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, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published
10 by the Free Software Foundation; either version 3, or (at your
11 option) any later version.
13 GCC is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
16 License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /*****************************************************************************/
24 /*****************************************************************************/
28 #include "coretypes.h"
34 #include "hard-reg-set.h"
35 #include "insn-config.h"
36 #include "conditions.h"
38 #include "insn-codes.h"
39 #include "insn-attr.h"
46 #include "diagnostic-core.h"
47 #include "basic-block.h"
50 #include "target-def.h"
52 /*****************************************************************************/
54 /*****************************************************************************/
56 /* Maximum number of register used for passing parameters. */
57 #define MAX_REG_FOR_PASSING_ARGS 6
59 /* Minimum number register used for passing parameters. */
60 #define MIN_REG_FOR_PASSING_ARGS 2
62 /* The maximum count of words supported in the assembly of the architecture in
63 * a push/pop instruction. */
66 /* Predicate is true if the current function is a 'noreturn' function, i.e. it
67 * is qualified as volatile. */
68 #define FUNC_IS_NORETURN_P(decl) (TREE_THIS_VOLATILE (decl))
70 /* The following macros are used in crx_decompose_address () */
72 /* Returns the factor of a scaled index address or -1 if invalid. */
73 #define SCALE_FOR_INDEX_P(X) \
74 (GET_CODE (X) == CONST_INT ? \
75 (INTVAL (X) == 1 ? 1 : \
76 INTVAL (X) == 2 ? 2 : \
77 INTVAL (X) == 4 ? 4 : \
78 INTVAL (X) == 8 ? 8 : \
82 /* Nonzero if the rtx X is a signed const int of n bits */
83 #define RTX_SIGNED_INT_FITS_N_BITS(X,n) \
84 ((GET_CODE (X) == CONST_INT \
85 && SIGNED_INT_FITS_N_BITS (INTVAL (X), n)) ? 1 : 0)
87 /* Nonzero if the rtx X is an unsigned const int of n bits. */
88 #define RTX_UNSIGNED_INT_FITS_N_BITS(X, n) \
89 ((GET_CODE (X) == CONST_INT \
90 && UNSIGNED_INT_FITS_N_BITS (INTVAL (X), n)) ? 1 : 0)
92 /*****************************************************************************/
93 /* STATIC VARIABLES */
94 /*****************************************************************************/
96 /* Nonzero if the last param processed is passed in a register. */
97 static int last_parm_in_reg;
99 /* Will hold the number of the last register the prologue saves, -1 if no
100 * register is saved. */
101 static int last_reg_to_save;
103 /* Each object in the array is a register number. Mark 1 for registers that
104 * need to be saved. */
105 static int save_regs[FIRST_PSEUDO_REGISTER];
107 /* Number of bytes saved on the stack for non-scratch registers */
108 static int sum_regs = 0;
110 /* Number of bytes saved on the stack for local variables. */
111 static int local_vars_size;
113 /* The sum of 2 sizes: locals vars and padding byte for saving the registers.
114 * Used in expand_prologue () and expand_epilogue (). */
115 static int size_for_adjusting_sp;
117 /* In case of a POST_INC or POST_DEC memory reference, we must report the mode
118 * of the memory reference from PRINT_OPERAND to PRINT_OPERAND_ADDRESS. */
119 static enum machine_mode output_memory_reference_mode;
121 /*****************************************************************************/
122 /* TARGETM FUNCTION PROTOTYPES */
123 /*****************************************************************************/
125 static bool crx_fixed_condition_code_regs (unsigned int *, unsigned int *);
126 static rtx crx_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED,
127 int incoming ATTRIBUTE_UNUSED);
128 static bool crx_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED);
129 static int crx_address_cost (rtx, bool);
130 static bool crx_legitimate_address_p (enum machine_mode, rtx, bool);
131 static bool crx_can_eliminate (const int, const int);
132 static rtx crx_function_arg (CUMULATIVE_ARGS *, enum machine_mode,
134 static void crx_function_arg_advance (CUMULATIVE_ARGS *, enum machine_mode,
137 /*****************************************************************************/
139 /*****************************************************************************/
141 #undef TARGET_LEGITIMATE_ADDRESS_P
142 #define TARGET_LEGITIMATE_ADDRESS_P crx_legitimate_address_p
144 #undef TARGET_CAN_ELIMINATE
145 #define TARGET_CAN_ELIMINATE crx_can_eliminate
147 /*****************************************************************************/
148 /* STACK LAYOUT AND CALLING CONVENTIONS */
149 /*****************************************************************************/
151 #undef TARGET_FIXED_CONDITION_CODE_REGS
152 #define TARGET_FIXED_CONDITION_CODE_REGS crx_fixed_condition_code_regs
154 #undef TARGET_STRUCT_VALUE_RTX
155 #define TARGET_STRUCT_VALUE_RTX crx_struct_value_rtx
157 #undef TARGET_RETURN_IN_MEMORY
158 #define TARGET_RETURN_IN_MEMORY crx_return_in_memory
160 /*****************************************************************************/
161 /* PASSING FUNCTION ARGUMENTS */
162 /*****************************************************************************/
164 #undef TARGET_FUNCTION_ARG
