1 /* Convert tree expression to rtl instructions, for GNU compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
31 #include "hard-reg-set.h"
34 #include "insn-flags.h"
35 #include "insn-codes.h"
36 #include "insn-config.h"
37 /* Include expr.h after insn-config.h so we get HAVE_conditional_move. */
41 #include "typeclass.h"
47 /* Decide whether a function's arguments should be processed
48 from first to last or from last to first.
50 They should if the stack and args grow in opposite directions, but
51 only if we have push insns. */
55 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
56 #define PUSH_ARGS_REVERSED /* If it's last to first */
61 #ifndef STACK_PUSH_CODE
62 #ifdef STACK_GROWS_DOWNWARD
63 #define STACK_PUSH_CODE PRE_DEC
65 #define STACK_PUSH_CODE PRE_INC
69 /* Assume that case vectors are not pc-relative. */
70 #ifndef CASE_VECTOR_PC_RELATIVE
71 #define CASE_VECTOR_PC_RELATIVE 0
74 /* If this is nonzero, we do not bother generating VOLATILE
75 around volatile memory references, and we are willing to
76 output indirect addresses. If cse is to follow, we reject
77 indirect addresses so a useful potential cse is generated;
78 if it is used only once, instruction combination will produce
79 the same indirect address eventually. */
82 /* Nonzero to generate code for all the subroutines within an
83 expression before generating the upper levels of the expression.
84 Nowadays this is never zero. */
85 int do_preexpand_calls = 1;
87 /* Don't check memory usage, since code is being emitted to check a memory
88 usage. Used when current_function_check_memory_usage is true, to avoid
89 infinite recursion. */
90 static int in_check_memory_usage;
92 /* Chain of pending expressions for PLACEHOLDER_EXPR to replace. */
93 static tree placeholder_list = 0;
95 /* This structure is used by move_by_pieces to describe the move to
108 int explicit_inc_from;
116 /* This structure is used by clear_by_pieces to describe the clear to
119 struct clear_by_pieces
131 extern struct obstack permanent_obstack;
133 static rtx get_push_address PARAMS ((int));
135 static rtx enqueue_insn PARAMS ((rtx, rtx));
136 static int move_by_pieces_ninsns PARAMS ((unsigned int, unsigned int));
137 static void move_by_pieces_1 PARAMS ((rtx (*) (rtx, ...), enum machine_mode,
138 struct move_by_pieces *));
139 static void clear_by_pieces PARAMS ((rtx, int, unsigned int));
140 static void clear_by_pieces_1 PARAMS ((rtx (*) (rtx, ...),
142 struct clear_by_pieces *));
143 static int is_zeros_p PARAMS ((tree));
144 static int mostly_zeros_p PARAMS ((tree));
145 static void store_constructor_field PARAMS ((rtx, int, int, enum machine_mode,
146 tree, tree, unsigned int, int));
147 static void store_constructor PARAMS ((tree, rtx, unsigned int, int, int));
148 static rtx store_field PARAMS ((rtx, int, int, enum machine_mode,
149 tree, enum machine_mode, int,
150 unsigned int, int, int));
151 static enum memory_use_mode
152 get_memory_usage_from_modifier PARAMS ((enum expand_modifier));
153 static tree save_noncopied_parts PARAMS ((tree, tree));
154 static tree init_noncopied_parts PARAMS ((tree, tree));
155 static int safe_from_p PARAMS ((rtx, tree, int));
156 static int fixed_type_p PARAMS ((tree));
157 static rtx var_rtx PARAMS ((tree));
158 static int readonly_fields_p PARAMS ((tree));
159 static rtx expand_expr_unaligned PARAMS ((tree, unsigned int *));
160 static rtx expand_increment PARAMS ((tree, int, int));
161 static void preexpand_calls PARAMS ((tree));
162 static void do_jump_by_parts_greater PARAMS ((tree, int, rtx, rtx));
163 static void do_jump_by_parts_equality PARAMS ((tree, rtx, rtx));
164 static void do_compare_and_jump PARAMS ((tree, enum rtx_code, enum rtx_code, rtx, rtx));
165 static rtx do_store_flag PARAMS ((tree, rtx, enum machine_mode, int));
167 /* Record for each mode whether we can move a register directly to or
168 from an object of that mode in memory. If we can't, we won't try
169 to use that mode directly when accessing a field of that mode. */
171 static char direct_load[NUM_MACHINE_MODES];
172 static char direct_store[NUM_MACHINE_MODES];
174 /* If a memory-to-memory move would take MOVE_RATIO or more simple
175 move-instruction sequences, we will do a movstr or libcall instead. */
178 #if defined (HAVE_movstrqi) || defined (HAVE_movstrhi) || defined (HAVE_movstrsi) || defined (HAVE_movstrdi) || defined (HAVE_movstrti)
181 /* If we are optimizing for space (-Os), cut down the default move ratio */
182 #define MOVE_RATIO (optimize_size ? 3 : 15)
186 /* This macro is used to determine whether move_by_pieces should be called
187 to perform a structure copy. */
188 #ifndef MOVE_BY_PIECES_P
189 #define MOVE_BY_PIECES_P(SIZE, ALIGN) (move_by_pieces_ninsns \
190 (SIZE, ALIGN) < MOVE_RATIO)
193 /* This array records the insn_code of insns to perform block moves. */
194 enum insn_code movstr_optab[NUM_MACHINE_MODES];
196 /* This array records the insn_code of insns to perform block clears. */
197 enum insn_code clrstr_optab[NUM_MACHINE_MODES];
199 /* SLOW_UNALIGNED_ACCESS is non-zero if unaligned accesses are very slow. */
201 #ifndef SLOW_UNALIGNED_ACCESS
202 #define SLOW_UNALIGNED_ACCESS(MODE, ALIGN) STRICT_ALIGNMENT
205 /* This is run once per compilation to set up which modes can be used
206 directly in memory and to initialize the block move optab. */
212 enum machine_mode mode;
219 /* Since we are on the permanent obstack, we must be sure we save this
220 spot AFTER we call start_sequence, since it will reuse the rtl it
222 free_point = (char *) oballoc (0);
224 /* Try indexing by frame ptr and try by stack ptr.
225 It is known that on the Convex the stack ptr isn't a valid index.
226 With luck, one or the other is valid on any machine. */
227 mem = gen_rtx_MEM (VOIDmode, stack_pointer_rtx);
228 mem1 = gen_rtx_MEM (VOIDmode, frame_pointer_rtx);
230 insn = emit_insn (gen_rtx_SET (0, NULL_RTX, NULL_RTX));
231 pat = PATTERN (insn);
233 for (mode = VOIDmode; (int) mode < NUM_MACHINE_MODES;
234 mode = (enum machine_mode) ((int) mode + 1))
239 direct_load[(int) mode] = direct_store[(int) mode] = 0;
240 PUT_MODE (mem, mode);
241 PUT_MODE (mem1, mode);
243 /* See if there is some register that can be used in this mode and
244 directly loaded or stored from memory. */
246 if (mode != VOIDmode && mode != BLKmode)
247 for (regno = 0; regno < FIRST_PSEUDO_REGISTER
248 && (direct_load[(int) mode] == 0 || direct_store[(int) mode] == 0);
251 if (! HARD_REGNO_MODE_OK (regno, mode))
254 reg = gen_rtx_REG (mode, regno);
257 SET_DEST (pat) = reg;
258 if (recog (pat, insn, &num_clobbers) >= 0)
259 direct_load[(int) mode] = 1;
261 SET_SRC (pat) = mem1;
262 SET_DEST (pat) = reg;
263 if (recog (pat, insn, &num_clobbers) >= 0)
264 direct_load[(int) mode] = 1;
267 SET_DEST (pat) = mem;
268 if (recog (pat, insn, &num_clobbers) >= 0)
269 direct_store[(int) mode] = 1;
272 SET_DEST (pat) = mem1;
273 if (recog (pat, insn, &num_clobbers) >= 0)
274 direct_store[(int) mode] = 1;
282 /* This is run at the start of compiling a function. */
287 cfun->expr = (struct expr_status *) xmalloc (sizeof (struct expr_status));
290 pending_stack_adjust = 0;
291 inhibit_defer_pop = 0;
293 apply_args_value = 0;
299 struct expr_status *p;
304 ggc_mark_rtx (p->x_saveregs_value);
305 ggc_mark_rtx (p->x_apply_args_value);
306 ggc_mark_rtx (p->x_forced_labels);
317 /* Small sanity check that the queue is empty at the end of a function. */
319 finish_expr_for_function ()
325 /* Manage the queue of increment instructions to be output
326 for POSTINCREMENT_EXPR expressions, etc. */
328 /* Queue up to increment (or change) VAR later. BODY says how:
329 BODY should be the same thing you would pass to emit_insn
330 to increment right away. It will go to emit_insn later on.
332 The value is a QUEUED expression to be used in place of VAR
333 where you want to guarantee the pre-incrementation value of VAR. */
336 enqueue_insn (var, body)
339 pending_chain = gen_rtx_QUEUED (GET_MODE (var), var, NULL_RTX, NULL_RTX,
340 body, pending_chain);
341 return pending_chain;
344 /* Use protect_from_queue to convert a QUEUED expression
345 into something that you can put immediately into an instruction.
346 If the queued incrementation has not happened yet,
347 protect_from_queue returns the variable itself.
348 If the incrementation has happened, protect_from_queue returns a temp
349 that contains a copy of the old value of the variable.
351 Any time an rtx which might possibly be a QUEUED is to be put
352 into an instruction, it must be passed through protect_from_queue first.
353 QUEUED expressions are not meaningful in instructions.
355 Do not pass a value through protect_from_queue and then hold
356 on to it for a while before putting it in an instruction!
357 If the queue is flushed in between, incorrect code will result. */
360 protect_from_queue (x, modify)
364 register RTX_CODE code = GET_CODE (x);
366 #if 0 /* A QUEUED can hang around after the queue is forced out. */
367 /* Shortcut for most common case. */
368 if (pending_chain == 0)
374 /* A special hack for read access to (MEM (QUEUED ...)) to facilitate
375 use of autoincrement. Make a copy of the contents of the memory
376 location rather than a copy of the address, but not if the value is
377 of mode BLKmode. Don't modify X in place since it might be
379 if (code == MEM && GET_MODE (x) != BLKmode
380 && GET_CODE (XEXP (x, 0)) == QUEUED && !modify)
382 register rtx y = XEXP (x, 0);
383 register rtx new = gen_rtx_MEM (GET_MODE (x), QUEUED_VAR (y));
385 RTX_UNCHANGING_P (new) = RTX_UNCHANGING_P (x);
386 MEM_COPY_ATTRIBUTES (new, x);
387 MEM_ALIAS_SET (new) = MEM_ALIAS_SET (x);
391 register rtx temp = gen_reg_rtx (GET_MODE (new));
392 emit_insn_before (gen_move_insn (temp, new),
398 /* Otherwise, recursively protect the subexpressions of all
399 the kinds of rtx's that can contain a QUEUED. */
402 rtx tem = protect_from_queue (XEXP (x, 0), 0);
403 if (tem != XEXP (x, 0))
409 else if (code == PLUS || code == MULT)
411 rtx new0 = protect_from_queue (XEXP (x, 0), 0);
412 rtx new1 = protect_from_queue (XEXP (x, 1), 0);
413 if (new0 != XEXP (x, 0) || new1 != XEXP (x, 1))
422 /* If the increment has not happened, use the variable itself. */
423 if (QUEUED_INSN (x) == 0)
424 return QUEUED_VAR (x);
425 /* If the increment has happened and a pre-increment copy exists,
427 if (QUEUED_COPY (x) != 0)
428 return QUEUED_COPY (x);
429 /* The increment has happened but we haven't set up a pre-increment copy.
430 Set one up now, and use it. */
431 QUEUED_COPY (x) = gen_reg_rtx (GET_MODE (QUEUED_VAR (x)));
432 emit_insn_before (gen_move_insn (QUEUED_COPY (x), QUEUED_VAR (x)),
434 return QUEUED_COPY (x);
437 /* Return nonzero if X contains a QUEUED expression:
438 if it contains anything that will be altered by a queued increment.
439 We handle only combinations of MEM, PLUS, MINUS and MULT operators
440 since memory addresses generally contain only those. */
446 register enum rtx_code code = GET_CODE (x);
452 return queued_subexp_p (XEXP (x, 0));
456 return (queued_subexp_p (XEXP (x, 0))
457 || queued_subexp_p (XEXP (x, 1)));
463 /* Perform all the pending incrementations. */
469 while ((p = pending_chain))
471 rtx body = QUEUED_BODY (p);
473 if (GET_CODE (body) == SEQUENCE)
475 QUEUED_INSN (p) = XVECEXP (QUEUED_BODY (p), 0, 0);
476 emit_insn (QUEUED_BODY (p));
479 QUEUED_INSN (p) = emit_insn (QUEUED_BODY (p));
480 pending_chain = QUEUED_NEXT (p);
484 /* Copy data from FROM to TO, where the machine modes are not the same.
