1 /* Output routines for GCC for CRX.
2 Copyright (C) 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
3 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published
9 by the Free Software Foundation; either version 3, or (at your
10 option) any later version.
12 GCC is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
21 /*****************************************************************************/
23 /*****************************************************************************/
27 #include "coretypes.h"
33 #include "hard-reg-set.h"
35 #include "insn-config.h"
36 #include "conditions.h"
38 #include "insn-codes.h"
39 #include "insn-attr.h"
47 #include "basic-block.h"
49 #include "target-def.h"
51 /*****************************************************************************/
53 /*****************************************************************************/
55 /* Maximum number of register used for passing parameters. */
56 #define MAX_REG_FOR_PASSING_ARGS 6
58 /* Minimum number register used for passing parameters. */
59 #define MIN_REG_FOR_PASSING_ARGS 2
61 /* The maximum count of words supported in the assembly of the architecture in
62 * a push/pop instruction. */
65 /* Predicate is true if the current function is a 'noreturn' function, i.e. it
66 * is qualified as volatile. */
67 #define FUNC_IS_NORETURN_P(decl) (TREE_THIS_VOLATILE (decl))
69 /* The following macros are used in crx_decompose_address () */
71 /* Returns the factor of a scaled index address or -1 if invalid. */
72 #define SCALE_FOR_INDEX_P(X) \
73 (GET_CODE (X) == CONST_INT ? \
74 (INTVAL (X) == 1 ? 1 : \
75 INTVAL (X) == 2 ? 2 : \
76 INTVAL (X) == 4 ? 4 : \
77 INTVAL (X) == 8 ? 8 : \
81 /* Nonzero if the rtx X is a signed const int of n bits */
82 #define RTX_SIGNED_INT_FITS_N_BITS(X,n) \
83 ((GET_CODE (X) == CONST_INT \
84 && SIGNED_INT_FITS_N_BITS (INTVAL (X), n)) ? 1 : 0)
86 /* Nonzero if the rtx X is an unsigned const int of n bits. */
87 #define RTX_UNSIGNED_INT_FITS_N_BITS(X, n) \
88 ((GET_CODE (X) == CONST_INT \
89 && UNSIGNED_INT_FITS_N_BITS (INTVAL (X), n)) ? 1 : 0)
91 /*****************************************************************************/
92 /* STATIC VARIABLES */
93 /*****************************************************************************/
95 /* Nonzero if the last param processed is passed in a register. */
96 static int last_parm_in_reg;
98 /* Will hold the number of the last register the prologue saves, -1 if no
99 * register is saved. */
100 static int last_reg_to_save;
102 /* Each object in the array is a register number. Mark 1 for registers that
103 * need to be saved. */
104 static int save_regs[FIRST_PSEUDO_REGISTER];
106 /* Number of bytes saved on the stack for non-scratch registers */
107 static int sum_regs = 0;
109 /* Number of bytes saved on the stack for local variables. */
110 static int local_vars_size;
112 /* The sum of 2 sizes: locals vars and padding byte for saving the registers.
113 * Used in expand_prologue () and expand_epilogue (). */
114 static int size_for_adjusting_sp;
116 /* In case of a POST_INC or POST_DEC memory reference, we must report the mode
117 * of the memory reference from PRINT_OPERAND to PRINT_OPERAND_ADDRESS. */
118 static enum machine_mode output_memory_reference_mode;
120 /*****************************************************************************/
121 /* GLOBAL VARIABLES */
122 /*****************************************************************************/
124 /* Table of machine attributes. */
125 const struct attribute_spec crx_attribute_table[];
127 /*****************************************************************************/
128 /* TARGETM FUNCTION PROTOTYPES */
129 /*****************************************************************************/
131 static bool crx_fixed_condition_code_regs (unsigned int *, unsigned int *);
132 static rtx crx_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED,
133 int incoming ATTRIBUTE_UNUSED);
134 static bool crx_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED);
135 static int crx_address_cost (rtx, bool);
137 /*****************************************************************************/
138 /* STACK LAYOUT AND CALLING CONVENTIONS */
139 /*****************************************************************************/
141 #undef TARGET_FIXED_CONDITION_CODE_REGS
142 #define TARGET_FIXED_CONDITION_CODE_REGS crx_fixed_condition_code_regs
144 #undef TARGET_STRUCT_VALUE_RTX
145 #define TARGET_STRUCT_VALUE_RTX crx_struct_value_rtx
147 #undef TARGET_RETURN_IN_MEMORY
148 #define TARGET_RETURN_IN_MEMORY crx_return_in_memory
150 /*****************************************************************************/
151 /* RELATIVE COSTS OF OPERATIONS */
152 /*****************************************************************************/