165 #define TARGET_FUNCTION_ARG crx_function_arg
167 #undef TARGET_FUNCTION_ARG_ADVANCE
168 #define TARGET_FUNCTION_ARG_ADVANCE crx_function_arg_advance
170 /*****************************************************************************/
171 /* RELATIVE COSTS OF OPERATIONS */
172 /*****************************************************************************/
174 #undef TARGET_ADDRESS_COST
175 #define TARGET_ADDRESS_COST crx_address_cost
177 /*****************************************************************************/
178 /* TARGET-SPECIFIC USES OF `__attribute__' */
179 /*****************************************************************************/
181 #undef TARGET_ATTRIBUTE_TABLE
182 #define TARGET_ATTRIBUTE_TABLE crx_attribute_table
184 static const struct attribute_spec crx_attribute_table[] = {
185 /* ISRs have special prologue and epilogue requirements. */
186 {"interrupt", 0, 0, false, true, true, NULL, false},
187 {NULL, 0, 0, false, false, false, NULL, false}
190 /* Option handling. */
192 #undef TARGET_OPTION_OPTIMIZATION_TABLE
193 #define TARGET_OPTION_OPTIMIZATION_TABLE crx_option_optimization_table
195 static const struct default_options crx_option_optimization_table[] =
197 /* Put each function in its own section so that PAGE-instruction
198 relaxation can do its best. */
199 { OPT_LEVELS_1_PLUS, OPT_ffunction_sections, NULL, 1 },
200 { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
201 { OPT_LEVELS_NONE, 0, NULL, 0 }
204 /* Initialize 'targetm' variable which contains pointers to functions and data
205 * relating to the target machine. */
207 struct gcc_target targetm = TARGET_INITIALIZER;
210 /*****************************************************************************/
211 /* TARGET HOOK IMPLEMENTATIONS */
212 /*****************************************************************************/
214 /* Return the fixed registers used for condition codes. */
217 crx_fixed_condition_code_regs (unsigned int *p1, unsigned int *p2)
220 *p2 = INVALID_REGNUM;
224 /* Implements hook TARGET_STRUCT_VALUE_RTX. */
227 crx_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED,
228 int incoming ATTRIBUTE_UNUSED)
230 return gen_rtx_REG (Pmode, CRX_STRUCT_VALUE_REGNUM);
233 /* Implements hook TARGET_RETURN_IN_MEMORY. */
236 crx_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED)
238 if (TYPE_MODE (type) == BLKmode)
240 HOST_WIDE_INT size = int_size_in_bytes (type);
241 return (size == -1 || size > 8);
248 /*****************************************************************************/
249 /* MACRO IMPLEMENTATIONS */
250 /*****************************************************************************/
252 /* STACK LAYOUT AND CALLING CONVENTIONS ROUTINES */
253 /* --------------------------------------------- */
255 /* Return nonzero if the current function being compiled is an interrupt
256 * function as specified by the "interrupt" attribute. */
259 crx_interrupt_function_p (void)
263 attributes = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
264 return lookup_attribute ("interrupt", attributes) != NULL_TREE;
267 /* Compute values for the array save_regs and the variable sum_regs. The index
268 * of save_regs is numbers of register, each will get 1 if we need to save it
269 * in the current function, 0 if not. sum_regs is the total sum of the
270 * registers being saved. */
273 crx_compute_save_regs (void)
277 /* initialize here so in case the function is no-return it will be -1. */
278 last_reg_to_save = -1;
280 /* No need to save any registers if the function never returns. */
281 if (FUNC_IS_NORETURN_P (current_function_decl))
284 /* Initialize the number of bytes to be saved. */
287 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
289 if (fixed_regs[regno])
291 save_regs[regno] = 0;
295 /* If this reg is used and not call-used (except RA), save it. */
296 if (crx_interrupt_function_p ())
298 if (!current_function_is_leaf && call_used_regs[regno])
299 /* this is a volatile reg in a non-leaf interrupt routine - save it
300 * for the sake of its sons. */
301 save_regs[regno] = 1;
303 else if (df_regs_ever_live_p (regno))
304 /* This reg is used - save it. */
305 save_regs[regno] = 1;
307 /* This reg is not used, and is not a volatile - don't save. */
308 save_regs[regno] = 0;
312 /* If this reg is used and not call-used (except RA), save it. */
313 if (df_regs_ever_live_p (regno)
314 && (!call_used_regs[regno] || regno == RETURN_ADDRESS_REGNUM))
315 save_regs[regno] = 1;
317 save_regs[regno] = 0;
321 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
322 if (save_regs[regno] == 1)
324 last_reg_to_save = regno;
325 sum_regs += UNITS_PER_WORD;
329 /* Compute the size of the local area and the size to be adjusted by the
330 * prologue and epilogue. */
333 crx_compute_frame (void)
335 /* For aligning the local variables. */
336 int stack_alignment = STACK_BOUNDARY / BITS_PER_UNIT;
339 /* Padding needed for each element of the frame. */
340 local_vars_size = get_frame_size ();
342 /* Align to the stack alignment. */
343 padding_locals = local_vars_size % stack_alignment;
345 padding_locals = stack_alignment - padding_locals;
347 local_vars_size += padding_locals;
349 size_for_adjusting_sp = local_vars_size + (ACCUMULATE_OUTGOING_ARGS ?