485 Both modes may be integer, or both may be floating.
486 UNSIGNEDP should be nonzero if FROM is an unsigned type.
487 This causes zero-extension instead of sign-extension. */
490 convert_move (to, from, unsignedp)
491 register rtx to, from;
494 enum machine_mode to_mode = GET_MODE (to);
495 enum machine_mode from_mode = GET_MODE (from);
496 int to_real = GET_MODE_CLASS (to_mode) == MODE_FLOAT;
497 int from_real = GET_MODE_CLASS (from_mode) == MODE_FLOAT;
501 /* rtx code for making an equivalent value. */
502 enum rtx_code equiv_code = (unsignedp ? ZERO_EXTEND : SIGN_EXTEND);
504 to = protect_from_queue (to, 1);
505 from = protect_from_queue (from, 0);
507 if (to_real != from_real)
510 /* If FROM is a SUBREG that indicates that we have already done at least
511 the required extension, strip it. We don't handle such SUBREGs as
514 if (GET_CODE (from) == SUBREG && SUBREG_PROMOTED_VAR_P (from)
515 && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (from)))
516 >= GET_MODE_SIZE (to_mode))
517 && SUBREG_PROMOTED_UNSIGNED_P (from) == unsignedp)
518 from = gen_lowpart (to_mode, from), from_mode = to_mode;
520 if (GET_CODE (to) == SUBREG && SUBREG_PROMOTED_VAR_P (to))
523 if (to_mode == from_mode
524 || (from_mode == VOIDmode && CONSTANT_P (from)))
526 emit_move_insn (to, from);
534 if (GET_MODE_BITSIZE (from_mode) < GET_MODE_BITSIZE (to_mode))
536 /* Try converting directly if the insn is supported. */
537 if ((code = can_extend_p (to_mode, from_mode, 0))
540 emit_unop_insn (code, to, from, UNKNOWN);
545 #ifdef HAVE_trunchfqf2
546 if (HAVE_trunchfqf2 && from_mode == HFmode && to_mode == QFmode)
548 emit_unop_insn (CODE_FOR_trunchfqf2, to, from, UNKNOWN);
552 #ifdef HAVE_trunctqfqf2
553 if (HAVE_trunctqfqf2 && from_mode == TQFmode && to_mode == QFmode)
555 emit_unop_insn (CODE_FOR_trunctqfqf2, to, from, UNKNOWN);
559 #ifdef HAVE_truncsfqf2
560 if (HAVE_truncsfqf2 && from_mode == SFmode && to_mode == QFmode)
562 emit_unop_insn (CODE_FOR_truncsfqf2, to, from, UNKNOWN);
566 #ifdef HAVE_truncdfqf2
567 if (HAVE_truncdfqf2 && from_mode == DFmode && to_mode == QFmode)
569 emit_unop_insn (CODE_FOR_truncdfqf2, to, from, UNKNOWN);
573 #ifdef HAVE_truncxfqf2
574 if (HAVE_truncxfqf2 && from_mode == XFmode && to_mode == QFmode)
576 emit_unop_insn (CODE_FOR_truncxfqf2, to, from, UNKNOWN);
580 #ifdef HAVE_trunctfqf2
581 if (HAVE_trunctfqf2 && from_mode == TFmode && to_mode == QFmode)
583 emit_unop_insn (CODE_FOR_trunctfqf2, to, from, UNKNOWN);
588 #ifdef HAVE_trunctqfhf2
589 if (HAVE_trunctqfhf2 && from_mode == TQFmode && to_mode == HFmode)
591 emit_unop_insn (CODE_FOR_trunctqfhf2, to, from, UNKNOWN);
595 #ifdef HAVE_truncsfhf2
596 if (HAVE_truncsfhf2 && from_mode == SFmode && to_mode == HFmode)
598 emit_unop_insn (CODE_FOR_truncsfhf2, to, from, UNKNOWN);
602 #ifdef HAVE_truncdfhf2
603 if (HAVE_truncdfhf2 && from_mode == DFmode && to_mode == HFmode)
605 emit_unop_insn (CODE_FOR_truncdfhf2, to, from, UNKNOWN);
609 #ifdef HAVE_truncxfhf2
610 if (HAVE_truncxfhf2 && from_mode == XFmode && to_mode == HFmode)
612 emit_unop_insn (CODE_FOR_truncxfhf2, to, from, UNKNOWN);
616 #ifdef HAVE_trunctfhf2
617 if (HAVE_trunctfhf2 && from_mode == TFmode && to_mode == HFmode)
619 emit_unop_insn (CODE_FOR_trunctfhf2, to, from, UNKNOWN);
624 #ifdef HAVE_truncsftqf2
625 if (HAVE_truncsftqf2 && from_mode == SFmode && to_mode == TQFmode)
627 emit_unop_insn (CODE_FOR_truncsftqf2, to, from, UNKNOWN);
631 #ifdef HAVE_truncdftqf2
632 if (HAVE_truncdftqf2 && from_mode == DFmode && to_mode == TQFmode)
634 emit_unop_insn (CODE_FOR_truncdftqf2, to, from, UNKNOWN);
638 #ifdef HAVE_truncxftqf2
639 if (HAVE_truncxftqf2 && from_mode == XFmode && to_mode == TQFmode)
641 emit_unop_insn (CODE_FOR_truncxftqf2, to, from, UNKNOWN);
645 #ifdef HAVE_trunctftqf2
646 if (HAVE_trunctftqf2 && from_mode == TFmode && to_mode == TQFmode)
648 emit_unop_insn (CODE_FOR_trunctftqf2, to, from, UNKNOWN);
653 #ifdef HAVE_truncdfsf2
654 if (HAVE_truncdfsf2 && from_mode == DFmode && to_mode == SFmode)
656 emit_unop_insn (CODE_FOR_truncdfsf2, to, from, UNKNOWN);
660 #ifdef HAVE_truncxfsf2
661 if (HAVE_truncxfsf2 && from_mode == XFmode && to_mode == SFmode)
663 emit_unop_insn (CODE_FOR_truncxfsf2, to, from, UNKNOWN);
667 #ifdef HAVE_trunctfsf2
668 if (HAVE_trunctfsf2 && from_mode == TFmode && to_mode == SFmode)
670 emit_unop_insn (CODE_FOR_trunctfsf2, to, from, UNKNOWN);
674 #ifdef HAVE_truncxfdf2
675 if (HAVE_truncxfdf2 && from_mode == XFmode && to_mode == DFmode)
677 emit_unop_insn (CODE_FOR_truncxfdf2, to, from, UNKNOWN);
681 #ifdef HAVE_trunctfdf2
682 if (HAVE_trunctfdf2 && from_mode == TFmode && to_mode == DFmode)
684 emit_unop_insn (CODE_FOR_trunctfdf2, to, from, UNKNOWN);
696 libcall = extendsfdf2_libfunc;
700 libcall = extendsfxf2_libfunc;
704 libcall = extendsftf2_libfunc;
716 libcall = truncdfsf2_libfunc;
720 libcall = extenddfxf2_libfunc;
724 libcall = extenddftf2_libfunc;
736 libcall = truncxfsf2_libfunc;
740 libcall = truncxfdf2_libfunc;
752 libcall = trunctfsf2_libfunc;
756 libcall = trunctfdf2_libfunc;
768 if (libcall == (rtx) 0)
769 /* This conversion is not implemented yet. */
772 value = emit_library_call_value (libcall, NULL_RTX, 1, to_mode,
774 emit_move_insn (to, value);
778 /* Now both modes are integers. */
780 /* Handle expanding beyond a word. */
781 if (GET_MODE_BITSIZE (from_mode) < GET_MODE_BITSIZE (to_mode)
782 && GET_MODE_BITSIZE (to_mode) > BITS_PER_WORD)
789 enum machine_mode lowpart_mode;
790 int nwords = CEIL (GET_MODE_SIZE (to_mode), UNITS_PER_WORD);
792 /* Try converting directly if the insn is supported. */
793 if ((code = can_extend_p (to_mode, from_mode, unsignedp))
796 /* If FROM is a SUBREG, put it into a register. Do this
797 so that we always generate the same set of insns for
798 better cse'ing; if an intermediate assignment occurred,
799 we won't be doing the operation directly on the SUBREG. */
800 if (optimize > 0 && GET_CODE (from) == SUBREG)
801 from = force_reg (from_mode, from);
802 emit_unop_insn (code, to, from, equiv_code);
805 /* Next, try converting via full word. */
806 else if (GET_MODE_BITSIZE (from_mode) < BITS_PER_WORD
807 && ((code = can_extend_p (to_mode, word_mode, unsignedp))
808 != CODE_FOR_nothing))
810 if (GET_CODE (to) == REG)
811 emit_insn (gen_rtx_CLOBBER (VOIDmode, to));
812 convert_move (gen_lowpart (word_mode, to), from, unsignedp);
813 emit_unop_insn (code, to,
814 gen_lowpart (word_mode, to), equiv_code);
818 /* No special multiword conversion insn; do it by hand. */
821 /* Since we will turn this into a no conflict block, we must ensure
822 that the source does not overlap the target. */
824 if (reg_overlap_mentioned_p (to, from))
825 from = force_reg (from_mode, from);
827 /* Get a copy of FROM widened to a word, if necessary. */
828 if (GET_MODE_BITSIZE (from_mode) < BITS_PER_WORD)
829 lowpart_mode = word_mode;
831 lowpart_mode = from_mode;
833 lowfrom = convert_to_mode (lowpart_mode, from, unsignedp);
835 lowpart = gen_lowpart (lowpart_mode, to);
836 emit_move_insn (lowpart, lowfrom);
838 /* Compute the value to put in each remaining word. */
840 fill_value = const0_rtx;
845 && insn_data[(int) CODE_FOR_slt].operand[0].mode == word_mode
846 && STORE_FLAG_VALUE == -1)
848 emit_cmp_insn (lowfrom, const0_rtx, NE, NULL_RTX,
850 fill_value = gen_reg_rtx (word_mode);
851 emit_insn (gen_slt (fill_value));
857 = expand_shift (RSHIFT_EXPR, lowpart_mode, lowfrom,
858 size_int (GET_MODE_BITSIZE (lowpart_mode) - 1),
860 fill_value = convert_to_mode (word_mode, fill_value, 1);
864 /* Fill the remaining words. */
865 for (i = GET_MODE_SIZE (lowpart_mode) / UNITS_PER_WORD; i < nwords; i++)
867 int index = (WORDS_BIG_ENDIAN ? nwords - i - 1 : i);
868 rtx subword = operand_subword (to, index, 1, to_mode);
873 if (fill_value != subword)
874 emit_move_insn (subword, fill_value);
877 insns = get_insns ();
880 emit_no_conflict_block (insns, to, from, NULL_RTX,
881 gen_rtx_fmt_e (equiv_code, to_mode, copy_rtx (from)));
885 /* Truncating multi-word to a word or less. */
886 if (GET_MODE_BITSIZE (from_mode) > BITS_PER_WORD
887 && GET_MODE_BITSIZE (to_mode) <= BITS_PER_WORD)
889 if (!((GET_CODE (from) == MEM
890 && ! MEM_VOLATILE_P (from)
891 && direct_load[(int) to_mode]
892 && ! mode_dependent_address_p (XEXP (from, 0)))
893 || GET_CODE (from) == REG
894 || GET_CODE (from) == SUBREG))
895 from = force_reg (from_mode, from);
896 convert_move (to, gen_lowpart (word_mode, from), 0);
900 /* Handle pointer conversion */ /* SPEE 900220 */
901 if (to_mode == PQImode)
903 if (from_mode != QImode)
904 from = convert_to_mode (QImode, from, unsignedp);
906 #ifdef HAVE_truncqipqi2
907 if (HAVE_truncqipqi2)
909 emit_unop_insn (CODE_FOR_truncqipqi2, to, from, UNKNOWN);
912 #endif /* HAVE_truncqipqi2 */
916 if (from_mode == PQImode)
918 if (to_mode != QImode)
920 from = convert_to_mode (QImode, from, unsignedp);
925 #ifdef HAVE_extendpqiqi2
926 if (HAVE_extendpqiqi2)
928 emit_unop_insn (CODE_FOR_extendpqiqi2, to, from, UNKNOWN);
931 #endif /* HAVE_extendpqiqi2 */
936 if (to_mode == PSImode)
938 if (from_mode != SImode)
939 from = convert_to_mode (SImode, from, unsignedp);
941 #ifdef HAVE_truncsipsi2
942 if (HAVE_truncsipsi2)
944 emit_unop_insn (CODE_FOR_truncsipsi2, to, from, UNKNOWN);
947 #endif /* HAVE_truncsipsi2 */
951 if (from_mode == PSImode)
953 if (to_mode != SImode)
955 from = convert_to_mode (SImode, from, unsignedp);
960 #ifdef HAVE_extendpsisi2
961 if (HAVE_extendpsisi2)
963 emit_unop_insn (CODE_FOR_extendpsisi2, to, from, UNKNOWN);
966 #endif /* HAVE_extendpsisi2 */
971 if (to_mode == PDImode)
973 if (from_mode != DImode)
974 from = convert_to_mode (DImode, from, unsignedp);
976 #ifdef HAVE_truncdipdi2
977 if (HAVE_truncdipdi2)
979 emit_unop_insn (CODE_FOR_truncdipdi2, to, from, UNKNOWN);
982 #endif /* HAVE_truncdipdi2 */
986 if (from_mode == PDImode)
988 if (to_mode != DImode)
990 from = convert_to_mode (DImode, from, unsignedp);
995 #ifdef HAVE_extendpdidi2
996 if (HAVE_extendpdidi2)
998 emit_unop_insn (CODE_FOR_extendpdidi2, to, from, UNKNOWN);
1001 #endif /* HAVE_extendpdidi2 */
1006 /* Now follow all the conversions between integers
1007 no more than a word long. */
1009 /* For truncation, usually we can just refer to FROM in a narrower mode. */
1010 if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode)
1011 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (to_mode),
1012 GET_MODE_BITSIZE (from_mode)))
1014 if (!((GET_CODE (from) == MEM
1015 && ! MEM_VOLATILE_P (from)
1016 && direct_load[(int) to_mode]
1017 && ! mode_dependent_address_p (XEXP (from, 0)))
1018 || GET_CODE (from) == REG
1019 || GET_CODE (from) == SUBREG))
1020 from = force_reg (from_mode, from);
1021 if (GET_CODE (from) == REG && REGNO (from) < FIRST_PSEUDO_REGISTER
1022 && ! HARD_REGNO_MODE_OK (REGNO (from), to_mode))
1023 from = copy_to_reg (from);
1024 emit_move_insn (to, gen_lowpart (to_mode, from));
1028 /* Handle extension. */
1029 if (GET_MODE_BITSIZE (to_mode) > GET_MODE_BITSIZE (from_mode))
1031 /* Convert directly if that works. */
1032 if ((code = can_extend_p (to_mode, from_mode, unsignedp))
1033 != CODE_FOR_nothing)
1035 emit_unop_insn (code, to, from, equiv_code);
1040 enum machine_mode intermediate;
1044 /* Search for a mode to convert via. */
1045 for (intermediate = from_mode; intermediate != VOIDmode;
1046 intermediate = GET_MODE_WIDER_MODE (intermediate))
1047 if (((can_extend_p (to_mode, intermediate, unsignedp)
1048 != CODE_FOR_nothing)
1049 || (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (intermediate)
1050 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (to_mode),
1051 GET_MODE_BITSIZE (intermediate))))
1052 && (can_extend_p (intermediate, from_mode, unsignedp)
1053 != CODE_FOR_nothing))
1055 convert_move (to, convert_to_mode (intermediate, from,
1056 unsignedp), unsignedp);
1060 /* No suitable intermediate mode.