154 #undef TARGET_ADDRESS_COST
155 #define TARGET_ADDRESS_COST crx_address_cost
157 /*****************************************************************************/
158 /* TARGET-SPECIFIC USES OF `__attribute__' */
159 /*****************************************************************************/
161 #undef TARGET_ATTRIBUTE_TABLE
162 #define TARGET_ATTRIBUTE_TABLE crx_attribute_table
164 const struct attribute_spec crx_attribute_table[] = {
165 /* ISRs have special prologue and epilogue requirements. */
166 {"interrupt", 0, 0, false, true, true, NULL},
167 {NULL, 0, 0, false, false, false, NULL}
171 /* Initialize 'targetm' variable which contains pointers to functions and data
172 * relating to the target machine. */
174 struct gcc_target targetm = TARGET_INITIALIZER;
177 /*****************************************************************************/
178 /* TARGET HOOK IMPLEMENTATIONS */
179 /*****************************************************************************/
181 /* Return the fixed registers used for condition codes. */
184 crx_fixed_condition_code_regs (unsigned int *p1, unsigned int *p2)
187 *p2 = INVALID_REGNUM;
191 /* Implements hook TARGET_STRUCT_VALUE_RTX. */
194 crx_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED,
195 int incoming ATTRIBUTE_UNUSED)
197 return gen_rtx_REG (Pmode, CRX_STRUCT_VALUE_REGNUM);
200 /* Implements hook TARGET_RETURN_IN_MEMORY. */
203 crx_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED)
205 if (TYPE_MODE (type) == BLKmode)
207 HOST_WIDE_INT size = int_size_in_bytes (type);
208 return (size == -1 || size > 8);
215 /*****************************************************************************/
216 /* MACRO IMPLEMENTATIONS */
217 /*****************************************************************************/
219 /* STACK LAYOUT AND CALLING CONVENTIONS ROUTINES */
220 /* --------------------------------------------- */
222 /* Return nonzero if the current function being compiled is an interrupt
223 * function as specified by the "interrupt" attribute. */
226 crx_interrupt_function_p (void)
230 attributes = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
231 return lookup_attribute ("interrupt", attributes) != NULL_TREE;
234 /* Compute values for the array save_regs and the variable sum_regs. The index
235 * of save_regs is numbers of register, each will get 1 if we need to save it
236 * in the current function, 0 if not. sum_regs is the total sum of the
237 * registers being saved. */
240 crx_compute_save_regs (void)
244 /* initialize here so in case the function is no-return it will be -1. */
245 last_reg_to_save = -1;
247 /* No need to save any registers if the function never returns. */
248 if (FUNC_IS_NORETURN_P (current_function_decl))
251 /* Initialize the number of bytes to be saved. */
254 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
256 if (fixed_regs[regno])
258 save_regs[regno] = 0;
262 /* If this reg is used and not call-used (except RA), save it. */
263 if (crx_interrupt_function_p ())
265 if (!current_function_is_leaf && call_used_regs[regno])
266 /* this is a volatile reg in a non-leaf interrupt routine - save it
267 * for the sake of its sons. */
268 save_regs[regno] = 1;
270 else if (df_regs_ever_live_p (regno))
271 /* This reg is used - save it. */
272 save_regs[regno] = 1;
274 /* This reg is not used, and is not a volatile - don't save. */
275 save_regs[regno] = 0;
279 /* If this reg is used and not call-used (except RA), save it. */
280 if (df_regs_ever_live_p (regno)
281 && (!call_used_regs[regno] || regno == RETURN_ADDRESS_REGNUM))
282 save_regs[regno] = 1;
284 save_regs[regno] = 0;
288 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
289 if (save_regs[regno] == 1)
291 last_reg_to_save = regno;
292 sum_regs += UNITS_PER_WORD;
296 /* Compute the size of the local area and the size to be adjusted by the
297 * prologue and epilogue. */
300 crx_compute_frame (void)
302 /* For aligning the local variables. */
303 int stack_alignment = STACK_BOUNDARY / BITS_PER_UNIT;
306 /* Padding needed for each element of the frame. */
307 local_vars_size = get_frame_size ();
309 /* Align to the stack alignment. */
310 padding_locals = local_vars_size % stack_alignment;
312 padding_locals = stack_alignment - padding_locals;
314 local_vars_size += padding_locals;
316 size_for_adjusting_sp = local_vars_size + (ACCUMULATE_OUTGOING_ARGS ?
317 crtl->outgoing_args_size : 0);
320 /* Implements the macro INITIAL_ELIMINATION_OFFSET, return the OFFSET. */
323 crx_initial_elimination_offset (int from, int to)
325 /* Compute this since we need to use sum_regs. */
326 crx_compute_save_regs ();
328 /* Compute this since we need to use local_vars_size. */
329 crx_compute_frame ();
331 if ((from) == FRAME_POINTER_REGNUM && (to) == STACK_POINTER_REGNUM)
332 return (ACCUMULATE_OUTGOING_ARGS ?
