = 1;
+ if (arm_reg0 == IP_REGNUM)
+ abort ();
- if (volatile_func)
- {
- rtx ops[2];
- /* If this function was declared non-returning, and we have found a tail
- call, then we have to trust that the called function won't return. */
- if (! really_return)
- return "";
-
- /* Otherwise, trap an attempted return by aborting. */
- ops[0] = operand;
- ops[1] = gen_rtx (SYMBOL_REF, Pmode, "abort");
- assemble_external_libcall (ops[1]);
- output_asm_insn (reverse ? "bl%D0\t%a1" : "bl%d0\t%a1", ops);
- return "";
- }
-
- if (current_function_calls_alloca && ! really_return)
- abort();
-
- for (reg = 0; reg <= 10; reg++)
- if (regs_ever_live[reg] && ! call_used_regs[reg])
- live_regs++;
+ ops[0] = gen_rtx_REG (SImode, arm_reg0);
+ ops[1] = gen_rtx_REG (SImode, 1 + arm_reg0);
+ ops[2] = gen_rtx_REG (SImode, 2 + arm_reg0);
- if (live_regs || (regs_ever_live[14] && ! lr_save_eliminated))
- live_regs++;
+ output_asm_insn ("stf%?e\t%1, [%|sp, #-12]!", operands);
+ output_asm_insn ("ldm%?fd\t%|sp!, {%0, %1, %2}", ops);
+ return "";
+}
- if (frame_pointer_needed)
- live_regs += 4;
+/* Output a move from arm registers to arm registers of a long double
+ OPERANDS[0] is the destination.
+ OPERANDS[1] is the source. */
+char *
+output_mov_long_double_arm_from_arm (operands)
+ rtx * operands;
+{
+ /* We have to be careful here because the two might overlap. */
+ int dest_start = REGNO (operands[0]);
+ int src_start = REGNO (operands[1]);
+ rtx ops[2];
+ int i;
- if (live_regs)
+ if (dest_start < src_start)
{
- if (lr_save_eliminated || ! regs_ever_live[14])
- live_regs++;
-
- if (frame_pointer_needed)
- strcpy (instr,
- reverse ? "ldm%?%D0ea\t%|fp, {" : "ldm%?%d0ea\t%|fp, {");
- else
- strcpy (instr,
- reverse ? "ldm%?%D0fd\t%|sp!, {" : "ldm%?%d0fd\t%|sp!, {");
-
- for (reg = 0; reg <= 10; reg++)
- if (regs_ever_live[reg] && ! call_used_regs[reg])
- {
- strcat (instr, "%|");
- strcat (instr, reg_names[reg]);
- if (--live_regs)
- strcat (instr, ", ");
- }
-
- if (frame_pointer_needed)
- {
- strcat (instr, "%|");
- strcat (instr, reg_names[11]);
- strcat (instr, ", ");
- strcat (instr, "%|");
- strcat (instr, reg_names[13]);
- strcat (instr, ", ");
- strcat (instr, "%|");
- strcat (instr, really_return ? reg_names[15] : reg_names[14]);
- }
- else
+ for (i = 0; i < 3; i++)
{
- strcat (instr, "%|");
- strcat (instr, really_return ? reg_names[15] : reg_names[14]);
+ ops[0] = gen_rtx_REG (SImode, dest_start + i);
+ ops[1] = gen_rtx_REG (SImode, src_start + i);
+ output_asm_insn ("mov%?\t%0, %1", ops);
}
- strcat (instr, (TARGET_APCS_32 || !really_return) ? "}" : "}^");
- output_asm_insn (instr, &operand);
}
- else if (really_return)
+ else
{
- sprintf (instr, "mov%%?%%%s0%s\t%%|pc, %%|lr",
- reverse ? "D" : "d", TARGET_APCS_32 ? "" : "s");
- output_asm_insn (instr, &operand);
+ for (i = 2; i >= 0; i--)
+ {
+ ops[0] = gen_rtx_REG (SImode, dest_start + i);
+ ops[1] = gen_rtx_REG (SImode, src_start + i);
+ output_asm_insn ("mov%?\t%0, %1", ops);
+ }
}
return "";
}
-/* Return nonzero if optimizing and the current function is volatile.
- Such functions never return, and many memory cycles can be saved
- by not storing register values that will never be needed again.
- This optimization was added to speed up context switching in a
- kernel application. */
-int
-arm_volatile_func ()
-{
- return (optimize > 0 && TREE_THIS_VOLATILE (current_function_decl));
-}
+/* Output a move from arm registers to an fpu registers.
+ OPERANDS[0] is an fpu register.
+ OPERANDS[1] is the first registers of an arm register pair. */
-/* The amount of stack adjustment that happens here, in output_return and in
- output_epilogue must be exactly the same as was calculated during reload,
- or things will point to the wrong place. The only time we can safely
- ignore this constraint is when a function has no arguments on the stack,
- no stack frame requirement and no live registers execpt for `lr'. If we
- can guarantee that by making all function calls into tail calls and that
- lr is not clobbered in any other way, then there is no need to push lr
- onto the stack. */
-
-void
-output_func_prologue (f, frame_size)
- FILE *f;
- int frame_size;
+char *
+output_mov_double_fpu_from_arm (operands)
+ rtx * operands;
{
- int reg, live_regs_mask = 0;
- rtx operands[3];
- int volatile_func = (optimize > 0
- && TREE_THIS_VOLATILE (current_function_decl));
-
- /* Nonzero if we must stuff some register arguments onto the stack as if
- they were passed there. */
- int store_arg_regs = 0;
-
- if (arm_ccfsm_state || arm_target_insn)
- abort (); /* Sanity check */
-
- if (arm_naked_function_p (current_function_decl))
- return;
+ int arm_reg0 = REGNO (operands[1]);
+ rtx ops[2];
- return_used_this_function = 0;
- lr_save_eliminated = 0;
+ if (arm_reg0 == IP_REGNUM)
+ abort ();
- fprintf (f, "\t%s args = %d, pretend = %d, frame = %d\n",
- ASM_COMMENT_START, current_function_args_size,
- current_function_pretend_args_size, frame_size);
- fprintf (f, "\t%s frame_needed = %d, current_function_anonymous_args = %d\n",
- ASM_COMMENT_START, frame_pointer_needed,
- current_function_anonymous_args);
-
- if (volatile_func)
- fprintf (f, "\t%s Volatile function.\n", ASM_COMMENT_START);
-
- if (current_function_anonymous_args && current_function_pretend_args_size)
- store_arg_regs = 1;
-
- for (reg = 0; reg <= 10; reg++)
- if (regs_ever_live[reg] && ! call_used_regs[reg])
- live_regs_mask |= (1 << reg);
-
- if (frame_pointer_needed)
- live_regs_mask |= 0xD800;
- else if (regs_ever_live[14])
- {
- if (! current_function_args_size
- && ! function_really_clobbers_lr (get_insns ()))
- lr_save_eliminated = 1;
- else
- live_regs_mask |= 0x4000;
- }
-
- if (live_regs_mask)
- {
- /* if a di mode load/store multiple is used, and the base register
- is r3, then r4 can become an ever live register without lr
- doing so, in this case we need to push lr as well, or we
- will fail to get a proper return. */
-
- live_regs_mask |= 0x4000;
- lr_save_eliminated = 0;
-
- }
-
- if (lr_save_eliminated)
- fprintf (f,"\t%s I don't think this function clobbers lr\n",
- ASM_COMMENT_START);
-
-#ifdef AOF_ASSEMBLER
- if (flag_pic)
- fprintf (f, "\tmov\t%sip, %s%s\n", REGISTER_PREFIX, REGISTER_PREFIX,
- reg_names[PIC_OFFSET_TABLE_REGNUM]);
-#endif
+ ops[0] = gen_rtx_REG (SImode, arm_reg0);
+ ops[1] = gen_rtx_REG (SImode, 1 + arm_reg0);
+ output_asm_insn ("stm%?fd\t%|sp!, {%0, %1}", ops);
+ output_asm_insn ("ldf%?d\t%0, [%|sp], #8", operands);
+ return "";
}
+/* Output a move from an fpu register to arm registers.
+ OPERANDS[0] is the first registers of an arm register pair.
+ OPERANDS[1] is an fpu register. */
-void
-output_func_epilogue (f, frame_size)
- FILE *f;
- int frame_size;
+char *
+output_mov_double_arm_from_fpu (operands)
+ rtx * operands;
{
- int reg, live_regs_mask = 0, code_size = 0;
- /* If we need this then it will always be at lesat this much */
- int floats_offset = 24;
- rtx operands[3];
- int volatile_func = (optimize > 0
- && TREE_THIS_VOLATILE (current_function_decl));
+ int arm_reg0 = REGNO (operands[0]);
+ rtx ops[2];
- if (use_return_insn() && return_used_this_function)
- {
- if (frame_size && !(frame_pointer_needed || TARGET_APCS))
- {
- abort ();
- }
- goto epilogue_done;
- }
+ if (arm_reg0 == IP_REGNUM)
+ abort ();
- /* Naked functions don't have epilogues. */
- if (arm_naked_function_p (current_function_decl))
- goto epilogue_done;
+ ops[0] = gen_rtx_REG (SImode, arm_reg0);
+ ops[1] = gen_rtx_REG (SImode, 1 + arm_reg0);
+ output_asm_insn ("stf%?d\t%1, [%|sp, #-8]!", operands);
+ output_asm_insn ("ldm%?fd\t%|sp!, {%0, %1}", ops);
+ return "";
+}
- /* A volatile function should never return. Call abort. */
- if (volatile_func)
- {
- rtx op = gen_rtx (SYMBOL_REF, Pmode, "abort");
- assemble_external_libcall (op);
- output_asm_insn ("bl\t%a0", &op);
- code_size = 4;
- goto epilogue_done;
- }
+/* Output a move between double words.
+ It must be REG<-REG, REG<-CONST_DOUBLE, REG<-CONST_INT, REG<-MEM
+ or MEM<-REG and all MEMs must be offsettable addresses. */
- for (reg = 0; reg <= 10; reg++)
- if (regs_ever_live[reg] && ! call_used_regs[reg])
- {
- live_regs_mask |= (1 << reg);
- floats_offset += 4;
- }
+char *
+output_move_double (operands)
+ rtx * operands;
+{
+ enum rtx_code code0 = GET_CODE (operands[0]);
+ enum rtx_code code1 = GET_CODE (operands[1]);
+ rtx otherops[3];
- if (frame_pointer_needed)
+ if (code0 == REG)
{
- for (reg = 23; reg > 15; reg--)
- if (regs_ever_live[reg] && ! call_used_regs[reg])
- {
- fprintf (f, "\tldfe\t%s%s, [%sfp, #-%d]\n", REGISTER_PREFIX,
- reg_names[reg], REGISTER_PREFIX, floats_offset);
- floats_offset += 12;
- code_size += 4;
- }
+ int reg0 = REGNO (operands[0]);
- live_regs_mask |= 0xA800;
- print_multi_reg (f, "ldmea\t%sfp", live_regs_mask,
- TARGET_APCS_32 ? FALSE : TRUE);
- code_size += 4;
- }
- else
- {
- /* Restore stack pointer if necessary. */
- if (frame_size)
+ otherops[0] = gen_rtx_REG (SImode, 1 + reg0);
+
+ if (code1 == REG)
{
- operands[0] = operands[1] = stack_pointer_rtx;
- operands[2] = gen_rtx (CONST_INT, VOIDmode, frame_size);
- output_add_immediate (operands);
- }
+ int reg1 = REGNO (operands[1]);
+ if (reg1 == IP_REGNUM)
+ abort ();
- for (reg = 16; reg < 24; reg++)
- if (regs_ever_live[reg] && ! call_used_regs[reg])
- {
- fprintf (f, "\tldfe\t%s%s, [%ssp], #12\n", REGISTER_PREFIX,
- reg_names[reg], REGISTER_PREFIX);
- code_size += 4;
- }
- if (current_function_pretend_args_size == 0 && regs_ever_live[14])
- {
- if (lr_save_eliminated)
- fprintf (f, (TARGET_APCS_32 ? "\tmov\t%spc, %slr\n"
- : "\tmovs\t%spc, %slr\n"),
- REGISTER_PREFIX, REGISTER_PREFIX, f);
+ /* Ensure the second source is not overwritten. */
+ if (reg1 == reg0 + (WORDS_BIG_ENDIAN ? -1 : 1))
+ output_asm_insn ("mov%?\t%Q0, %Q1\n\tmov%?\t%R0, %R1", operands);
else
- print_multi_reg (f, "ldmfd\t%ssp!", live_regs_mask | 0x8000,
- TARGET_APCS_32 ? FALSE : TRUE);
- code_size += 4;
+ output_asm_insn ("mov%?\t%R0, %R1\n\tmov%?\t%Q0, %Q1", operands);
}
- else
+ else if (code1 == CONST_DOUBLE)
{
- if (live_regs_mask || regs_ever_live[14])
+ if (GET_MODE (operands[1]) == DFmode)
{
- /* Restore the integer regs, and the return address into lr */
- if (! lr_save_eliminated)
- live_regs_mask |= 0x4000;
+ long l[2];
+ union real_extract u;
- if (live_regs_mask != 0)
- {
- print_multi_reg (f, "ldmfd\t%ssp!", live_regs_mask, FALSE);
- code_size += 4;
- }
+ bcopy ((char *) &CONST_DOUBLE_LOW (operands[1]), (char *) &u,
+ sizeof (u));
+ REAL_VALUE_TO_TARGET_DOUBLE (u.d, l);
+ otherops[1] = GEN_INT (l[1]);
+ operands[1] = GEN_INT (l[0]);
}
- if (current_function_pretend_args_size)
+ else if (GET_MODE (operands[1]) != VOIDmode)
+ abort ();
+ else if (WORDS_BIG_ENDIAN)
{
- /* Unwind the pre-pushed regs */
- operands[0] = operands[1] = stack_pointer_rtx;
- operands[2] = gen_rtx (CONST_INT, VOIDmode,
- current_function_pretend_args_size);
- output_add_immediate (operands);
+
+ otherops[1] = GEN_INT (CONST_DOUBLE_LOW (operands[1]));
+ operands[1] = GEN_INT (CONST_DOUBLE_HIGH (operands[1]));
+ }
+ else
+ {
+
+ otherops[1] = GEN_INT (CONST_DOUBLE_HIGH (operands[1]));
+ operands[1] = GEN_INT (CONST_DOUBLE_LOW (operands[1]));
}
- /* And finally, go home */
- fprintf (f, (TARGET_APCS_32 ? "\tmov\t%spc, %slr\n"
- : "\tmovs\t%spc, %slr\n"),
- REGISTER_PREFIX, REGISTER_PREFIX, f);
- code_size += 4;
+
+ output_mov_immediate (operands);
+ output_mov_immediate (otherops);
}
- }
-
-epilogue_done:
-
- current_function_anonymous_args = 0;
-}
-
-static void
-emit_multi_reg_push (mask)
- int mask;
-{
- int num_regs = 0;
- int i, j;
- rtx par;
-
- for (i = 0; i < 16; i++)
- if (mask & (1 << i))
- num_regs++;
-
- if (num_regs == 0 || num_regs > 16)
- abort ();
-
- par = gen_rtx (PARALLEL, VOIDmode, rtvec_alloc (num_regs));
-
- for (i = 0; i < 16; i++)
- {
- if (mask & (1 << i))
+ else if (code1 == CONST_INT)
{
- XVECEXP (par, 0, 0)
- = gen_rtx (SET, VOIDmode, gen_rtx (MEM, BLKmode,
- gen_rtx (PRE_DEC, BLKmode,
- stack_pointer_rtx)),
- gen_rtx (UNSPEC, BLKmode,
- gen_rtvec (1, gen_rtx (REG, SImode, i)),
- 2));
- break;
+#if HOST_BITS_PER_WIDE_INT > 32
+ /* If HOST_WIDE_INT is more than 32 bits, the intval tells us
+ what the upper word is. */
+ if (WORDS_BIG_ENDIAN)
+ {
+ otherops[1] = GEN_INT (ARM_SIGN_EXTEND (INTVAL (operands[1])));
+ operands[1] = GEN_INT (INTVAL (operands[1]) >> 32);
+ }
+ else
+ {
+ otherops[1] = GEN_INT (INTVAL (operands[1]) >> 32);
+ operands[1] = GEN_INT (ARM_SIGN_EXTEND (INTVAL (operands[1])));
+ }
+#else
+ /* Sign extend the intval into the high-order word. */
+ if (WORDS_BIG_ENDIAN)
+ {
+ otherops[1] = operands[1];
+ operands[1] = (INTVAL (operands[1]) < 0
+ ? constm1_rtx : const0_rtx);
+ }
+ else
+ otherops[1] = INTVAL (operands[1]) < 0 ? constm1_rtx : const0_rtx;
+#endif
+ output_mov_immediate (otherops);
+ output_mov_immediate (operands);
}
- }
-
- for (j = 1, i++; j < num_regs; i++)
- {
- if (mask & (1 << i))
+ else if (code1 == MEM)
{
- XVECEXP (par, 0, j)
- = gen_rtx (USE, VOIDmode, gen_rtx (REG, SImode, i));
- j++;
- }
- }
- emit_insn (par);
-}
-
-void
-arm_expand_prologue ()
-{
- int reg;
- rtx amount = GEN_INT (- get_frame_size ());
- rtx push_insn;
- int num_regs;
- int live_regs_mask = 0;
- int store_arg_regs = 0;
- int volatile_func = (optimize > 0
- && TREE_THIS_VOLATILE (current_function_decl));
+ switch (GET_CODE (XEXP (operands[1], 0)))
+ {
+ case REG:
+ output_asm_insn ("ldm%?ia\t%m1, %M0", operands);
+ break;
- /* Naked functions don't have prologues. */
- if (arm_naked_function_p (current_function_decl))
- return;
+ case PRE_INC:
+ abort (); /* Should never happen now. */
+ break;
- if (current_function_anonymous_args && current_function_pretend_args_size)
- store_arg_regs = 1;
+ case PRE_DEC:
+ output_asm_insn ("ldm%?db\t%m1!, %M0", operands);
+ break;
- if (! volatile_func)
- for (reg = 0; reg <= 10; reg++)
- if (regs_ever_live[reg] && ! call_used_regs[reg])
- live_regs_mask |= 1 << reg;
+ case POST_INC:
+ output_asm_insn ("ldm%?ia\t%m1!, %M0", operands);
+ break;
- if (! volatile_func && regs_ever_live[14])
- live_regs_mask |= 0x4000;
+ case POST_DEC:
+ abort (); /* Should never happen now. */
+ break;
- if (frame_pointer_needed)
- {
- live_regs_mask |= 0xD800;
- emit_insn (gen_movsi (gen_rtx (REG, SImode, 12),
- stack_pointer_rtx));
- }
+ case LABEL_REF:
+ case CONST:
+ output_asm_insn ("adr%?\t%0, %1", operands);
+ output_asm_insn ("ldm%?ia\t%0, %M0", operands);
+ break;
- if (current_function_pretend_args_size)
- {
- if (store_arg_regs)
- emit_multi_reg_push ((0xf0 >> (current_function_pretend_args_size / 4))
- & 0xf);
+ default:
+ if (arm_add_operand (XEXP (XEXP (operands[1], 0), 1),
+ GET_MODE (XEXP (XEXP (operands[1], 0), 1))))
+ {
+ otherops[0] = operands[0];
+ otherops[1] = XEXP (XEXP (operands[1], 0), 0);
+ otherops[2] = XEXP (XEXP (operands[1], 0), 1);
+ if (GET_CODE (XEXP (operands[1], 0)) == PLUS)
+ {
+ if (GET_CODE (otherops[2]) == CONST_INT)
+ {
+ switch (INTVAL (otherops[2]))
+ {
+ case -8:
+ output_asm_insn ("ldm%?db\t%1, %M0", otherops);
+ return "";
+ case -4:
+ output_asm_insn ("ldm%?da\t%1, %M0", otherops);
+ return "";
+ case 4:
+ output_asm_insn ("ldm%?ib\t%1, %M0", otherops);
+ return "";
+ }
+ if (!(const_ok_for_arm (INTVAL (otherops[2]))))
+ output_asm_insn ("sub%?\t%0, %1, #%n2", otherops);
+ else
+ output_asm_insn ("add%?\t%0, %1, %2", otherops);
+ }
+ else
+ output_asm_insn ("add%?\t%0, %1, %2", otherops);
+ }
+ else
+ output_asm_insn ("sub%?\t%0, %1, %2", otherops);
+
+ return "ldm%?ia\t%0, %M0";
+ }
+ else
+ {
+ otherops[1] = adj_offsettable_operand (operands[1], 4);
+ /* Take care of overlapping base/data reg. */
+ if (reg_mentioned_p (operands[0], operands[1]))
+ {
+ output_asm_insn ("ldr%?\t%0, %1", otherops);
+ output_asm_insn ("ldr%?\t%0, %1", operands);
+ }
+ else
+ {
+ output_asm_insn ("ldr%?\t%0, %1", operands);
+ output_asm_insn ("ldr%?\t%0, %1", otherops);
+ }
+ }
+ }
+ }
else
- emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
- GEN_INT (-current_function_pretend_args_size)));
+ abort (); /* Constraints should prevent this. */
}
-
- if (live_regs_mask)
+ else if (code0 == MEM && code1 == REG)
{
- /* If we have to push any regs, then we must push lr as well, or
- we won't get a proper return. */
- live_regs_mask |= 0x4000;
- emit_multi_reg_push (live_regs_mask);
- }
-
- /* For now the integer regs are still pushed in output_func_epilogue (). */
+ if (REGNO (operands[1]) == IP_REGNUM)
+ abort ();
- if (! volatile_func)
- for (reg = 23; reg > 15; reg--)
- if (regs_ever_live[reg] && ! call_used_regs[reg])
- emit_insn (gen_rtx (SET, VOIDmode,
- gen_rtx (MEM, XFmode,
- gen_rtx (PRE_DEC, XFmode,
- stack_pointer_rtx)),
- gen_rtx (REG, XFmode, reg)));
+ switch (GET_CODE (XEXP (operands[0], 0)))
+ {
+ case REG:
+ output_asm_insn ("stm%?ia\t%m0, %M1", operands);
+ break;
- if (frame_pointer_needed)
- emit_insn (gen_addsi3 (hard_frame_pointer_rtx, gen_rtx (REG, SImode, 12),
- (GEN_INT
- (-(4 + current_function_pretend_args_size)))));
+ case PRE_INC:
+ abort (); /* Should never happen now. */
+ break;
- if (amount != const0_rtx)
- {
- emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx, amount));
- emit_insn (gen_rtx (CLOBBER, VOIDmode,
- gen_rtx (MEM, BLKmode, stack_pointer_rtx)));
- }
+ case PRE_DEC:
+ output_asm_insn ("stm%?db\t%m0!, %M1", operands);
+ break;
- /* If we are profiling, make sure no instructions are scheduled before
- the call to mcount. */
- if (profile_flag || profile_block_flag)
- emit_insn (gen_blockage ());
-}
-
-\f
-/* If CODE is 'd', then the X is a condition operand and the instruction
- should only be executed if the condition is true.