1061 Generate what we need with shifts. */
1062 shift_amount = build_int_2 (GET_MODE_BITSIZE (to_mode)
1063 - GET_MODE_BITSIZE (from_mode), 0);
1064 from = gen_lowpart (to_mode, force_reg (from_mode, from));
1065 tmp = expand_shift (LSHIFT_EXPR, to_mode, from, shift_amount,
1067 tmp = expand_shift (RSHIFT_EXPR, to_mode, tmp, shift_amount,
1070 emit_move_insn (to, tmp);
1075 /* Support special truncate insns for certain modes. */
1077 if (from_mode == DImode && to_mode == SImode)
1079 #ifdef HAVE_truncdisi2
1080 if (HAVE_truncdisi2)
1082 emit_unop_insn (CODE_FOR_truncdisi2, to, from, UNKNOWN);
1086 convert_move (to, force_reg (from_mode, from), unsignedp);
1090 if (from_mode == DImode && to_mode == HImode)
1092 #ifdef HAVE_truncdihi2
1093 if (HAVE_truncdihi2)
1095 emit_unop_insn (CODE_FOR_truncdihi2, to, from, UNKNOWN);
1099 convert_move (to, force_reg (from_mode, from), unsignedp);
1103 if (from_mode == DImode && to_mode == QImode)
1105 #ifdef HAVE_truncdiqi2
1106 if (HAVE_truncdiqi2)
1108 emit_unop_insn (CODE_FOR_truncdiqi2, to, from, UNKNOWN);
1112 convert_move (to, force_reg (from_mode, from), unsignedp);
1116 if (from_mode == SImode && to_mode == HImode)
1118 #ifdef HAVE_truncsihi2
1119 if (HAVE_truncsihi2)
1121 emit_unop_insn (CODE_FOR_truncsihi2, to, from, UNKNOWN);
1125 convert_move (to, force_reg (from_mode, from), unsignedp);
1129 if (from_mode == SImode && to_mode == QImode)
1131 #ifdef HAVE_truncsiqi2
1132 if (HAVE_truncsiqi2)
1134 emit_unop_insn (CODE_FOR_truncsiqi2, to, from, UNKNOWN);
1138 convert_move (to, force_reg (from_mode, from), unsignedp);
1142 if (from_mode == HImode && to_mode == QImode)
1144 #ifdef HAVE_trunchiqi2
1145 if (HAVE_trunchiqi2)
1147 emit_unop_insn (CODE_FOR_trunchiqi2, to, from, UNKNOWN);
1151 convert_move (to, force_reg (from_mode, from), unsignedp);
1155 if (from_mode == TImode && to_mode == DImode)
1157 #ifdef HAVE_trunctidi2
1158 if (HAVE_trunctidi2)
1160 emit_unop_insn (CODE_FOR_trunctidi2, to, from, UNKNOWN);
1164 convert_move (to, force_reg (from_mode, from), unsignedp);
1168 if (from_mode == TImode && to_mode == SImode)
1170 #ifdef HAVE_trunctisi2
1171 if (HAVE_trunctisi2)
1173 emit_unop_insn (CODE_FOR_trunctisi2, to, from, UNKNOWN);
1177 convert_move (to, force_reg (from_mode, from), unsignedp);
1181 if (from_mode == TImode && to_mode == HImode)
1183 #ifdef HAVE_trunctihi2
1184 if (HAVE_trunctihi2)
1186 emit_unop_insn (CODE_FOR_trunctihi2, to, from, UNKNOWN);
1190 convert_move (to, force_reg (from_mode, from), unsignedp);
1194 if (from_mode == TImode && to_mode == QImode)
1196 #ifdef HAVE_trunctiqi2
1197 if (HAVE_trunctiqi2)
1199 emit_unop_insn (CODE_FOR_trunctiqi2, to, from, UNKNOWN);
1203 convert_move (to, force_reg (from_mode, from), unsignedp);
1207 /* Handle truncation of volatile memrefs, and so on;
1208 the things that couldn't be truncated directly,
1209 and for which there was no special instruction. */
1210 if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode))
1212 rtx temp = force_reg (to_mode, gen_lowpart (to_mode, from));
1213 emit_move_insn (to, temp);
1217 /* Mode combination is not recognized. */
1221 /* Return an rtx for a value that would result
1222 from converting X to mode MODE.
1223 Both X and MODE may be floating, or both integer.
1224 UNSIGNEDP is nonzero if X is an unsigned value.
1225 This can be done by referring to a part of X in place
1226 or by copying to a new temporary with conversion.
1228 This function *must not* call protect_from_queue
1229 except when putting X into an insn (in which case convert_move does it). */
1232 convert_to_mode (mode, x, unsignedp)
1233 enum machine_mode mode;
1237 return convert_modes (mode, VOIDmode, x, unsignedp);
1240 /* Return an rtx for a value that would result
1241 from converting X from mode OLDMODE to mode MODE.
1242 Both modes may be floating, or both integer.
1243 UNSIGNEDP is nonzero if X is an unsigned value.
1245 This can be done by referring to a part of X in place
1246 or by copying to a new temporary with conversion.
1248 You can give VOIDmode for OLDMODE, if you are sure X has a nonvoid mode.
1250 This function *must not* call protect_from_queue
1251 except when putting X into an insn (in which case convert_move does it). */
1254 convert_modes (mode, oldmode, x, unsignedp)
1255 enum machine_mode mode, oldmode;
1261 /* If FROM is a SUBREG that indicates that we have already done at least
1262 the required extension, strip it. */
1264 if (GET_CODE (x) == SUBREG && SUBREG_PROMOTED_VAR_P (x)
1265 && GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) >= GET_MODE_SIZE (mode)
1266 && SUBREG_PROMOTED_UNSIGNED_P (x) == unsignedp)
1267 x = gen_lowpart (mode, x);
1269 if (GET_MODE (x) != VOIDmode)
1270 oldmode = GET_MODE (x);
1272 if (mode == oldmode)
1275 /* There is one case that we must handle specially: If we are converting
1276 a CONST_INT into a mode whose size is twice HOST_BITS_PER_WIDE_INT and
1277 we are to interpret the constant as unsigned, gen_lowpart will do
1278 the wrong if the constant appears negative. What we want to do is
1279 make the high-order word of the constant zero, not all ones. */
1281 if (unsignedp && GET_MODE_CLASS (mode) == MODE_INT
1282 && GET_MODE_BITSIZE (mode) == 2 * HOST_BITS_PER_WIDE_INT
1283 && GET_CODE (x) == CONST_INT && INTVAL (x) < 0)
1285 HOST_WIDE_INT val = INTVAL (x);
1287 if (oldmode != VOIDmode
1288 && HOST_BITS_PER_WIDE_INT > GET_MODE_BITSIZE (oldmode))
1290 int width = GET_MODE_BITSIZE (oldmode);
1292 /* We need to zero extend VAL. */
1293 val &= ((HOST_WIDE_INT) 1 << width) - 1;
1296 return immed_double_const (val, (HOST_WIDE_INT) 0, mode);
1299 /* We can do this with a gen_lowpart if both desired and current modes
1300 are integer, and this is either a constant integer, a register, or a
1301 non-volatile MEM. Except for the constant case where MODE is no
1302 wider than HOST_BITS_PER_WIDE_INT, we must be narrowing the operand. */
1304 if ((GET_CODE (x) == CONST_INT
1305 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
1306 || (GET_MODE_CLASS (mode) == MODE_INT
1307 && GET_MODE_CLASS (oldmode) == MODE_INT
1308 && (GET_CODE (x) == CONST_DOUBLE
1309 || (GET_MODE_SIZE (mode) <= GET_MODE_SIZE (oldmode)
1310 && ((GET_CODE (x) == MEM && ! MEM_VOLATILE_P (x)
1311 && direct_load[(int) mode])
1312 || (GET_CODE (x) == REG
1313 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
1314 GET_MODE_BITSIZE (GET_MODE (x)))))))))
1316 /* ?? If we don't know OLDMODE, we have to assume here that
1317 X does not need sign- or zero-extension. This may not be
1318 the case, but it's the best we can do. */
1319 if (GET_CODE (x) == CONST_INT && oldmode != VOIDmode
1320 && GET_MODE_SIZE (mode) > GET_MODE_SIZE (oldmode))
1322 HOST_WIDE_INT val = INTVAL (x);
1323 int width = GET_MODE_BITSIZE (oldmode);
1325 /* We must sign or zero-extend in this case. Start by
1326 zero-extending, then sign extend if we need to. */
1327 val &= ((HOST_WIDE_INT) 1 << width) - 1;
1329 && (val & ((HOST_WIDE_INT) 1 << (width - 1))))
1330 val |= (HOST_WIDE_INT) (-1) << width;
1332 return GEN_INT (val);
1335 return gen_lowpart (mode, x);
1338 temp = gen_reg_rtx (mode);
1339 convert_move (temp, x, unsignedp);
1344 /* This macro is used to determine what the largest unit size that
1345 move_by_pieces can use is. */
1347 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
1348 move efficiently, as opposed to MOVE_MAX which is the maximum
1349 number of bhytes we can move with a single instruction. */
1351 #ifndef MOVE_MAX_PIECES
1352 #define MOVE_MAX_PIECES MOVE_MAX
1355 /* Generate several move instructions to copy LEN bytes
1356 from block FROM to block TO. (These are MEM rtx's with BLKmode).
1357 The caller must pass FROM and TO
1358 through protect_from_queue before calling.
1359 ALIGN (in bytes) is maximum alignment we can assume. */
1362 move_by_pieces (to, from, len, align)
1367 struct move_by_pieces data;
1368 rtx to_addr = XEXP (to, 0), from_addr = XEXP (from, 0);
1369 int max_size = MOVE_MAX_PIECES + 1;
1370 enum machine_mode mode = VOIDmode, tmode;
1371 enum insn_code icode;
1374 data.to_addr = to_addr;
1375 data.from_addr = from_addr;
1379 = (GET_CODE (to_addr) == PRE_INC || GET_CODE (to_addr) == PRE_DEC
1380 || GET_CODE (to_addr) == POST_INC || GET_CODE (to_addr) == POST_DEC);
1382 = (GET_CODE (from_addr) == PRE_INC || GET_CODE (from_addr) == PRE_DEC
1383 || GET_CODE (from_addr) == POST_INC
1384 || GET_CODE (from_addr) == POST_DEC);
1386 data.explicit_inc_from = 0;
1387 data.explicit_inc_to = 0;
1389 = (GET_CODE (to_addr) == PRE_DEC || GET_CODE (to_addr) == POST_DEC);
1390 if (data.reverse) data.offset = len;
1393 data.to_struct = MEM_IN_STRUCT_P (to);
1394 data.from_struct = MEM_IN_STRUCT_P (from);
1395 data.to_readonly = RTX_UNCHANGING_P (to);
1396 data.from_readonly = RTX_UNCHANGING_P (from);
1398 /* If copying requires more than two move insns,
1399 copy addresses to registers (to make displacements shorter)
1400 and use post-increment if available. */
1401 if (!(data.autinc_from && data.autinc_to)
1402 && move_by_pieces_ninsns (len, align) > 2)
1404 /* Find the mode of the largest move... */
1405 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1406 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
1407 if (GET_MODE_SIZE (tmode) < max_size)
1410 if (USE_LOAD_PRE_DECREMENT (mode) && data.reverse && ! data.autinc_from)
1412 data.from_addr = copy_addr_to_reg (plus_constant (from_addr, len));
1413 data.autinc_from = 1;
1414 data.explicit_inc_from = -1;
1416 if (USE_LOAD_POST_INCREMENT (mode) && ! data.autinc_from)
1418 data.from_addr = copy_addr_to_reg (from_addr);
1419 data.autinc_from = 1;
1420 data.explicit_inc_from = 1;
1422 if (!data.autinc_from && CONSTANT_P (from_addr))
1423 data.from_addr = copy_addr_to_reg (from_addr);
1424 if (USE_STORE_PRE_DECREMENT (mode) && data.reverse && ! data.autinc_to)
1426 data.to_addr = copy_addr_to_reg (plus_constant (to_addr, len));
1428 data.explicit_inc_to = -1;
1430 if (USE_STORE_POST_INCREMENT (mode) && ! data.reverse && ! data.autinc_to)
1432 data.to_addr = copy_addr_to_reg (to_addr);
1434 data.explicit_inc_to = 1;
1436 if (!data.autinc_to && CONSTANT_P (to_addr))
1437 data.to_addr = copy_addr_to_reg (to_addr);
1440 if (! SLOW_UNALIGNED_ACCESS (word_mode, align)
1441 || align > MOVE_MAX || align >= BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1444 /* First move what we can in the largest integer mode, then go to
1445 successively smaller modes. */
1447 while (max_size > 1)
1449 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1450 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
1451 if (GET_MODE_SIZE (tmode) < max_size)
1454 if (mode == VOIDmode)
1457 icode = mov_optab->handlers[(int) mode].insn_code;
1458 if (icode != CODE_FOR_nothing
1459 && align >= MIN (BIGGEST_ALIGNMENT / BITS_PER_UNIT,
1460 (unsigned int) GET_MODE_SIZE (mode)))
1461 move_by_pieces_1 (GEN_FCN (icode), mode, &data);
1463 max_size = GET_MODE_SIZE (mode);
1466 /* The code above should have handled everything. */
1471 /* Return number of insns required to move L bytes by pieces.
1472 ALIGN (in bytes) is maximum alignment we can assume. */
1475 move_by_pieces_ninsns (l, align)
1479 register int n_insns = 0;
1480 int max_size = MOVE_MAX + 1;
1482 if (! SLOW_UNALIGNED_ACCESS (word_mode, align)
1483 || align > MOVE_MAX || align >= BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1486 while (max_size > 1)
1488 enum machine_mode mode = VOIDmode, tmode;
1489 enum insn_code icode;
1491 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1492 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
1493 if (GET_MODE_SIZE (tmode) < max_size)
1496 if (mode == VOIDmode)
1499 icode = mov_optab->handlers[(int) mode].insn_code;
1500 if (icode != CODE_FOR_nothing
1501 && align >= GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT)
1502 n_insns += l / GET_MODE_SIZE (mode), l %= GET_MODE_SIZE (mode);
1504 max_size = GET_MODE_SIZE (mode);
1510 /* Subroutine of move_by_pieces. Move as many bytes as appropriate
1511 with move instructions for mode MODE. GENFUN is the gen_... function
1512 to make a move insn for that mode. DATA has all the other info. */
1515 move_by_pieces_1 (genfun, mode, data)
1516 rtx (*genfun) PARAMS ((rtx, ...));
1517 enum machine_mode mode;
1518 struct move_by_pieces *data;
1520 register int size = GET_MODE_SIZE (mode);
1521 register rtx to1, from1;
1523 while (data->len >= size)
1525 if (data->reverse) data->offset -= size;
1527 to1 = (data->autinc_to
1528 ? gen_rtx_MEM (mode, data->to_addr)
1529 : copy_rtx (change_address (data->to, mode,
1530 plus_constant (data->to_addr,
1532 MEM_IN_STRUCT_P (to1) = data->to_struct;
1533 RTX_UNCHANGING_P (to1) = data->to_readonly;
1536 = (data->autinc_from
1537 ? gen_rtx_MEM (mode, data->from_addr)
1538 : copy_rtx (change_address (data->from, mode,
1539 plus_constant (data->from_addr,
1541 MEM_IN_STRUCT_P (from1) = data->from_struct;
1542 RTX_UNCHANGING_P (from1) = data->from_readonly;
1544 if (HAVE_PRE_DECREMENT && data->explicit_inc_to < 0)
1545 emit_insn (gen_add2_insn (data->to_addr, GEN_INT (-size)));
1546 if (HAVE_PRE_DECREMENT && data->explicit_inc_from < 0)
1547 emit_insn (gen_add2_insn (data->from_addr, GEN_INT (-size)));
1549 emit_insn ((*genfun) (to1, from1));
1550 if (HAVE_POST_INCREMENT && data->explicit_inc_to > 0)
1551 emit_insn (gen_add2_insn (data->to_addr, GEN_INT (size)));
1552 if (HAVE_POST_INCREMENT && data->explicit_inc_from > 0)
1553 emit_insn (gen_add2_insn (data->from_addr, GEN_INT (size)));
1555 if (! data->reverse) data->offset += size;
1561 /* Emit code to move a block Y to a block X.
1562 This may be done with string-move instructions,
1563 with multiple scalar move instructions, or with a library call.