333 crtl->outgoing_args_size : 0);
334 else if ((from) == ARG_POINTER_REGNUM && (to) == FRAME_POINTER_REGNUM)
335 return (sum_regs + local_vars_size);
336 else if ((from) == ARG_POINTER_REGNUM && (to) == STACK_POINTER_REGNUM)
337 return (sum_regs + local_vars_size +
338 (ACCUMULATE_OUTGOING_ARGS ?
339 crtl->outgoing_args_size : 0));
347 /* Return the class number of the smallest class containing reg number REGNO.
348 * This could be a conditional expression or could index an array. */
351 crx_regno_reg_class (int regno)
353 if (regno >= 0 && regno < SP_REGNUM)
356 if (regno == SP_REGNUM)
359 if (regno == LO_REGNUM)
361 if (regno == HI_REGNUM)
367 /* Transfer between HILO_REGS and memory via secondary reloading. */
370 crx_secondary_reload_class (enum reg_class rclass,
371 enum machine_mode mode ATTRIBUTE_UNUSED,
372 rtx x ATTRIBUTE_UNUSED)
374 if (reg_classes_intersect_p (rclass, HILO_REGS)
375 && true_regnum (x) == -1)
381 /* Return 1 if hard register REGNO can hold a value of machine-mode MODE. */
384 crx_hard_regno_mode_ok (int regno, enum machine_mode mode)
386 /* CC can only hold CCmode values. */
387 if (regno == CC_REGNUM)
388 return GET_MODE_CLASS (mode) == MODE_CC;
389 if (GET_MODE_CLASS (mode) == MODE_CC)
391 /* HILO registers can only hold SImode and DImode */
392 if (HILO_REGNO_P (regno))
393 return mode == SImode || mode == DImode;
397 /* PASSING FUNCTION ARGUMENTS */
398 /* -------------------------- */
400 /* If enough param regs are available for passing the param of type TYPE return
401 * the number of registers needed else 0. */
404 enough_regs_for_param (CUMULATIVE_ARGS * cum, tree type,
405 enum machine_mode mode)
411 type_size = GET_MODE_BITSIZE (mode);
413 type_size = int_size_in_bytes (type) * BITS_PER_UNIT;
416 BITS_PER_WORD * (MAX_REG_FOR_PASSING_ARGS -
417 (MIN_REG_FOR_PASSING_ARGS + cum->ints) + 1);
419 /* Any variable which is too big to pass in two registers, will pass on
421 if ((remaining_size >= type_size) && (type_size <= 2 * BITS_PER_WORD))
422 return (type_size + BITS_PER_WORD - 1) / BITS_PER_WORD;
427 /* Implements the macro FUNCTION_ARG defined in crx.h. */
430 crx_function_arg (CUMULATIVE_ARGS * cum, enum machine_mode mode, tree type,
431 int named ATTRIBUTE_UNUSED)
433 last_parm_in_reg = 0;
435 /* Function_arg () is called with this type just after all the args have had
436 * their registers assigned. The rtx that function_arg returns from this type
437 * is supposed to pass to 'gen_call' but currently it is not implemented (see
438 * macro GEN_CALL). */
439 if (type == void_type_node)
442 if (targetm.calls.must_pass_in_stack (mode, type) || (cum->ints < 0))
447 /* Enable structures that need padding bytes at the end to pass to a
448 * function in registers. */
449 if (enough_regs_for_param (cum, type, mode) != 0)
451 last_parm_in_reg = 1;
452 return gen_rtx_REG (mode, MIN_REG_FOR_PASSING_ARGS + cum->ints);
456 if (MIN_REG_FOR_PASSING_ARGS + cum->ints > MAX_REG_FOR_PASSING_ARGS)
460 if (enough_regs_for_param (cum, type, mode) != 0)
462 last_parm_in_reg = 1;
463 return gen_rtx_REG (mode, MIN_REG_FOR_PASSING_ARGS + cum->ints);
470 /* Implements the macro INIT_CUMULATIVE_ARGS defined in crx.h. */
473 crx_init_cumulative_args (CUMULATIVE_ARGS * cum, tree fntype,
474 rtx libfunc ATTRIBUTE_UNUSED)
476 tree param, next_param;
480 /* Determine if this function has variable arguments. This is indicated by
481 * the last argument being 'void_type_mode' if there are no variable
482 * arguments. Change here for a different vararg. */
483 for (param = (fntype) ? TYPE_ARG_TYPES (fntype) : 0;
484 param != (tree) 0; param = next_param)
486 next_param = TREE_CHAIN (param);
487 if (next_param == (tree) 0 && TREE_VALUE (param) != void_type_node)
495 /* Implements the macro FUNCTION_ARG_ADVANCE defined in crx.h. */
498 crx_function_arg_advance (CUMULATIVE_ARGS * cum, enum machine_mode mode,
499 tree type, int named ATTRIBUTE_UNUSED)
501 /* l holds the number of registers required */
502 int l = GET_MODE_BITSIZE (mode) / BITS_PER_WORD;
504 /* If the parameter isn't passed on a register don't advance cum. */
505 if (!last_parm_in_reg)
508 if (targetm.calls.must_pass_in_stack (mode, type) || (cum->ints < 0))
511 if (mode == SImode || mode == HImode || mode == QImode || mode == DImode)
518 else if (mode == SFmode || mode == DFmode)
520 else if ((mode) == BLKmode)
522 if ((l = enough_regs_for_param (cum, type, mode)) != 0)
528 /* Implements the macro FUNCTION_ARG_REGNO_P defined in crx.h. Return nonzero
529 * if N is a register used for passing parameters. */
532 crx_function_arg_regno_p (int n)
534 return (n <= MAX_REG_FOR_PASSING_ARGS && n >= MIN_REG_FOR_PASSING_ARGS);
537 /* ADDRESSING MODES */
538 /* ---------------- */
540 /* Implements the macro GO_IF_LEGITIMATE_ADDRESS defined in crx.h.