350 crtl->outgoing_args_size : 0);
353 /* Worker function for TARGET_CAN_ELIMINATE. */
356 crx_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to)
358 return (to == STACK_POINTER_REGNUM ? ! frame_pointer_needed : true);
361 /* Implements the macro INITIAL_ELIMINATION_OFFSET, return the OFFSET. */
364 crx_initial_elimination_offset (int from, int to)
366 /* Compute this since we need to use sum_regs. */
367 crx_compute_save_regs ();
369 /* Compute this since we need to use local_vars_size. */
370 crx_compute_frame ();
372 if ((from) == FRAME_POINTER_REGNUM && (to) == STACK_POINTER_REGNUM)
373 return (ACCUMULATE_OUTGOING_ARGS ?
374 crtl->outgoing_args_size : 0);
375 else if ((from) == ARG_POINTER_REGNUM && (to) == FRAME_POINTER_REGNUM)
376 return (sum_regs + local_vars_size);
377 else if ((from) == ARG_POINTER_REGNUM && (to) == STACK_POINTER_REGNUM)
378 return (sum_regs + local_vars_size +
379 (ACCUMULATE_OUTGOING_ARGS ?
380 crtl->outgoing_args_size : 0));
388 /* Return the class number of the smallest class containing reg number REGNO.
389 * This could be a conditional expression or could index an array. */
392 crx_regno_reg_class (int regno)
394 if (regno >= 0 && regno < SP_REGNUM)
397 if (regno == SP_REGNUM)
400 if (regno == LO_REGNUM)
402 if (regno == HI_REGNUM)
408 /* Transfer between HILO_REGS and memory via secondary reloading. */
411 crx_secondary_reload_class (enum reg_class rclass,
412 enum machine_mode mode ATTRIBUTE_UNUSED,
413 rtx x ATTRIBUTE_UNUSED)
415 if (reg_classes_intersect_p (rclass, HILO_REGS)
416 && true_regnum (x) == -1)
422 /* Return 1 if hard register REGNO can hold a value of machine-mode MODE. */
425 crx_hard_regno_mode_ok (int regno, enum machine_mode mode)
427 /* CC can only hold CCmode values. */
428 if (regno == CC_REGNUM)
429 return GET_MODE_CLASS (mode) == MODE_CC;
430 if (GET_MODE_CLASS (mode) == MODE_CC)
432 /* HILO registers can only hold SImode and DImode */
433 if (HILO_REGNO_P (regno))
434 return mode == SImode || mode == DImode;
438 /* PASSING FUNCTION ARGUMENTS */
439 /* -------------------------- */
441 /* If enough param regs are available for passing the param of type TYPE return
442 * the number of registers needed else 0. */
445 enough_regs_for_param (CUMULATIVE_ARGS * cum, const_tree type,
446 enum machine_mode mode)
452 type_size = GET_MODE_BITSIZE (mode);
454 type_size = int_size_in_bytes (type) * BITS_PER_UNIT;
457 BITS_PER_WORD * (MAX_REG_FOR_PASSING_ARGS -
458 (MIN_REG_FOR_PASSING_ARGS + cum->ints) + 1);
460 /* Any variable which is too big to pass in two registers, will pass on
462 if ((remaining_size >= type_size) && (type_size <= 2 * BITS_PER_WORD))
463 return (type_size + BITS_PER_WORD - 1) / BITS_PER_WORD;
468 /* Implements TARGET_FUNCTION_ARG. */
471 crx_function_arg (CUMULATIVE_ARGS * cum, enum machine_mode mode,
472 const_tree type, bool named ATTRIBUTE_UNUSED)
474 last_parm_in_reg = 0;
476 /* Function_arg () is called with this type just after all the args have had
477 * their registers assigned. The rtx that function_arg returns from this type
478 * is supposed to pass to 'gen_call' but currently it is not implemented (see
479 * macro GEN_CALL). */
480 if (type == void_type_node)
483 if (targetm.calls.must_pass_in_stack (mode, type) || (cum->ints < 0))
488 /* Enable structures that need padding bytes at the end to pass to a
489 * function in registers. */
490 if (enough_regs_for_param (cum, type, mode) != 0)
492 last_parm_in_reg = 1;
493 return gen_rtx_REG (mode, MIN_REG_FOR_PASSING_ARGS + cum->ints);
497 if (MIN_REG_FOR_PASSING_ARGS + cum->ints > MAX_REG_FOR_PASSING_ARGS)
501 if (enough_regs_for_param (cum, type, mode) != 0)