1565 Both X and Y must be MEM rtx's (perhaps inside VOLATILE)
1567 SIZE is an rtx that says how long they are.
1568 ALIGN is the maximum alignment we can assume they have,
1571 Return the address of the new block, if memcpy is called and returns it,
1575 emit_block_move (x, y, size, align)
1581 #ifdef TARGET_MEM_FUNCTIONS
1583 tree call_expr, arg_list;
1586 if (GET_MODE (x) != BLKmode)
1589 if (GET_MODE (y) != BLKmode)
1592 x = protect_from_queue (x, 1);
1593 y = protect_from_queue (y, 0);
1594 size = protect_from_queue (size, 0);
1596 if (GET_CODE (x) != MEM)
1598 if (GET_CODE (y) != MEM)
1603 if (GET_CODE (size) == CONST_INT && MOVE_BY_PIECES_P (INTVAL (size), align))
1604 move_by_pieces (x, y, INTVAL (size), align);
1607 /* Try the most limited insn first, because there's no point
1608 including more than one in the machine description unless
1609 the more limited one has some advantage. */
1611 rtx opalign = GEN_INT (align);
1612 enum machine_mode mode;
1614 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
1615 mode = GET_MODE_WIDER_MODE (mode))
1617 enum insn_code code = movstr_optab[(int) mode];
1618 insn_operand_predicate_fn pred;
1620 if (code != CODE_FOR_nothing
1621 /* We don't need MODE to be narrower than BITS_PER_HOST_WIDE_INT
1622 here because if SIZE is less than the mode mask, as it is
1623 returned by the macro, it will definitely be less than the
1624 actual mode mask. */
1625 && ((GET_CODE (size) == CONST_INT
1626 && ((unsigned HOST_WIDE_INT) INTVAL (size)
1627 <= (GET_MODE_MASK (mode) >> 1)))
1628 || GET_MODE_BITSIZE (mode) >= BITS_PER_WORD)
1629 && ((pred = insn_data[(int) code].operand[0].predicate) == 0
1630 || (*pred) (x, BLKmode))
1631 && ((pred = insn_data[(int) code].operand[1].predicate) == 0
1632 || (*pred) (y, BLKmode))
1633 && ((pred = insn_data[(int) code].operand[3].predicate) == 0
1634 || (*pred) (opalign, VOIDmode)))
1637 rtx last = get_last_insn ();
1640 op2 = convert_to_mode (mode, size, 1);
1641 pred = insn_data[(int) code].operand[2].predicate;
1642 if (pred != 0 && ! (*pred) (op2, mode))
1643 op2 = copy_to_mode_reg (mode, op2);
1645 pat = GEN_FCN ((int) code) (x, y, op2, opalign);
1652 delete_insns_since (last);
1656 /* X, Y, or SIZE may have been passed through protect_from_queue.
1658 It is unsafe to save the value generated by protect_from_queue
1659 and reuse it later. Consider what happens if emit_queue is
1660 called before the return value from protect_from_queue is used.
1662 Expansion of the CALL_EXPR below will call emit_queue before
1663 we are finished emitting RTL for argument setup. So if we are
1664 not careful we could get the wrong value for an argument.
1666 To avoid this problem we go ahead and emit code to copy X, Y &
1667 SIZE into new pseudos. We can then place those new pseudos
1668 into an RTL_EXPR and use them later, even after a call to
1671 Note this is not strictly needed for library calls since they
1672 do not call emit_queue before loading their arguments. However,
1673 we may need to have library calls call emit_queue in the future
1674 since failing to do so could cause problems for targets which
1675 define SMALL_REGISTER_CLASSES and pass arguments in registers. */
1676 x = copy_to_mode_reg (Pmode, XEXP (x, 0));
1677 y = copy_to_mode_reg (Pmode, XEXP (y, 0));
1679 #ifdef TARGET_MEM_FUNCTIONS
1680 size = copy_to_mode_reg (TYPE_MODE (sizetype), size);
1682 size = convert_to_mode (TYPE_MODE (integer_type_node), size,
1683 TREE_UNSIGNED (integer_type_node));
1684 size = copy_to_mode_reg (TYPE_MODE (integer_type_node), size);
1687 #ifdef TARGET_MEM_FUNCTIONS
1688 /* It is incorrect to use the libcall calling conventions to call
1689 memcpy in this context.
1691 This could be a user call to memcpy and the user may wish to
1692 examine the return value from memcpy.
1694 For targets where libcalls and normal calls have different conventions
1695 for returning pointers, we could end up generating incorrect code.
1697 So instead of using a libcall sequence we build up a suitable
1698 CALL_EXPR and expand the call in the normal fashion. */
1699 if (fn == NULL_TREE)
1703 /* This was copied from except.c, I don't know if all this is
1704 necessary in this context or not. */
1705 fn = get_identifier ("memcpy");
1706 push_obstacks_nochange ();
1707 end_temporary_allocation ();
1708 fntype = build_pointer_type (void_type_node);
1709 fntype = build_function_type (fntype, NULL_TREE);
1710 fn = build_decl (FUNCTION_DECL, fn, fntype);
1711 ggc_add_tree_root (&fn, 1);
1712 DECL_EXTERNAL (fn) = 1;
1713 TREE_PUBLIC (fn) = 1;
1714 DECL_ARTIFICIAL (fn) = 1;
1715 make_decl_rtl (fn, NULL_PTR, 1);
1716 assemble_external (fn);
1720 /* We need to make an argument list for the function call.
1722 memcpy has three arguments, the first two are void * addresses and
1723 the last is a size_t byte count for the copy. */
1725 = build_tree_list (NULL_TREE,
1726 make_tree (build_pointer_type (void_type_node), x));
1727 TREE_CHAIN (arg_list)
1728 = build_tree_list (NULL_TREE,
1729 make_tree (build_pointer_type (void_type_node), y));
1730 TREE_CHAIN (TREE_CHAIN (arg_list))
1731 = build_tree_list (NULL_TREE, make_tree (sizetype, size));
1732 TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (arg_list))) = NULL_TREE;
1734 /* Now we have to build up the CALL_EXPR itself. */
1735 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
1736 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
1737 call_expr, arg_list, NULL_TREE);
1738 TREE_SIDE_EFFECTS (call_expr) = 1;
1740 retval = expand_expr (call_expr, NULL_RTX, VOIDmode, 0);
1742 emit_library_call (bcopy_libfunc, 0,
1743 VOIDmode, 3, y, Pmode, x, Pmode,
1744 convert_to_mode (TYPE_MODE (integer_type_node), size,
1745 TREE_UNSIGNED (integer_type_node)),
1746 TYPE_MODE (integer_type_node));
1753 /* Copy all or part of a value X into registers starting at REGNO.
1754 The number of registers to be filled is NREGS. */
1757 move_block_to_reg (regno, x, nregs, mode)
1761 enum machine_mode mode;
1764 #ifdef HAVE_load_multiple
1772 if (CONSTANT_P (x) && ! LEGITIMATE_CONSTANT_P (x))
1773 x = validize_mem (force_const_mem (mode, x));
1775 /* See if the machine can do this with a load multiple insn. */
1776 #ifdef HAVE_load_multiple
1777 if (HAVE_load_multiple)
1779 last = get_last_insn ();
1780 pat = gen_load_multiple (gen_rtx_REG (word_mode, regno), x,
1788 delete_insns_since (last);
1792 for (i = 0; i < nregs; i++)
1793 emit_move_insn (gen_rtx_REG (word_mode, regno + i),
1794 operand_subword_force (x, i, mode));
1797 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
1798 The number of registers to be filled is NREGS. SIZE indicates the number
1799 of bytes in the object X. */
1803 move_block_from_reg (regno, x, nregs, size)
1810 #ifdef HAVE_store_multiple
1814 enum machine_mode mode;
1816 /* If SIZE is that of a mode no bigger than a word, just use that
1817 mode's store operation. */
1818 if (size <= UNITS_PER_WORD
1819 && (mode = mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0)) != BLKmode)
1821 emit_move_insn (change_address (x, mode, NULL),
1822 gen_rtx_REG (mode, regno));
1826 /* Blocks smaller than a word on a BYTES_BIG_ENDIAN machine must be aligned
1827 to the left before storing to memory. Note that the previous test
1828 doesn't handle all cases (e.g. SIZE == 3). */
1829 if (size < UNITS_PER_WORD && BYTES_BIG_ENDIAN)
1831 rtx tem = operand_subword (x, 0, 1, BLKmode);
1837 shift = expand_shift (LSHIFT_EXPR, word_mode,
1838 gen_rtx_REG (word_mode, regno),
1839 build_int_2 ((UNITS_PER_WORD - size)
1840 * BITS_PER_UNIT, 0), NULL_RTX, 0);
1841 emit_move_insn (tem, shift);
1845 /* See if the machine can do this with a store multiple insn. */
1846 #ifdef HAVE_store_multiple
1847 if (HAVE_store_multiple)
1849 last = get_last_insn ();
1850 pat = gen_store_multiple (x, gen_rtx_REG (word_mode, regno),
1858 delete_insns_since (last);
1862 for (i = 0; i < nregs; i++)
1864 rtx tem = operand_subword (x, i, 1, BLKmode);
1869 emit_move_insn (tem, gen_rtx_REG (word_mode, regno + i));
1873 /* Emit code to move a block SRC to a block DST, where DST is non-consecutive
1874 registers represented by a PARALLEL. SSIZE represents the total size of
1875 block SRC in bytes, or -1 if not known. ALIGN is the known alignment of
1877 /* ??? If SSIZE % UNITS_PER_WORD != 0, we make the blatent assumption that
1878 the balance will be in what would be the low-order memory addresses, i.e.
1879 left justified for big endian, right justified for little endian. This
1880 happens to be true for the targets currently using this support. If this
1881 ever changes, a new target macro along the lines of FUNCTION_ARG_PADDING
1885 emit_group_load (dst, orig_src, ssize, align)
1893 if (GET_CODE (dst) != PARALLEL)
1896 /* Check for a NULL entry, used to indicate that the parameter goes
1897 both on the stack and in registers. */
1898 if (XEXP (XVECEXP (dst, 0, 0), 0))
1903 tmps = (rtx *) alloca (sizeof(rtx) * XVECLEN (dst, 0));
1905 /* If we won't be loading directly from memory, protect the real source
1906 from strange tricks we might play. */
1908 if (GET_CODE (src) != MEM)
1910 if (GET_CODE (src) == VOIDmode)
1911 src = gen_reg_rtx (GET_MODE (dst));
1913 src = gen_reg_rtx (GET_MODE (orig_src));
1914 emit_move_insn (src, orig_src);
1917 /* Process the pieces. */
1918 for (i = start; i < XVECLEN (dst, 0); i++)
1920 enum machine_mode mode = GET_MODE (XEXP (XVECEXP (dst, 0, i), 0));
1921 int bytepos = INTVAL (XEXP (XVECEXP (dst, 0, i), 1));
1922 int bytelen = GET_MODE_SIZE (mode);
1925 /* Handle trailing fragments that run over the size of the struct. */
1926 if (ssize >= 0 && bytepos + bytelen > ssize)
1928 shift = (bytelen - (ssize - bytepos)) * BITS_PER_UNIT;
1929 bytelen = ssize - bytepos;
1934 /* Optimize the access just a bit. */
1935 if (GET_CODE (src) == MEM
1936 && align * BITS_PER_UNIT >= GET_MODE_ALIGNMENT (mode)
1937 && bytepos * BITS_PER_UNIT % GET_MODE_ALIGNMENT (mode) == 0
1938 && bytelen == GET_MODE_SIZE (mode))
1940 tmps[i] = gen_reg_rtx (mode);
1941 emit_move_insn (tmps[i],
1942 change_address (src, mode,
1943 plus_constant (XEXP (src, 0),
1946 else if (GET_CODE (src) == CONCAT)
1949 && bytelen == GET_MODE_SIZE (GET_MODE (XEXP (src, 0))))
1950 tmps[i] = XEXP (src, 0);
1951 else if (bytepos == GET_MODE_SIZE (GET_MODE (XEXP (src, 0)))
1952 && bytelen == GET_MODE_SIZE (GET_MODE (XEXP (src, 1))))
1953 tmps[i] = XEXP (src, 1);
1959 tmps[i] = extract_bit_field (src, bytelen*BITS_PER_UNIT,
1960 bytepos*BITS_PER_UNIT, 1, NULL_RTX,
1961 mode, mode, align, ssize);
1964 if (BYTES_BIG_ENDIAN && shift)
1966 expand_binop (mode, ashl_optab, tmps[i], GEN_INT (shift),
1967 tmps[i], 0, OPTAB_WIDEN);
1972 /* Copy the extracted pieces into the proper (probable) hard regs. */
1973 for (i = start; i < XVECLEN (dst, 0); i++)
1974 emit_move_insn (XEXP (XVECEXP (dst, 0, i), 0), tmps[i]);
1977 /* Emit code to move a block SRC to a block DST, where SRC is non-consecutive
1978 registers represented by a PARALLEL. SSIZE represents the total size of
1979 block DST, or -1 if not known. ALIGN is the known alignment of DST. */
1982 emit_group_store (orig_dst, src, ssize, align)
1990 if (GET_CODE (src) != PARALLEL)
1993 /* Check for a NULL entry, used to indicate that the parameter goes
1994 both on the stack and in registers. */
1995 if (XEXP (XVECEXP (src, 0, 0), 0))
2000 tmps = (rtx *) alloca (sizeof(rtx) * XVECLEN (src, 0));
2002 /* Copy the (probable) hard regs into pseudos. */
2003 for (i = start; i < XVECLEN (src, 0); i++)
2005 rtx reg = XEXP (XVECEXP (src, 0, i), 0);
2006 tmps[i] = gen_reg_rtx (GET_MODE (reg));
2007 emit_move_insn (tmps[i], reg);
2011 /* If we won't be storing directly into memory, protect the real destination
2012 from strange tricks we might play. */
2014 if (GET_CODE (dst) == PARALLEL)
2018 /* We can get a PARALLEL dst if there is a conditional expression in
2019 a return statement. In that case, the dst and src are the same,
2020 so no action is necessary. */
2021 if (rtx_equal_p (dst, src))
2024 /* It is unclear if we can ever reach here, but we may as well handle
2025 it. Allocate a temporary, and split this into a store/load to/from
2028 temp = assign_stack_temp (GET_MODE (dst), ssize, 0);
2029 emit_group_store (temp, src, ssize, align);
2030 emit_group_load (dst, temp, ssize, align);
2033 else if (GET_CODE (dst) != MEM)
2035 dst = gen_reg_rtx (GET_MODE (orig_dst));
2036 /* Make life a bit easier for combine. */
2037 emit_move_insn (dst, const0_rtx);
2039 else if (! MEM_IN_STRUCT_P (dst))
2041 /* store_bit_field requires that memory operations have
2042 mem_in_struct_p set; we might not. */
2044 dst = copy_rtx (orig_dst);
2045 MEM_SET_IN_STRUCT_P (dst, 1);
2048 /* Process the pieces. */
2049 for (i = start; i < XVECLEN (src, 0); i++)
2051 int bytepos = INTVAL (XEXP (XVECEXP (src, 0, i), 1));
2052 enum machine_mode mode = GET_MODE (tmps[i]);
2053 int bytelen = GET_MODE_SIZE (mode);
2055 /* Handle trailing fragments that run over the size of the struct. */
2056 if (ssize >= 0 && bytepos + bytelen > ssize)
2058 if (BYTES_BIG_ENDIAN)
2060 int shift = (bytelen - (ssize - bytepos)) * BITS_PER_UNIT;
2061 expand_binop (mode, ashr_optab, tmps[i], GEN_INT (shift),
2062 tmps[i], 0, OPTAB_WIDEN);
2064 bytelen = ssize - bytepos;
2067 /* Optimize the access just a bit. */
2068 if (GET_CODE (dst) == MEM
2069 && align * BITS_PER_UNIT >= GET_MODE_ALIGNMENT (mode)
2070 && bytepos * BITS_PER_UNIT % GET_MODE_ALIGNMENT (mode) == 0
2071 && bytelen == GET_MODE_SIZE (mode))
2072 emit_move_insn (change_address (dst, mode,
2073 plus_constant (XEXP (dst, 0),
2077 store_bit_field (dst, bytelen * BITS_PER_UNIT, bytepos * BITS_PER_UNIT,
2078 mode, tmps[i], align, ssize);
2083 /* Copy from the pseudo into the (probable) hard reg. */
2084 if (GET_CODE (dst) == REG)
2085 emit_move_insn (orig_dst, dst);
2088 /* Generate code to copy a BLKmode object of TYPE out of a
2089 set of registers starting with SRCREG into TGTBLK. If TGTBLK
2090 is null, a stack temporary is created. TGTBLK is returned.