541 * The following addressing modes are supported on CRX:
543 * Relocations --> const | symbol_ref | label_ref
544 * Absolute address --> 32-bit absolute
545 * Post increment --> reg + 12-bit disp.
546 * Post modify --> reg + 12-bit disp.
547 * Register relative --> reg | 32-bit disp. + reg | 4 bit + reg
548 * Scaled index --> reg + reg | 22-bit disp. + reg + reg |
549 * 22-disp. + reg + reg + (2 | 4 | 8) */
551 static int crx_addr_reg_p (rtx addr_reg)
555 if (REG_P (addr_reg))
559 else if ((GET_CODE (addr_reg) == SUBREG
560 && REG_P (SUBREG_REG (addr_reg))
561 && GET_MODE_SIZE (GET_MODE (SUBREG_REG (addr_reg)))
564 reg = SUBREG_REG (addr_reg);
569 if (GET_MODE (addr_reg) != Pmode)
578 crx_decompose_address (rtx addr, struct crx_address *out)
580 rtx base = NULL_RTX, index = NULL_RTX, disp = NULL_RTX;
581 rtx scale_rtx = NULL_RTX, side_effect = NULL_RTX;
584 enum crx_addrtype retval = CRX_INVALID;
586 switch (GET_CODE (addr))
589 /* Absolute address (known at compile time) */
590 retval = CRX_ABSOLUTE;
592 if (!UNSIGNED_INT_FITS_N_BITS (INTVAL (disp), GET_MODE_BITSIZE (Pmode)))
599 /* Absolute address (known at link time) */
600 retval = CRX_ABSOLUTE;
606 /* Register relative address */
607 retval = CRX_REG_REL;
612 switch (GET_CODE (XEXP (addr, 0)))
616 if (REG_P (XEXP (addr, 1)))
618 /* Scaled index with scale = 1 and disp. = 0 */
619 retval = CRX_SCALED_INDX;
620 base = XEXP (addr, 1);
621 index = XEXP (addr, 0);
624 else if (RTX_SIGNED_INT_FITS_N_BITS (XEXP (addr, 1), 28))
626 /* Register relative address and <= 28-bit disp. */
627 retval = CRX_REG_REL;
628 base = XEXP (addr, 0);
629 disp = XEXP (addr, 1);
636 /* Scaled index and <= 22-bit disp. */
637 retval = CRX_SCALED_INDX;
638 base = XEXP (XEXP (addr, 0), 1);
639 disp = XEXP (addr, 1);
640 if (!RTX_SIGNED_INT_FITS_N_BITS (disp, 22))
642 switch (GET_CODE (XEXP (XEXP (addr, 0), 0)))
645 /* Scaled index with scale = 0 and <= 22-bit disp. */
646 index = XEXP (XEXP (addr, 0), 0);
651 /* Scaled index with scale >= 0 and <= 22-bit disp. */
652 index = XEXP (XEXP (XEXP (addr, 0), 0), 0);
653 scale_rtx = XEXP (XEXP (XEXP (addr, 0), 0), 1);
654 if ((scale = SCALE_FOR_INDEX_P (scale_rtx)) == -1)
664 /* Scaled index with scale >= 0 */
665 retval = CRX_SCALED_INDX;
666 base = XEXP (addr, 1);
667 index = XEXP (XEXP (addr, 0), 0);
668 scale_rtx = XEXP (XEXP (addr, 0), 1);
669 /* Scaled index with scale >= 0 and <= 22-bit disp. */
670 if ((scale = SCALE_FOR_INDEX_P (scale_rtx)) == -1)
681 /* Simple post-increment */
682 retval = CRX_POST_INC;
683 base = XEXP (addr, 0);
688 /* Generic post-increment with <= 12-bit disp. */
689 retval = CRX_POST_INC;
690 base = XEXP (addr, 0);
691 side_effect = XEXP (addr, 1);
692 if (base != XEXP (side_effect, 0))
694 switch (GET_CODE (side_effect))
698 disp = XEXP (side_effect, 1);
699 if (!RTX_SIGNED_INT_FITS_N_BITS (disp, 12))
704 /* CRX only supports PLUS and MINUS */
713 if (base && !crx_addr_reg_p (base)) return CRX_INVALID;
714 if (index && !crx_addr_reg_p (index)) return CRX_INVALID;
720 out->side_effect = side_effect;
726 crx_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED,
727 rtx addr, int strict)
729 enum crx_addrtype addrtype;
730 struct crx_address address;