503 last_parm_in_reg = 1;
504 return gen_rtx_REG (mode, MIN_REG_FOR_PASSING_ARGS + cum->ints);
511 /* Implements the macro INIT_CUMULATIVE_ARGS defined in crx.h. */
514 crx_init_cumulative_args (CUMULATIVE_ARGS * cum, tree fntype,
515 rtx libfunc ATTRIBUTE_UNUSED)
517 tree param, next_param;
521 /* Determine if this function has variable arguments. This is indicated by
522 * the last argument being 'void_type_mode' if there are no variable
523 * arguments. Change here for a different vararg. */
524 for (param = (fntype) ? TYPE_ARG_TYPES (fntype) : 0;
525 param != (tree) 0; param = next_param)
527 next_param = TREE_CHAIN (param);
528 if (next_param == (tree) 0 && TREE_VALUE (param) != void_type_node)
536 /* Implements TARGET_FUNCTION_ARG_ADVANCE. */
539 crx_function_arg_advance (CUMULATIVE_ARGS * cum, enum machine_mode mode,
540 const_tree type, bool named ATTRIBUTE_UNUSED)
542 /* l holds the number of registers required */
543 int l = GET_MODE_BITSIZE (mode) / BITS_PER_WORD;
545 /* If the parameter isn't passed on a register don't advance cum. */
546 if (!last_parm_in_reg)
549 if (targetm.calls.must_pass_in_stack (mode, type) || (cum->ints < 0))
552 if (mode == SImode || mode == HImode || mode == QImode || mode == DImode)
559 else if (mode == SFmode || mode == DFmode)
561 else if ((mode) == BLKmode)
563 if ((l = enough_regs_for_param (cum, type, mode)) != 0)
569 /* Implements the macro FUNCTION_ARG_REGNO_P defined in crx.h. Return nonzero
570 * if N is a register used for passing parameters. */
573 crx_function_arg_regno_p (int n)
575 return (n <= MAX_REG_FOR_PASSING_ARGS && n >= MIN_REG_FOR_PASSING_ARGS);
578 /* ADDRESSING MODES */
579 /* ---------------- */
581 /* Implements the hook for TARGET_LEGITIMATE_ADDRESS_P defined in crx.h.
582 * The following addressing modes are supported on CRX:
584 * Relocations --> const | symbol_ref | label_ref
585 * Absolute address --> 32-bit absolute
586 * Post increment --> reg + 12-bit disp.
587 * Post modify --> reg + 12-bit disp.
588 * Register relative --> reg | 32-bit disp. + reg | 4 bit + reg
589 * Scaled index --> reg + reg | 22-bit disp. + reg + reg |
590 * 22-disp. + reg + reg + (2 | 4 | 8) */
593 crx_addr_reg (rtx addr_reg)
595 if (GET_MODE (addr_reg) != Pmode)
598 if (REG_P (addr_reg))
600 else if (GET_CODE (addr_reg) == SUBREG
601 && REG_P (SUBREG_REG (addr_reg))
602 && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (addr_reg)))
604 return SUBREG_REG (addr_reg);
610 crx_decompose_address (rtx addr, struct crx_address *out)
612 rtx base = NULL_RTX, index = NULL_RTX, disp = NULL_RTX;
613 rtx scale_rtx = NULL_RTX, side_effect = NULL_RTX;
616 enum crx_addrtype retval = CRX_INVALID;
618 switch (GET_CODE (addr))
621 /* Absolute address (known at compile time) */
622 retval = CRX_ABSOLUTE;
624 if (!UNSIGNED_INT_FITS_N_BITS (INTVAL (disp), GET_MODE_BITSIZE (Pmode)))
631 /* Absolute address (known at link time) */
632 retval = CRX_ABSOLUTE;
638 /* Register relative address */
639 retval = CRX_REG_REL;
644 switch (GET_CODE (XEXP (addr, 0)))
648 if (REG_P (XEXP (addr, 1)))
650 /* Scaled index with scale = 1 and disp. = 0 */
651 retval = CRX_SCALED_INDX;
652 base = XEXP (addr, 1);
653 index = XEXP (addr, 0);
656 else if (RTX_SIGNED_INT_FITS_N_BITS (XEXP (addr, 1), 28))
658 /* Register relative address and <= 28-bit disp. */
659 retval = CRX_REG_REL;
660 base = XEXP (addr, 0);
661 disp = XEXP (addr, 1);
668 /* Scaled index and <= 22-bit disp. */
669 retval = CRX_SCALED_INDX;
670 base = XEXP (XEXP (addr, 0), 1);
671 disp = XEXP (addr, 1);
672 if (!RTX_SIGNED_INT_FITS_N_BITS (disp, 22))
674 switch (GET_CODE (XEXP (XEXP (addr, 0), 0)))