2092 The primary purpose of this routine is to handle functions
2093 that return BLKmode structures in registers. Some machines
2094 (the PA for example) want to return all small structures
2095 in registers regardless of the structure's alignment. */
2098 copy_blkmode_from_reg (tgtblk,srcreg,type)
2103 int bytes = int_size_in_bytes (type);
2104 rtx src = NULL, dst = NULL;
2105 int bitsize = MIN (TYPE_ALIGN (type), BITS_PER_WORD);
2106 int bitpos, xbitpos, big_endian_correction = 0;
2110 tgtblk = assign_stack_temp (BLKmode, bytes, 0);
2111 MEM_SET_IN_STRUCT_P (tgtblk, AGGREGATE_TYPE_P (type));
2112 preserve_temp_slots (tgtblk);
2115 /* This code assumes srcreg is at least a full word. If it isn't,
2116 copy it into a new pseudo which is a full word. */
2117 if (GET_MODE (srcreg) != BLKmode
2118 && GET_MODE_SIZE (GET_MODE (srcreg)) < UNITS_PER_WORD)
2119 srcreg = convert_to_mode (word_mode, srcreg,
2120 TREE_UNSIGNED (type));
2122 /* Structures whose size is not a multiple of a word are aligned
2123 to the least significant byte (to the right). On a BYTES_BIG_ENDIAN
2124 machine, this means we must skip the empty high order bytes when
2125 calculating the bit offset. */
2126 if (BYTES_BIG_ENDIAN && bytes % UNITS_PER_WORD)
2127 big_endian_correction = (BITS_PER_WORD - ((bytes % UNITS_PER_WORD)
2130 /* Copy the structure BITSIZE bites at a time.
2132 We could probably emit more efficient code for machines
2133 which do not use strict alignment, but it doesn't seem
2134 worth the effort at the current time. */
2135 for (bitpos = 0, xbitpos = big_endian_correction;
2136 bitpos < bytes * BITS_PER_UNIT;
2137 bitpos += bitsize, xbitpos += bitsize)
2140 /* We need a new source operand each time xbitpos is on a
2141 word boundary and when xbitpos == big_endian_correction
2142 (the first time through). */
2143 if (xbitpos % BITS_PER_WORD == 0
2144 || xbitpos == big_endian_correction)
2145 src = operand_subword_force (srcreg,
2146 xbitpos / BITS_PER_WORD,
2149 /* We need a new destination operand each time bitpos is on
2151 if (bitpos % BITS_PER_WORD == 0)
2152 dst = operand_subword (tgtblk, bitpos / BITS_PER_WORD, 1, BLKmode);
2154 /* Use xbitpos for the source extraction (right justified) and
2155 xbitpos for the destination store (left justified). */
2156 store_bit_field (dst, bitsize, bitpos % BITS_PER_WORD, word_mode,
2157 extract_bit_field (src, bitsize,
2158 xbitpos % BITS_PER_WORD, 1,
2159 NULL_RTX, word_mode,
2161 bitsize / BITS_PER_UNIT,
2163 bitsize / BITS_PER_UNIT, BITS_PER_WORD);
2169 /* Add a USE expression for REG to the (possibly empty) list pointed
2170 to by CALL_FUSAGE. REG must denote a hard register. */
2173 use_reg (call_fusage, reg)
2174 rtx *call_fusage, reg;
2176 if (GET_CODE (reg) != REG
2177 || REGNO (reg) >= FIRST_PSEUDO_REGISTER)
2181 = gen_rtx_EXPR_LIST (VOIDmode,
2182 gen_rtx_USE (VOIDmode, reg), *call_fusage);
2185 /* Add USE expressions to *CALL_FUSAGE for each of NREGS consecutive regs,
2186 starting at REGNO. All of these registers must be hard registers. */
2189 use_regs (call_fusage, regno, nregs)
2196 if (regno + nregs > FIRST_PSEUDO_REGISTER)
2199 for (i = 0; i < nregs; i++)
2200 use_reg (call_fusage, gen_rtx_REG (reg_raw_mode[regno + i], regno + i));
2203 /* Add USE expressions to *CALL_FUSAGE for each REG contained in the
2204 PARALLEL REGS. This is for calls that pass values in multiple
2205 non-contiguous locations. The Irix 6 ABI has examples of this. */
2208 use_group_regs (call_fusage, regs)
2214 for (i = 0; i < XVECLEN (regs, 0); i++)
2216 rtx reg = XEXP (XVECEXP (regs, 0, i), 0);
2218 /* A NULL entry means the parameter goes both on the stack and in
2219 registers. This can also be a MEM for targets that pass values
2220 partially on the stack and partially in registers. */
2221 if (reg != 0 && GET_CODE (reg) == REG)
2222 use_reg (call_fusage, reg);
2226 /* Generate several move instructions to clear LEN bytes of block TO.
2227 (A MEM rtx with BLKmode). The caller must pass TO through
2228 protect_from_queue before calling. ALIGN (in bytes) is maximum alignment
2232 clear_by_pieces (to, len, align)
2237 struct clear_by_pieces data;
2238 rtx to_addr = XEXP (to, 0);
2239 int max_size = MOVE_MAX_PIECES + 1;
2240 enum machine_mode mode = VOIDmode, tmode;
2241 enum insn_code icode;
2244 data.to_addr = to_addr;
2247 = (GET_CODE (to_addr) == PRE_INC || GET_CODE (to_addr) == PRE_DEC
2248 || GET_CODE (to_addr) == POST_INC || GET_CODE (to_addr) == POST_DEC);
2250 data.explicit_inc_to = 0;
2252 = (GET_CODE (to_addr) == PRE_DEC || GET_CODE (to_addr) == POST_DEC);
2253 if (data.reverse) data.offset = len;
2256 data.to_struct = MEM_IN_STRUCT_P (to);
2258 /* If copying requires more than two move insns,
2259 copy addresses to registers (to make displacements shorter)
2260 and use post-increment if available. */
2262 && move_by_pieces_ninsns (len, align) > 2)
2264 /* Determine the main mode we'll be using */
2265 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
2266 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
2267 if (GET_MODE_SIZE (tmode) < max_size)
2270 if (USE_STORE_PRE_DECREMENT (mode) && data.reverse && ! data.autinc_to)
2272 data.to_addr = copy_addr_to_reg (plus_constant (to_addr, len));
2274 data.explicit_inc_to = -1;
2276 if (USE_STORE_POST_INCREMENT (mode) && ! data.reverse && ! data.autinc_to)
2278 data.to_addr = copy_addr_to_reg (to_addr);
2280 data.explicit_inc_to = 1;
2282 if (!data.autinc_to && CONSTANT_P (to_addr))
2283 data.to_addr = copy_addr_to_reg (to_addr);
2286 if (! SLOW_UNALIGNED_ACCESS (word_mode, align)
2287 || align > MOVE_MAX || align >= BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2290 /* First move what we can in the largest integer mode, then go to
2291 successively smaller modes. */
2293 while (max_size > 1)
2295 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
2296 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
2297 if (GET_MODE_SIZE (tmode) < max_size)
2300 if (mode == VOIDmode)
2303 icode = mov_optab->handlers[(int) mode].insn_code;
2304 if (icode != CODE_FOR_nothing
2305 && align >= GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT)
2306 clear_by_pieces_1 (GEN_FCN (icode), mode, &data);
2308 max_size = GET_MODE_SIZE (mode);
2311 /* The code above should have handled everything. */
2316 /* Subroutine of clear_by_pieces. Clear as many bytes as appropriate
2317 with move instructions for mode MODE. GENFUN is the gen_... function
2318 to make a move insn for that mode. DATA has all the other info. */
2321 clear_by_pieces_1 (genfun, mode, data)
2322 rtx (*genfun) PARAMS ((rtx, ...));
2323 enum machine_mode mode;
2324 struct clear_by_pieces *data;
2326 register int size = GET_MODE_SIZE (mode);
2329 while (data->len >= size)
2331 if (data->reverse) data->offset -= size;
2333 to1 = (data->autinc_to
2334 ? gen_rtx_MEM (mode, data->to_addr)
2335 : copy_rtx (change_address (data->to, mode,
2336 plus_constant (data->to_addr,
2338 MEM_IN_STRUCT_P (to1) = data->to_struct;
2340 if (HAVE_PRE_DECREMENT && data->explicit_inc_to < 0)
2341 emit_insn (gen_add2_insn (data->to_addr, GEN_INT (-size)));
2343 emit_insn ((*genfun) (to1, const0_rtx));
2344 if (HAVE_POST_INCREMENT && data->explicit_inc_to > 0)
2345 emit_insn (gen_add2_insn (data->to_addr, GEN_INT (size)));
2347 if (! data->reverse) data->offset += size;
2353 /* Write zeros through the storage of OBJECT.
2354 If OBJECT has BLKmode, SIZE is its length in bytes and ALIGN is
2355 the maximum alignment we can is has, measured in bytes.
2357 If we call a function that returns the length of the block, return it. */
2360 clear_storage (object, size, align)
2365 #ifdef TARGET_MEM_FUNCTIONS
2367 tree call_expr, arg_list;
2371 if (GET_MODE (object) == BLKmode)
2373 object = protect_from_queue (object, 1);
2374 size = protect_from_queue (size, 0);
2376 if (GET_CODE (size) == CONST_INT
2377 && MOVE_BY_PIECES_P (INTVAL (size), align))
2378 clear_by_pieces (object, INTVAL (size), align);
2382 /* Try the most limited insn first, because there's no point
2383 including more than one in the machine description unless
2384 the more limited one has some advantage. */
2386 rtx opalign = GEN_INT (align);
2387 enum machine_mode mode;
2389 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
2390 mode = GET_MODE_WIDER_MODE (mode))
2392 enum insn_code code = clrstr_optab[(int) mode];
2393 insn_operand_predicate_fn pred;
2395 if (code != CODE_FOR_nothing
2396 /* We don't need MODE to be narrower than
2397 BITS_PER_HOST_WIDE_INT here because if SIZE is less than
2398 the mode mask, as it is returned by the macro, it will
2399 definitely be less than the actual mode mask. */
2400 && ((GET_CODE (size) == CONST_INT
2401 && ((unsigned HOST_WIDE_INT) INTVAL (size)
2402 <= (GET_MODE_MASK (mode) >> 1)))
2403 || GET_MODE_BITSIZE (mode) >= BITS_PER_WORD)
2404 && ((pred = insn_data[(int) code].operand[0].predicate) == 0
2405 || (*pred) (object, BLKmode))
2406 && ((pred = insn_data[(int) code].operand[2].predicate) == 0
2407 || (*pred) (opalign, VOIDmode)))
2410 rtx last = get_last_insn ();
2413 op1 = convert_to_mode (mode, size, 1);
2414 pred = insn_data[(int) code].operand[1].predicate;
2415 if (pred != 0 && ! (*pred) (op1, mode))
2416 op1 = copy_to_mode_reg (mode, op1);
2418 pat = GEN_FCN ((int) code) (object, op1, opalign);
2425 delete_insns_since (last);
2429 /* OBJECT or SIZE may have been passed through protect_from_queue.
2431 It is unsafe to save the value generated by protect_from_queue
2432 and reuse it later. Consider what happens if emit_queue is
2433 called before the return value from protect_from_queue is used.
2435 Expansion of the CALL_EXPR below will call emit_queue before
2436 we are finished emitting RTL for argument setup. So if we are
2437 not careful we could get the wrong value for an argument.
2439 To avoid this problem we go ahead and emit code to copy OBJECT
2440 and SIZE into new pseudos. We can then place those new pseudos
2441 into an RTL_EXPR and use them later, even after a call to
2444 Note this is not strictly needed for library calls since they
2445 do not call emit_queue before loading their arguments. However,
2446 we may need to have library calls call emit_queue in the future
2447 since failing to do so could cause problems for targets which
2448 define SMALL_REGISTER_CLASSES and pass arguments in registers. */
2449 object = copy_to_mode_reg (Pmode, XEXP (object, 0));
2451 #ifdef TARGET_MEM_FUNCTIONS
2452 size = copy_to_mode_reg (TYPE_MODE (sizetype), size);
2454 size = convert_to_mode (TYPE_MODE (integer_type_node), size,
2455 TREE_UNSIGNED (integer_type_node));
2456 size = copy_to_mode_reg (TYPE_MODE (integer_type_node), size);
2460 #ifdef TARGET_MEM_FUNCTIONS
2461 /* It is incorrect to use the libcall calling conventions to call
2462 memset in this context.
2464 This could be a user call to memset and the user may wish to
2465 examine the return value from memset.
2467 For targets where libcalls and normal calls have different
2468 conventions for returning pointers, we could end up generating
2471 So instead of using a libcall sequence we build up a suitable
2472 CALL_EXPR and expand the call in the normal fashion. */
2473 if (fn == NULL_TREE)
2477 /* This was copied from except.c, I don't know if all this is
2478 necessary in this context or not. */
2479 fn = get_identifier ("memset");
2480 push_obstacks_nochange ();
2481 end_temporary_allocation ();
2482 fntype = build_pointer_type (void_type_node);
2483 fntype = build_function_type (fntype, NULL_TREE);
2484 fn = build_decl (FUNCTION_DECL, fn, fntype);
2485 ggc_add_tree_root (&fn, 1);
2486 DECL_EXTERNAL (fn) = 1;
2487 TREE_PUBLIC (fn) = 1;
2488 DECL_ARTIFICIAL (fn) = 1;
2489 make_decl_rtl (fn, NULL_PTR, 1);
2490 assemble_external (fn);
2494 /* We need to make an argument list for the function call.
2496 memset has three arguments, the first is a void * addresses, the
2497 second a integer with the initialization value, the last is a
2498 size_t byte count for the copy. */
2500 = build_tree_list (NULL_TREE,
2501 make_tree (build_pointer_type (void_type_node),
2503 TREE_CHAIN (arg_list)
2504 = build_tree_list (NULL_TREE,
2505 make_tree (integer_type_node, const0_rtx));
2506 TREE_CHAIN (TREE_CHAIN (arg_list))
2507 = build_tree_list (NULL_TREE, make_tree (sizetype, size));
2508 TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (arg_list))) = NULL_TREE;
2510 /* Now we have to build up the CALL_EXPR itself. */
2511 call_expr = build1 (ADDR_EXPR,
2512 build_pointer_type (TREE_TYPE (fn)), fn);
2513 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
2514 call_expr, arg_list, NULL_TREE);
2515 TREE_SIDE_EFFECTS (call_expr) = 1;
2517 retval = expand_expr (call_expr, NULL_RTX, VOIDmode, 0);
2519 emit_library_call (bzero_libfunc, 0,
2520 VOIDmode, 2, object, Pmode, size,
2521 TYPE_MODE (integer_type_node));
2526 emit_move_insn (object, CONST0_RTX (GET_MODE (object)));
2531 /* Generate code to copy Y into X.