732 if (TARGET_DEBUG_ADDR)
735 "\n======\nGO_IF_LEGITIMATE_ADDRESS, mode = %s, strict = %d\n",
736 GET_MODE_NAME (mode), strict);
740 addrtype = crx_decompose_address (addr, &address);
742 if (addrtype == CRX_POST_INC && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
745 if (TARGET_DEBUG_ADDR)
754 typestr = "Register relative";
757 typestr = "Post-increment";
759 case CRX_SCALED_INDX:
760 typestr = "Scaled index";
763 typestr = "Absolute";
768 fprintf (stderr, "CRX Address type: %s\n", typestr);
771 if (addrtype == CRX_INVALID)
776 if (address.base && !REGNO_OK_FOR_BASE_P (REGNO (address.base)))
778 if (TARGET_DEBUG_ADDR)
779 fprintf (stderr, "Base register not strict\n");
782 if (address.index && !REGNO_OK_FOR_INDEX_P (REGNO (address.index)))
784 if (TARGET_DEBUG_ADDR)
785 fprintf (stderr, "Index register not strict\n");
793 /* ROUTINES TO COMPUTE COSTS */
794 /* ------------------------- */
796 /* Return cost of the memory address x. */
799 crx_address_cost (rtx addr, bool speed ATTRIBUTE_UNUSED)
801 enum crx_addrtype addrtype;
802 struct crx_address address;
806 addrtype = crx_decompose_address (addr, &address);
808 gcc_assert (addrtype != CRX_INVALID);
810 /* An absolute address causes a 3-word instruction */
811 if (addrtype == CRX_ABSOLUTE)
814 /* Post-modifying addresses are more powerful. */
815 if (addrtype == CRX_POST_INC)
818 /* Attempt to minimize number of registers in the address. */
822 if (address.index && address.scale == 1)
825 if (address.disp && !INT_CST4 (INTVAL (address.disp)))
828 if (TARGET_DEBUG_ADDR)
830 fprintf (stderr, "\n======\nTARGET_ADDRESS_COST = %d\n", cost);
837 /* Return the cost of moving data of mode MODE between a register of class
838 * RCLASS and memory; IN is zero if the value is to be written to memory,
839 * nonzero if it is to be read in. This cost is relative to those in
840 * REGISTER_MOVE_COST. */
843 crx_memory_move_cost (enum machine_mode mode,
844 enum reg_class rclass ATTRIBUTE_UNUSED,
845 int in ATTRIBUTE_UNUSED)
847 /* One LD or ST takes twice the time of a simple reg-reg move */
848 if (reg_classes_intersect_p (rclass, GENERAL_REGS))
850 /* printf ("GENERAL_REGS LD/ST = %d\n", 4 * HARD_REGNO_NREGS (0, mode));*/
851 return 4 * HARD_REGNO_NREGS (0, mode);
853 else if (reg_classes_intersect_p (rclass, HILO_REGS))
855 /* HILO to memory and vice versa */
856 /* printf ("HILO_REGS %s = %d\n", in ? "LD" : "ST",
857 (REGISTER_MOVE_COST (mode,
858 in ? GENERAL_REGS : HILO_REGS,
859 in ? HILO_REGS : GENERAL_REGS) + 4)
860 * HARD_REGNO_NREGS (0, mode)); */
861 return (REGISTER_MOVE_COST (mode,
862 in ? GENERAL_REGS : HILO_REGS,
863 in ? HILO_REGS : GENERAL_REGS) + 4)
864 * HARD_REGNO_NREGS (0, mode);
866 else /* default (like in i386) */
868 /* printf ("ANYREGS = 100\n"); */
873 /* INSTRUCTION OUTPUT */
874 /* ------------------ */
876 /* Check if a const_double is ok for crx store-immediate instructions */
879 crx_const_double_ok (rtx op)
881 if (GET_MODE (op) == DFmode)
885 REAL_VALUE_FROM_CONST_DOUBLE (r, op);
886 REAL_VALUE_TO_TARGET_DOUBLE (r, l);
887 return (UNSIGNED_INT_FITS_N_BITS (l[0], 4) &&
888 UNSIGNED_INT_FITS_N_BITS (l[1], 4)) ? 1 : 0;
891 if (GET_MODE (op) == SFmode)