677 /* Scaled index with scale = 0 and <= 22-bit disp. */
678 index = XEXP (XEXP (addr, 0), 0);
683 /* Scaled index with scale >= 0 and <= 22-bit disp. */
684 index = XEXP (XEXP (XEXP (addr, 0), 0), 0);
685 scale_rtx = XEXP (XEXP (XEXP (addr, 0), 0), 1);
686 if ((scale = SCALE_FOR_INDEX_P (scale_rtx)) == -1)
696 /* Scaled index with scale >= 0 */
697 retval = CRX_SCALED_INDX;
698 base = XEXP (addr, 1);
699 index = XEXP (XEXP (addr, 0), 0);
700 scale_rtx = XEXP (XEXP (addr, 0), 1);
701 /* Scaled index with scale >= 0 and <= 22-bit disp. */
702 if ((scale = SCALE_FOR_INDEX_P (scale_rtx)) == -1)
713 /* Simple post-increment */
714 retval = CRX_POST_INC;
715 base = XEXP (addr, 0);
720 /* Generic post-increment with <= 12-bit disp. */
721 retval = CRX_POST_INC;
722 base = XEXP (addr, 0);
723 side_effect = XEXP (addr, 1);
724 if (base != XEXP (side_effect, 0))
726 switch (GET_CODE (side_effect))
730 disp = XEXP (side_effect, 1);
731 if (!RTX_SIGNED_INT_FITS_N_BITS (disp, 12))
736 /* CRX only supports PLUS and MINUS */
747 base = crx_addr_reg (base);
753 index = crx_addr_reg (index);
762 out->side_effect = side_effect;
768 crx_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED,
769 rtx addr, bool strict)
771 enum crx_addrtype addrtype;
772 struct crx_address address;
774 if (TARGET_DEBUG_ADDR)
777 "\n======\nGO_IF_LEGITIMATE_ADDRESS, mode = %s, strict = %d\n",
778 GET_MODE_NAME (mode), strict);
782 addrtype = crx_decompose_address (addr, &address);
784 if (addrtype == CRX_POST_INC && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
787 if (TARGET_DEBUG_ADDR)
796 typestr = "Register relative";
799 typestr = "Post-increment";
801 case CRX_SCALED_INDX:
802 typestr = "Scaled index";
805 typestr = "Absolute";
810 fprintf (stderr, "CRX Address type: %s\n", typestr);
813 if (addrtype == CRX_INVALID)
818 if (address.base && !REGNO_OK_FOR_BASE_P (REGNO (address.base)))
820 if (TARGET_DEBUG_ADDR)
821 fprintf (stderr, "Base register not strict\n");
824 if (address.index && !REGNO_OK_FOR_INDEX_P (REGNO (address.index)))
826 if (TARGET_DEBUG_ADDR)
827 fprintf (stderr, "Index register not strict\n");
835 /* ROUTINES TO COMPUTE COSTS */
836 /* ------------------------- */
838 /* Return cost of the memory address x. */
841 crx_address_cost (rtx addr, bool speed ATTRIBUTE_UNUSED)
843 enum crx_addrtype addrtype;
844 struct crx_address address;
848 addrtype = crx_decompose_address (addr, &address);
850 gcc_assert (addrtype != CRX_INVALID);
852 /* An absolute address causes a 3-word instruction */
853 if (addrtype == CRX_ABSOLUTE)
856 /* Post-modifying addresses are more powerful. */
857 if (addrtype == CRX_POST_INC)
860 /* Attempt to minimize number of registers in the address. */
864 if (address.index && address.scale == 1)
867 if (address.disp && !INT_CST4 (INTVAL (address.disp)))
870 if (TARGET_DEBUG_ADDR)
872 fprintf (stderr, "\n======\nTARGET_ADDRESS_COST = %d\n", cost);
879 /* Return the cost of moving data of mode MODE between a register of class
880 * RCLASS and memory; IN is zero if the value is to be written to memory,
881 * nonzero if it is to be read in. This cost is relative to those in
882 * REGISTER_MOVE_COST. */
885 crx_memory_move_cost (enum machine_mode mode,
886 enum reg_class rclass ATTRIBUTE_UNUSED,
887 int in ATTRIBUTE_UNUSED)
889 /* One LD or ST takes twice the time of a simple reg-reg move */
890 if (reg_classes_intersect_p (rclass, GENERAL_REGS))
892 /* printf ("GENERAL_REGS LD/ST = %d\n", 4 * HARD_REGNO_NREGS (0, mode));*/
893 return 4 * HARD_REGNO_NREGS (0, mode);
895 else if (reg_classes_intersect_p (rclass, HILO_REGS))