2532 Both Y and X must have the same mode, except that
2533 Y can be a constant with VOIDmode.
2534 This mode cannot be BLKmode; use emit_block_move for that.
2536 Return the last instruction emitted. */
2539 emit_move_insn (x, y)
2542 enum machine_mode mode = GET_MODE (x);
2544 x = protect_from_queue (x, 1);
2545 y = protect_from_queue (y, 0);
2547 if (mode == BLKmode || (GET_MODE (y) != mode && GET_MODE (y) != VOIDmode))
2550 /* Never force constant_p_rtx to memory. */
2551 if (GET_CODE (y) == CONSTANT_P_RTX)
2553 else if (CONSTANT_P (y) && ! LEGITIMATE_CONSTANT_P (y))
2554 y = force_const_mem (mode, y);
2556 /* If X or Y are memory references, verify that their addresses are valid
2558 if (GET_CODE (x) == MEM
2559 && ((! memory_address_p (GET_MODE (x), XEXP (x, 0))
2560 && ! push_operand (x, GET_MODE (x)))
2562 && CONSTANT_ADDRESS_P (XEXP (x, 0)))))
2563 x = change_address (x, VOIDmode, XEXP (x, 0));
2565 if (GET_CODE (y) == MEM
2566 && (! memory_address_p (GET_MODE (y), XEXP (y, 0))
2568 && CONSTANT_ADDRESS_P (XEXP (y, 0)))))
2569 y = change_address (y, VOIDmode, XEXP (y, 0));
2571 if (mode == BLKmode)
2574 return emit_move_insn_1 (x, y);
2577 /* Low level part of emit_move_insn.
2578 Called just like emit_move_insn, but assumes X and Y
2579 are basically valid. */
2582 emit_move_insn_1 (x, y)
2585 enum machine_mode mode = GET_MODE (x);
2586 enum machine_mode submode;
2587 enum mode_class class = GET_MODE_CLASS (mode);
2590 if (mode >= MAX_MACHINE_MODE)
2593 if (mov_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing)
2595 emit_insn (GEN_FCN (mov_optab->handlers[(int) mode].insn_code) (x, y));
2597 /* Expand complex moves by moving real part and imag part, if possible. */
2598 else if ((class == MODE_COMPLEX_FLOAT || class == MODE_COMPLEX_INT)
2599 && BLKmode != (submode = mode_for_size ((GET_MODE_UNIT_SIZE (mode)
2601 (class == MODE_COMPLEX_INT
2602 ? MODE_INT : MODE_FLOAT),
2604 && (mov_optab->handlers[(int) submode].insn_code
2605 != CODE_FOR_nothing))
2607 /* Don't split destination if it is a stack push. */
2608 int stack = push_operand (x, GET_MODE (x));
2610 /* If this is a stack, push the highpart first, so it
2611 will be in the argument order.
2613 In that case, change_address is used only to convert
2614 the mode, not to change the address. */
2617 /* Note that the real part always precedes the imag part in memory
2618 regardless of machine's endianness. */
2619 #ifdef STACK_GROWS_DOWNWARD
2620 emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code)
2621 (gen_rtx_MEM (submode, (XEXP (x, 0))),
2622 gen_imagpart (submode, y)));
2623 emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code)
2624 (gen_rtx_MEM (submode, (XEXP (x, 0))),
2625 gen_realpart (submode, y)));
2627 emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code)
2628 (gen_rtx_MEM (submode, (XEXP (x, 0))),
2629 gen_realpart (submode, y)));
2630 emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code)
2631 (gen_rtx_MEM (submode, (XEXP (x, 0))),
2632 gen_imagpart (submode, y)));
2637 rtx realpart_x, realpart_y;
2638 rtx imagpart_x, imagpart_y;
2640 /* If this is a complex value with each part being smaller than a
2641 word, the usual calling sequence will likely pack the pieces into
2642 a single register. Unfortunately, SUBREG of hard registers only
2643 deals in terms of words, so we have a problem converting input
2644 arguments to the CONCAT of two registers that is used elsewhere
2645 for complex values. If this is before reload, we can copy it into
2646 memory and reload. FIXME, we should see about using extract and
2647 insert on integer registers, but complex short and complex char
2648 variables should be rarely used. */
2649 if (GET_MODE_BITSIZE (mode) < 2*BITS_PER_WORD
2650 && (reload_in_progress | reload_completed) == 0)
2652 int packed_dest_p = (REG_P (x) && REGNO (x) < FIRST_PSEUDO_REGISTER);
2653 int packed_src_p = (REG_P (y) && REGNO (y) < FIRST_PSEUDO_REGISTER);
2655 if (packed_dest_p || packed_src_p)
2657 enum mode_class reg_class = ((class == MODE_COMPLEX_FLOAT)
2658 ? MODE_FLOAT : MODE_INT);
2660 enum machine_mode reg_mode =
2661 mode_for_size (GET_MODE_BITSIZE (mode), reg_class, 1);
2663 if (reg_mode != BLKmode)
2665 rtx mem = assign_stack_temp (reg_mode,
2666 GET_MODE_SIZE (mode), 0);
2668 rtx cmem = change_address (mem, mode, NULL_RTX);
2670 cfun->cannot_inline = "function uses short complex types";
2674 rtx sreg = gen_rtx_SUBREG (reg_mode, x, 0);
2675 emit_move_insn_1 (cmem, y);
2676 return emit_move_insn_1 (sreg, mem);
2680 rtx sreg = gen_rtx_SUBREG (reg_mode, y, 0);
2681 emit_move_insn_1 (mem, sreg);
2682 return emit_move_insn_1 (x, cmem);
2688 realpart_x = gen_realpart (submode, x);
2689 realpart_y = gen_realpart (submode, y);
2690 imagpart_x = gen_imagpart (submode, x);
2691 imagpart_y = gen_imagpart (submode, y);
2693 /* Show the output dies here. This is necessary for SUBREGs
2694 of pseudos since we cannot track their lifetimes correctly;
2695 hard regs shouldn't appear here except as return values.
2696 We never want to emit such a clobber after reload. */
2698 && ! (reload_in_progress || reload_completed)
2699 && (GET_CODE (realpart_x) == SUBREG
2700 || GET_CODE (imagpart_x) == SUBREG))
2702 emit_insn (gen_rtx_CLOBBER (VOIDmode, x));
2705 emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code)
2706 (realpart_x, realpart_y));
2707 emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code)
2708 (imagpart_x, imagpart_y));
2711 return get_last_insn ();
2714 /* This will handle any multi-word mode that lacks a move_insn pattern.
2715 However, you will get better code if you define such patterns,
2716 even if they must turn into multiple assembler instructions. */
2717 else if (GET_MODE_SIZE (mode) > UNITS_PER_WORD)
2723 #ifdef PUSH_ROUNDING
2725 /* If X is a push on the stack, do the push now and replace
2726 X with a reference to the stack pointer. */
2727 if (push_operand (x, GET_MODE (x)))
2729 anti_adjust_stack (GEN_INT (GET_MODE_SIZE (GET_MODE (x))));
2730 x = change_address (x, VOIDmode, stack_pointer_rtx);
2738 i < (GET_MODE_SIZE (mode) + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD;
2741 rtx xpart = operand_subword (x, i, 1, mode);
2742 rtx ypart = operand_subword (y, i, 1, mode);
2744 /* If we can't get a part of Y, put Y into memory if it is a
2745 constant. Otherwise, force it into a register. If we still
2746 can't get a part of Y, abort. */
2747 if (ypart == 0 && CONSTANT_P (y))
2749 y = force_const_mem (mode, y);
2750 ypart = operand_subword (y, i, 1, mode);
2752 else if (ypart == 0)
2753 ypart = operand_subword_force (y, i, mode);
2755 if (xpart == 0 || ypart == 0)
2758 need_clobber |= (GET_CODE (xpart) == SUBREG);
2760 last_insn = emit_move_insn (xpart, ypart);
2763 seq = gen_sequence ();
2766 /* Show the output dies here. This is necessary for SUBREGs
2767 of pseudos since we cannot track their lifetimes correctly;
2768 hard regs shouldn't appear here except as return values.
2769 We never want to emit such a clobber after reload. */
2771 && ! (reload_in_progress || reload_completed)
2772 && need_clobber != 0)
2774 emit_insn (gen_rtx_CLOBBER (VOIDmode, x));
2785 /* Pushing data onto the stack. */
2787 /* Push a block of length SIZE (perhaps variable)
2788 and return an rtx to address the beginning of the block.
2789 Note that it is not possible for the value returned to be a QUEUED.
2790 The value may be virtual_outgoing_args_rtx.
2792 EXTRA is the number of bytes of padding to push in addition to SIZE.
2793 BELOW nonzero means this padding comes at low addresses;
2794 otherwise, the padding comes at high addresses. */
2797 push_block (size, extra, below)
2803 size = convert_modes (Pmode, ptr_mode, size, 1);
2804 if (CONSTANT_P (size))
2805 anti_adjust_stack (plus_constant (size, extra));
2806 else if (GET_CODE (size) == REG && extra == 0)
2807 anti_adjust_stack (size);
2810 rtx temp = copy_to_mode_reg (Pmode, size);
2812 temp = expand_binop (Pmode, add_optab, temp, GEN_INT (extra),
2813 temp, 0, OPTAB_LIB_WIDEN);
2814 anti_adjust_stack (temp);
2817 #if defined (STACK_GROWS_DOWNWARD) \
2818 || (defined (ARGS_GROW_DOWNWARD) \
2819 && !defined (ACCUMULATE_OUTGOING_ARGS))
2821 /* Return the lowest stack address when STACK or ARGS grow downward and
2822 we are not aaccumulating outgoing arguments (the c4x port uses such
2824 temp = virtual_outgoing_args_rtx;
2825 if (extra != 0 && below)
2826 temp = plus_constant (temp, extra);
2828 if (GET_CODE (size) == CONST_INT)
2829 temp = plus_constant (virtual_outgoing_args_rtx,
2830 - INTVAL (size) - (below ? 0 : extra));
2831 else if (extra != 0 && !below)
2832 temp = gen_rtx_PLUS (Pmode, virtual_outgoing_args_rtx,
2833 negate_rtx (Pmode, plus_constant (size, extra)));
2835 temp = gen_rtx_PLUS (Pmode, virtual_outgoing_args_rtx,
2836 negate_rtx (Pmode, size));
2839 return memory_address (GET_CLASS_NARROWEST_MODE (MODE_INT), temp);
2845 return gen_rtx_fmt_e (STACK_PUSH_CODE, Pmode, stack_pointer_rtx);
2848 /* Return an rtx for the address of the beginning of a as-if-it-was-pushed
2849 block of SIZE bytes. */
2852 get_push_address (size)
2857 if (STACK_PUSH_CODE == POST_DEC)
2858 temp = gen_rtx_PLUS (Pmode, stack_pointer_rtx, GEN_INT (size));
2859 else if (STACK_PUSH_CODE == POST_INC)
2860 temp = gen_rtx_MINUS (Pmode, stack_pointer_rtx, GEN_INT (size));
2862 temp = stack_pointer_rtx;
2864 return copy_to_reg (temp);
2867 /* Generate code to push X onto the stack, assuming it has mode MODE and
2869 MODE is redundant except when X is a CONST_INT (since they don't
2871 SIZE is an rtx for the size of data to be copied (in bytes),
2872 needed only if X is BLKmode.
2874 ALIGN (in bytes) is maximum alignment we can assume.
2876 If PARTIAL and REG are both nonzero, then copy that many of the first
2877 words of X into registers starting with REG, and push the rest of X.
2878 The amount of space pushed is decreased by PARTIAL words,
2879 rounded *down* to a multiple of PARM_BOUNDARY.
2880 REG must be a hard register in this case.
2881 If REG is zero but PARTIAL is not, take any all others actions for an
2882 argument partially in registers, but do not actually load any
2885 EXTRA is the amount in bytes of extra space to leave next to this arg.
2886 This is ignored if an argument block has already been allocated.
2888 On a machine that lacks real push insns, ARGS_ADDR is the address of
2889 the bottom of the argument block for this call. We use indexing off there
2890 to store the arg. On machines with push insns, ARGS_ADDR is 0 when a
2891 argument block has not been preallocated.
2893 ARGS_SO_FAR is the size of args previously pushed for this call.
2895 REG_PARM_STACK_SPACE is nonzero if functions require stack space
2896 for arguments passed in registers. If nonzero, it will be the number
2897 of bytes required. */
2900 emit_push_insn (x, mode, type, size, align, partial, reg, extra,
2901 args_addr, args_so_far, reg_parm_stack_space,
2904 enum machine_mode mode;
2913 int reg_parm_stack_space;
2917 enum direction stack_direction
2918 #ifdef STACK_GROWS_DOWNWARD
2924 /* Decide where to pad the argument: `downward' for below,
2925 `upward' for above, or `none' for don't pad it.
2926 Default is below for small data on big-endian machines; else above. */
2927 enum direction where_pad = FUNCTION_ARG_PADDING (mode, type);
2929 /* Invert direction if stack is post-update. */
2930 if (STACK_PUSH_CODE == POST_INC || STACK_PUSH_CODE == POST_DEC)
2931 if (where_pad != none)
2932 where_pad = (where_pad == downward ? upward : downward);
2934 xinner = x = protect_from_queue (x, 0);
2936 if (mode == BLKmode)
2938 /* Copy a block into the stack, entirely or partially. */
2941 int used = partial * UNITS_PER_WORD;
2942 int offset = used % (PARM_BOUNDARY / BITS_PER_UNIT);
2950 /* USED is now the # of bytes we need not copy to the stack
2951 because registers will take care of them. */
2954 xinner = change_address (xinner, BLKmode,
2955 plus_constant (XEXP (xinner, 0), used));
2957 /* If the partial register-part of the arg counts in its stack size,
2958 skip the part of stack space corresponding to the registers.
2959 Otherwise, start copying to the beginning of the stack space,
2960 by setting SKIP to 0. */
2961 skip = (reg_parm_stack_space == 0) ? 0 : used;
2963 #ifdef PUSH_ROUNDING
2964 /* Do it with several push insns if that doesn't take lots of insns
2965 and if there is no difficulty with push insns that skip bytes
2966 on the stack for alignment purposes. */
2968 && GET_CODE (size) == CONST_INT
2970 && (MOVE_BY_PIECES_P ((unsigned) INTVAL (size) - used, align))
2971 /* Here we avoid the case of a structure whose weak alignment
2972 forces many pushes of a small amount of data,
2973 and such small pushes do rounding that causes trouble. */
2974 && ((! SLOW_UNALIGNED_ACCESS (word_mode, align))
2975 || align >= BIGGEST_ALIGNMENT / BITS_PER_UNIT
2976 || PUSH_ROUNDING (align) == align)
2977 && PUSH_ROUNDING (INTVAL (size)) == INTVAL (size))
2979 /* Push padding now if padding above and stack grows down,
2980 or if padding below and stack grows up.