895 REAL_VALUE_FROM_CONST_DOUBLE (r, op);
896 REAL_VALUE_TO_TARGET_SINGLE (r, l);
897 return UNSIGNED_INT_FITS_N_BITS (l, 4) ? 1 : 0;
900 return (UNSIGNED_INT_FITS_N_BITS (CONST_DOUBLE_LOW (op), 4) &&
901 UNSIGNED_INT_FITS_N_BITS (CONST_DOUBLE_HIGH (op), 4)) ? 1 : 0;
904 /* Implements the macro PRINT_OPERAND defined in crx.h. */
907 crx_print_operand (FILE * file, rtx x, int code)
912 if (GET_CODE (x) == REG) {
913 if (GET_MODE (x) == DImode || GET_MODE (x) == DFmode)
915 int regno = REGNO (x);
916 if (regno + 1 >= SP_REGNUM) abort ();
917 fprintf (file, "{%s, %s}", reg_names[regno], reg_names[regno + 1]);
922 if (REGNO (x) >= SP_REGNUM) abort ();
923 fprintf (file, "%s", reg_names[REGNO (x)]);
930 const char *crx_cmp_str;
931 switch (GET_CODE (x))
932 { /* MD: compare (reg, reg or imm) but CRX: cmp (reg or imm, reg)
933 * -> swap all non symmetric ops */
934 case EQ : crx_cmp_str = "eq"; break;
935 case NE : crx_cmp_str = "ne"; break;
936 case GT : crx_cmp_str = "lt"; break;
937 case GTU : crx_cmp_str = "lo"; break;
938 case LT : crx_cmp_str = "gt"; break;
939 case LTU : crx_cmp_str = "hi"; break;
940 case GE : crx_cmp_str = "le"; break;
941 case GEU : crx_cmp_str = "ls"; break;
942 case LE : crx_cmp_str = "ge"; break;
943 case LEU : crx_cmp_str = "hs"; break;
946 fprintf (file, "%s", crx_cmp_str);
951 /* Print high part of a double precision value. */
952 switch (GET_CODE (x))
955 if (GET_MODE (x) == SFmode) abort ();
956 if (GET_MODE (x) == DFmode)
958 /* High part of a DF const. */
962 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
963 REAL_VALUE_TO_TARGET_DOUBLE (r, l);
965 fprintf (file, "$0x%lx", l[1]);
969 /* -- Fallthrough to handle DI consts -- */
974 split_double (x, &low, &high);
976 output_addr_const (file, high);
981 if (REGNO (x) + 1 >= FIRST_PSEUDO_REGISTER) abort ();
982 fprintf (file, "%s", reg_names[REGNO (x) + 1]);
986 /* Adjust memory address to high part. */
989 adj_mem = adjust_address (adj_mem, GET_MODE (adj_mem), 4);
991 output_memory_reference_mode = GET_MODE (adj_mem);
992 output_address (XEXP (adj_mem, 0));
1001 /* Print low part of a double precision value. */
1002 switch (GET_CODE (x))
1005 if (GET_MODE (x) == SFmode) abort ();
1006 if (GET_MODE (x) == DFmode)
1008 /* High part of a DF const. */
1012 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
1013 REAL_VALUE_TO_TARGET_DOUBLE (r, l);
1015 fprintf (file, "$0x%lx", l[0]);
1019 /* -- Fallthrough to handle DI consts -- */
1024 split_double (x, &low, &high);
1026 output_addr_const (file, low);
1031 fprintf (file, "%s", reg_names[REGNO (x)]);
1035 output_memory_reference_mode = GET_MODE (x);
1036 output_address (XEXP (x, 0));
1043 case 0 : /* default */
1044 switch (GET_CODE (x))
1047 fprintf (file, "%s", reg_names[REGNO (x)]);
1051 output_memory_reference_mode = GET_MODE (x);
1052 output_address (XEXP (x, 0));
1060 /* Always use H and L for double precision - see above */
1061 gcc_assert (GET_MODE (x) == SFmode);
1063 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
1064 REAL_VALUE_TO_TARGET_SINGLE (r, l);
1066 fprintf (file, "$0x%lx", l);
1072 output_addr_const (file, x);
1077 output_operand_lossage ("invalid %%xn code");