- if CODE is 'D', then the X is a condition operand and the instruction
- should only be executed if the condition is false: however, if the mode
- of the comparison is CCFPEmode, then always execute the instruction -- we
- do this because in these circumstances !GE does not necessarily imply LT;
- in these cases the instruction pattern will take care to make sure that
- an instruction containing %d will follow, thereby undoing the effects of
- doing this instruction unconditionally.
- If CODE is 'N' then X is a floating point operand that must be negated
- before output.
- If CODE is 'B' then output a bitwise inverted value of X (a const int).
- If X is a REG and CODE is `M', output a ldm/stm style multi-reg. */
+ case POST_INC:
+ output_asm_insn ("stm%?ia\t%m0!, %M1", operands);
+ break;
-void
-arm_print_operand (stream, x, code)
- FILE *stream;
- rtx x;
- int code;
-{
- switch (code)
- {
- case '@':
- fputs (ASM_COMMENT_START, stream);
- return;
+ case POST_DEC:
+ abort (); /* Should never happen now. */
+ break;
- case '|':
- fputs (REGISTER_PREFIX, stream);
- return;
+ case PLUS:
+ if (GET_CODE (XEXP (XEXP (operands[0], 0), 1)) == CONST_INT)
+ {
+ switch (INTVAL (XEXP (XEXP (operands[0], 0), 1)))
+ {
+ case -8:
+ output_asm_insn ("stm%?db\t%m0, %M1", operands);
+ return "";
- case '?':
- if (arm_ccfsm_state == 3 || arm_ccfsm_state == 4)
- fputs (arm_condition_codes[arm_current_cc], stream);
- return;
+ case -4:
+ output_asm_insn ("stm%?da\t%m0, %M1", operands);
+ return "";
- case 'N':
- {
- REAL_VALUE_TYPE r;
- REAL_VALUE_FROM_CONST_DOUBLE (r, x);
- r = REAL_VALUE_NEGATE (r);
- fprintf (stream, "%s", fp_const_from_val (&r));
- }
- return;
+ case 4:
+ output_asm_insn ("stm%?ib\t%m0, %M1", operands);
+ return "";
+ }
+ }
+ /* Fall through */
- case 'B':
- if (GET_CODE (x) == CONST_INT)
- fprintf (stream,
-#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
- "%d",
-#else
- "%ld",
-#endif
- ARM_SIGN_EXTEND (~ INTVAL (x)));
- else
- {
- putc ('~', stream);
- output_addr_const (stream, x);
+ default:
+ otherops[0] = adj_offsettable_operand (operands[0], 4);
+ otherops[1] = gen_rtx_REG (SImode, 1 + REGNO (operands[1]));
+ output_asm_insn ("str%?\t%1, %0", operands);
+ output_asm_insn ("str%?\t%1, %0", otherops);
}
- return;
-
- case 'i':
- fprintf (stream, "%s", arithmetic_instr (x, 1));
- return;
-
- case 'I':
- fprintf (stream, "%s", arithmetic_instr (x, 0));
- return;
-
- case 'S':
- {
- HOST_WIDE_INT val;
- char *shift = shift_op (x, &val);
-
- if (shift)
- {
- fprintf (stream, ", %s ", shift_op (x, &val));
- if (val == -1)
- arm_print_operand (stream, XEXP (x, 1), 0);
- else
- fprintf (stream,
-#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
- "#%d",
-#else
- "#%ld",
-#endif
- val);
- }
- }
- return;
+ }
+ else
+ abort (); /* Constraints should prevent this */
- case 'Q':
- if (REGNO (x) > 15)
- abort ();
- fputs (REGISTER_PREFIX, stream);
- fputs (reg_names[REGNO (x) + (WORDS_BIG_ENDIAN ? 1 : 0)], stream);
- return;
+ return "";
+}
- case 'R':
- if (REGNO (x) > 15)
- abort ();
- fputs (REGISTER_PREFIX, stream);
- fputs (reg_names[REGNO (x) + (WORDS_BIG_ENDIAN ? 0 : 1)], stream);
- return;
- case 'm':
- fputs (REGISTER_PREFIX, stream);
- if (GET_CODE (XEXP (x, 0)) == REG)
- fputs (reg_names[REGNO (XEXP (x, 0))], stream);
- else
- fputs (reg_names[REGNO (XEXP (XEXP (x, 0), 0))], stream);
- return;
+/* Output an arbitrary MOV reg, #n.
+ OPERANDS[0] is a register. OPERANDS[1] is a const_int. */
- case 'M':
- fprintf (stream, "{%s%s-%s%s}", REGISTER_PREFIX, reg_names[REGNO (x)],
- REGISTER_PREFIX, reg_names[REGNO (x) - 1
- + ((GET_MODE_SIZE (GET_MODE (x))
- + GET_MODE_SIZE (SImode) - 1)
- / GET_MODE_SIZE (SImode))]);
- return;
+char *
+output_mov_immediate (operands)
+ rtx * operands;
+{
+ HOST_WIDE_INT n = INTVAL (operands[1]);
+ int n_ones = 0;
+ int i;
- case 'd':
- if (x)
- fputs (arm_condition_codes[get_arm_condition_code (x)],
- stream);
- return;
+ /* Try to use one MOV */
+ if (const_ok_for_arm (n))
+ {
+ output_asm_insn ("mov%?\t%0, %1", operands);
+ return "";
+ }
- case 'D':
- if (x)
- fputs (arm_condition_codes[ARM_INVERSE_CONDITION_CODE
- (get_arm_condition_code (x))],
- stream);
- return;
+ /* Try to use one MVN */
+ if (const_ok_for_arm (~n))
+ {
+ operands[1] = GEN_INT (~n);
+ output_asm_insn ("mvn%?\t%0, %1", operands);
+ return "";
+ }
- default:
- if (x == 0)
- abort ();
+ /* If all else fails, make it out of ORRs or BICs as appropriate. */
- if (GET_CODE (x) == REG)
- {
- fputs (REGISTER_PREFIX, stream);
- fputs (reg_names[REGNO (x)], stream);
- }
- else if (GET_CODE (x) == MEM)
- {
- output_memory_reference_mode = GET_MODE (x);
- output_address (XEXP (x, 0));
- }
- else if (GET_CODE (x) == CONST_DOUBLE)
- fprintf (stream, "#%s", fp_immediate_constant (x));
- else if (GET_CODE (x) == NEG)
- abort (); /* This should never happen now. */
- else
- {
- fputc ('#', stream);
- output_addr_const (stream, x);
- }
- }
-}
+ for (i=0; i < 32; i++)
+ if (n & 1 << i)
+ n_ones++;
-/* Output a label definition. */
+ if (n_ones > 16) /* Shorter to use MVN with BIC in this case. */
+ output_multi_immediate (operands, "mvn%?\t%0, %1", "bic%?\t%0, %0, %1", 1, ~n);
+ else
+ output_multi_immediate (operands, "mov%?\t%0, %1", "orr%?\t%0, %0, %1", 1, n);
-void
-arm_asm_output_label (stream, name)
- FILE *stream;
- char *name;
-{
- ARM_OUTPUT_LABEL (stream, name);
+ return "";
}
-/* Output code resembling an .lcomm directive. /bin/as doesn't have this
- directive hence this hack, which works by reserving some `.space' in the
- bss segment directly.
- XXX This is a severe hack, which is guaranteed NOT to work since it doesn't
- define STATIC COMMON space but merely STATIC BSS space. */
+/* Output an ADD r, s, #n where n may be too big for one instruction. If
+ adding zero to one register, output nothing. */
-void
-output_lcomm_directive (stream, name, size, align)
- FILE *stream;
- char *name;
- int size, align;
+char *
+output_add_immediate (operands)
+ rtx * operands;
{
- bss_section ();
- ASM_OUTPUT_ALIGN (stream, floor_log2 (align / BITS_PER_UNIT));
- ARM_OUTPUT_LABEL (stream, name);
- fprintf (stream, "\t.space\t%d\n", size);
-}
-\f
-/* A finite state machine takes care of noticing whether or not instructions
- can be conditionally executed, and thus decrease execution time and code
- size by deleting branch instructions. The fsm is controlled by
- final_prescan_insn, and controls the actions of ASM_OUTPUT_OPCODE. */
-
-/* The state of the fsm controlling condition codes are:
- 0: normal, do nothing special
- 1: make ASM_OUTPUT_OPCODE not output this instruction
- 2: make ASM_OUTPUT_OPCODE not output this instruction
- 3: make instructions conditional
- 4: make instructions conditional
-
- State transitions (state->state by whom under condition):
- 0 -> 1 final_prescan_insn if the `target' is a label
- 0 -> 2 final_prescan_insn if the `target' is an unconditional branch
- 1 -> 3 ASM_OUTPUT_OPCODE after not having output the conditional branch
- 2 -> 4 ASM_OUTPUT_OPCODE after not having output the conditional branch
- 3 -> 0 ASM_OUTPUT_INTERNAL_LABEL if the `target' label is reached
- (the target label has CODE_LABEL_NUMBER equal to arm_target_label).
- 4 -> 0 final_prescan_insn if the `target' unconditional branch is reached
- (the target insn is arm_target_insn).
-
- If the jump clobbers the conditions then we use states 2 and 4.
+ HOST_WIDE_INT n = INTVAL (operands[2]);
- A similar thing can be done with conditional return insns.
+ if (n != 0 || REGNO (operands[0]) != REGNO (operands[1]))
+ {
+ if (n < 0)
+ output_multi_immediate (operands,
+ "sub%?\t%0, %1, %2", "sub%?\t%0, %0, %2", 2,
+ -n);
+ else
+ output_multi_immediate (operands,
+ "add%?\t%0, %1, %2", "add%?\t%0, %0, %2", 2,
+ n);
+ }
- XXX In case the `target' is an unconditional branch, this conditionalising
- of the instructions always reduces code size, but not always execution
- time. But then, I want to reduce the code size to somewhere near what
- /bin/cc produces. */
+ return "";
+}
-/* Returns the index of the ARM condition code string in
- `arm_condition_codes'. COMPARISON should be an rtx like
- `(eq (...) (...))'. */
+/* Output a multiple immediate operation.
+ OPERANDS is the vector of operands referred to in the output patterns.
+ INSTR1 is the output pattern to use for the first constant.
+ INSTR2 is the output pattern to use for subsequent constants.
+ IMMED_OP is the index of the constant slot in OPERANDS.
+ N is the constant value. */
-static enum arm_cond_code
-get_arm_condition_code (comparison)
- rtx comparison;
+static char *
+output_multi_immediate (operands, instr1, instr2, immed_op, n)
+ rtx * operands;
+ char * instr1, * instr2;
+ int immed_op;
+ HOST_WIDE_INT n;
{
- enum machine_mode mode = GET_MODE (XEXP (comparison, 0));
- register int code;
- register enum rtx_code comp_code = GET_CODE (comparison);
-
- if (GET_MODE_CLASS (mode) != MODE_CC)
- mode = SELECT_CC_MODE (comp_code, XEXP (comparison, 0),
- XEXP (comparison, 1));
+#if HOST_BITS_PER_WIDE_INT > 32
+ n &= HOST_UINT (0xffffffff);
+#endif
- switch (mode)
+ if (n == 0)
{
- case CC_DNEmode: code = ARM_NE; goto dominance;
- case CC_DEQmode: code = ARM_EQ; goto dominance;
- case CC_DGEmode: code = ARM_GE; goto dominance;
- case CC_DGTmode: code = ARM_GT; goto dominance;
- case CC_DLEmode: code = ARM_LE; goto dominance;
- case CC_DLTmode: code = ARM_LT; goto dominance;
- case CC_DGEUmode: code = ARM_CS; goto dominance;
- case CC_DGTUmode: code = ARM_HI; goto dominance;
- case CC_DLEUmode: code = ARM_LS; goto dominance;
- case CC_DLTUmode: code = ARM_CC;
-
- dominance:
- if (comp_code != EQ && comp_code != NE)
- abort ();
-
- if (comp_code == EQ)
- return ARM_INVERSE_CONDITION_CODE (code);
- return code;
+ operands[immed_op] = const0_rtx;
+ output_asm_insn (instr1, operands); /* Quick and easy output. */
+ }
+ else
+ {
+ int i;
+ char *instr = instr1;
- case CC_NOOVmode:
- switch (comp_code)
+ /* Note that n is never zero here (which would give no output). */
+ for (i = 0; i < 32; i += 2)
{
- case NE: return ARM_NE;
- case EQ: return ARM_EQ;
- case GE: return ARM_PL;
- case LT: return ARM_MI;
- default: abort ();
+ if (n & (3 << i))
+ {
+ operands[immed_op] = GEN_INT (n & (255 << i));
+ output_asm_insn (instr, operands);
+ instr = instr2;
+ i += 6;
+ }
}
+ }
+ return "";
+}
- case CC_Zmode:
- case CCFPmode:
- switch (comp_code)
- {
- case NE: return ARM_NE;
- case EQ: return ARM_EQ;
- default: abort ();
- }
- case CCFPEmode:
- switch (comp_code)
- {
- case GE: return ARM_GE;
- case GT: return ARM_GT;
- case LE: return ARM_LS;
- case LT: return ARM_MI;
- default: abort ();
- }
+/* Return the appropriate ARM instruction for the operation code.
+ The returned result should not be overwritten. OP is the rtx of the
+ operation. SHIFT_FIRST_ARG is TRUE if the first argument of the operator
+ was shifted. */
- case CC_SWPmode:
- switch (comp_code)
- {
- case NE: return ARM_NE;
- case EQ: return ARM_EQ;
- case GE: return ARM_LE;
- case GT: return ARM_LT;
- case LE: return ARM_GE;
- case LT: return ARM_GT;
- case GEU: return ARM_LS;
- case GTU: return ARM_CC;
- case LEU: return ARM_CS;
- case LTU: return ARM_HI;
- default: abort ();
- }
+char *
+arithmetic_instr (op, shift_first_arg)
+ rtx op;
+ int shift_first_arg;
+{
+ switch (GET_CODE (op))
+ {
+ case PLUS:
+ return "add";
- case CC_Cmode:
- switch (comp_code)
- {
- case LTU: return ARM_CS;
- case GEU: return ARM_CC;
- default: abort ();
- }
-
- case CCmode:
- switch (comp_code)
- {
- case NE: return ARM_NE;
- case EQ: return ARM_EQ;
- case GE: return ARM_GE;
- case GT: return ARM_GT;
- case LE: return ARM_LE;
- case LT: return ARM_LT;
- case GEU: return ARM_CS;
- case GTU: return ARM_HI;
- case LEU: return ARM_LS;
- case LTU: return ARM_CC;
- default: abort ();
- }
+ case MINUS:
+ return shift_first_arg ? "rsb" : "sub";
- default: abort ();
- }
+ case IOR:
+ return "orr";
- abort ();
+ case XOR:
+ return "eor";
+
+ case AND:
+ return "and";
+
+ default:
+ abort ();
+ }
}
-void
-final_prescan_insn (insn, opvec, noperands)
- rtx insn;
- rtx *opvec;
- int noperands;
-{
- /* BODY will hold the body of INSN. */
- register rtx body = PATTERN (insn);
+/* Ensure valid constant shifts and return the appropriate shift mnemonic
+ for the operation code. The returned result should not be overwritten.
+ OP is the rtx code of the shift.
+ On exit, *AMOUNTP will be -1 if the shift is by a register, or a constant
+ shift. */
- /* This will be 1 if trying to repeat the trick, and things need to be
- reversed if it appears to fail. */
- int reverse = 0;
+static char *
+shift_op (op, amountp)
+ rtx op;
+ HOST_WIDE_INT *amountp;
+{
+ char * mnem;
+ enum rtx_code code = GET_CODE (op);
- /* JUMP_CLOBBERS will be one implies that the conditions if a branch is
- taken are clobbered, even if the rtl suggests otherwise. It also
- means that we have to grub around within the jump expression to find
- out what the conditions are when the jump isn't taken. */
- int jump_clobbers = 0;
-
- /* If we start with a return insn, we only succeed if we find another one. */
- int seeking_return = 0;
-
- /* START_INSN will hold the insn from where we start looking. This is the
- first insn after the following code_label if REVERSE is true. */
- rtx start_insn = insn;
+ if (GET_CODE (XEXP (op, 1)) == REG || GET_CODE (XEXP (op, 1)) == SUBREG)
+ *amountp = -1;
+ else if (GET_CODE (XEXP (op, 1)) == CONST_INT)
+ *amountp = INTVAL (XEXP (op, 1));
+ else
+ abort ();
- /* If in state 4, check if the target branch is reached, in order to
- change back to state 0. */
- if (arm_ccfsm_state == 4)
+ switch (code)
{
- if (insn == arm_target_insn)
- {
- arm_target_insn = NULL;
- arm_ccfsm_state = 0;
- }
- return;
- }
+ case ASHIFT:
+ mnem = "asl";
+ break;
- /* If in state 3, it is possible to repeat the trick, if this insn is an
- unconditional branch to a label, and immediately following this branch
- is the previous target label which is only used once, and the label this
- branch jumps to is not too far off. */
- if (arm_ccfsm_state == 3)
- {
- if (simplejump_p (insn))
- {
- start_insn = next_nonnote_insn (start_insn);
- if (GET_CODE (start_insn) == BARRIER)
- {
- /* XXX Isn't this always a barrier? */
- start_insn = next_nonnote_insn (start_insn);
- }
- if (GET_CODE (start_insn) == CODE_LABEL
- && CODE_LABEL_NUMBER (start_insn) == arm_target_label
- && LABEL_NUSES (start_insn) == 1)
- reverse = TRUE;
+ case ASHIFTRT:
+ mnem = "asr";
+ break;
+
+ case LSHIFTRT:
+ mnem = "lsr";
+ break;
+
+ case ROTATERT:
+ mnem = "ror";
+ break;
+
+ case MULT:
+ /* We never have to worry about the amount being other than a
+ power of 2, since this case can never be reloaded from a reg. */
+ if (*amountp != -1)
+ *amountp = int_log2 (*amountp);
+ else
+ abort ();
+ return "asl";
+
+ default:
+ abort ();
+ }
+
+ if (*amountp != -1)
+ {
+ /* This is not 100% correct, but follows from the desire to merge
+ multiplication by a power of 2 with the recognizer for a
+ shift. >=32 is not a valid shift for "asl", so we must try and
+ output a shift that produces the correct arithmetical result.