2981 But if space already allocated, this has already been done. */
2982 if (extra && args_addr == 0
2983 && where_pad != none && where_pad != stack_direction)
2984 anti_adjust_stack (GEN_INT (extra));
2986 move_by_pieces (gen_rtx_MEM (BLKmode, gen_push_operand ()), xinner,
2987 INTVAL (size) - used, align);
2989 if (current_function_check_memory_usage && ! in_check_memory_usage)
2993 in_check_memory_usage = 1;
2994 temp = get_push_address (INTVAL(size) - used);
2995 if (GET_CODE (x) == MEM && type && AGGREGATE_TYPE_P (type))
2996 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
2998 XEXP (xinner, 0), Pmode,
2999 GEN_INT (INTVAL(size) - used),
3000 TYPE_MODE (sizetype));
3002 emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3,
3004 GEN_INT (INTVAL(size) - used),
3005 TYPE_MODE (sizetype),
3006 GEN_INT (MEMORY_USE_RW),
3007 TYPE_MODE (integer_type_node));
3008 in_check_memory_usage = 0;
3012 #endif /* PUSH_ROUNDING */
3014 /* Otherwise make space on the stack and copy the data
3015 to the address of that space. */
3017 /* Deduct words put into registers from the size we must copy. */
3020 if (GET_CODE (size) == CONST_INT)
3021 size = GEN_INT (INTVAL (size) - used);
3023 size = expand_binop (GET_MODE (size), sub_optab, size,
3024 GEN_INT (used), NULL_RTX, 0,
3028 /* Get the address of the stack space.
3029 In this case, we do not deal with EXTRA separately.
3030 A single stack adjust will do. */
3033 temp = push_block (size, extra, where_pad == downward);
3036 else if (GET_CODE (args_so_far) == CONST_INT)
3037 temp = memory_address (BLKmode,
3038 plus_constant (args_addr,
3039 skip + INTVAL (args_so_far)));
3041 temp = memory_address (BLKmode,
3042 plus_constant (gen_rtx_PLUS (Pmode,
3046 if (current_function_check_memory_usage && ! in_check_memory_usage)
3050 in_check_memory_usage = 1;
3051 target = copy_to_reg (temp);
3052 if (GET_CODE (x) == MEM && type && AGGREGATE_TYPE_P (type))
3053 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
3055 XEXP (xinner, 0), Pmode,
3056 size, TYPE_MODE (sizetype));
3058 emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3,
3060 size, TYPE_MODE (sizetype),
3061 GEN_INT (MEMORY_USE_RW),
3062 TYPE_MODE (integer_type_node));
3063 in_check_memory_usage = 0;
3066 /* TEMP is the address of the block. Copy the data there. */
3067 if (GET_CODE (size) == CONST_INT
3068 && MOVE_BY_PIECES_P ((unsigned) INTVAL (size), align))
3070 move_by_pieces (gen_rtx_MEM (BLKmode, temp), xinner,
3071 INTVAL (size), align);
3076 rtx opalign = GEN_INT (align);
3077 enum machine_mode mode;
3078 rtx target = gen_rtx_MEM (BLKmode, temp);
3080 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
3082 mode = GET_MODE_WIDER_MODE (mode))
3084 enum insn_code code = movstr_optab[(int) mode];
3085 insn_operand_predicate_fn pred;
3087 if (code != CODE_FOR_nothing
3088 && ((GET_CODE (size) == CONST_INT
3089 && ((unsigned HOST_WIDE_INT) INTVAL (size)
3090 <= (GET_MODE_MASK (mode) >> 1)))
3091 || GET_MODE_BITSIZE (mode) >= BITS_PER_WORD)
3092 && (!(pred = insn_data[(int) code].operand[0].predicate)
3093 || ((*pred) (target, BLKmode)))
3094 && (!(pred = insn_data[(int) code].operand[1].predicate)
3095 || ((*pred) (xinner, BLKmode)))
3096 && (!(pred = insn_data[(int) code].operand[3].predicate)
3097 || ((*pred) (opalign, VOIDmode))))
3099 rtx op2 = convert_to_mode (mode, size, 1);
3100 rtx last = get_last_insn ();
3103 pred = insn_data[(int) code].operand[2].predicate;
3104 if (pred != 0 && ! (*pred) (op2, mode))
3105 op2 = copy_to_mode_reg (mode, op2);
3107 pat = GEN_FCN ((int) code) (target, xinner,
3115 delete_insns_since (last);
3120 #ifndef ACCUMULATE_OUTGOING_ARGS
3121 /* If the source is referenced relative to the stack pointer,
3122 copy it to another register to stabilize it. We do not need
3123 to do this if we know that we won't be changing sp. */
3125 if (reg_mentioned_p (virtual_stack_dynamic_rtx, temp)
3126 || reg_mentioned_p (virtual_outgoing_args_rtx, temp))
3127 temp = copy_to_reg (temp);
3130 /* Make inhibit_defer_pop nonzero around the library call
3131 to force it to pop the bcopy-arguments right away. */
3133 #ifdef TARGET_MEM_FUNCTIONS
3134 emit_library_call (memcpy_libfunc, 0,
3135 VOIDmode, 3, temp, Pmode, XEXP (xinner, 0), Pmode,
3136 convert_to_mode (TYPE_MODE (sizetype),
3137 size, TREE_UNSIGNED (sizetype)),
3138 TYPE_MODE (sizetype));
3140 emit_library_call (bcopy_libfunc, 0,
3141 VOIDmode, 3, XEXP (xinner, 0), Pmode, temp, Pmode,
3142 convert_to_mode (TYPE_MODE (integer_type_node),
3144 TREE_UNSIGNED (integer_type_node)),
3145 TYPE_MODE (integer_type_node));
3150 else if (partial > 0)
3152 /* Scalar partly in registers. */
3154 int size = GET_MODE_SIZE (mode) / UNITS_PER_WORD;
3157 /* # words of start of argument
3158 that we must make space for but need not store. */
3159 int offset = partial % (PARM_BOUNDARY / BITS_PER_WORD);
3160 int args_offset = INTVAL (args_so_far);
3163 /* Push padding now if padding above and stack grows down,
3164 or if padding below and stack grows up.
3165 But if space already allocated, this has already been done. */
3166 if (extra && args_addr == 0
3167 && where_pad != none && where_pad != stack_direction)
3168 anti_adjust_stack (GEN_INT (extra));
3170 /* If we make space by pushing it, we might as well push
3171 the real data. Otherwise, we can leave OFFSET nonzero
3172 and leave the space uninitialized. */
3176 /* Now NOT_STACK gets the number of words that we don't need to
3177 allocate on the stack. */
3178 not_stack = partial - offset;
3180 /* If the partial register-part of the arg counts in its stack size,
3181 skip the part of stack space corresponding to the registers.
3182 Otherwise, start copying to the beginning of the stack space,
3183 by setting SKIP to 0. */
3184 skip = (reg_parm_stack_space == 0) ? 0 : not_stack;
3186 if (CONSTANT_P (x) && ! LEGITIMATE_CONSTANT_P (x))
3187 x = validize_mem (force_const_mem (mode, x));
3189 /* If X is a hard register in a non-integer mode, copy it into a pseudo;
3190 SUBREGs of such registers are not allowed. */
3191 if ((GET_CODE (x) == REG && REGNO (x) < FIRST_PSEUDO_REGISTER
3192 && GET_MODE_CLASS (GET_MODE (x)) != MODE_INT))
3193 x = copy_to_reg (x);
3195 /* Loop over all the words allocated on the stack for this arg. */
3196 /* We can do it by words, because any scalar bigger than a word
3197 has a size a multiple of a word. */
3198 #ifndef PUSH_ARGS_REVERSED
3199 for (i = not_stack; i < size; i++)
3201 for (i = size - 1; i >= not_stack; i--)
3203 if (i >= not_stack + offset)
3204 emit_push_insn (operand_subword_force (x, i, mode),
3205 word_mode, NULL_TREE, NULL_RTX, align, 0, NULL_RTX,
3207 GEN_INT (args_offset + ((i - not_stack + skip)
3209 reg_parm_stack_space, alignment_pad);
3214 rtx target = NULL_RTX;
3216 /* Push padding now if padding above and stack grows down,
3217 or if padding below and stack grows up.
3218 But if space already allocated, this has already been done. */
3219 if (extra && args_addr == 0
3220 && where_pad != none && where_pad != stack_direction)
3221 anti_adjust_stack (GEN_INT (extra));
3223 #ifdef PUSH_ROUNDING
3225 addr = gen_push_operand ();
3229 if (GET_CODE (args_so_far) == CONST_INT)
3231 = memory_address (mode,
3232 plus_constant (args_addr,
3233 INTVAL (args_so_far)));
3235 addr = memory_address (mode, gen_rtx_PLUS (Pmode, args_addr,
3240 emit_move_insn (gen_rtx_MEM (mode, addr), x);
3242 if (current_function_check_memory_usage && ! in_check_memory_usage)
3244 in_check_memory_usage = 1;
3246 target = get_push_address (GET_MODE_SIZE (mode));
3248 if (GET_CODE (x) == MEM && type && AGGREGATE_TYPE_P (type))
3249 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
3252 GEN_INT (GET_MODE_SIZE (mode)),
3253 TYPE_MODE (sizetype));
3255 emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3,
3257 GEN_INT (GET_MODE_SIZE (mode)),
3258 TYPE_MODE (sizetype),
3259 GEN_INT (MEMORY_USE_RW),
3260 TYPE_MODE (integer_type_node));
3261 in_check_memory_usage = 0;
3266 /* If part should go in registers, copy that part
3267 into the appropriate registers. Do this now, at the end,
3268 since mem-to-mem copies above may do function calls. */
3269 if (partial > 0 && reg != 0)
3271 /* Handle calls that pass values in multiple non-contiguous locations.
3272 The Irix 6 ABI has examples of this. */
3273 if (GET_CODE (reg) == PARALLEL)
3274 emit_group_load (reg, x, -1, align); /* ??? size? */
3276 move_block_to_reg (REGNO (reg), x, partial, mode);
3279 if (extra && args_addr == 0 && where_pad == stack_direction)
3280 anti_adjust_stack (GEN_INT (extra));
3283 anti_adjust_stack (alignment_pad);
3286 /* Expand an assignment that stores the value of FROM into TO.
3287 If WANT_VALUE is nonzero, return an rtx for the value of TO.
3288 (This may contain a QUEUED rtx;
3289 if the value is constant, this rtx is a constant.)
3290 Otherwise, the returned value is NULL_RTX.
3292 SUGGEST_REG is no longer actually used.
3293 It used to mean, copy the value through a register
3294 and return that register, if that is possible.
3295 We now use WANT_VALUE to decide whether to do this. */
3298 expand_assignment (to, from, want_value, suggest_reg)
3301 int suggest_reg ATTRIBUTE_UNUSED;
3303 register rtx to_rtx = 0;
3306 /* Don't crash if the lhs of the assignment was erroneous. */
3308 if (TREE_CODE (to) == ERROR_MARK)
3310 result = expand_expr (from, NULL_RTX, VOIDmode, 0);
3311 return want_value ? result : NULL_RTX;
3314 /* Assignment of a structure component needs special treatment
3315 if the structure component's rtx is not simply a MEM.
3316 Assignment of an array element at a constant index, and assignment of
3317 an array element in an unaligned packed structure field, has the same
3320 if (TREE_CODE (to) == COMPONENT_REF || TREE_CODE (to) == BIT_FIELD_REF
3321 || TREE_CODE (to) == ARRAY_REF)
3323 enum machine_mode mode1;
3330 unsigned int alignment;
3333 tem = get_inner_reference (to, &bitsize, &bitpos, &offset, &mode1,
3334 &unsignedp, &volatilep, &alignment);
3336 /* If we are going to use store_bit_field and extract_bit_field,
3337 make sure to_rtx will be safe for multiple use. */
3339 if (mode1 == VOIDmode && want_value)
3340 tem = stabilize_reference (tem);
3342 to_rtx = expand_expr (tem, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_DONT);
3345 rtx offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, 0);
3347 if (GET_CODE (to_rtx) != MEM)
3350 if (GET_MODE (offset_rtx) != ptr_mode)
3352 #ifdef POINTERS_EXTEND_UNSIGNED
3353 offset_rtx = convert_memory_address (ptr_mode, offset_rtx);
3355 offset_rtx = convert_to_mode (ptr_mode, offset_rtx, 0);
3359 /* A constant address in TO_RTX can have VOIDmode, we must not try
3360 to call force_reg for that case. Avoid that case. */
3361 if (GET_CODE (to_rtx) == MEM
3362 && GET_MODE (to_rtx) == BLKmode
3363 && GET_MODE (XEXP (to_rtx, 0)) != VOIDmode
3365 && (bitpos % bitsize) == 0
3366 && (bitsize % GET_MODE_ALIGNMENT (mode1)) == 0
3367 && (alignment * BITS_PER_UNIT) == GET_MODE_ALIGNMENT (mode1))
3369 rtx temp = change_address (to_rtx, mode1,
3370 plus_constant (XEXP (to_rtx, 0),
3373 if (GET_CODE (XEXP (temp, 0)) == REG)
3376 to_rtx = change_address (to_rtx, mode1,
3377 force_reg (GET_MODE (XEXP (temp, 0)),
3382 to_rtx = change_address (to_rtx, VOIDmode,
3383 gen_rtx_PLUS (ptr_mode, XEXP (to_rtx, 0),
3384 force_reg (ptr_mode,
3390 if (GET_CODE (to_rtx) == MEM)
3392 /* When the offset is zero, to_rtx is the address of the
3393 structure we are storing into, and hence may be shared.
3394 We must make a new MEM before setting the volatile bit. */
3396 to_rtx = copy_rtx (to_rtx);
3398 MEM_VOLATILE_P (to_rtx) = 1;
3400 #if 0 /* This was turned off because, when a field is volatile
3401 in an object which is not volatile, the object may be in a register,
3402 and then we would abort over here. */
3408 if (TREE_CODE (to) == COMPONENT_REF
3409 && TREE_READONLY (TREE_OPERAND (to, 1)))
3412 to_rtx = copy_rtx (to_rtx);
3414 RTX_UNCHANGING_P (to_rtx) = 1;
3417 /* Check the access. */
3418 if (current_function_check_memory_usage && GET_CODE (to_rtx) == MEM)
3423 enum machine_mode best_mode;
3425 best_mode = get_best_mode (bitsize, bitpos,
3426 TYPE_ALIGN (TREE_TYPE (tem)),
3428 if (best_mode == VOIDmode)
3431 best_mode_size = GET_MODE_BITSIZE (best_mode);
3432 to_addr = plus_constant (XEXP (to_rtx, 0), (bitpos / BITS_PER_UNIT));
3433 size = CEIL ((bitpos % best_mode_size) + bitsize, best_mode_size);
3434 size *= GET_MODE_SIZE (best_mode);
3436 /* Check the access right of the pointer. */
3438 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
3440 GEN_INT (size), TYPE_MODE (sizetype),
3441 GEN_INT (MEMORY_USE_WO),
3442 TYPE_MODE (integer_type_node));
3445 result = store_field (to_rtx, bitsize, bitpos, mode1, from,
3447 /* Spurious cast makes HPUX compiler happy. */
3448 ? (enum machine_mode) TYPE_MODE (TREE_TYPE (to))
3451 /* Required alignment of containing datum. */
3453 int_size_in_bytes (TREE_TYPE (tem)),
3454 get_alias_set (to));
3455 preserve_temp_slots (result);
3459 /* If the value is meaningful, convert RESULT to the proper mode.