1083 /* Implements the macro PRINT_OPERAND_ADDRESS defined in crx.h. */
1086 crx_print_operand_address (FILE * file, rtx addr)
1088 enum crx_addrtype addrtype;
1089 struct crx_address address;
1093 addrtype = crx_decompose_address (addr, &address);
1096 offset = INTVAL (address.disp);
1103 fprintf (file, "%d(%s)", offset, reg_names[REGNO (address.base)]);
1107 switch (GET_CODE (address.side_effect))
1115 offset = GET_MODE_SIZE (output_memory_reference_mode);
1118 offset = -GET_MODE_SIZE (output_memory_reference_mode);
1123 fprintf (file, "%d(%s)+", offset, reg_names[REGNO (address.base)]);
1126 case CRX_SCALED_INDX:
1127 fprintf (file, "%d(%s, %s, %d)", offset, reg_names[REGNO (address.base)],
1128 reg_names[REGNO (address.index)], address.scale);
1132 output_addr_const (file, address.disp);
1141 /*****************************************************************************/
1142 /* MACHINE DESCRIPTION HELPER-FUNCTIONS */
1143 /*****************************************************************************/
1145 void crx_expand_movmem_single (rtx src, rtx srcbase, rtx dst, rtx dstbase,
1146 rtx tmp_reg, unsigned HOST_WIDE_INT *offset_p)
1149 unsigned HOST_WIDE_INT offset = *offset_p;
1152 addr = plus_constant (src, offset);
1153 mem = adjust_automodify_address (srcbase, SImode, addr, offset);
1154 emit_move_insn (tmp_reg, mem);
1157 addr = plus_constant (dst, offset);
1158 mem = adjust_automodify_address (dstbase, SImode, addr, offset);
1159 emit_move_insn (mem, tmp_reg);
1161 *offset_p = offset + 4;
1165 crx_expand_movmem (rtx dstbase, rtx srcbase, rtx count_exp, rtx align_exp)
1167 unsigned HOST_WIDE_INT count = 0, offset, si_moves, i;
1168 HOST_WIDE_INT align = 0;
1173 if (GET_CODE (align_exp) == CONST_INT)
1174 { /* Only if aligned */
1175 align = INTVAL (align_exp);
1180 if (GET_CODE (count_exp) == CONST_INT)
1181 { /* No more than 16 SImode moves */
1182 count = INTVAL (count_exp);
1187 tmp_reg = gen_reg_rtx (SImode);
1189 /* Create psrs for the src and dest pointers */
1190 dst = copy_to_mode_reg (Pmode, XEXP (dstbase, 0));
1191 if (dst != XEXP (dstbase, 0))
1192 dstbase = replace_equiv_address_nv (dstbase, dst);
1193 src = copy_to_mode_reg (Pmode, XEXP (srcbase, 0));
1194 if (src != XEXP (srcbase, 0))
1195 srcbase = replace_equiv_address_nv (srcbase, src);
1199 /* Emit SImode moves */
1200 si_moves = count >> 2;
1201 for (i = 0; i < si_moves; i++)
1202 crx_expand_movmem_single (src, srcbase, dst, dstbase, tmp_reg, &offset);
1208 crx_expand_movmem_single (src, srcbase, dst, dstbase, tmp_reg, &offset);
1211 gcc_assert (offset == count);
1217 mpushpop_str (char *stringbuffer, const char *mnemonic, char *mask)
1219 if (strlen (mask) > 2 || crx_interrupt_function_p ()) /* needs 2-word instr. */
1220 sprintf (stringbuffer, "\n\t%s\tsp, {%s}", mnemonic, mask);
1221 else /* single word instruction */
1222 sprintf (stringbuffer, "\n\t%s\t%s", mnemonic, mask);
1225 /* Called from crx.md. The return value depends on the parameter push_or_pop:
1226 * When push_or_pop is zero -> string for push instructions of prologue.
1227 * When push_or_pop is nonzero -> string for pop/popret/retx in epilogue.
1228 * Relies on the assumptions:
1229 * 1. RA is the last register to be saved.