+ Using lsr #32 is identical except for the fact that the carry bit
+ is not set correctly if we set the flags; but we never use the
+ carry bit from such an operation, so we can ignore that. */
+ if (code == ROTATERT)
+ *amountp &= 31; /* Rotate is just modulo 32 */
+ else if (*amountp != (*amountp & 31))
+ {
+ if (code == ASHIFT)
+ mnem = "lsr";
+ *amountp = 32;
+ }
+
+ /* Shifts of 0 are no-ops. */
+ if (*amountp == 0)
+ return NULL;
+ }
+
+ return mnem;
+}
+
+
+/* Obtain the shift from the POWER of two. */
+static HOST_WIDE_INT
+int_log2 (power)
+ HOST_WIDE_INT power;
+{
+ HOST_WIDE_INT shift = 0;
+
+ while ((((HOST_INT (1)) << shift) & power) == 0)
+ {
+ if (shift > 31)
+ abort ();
+ shift++;
+ }
+
+ return shift;
+}
+
+/* Output a .ascii pseudo-op, keeping track of lengths. This is because
+ /bin/as is horribly restrictive. */
+#define MAX_ASCII_LEN 51
+
+void
+output_ascii_pseudo_op (stream, p, len)
+ FILE * stream;
+ const unsigned char * p;
+ int len;
+{
+ int i;
+ int len_so_far = 0;
+
+ fputs ("\t.ascii\t\"", stream);
+
+ for (i = 0; i < len; i++)
+ {
+ register int c = p[i];
+
+ if (len_so_far >= MAX_ASCII_LEN)
+ {
+ fputs ("\"\n\t.ascii\t\"", stream);
+ len_so_far = 0;
+ }
+
+ switch (c)
+ {
+ case TARGET_TAB:
+ fputs ("\\t", stream);
+ len_so_far += 2;
+ break;
+
+ case TARGET_FF:
+ fputs ("\\f", stream);
+ len_so_far += 2;
+ break;
+
+ case TARGET_BS:
+ fputs ("\\b", stream);
+ len_so_far += 2;
+ break;
+
+ case TARGET_CR:
+ fputs ("\\r", stream);
+ len_so_far += 2;
+ break;
+
+ case TARGET_NEWLINE:
+ fputs ("\\n", stream);
+ c = p [i + 1];
+ if ((c >= ' ' && c <= '~')
+ || c == TARGET_TAB)
+ /* This is a good place for a line break. */
+ len_so_far = MAX_ASCII_LEN;
else
- return;
+ len_so_far += 2;
+ break;
+
+ case '\"':
+ case '\\':
+ putc ('\\', stream);
+ len_so_far ++;
+ /* drop through. */
+
+ default:
+ if (c >= ' ' && c <= '~')
+ {
+ putc (c, stream);
+ len_so_far ++;
+ }
+ else
+ {
+ fprintf (stream, "\\%03o", c);
+ len_so_far += 4;
+ }
+ break;
}
- else if (GET_CODE (body) == RETURN)
+ }
+
+ fputs ("\"\n", stream);
+}
+\f
+
+/* Try to determine whether a pattern really clobbers the link register.
+ This information is useful when peepholing, so that lr need not be pushed
+ if we combine a call followed by a return.
+ NOTE: This code does not check for side-effect expressions in a SET_SRC:
+ such a check should not be needed because these only update an existing
+ value within a register; the register must still be set elsewhere within
+ the function. */
+static int
+pattern_really_clobbers_lr (x)
+ rtx x;
+{
+ int i;
+
+ switch (GET_CODE (x))
+ {
+ case SET:
+ switch (GET_CODE (SET_DEST (x)))
+ {
+ case REG:
+ return REGNO (SET_DEST (x)) == LR_REGNUM;
+
+ case SUBREG:
+ if (GET_CODE (XEXP (SET_DEST (x), 0)) == REG)
+ return REGNO (XEXP (SET_DEST (x), 0)) == LR_REGNUM;
+
+ if (GET_CODE (XEXP (SET_DEST (x), 0)) == MEM)
+ return 0;
+ abort ();
+
+ default:
+ return 0;
+ }
+
+ case PARALLEL:
+ for (i = 0; i < XVECLEN (x, 0); i++)
+ if (pattern_really_clobbers_lr (XVECEXP (x, 0, i)))
+ return 1;
+ return 0;
+
+ case CLOBBER:
+ switch (GET_CODE (XEXP (x, 0)))
{
- start_insn = next_nonnote_insn (start_insn);
- if (GET_CODE (start_insn) == BARRIER)
- start_insn = next_nonnote_insn (start_insn);
- if (GET_CODE (start_insn) == CODE_LABEL
- && CODE_LABEL_NUMBER (start_insn) == arm_target_label
- && LABEL_NUSES (start_insn) == 1)
+ case REG:
+ return REGNO (XEXP (x, 0)) == LR_REGNUM;
+
+ case SUBREG:
+ if (GET_CODE (XEXP (XEXP (x, 0), 0)) == REG)
+ return REGNO (XEXP (XEXP (x, 0), 0)) == LR_REGNUM;
+ abort ();
+
+ default:
+ return 0;
+ }
+
+ case UNSPEC:
+ return 1;
+
+ default:
+ return 0;
+ }
+}
+
+static int
+function_really_clobbers_lr (first)
+ rtx first;
+{
+ rtx insn, next;
+
+ for (insn = first; insn; insn = next_nonnote_insn (insn))
+ {
+ switch (GET_CODE (insn))
+ {
+ case BARRIER:
+ case NOTE:
+ case CODE_LABEL:
+ case JUMP_INSN: /* Jump insns only change the PC (and conds) */
+ break;
+
+ case INSN:
+ if (pattern_really_clobbers_lr (PATTERN (insn)))
+ return 1;
+ break;
+
+ case CALL_INSN:
+ /* Don't yet know how to handle those calls that are not to a
+ SYMBOL_REF. */
+ if (GET_CODE (PATTERN (insn)) != PARALLEL)
+ abort ();
+
+ switch (GET_CODE (XVECEXP (PATTERN (insn), 0, 0)))
+ {
+ case CALL:
+ if (GET_CODE (XEXP (XEXP (XVECEXP (PATTERN (insn), 0, 0), 0), 0))
+ != SYMBOL_REF)
+ return 1;
+ break;
+
+ case SET:
+ if (GET_CODE (XEXP (XEXP (SET_SRC (XVECEXP (PATTERN (insn),
+ 0, 0)), 0), 0))
+ != SYMBOL_REF)
+ return 1;
+ break;
+
+ default: /* Don't recognize it, be safe. */
+ return 1;
+ }
+
+ /* A call can be made (by peepholing) not to clobber lr iff it is
+ followed by a return. There may, however, be a use insn iff
+ we are returning the result of the call.
+ If we run off the end of the insn chain, then that means the
+ call was at the end of the function. Unfortunately we don't
+ have a return insn for the peephole to recognize, so we
+ must reject this. (Can this be fixed by adding our own insn?) */
+ if ((next = next_nonnote_insn (insn)) == NULL)
+ return 1;
+
+ /* No need to worry about lr if the call never returns. */
+ if (GET_CODE (next) == BARRIER)
+ break;
+
+ if (GET_CODE (next) == INSN
+ && GET_CODE (PATTERN (next)) == USE
+ && (GET_CODE (XVECEXP (PATTERN (insn), 0, 0)) == SET)
+ && (GET_CODE (XEXP (PATTERN (next), 0)) == REG)
+ && (REGNO (SET_DEST (XVECEXP (PATTERN (insn), 0, 0)))
+ == REGNO (XEXP (PATTERN (next), 0))))
+ if ((next = next_nonnote_insn (next)) == NULL)
+ return 1;
+
+ if (GET_CODE (next) == JUMP_INSN
+ && GET_CODE (PATTERN (next)) == RETURN)
+ break;
+ return 1;
+
+ default:
+ abort ();
+ }
+ }
+
+ /* We have reached the end of the chain so lr was _not_ clobbered. */
+ return 0;
+}
+
+char *
+output_return_instruction (operand, really_return, reverse)
+ rtx operand;
+ int really_return;
+ int reverse;
+{
+ char instr[100];
+ int reg, live_regs = 0;
+ int volatile_func = arm_volatile_func ();
+
+ /* If a function is naked, don't use the "return" insn. */
+ if (arm_naked_function_p (current_function_decl))
+ return "";
+
+ return_used_this_function = 1;
+
+ if (TARGET_ABORT_NORETURN && volatile_func)
+ {
+ /* If this function was declared non-returning, and we have found a tail
+ call, then we have to trust that the called function won't return. */
+ if (really_return)
+ {
+ rtx ops[2];
+
+ /* Otherwise, trap an attempted return by aborting. */
+ ops[0] = operand;
+ ops[1] = gen_rtx_SYMBOL_REF (Pmode, NEED_PLT_RELOC ? "abort(PLT)"
+ : "abort");
+ assemble_external_libcall (ops[1]);
+ output_asm_insn (reverse ? "bl%D0\t%a1" : "bl%d0\t%a1", ops);
+ }
+
+ return "";
+ }
+
+ if (current_function_calls_alloca && ! really_return)
+ abort ();
+
+ for (reg = 0; reg <= 10; reg++)
+ if (regs_ever_live[reg] && ! call_used_regs[reg])
+ live_regs++;
+
+ if (! TARGET_APCS_FRAME
+ && ! frame_pointer_needed
+ && regs_ever_live[HARD_FRAME_POINTER_REGNUM]
+ && ! call_used_regs[HARD_FRAME_POINTER_REGNUM])
+ live_regs++;
+
+ if (flag_pic && ! TARGET_SINGLE_PIC_BASE
+ && regs_ever_live[PIC_OFFSET_TABLE_REGNUM])
+ live_regs++;
+
+ if (live_regs || (regs_ever_live[LR_REGNUM] && ! lr_save_eliminated))
+ live_regs++;
+
+ if (frame_pointer_needed)
+ live_regs += 4;
+
+ /* On some ARM architectures it is faster to use LDR rather than LDM to
+ load a single register. On other architectures, the cost is the same. */
+ if (live_regs == 1
+ && regs_ever_live[LR_REGNUM]
+ && ! lr_save_eliminated
+ /* FIXME: We ought to handle the case TARGET_APCS_32 is true,
+ really_return is true, and only the PC needs restoring. */
+ && ! really_return)
+ output_asm_insn (reverse ? "ldr%?%D0\t%|lr, [%|sp], #4"
+ : "ldr%?%d0\t%|lr, [%|sp], #4", &operand);
+ else if (live_regs == 1
+ && regs_ever_live[LR_REGNUM]
+ && ! lr_save_eliminated
+ && TARGET_APCS_32)
+ output_asm_insn (reverse ? "ldr%?%D0\t%|pc, [%|sp], #4"
+ : "ldr%?%d0\t%|pc, [%|sp], #4", &operand);
+ else if (live_regs)
+ {
+ if (lr_save_eliminated || ! regs_ever_live[LR_REGNUM])
+ live_regs++;
+
+ if (frame_pointer_needed)
+ strcpy (instr,
+ reverse ? "ldm%?%D0ea\t%|fp, {" : "ldm%?%d0ea\t%|fp, {");
+ else
+ strcpy (instr,
+ reverse ? "ldm%?%D0fd\t%|sp!, {" : "ldm%?%d0fd\t%|sp!, {");
+
+ for (reg = 0; reg <= 10; reg++)
+ if (regs_ever_live[reg]
+ && (! call_used_regs[reg]
+ || (flag_pic && ! TARGET_SINGLE_PIC_BASE
+ && reg == PIC_OFFSET_TABLE_REGNUM)))
+ {
+ strcat (instr, "%|");
+ strcat (instr, reg_names[reg]);
+ if (--live_regs)
+ strcat (instr, ", ");
+ }
+
+ if (frame_pointer_needed)
+ {
+ strcat (instr, "%|");
+ strcat (instr, reg_names[11]);
+ strcat (instr, ", ");
+ strcat (instr, "%|");
+ strcat (instr, reg_names[13]);
+ strcat (instr, ", ");
+ strcat (instr, "%|");
+ strcat (instr, TARGET_INTERWORK || (! really_return)
+ ? reg_names[LR_REGNUM] : reg_names[PC_REGNUM] );
+ }
+ else
+ {
+ if (! TARGET_APCS_FRAME
+ && regs_ever_live[HARD_FRAME_POINTER_REGNUM]
+ && ! call_used_regs[HARD_FRAME_POINTER_REGNUM])
+ {
+ strcat (instr, "%|");
+ strcat (instr, reg_names[HARD_FRAME_POINTER_REGNUM]);
+ strcat (instr, ", ");
+ }
+
+ strcat (instr, "%|");
+
+ if (TARGET_INTERWORK && really_return)
+ strcat (instr, reg_names[IP_REGNUM]);
+ else
+ strcat (instr, really_return ? reg_names[PC_REGNUM] : reg_names[LR_REGNUM]);
+ }
+
+ strcat (instr, (TARGET_APCS_32 || !really_return) ? "}" : "}^");
+ output_asm_insn (instr, &operand);
+
+ if (TARGET_INTERWORK && really_return)
+ {
+ strcpy (instr, "bx%?");
+ strcat (instr, reverse ? "%D0" : "%d0");
+ strcat (instr, "\t%|");
+ strcat (instr, frame_pointer_needed ? "lr" : "ip");
+
+ output_asm_insn (instr, & operand);
+ }
+ }
+ else if (really_return)
+ {
+ if (TARGET_INTERWORK)
+ sprintf (instr, "bx%%?%%%s0\t%%|lr", reverse ? "D" : "d");
+ else
+ sprintf (instr, "mov%%?%%%s0%s\t%%|pc, %%|lr",
+ reverse ? "D" : "d", TARGET_APCS_32 ? "" : "s");
+
+ output_asm_insn (instr, & operand);
+ }
+
+ return "";
+}
+
+/* Return nonzero if optimizing and the current function is volatile.
+ Such functions never return, and many memory cycles can be saved
+ by not storing register values that will never be needed again.
+ This optimization was added to speed up context switching in a
+ kernel application. */
+int
+arm_volatile_func ()
+{
+ return (optimize > 0
+ && current_function_nothrow
+ && TREE_THIS_VOLATILE (current_function_decl));
+}
+
+/* Write the function name into the code section, directly preceding
+ the function prologue.
+
+ Code will be output similar to this:
+ t0
+ .ascii "arm_poke_function_name", 0
+ .align
+ t1
+ .word 0xff000000 + (t1 - t0)
+ arm_poke_function_name
+ mov ip, sp
+ stmfd sp!, {fp, ip, lr, pc}
+ sub fp, ip, #4
+
+ When performing a stack backtrace, code can inspect the value
+ of 'pc' stored at 'fp' + 0. If the trace function then looks
+ at location pc - 12 and the top 8 bits are set, then we know
+ that there is a function name embedded immediately preceding this
+ location and has length ((pc[-3]) & 0xff000000).
+
+ We assume that pc is declared as a pointer to an unsigned long.
+
+ It is of no benefit to output the function name if we are assembling
+ a leaf function. These function types will not contain a stack
+ backtrace structure, therefore it is not possible to determine the
+ function name. */
+
+void
+arm_poke_function_name (stream, name)
+ FILE * stream;
+ char * name;
+{
+ unsigned long alignlength;
+ unsigned long length;
+ rtx x;
+
+ length = strlen (name) + 1;
+ alignlength = ROUND_UP (length);
+
+ ASM_OUTPUT_ASCII (stream, name, length);
+ ASM_OUTPUT_ALIGN (stream, 2);
+ x = GEN_INT (HOST_UINT(0xff000000) + alignlength);
+ ASM_OUTPUT_INT (stream, x);
+}
+
+/* The amount of stack adjustment that happens here, in output_return and in
+ output_epilogue must be exactly the same as was calculated during reload,
+ or things will point to the wrong place. The only time we can safely
+ ignore this constraint is when a function has no arguments on the stack,
+ no stack frame requirement and no live registers execpt for `lr'. If we
+ can guarantee that by making all function calls into tail calls and that
+ lr is not clobbered in any other way, then there is no need to push lr
+ onto the stack. */
+void
+output_arm_prologue (f, frame_size)
+ FILE * f;
+ int frame_size;
+{
+ int reg, live_regs_mask = 0;
+ int volatile_func = arm_volatile_func ();
+
+ /* Nonzero if we must stuff some register arguments onto the stack as if
+ they were passed there. */
+ int store_arg_regs = 0;
+
+ if (arm_ccfsm_state || arm_target_insn)
+ abort (); /* Sanity check. */
+
+ if (arm_naked_function_p (current_function_decl))
+ return;
+
+ return_used_this_function = 0;
+ lr_save_eliminated = 0;
+
+ asm_fprintf (f, "\t%@ args = %d, pretend = %d, frame = %d\n",
+ current_function_args_size,
+ current_function_pretend_args_size, frame_size);
+ asm_fprintf (f, "\t%@ frame_needed = %d, current_function_anonymous_args = %d\n",
+ frame_pointer_needed,
+ current_function_anonymous_args);
+
+ if (volatile_func)
+ asm_fprintf (f, "\t%@ Volatile function.\n");
+
+ if (current_function_anonymous_args && current_function_pretend_args_size)
+ store_arg_regs = 1;
+
+ for (reg = 0; reg <= 10; reg++)
+ if (regs_ever_live[reg] && ! call_used_regs[reg])
+ live_regs_mask |= (1 << reg);
+
+ if (! TARGET_APCS_FRAME
+ && ! frame_pointer_needed
+ && regs_ever_live[HARD_FRAME_POINTER_REGNUM]
+ && ! call_used_regs[HARD_FRAME_POINTER_REGNUM])
+ live_regs_mask |= (1 << HARD_FRAME_POINTER_REGNUM);
+
+ if (flag_pic && ! TARGET_SINGLE_PIC_BASE
+ && regs_ever_live[PIC_OFFSET_TABLE_REGNUM])
+ live_regs_mask |= (1 << PIC_OFFSET_TABLE_REGNUM);
+
+ if (frame_pointer_needed)
+ live_regs_mask |= 0xD800;
+ else if (regs_ever_live[LR_REGNUM])
+ {
+ if (! current_function_args_size
+ && ! function_really_clobbers_lr (get_insns ()))
+ lr_save_eliminated = 1;
+ else
+ live_regs_mask |= 1 << LR_REGNUM;
+ }
+
+ if (live_regs_mask)
+ {
+ /* If a di mode load/store multiple is used, and the base register
+ is r3, then r4 can become an ever live register without lr
+ doing so, in this case we need to push lr as well, or we
+ will fail to get a proper return. */
+ live_regs_mask |= 1 << LR_REGNUM;
+ lr_save_eliminated = 0;
+
+ }
+
+ if (lr_save_eliminated)
+ asm_fprintf (f,"\t%@ I don't think this function clobbers lr\n");
+
+#ifdef AOF_ASSEMBLER
+ if (flag_pic)
+ asm_fprintf (f, "\tmov\t%r, %r\n", IP_REGNUM, PIC_OFFSET_TABLE_REGNUM);
+#endif
+}
+
+char *
+arm_output_epilogue ()
+{
+ int reg;
+ int live_regs_mask = 0;
+ /* If we need this, then it will always be at least this much. */
+ int floats_offset = 12;
+ rtx operands[3];
+ int frame_size = get_frame_size ();
+ rtx eh_ofs = cfun->machine->eh_epilogue_sp_ofs;
+ FILE * f = asm_out_file;
+ int volatile_func = arm_volatile_func ();
+ int return_regnum;
+
+ if (use_return_insn (FALSE) && return_used_this_function)
+ return "";
+