897 /* HILO to memory and vice versa */
898 /* printf ("HILO_REGS %s = %d\n", in ? "LD" : "ST",
899 (REGISTER_MOVE_COST (mode,
900 in ? GENERAL_REGS : HILO_REGS,
901 in ? HILO_REGS : GENERAL_REGS) + 4)
902 * HARD_REGNO_NREGS (0, mode)); */
903 return (REGISTER_MOVE_COST (mode,
904 in ? GENERAL_REGS : HILO_REGS,
905 in ? HILO_REGS : GENERAL_REGS) + 4)
906 * HARD_REGNO_NREGS (0, mode);
908 else /* default (like in i386) */
910 /* printf ("ANYREGS = 100\n"); */
915 /* INSTRUCTION OUTPUT */
916 /* ------------------ */
918 /* Check if a const_double is ok for crx store-immediate instructions */
921 crx_const_double_ok (rtx op)
923 if (GET_MODE (op) == DFmode)
927 REAL_VALUE_FROM_CONST_DOUBLE (r, op);
928 REAL_VALUE_TO_TARGET_DOUBLE (r, l);
929 return (UNSIGNED_INT_FITS_N_BITS (l[0], 4) &&
930 UNSIGNED_INT_FITS_N_BITS (l[1], 4)) ? 1 : 0;
933 if (GET_MODE (op) == SFmode)
937 REAL_VALUE_FROM_CONST_DOUBLE (r, op);
938 REAL_VALUE_TO_TARGET_SINGLE (r, l);
939 return UNSIGNED_INT_FITS_N_BITS (l, 4) ? 1 : 0;
942 return (UNSIGNED_INT_FITS_N_BITS (CONST_DOUBLE_LOW (op), 4) &&
943 UNSIGNED_INT_FITS_N_BITS (CONST_DOUBLE_HIGH (op), 4)) ? 1 : 0;
946 /* Implements the macro PRINT_OPERAND defined in crx.h. */
949 crx_print_operand (FILE * file, rtx x, int code)
954 if (GET_CODE (x) == REG) {
955 if (GET_MODE (x) == DImode || GET_MODE (x) == DFmode)
957 int regno = REGNO (x);
958 if (regno + 1 >= SP_REGNUM) abort ();
959 fprintf (file, "{%s, %s}", reg_names[regno], reg_names[regno + 1]);
964 if (REGNO (x) >= SP_REGNUM) abort ();
965 fprintf (file, "%s", reg_names[REGNO (x)]);
972 const char *crx_cmp_str;
973 switch (GET_CODE (x))
974 { /* MD: compare (reg, reg or imm) but CRX: cmp (reg or imm, reg)
975 * -> swap all non symmetric ops */
976 case EQ : crx_cmp_str = "eq"; break;
977 case NE : crx_cmp_str = "ne"; break;
978 case GT : crx_cmp_str = "lt"; break;
979 case GTU : crx_cmp_str = "lo"; break;
980 case LT : crx_cmp_str = "gt"; break;
981 case LTU : crx_cmp_str = "hi"; break;
982 case GE : crx_cmp_str = "le"; break;
983 case GEU : crx_cmp_str = "ls"; break;
984 case LE : crx_cmp_str = "ge"; break;
985 case LEU : crx_cmp_str = "hs"; break;
988 fprintf (file, "%s", crx_cmp_str);
993 /* Print high part of a double precision value. */
994 switch (GET_CODE (x))
997 if (GET_MODE (x) == SFmode) abort ();
998 if (GET_MODE (x) == DFmode)
1000 /* High part of a DF const. */
1004 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
1005 REAL_VALUE_TO_TARGET_DOUBLE (r, l);
1007 fprintf (file, "$0x%lx", l[1]);
1011 /* -- Fallthrough to handle DI consts -- */
1016 split_double (x, &low, &high);
1018 output_addr_const (file, high);
1023 if (REGNO (x) + 1 >= FIRST_PSEUDO_REGISTER) abort ();
1024 fprintf (file, "%s", reg_names[REGNO (x) + 1]);
1028 /* Adjust memory address to high part. */
1031 adj_mem = adjust_address (adj_mem, GET_MODE (adj_mem), 4);
1033 output_memory_reference_mode = GET_MODE (adj_mem);
1034 output_address (XEXP (adj_mem, 0));
1043 /* Print low part of a double precision value. */
1044 switch (GET_CODE (x))
1047 if (GET_MODE (x) == SFmode) abort ();
1048 if (GET_MODE (x) == DFmode)
1050 /* High part of a DF const. */
1054 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
1055 REAL_VALUE_TO_TARGET_DOUBLE (r, l);
1057 fprintf (file, "$0x%lx", l[0]);
1061 /* -- Fallthrough to handle DI consts -- */
1066 split_double (x, &low, &high);
1068 output_addr_const (file, low);
1073 fprintf (file, "%s", reg_names[REGNO (x)]);
1077 output_memory_reference_mode = GET_MODE (x);
1078 output_address (XEXP (x, 0));
1085 case 0 : /* default */
1086 switch (GET_CODE (x))
1089 fprintf (file, "%s", reg_names[REGNO (x)]);