1230 * 2. The maximal value of the counter is MAX_COUNT. */
1233 crx_prepare_push_pop_string (int push_or_pop)
1235 /* j is the number of registers being saved, takes care that there won't be
1236 * more than 8 in one push/pop instruction */
1238 /* For the register mask string */
1239 static char mask_str[50];
1241 /* i is the index of save_regs[], going from 0 until last_reg_to_save */
1244 int ra_in_bitmask = 0;
1248 /* For reversing on the push instructions if there are more than one. */
1251 return_str = (char *) xmalloc (120);
1252 temp_str = (char *) xmalloc (120);
1255 memset (return_str, 0, 3);
1257 while (i <= last_reg_to_save)
1259 /* Prepare mask for one instruction. */
1263 { /* Add regs unit full or SP register reached */
1265 while (j < MAX_COUNT && i <= SP_REGNUM)
1269 /* TODO to use ra_in_bitmask for detecting last pop is not
1270 * smart it prevents things like: popret r5 */
1271 if (i == RETURN_ADDRESS_REGNUM) ra_in_bitmask = 1;
1272 if (j > 0) strcat (mask_str, ", ");
1273 strcat (mask_str, reg_names[i]);
1281 /* Handle hi/lo savings */
1282 while (i <= last_reg_to_save)
1286 strcat (mask_str, "lo, hi");
1287 i = last_reg_to_save + 1;
1294 if (strlen (mask_str) == 0) continue;
1296 if (push_or_pop == 1)
1298 if (crx_interrupt_function_p ())
1299 mpushpop_str (temp_str, "popx", mask_str);
1304 mpushpop_str (temp_str, "popret", mask_str);
1307 else mpushpop_str (temp_str, "pop", mask_str);
1310 strcat (return_str, temp_str);
1314 /* push - We need to reverse the order of the instructions if there
1315 * are more than one. (since the pop will not be reversed in the
1317 if (crx_interrupt_function_p ())
1318 mpushpop_str (temp_str, "pushx", mask_str);
1320 mpushpop_str (temp_str, "push", mask_str);
1321 strcat (temp_str, return_str);
1322 strcpy (strcat (return_str, "\t"), temp_str);
1327 if (push_or_pop == 1)
1330 if (crx_interrupt_function_p ())
1331 strcat (return_str, "\n\tretx\n");
1333 else if (!FUNC_IS_NORETURN_P (current_function_decl)
1334 && !save_regs[RETURN_ADDRESS_REGNUM])
1335 strcat (return_str, "\n\tjump\tra\n");
1338 /* Skip the newline and the tab in the start of return_str. */
1343 /* CompactRISC CRX Architecture stack layout:
1345 0 +---------------------
1350 +==================== Sp(x)=Ap(x+1)
1351 A | Args for functions
1352 | | called by X and Dynamically
1353 | | Dynamic allocations allocated and
1354 | | (alloca, variable deallocated
1355 Stack | length arrays).
1356 grows +-------------------- Fp(x)
1357 down| | Local variables of X
1358 ward| +--------------------
1359 | | Regs saved for X-1
1360 | +==================== Sp(x-1)=Ap(x)
1363 +-------------------- Fp(x-1)
1371 crx_expand_prologue (void)
1373 crx_compute_frame ();
1374 crx_compute_save_regs ();
1376 /* If there is no need in push and adjustment to sp, return. */
1377 if (size_for_adjusting_sp + sum_regs == 0)
1380 if (last_reg_to_save != -1)
1381 /* If there are registers to push. */
1382 emit_insn (gen_push_for_prologue (GEN_INT (sum_regs)));
1384 if (size_for_adjusting_sp > 0)
1385 emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
1386 GEN_INT (-size_for_adjusting_sp)));
1388 if (frame_pointer_needed)
1389 /* Initialize the frame pointer with the value of the stack pointer
1390 * pointing now to the locals. */
1391 emit_move_insn (frame_pointer_rtx, stack_pointer_rtx);
1394 /* Generate insn that updates the stack for local variables and padding for
1395 * registers we save. - Generate the appropriate return insn. */
1398 crx_expand_epilogue (void)
1402 /* Nonzero if we need to return and pop only RA. This will generate a
1403 * different insn. This differentiate is for the peepholes for call as last
1404 * statement in function. */
1405 int only_popret_RA = (save_regs[RETURN_ADDRESS_REGNUM]
1406 && (sum_regs == UNITS_PER_WORD));
1408 /* Return register. */
1409 return_reg = gen_rtx_REG (Pmode, RETURN_ADDRESS_REGNUM);
1411 if (frame_pointer_needed)
1412 /* Restore the stack pointer with the frame pointers value */
1413 emit_move_insn (stack_pointer_rtx, frame_pointer_rtx);
1415 if (size_for_adjusting_sp > 0)
1416 emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
1417 GEN_INT (size_for_adjusting_sp)));
1419 if (crx_interrupt_function_p ())
1420 emit_jump_insn (gen_interrupt_return ());
1421 else if (last_reg_to_save == -1)
1422 /* Nothing to pop */
1423 /* Don't output jump for interrupt routine, only retx. */
1424 emit_jump_insn (gen_indirect_jump_return ());
1425 else if (only_popret_RA)
1426 emit_jump_insn (gen_popret_RA_return ());
1428 emit_jump_insn (gen_pop_and_popret_return (GEN_INT (sum_regs)));