+ /* Naked functions don't have epilogues. */
+ if (arm_naked_function_p (current_function_decl))
+ return "";
+
+ /* If we are throwing an exception, the address we want to jump to is in
+ R1; otherwise, it's in LR. */
+ return_regnum = eh_ofs ? 2 : LR_REGNUM;
+
+ /* A volatile function should never return. Call abort. */
+ if (TARGET_ABORT_NORETURN && volatile_func)
+ {
+ rtx op;
+ op = gen_rtx_SYMBOL_REF (Pmode, NEED_PLT_RELOC ? "abort(PLT)" : "abort");
+ assemble_external_libcall (op);
+ output_asm_insn ("bl\t%a0", &op);
+ return "";
+ }
+
+ for (reg = 0; reg <= 10; reg++)
+ if (regs_ever_live[reg] && ! call_used_regs[reg])
+ {
+ live_regs_mask |= (1 << reg);
+ floats_offset += 4;
+ }
+
+ /* Handle the frame pointer as a special case. */
+ if (! TARGET_APCS_FRAME
+ && ! frame_pointer_needed
+ && regs_ever_live[HARD_FRAME_POINTER_REGNUM]
+ && ! call_used_regs[HARD_FRAME_POINTER_REGNUM])
+ {
+ live_regs_mask |= (1 << HARD_FRAME_POINTER_REGNUM);
+ floats_offset += 4;
+ }
+
+ /* If we aren't loading the PIC register, don't stack it even though it may
+ be live. */
+ if (flag_pic && ! TARGET_SINGLE_PIC_BASE
+ && regs_ever_live[PIC_OFFSET_TABLE_REGNUM])
+ {
+ live_regs_mask |= (1 << PIC_OFFSET_TABLE_REGNUM);
+ floats_offset += 4;
+ }
+
+ if (frame_pointer_needed)
+ {
+ if (arm_fpu_arch == FP_SOFT2)
+ {
+ for (reg = LAST_ARM_FP_REGNUM; reg >= FIRST_ARM_FP_REGNUM; reg--)
+ if (regs_ever_live[reg] && ! call_used_regs[reg])
+ {
+ floats_offset += 12;
+ asm_fprintf (f, "\tldfe\t%r, [%r, #-%d]\n",
+ reg, FP_REGNUM, floats_offset);
+ }
+ }
+ else
+ {
+ int start_reg = LAST_ARM_FP_REGNUM;
+
+ for (reg = LAST_ARM_FP_REGNUM; reg >= FIRST_ARM_FP_REGNUM; reg--)
+ {
+ if (regs_ever_live[reg] && ! call_used_regs[reg])
+ {
+ floats_offset += 12;
+
+ /* We can't unstack more than four registers at once. */
+ if (start_reg - reg == 3)
+ {
+ asm_fprintf (f, "\tlfm\t%r, 4, [%r, #-%d]\n",
+ reg, FP_REGNUM, floats_offset);
+ start_reg = reg - 1;
+ }
+ }
+ else
+ {
+ if (reg != start_reg)
+ asm_fprintf (f, "\tlfm\t%r, %d, [%r, #-%d]\n",
+ reg + 1, start_reg - reg,
+ FP_REGNUM, floats_offset);
+ start_reg = reg - 1;
+ }
+ }
+
+ /* Just in case the last register checked also needs unstacking. */
+ if (reg != start_reg)
+ asm_fprintf (f, "\tlfm\t%r, %d, [%r, #-%d]\n",
+ reg + 1, start_reg - reg,
+ FP_REGNUM, floats_offset);
+ }
+
+ if (TARGET_INTERWORK)
+ {
+ live_regs_mask |= 0x6800;
+ print_multi_reg (f, "ldmea\t%r", FP_REGNUM, live_regs_mask, FALSE);
+ if (eh_ofs)
+ asm_fprintf (f, "\tadd\t%r, %r, %r\n", SP_REGNUM, SP_REGNUM,
+ REGNO (eh_ofs));
+ asm_fprintf (f, "\tbx\t%r\n", return_regnum);
+ }
+ else if (eh_ofs)
+ {
+ live_regs_mask |= 0x6800;
+ print_multi_reg (f, "ldmea\t%r", FP_REGNUM, live_regs_mask, FALSE);
+ asm_fprintf (f, "\tadd\t%r, %r, %r\n", SP_REGNUM, SP_REGNUM,
+ REGNO (eh_ofs));
+ /* Even in 26-bit mode we do a mov (rather than a movs) because
+ we don't have the PSR bits set in the address. */
+ asm_fprintf (f, "\tmov\t%r, %r\n", PC_REGNUM, return_regnum);
+ }
+ else
+ {
+ live_regs_mask |= 0xA800;
+ print_multi_reg (f, "ldmea\t%r", FP_REGNUM, live_regs_mask,
+ TARGET_APCS_32 ? FALSE : TRUE);
+ }
+ }
+ else
+ {
+ /* Restore stack pointer if necessary. */
+ if (frame_size + current_function_outgoing_args_size != 0)
+ {
+ operands[0] = operands[1] = stack_pointer_rtx;
+ operands[2] = GEN_INT (frame_size
+ + current_function_outgoing_args_size);
+ output_add_immediate (operands);
+ }
+
+ if (arm_fpu_arch == FP_SOFT2)
+ {
+ for (reg = FIRST_ARM_FP_REGNUM; reg <= LAST_ARM_FP_REGNUM; reg++)
+ if (regs_ever_live[reg] && ! call_used_regs[reg])
+ asm_fprintf (f, "\tldfe\t%r, [%r], #12\n",
+ reg, SP_REGNUM);
+ }
+ else
+ {
+ int start_reg = FIRST_ARM_FP_REGNUM;
+
+ for (reg = FIRST_ARM_FP_REGNUM; reg <= LAST_ARM_FP_REGNUM; reg++)
+ {
+ if (regs_ever_live[reg] && ! call_used_regs[reg])
+ {
+ if (reg - start_reg == 3)
+ {
+ asm_fprintf (f, "\tlfmfd\t%r, 4, [%r]!\n",
+ start_reg, SP_REGNUM);
+ start_reg = reg + 1;
+ }
+ }
+ else
+ {
+ if (reg != start_reg)
+ asm_fprintf (f, "\tlfmfd\t%r, %d, [%r]!\n",
+ start_reg, reg - start_reg,
+ SP_REGNUM);
+
+ start_reg = reg + 1;
+ }
+ }
+
+ /* Just in case the last register checked also needs unstacking. */
+ if (reg != start_reg)
+ asm_fprintf (f, "\tlfmfd\t%r, %d, [%r]!\n",
+ start_reg, reg - start_reg, SP_REGNUM);
+ }
+
+ if (current_function_pretend_args_size == 0 && regs_ever_live[LR_REGNUM])
+ {
+ if (TARGET_INTERWORK)
+ {
+ if (! lr_save_eliminated)
+ live_regs_mask |= 1 << LR_REGNUM;
+
+ /* Handle LR on its own. */
+ if (live_regs_mask == (1 << LR_REGNUM))
+ {
+ if (eh_ofs)
+ asm_fprintf (f, "\tadd\t%r, %r, #4\n", SP_REGNUM,
+ SP_REGNUM);
+ else
+ asm_fprintf (f, "\tldr\t%r, [%r], #4\n", LR_REGNUM,
+ SP_REGNUM);
+ }
+ else if (live_regs_mask != 0)
+ print_multi_reg (f, "ldmfd\t%r!", SP_REGNUM, live_regs_mask,
+ FALSE);
+
+ if (eh_ofs)
+ asm_fprintf (f, "\tadd\t%r, %r, %r\n", SP_REGNUM, SP_REGNUM,
+ REGNO (eh_ofs));
+
+ asm_fprintf (f, "\tbx\t%r\n", return_regnum);
+ }
+ else if (lr_save_eliminated)
+ asm_fprintf (f,
+ TARGET_APCS_32 ? "\tmov\t%r, %r\n" : "\tmovs\t%r, %r\n",
+ PC_REGNUM, LR_REGNUM);
+ else if (eh_ofs)
+ {
+ if (live_regs_mask == 0)
+ asm_fprintf (f, "\tadd\t%r, %r, #4\n", SP_REGNUM, SP_REGNUM);
+ else
+ print_multi_reg (f, "\tldmfd\t%r!", SP_REGNUM,
+ live_regs_mask | (1 << LR_REGNUM), FALSE);
+
+ asm_fprintf (f, "\tadd\t%r, %r, %r\n", SP_REGNUM, SP_REGNUM,
+ REGNO (eh_ofs));
+ /* Jump to the target; even in 26-bit mode. */
+ asm_fprintf (f, "\tmov\t%r, %r\n", PC_REGNUM, return_regnum);
+ }
+ else if (TARGET_APCS_32 && live_regs_mask == 0)
+ asm_fprintf (f, "\tldr\t%r, [%r], #4\n", PC_REGNUM, SP_REGNUM);
+ else
+ print_multi_reg (f, "ldmfd\t%r!", SP_REGNUM,
+ live_regs_mask | (1 << PC_REGNUM),
+ TARGET_APCS_32 ? FALSE : TRUE);
+ }
+ else
+ {
+ if (live_regs_mask || regs_ever_live[LR_REGNUM])
+ {
+ /* Restore the integer regs, and the return address into lr. */
+ if (! lr_save_eliminated)
+ live_regs_mask |= 1 << LR_REGNUM;
+
+ if (live_regs_mask == (1 << LR_REGNUM))
+ {
+ if (eh_ofs)
+ asm_fprintf (f, "\tadd\t%r, %r, #4\n", SP_REGNUM,
+ SP_REGNUM);
+ else
+ asm_fprintf (f, "\tldr\t%r, [%r], #4\n", LR_REGNUM,
+ SP_REGNUM);
+ }
+ else if (live_regs_mask != 0)
+ print_multi_reg (f, "ldmfd\t%r!", SP_REGNUM, live_regs_mask,
+ FALSE);
+ }
+
+ if (current_function_pretend_args_size)
+ {
+ /* Unwind the pre-pushed regs. */
+ operands[0] = operands[1] = stack_pointer_rtx;
+ operands[2] = GEN_INT (current_function_pretend_args_size);
+ output_add_immediate (operands);
+ }
+
+ if (eh_ofs)
+ asm_fprintf (f, "\tadd\t%r, %r, %r\n", SP_REGNUM, SP_REGNUM,
+ REGNO (eh_ofs));
+
+ /* And finally, go home. */
+ if (TARGET_INTERWORK)
+ asm_fprintf (f, "\tbx\t%r\n", return_regnum);
+ else if (TARGET_APCS_32 || eh_ofs)
+ asm_fprintf (f, "\tmov\t%r, %r\n", PC_REGNUM, return_regnum);
+ else
+ asm_fprintf (f, "\tmovs\t%r, %r\n", PC_REGNUM, return_regnum);
+ }
+ }
+
+ return "";
+}
+
+void
+output_func_epilogue (frame_size)
+ int frame_size;
+{
+ if (TARGET_THUMB)
+ {
+ /* ??? Probably not safe to set this here, since it assumes that a
+ function will be emitted as assembly immediately after we generate
+ RTL for it. This does not happen for inline functions. */
+ return_used_this_function = 0;
+ }
+ else
+ {
+ if (use_return_insn (FALSE)
+ && return_used_this_function
+ && (frame_size + current_function_outgoing_args_size) != 0
+ && ! frame_pointer_needed)
+ abort ();
+
+ /* Reset the ARM-specific per-function variables. */
+ current_function_anonymous_args = 0;
+ after_arm_reorg = 0;
+ }
+}
+
+/* Generate and emit an insn that we will recognize as a push_multi.
+ Unfortunately, since this insn does not reflect very well the actual
+ semantics of the operation, we need to annotate the insn for the benefit
+ of DWARF2 frame unwind information. */
+static rtx
+emit_multi_reg_push (mask)
+ int mask;
+{
+ int num_regs = 0;
+ int i, j;
+ rtx par;
+ rtx dwarf;
+ rtx tmp, reg;
+
+ for (i = 0; i <= LAST_ARM_REGNUM; i++)
+ if (mask & (1 << i))
+ num_regs ++;
+
+ if (num_regs == 0 || num_regs > 16)
+ abort ();
+
+ par = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (num_regs));
+ dwarf = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (num_regs));
+ RTX_FRAME_RELATED_P (dwarf) = 1;
+
+ for (i = 0; i <= LAST_ARM_REGNUM; i++)
+ {
+ if (mask & (1 << i))
+ {
+ reg = gen_rtx_REG (SImode, i);
+
+ XVECEXP (par, 0, 0)
+ = gen_rtx_SET (VOIDmode,
+ gen_rtx_MEM (BLKmode,
+ gen_rtx_PRE_DEC (BLKmode,
+ stack_pointer_rtx)),
+ gen_rtx_UNSPEC (BLKmode,
+ gen_rtvec (1, reg),
+ 2));
+
+ tmp = gen_rtx_SET (VOIDmode,
+ gen_rtx_MEM (SImode,
+ gen_rtx_PRE_DEC (BLKmode,
+ stack_pointer_rtx)),
+ reg);
+ RTX_FRAME_RELATED_P (tmp) = 1;
+ XVECEXP (dwarf, 0, num_regs - 1) = tmp;
+
+ break;
+ }
+ }
+
+ for (j = 1, i++; j < num_regs; i++)
+ {
+ if (mask & (1 << i))
+ {
+ reg = gen_rtx_REG (SImode, i);
+
+ XVECEXP (par, 0, j) = gen_rtx_USE (VOIDmode, reg);
+
+ tmp = gen_rtx_SET (VOIDmode,
+ gen_rtx_MEM (SImode,
+ gen_rtx_PRE_DEC (BLKmode,
+ stack_pointer_rtx)),
+ reg);
+ RTX_FRAME_RELATED_P (tmp) = 1;
+ XVECEXP (dwarf, 0, num_regs - j - 1) = tmp;
+
+ j++;
+ }
+ }
+
+ par = emit_insn (par);
+ REG_NOTES (par) = gen_rtx_EXPR_LIST (REG_FRAME_RELATED_EXPR, dwarf,
+ REG_NOTES (par));
+ return par;
+}
+
+static rtx
+emit_sfm (base_reg, count)
+ int base_reg;
+ int count;
+{
+ rtx par;
+ rtx dwarf;
+ rtx tmp, reg;
+ int i;
+
+ par = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (count));
+ dwarf = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (count));
+ RTX_FRAME_RELATED_P (dwarf) = 1;
+
+ reg = gen_rtx_REG (XFmode, base_reg++);
+
+ XVECEXP (par, 0, 0)
+ = gen_rtx_SET (VOIDmode,
+ gen_rtx_MEM (BLKmode,
+ gen_rtx_PRE_DEC (BLKmode, stack_pointer_rtx)),
+ gen_rtx_UNSPEC (BLKmode,
+ gen_rtvec (1, reg),
+ 2));
+ tmp
+ = gen_rtx_SET (VOIDmode,
+ gen_rtx_MEM (XFmode,
+ gen_rtx_PRE_DEC (BLKmode, stack_pointer_rtx)),
+ reg);
+ RTX_FRAME_RELATED_P (tmp) = 1;
+ XVECEXP (dwarf, 0, count - 1) = tmp;
+
+ for (i = 1; i < count; i++)
+ {
+ reg = gen_rtx_REG (XFmode, base_reg++);
+ XVECEXP (par, 0, i) = gen_rtx_USE (VOIDmode, reg);
+
+ tmp = gen_rtx_SET (VOIDmode,
+ gen_rtx_MEM (XFmode,
+ gen_rtx_PRE_DEC (BLKmode,
+ stack_pointer_rtx)),
+ reg);
+ RTX_FRAME_RELATED_P (tmp) = 1;
+ XVECEXP (dwarf, 0, count - i - 1) = tmp;
+ }
+
+ par = emit_insn (par);
+ REG_NOTES (par) = gen_rtx_EXPR_LIST (REG_FRAME_RELATED_EXPR, dwarf,
+ REG_NOTES (par));
+ return par;
+}
+
+void
+arm_expand_prologue ()
+{
+ int reg;
+ rtx amount = GEN_INT (-(get_frame_size ()
+ + current_function_outgoing_args_size));
+ int live_regs_mask = 0;
+ int store_arg_regs = 0;
+ /* If this function doesn't return, then there is no need to push
+ the call-saved regs. */
+ int volatile_func = arm_volatile_func ();
+ rtx insn;
+
+ /* Naked functions don't have prologues. */
+ if (arm_naked_function_p (current_function_decl))
+ return;
+
+ if (current_function_anonymous_args && current_function_pretend_args_size)
+ store_arg_regs = 1;
+
+ if (! volatile_func)
+ {
+ for (reg = 0; reg <= 10; reg++)
+ if (regs_ever_live[reg] && ! call_used_regs[reg])
+ live_regs_mask |= 1 << reg;
+
+ if (! TARGET_APCS_FRAME
+ && ! frame_pointer_needed
+ && regs_ever_live[HARD_FRAME_POINTER_REGNUM]
+ && ! call_used_regs[HARD_FRAME_POINTER_REGNUM])
+ live_regs_mask |= 1 << HARD_FRAME_POINTER_REGNUM;
+
+ if (flag_pic && regs_ever_live[PIC_OFFSET_TABLE_REGNUM])
+ live_regs_mask |= 1 << PIC_OFFSET_TABLE_REGNUM;
+
+ if (regs_ever_live[LR_REGNUM])
+ live_regs_mask |= 1 << LR_REGNUM;
+ }
+
+ if (frame_pointer_needed)
+ {
+ live_regs_mask |= 0xD800;
+ insn = emit_insn (gen_movsi (gen_rtx_REG (SImode, IP_REGNUM),
+ stack_pointer_rtx));
+ RTX_FRAME_RELATED_P (insn) = 1;
+ }
+
+ if (current_function_pretend_args_size)
+ {
+ if (store_arg_regs)
+ insn = emit_multi_reg_push
+ ((0xf0 >> (current_function_pretend_args_size / 4)) & 0xf);
+ else
+ insn = emit_insn
+ (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
+ GEN_INT (-current_function_pretend_args_size)));
+ RTX_FRAME_RELATED_P (insn) = 1;
+ }
+
+ if (live_regs_mask)
+ {
+ /* If we have to push any regs, then we must push lr as well, or
+ we won't get a proper return. */
+ live_regs_mask |= 1 << LR_REGNUM;
+ insn = emit_multi_reg_push (live_regs_mask);
+ RTX_FRAME_RELATED_P (insn) = 1;
+ }
+
+ /* For now the integer regs are still pushed in output_arm_epilogue (). */
+
+ if (! volatile_func)
+ {
+ if (arm_fpu_arch == FP_SOFT2)
+ {
+ for (reg = LAST_ARM_FP_REGNUM; reg >= FIRST_ARM_FP_REGNUM; reg --)
+ if (regs_ever_live[reg] && ! call_used_regs[reg])
+ {
+ insn = gen_rtx_PRE_DEC (XFmode, stack_pointer_rtx);
+ insn = gen_rtx_MEM (XFmode, insn);
+ insn = emit_insn (gen_rtx_SET (VOIDmode, insn,
+ gen_rtx_REG (XFmode, reg)));
+ RTX_FRAME_RELATED_P (insn) = 1;
+ }
+ }
+ else
+ {
+ int start_reg = LAST_ARM_FP_REGNUM;
+
+ for (reg = LAST_ARM_FP_REGNUM; reg >= FIRST_ARM_FP_REGNUM; reg --)
+ {
+ if (regs_ever_live[reg] && ! call_used_regs[reg])
+ {
+ if (start_reg - reg == 3)
+ {
+ insn = emit_sfm (reg, 4);
+ RTX_FRAME_RELATED_P (insn) = 1;
+ start_reg = reg - 1;
+ }
+ }
+ else
+ {
+ if (start_reg != reg)
+ {
+ insn = emit_sfm (reg + 1, start_reg - reg);
+ RTX_FRAME_RELATED_P (insn) = 1;
+ }
+ start_reg = reg - 1;
+ }
+ }
+
+ if (start_reg != reg)
+ {
+ insn = emit_sfm (reg + 1, start_reg - reg);
+ RTX_FRAME_RELATED_P (insn) = 1;
+ }
+ }
+ }
+
+ if (frame_pointer_needed)
+ {
+ insn = GEN_INT (-(4 + current_function_pretend_args_size));
+ insn = emit_insn (gen_addsi3 (hard_frame_pointer_rtx,
+ gen_rtx_REG (SImode, IP_REGNUM),
+ insn));
+ RTX_FRAME_RELATED_P (insn) = 1;
+ }
+
+ if (amount != const0_rtx)
+ {
+ insn = emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
+ amount));
+ RTX_FRAME_RELATED_P (insn) = 1;
+ emit_insn (gen_rtx_CLOBBER (VOIDmode,
+ gen_rtx_MEM (BLKmode, stack_pointer_rtx)));
+ }
+
+ /* If we are profiling, make sure no instructions are scheduled before
+ the call to mcount. Similarly if the user has requested no
+ scheduling in the prolog. */
+ if (profile_flag || profile_block_flag || TARGET_NO_SCHED_PRO)
+ emit_insn (gen_blockage ());
+}
+\f
+/* If CODE is 'd', then the X is a condition operand and the instruction
+ should only be executed if the condition is true.
+ if CODE is 'D', then the X is a condition operand and the instruction
+ should only be executed if the condition is false: however, if the mode
+ of the comparison is CCFPEmode, then always execute the instruction -- we
+ do this because in these circumstances !GE does not necessarily imply LT;
+ in these cases the instruction pattern will take care to make sure that
+ an instruction containing %d will follow, thereby undoing the effects of
+ doing this instruction unconditionally.
+ If CODE is 'N' then X is a floating point operand that must be negated
+ before output.
+ If CODE is 'B' then output a bitwise inverted value of X (a const int).