1093 output_memory_reference_mode = GET_MODE (x);
1094 output_address (XEXP (x, 0));
1102 /* Always use H and L for double precision - see above */
1103 gcc_assert (GET_MODE (x) == SFmode);
1105 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
1106 REAL_VALUE_TO_TARGET_SINGLE (r, l);
1108 fprintf (file, "$0x%lx", l);
1114 output_addr_const (file, x);
1119 output_operand_lossage ("invalid %%xn code");
1125 /* Implements the macro PRINT_OPERAND_ADDRESS defined in crx.h. */
1128 crx_print_operand_address (FILE * file, rtx addr)
1130 enum crx_addrtype addrtype;
1131 struct crx_address address;
1135 addrtype = crx_decompose_address (addr, &address);
1138 offset = INTVAL (address.disp);
1145 fprintf (file, "%d(%s)", offset, reg_names[REGNO (address.base)]);
1149 switch (GET_CODE (address.side_effect))
1157 offset = GET_MODE_SIZE (output_memory_reference_mode);
1160 offset = -GET_MODE_SIZE (output_memory_reference_mode);
1165 fprintf (file, "%d(%s)+", offset, reg_names[REGNO (address.base)]);
1168 case CRX_SCALED_INDX:
1169 fprintf (file, "%d(%s, %s, %d)", offset, reg_names[REGNO (address.base)],
1170 reg_names[REGNO (address.index)], address.scale);
1174 output_addr_const (file, address.disp);
1183 /*****************************************************************************/
1184 /* MACHINE DESCRIPTION HELPER-FUNCTIONS */
1185 /*****************************************************************************/
1187 void crx_expand_movmem_single (rtx src, rtx srcbase, rtx dst, rtx dstbase,
1188 rtx tmp_reg, unsigned HOST_WIDE_INT *offset_p)
1191 unsigned HOST_WIDE_INT offset = *offset_p;
1194 addr = plus_constant (src, offset);
1195 mem = adjust_automodify_address (srcbase, SImode, addr, offset);
1196 emit_move_insn (tmp_reg, mem);
1199 addr = plus_constant (dst, offset);
1200 mem = adjust_automodify_address (dstbase, SImode, addr, offset);
1201 emit_move_insn (mem, tmp_reg);
1203 *offset_p = offset + 4;
1207 crx_expand_movmem (rtx dstbase, rtx srcbase, rtx count_exp, rtx align_exp)
1209 unsigned HOST_WIDE_INT count = 0, offset, si_moves, i;
1210 HOST_WIDE_INT align = 0;
1215 if (GET_CODE (align_exp) == CONST_INT)
1216 { /* Only if aligned */
1217 align = INTVAL (align_exp);
1222 if (GET_CODE (count_exp) == CONST_INT)
1223 { /* No more than 16 SImode moves */
1224 count = INTVAL (count_exp);
1229 tmp_reg = gen_reg_rtx (SImode);
1231 /* Create psrs for the src and dest pointers */
1232 dst = copy_to_mode_reg (Pmode, XEXP (dstbase, 0));
1233 if (dst != XEXP (dstbase, 0))
1234 dstbase = replace_equiv_address_nv (dstbase, dst);
1235 src = copy_to_mode_reg (Pmode, XEXP (srcbase, 0));
1236 if (src != XEXP (srcbase, 0))
1237 srcbase = replace_equiv_address_nv (srcbase, src);
1241 /* Emit SImode moves */
1242 si_moves = count >> 2;
1243 for (i = 0; i < si_moves; i++)
1244 crx_expand_movmem_single (src, srcbase, dst, dstbase, tmp_reg, &offset);
1250 crx_expand_movmem_single (src, srcbase, dst, dstbase, tmp_reg, &offset);
1253 gcc_assert (offset == count);
1259 mpushpop_str (char *stringbuffer, const char *mnemonic, char *mask)
1261 if (strlen (mask) > 2 || crx_interrupt_function_p ()) /* needs 2-word instr. */
1262 sprintf (stringbuffer, "\n\t%s\tsp, {%s}", mnemonic, mask);
1263 else /* single word instruction */
1264 sprintf (stringbuffer, "\n\t%s\t%s", mnemonic, mask);
1267 /* Called from crx.md. The return value depends on the parameter push_or_pop:
1268 * When push_or_pop is zero -> string for push instructions of prologue.
1269 * When push_or_pop is nonzero -> string for pop/popret/retx in epilogue.
1270 * Relies on the assumptions:
1271 * 1. RA is the last register to be saved.