+ If X is a REG and CODE is `M', output a ldm/stm style multi-reg. */
+
+void
+arm_print_operand (stream, x, code)
+ FILE * stream;
+ rtx x;
+ int code;
+{
+ switch (code)
+ {
+ case '@':
+ fputs (ASM_COMMENT_START, stream);
+ return;
+
+ case '_':
+ fputs (user_label_prefix, stream);
+ return;
+
+ case '|':
+ fputs (REGISTER_PREFIX, stream);
+ return;
+
+ case '?':
+ if (arm_ccfsm_state == 3 || arm_ccfsm_state == 4)
+ fputs (arm_condition_codes[arm_current_cc], stream);
+ return;
+
+ case 'N':
+ {
+ REAL_VALUE_TYPE r;
+ REAL_VALUE_FROM_CONST_DOUBLE (r, x);
+ r = REAL_VALUE_NEGATE (r);
+ fprintf (stream, "%s", fp_const_from_val (&r));
+ }
+ return;
+
+ case 'B':
+ if (GET_CODE (x) == CONST_INT)
+ {
+ HOST_WIDE_INT val;
+ val = ARM_SIGN_EXTEND (~ INTVAL (x));
+ fprintf (stream, HOST_WIDE_INT_PRINT_DEC, val);
+ }
+ else
+ {
+ putc ('~', stream);
+ output_addr_const (stream, x);
+ }
+ return;
+
+ case 'i':
+ fprintf (stream, "%s", arithmetic_instr (x, 1));
+ return;
+
+ case 'I':
+ fprintf (stream, "%s", arithmetic_instr (x, 0));
+ return;
+
+ case 'S':
+ {
+ HOST_WIDE_INT val;
+ char * shift = shift_op (x, & val);
+
+ if (shift)
+ {
+ fprintf (stream, ", %s ", shift_op (x, & val));
+ if (val == -1)
+ arm_print_operand (stream, XEXP (x, 1), 0);
+ else
+ {
+ fputc ('#', stream);
+ fprintf (stream, HOST_WIDE_INT_PRINT_DEC, val);
+ }
+ }
+ }
+ return;
+
+ /* An explanation of the 'Q', 'R' and 'H' register operands:
+
+ In a pair of registers containing a DI or DF value the 'Q'
+ operand returns the register number of the register containing
+ the least signficant part of the value. The 'R' operand returns
+ the register number of the register containing the most
+ significant part of the value.
+
+ The 'H' operand returns the higher of the two register numbers.
+ On a run where WORDS_BIG_ENDIAN is true the 'H' operand is the
+ same as the 'Q' operand, since the most signficant part of the
+ value is held in the lower number register. The reverse is true
+ on systems where WORDS_BIG_ENDIAN is false.
+
+ The purpose of these operands is to distinguish between cases
+ where the endian-ness of the values is important (for example
+ when they are added together), and cases where the endian-ness
+ is irrelevant, but the order of register operations is important.
+ For example when loading a value from memory into a register
+ pair, the endian-ness does not matter. Provided that the value
+ from the lower memory address is put into the lower numbered
+ register, and the value from the higher address is put into the
+ higher numbered register, the load will work regardless of whether
+ the value being loaded is big-wordian or little-wordian. The
+ order of the two register loads can matter however, if the address
+ of the memory location is actually held in one of the registers
+ being overwritten by the load. */
+ case 'Q':
+ if (REGNO (x) > LAST_ARM_REGNUM)
+ abort ();
+ asm_fprintf (stream, "%r", REGNO (x) + (WORDS_BIG_ENDIAN ? 1 : 0));
+ return;
+
+ case 'R':
+ if (REGNO (x) > LAST_ARM_REGNUM)
+ abort ();
+ asm_fprintf (stream, "%r", REGNO (x) + (WORDS_BIG_ENDIAN ? 0 : 1));
+ return;
+
+ case 'H':
+ if (REGNO (x) > LAST_ARM_REGNUM)
+ abort ();
+ asm_fprintf (stream, "%r", REGNO (x) + 1);
+ return;
+
+ case 'm':
+ asm_fprintf (stream, "%r",
+ GET_CODE (XEXP (x, 0)) == REG
+ ? REGNO (XEXP (x, 0)) : REGNO (XEXP (XEXP (x, 0), 0)));
+ return;
+
+ case 'M':
+ asm_fprintf (stream, "{%r-%r}",
+ REGNO (x),
+ REGNO (x) + NUM_REGS (GET_MODE (x)) - 1);
+ return;
+
+ case 'd':
+ if (! x)
+ return;
+
+ if (TARGET_ARM)
+ fputs (arm_condition_codes[get_arm_condition_code (x)],
+ stream);
+ else
+ fputs (thumb_condition_code (x, 0), stream);
+ return;
+
+ case 'D':
+ if (! x)
+ return;
+
+ if (TARGET_ARM)
+ fputs (arm_condition_codes[ARM_INVERSE_CONDITION_CODE
+ (get_arm_condition_code (x))],
+ stream);
+ else
+ fputs (thumb_condition_code (x, 1), stream);
+ return;
+
+ default:
+ if (x == 0)
+ abort ();
+
+ if (GET_CODE (x) == REG)
+ asm_fprintf (stream, "%r", REGNO (x));
+ else if (GET_CODE (x) == MEM)
+ {
+ output_memory_reference_mode = GET_MODE (x);
+ output_address (XEXP (x, 0));
+ }
+ else if (GET_CODE (x) == CONST_DOUBLE)
+ fprintf (stream, "#%s", fp_immediate_constant (x));
+ else if (GET_CODE (x) == NEG)
+ abort (); /* This should never happen now. */
+ else
+ {
+ fputc ('#', stream);
+ output_addr_const (stream, x);
+ }
+ }
+}
+\f
+/* A finite state machine takes care of noticing whether or not instructions
+ can be conditionally executed, and thus decrease execution time and code
+ size by deleting branch instructions. The fsm is controlled by
+ final_prescan_insn, and controls the actions of ASM_OUTPUT_OPCODE. */
+
+/* The state of the fsm controlling condition codes are:
+ 0: normal, do nothing special
+ 1: make ASM_OUTPUT_OPCODE not output this instruction
+ 2: make ASM_OUTPUT_OPCODE not output this instruction
+ 3: make instructions conditional
+ 4: make instructions conditional
+
+ State transitions (state->state by whom under condition):
+ 0 -> 1 final_prescan_insn if the `target' is a label
+ 0 -> 2 final_prescan_insn if the `target' is an unconditional branch
+ 1 -> 3 ASM_OUTPUT_OPCODE after not having output the conditional branch
+ 2 -> 4 ASM_OUTPUT_OPCODE after not having output the conditional branch
+ 3 -> 0 ASM_OUTPUT_INTERNAL_LABEL if the `target' label is reached
+ (the target label has CODE_LABEL_NUMBER equal to arm_target_label).
+ 4 -> 0 final_prescan_insn if the `target' unconditional branch is reached
+ (the target insn is arm_target_insn).
+
+ If the jump clobbers the conditions then we use states 2 and 4.
+
+ A similar thing can be done with conditional return insns.
+
+ XXX In case the `target' is an unconditional branch, this conditionalising
+ of the instructions always reduces code size, but not always execution
+ time. But then, I want to reduce the code size to somewhere near what
+ /bin/cc produces. */
+
+/* Returns the index of the ARM condition code string in
+ `arm_condition_codes'. COMPARISON should be an rtx like
+ `(eq (...) (...))'. */
+
+static enum arm_cond_code
+get_arm_condition_code (comparison)
+ rtx comparison;
+{
+ enum machine_mode mode = GET_MODE (XEXP (comparison, 0));
+ register int code;
+ register enum rtx_code comp_code = GET_CODE (comparison);
+
+ if (GET_MODE_CLASS (mode) != MODE_CC)
+ mode = SELECT_CC_MODE (comp_code, XEXP (comparison, 0),
+ XEXP (comparison, 1));
+
+ switch (mode)
+ {
+ case CC_DNEmode: code = ARM_NE; goto dominance;
+ case CC_DEQmode: code = ARM_EQ; goto dominance;
+ case CC_DGEmode: code = ARM_GE; goto dominance;
+ case CC_DGTmode: code = ARM_GT; goto dominance;
+ case CC_DLEmode: code = ARM_LE; goto dominance;
+ case CC_DLTmode: code = ARM_LT; goto dominance;
+ case CC_DGEUmode: code = ARM_CS; goto dominance;
+ case CC_DGTUmode: code = ARM_HI; goto dominance;
+ case CC_DLEUmode: code = ARM_LS; goto dominance;
+ case CC_DLTUmode: code = ARM_CC;
+
+ dominance:
+ if (comp_code != EQ && comp_code != NE)
+ abort ();
+
+ if (comp_code == EQ)
+ return ARM_INVERSE_CONDITION_CODE (code);
+ return code;
+
+ case CC_NOOVmode:
+ switch (comp_code)
+ {
+ case NE: return ARM_NE;
+ case EQ: return ARM_EQ;
+ case GE: return ARM_PL;
+ case LT: return ARM_MI;
+ default: abort ();
+ }
+
+ case CC_Zmode:
+ case CCFPmode:
+ switch (comp_code)
+ {
+ case NE: return ARM_NE;
+ case EQ: return ARM_EQ;
+ default: abort ();
+ }
+
+ case CCFPEmode:
+ switch (comp_code)
+ {
+ case GE: return ARM_GE;
+ case GT: return ARM_GT;
+ case LE: return ARM_LS;
+ case LT: return ARM_MI;
+ default: abort ();
+ }
+
+ case CC_SWPmode:
+ switch (comp_code)
+ {
+ case NE: return ARM_NE;
+ case EQ: return ARM_EQ;
+ case GE: return ARM_LE;
+ case GT: return ARM_LT;
+ case LE: return ARM_GE;
+ case LT: return ARM_GT;
+ case GEU: return ARM_LS;
+ case GTU: return ARM_CC;
+ case LEU: return ARM_CS;
+ case LTU: return ARM_HI;
+ default: abort ();
+ }
+
+ case CC_Cmode:
+ switch (comp_code)
+ {
+ case LTU: return ARM_CS;
+ case GEU: return ARM_CC;
+ default: abort ();
+ }
+
+ case CCmode:
+ switch (comp_code)
+ {
+ case NE: return ARM_NE;
+ case EQ: return ARM_EQ;
+ case GE: return ARM_GE;
+ case GT: return ARM_GT;
+ case LE: return ARM_LE;
+ case LT: return ARM_LT;
+ case GEU: return ARM_CS;
+ case GTU: return ARM_HI;
+ case LEU: return ARM_LS;
+ case LTU: return ARM_CC;
+ default: abort ();
+ }
+
+ default: abort ();
+ }
+
+ abort ();
+}
+
+
+void
+arm_final_prescan_insn (insn)
+ rtx insn;
+{
+ /* BODY will hold the body of INSN. */
+ register rtx body = PATTERN (insn);
+
+ /* This will be 1 if trying to repeat the trick, and things need to be
+ reversed if it appears to fail. */
+ int reverse = 0;
+
+ /* JUMP_CLOBBERS will be one implies that the conditions if a branch is
+ taken are clobbered, even if the rtl suggests otherwise. It also
+ means that we have to grub around within the jump expression to find
+ out what the conditions are when the jump isn't taken. */
+ int jump_clobbers = 0;
+
+ /* If we start with a return insn, we only succeed if we find another one. */
+ int seeking_return = 0;
+
+ /* START_INSN will hold the insn from where we start looking. This is the
+ first insn after the following code_label if REVERSE is true. */
+ rtx start_insn = insn;
+
+ /* If in state 4, check if the target branch is reached, in order to
+ change back to state 0. */
+ if (arm_ccfsm_state == 4)
+ {
+ if (insn == arm_target_insn)
+ {
+ arm_target_insn = NULL;
+ arm_ccfsm_state = 0;
+ }
+ return;
+ }
+
+ /* If in state 3, it is possible to repeat the trick, if this insn is an
+ unconditional branch to a label, and immediately following this branch
+ is the previous target label which is only used once, and the label this
+ branch jumps to is not too far off. */
+ if (arm_ccfsm_state == 3)
+ {
+ if (simplejump_p (insn))
+ {
+ start_insn = next_nonnote_insn (start_insn);
+ if (GET_CODE (start_insn) == BARRIER)
+ {
+ /* XXX Isn't this always a barrier? */
+ start_insn = next_nonnote_insn (start_insn);
+ }
+ if (GET_CODE (start_insn) == CODE_LABEL
+ && CODE_LABEL_NUMBER (start_insn) == arm_target_label
+ && LABEL_NUSES (start_insn) == 1)
+ reverse = TRUE;
+ else
+ return;
+ }
+ else if (GET_CODE (body) == RETURN)
+ {
+ start_insn = next_nonnote_insn (start_insn);
+ if (GET_CODE (start_insn) == BARRIER)
+ start_insn = next_nonnote_insn (start_insn);
+ if (GET_CODE (start_insn) == CODE_LABEL
+ && CODE_LABEL_NUMBER (start_insn) == arm_target_label
+ && LABEL_NUSES (start_insn) == 1)
+ {
+ reverse = TRUE;
+ seeking_return = 1;
+ }
+ else
+ return;
+ }
+ else
+ return;
+ }
+
+ if (arm_ccfsm_state != 0 && !reverse)
+ abort ();
+ if (GET_CODE (insn) != JUMP_INSN)
+ return;
+
+ /* This jump might be paralleled with a clobber of the condition codes
+ the jump should always come first */
+ if (GET_CODE (body) == PARALLEL && XVECLEN (body, 0) > 0)
+ body = XVECEXP (body, 0, 0);
+
+#if 0
+ /* If this is a conditional return then we don't want to know */
+ if (GET_CODE (body) == SET && GET_CODE (SET_DEST (body)) == PC
+ && GET_CODE (SET_SRC (body)) == IF_THEN_ELSE
+ && (GET_CODE (XEXP (SET_SRC (body), 1)) == RETURN
+ || GET_CODE (XEXP (SET_SRC (body), 2)) == RETURN))
+ return;
+#endif
+
+ if (reverse
+ || (GET_CODE (body) == SET && GET_CODE (SET_DEST (body)) == PC
+ && GET_CODE (SET_SRC (body)) == IF_THEN_ELSE))
+ {
+ int insns_skipped;
+ int fail = FALSE, succeed = FALSE;
+ /* Flag which part of the IF_THEN_ELSE is the LABEL_REF. */
+ int then_not_else = TRUE;
+ rtx this_insn = start_insn, label = 0;
+
+ if (get_attr_conds (insn) == CONDS_JUMP_CLOB)
+ {
+ /* The code below is wrong for these, and I haven't time to
+ fix it now. So we just do the safe thing and return. This
+ whole function needs re-writing anyway. */
+ jump_clobbers = 1;
+ return;
+ }
+
+ /* Register the insn jumped to. */
+ if (reverse)
+ {
+ if (!seeking_return)
+ label = XEXP (SET_SRC (body), 0);
+ }
+ else if (GET_CODE (XEXP (SET_SRC (body), 1)) == LABEL_REF)
+ label = XEXP (XEXP (SET_SRC (body), 1), 0);
+ else if (GET_CODE (XEXP (SET_SRC (body), 2)) == LABEL_REF)
+ {
+ label = XEXP (XEXP (SET_SRC (body), 2), 0);
+ then_not_else = FALSE;
+ }
+ else if (GET_CODE (XEXP (SET_SRC (body), 1)) == RETURN)
+ seeking_return = 1;
+ else if (GET_CODE (XEXP (SET_SRC (body), 2)) == RETURN)
+ {
+ seeking_return = 1;
+ then_not_else = FALSE;
+ }
+ else
+ abort ();
+
+ /* See how many insns this branch skips, and what kind of insns. If all
+ insns are okay, and the label or unconditional branch to the same
+ label is not too far away, succeed. */
+ for (insns_skipped = 0;
+ !fail && !succeed && insns_skipped++ < max_insns_skipped;)
+ {
+ rtx scanbody;
+
+ this_insn = next_nonnote_insn (this_insn);
+ if (!this_insn)
+ break;
+
+ switch (GET_CODE (this_insn))
+ {
+ case CODE_LABEL:
+ /* Succeed if it is the target label, otherwise fail since
+ control falls in from somewhere else. */
+ if (this_insn == label)
+ {
+ if (jump_clobbers)
+ {
+ arm_ccfsm_state = 2;
+ this_insn = next_nonnote_insn (this_insn);
+ }
+ else
+ arm_ccfsm_state = 1;
+ succeed = TRUE;
+ }
+ else
+ fail = TRUE;
+ break;
+
+ case BARRIER:
+ /* Succeed if the following insn is the target label.
+ Otherwise fail.
+ If return insns are used then the last insn in a function
+ will be a barrier. */
+ this_insn = next_nonnote_insn (this_insn);
+ if (this_insn && this_insn == label)
+ {
+ if (jump_clobbers)
+ {
+ arm_ccfsm_state = 2;
+ this_insn = next_nonnote_insn (this_insn);
+ }
+ else
+ arm_ccfsm_state = 1;
+ succeed = TRUE;
+ }
+ else
+ fail = TRUE;
+ break;
+
+ case CALL_INSN:
+ /* If using 32-bit addresses the cc is not preserved over
+ calls. */
+ if (TARGET_APCS_32)
+ {
+ /* Succeed if the following insn is the target label,
+ or if the following two insns are a barrier and
+ the target label. */
+ this_insn = next_nonnote_insn (this_insn);
+ if (this_insn && GET_CODE (this_insn) == BARRIER)
+ this_insn = next_nonnote_insn (this_insn);
+
+ if (this_insn && this_insn == label
+ && insns_skipped < max_insns_skipped)
+ {
+ if (jump_clobbers)
+ {
+ arm_ccfsm_state = 2;
+ this_insn = next_nonnote_insn (this_insn);
+ }
+ else
+ arm_ccfsm_state = 1;
+ succeed = TRUE;
+ }
+ else
+ fail = TRUE;
+ }
+ break;
+
+ case JUMP_INSN:
+ /* If this is an unconditional branch to the same label, succeed.
+ If it is to another label, do nothing. If it is conditional,
+ fail. */
+ /* XXX Probably, the tests for SET and the PC are unnecessary. */
+
+ scanbody = PATTERN (this_insn);
+ if (GET_CODE (scanbody) == SET
+ && GET_CODE (SET_DEST (scanbody)) == PC)
+ {
+ if (GET_CODE (SET_SRC (scanbody)) == LABEL_REF
+ && XEXP (SET_SRC (scanbody), 0) == label && !reverse)
+ {
+ arm_ccfsm_state = 2;
+ succeed = TRUE;
+ }
+ else if (GET_CODE (SET_SRC (scanbody)) == IF_THEN_ELSE)
+ fail = TRUE;
+ }
+ /* Fail if a conditional return is undesirable (eg on a
+ StrongARM), but still allow this if optimizing for size. */
+ else if (GET_CODE (scanbody) == RETURN
+ && ! use_return_insn (TRUE)
+ && ! optimize_size)
+ fail = TRUE;
+ else if (GET_CODE (scanbody) == RETURN
+ && seeking_return)
+ {
+ arm_ccfsm_state = 2;
+ succeed = TRUE;
+ }
+ else if (GET_CODE (scanbody) == PARALLEL)
+ {
+ switch (get_attr_conds (this_insn))
+ {
+ case CONDS_NOCOND:
+ break;
+ default:
+ fail = TRUE;
+ break;
+ }
+ }
+ break;
+
+ case INSN:
+ /* Instructions using or affecting the condition codes make it
+ fail. */
+ scanbody = PATTERN (this_insn);
+ if (! (GET_CODE (scanbody) == SET
+ || GET_CODE (scanbody) == PARALLEL)
+ || get_attr_conds (this_insn) != CONDS_NOCOND)
+ fail = TRUE;
+ break;
+
+ default:
+ break;
+ }
+ }
+ if (succeed)
+ {
+ if ((!seeking_return) && (arm_ccfsm_state == 1 || reverse))
+ arm_target_label = CODE_LABEL_NUMBER (label);
+ else if (seeking_return || arm_ccfsm_state == 2)
+ {
+ while (this_insn && GET_CODE (PATTERN (this_insn)) == USE)
+ {
+ this_insn = next_nonnote_insn (this_insn);
+ if (this_insn && (GET_CODE (this_insn) == BARRIER
+ || GET_CODE (this_insn) == CODE_LABEL))
+ abort ();
+ }
+ if (!this_insn)
+ {
+ /* Oh, dear! we ran off the end.. give up */
+ recog (PATTERN (insn), insn, NULL_PTR);
+ arm_ccfsm_state = 0;
+ arm_target_insn = NULL;
+ return;
+ }
+ arm_target_insn = this_insn;
+ }
+ else
+ abort ();
+ if (jump_clobbers)
+ {
+ if (reverse)
+ abort ();
+ arm_current_cc =
+ get_arm_condition_code (XEXP (XEXP (XEXP (SET_SRC (body),
+ 0), 0), 1));
+ if (GET_CODE (XEXP (XEXP (SET_SRC (body), 0), 0)) == AND)
+ arm_current_cc = ARM_INVERSE_CONDITION_CODE (arm_current_cc);
+ if (GET_CODE (XEXP (SET_SRC (body), 0)) == NE)
+ arm_current_cc = ARM_INVERSE_CONDITION_CODE (arm_current_cc);
+ }
+ else
+ {
+ /* If REVERSE is true, ARM_CURRENT_CC needs to be inverted from
+ what it was. */
+ if (!reverse)
+ arm_current_cc = get_arm_condition_code (XEXP (SET_SRC (body),
+ 0));
+ }
+
+ if (reverse || then_not_else)
+ arm_current_cc = ARM_INVERSE_CONDITION_CODE (arm_current_cc);
+ }
+
+ /* Restore recog_data (getting the attributes of other insns can
+ destroy this array, but final.c assumes that it remains intact
+ across this call; since the insn has been recognized already we
+ call recog direct). */
+ recog (PATTERN (insn), insn, NULL_PTR);
+ }
+}
+
+int
+arm_regno_class (regno)
+ int regno;
+{
+ if (TARGET_THUMB)
+ {
+ if (regno == STACK_POINTER_REGNUM)
+ return STACK_REG;
+ if (regno == CC_REGNUM)
+ return CC_REG;
+ if (regno < 8)
+ return LO_REGS;
+ return HI_REGS;
+ }
+
+ if ( regno <= LAST_ARM_REGNUM
+ || regno == FRAME_POINTER_REGNUM
+ || regno == ARG_POINTER_REGNUM)
+ return GENERAL_REGS;
+
+ if (regno == CC_REGNUM)
+ return NO_REGS;
+
+ return FPU_REGS;
+}
+
+/* Handle a special case when computing the offset
+ of an argument from the frame pointer. */
+int
+arm_debugger_arg_offset (value, addr)
+ int value;
+ rtx addr;
+{
+ rtx insn;
+
+ /* We are only interested if dbxout_parms() failed to compute the offset. */
+ if (value != 0)
+ return 0;
+
+ /* We can only cope with the case where the address is held in a register. */
+ if (GET_CODE (addr) != REG)
+ return 0;
+
+ /* If we are using the frame pointer to point at the argument, then
+ an offset of 0 is correct. */
+ if (REGNO (addr) == HARD_FRAME_POINTER_REGNUM)
+ return 0;
+
+ /* If we are using the stack pointer to point at the
+ argument, then an offset of 0 is correct. */
+ if ((TARGET_THUMB || ! frame_pointer_needed)
+ && REGNO (addr) == SP_REGNUM)
+ return 0;
+
+ /* Oh dear. The argument is pointed to by a register rather
+ than being held in a register, or being stored at a known
+ offset from the frame pointer. Since GDB only understands
+ those two kinds of argument we must translate the address
+ held in the register into an offset from the frame pointer.
+ We do this by searching through the insns for the function
+ looking to see where this register gets its value. If the
+ register is initialised from the frame pointer plus an offset
+ then we are in luck and we can continue, otherwise we give up.
+
+ This code is exercised by producing debugging information
+ for a function with arguments like this:
+
+ double func (double a, double b, int c, double d) {return d;}
+
+ Without this code the stab for parameter 'd' will be set to
+ an offset of 0 from the frame pointer, rather than 8. */
+
+ /* The if() statement says:
+
+ If the insn is a normal instruction
+ and if the insn is setting the value in a register
+ and if the register being set is the register holding the address of the argument
+ and if the address is computing by an addition
+ that involves adding to a register
+ which is the frame pointer
+ a constant integer
+
+ then... */
+
+ for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
+ {
+ if ( GET_CODE (insn) == INSN
+ && GET_CODE (PATTERN (insn)) == SET
+ && REGNO (XEXP (PATTERN (insn), 0)) == REGNO (addr)
+ && GET_CODE (XEXP (PATTERN (insn), 1)) == PLUS
+ && GET_CODE (XEXP (XEXP (PATTERN (insn), 1), 0)) == REG
+ && REGNO (XEXP (XEXP (PATTERN (insn), 1), 0)) == HARD_FRAME_POINTER_REGNUM
+ && GET_CODE (XEXP (XEXP (PATTERN (insn), 1), 1)) == CONST_INT
+ )
+ {
+ value = INTVAL (XEXP (XEXP (PATTERN (insn), 1), 1));
+
+ break;
+ }
+ }
+
+ if (value == 0)
+ {
+ debug_rtx (addr);
+ warning ("Unable to compute real location of stacked parameter");
+ value = 8; /* XXX magic hack */
+ }
+
+ return value;
+}
+
+\f
+/* Recursively search through all of the blocks in a function
+ checking to see if any of the variables created in that
+ function match the RTX called 'orig'. If they do then
+ replace them with the RTX called 'new'. */
+
+static void
+replace_symbols_in_block (block, orig, new)
+ tree block;
+ rtx orig;
+ rtx new;
+{
+ for (; block; block = BLOCK_CHAIN (block))
+ {
+ tree sym;
+
+ if (! TREE_USED (block))
+ continue;
+
+ for (sym = BLOCK_VARS (block); sym; sym = TREE_CHAIN (sym))
+ {
+ if ( (DECL_NAME (sym) == 0 && TREE_CODE (sym) != TYPE_DECL)
+ || DECL_IGNORED_P (sym)
+ || TREE_CODE (sym) != VAR_DECL
+ || DECL_EXTERNAL (sym)
+ || ! rtx_equal_p (DECL_RTL (sym), orig)
+ )
+ continue;
+
+ DECL_RTL (sym) = new;
+ }
+
+ replace_symbols_in_block (BLOCK_SUBBLOCKS (block), orig, new);
+ }
+}
+
+/* Return the number (counting from 0) of the least significant set
+ bit in MASK. */
+#ifdef __GNUC__
+inline
+#endif
+static int
+number_of_first_bit_set (mask)
+ int mask;
+{
+ int bit;
+
+ for (bit = 0;
+ (mask & (1 << bit)) == 0;
+ ++ bit)
+ continue;
+
+ return bit;
+}
+
+/* Generate code to return from a thumb function.
+ If 'reg_containing_return_addr' is -1, then the return address is
+ actually on the stack, at the stack pointer. */
+static void
+thumb_exit (f, reg_containing_return_addr, eh_ofs)
+ FILE * f;
+ int reg_containing_return_addr;
+ rtx eh_ofs;
+{
+ unsigned regs_available_for_popping;
+ unsigned regs_to_pop;
+ int pops_needed;
+ unsigned available;
+ unsigned required;
+ int mode;
+ int size;
+ int restore_a4 = FALSE;
+
+ /* Compute the registers we need to pop. */
+ regs_to_pop = 0;
+ pops_needed = 0;
+
+ /* There is an assumption here, that if eh_ofs is not NULL, the
+ normal return address will have been pushed. */
+ if (reg_containing_return_addr == -1 || eh_ofs)
+ {
+ /* When we are generating a return for __builtin_eh_return,
+ reg_containing_return_addr must specify the return regno. */
+ if (eh_ofs && reg_containing_return_addr == -1)
+ abort ();
+
+ regs_to_pop |= 1 << LR_REGNUM;
+ ++ pops_needed;
+ }
+
+ if (TARGET_BACKTRACE)
+ {
+ /* Restore the (ARM) frame pointer and stack pointer. */
+ regs_to_pop |= (1 << ARM_HARD_FRAME_POINTER_REGNUM) | (1 << SP_REGNUM);
+ pops_needed += 2;
+ }
+
+ /* If there is nothing to pop then just emit the BX instruction and
+ return. */
+ if (pops_needed == 0)
+ {
+ if (eh_ofs)
+ asm_fprintf (f, "\tadd\t%r, %r\n", SP_REGNUM, REGNO (eh_ofs));
+
+ asm_fprintf (f, "\tbx\t%r\n", reg_containing_return_addr);
+ return;
+ }
+ /* Otherwise if we are not supporting interworking and we have not created
+ a backtrace structure and the function was not entered in ARM mode then
+ just pop the return address straight into the PC. */
+ else if ( ! TARGET_INTERWORK
+ && ! TARGET_BACKTRACE
+ && ! is_called_in_ARM_mode (current_function_decl))
+ {
+ if (eh_ofs)
+ {
+ asm_fprintf (f, "\tadd\t%r, #4\n", SP_REGNUM);
+ asm_fprintf (f, "\tadd\t%r, %r\n", SP_REGNUM, REGNO (eh_ofs));
+ asm_fprintf (f, "\tbx\t%r\n", reg_containing_return_addr);
+ }
+ else
+ asm_fprintf (f, "\tpop\t{%r}\n", PC_REGNUM);
+
+ return;
+ }
+
+ /* Find out how many of the (return) argument registers we can corrupt. */
+ regs_available_for_popping = 0;
+
+ /* If returning via __builtin_eh_return, the bottom three registers
+ all contain information needed for the return. */
+ if (eh_ofs)
+ size = 12;
+ else
+ {
+#ifdef RTX_CODE
+ /* If we can deduce the registers used from the function's
+ return value. This is more reliable that examining
+ regs_ever_live[] because that will be set if the register is
+ ever used in the function, not just if the register is used
+ to hold a return value. */
+
+ if (current_function_return_rtx != 0)
+ mode = GET_MODE (current_function_return_rtx);
+ else
+#endif
+ mode = DECL_MODE (DECL_RESULT (current_function_decl));
+
+ size = GET_MODE_SIZE (mode);
+
+ if (size == 0)
+ {
+ /* In a void function we can use any argument register.
+ In a function that returns a structure on the stack
+ we can use the second and third argument registers. */
+ if (mode == VOIDmode)
+ regs_available_for_popping =
+ (1 << ARG_REGISTER (1))
+ | (1 << ARG_REGISTER (2))
+ | (1 << ARG_REGISTER (3));
+ else
+ regs_available_for_popping =
+ (1 << ARG_REGISTER (2))
+ | (1 << ARG_REGISTER (3));
+ }
+ else if (size <= 4)
+ regs_available_for_popping =
+ (1 << ARG_REGISTER (2))
+ | (1 << ARG_REGISTER (3));
+ else if (size <= 8)
+ regs_available_for_popping =
+ (1 << ARG_REGISTER (3));
+ }
+
+ /* Match registers to be popped with registers into which we pop them. */
+ for (available = regs_available_for_popping,
+ required = regs_to_pop;
+ required != 0 && available != 0;
+ available &= ~(available & - available),
+ required &= ~(required & - required))
+ -- pops_needed;
+
+ /* If we have any popping registers left over, remove them. */
+ if (available > 0)
+ regs_available_for_popping &= ~ available;
+
+ /* Otherwise if we need another popping register we can use
+ the fourth argument register. */
+ else if (pops_needed)
+ {
+ /* If we have not found any free argument registers and
+ reg a4 contains the return address, we must move it. */
+ if (regs_available_for_popping == 0
+ && reg_containing_return_addr == LAST_ARG_REGNUM)
+ {
+ asm_fprintf (f, "\tmov\t%r, %r\n", LR_REGNUM, LAST_ARG_REGNUM);
+ reg_containing_return_addr = LR_REGNUM;
+ }
+ else if (size > 12)
+ {
+ /* Register a4 is being used to hold part of the return value,
+ but we have dire need of a free, low register. */
+ restore_a4 = TRUE;
+
+ asm_fprintf (f, "\tmov\t%r, %r\n",IP_REGNUM, LAST_ARG_REGNUM);
+ }
+
+ if (reg_containing_return_addr != LAST_ARG_REGNUM)
+ {
+ /* The fourth argument register is available. */
+ regs_available_for_popping |= 1 << LAST_ARG_REGNUM;
+
+ -- pops_needed;
+ }
+ }
+
+ /* Pop as many registers as we can. */
+ thumb_pushpop (f, regs_available_for_popping, FALSE);
+
+ /* Process the registers we popped. */
+ if (reg_containing_return_addr == -1)
+ {
+ /* The return address was popped into the lowest numbered register. */
+ regs_to_pop &= ~ (1 << LR_REGNUM);
+
+ reg_containing_return_addr =
+ number_of_first_bit_set (regs_available_for_popping);
+
+ /* Remove this register for the mask of available registers, so that
+ the return address will not be corrupted by futher pops. */
+ regs_available_for_popping &= ~ (1 << reg_containing_return_addr);
+ }
+
+ /* If we popped other registers then handle them here. */
+ if (regs_available_for_popping)
+ {
+ int frame_pointer;
+
+ /* Work out which register currently contains the frame pointer. */
+ frame_pointer = number_of_first_bit_set (regs_available_for_popping);
+
+ /* Move it into the correct place. */
+ asm_fprintf (f, "\tmov\t%r, %r\n",
+ ARM_HARD_FRAME_POINTER_REGNUM, frame_pointer);
+
+ /* (Temporarily) remove it from the mask of popped registers. */
+ regs_available_for_popping &= ~ (1 << frame_pointer);
+ regs_to_pop &= ~ (1 << ARM_HARD_FRAME_POINTER_REGNUM);
+
+ if (regs_available_for_popping)
+ {
+ int stack_pointer;
+
+ /* We popped the stack pointer as well,
+ find the register that contains it. */
+ stack_pointer = number_of_first_bit_set (regs_available_for_popping);
+
+ /* Move it into the stack register. */
+ asm_fprintf (f, "\tmov\t%r, %r\n", SP_REGNUM, stack_pointer);
+
+ /* At this point we have popped all necessary registers, so
+ do not worry about restoring regs_available_for_popping
+ to its correct value:
+
+ assert (pops_needed == 0)
+ assert (regs_available_for_popping == (1 << frame_pointer))
+ assert (regs_to_pop == (1 << STACK_POINTER)) */
+ }
+ else
+ {
+ /* Since we have just move the popped value into the frame
+ pointer, the popping register is available for reuse, and
+ we know that we still have the stack pointer left to pop. */
+ regs_available_for_popping |= (1 << frame_pointer);
+ }
+ }
+
+ /* If we still have registers left on the stack, but we no longer have
+ any registers into which we can pop them, then we must move the return
+ address into the link register and make available the register that
+ contained it. */
+ if (regs_available_for_popping == 0 && pops_needed > 0)
+ {
+ regs_available_for_popping |= 1 << reg_containing_return_addr;
+
+ asm_fprintf (f, "\tmov\t%r, %r\n", LR_REGNUM,
+ reg_containing_return_addr);
+
+ reg_containing_return_addr = LR_REGNUM;
+ }
+
+ /* If we have registers left on the stack then pop some more.
+ We know that at most we will want to pop FP and SP. */
+ if (pops_needed > 0)
+ {
+ int popped_into;
+ int move_to;
+
+ thumb_pushpop (f, regs_available_for_popping, FALSE);
+
+ /* We have popped either FP or SP.
+ Move whichever one it is into the correct register. */
+ popped_into = number_of_first_bit_set (regs_available_for_popping);
+ move_to = number_of_first_bit_set (regs_to_pop);
+
+ asm_fprintf (f, "\tmov\t%r, %r\n", move_to, popped_into);
+
+ regs_to_pop &= ~ (1 << move_to);
+
+ -- pops_needed;
+ }
+
+ /* If we still have not popped everything then we must have only
+ had one register available to us and we are now popping the SP. */
+ if (pops_needed > 0)
+ {
+ int popped_into;
+
+ thumb_pushpop (f, regs_available_for_popping, FALSE);
+
+ popped_into = number_of_first_bit_set (regs_available_for_popping);
+
+ asm_fprintf (f, "\tmov\t%r, %r\n", SP_REGNUM, popped_into);
+ /*
+ assert (regs_to_pop == (1 << STACK_POINTER))
+ assert (pops_needed == 1)
+ */
+ }
+
+ /* If necessary restore the a4 register. */
+ if (restore_a4)
+ {
+ if (reg_containing_return_addr != LR_REGNUM)
+ {
+ asm_fprintf (f, "\tmov\t%r, %r\n", LR_REGNUM, LAST_ARG_REGNUM);
+ reg_containing_return_addr = LR_REGNUM;
+ }
+
+ asm_fprintf (f, "\tmov\t%r, %r\n", LAST_ARG_REGNUM, IP_REGNUM);
+ }
+
+ if (eh_ofs)
+ asm_fprintf (f, "\tadd\t%r, %r\n", SP_REGNUM, REGNO (eh_ofs));
+
+ /* Return to caller. */
+ asm_fprintf (f, "\tbx\t%r\n", reg_containing_return_addr);
+}
+
+/* Emit code to push or pop registers to or from the stack. */
+static void
+thumb_pushpop (f, mask, push)
+ FILE * f;
+ int mask;
+ int push;
+{
+ int regno;
+ int lo_mask = mask & 0xFF;
+
+ if (lo_mask == 0 && ! push && (mask & (1 << 15)))
+ {
+ /* Special case. Do not generate a POP PC statement here, do it in
+ thumb_exit() */
+ thumb_exit (f, -1, NULL_RTX);
+ return;
+ }
+
+ fprintf (f, "\t%s\t{", push ? "push" : "pop");
+
+ /* Look at the low registers first. */
+ for (regno = 0; regno <= LAST_LO_REGNUM; regno ++, lo_mask >>= 1)
+ {
+ if (lo_mask & 1)
+ {
+ asm_fprintf (f, "%r", regno);
+
+ if ((lo_mask & ~1) != 0)
+ fprintf (f, ", ");
+ }
+ }
+
+ if (push && (mask & (1 << LR_REGNUM)))
+ {
+ /* Catch pushing the LR. */
+ if (mask & 0xFF)
+ fprintf (f, ", ");
+
+ asm_fprintf (f, "%r", LR_REGNUM);
+ }
+ else if (!push && (mask & (1 << PC_REGNUM)))
+ {
+ /* Catch popping the PC. */
+ if (TARGET_INTERWORK || TARGET_BACKTRACE)
+ {
+ /* The PC is never poped directly, instead
+ it is popped into r3 and then BX is used. */
+ fprintf (f, "}\n");
+
+ thumb_exit (f, -1, NULL_RTX);
+
+ return;
+ }
+ else
+ {
+ if (mask & 0xFF)
+ fprintf (f, ", ");
+
+ asm_fprintf (f, "%r", PC_REGNUM);
+ }
+ }
+
+ fprintf (f, "}\n");
+}
+\f
+void
+thumb_final_prescan_insn (insn)
+ rtx insn;
+{
+ extern int * insn_addresses;
+
+ if (flag_print_asm_name)
+ asm_fprintf (asm_out_file, "%@ 0x%04x\n", insn_addresses[INSN_UID (insn)]);
+}
+
+int
+thumb_shiftable_const (val)
+ unsigned HOST_WIDE_INT val;
+{
+ unsigned HOST_WIDE_INT mask = 0xff;
+ int i;
+
+ if (val == 0) /* XXX */
+ return 0;
+
+ for (i = 0; i < 25; i++)
+ if ((val & (mask << i)) == val)
+ return 1;
+
+ return 0;
+}
+
+/* Returns non-zero if the current function contains,
+ or might contain a far jump. */
+int
+thumb_far_jump_used_p (int in_prologue)
+{
+ rtx insn;
+
+ /* This test is only important for leaf functions. */
+ /* assert (! leaf_function_p ()); */
+
+ /* If we have already decided that far jumps may be used,
+ do not bother checking again, and always return true even if
+ it turns out that they are not being used. Once we have made
+ the decision that far jumps are present (and that hence the link
+ register will be pushed onto the stack) we cannot go back on it. */
+ if (cfun->machine->far_jump_used)
+ return 1;
+
+ /* If this function is not being called from the prologue/epilogue
+ generation code then it must be being called from the
+ INITIAL_ELIMINATION_OFFSET macro. */
+ if (! in_prologue)
+ {
+ /* In this case we know that we are being asked about the elimination
+ of the arg pointer register. If that register is not being used,
+ then there are no arguments on the stack, and we do not have to
+ worry that a far jump might force the prologue to push the link
+ register, changing the stack offsets. In this case we can just
+ return false, since the presence of far jumps in the function will
+ not affect stack offsets.
+
+ If the arg pointer is live (or if it was live, but has now been
+ eliminated and so set to dead) then we do have to test to see if
+ the function might contain a far jump. This test can lead to some
+ false negatives, since before reload is completed, then length of
+ branch instructions is not known, so gcc defaults to returning their
+ longest length, which in turn sets the far jump attribute to true.
+
+ A false negative will not result in bad code being generated, but it
+ will result in a needless push and pop of the link register. We
+ hope that this does not occur too often. */
+ if (regs_ever_live [ARG_POINTER_REGNUM])
+ cfun->machine->arg_pointer_live = 1;
+ else if (! cfun->machine->arg_pointer_live)
+ return 0;
+ }
+
+ /* Check to see if the function contains a branch
+ insn with the far jump attribute set. */
+ for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
+ {
+ if (GET_CODE (insn) == JUMP_INSN
+ /* Ignore tablejump patterns. */
+ && GET_CODE (PATTERN (insn)) != ADDR_VEC
+ && GET_CODE (PATTERN (insn)) != ADDR_DIFF_VEC
+ && get_attr_far_jump (insn) == FAR_JUMP_YES
+ )
+ {
+ /* Record the fact that we have decied that
+ the function does use far jumps. */
+ cfun->machine->far_jump_used = 1;
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+/* Return non-zero if FUNC must be entered in ARM mode. */
+int
+is_called_in_ARM_mode (func)
+ tree func;
+{
+ if (TREE_CODE (func) != FUNCTION_DECL)
+ abort ();
+
+ /* Ignore the problem about functions whoes address is taken. */
+ if (TARGET_CALLEE_INTERWORKING && TREE_PUBLIC (func))
+ return TRUE;
+
+#ifdef ARM_PE
+ return lookup_attribute ("interfacearm", DECL_MACHINE_ATTRIBUTES (func)) != NULL_TREE;
+#else
+ return FALSE;
+#endif
+}
+
+/* The bits which aren't usefully expanded as rtl. */
+char *
+thumb_unexpanded_epilogue ()
+{
+ int regno;
+ int live_regs_mask = 0;
+ int high_regs_pushed = 0;
+ int leaf_function = leaf_function_p ();
+ int had_to_push_lr;
+ rtx eh_ofs = cfun->machine->eh_epilogue_sp_ofs;
+
+ if (return_used_this_function)
+ return "";
+
+ for (regno = 0; regno <= LAST_LO_REGNUM; regno++)
+ if (regs_ever_live[regno] && ! call_used_regs[regno]
+ && ! (TARGET_SINGLE_PIC_BASE && (regno == arm_pic_register)))
+ live_regs_mask |= 1 << regno;
+
+ for (regno = 8; regno < 13; regno++)
+ {
+ if (regs_ever_live[regno] && ! call_used_regs[regno]
+ && ! (TARGET_SINGLE_PIC_BASE && (regno == arm_pic_register)))
+ high_regs_pushed ++;
+ }
+
+ /* The prolog may have pushed some high registers to use as
+ work registers. eg the testuite file:
+ gcc/testsuite/gcc/gcc.c-torture/execute/complex-2.c
+ compiles to produce:
+ push {r4, r5, r6, r7, lr}
+ mov r7, r9
+ mov r6, r8
+ push {r6, r7}
+ as part of the prolog. We have to undo that pushing here. */
+
+ if (high_regs_pushed)
+ {
+ int mask = live_regs_mask;
+ int next_hi_reg;
+ int size;
+ int mode;
+
+#ifdef RTX_CODE
+ /* If we can deduce the registers used from the function's return value.