1272 * 2. The maximal value of the counter is MAX_COUNT. */
1275 crx_prepare_push_pop_string (int push_or_pop)
1277 /* j is the number of registers being saved, takes care that there won't be
1278 * more than 8 in one push/pop instruction */
1280 /* For the register mask string */
1281 static char mask_str[50];
1283 /* i is the index of save_regs[], going from 0 until last_reg_to_save */
1286 int ra_in_bitmask = 0;
1290 /* For reversing on the push instructions if there are more than one. */
1293 return_str = (char *) xmalloc (120);
1294 temp_str = (char *) xmalloc (120);
1297 memset (return_str, 0, 3);
1299 while (i <= last_reg_to_save)
1301 /* Prepare mask for one instruction. */
1305 { /* Add regs unit full or SP register reached */
1307 while (j < MAX_COUNT && i <= SP_REGNUM)
1311 /* TODO to use ra_in_bitmask for detecting last pop is not
1312 * smart it prevents things like: popret r5 */
1313 if (i == RETURN_ADDRESS_REGNUM) ra_in_bitmask = 1;
1314 if (j > 0) strcat (mask_str, ", ");
1315 strcat (mask_str, reg_names[i]);
1323 /* Handle hi/lo savings */
1324 while (i <= last_reg_to_save)
1328 strcat (mask_str, "lo, hi");
1329 i = last_reg_to_save + 1;
1336 if (strlen (mask_str) == 0) continue;
1338 if (push_or_pop == 1)
1340 if (crx_interrupt_function_p ())
1341 mpushpop_str (temp_str, "popx", mask_str);
1346 mpushpop_str (temp_str, "popret", mask_str);
1349 else mpushpop_str (temp_str, "pop", mask_str);
1352 strcat (return_str, temp_str);
1356 /* push - We need to reverse the order of the instructions if there
1357 * are more than one. (since the pop will not be reversed in the
1359 if (crx_interrupt_function_p ())
1360 mpushpop_str (temp_str, "pushx", mask_str);
1362 mpushpop_str (temp_str, "push", mask_str);
1363 strcat (temp_str, return_str);
1364 strcpy (strcat (return_str, "\t"), temp_str);
1369 if (push_or_pop == 1)
1372 if (crx_interrupt_function_p ())
1373 strcat (return_str, "\n\tretx\n");
1375 else if (!FUNC_IS_NORETURN_P (current_function_decl)
1376 && !save_regs[RETURN_ADDRESS_REGNUM])
1377 strcat (return_str, "\n\tjump\tra\n");
1380 /* Skip the newline and the tab in the start of return_str. */
1385 /* CompactRISC CRX Architecture stack layout:
1387 0 +---------------------
1392 +==================== Sp(x)=Ap(x+1)
1393 A | Args for functions
1394 | | called by X and Dynamically
1395 | | Dynamic allocations allocated and
1396 | | (alloca, variable deallocated
1397 Stack | length arrays).
1398 grows +-------------------- Fp(x)
1399 down| | Local variables of X
1400 ward| +--------------------
1401 | | Regs saved for X-1
1402 | +==================== Sp(x-1)=Ap(x)
1405 +-------------------- Fp(x-1)
1413 crx_expand_prologue (void)
1415 crx_compute_frame ();
1416 crx_compute_save_regs ();
1418 /* If there is no need in push and adjustment to sp, return. */
1419 if (size_for_adjusting_sp + sum_regs == 0)
1422 if (last_reg_to_save != -1)
1423 /* If there are registers to push. */
1424 emit_insn (gen_push_for_prologue (GEN_INT (sum_regs)));
1426 if (size_for_adjusting_sp > 0)
1427 emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
1428 GEN_INT (-size_for_adjusting_sp)));
1430 if (frame_pointer_needed)
1431 /* Initialize the frame pointer with the value of the stack pointer
1432 * pointing now to the locals. */
1433 emit_move_insn (frame_pointer_rtx, stack_pointer_rtx);
1436 /* Generate insn that updates the stack for local variables and padding for
1437 * registers we save. - Generate the appropriate return insn. */
1440 crx_expand_epilogue (void)
1442 /* Nonzero if we need to return and pop only RA. This will generate a
1443 * different insn. This differentiate is for the peepholes for call as last
1444 * statement in function. */
1445 int only_popret_RA = (save_regs[RETURN_ADDRESS_REGNUM]
1446 && (sum_regs == UNITS_PER_WORD));
1448 if (frame_pointer_needed)
1449 /* Restore the stack pointer with the frame pointers value */
1450 emit_move_insn (stack_pointer_rtx, frame_pointer_rtx);
1452 if (size_for_adjusting_sp > 0)
1453 emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
1454 GEN_INT (size_for_adjusting_sp)));
1456 if (crx_interrupt_function_p ())
1457 emit_jump_insn (gen_interrupt_return ());
1458 else if (last_reg_to_save == -1)
1459 /* Nothing to pop */
1460 /* Don't output jump for interrupt routine, only retx. */
1461 emit_jump_insn (gen_indirect_jump_return ());
1462 else if (only_popret_RA)
1463 emit_jump_insn (gen_popret_RA_return ());
1465 emit_jump_insn (gen_pop_and_popret_return (GEN_INT (sum_regs)));