+ This is more reliable that examining regs_ever_live[] because that
+ will be set if the register is ever used in the function, not just if
+ the register is used to hold a return value. */
+
+ if (current_function_return_rtx != 0)
+ mode = GET_MODE (current_function_return_rtx);
+ else
+#endif
+ mode = DECL_MODE (DECL_RESULT (current_function_decl));
+
+ size = GET_MODE_SIZE (mode);
+
+ /* Unless we are returning a type of size > 12 register r3 is
+ available. */
+ if (size < 13)
+ mask |= 1 << 3;
+
+ if (mask == 0)
+ /* Oh dear! We have no low registers into which we can pop
+ high registers! */
+ fatal ("No low registers available for popping high registers");
+
+ for (next_hi_reg = 8; next_hi_reg < 13; next_hi_reg++)
+ if (regs_ever_live[next_hi_reg] && ! call_used_regs[next_hi_reg]
+ && ! (TARGET_SINGLE_PIC_BASE && (next_hi_reg == arm_pic_register)))
+ break;
+
+ while (high_regs_pushed)
+ {
+ /* Find lo register(s) into which the high register(s) can
+ be popped. */
+ for (regno = 0; regno <= LAST_LO_REGNUM; regno++)
{
- reverse = TRUE;
- seeking_return = 1;
+ if (mask & (1 << regno))
+ high_regs_pushed--;
+ if (high_regs_pushed == 0)
+ break;
}
- else
- return;
- }
+
+ mask &= (2 << regno) - 1; /* A noop if regno == 8 */
+
+ /* Pop the values into the low register(s). */
+ thumb_pushpop (asm_out_file, mask, 0);
+
+ /* Move the value(s) into the high registers. */
+ for (regno = 0; regno <= LAST_LO_REGNUM; regno++)
+ {
+ if (mask & (1 << regno))
+ {
+ asm_fprintf (asm_out_file, "\tmov\t%r, %r\n", next_hi_reg,
+ regno);
+
+ for (next_hi_reg++; next_hi_reg < 13; next_hi_reg++)
+ if (regs_ever_live[next_hi_reg] &&
+ ! call_used_regs[next_hi_reg]
+ && ! (TARGET_SINGLE_PIC_BASE
+ && (next_hi_reg == arm_pic_register)))
+ break;
+ }
+ }
+ }
+ }
+
+ had_to_push_lr = (live_regs_mask || ! leaf_function
+ || thumb_far_jump_used_p (1));
+
+ if (TARGET_BACKTRACE
+ && ((live_regs_mask & 0xFF) == 0)
+ && regs_ever_live [LAST_ARG_REGNUM] != 0)
+ {
+ /* The stack backtrace structure creation code had to
+ push R7 in order to get a work register, so we pop
+ it now. */
+ live_regs_mask |= (1 << LAST_LO_REGNUM);
+ }
+
+ if (current_function_pretend_args_size == 0 || TARGET_BACKTRACE)
+ {
+ if (had_to_push_lr
+ && ! is_called_in_ARM_mode (current_function_decl)
+ && ! eh_ofs)
+ live_regs_mask |= 1 << PC_REGNUM;
+
+ /* Either no argument registers were pushed or a backtrace
+ structure was created which includes an adjusted stack
+ pointer, so just pop everything. */
+ if (live_regs_mask)
+ thumb_pushpop (asm_out_file, live_regs_mask, FALSE);
+
+ if (eh_ofs)
+ thumb_exit (asm_out_file, 2, eh_ofs);
+ /* We have either just popped the return address into the
+ PC or it is was kept in LR for the entire function or
+ it is still on the stack because we do not want to
+ return by doing a pop {pc}. */
+ else if ((live_regs_mask & (1 << PC_REGNUM)) == 0)
+ thumb_exit (asm_out_file,
+ (had_to_push_lr
+ && is_called_in_ARM_mode (current_function_decl)) ?
+ -1 : LR_REGNUM, NULL_RTX);
+ }
+ else
+ {
+ /* Pop everything but the return address. */
+ live_regs_mask &= ~ (1 << PC_REGNUM);
+
+ if (live_regs_mask)
+ thumb_pushpop (asm_out_file, live_regs_mask, FALSE);
+
+ if (had_to_push_lr)
+ /* Get the return address into a temporary register. */
+ thumb_pushpop (asm_out_file, 1 << LAST_ARG_REGNUM, 0);
+
+ /* Remove the argument registers that were pushed onto the stack. */
+ asm_fprintf (asm_out_file, "\tadd\t%r, %r, #%d\n",
+ SP_REGNUM, SP_REGNUM,
+ current_function_pretend_args_size);
+
+ if (eh_ofs)
+ thumb_exit (asm_out_file, 2, eh_ofs);
else
- return;
+ thumb_exit (asm_out_file,
+ had_to_push_lr ? LAST_ARG_REGNUM : LR_REGNUM, NULL_RTX);
}
- if (arm_ccfsm_state != 0 && !reverse)
- abort ();
- if (GET_CODE (insn) != JUMP_INSN)
- return;
+ return "";
+}
- /* This jump might be paralleled with a clobber of the condition codes
- the jump should always come first */
- if (GET_CODE (body) == PARALLEL && XVECLEN (body, 0) > 0)
- body = XVECEXP (body, 0, 0);
+/* Functions to save and restore machine-specific function data. */
-#if 0
- /* If this is a conditional return then we don't want to know */
- if (GET_CODE (body) == SET && GET_CODE (SET_DEST (body)) == PC
- && GET_CODE (SET_SRC (body)) == IF_THEN_ELSE
- && (GET_CODE (XEXP (SET_SRC (body), 1)) == RETURN
- || GET_CODE (XEXP (SET_SRC (body), 2)) == RETURN))
- return;
-#endif
+static void
+arm_mark_machine_status (p)
+ struct function * p;
+{
+ struct machine_function *machine = p->machine;
- if (reverse
- || (GET_CODE (body) == SET && GET_CODE (SET_DEST (body)) == PC
- && GET_CODE (SET_SRC (body)) == IF_THEN_ELSE))
+ ggc_mark_rtx (machine->ra_rtx);
+ ggc_mark_rtx (machine->eh_epilogue_sp_ofs);
+}
+
+static void
+arm_init_machine_status (p)
+ struct function * p;
+{
+ p->machine =
+ (struct machine_function *) xcalloc (1, sizeof (struct machine_function));
+}
+
+/* Return an RTX indicating where the return address to the
+ calling function can be found. */
+rtx
+arm_return_addr (count, frame)
+ int count;
+ rtx frame ATTRIBUTE_UNUSED;
+{
+ rtx reg;
+
+ if (count != 0)
+ return NULL_RTX;
+
+ reg = cfun->machine->ra_rtx;
+
+ if (reg == NULL)
{
- int insns_skipped;
- int fail = FALSE, succeed = FALSE;
- /* Flag which part of the IF_THEN_ELSE is the LABEL_REF. */
- int then_not_else = TRUE;
- rtx this_insn = start_insn, label = 0;
+ rtx init;
+
+ /* No rtx yet. Invent one, and initialize it for r14 (lr) in
+ the prologue. */
+ reg = gen_reg_rtx (Pmode);
+ cfun->machine->ra_rtx = reg;
+
+ if (! TARGET_APCS_32)
+ init = gen_rtx_AND (Pmode, gen_rtx_REG (Pmode, LR_REGNUM),
+ GEN_INT (RETURN_ADDR_MASK26));
+ else
+ init = gen_rtx_REG (Pmode, LR_REGNUM);
- if (get_attr_conds (insn) == CONDS_JUMP_CLOB)
+ init = gen_rtx_SET (VOIDmode, reg, init);
+
+ /* Emit the insn to the prologue with the other argument copies. */
+ push_topmost_sequence ();
+ emit_insn_after (init, get_insns ());
+ pop_topmost_sequence ();
+ }
+
+ return reg;
+}
+
+/* Do anything needed before RTL is emitted for each function. */
+void
+arm_init_expanders ()
+{
+ /* Arrange to initialize and mark the machine per-function status. */
+ init_machine_status = arm_init_machine_status;
+ mark_machine_status = arm_mark_machine_status;
+}
+
+/* Generate the rest of a function's prologue. */
+void
+thumb_expand_prologue ()
+{
+ HOST_WIDE_INT amount = (get_frame_size ()
+ + current_function_outgoing_args_size);
+
+ /* Naked functions don't have prologues. */
+ if (arm_naked_function_p (current_function_decl))
+ return;
+
+ if (frame_pointer_needed)
+ emit_insn (gen_movsi (hard_frame_pointer_rtx, stack_pointer_rtx));
+
+ if (amount)
+ {
+ amount = ROUND_UP (amount);
+
+ if (amount < 512)
+ emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
+ GEN_INT (- amount)));
+ else
{
- /* The code below is wrong for these, and I haven't time to
- fix it now. So we just do the safe thing and return. This
- whole function needs re-writing anyway. */
- jump_clobbers = 1;
- return;
+ int regno;
+ rtx reg;
+
+ /* The stack decrement is too big for an immediate value in a single
+ insn. In theory we could issue multiple subtracts, but after
+ three of them it becomes more space efficient to place the full
+ value in the constant pool and load into a register. (Also the
+ ARM debugger really likes to see only one stack decrement per
+ function). So instead we look for a scratch register into which
+ we can load the decrement, and then we subtract this from the
+ stack pointer. Unfortunately on the thumb the only available
+ scratch registers are the argument registers, and we cannot use
+ these as they may hold arguments to the function. Instead we
+ attempt to locate a call preserved register which is used by this
+ function. If we can find one, then we know that it will have
+ been pushed at the start of the prologue and so we can corrupt
+ it now. */
+ for (regno = LAST_ARG_REGNUM + 1; regno <= LAST_LO_REGNUM; regno++)
+ if (regs_ever_live[regno]
+ && ! call_used_regs[regno] /* Paranoia */
+ && ! (TARGET_SINGLE_PIC_BASE && (regno == arm_pic_register))
+ && ! (frame_pointer_needed
+ && (regno == THUMB_HARD_FRAME_POINTER_REGNUM)))
+ break;
+
+ if (regno > LAST_LO_REGNUM) /* Very unlikely */
+ {
+ rtx spare = gen_rtx (REG, SImode, IP_REGNUM);
+
+ /* Choose an arbitary, non-argument low register. */
+ reg = gen_rtx (REG, SImode, LAST_LO_REGNUM);
+
+ /* Save it by copying it into a high, scratch register. */
+ emit_insn (gen_movsi (spare, reg));
+
+ /* Decrement the stack. */
+ emit_insn (gen_movsi (reg, GEN_INT (- amount)));
+ emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
+ reg));
+
+ /* Restore the low register's original value. */
+ emit_insn (gen_movsi (reg, spare));
+
+ /* Emit a USE of the restored scratch register, so that flow
+ analysis will not consider the restore redundant. The
+ register won't be used again in this function and isn't
+ restored by the epilogue. */
+ emit_insn (gen_rtx_USE (VOIDmode, reg));
+ }
+ else
+ {
+ reg = gen_rtx (REG, SImode, regno);
+
+ emit_insn (gen_movsi (reg, GEN_INT (- amount)));
+ emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
+ reg));
+ }
}
+ }
+
+ if (profile_flag || profile_block_flag || TARGET_NO_SCHED_PRO)
+ emit_insn (gen_blockage ());
+}
+
+void
+thumb_expand_epilogue ()
+{
+ HOST_WIDE_INT amount = (get_frame_size ()
+ + current_function_outgoing_args_size);
+
+ /* Naked functions don't have epilogues. */
+ if (arm_naked_function_p (current_function_decl))
+ return;
+
+ if (frame_pointer_needed)
+ emit_insn (gen_movsi (stack_pointer_rtx, hard_frame_pointer_rtx));
+ else if (amount)
+ {
+ amount = ROUND_UP (amount);
- /* Register the insn jumped to. */
- if (reverse)
- {
- if (!seeking_return)
- label = XEXP (SET_SRC (body), 0);
- }
- else if (GET_CODE (XEXP (SET_SRC (body), 1)) == LABEL_REF)
- label = XEXP (XEXP (SET_SRC (body), 1), 0);
- else if (GET_CODE (XEXP (SET_SRC (body), 2)) == LABEL_REF)
+ if (amount < 512)
+ emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
+ GEN_INT (amount)));
+ else
{
- label = XEXP (XEXP (SET_SRC (body), 2), 0);
- then_not_else = FALSE;
+ /* r3 is always free in the epilogue. */
+ rtx reg = gen_rtx (REG, SImode, LAST_ARG_REGNUM);
+
+ emit_insn (gen_movsi (reg, GEN_INT (amount)));
+ emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx, reg));
}
- else if (GET_CODE (XEXP (SET_SRC (body), 1)) == RETURN)
- seeking_return = 1;
- else if (GET_CODE (XEXP (SET_SRC (body), 2)) == RETURN)
- {
- seeking_return = 1;
- then_not_else = FALSE;
- }
- else
+ }
+
+ /* Emit a USE (stack_pointer_rtx), so that
+ the stack adjustment will not be deleted. */
+ emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
+
+ if (profile_flag || profile_block_flag || TARGET_NO_SCHED_PRO)
+ emit_insn (gen_blockage ());
+}
+
+void
+output_thumb_prologue (f)
+ FILE * f;
+{
+ int live_regs_mask = 0;
+ int high_regs_pushed = 0;
+ int store_arg_regs = 0;
+ int regno;
+
+ if (arm_naked_function_p (current_function_decl))
+ return;
+
+ if (is_called_in_ARM_mode (current_function_decl))
+ {
+ const char * name;
+
+ if (GET_CODE (DECL_RTL (current_function_decl)) != MEM)
+ abort ();
+ if (GET_CODE (XEXP (DECL_RTL (current_function_decl), 0)) != SYMBOL_REF)
abort ();
+ name = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);
+
+ /* Generate code sequence to switch us into Thumb mode. */
+ /* The .code 32 directive has already been emitted by
+ ASM_DECLARE_FUNCITON_NAME */
+ asm_fprintf (f, "\torr\t%r, %r, #1\n", IP_REGNUM, PC_REGNUM);
+ asm_fprintf (f, "\tbx\t%r\n", IP_REGNUM);
+
+ /* Generate a label, so that the debugger will notice the
+ change in instruction sets. This label is also used by
+ the assembler to bypass the ARM code when this function
+ is called from a Thumb encoded function elsewhere in the
+ same file. Hence the definition of STUB_NAME here must
+ agree with the definition in gas/config/tc-arm.c */
+
+#define STUB_NAME ".real_start_of"
+
+ asm_fprintf (f, "\t.code\t16\n");
+#ifdef ARM_PE
+ if (arm_dllexport_name_p (name))
+ name = arm_strip_name_encoding (name);
+#endif
+ asm_fprintf (f, "\t.globl %s%U%s\n", STUB_NAME, name);
+ asm_fprintf (f, "\t.thumb_func\n");
+ asm_fprintf (f, "%s%U%s:\n", STUB_NAME, name);
+ }
+
+ if (current_function_anonymous_args && current_function_pretend_args_size)
+ store_arg_regs = 1;
- /* See how many insns this branch skips, and what kind of insns. If all
- insns are okay, and the label or unconditional branch to the same
- label is not too far away, succeed. */
- for (insns_skipped = 0;
- !fail && !succeed && insns_skipped++ < MAX_INSNS_SKIPPED;)
+ if (current_function_pretend_args_size)
+ {
+ if (store_arg_regs)
{
- rtx scanbody;
+ int num_pushes;
+
+ asm_fprintf (f, "\tpush\t{");
- this_insn = next_nonnote_insn (this_insn);
- if (!this_insn)
- break;
+ num_pushes = NUM_INTS (current_function_pretend_args_size);
+
+ for (regno = LAST_ARG_REGNUM + 1 - num_pushes;
+ regno <= LAST_ARG_REGNUM;
+ regno ++)
+ asm_fprintf (f, "%r%s", regno,
+ regno == LAST_ARG_REGNUM ? "" : ", ");
- scanbody = PATTERN (this_insn);
+ asm_fprintf (f, "}\n");
+ }
+ else
+ asm_fprintf (f, "\tsub\t%r, %r, #%d\n",
+ SP_REGNUM, SP_REGNUM,
+ current_function_pretend_args_size);
+ }
- switch (GET_CODE (this_insn))
- {
- case CODE_LABEL:
- /* Succeed if it is the target label, otherwise fail since
- control falls in from somewhere else. */
- if (this_insn == label)
- {
- if (jump_clobbers)
- {
- arm_ccfsm_state = 2;
- this_insn = next_nonnote_insn (this_insn);
- }
- else
- arm_ccfsm_state = 1;
- succeed = TRUE;
- }
- else
- fail = TRUE;
- break;
+ for (regno = 0; regno <= LAST_LO_REGNUM; regno ++)
+ if (regs_ever_live[regno] && ! call_used_regs[regno]
+ && ! (TARGET_SINGLE_PIC_BASE && (regno == arm_pic_register)))
+ live_regs_mask |= 1 << regno;
- case BARRIER:
- /* Succeed if the following insn is the target label.
- Otherwise fail.
- If return insns are used then the last insn in a function
- will be a barrier. */
- this_insn = next_nonnote_insn (this_insn);
- if (this_insn && this_insn == label)
- {
- if (jump_clobbers)
- {
- arm_ccfsm_state = 2;
- this_insn = next_nonnote_insn (this_insn);
- }
- else
- arm_ccfsm_state = 1;
- succeed = TRUE;
- }
- else
- fail = TRUE;
+ if (live_regs_mask || ! leaf_function_p () || thumb_far_jump_used_p (1))
+ live_regs_mask |= 1 << LR_REGNUM;
+
+ if (TARGET_BACKTRACE)
+ {
+ int offset;
+ int work_register = 0;
+ int wr;
+
+ /* We have been asked to create a stack backtrace structure.
+ The code looks like this:
+
+ 0 .align 2
+ 0 func:
+ 0 sub SP, #16 Reserve space for 4 registers.
+ 2 push {R7} Get a work register.
+ 4 add R7, SP, #20 Get the stack pointer before the push.
+ 6 str R7, [SP, #8] Store the stack pointer (before reserving the space).
+ 8 mov R7, PC Get hold of the start of this code plus 12.
+ 10 str R7, [SP, #16] Store it.
+ 12 mov R7, FP Get hold of the current frame pointer.
+ 14 str R7, [SP, #4] Store it.
+ 16 mov R7, LR Get hold of the current return address.
+ 18 str R7, [SP, #12] Store it.
+ 20 add R7, SP, #16 Point at the start of the backtrace structure.
+ 22 mov FP, R7 Put this value into the frame pointer. */
+
+ if ((live_regs_mask & 0xFF) == 0)
+ {
+ /* See if the a4 register is free. */
+
+ if (regs_ever_live [LAST_ARG_REGNUM] == 0)
+ work_register = LAST_ARG_REGNUM;
+ else /* We must push a register of our own */
+ live_regs_mask |= (1 << LAST_LO_REGNUM);
+ }
+
+ if (work_register == 0)
+ {
+ /* Select a register from the list that will be pushed to
+ use as our work register. */
+ for (work_register = (LAST_LO_REGNUM + 1); work_register--;)
+ if ((1 << work_register) & live_regs_mask)
break;
+ }
+
+ asm_fprintf
+ (f, "\tsub\t%r, %r, #16\t%@ Create stack backtrace structure\n",
+ SP_REGNUM, SP_REGNUM);
+
+ if (live_regs_mask)
+ thumb_pushpop (f, live_regs_mask, 1);
+
+ for (offset = 0, wr = 1 << 15; wr != 0; wr >>= 1)
+ if (wr & live_regs_mask)
+ offset += 4;
+
+ asm_fprintf (f, "\tadd\t%r, %r, #%d\n", work_register, SP_REGNUM,
+ offset + 16 + current_function_pretend_args_size);
+
+ asm_fprintf (f, "\tstr\t%r, [%r, #%d]\n", work_register, SP_REGNUM,
+ offset + 4);
+
+ /* Make sure that the instruction fetching the PC is in the right place
+ to calculate "start of backtrace creation code + 12". */
+ if (live_regs_mask)
+ {
+ asm_fprintf (f, "\tmov\t%r, %r\n", work_register, PC_REGNUM);
+ asm_fprintf (f, "\tstr\t%r, [%r, #%d]\n", work_register, SP_REGNUM,
+ offset + 12);
+ asm_fprintf (f, "\tmov\t%r, %r\n", work_register,
+ ARM_HARD_FRAME_POINTER_REGNUM);
+ asm_fprintf (f, "\tstr\t%r, [%r, #%d]\n", work_register, SP_REGNUM,
+ offset);
+ }
+ else
+ {
+ asm_fprintf (f, "\tmov\t%r, %r\n", work_register,
+ ARM_HARD_FRAME_POINTER_REGNUM);
+ asm_fprintf (f, "\tstr\t%r, [%r, #%d]\n", work_register, SP_REGNUM,
+ offset);
+ asm_fprintf (f, "\tmov\t%r, %r\n", work_register, PC_REGNUM);
+ asm_fprintf (f, "\tstr\t%r, [%r, #%d]\n", work_register, SP_REGNUM,
+ offset + 12);
+ }
+
+ asm_fprintf (f, "\tmov\t%r, %r\n", work_register, LR_REGNUM);
+ asm_fprintf (f, "\tstr\t%r, [%r, #%d]\n", work_register, SP_REGNUM,
+ offset + 8);
+ asm_fprintf (f, "\tadd\t%r, %r, #%d\n", work_register, SP_REGNUM,
+ offset + 12);
+ asm_fprintf (f, "\tmov\t%r, %r\t\t%@ Backtrace structure created\n",
+ ARM_HARD_FRAME_POINTER_REGNUM, work_register);
+ }
+ else if (live_regs_mask)
+ thumb_pushpop (f, live_regs_mask, 1);
- case CALL_INSN:
- /* If using 32-bit addresses the cc is not preserved over
- calls */
- if (TARGET_APCS_32)
- {
- /* Succeed if the following insn is the target label,
- or if the following two insns are a barrier and
- the target label. */
- this_insn = next_nonnote_insn (this_insn);
- if (this_insn && GET_CODE (this_insn) == BARRIER)
- this_insn = next_nonnote_insn (this_insn);
+ for (regno = 8; regno < 13; regno++)
+ {
+ if (regs_ever_live[regno] && ! call_used_regs[regno]
+ && ! (TARGET_SINGLE_PIC_BASE && (regno == arm_pic_register)))
+ high_regs_pushed ++;
+ }
- if (this_insn && this_insn == label
- && insns_skipped < MAX_INSNS_SKIPPED)
- {
- if (jump_clobbers)
- {
- arm_ccfsm_state = 2;
- this_insn = next_nonnote_insn (this_insn);
- }
- else
- arm_ccfsm_state = 1;
- succeed = TRUE;
- }
- else
- fail = TRUE;
- }
- break;
+ if (high_regs_pushed)
+ {
+ int pushable_regs = 0;
+ int mask = live_regs_mask & 0xff;
+ int next_hi_reg;
- case JUMP_INSN:
- /* If this is an unconditional branch to the same label, succeed.
- If it is to another label, do nothing. If it is conditional,
- fail. */
- /* XXX Probably, the test for the SET and the PC are unnecessary. */
+ for (next_hi_reg = 12; next_hi_reg > LAST_LO_REGNUM; next_hi_reg--)
+ {
+ if (regs_ever_live[next_hi_reg] && ! call_used_regs[next_hi_reg]
+ && ! (TARGET_SINGLE_PIC_BASE
+ && (next_hi_reg == arm_pic_register)))
+ break;
+ }
- if (GET_CODE (scanbody) == SET
- && GET_CODE (SET_DEST (scanbody)) == PC)
+ pushable_regs = mask;
+
+ if (pushable_regs == 0)
+ {
+ /* Desperation time -- this probably will never happen. */
+ if (regs_ever_live[LAST_ARG_REGNUM]
+ || ! call_used_regs[LAST_ARG_REGNUM])
+ asm_fprintf (f, "\tmov\t%r, %r\n", IP_REGNUM, LAST_ARG_REGNUM);
+ mask = 1 << LAST_ARG_REGNUM;
+ }
+
+ while (high_regs_pushed > 0)
+ {
+ for (regno = LAST_LO_REGNUM; regno >= 0; regno--)
+ {
+ if (mask & (1 << regno))
{
- if (GET_CODE (SET_SRC (scanbody)) == LABEL_REF
- && XEXP (SET_SRC (scanbody), 0) == label && !reverse)
- {
- arm_ccfsm_state = 2;
- succeed = TRUE;
- }
- else if (GET_CODE (SET_SRC (scanbody)) == IF_THEN_ELSE)
- fail = TRUE;
- }
- else if (GET_CODE (scanbody) == RETURN
- && seeking_return)
- {
- arm_ccfsm_state = 2;
- succeed = TRUE;
- }
- else if (GET_CODE (scanbody) == PARALLEL)
- {
- switch (get_attr_conds (this_insn))
+ asm_fprintf (f, "\tmov\t%r, %r\n", regno, next_hi_reg);
+
+ high_regs_pushed --;
+
+ if (high_regs_pushed)
+ for (next_hi_reg--; next_hi_reg > LAST_LO_REGNUM;
+ next_hi_reg--)
+ {
+ if (regs_ever_live[next_hi_reg]
+ && ! call_used_regs[next_hi_reg]
+ && ! (TARGET_SINGLE_PIC_BASE
+ && (next_hi_reg == arm_pic_register)))
+ break;
+ }
+ else
{
- case CONDS_NOCOND:
- break;
- default:
- fail = TRUE;
+ mask &= ~ ((1 << regno) - 1);
break;
}
}
- break;
+ }
+
+ thumb_pushpop (f, mask, 1);
+ }
- case INSN:
- /* Instructions using or affecting the condition codes make it
- fail. */
- if ((GET_CODE (scanbody) == SET
- || GET_CODE (scanbody) == PARALLEL)
- && get_attr_conds (this_insn) != CONDS_NOCOND)
- fail = TRUE;
- break;
+ if (pushable_regs == 0
+ && (regs_ever_live[LAST_ARG_REGNUM]
+ || ! call_used_regs[LAST_ARG_REGNUM]))
+ asm_fprintf (f, "\tmov\t%r, %r\n", LAST_ARG_REGNUM, IP_REGNUM);
+ }
+}
- default:
- break;
- }
+/* Handle the case of a double word load into a low register from
+ a computed memory address. The computed address may involve a
+ register which is overwritten by the load. */
+
+char *
+thumb_load_double_from_address (operands)
+ rtx * operands;
+{
+ rtx addr;
+ rtx base;
+ rtx offset;
+ rtx arg1;
+ rtx arg2;
+
+ if (GET_CODE (operands[0]) != REG)
+ fatal ("thumb_load_double_from_address: destination is not a register");
+
+ if (GET_CODE (operands[1]) != MEM)
+ {
+ debug_rtx (operands[1]);
+ fatal ("thumb_load_double_from_address: source is not a computed memory address");
+ }
+
+ /* Get the memory address. */
+ addr = XEXP (operands[1], 0);
+
+ /* Work out how the memory address is computed. */
+ switch (GET_CODE (addr))
+ {
+ case REG:
+ operands[2] = gen_rtx (MEM, SImode,
+ plus_constant (XEXP (operands[1], 0), 4));
+
+ if (REGNO (operands[0]) == REGNO (addr))
+ {
+ output_asm_insn ("ldr\t%H0, %2", operands);
+ output_asm_insn ("ldr\t%0, %1", operands);
}
- if (succeed)
+ else
{
- if ((!seeking_return) && (arm_ccfsm_state == 1 || reverse))
- arm_target_label = CODE_LABEL_NUMBER (label);
- else if (seeking_return || arm_ccfsm_state == 2)
- {
- while (this_insn && GET_CODE (PATTERN (this_insn)) == USE)
- {
- this_insn = next_nonnote_insn (this_insn);
- if (this_insn && (GET_CODE (this_insn) == BARRIER
- || GET_CODE (this_insn) == CODE_LABEL))
- abort ();
- }
- if (!this_insn)
- {
- /* Oh, dear! we ran off the end.. give up */
- recog (PATTERN (insn), insn, NULL_PTR);
- arm_ccfsm_state = 0;
- arm_target_insn = NULL;
- return;
- }
- arm_target_insn = this_insn;
- }
- else
- abort ();
- if (jump_clobbers)
+ output_asm_insn ("ldr\t%0, %1", operands);
+ output_asm_insn ("ldr\t%H0, %2", operands);
+ }
+ break;
+
+ case CONST:
+ /* Compute <address> + 4 for the high order load. */
+ operands[2] = gen_rtx (MEM, SImode,
+ plus_constant (XEXP (operands[1], 0), 4));
+
+ output_asm_insn ("ldr\t%0, %1", operands);
+ output_asm_insn ("ldr\t%H0, %2", operands);
+ break;
+
+ case PLUS:
+ arg1 = XEXP (addr, 0);
+ arg2 = XEXP (addr, 1);
+
+ if (CONSTANT_P (arg1))
+ base = arg2, offset = arg1;
+ else
+ base = arg1, offset = arg2;
+
+ if (GET_CODE (base) != REG)
+ fatal ("thumb_load_double_from_address: base is not a register");
+
+ /* Catch the case of <address> = <reg> + <reg> */
+ if (GET_CODE (offset) == REG)
+ {
+ int reg_offset = REGNO (offset);
+ int reg_base = REGNO (base);
+ int reg_dest = REGNO (operands[0]);
+
+ /* Add the base and offset registers together into the
+ higher destination register. */
+ asm_fprintf (asm_out_file, "\tadd\t%r, %r, %r",
+ reg_dest + 1, reg_base, reg_offset);
+
+ /* Load the lower destination register from the address in
+ the higher destination register. */
+ asm_fprintf (asm_out_file, "\tldr\t%r, [%r, #0]",
+ reg_dest, reg_dest + 1);
+
+ /* Load the higher destination register from its own address
+ plus 4. */
+ asm_fprintf (asm_out_file, "\tldr\t%r, [%r, #4]",
+ reg_dest + 1, reg_dest + 1);
+ }
+ else
+ {
+ /* Compute <address> + 4 for the high order load. */
+ operands[2] = gen_rtx (MEM, SImode,
+ plus_constant (XEXP (operands[1], 0), 4));
+
+ /* If the computed address is held in the low order register
+ then load the high order register first, otherwise always
+ load the low order register first. */
+ if (REGNO (operands[0]) == REGNO (base))
{
- if (reverse)
- abort ();
- arm_current_cc =
- get_arm_condition_code (XEXP (XEXP (XEXP (SET_SRC (body),
- 0), 0), 1));
- if (GET_CODE (XEXP (XEXP (SET_SRC (body), 0), 0)) == AND)
- arm_current_cc = ARM_INVERSE_CONDITION_CODE (arm_current_cc);
- if (GET_CODE (XEXP (SET_SRC (body), 0)) == NE)
- arm_current_cc = ARM_INVERSE_CONDITION_CODE (arm_current_cc);
+ output_asm_insn ("ldr\t%H0, %2", operands);
+ output_asm_insn ("ldr\t%0, %1", operands);
}
else
{
- /* If REVERSE is true, ARM_CURRENT_CC needs to be inverted from
- what it was. */
- if (!reverse)
- arm_current_cc = get_arm_condition_code (XEXP (SET_SRC (body),
- 0));
+ output_asm_insn ("ldr\t%0, %1", operands);
+ output_asm_insn ("ldr\t%H0, %2", operands);
}
+ }
+ break;
- if (reverse || then_not_else)
- arm_current_cc = ARM_INVERSE_CONDITION_CODE (arm_current_cc);
+ case LABEL_REF:
+ /* With no registers to worry about we can just load the value
+ directly. */
+ operands[2] = gen_rtx (MEM, SImode,
+ plus_constant (XEXP (operands[1], 0), 4));
+
+ output_asm_insn ("ldr\t%H0, %2", operands);
+ output_asm_insn ("ldr\t%0, %1", operands);
+ break;
+
+ default:
+ debug_rtx (operands[1]);
+ fatal ("thumb_load_double_from_address: Unhandled address calculation");
+ break;
+ }
+
+ return "";
+}
+
+
+char *
+thumb_output_move_mem_multiple (n, operands)
+ int n;
+ rtx * operands;
+{
+ rtx tmp;
+
+ switch (n)
+ {
+ case 2:
+ if (REGNO (operands[2]) > REGNO (operands[3]))
+ {
+ tmp = operands[2];
+ operands[2] = operands[3];
+ operands[3] = tmp;
}
- /* restore recog_operand (getting the attributes of other insns can
- destroy this array, but final.c assumes that it remains intact
- across this call; since the insn has been recognized already we
- call recog direct). */
- recog (PATTERN (insn), insn, NULL_PTR);
+ output_asm_insn ("ldmia\t%1!, {%2, %3}", operands);
+ output_asm_insn ("stmia\t%0!, {%2, %3}", operands);
+ break;
+
+ case 3:
+ if (REGNO (operands[2]) > REGNO (operands[3]))
+ {
+ tmp = operands[2];
+ operands[2] = operands[3];
+ operands[3] = tmp;
+ }
+ if (REGNO (operands[3]) > REGNO (operands[4]))
+ {
+ tmp = operands[3];
+ operands[3] = operands[4];
+ operands[4] = tmp;
+ }
+ if (REGNO (operands[2]) > REGNO (operands[3]))
+ {
+ tmp = operands[2];
+ operands[2] = operands[3];
+ operands[3] = tmp;
+ }
+
+ output_asm_insn ("ldmia\t%1!, {%2, %3, %4}", operands);
+ output_asm_insn ("stmia\t%0!, {%2, %3, %4}", operands);
+ break;
+
+ default:
+ abort ();
+ }
+
+ return "";
+}
+
+/* Routines for generating rtl */
+
+void
+thumb_expand_movstrqi (operands)
+ rtx * operands;
+{
+ rtx out = copy_to_mode_reg (SImode, XEXP (operands[0], 0));
+ rtx in = copy_to_mode_reg (SImode, XEXP (operands[1], 0));
+ HOST_WIDE_INT len = INTVAL (operands[2]);
+ HOST_WIDE_INT offset = 0;
+
+ while (len >= 12)
+ {
+ emit_insn (gen_movmem12b (out, in));
+ len -= 12;
+ }
+
+ if (len >= 8)
+ {
+ emit_insn (gen_movmem8b (out, in));
+ len -= 8;
+ }
+
+ if (len >= 4)
+ {
+ rtx reg = gen_reg_rtx (SImode);
+ emit_insn (gen_movsi (reg, gen_rtx (MEM, SImode, in)));
+ emit_insn (gen_movsi (gen_rtx (MEM, SImode, out), reg));
+ len -= 4;
+ offset += 4;
+ }
+
+ if (len >= 2)
+ {
+ rtx reg = gen_reg_rtx (HImode);
+ emit_insn (gen_movhi (reg, gen_rtx (MEM, HImode,
+ plus_constant (in, offset))));
+ emit_insn (gen_movhi (gen_rtx (MEM, HImode, plus_constant (out, offset)),
+ reg));
+ len -= 2;
+ offset += 2;
+ }
+
+ if (len)
+ {
+ rtx reg = gen_reg_rtx (QImode);
+ emit_insn (gen_movqi (reg, gen_rtx (MEM, QImode,
+ plus_constant (in, offset))));
+ emit_insn (gen_movqi (gen_rtx (MEM, QImode, plus_constant (out, offset)),
+ reg));
+ }
+}
+
+int
+thumb_cmp_operand (op, mode)
+ rtx op;
+ enum machine_mode mode;
+{
+ return ((GET_CODE (op) == CONST_INT
+ && (unsigned HOST_WIDE_INT) (INTVAL (op)) < 256)
+ || register_operand (op, mode));
+}
+
+static char *
+thumb_condition_code (x, invert)
+ rtx x;
+ int invert;
+{
+ static char * conds[] =
+ {
+ "eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc",
+ "hi", "ls", "ge", "lt", "gt", "le"
+ };
+ int val;
+
+ switch (GET_CODE (x))
+ {
+ case EQ: val = 0; break;
+ case NE: val = 1; break;
+ case GEU: val = 2; break;
+ case LTU: val = 3; break;
+ case GTU: val = 8; break;
+ case LEU: val = 9; break;
+ case GE: val = 10; break;
+ case LT: val = 11; break;
+ case GT: val = 12; break;
+ case LE: val = 13; break;
+ default:
+ abort ();
+ }
+
+ return conds[val ^ invert];
+}
+
+/* Handle storing a half-word to memory during reload. */
+void
+thumb_reload_out_hi (operands)
+ rtx * operands;
+{
+ emit_insn (gen_thumb_movhi_clobber (operands[0], operands[1], operands[2]));
+}
+
+/* Handle storing a half-word to memory during reload. */
+void
+thumb_reload_in_hi (operands)
+ rtx * operands ATTRIBUTE_UNUSED;
+{
+ abort ();
+}
+
+/* Return the length of a function name prefix
+ that starts with the character 'c'. */
+static int
+arm_get_strip_length (char c)
+{
+ switch (c)
+ {
+ ARM_NAME_ENCODING_LENGTHS
+ default: return 0;
}
}
+/* Return a pointer to a function's name with any
+ and all prefix encodings stripped from it. */
+const char *
+arm_strip_name_encoding (const char * name)
+{
+ int skip;
+
+ while ((skip = arm_get_strip_length (* name)))
+ name += skip;
+
+ return name;
+}
+
#ifdef AOF_ASSEMBLER
-/* Special functions only needed when producing AOF syntax assembler. */
+/* Special functions only needed when producing AOF syntax assembler. */
rtx aof_pic_label = NULL_RTX;
struct pic_chain
{
- struct pic_chain *next;
- char *symname;
+ struct pic_chain * next;
+ char * symname;
};
-static struct pic_chain *aof_pic_chain = NULL;
+static struct pic_chain * aof_pic_chain = NULL;
rtx
aof_pic_entry (x)
rtx x;
{
- struct pic_chain **chainp;
+ struct pic_chain ** chainp;
int offset;
if (aof_pic_label == NULL_RTX)
{
+ /* We mark this here and not in arm_add_gc_roots() to avoid
+ polluting even more code with ifdefs, and because it never
+ contains anything useful until we assign to it here. */
+ ggc_add_rtx_root (& aof_pic_label, 1);
/* This needs to persist throughout the compilation. */
end_temporary_allocation ();
- aof_pic_label = gen_rtx (SYMBOL_REF, Pmode, "x$adcons");
+ aof_pic_label = gen_rtx_SYMBOL_REF (Pmode, "x$adcons");
resume_temporary_allocation ();
}
void
aof_dump_pic_table (f)
- FILE *f;
+ FILE * f;
{
- struct pic_chain *chain;
+ struct pic_chain * chain;
if (aof_pic_chain == NULL)
return;
- fprintf (f, "\tAREA |%s$$adcons|, BASED %s%s\n",
- reg_names[PIC_OFFSET_TABLE_REGNUM], REGISTER_PREFIX,
- reg_names[PIC_OFFSET_TABLE_REGNUM]);
+ asm_fprintf (f, "\tAREA |%r$$adcons|, BASED %r\n",
+ PIC_OFFSET_TABLE_REGNUM,
+ PIC_OFFSET_TABLE_REGNUM);
fputs ("|x$adcons|\n", f);
for (chain = aof_pic_chain; chain; chain = chain->next)
/* The AOF assembler is religiously strict about declarations of
imported and exported symbols, so that it is impossible to declare
- a function as imported near the begining of the file, and then to
+ a function as imported near the beginning of the file, and then to
export it later on. It is, however, possible to delay the decision
until all the functions in the file have been compiled. To get
around this, we maintain a list of the imports and exports, and
struct import
{
- struct import *next;
- char *name;
+ struct import * next;
+ char * name;
};
-static struct import *imports_list = NULL;
+static struct import * imports_list = NULL;
void
aof_add_import (name)
- char *name;
+ char * name;
{
- struct import *new;
+ struct import * new;
for (new = imports_list; new; new = new->next)
if (new->name == name)
void
aof_delete_import (name)
- char *name;
+ char * name;
{
- struct import **old;
+ struct import ** old;
for (old = &imports_list; *old; old = & (*old)->next)
{
void
aof_dump_imports (f)
- FILE *f;
+ FILE * f;
{
/* The AOF assembler needs this to cause the startup code to be extracted
from the library. Brining in __main causes the whole thing to work
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