3460 Otherwise, return nothing. */
3461 return (want_value ? convert_modes (TYPE_MODE (TREE_TYPE (to)),
3462 TYPE_MODE (TREE_TYPE (from)),
3464 TREE_UNSIGNED (TREE_TYPE (to)))
3468 /* If the rhs is a function call and its value is not an aggregate,
3469 call the function before we start to compute the lhs.
3470 This is needed for correct code for cases such as
3471 val = setjmp (buf) on machines where reference to val
3472 requires loading up part of an address in a separate insn.
3474 Don't do this if TO is a VAR_DECL whose DECL_RTL is REG since it might be
3475 a promoted variable where the zero- or sign- extension needs to be done.
3476 Handling this in the normal way is safe because no computation is done
3478 if (TREE_CODE (from) == CALL_EXPR && ! aggregate_value_p (from)
3479 && TREE_CODE (TYPE_SIZE (TREE_TYPE (from))) == INTEGER_CST
3480 && ! (TREE_CODE (to) == VAR_DECL && GET_CODE (DECL_RTL (to)) == REG))
3485 value = expand_expr (from, NULL_RTX, VOIDmode, 0);
3487 to_rtx = expand_expr (to, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_WO);
3489 /* Handle calls that return values in multiple non-contiguous locations.
3490 The Irix 6 ABI has examples of this. */
3491 if (GET_CODE (to_rtx) == PARALLEL)
3492 emit_group_load (to_rtx, value, int_size_in_bytes (TREE_TYPE (from)),
3493 TYPE_ALIGN (TREE_TYPE (from)) / BITS_PER_UNIT);
3494 else if (GET_MODE (to_rtx) == BLKmode)
3495 emit_block_move (to_rtx, value, expr_size (from),
3496 TYPE_ALIGN (TREE_TYPE (from)) / BITS_PER_UNIT);
3499 #ifdef POINTERS_EXTEND_UNSIGNED
3500 if (TREE_CODE (TREE_TYPE (to)) == REFERENCE_TYPE
3501 || TREE_CODE (TREE_TYPE (to)) == POINTER_TYPE)
3502 value = convert_memory_address (GET_MODE (to_rtx), value);
3504 emit_move_insn (to_rtx, value);
3506 preserve_temp_slots (to_rtx);
3509 return want_value ? to_rtx : NULL_RTX;
3512 /* Ordinary treatment. Expand TO to get a REG or MEM rtx.
3513 Don't re-expand if it was expanded already (in COMPONENT_REF case). */
3517 to_rtx = expand_expr (to, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_WO);
3518 if (GET_CODE (to_rtx) == MEM)
3519 MEM_ALIAS_SET (to_rtx) = get_alias_set (to);
3522 /* Don't move directly into a return register. */
3523 if (TREE_CODE (to) == RESULT_DECL
3524 && (GET_CODE (to_rtx) == REG || GET_CODE (to_rtx) == PARALLEL))
3529 temp = expand_expr (from, 0, GET_MODE (to_rtx), 0);
3531 if (GET_CODE (to_rtx) == PARALLEL)
3532 emit_group_load (to_rtx, temp, int_size_in_bytes (TREE_TYPE (from)),
3533 TYPE_ALIGN (TREE_TYPE (from)) / BITS_PER_UNIT);
3535 emit_move_insn (to_rtx, temp);
3537 preserve_temp_slots (to_rtx);
3540 return want_value ? to_rtx : NULL_RTX;
3543 /* In case we are returning the contents of an object which overlaps
3544 the place the value is being stored, use a safe function when copying
3545 a value through a pointer into a structure value return block. */
3546 if (TREE_CODE (to) == RESULT_DECL && TREE_CODE (from) == INDIRECT_REF
3547 && current_function_returns_struct
3548 && !current_function_returns_pcc_struct)
3553 size = expr_size (from);
3554 from_rtx = expand_expr (from, NULL_RTX, VOIDmode,
3555 EXPAND_MEMORY_USE_DONT);
3557 /* Copy the rights of the bitmap. */
3558 if (current_function_check_memory_usage)
3559 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
3560 XEXP (to_rtx, 0), Pmode,
3561 XEXP (from_rtx, 0), Pmode,
3562 convert_to_mode (TYPE_MODE (sizetype),
3563 size, TREE_UNSIGNED (sizetype)),
3564 TYPE_MODE (sizetype));
3566 #ifdef TARGET_MEM_FUNCTIONS
3567 emit_library_call (memcpy_libfunc, 0,
3568 VOIDmode, 3, XEXP (to_rtx, 0), Pmode,
3569 XEXP (from_rtx, 0), Pmode,
3570 convert_to_mode (TYPE_MODE (sizetype),
3571 size, TREE_UNSIGNED (sizetype)),
3572 TYPE_MODE (sizetype));
3574 emit_library_call (bcopy_libfunc, 0,
3575 VOIDmode, 3, XEXP (from_rtx, 0), Pmode,
3576 XEXP (to_rtx, 0), Pmode,
3577 convert_to_mode (TYPE_MODE (integer_type_node),
3578 size, TREE_UNSIGNED (integer_type_node)),
3579 TYPE_MODE (integer_type_node));
3582 preserve_temp_slots (to_rtx);
3585 return want_value ? to_rtx : NULL_RTX;
3588 /* Compute FROM and store the value in the rtx we got. */
3591 result = store_expr (from, to_rtx, want_value);
3592 preserve_temp_slots (result);
3595 return want_value ? result : NULL_RTX;
3598 /* Generate code for computing expression EXP,
3599 and storing the value into TARGET.
3600 TARGET may contain a QUEUED rtx.
3602 If WANT_VALUE is nonzero, return a copy of the value
3603 not in TARGET, so that we can be sure to use the proper
3604 value in a containing expression even if TARGET has something
3605 else stored in it. If possible, we copy the value through a pseudo
3606 and return that pseudo. Or, if the value is constant, we try to
3607 return the constant. In some cases, we return a pseudo
3608 copied *from* TARGET.
3610 If the mode is BLKmode then we may return TARGET itself.
3611 It turns out that in BLKmode it doesn't cause a problem.
3612 because C has no operators that could combine two different
3613 assignments into the same BLKmode object with different values
3614 with no sequence point. Will other languages need this to
3617 If WANT_VALUE is 0, we return NULL, to make sure
3618 to catch quickly any cases where the caller uses the value
3619 and fails to set WANT_VALUE. */
3622 store_expr (exp, target, want_value)
3624 register rtx target;
3628 int dont_return_target = 0;
3630 if (TREE_CODE (exp) == COMPOUND_EXPR)
3632 /* Perform first part of compound expression, then assign from second
3634 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0);
3636 return store_expr (TREE_OPERAND (exp, 1), target, want_value);
3638 else if (TREE_CODE (exp) == COND_EXPR && GET_MODE (target) == BLKmode)
3640 /* For conditional expression, get safe form of the target. Then
3641 test the condition, doing the appropriate assignment on either
3642 side. This avoids the creation of unnecessary temporaries.
3643 For non-BLKmode, it is more efficient not to do this. */
3645 rtx lab1 = gen_label_rtx (), lab2 = gen_label_rtx ();
3648 target = protect_from_queue (target, 1);
3650 do_pending_stack_adjust ();
3652 jumpifnot (TREE_OPERAND (exp, 0), lab1);
3653 start_cleanup_deferral ();
3654 store_expr (TREE_OPERAND (exp, 1), target, 0);
3655 end_cleanup_deferral ();
3657 emit_jump_insn (gen_jump (lab2));
3660 start_cleanup_deferral ();
3661 store_expr (TREE_OPERAND (exp, 2), target, 0);
3662 end_cleanup_deferral ();
3667 return want_value ? target : NULL_RTX;
3669 else if (queued_subexp_p (target))
3670 /* If target contains a postincrement, let's not risk
3671 using it as the place to generate the rhs. */
3673 if (GET_MODE (target) != BLKmode && GET_MODE (target) != VOIDmode)
3675 /* Expand EXP into a new pseudo. */
3676 temp = gen_reg_rtx (GET_MODE (target));
3677 temp = expand_expr (exp, temp, GET_MODE (target), 0);
3680 temp = expand_expr (exp, NULL_RTX, GET_MODE (target), 0);
3682 /* If target is volatile, ANSI requires accessing the value
3683 *from* the target, if it is accessed. So make that happen.
3684 In no case return the target itself. */
3685 if (! MEM_VOLATILE_P (target) && want_value)
3686 dont_return_target = 1;
3688 else if (want_value && GET_CODE (target) == MEM && ! MEM_VOLATILE_P (target)
3689 && GET_MODE (target) != BLKmode)
3690 /* If target is in memory and caller wants value in a register instead,
3691 arrange that. Pass TARGET as target for expand_expr so that,
3692 if EXP is another assignment, WANT_VALUE will be nonzero for it.
3693 We know expand_expr will not use the target in that case.
3694 Don't do this if TARGET is volatile because we are supposed
3695 to write it and then read it. */
3697 temp = expand_expr (exp, target, GET_MODE (target), 0);
3698 if (GET_MODE (temp) != BLKmode && GET_MODE (temp) != VOIDmode)
3699 temp = copy_to_reg (temp);
3700 dont_return_target = 1;
3702 else if (GET_CODE (target) == SUBREG && SUBREG_PROMOTED_VAR_P (target))
3703 /* If this is an scalar in a register that is stored in a wider mode
3704 than the declared mode, compute the result into its declared mode
3705 and then convert to the wider mode. Our value is the computed
3708 /* If we don't want a value, we can do the conversion inside EXP,
3709 which will often result in some optimizations. Do the conversion
3710 in two steps: first change the signedness, if needed, then
3711 the extend. But don't do this if the type of EXP is a subtype
3712 of something else since then the conversion might involve
3713 more than just converting modes. */
3714 if (! want_value && INTEGRAL_TYPE_P (TREE_TYPE (exp))
3715 && TREE_TYPE (TREE_TYPE (exp)) == 0)
3717 if (TREE_UNSIGNED (TREE_TYPE (exp))
3718 != SUBREG_PROMOTED_UNSIGNED_P (target))
3721 (signed_or_unsigned_type (SUBREG_PROMOTED_UNSIGNED_P (target),
3725 exp = convert (type_for_mode (GET_MODE (SUBREG_REG (target)),
3726 SUBREG_PROMOTED_UNSIGNED_P (target)),
3730 temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);
3732 /* If TEMP is a volatile MEM and we want a result value, make
3733 the access now so it gets done only once. Likewise if
3734 it contains TARGET. */
3735 if (GET_CODE (temp) == MEM && want_value
3736 && (MEM_VOLATILE_P (temp)
3737 || reg_mentioned_p (SUBREG_REG (target), XEXP (temp, 0))))
3738 temp = copy_to_reg (temp);
3740 /* If TEMP is a VOIDmode constant, use convert_modes to make
3741 sure that we properly convert it. */
3742 if (CONSTANT_P (temp) && GET_MODE (temp) == VOIDmode)
3743 temp = convert_modes (GET_MODE (SUBREG_REG (target)),
3744 TYPE_MODE (TREE_TYPE (exp)), temp,
3745 SUBREG_PROMOTED_UNSIGNED_P (target));
3747 convert_move (SUBREG_REG (target), temp,
3748 SUBREG_PROMOTED_UNSIGNED_P (target));
3750 /* If we promoted a constant, change the mode back down to match
3751 target. Otherwise, the caller might get confused by a result whose
3752 mode is larger than expected. */
3754 if (want_value && GET_MODE (temp) != GET_MODE (target)
3755 && GET_MODE (temp) != VOIDmode)
3757 temp = gen_rtx_SUBREG (GET_MODE (target), temp, 0);
3758 SUBREG_PROMOTED_VAR_P (temp) = 1;
3759 SUBREG_PROMOTED_UNSIGNED_P (temp)
3760 = SUBREG_PROMOTED_UNSIGNED_P (target);
3763 return want_value ? temp : NULL_RTX;
3767 temp = expand_expr (exp, target, GET_MODE (target), 0);
3768 /* Return TARGET if it's a specified hardware register.
3769 If TARGET is a volatile mem ref, either return TARGET
3770 or return a reg copied *from* TARGET; ANSI requires this.
3772 Otherwise, if TEMP is not TARGET, return TEMP
3773 if it is constant (for efficiency),
3774 or if we really want the correct value. */
3775 if (!(target && GET_CODE (target) == REG
3776 && REGNO (target) < FIRST_PSEUDO_REGISTER)
3777 && !(GET_CODE (target) == MEM && MEM_VOLATILE_P (target))
3778 && ! rtx_equal_p (temp, target)
3779 && (CONSTANT_P (temp) || want_value))
3780 dont_return_target = 1;
3783 /* If TEMP is a VOIDmode constant and the mode of the type of EXP is not
3784 the same as that of TARGET, adjust the constant. This is needed, for
3785 example, in case it is a CONST_DOUBLE and we want only a word-sized
3787 if (CONSTANT_P (temp) && GET_MODE (temp) == VOIDmode
3788 && TREE_CODE (exp) != ERROR_MARK
3789 && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp)))
3790 temp = convert_modes (GET_MODE (target), TYPE_MODE (TREE_TYPE (exp)),
3791 temp, TREE_UNSIGNED (TREE_TYPE (exp)));
3793 if (current_function_check_memory_usage
3794 && GET_CODE (target) == MEM
3795 && AGGREGATE_TYPE_P (TREE_TYPE (exp)))
3797 if (GET_CODE (temp) == MEM)
3798 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
3799 XEXP (target, 0), Pmode,
3800 XEXP (temp, 0), Pmode,
3801 expr_size (exp), TYPE_MODE (sizetype));
3803 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
3804 XEXP (target, 0), Pmode,
3805 expr_size (exp), TYPE_MODE (sizetype),
3806 GEN_INT (MEMORY_USE_WO),
3807 TYPE_MODE (integer_type_node));
3810 /* If value was not generated in the target, store it there.
3811 Convert the value to TARGET's type first if nec. */
3812 /* If TEMP and TARGET compare equal according to rtx_equal_p, but
3813 one or both of them are volatile memory refs, we have to distinguish
3815 - expand_expr has used TARGET. In this case, we must not generate
3816 another copy. This can be detected by TARGET being equal according
3818 - expand_expr has not used TARGET - that means that the source just
3819 happens to have the same RTX form. Since temp will have been created
3820 by expand_expr, it will compare unequal according to == .
3821 We must generate a copy in this case, to reach the correct number
3822 of volatile memory references. */
3824 if ((! rtx_equal_p (temp, target)
3825 || (temp != target && (side_effects_p (temp)
3826 || side_effects_p (target))))
3827 && TREE_CODE (exp) != ERROR_MARK)
3829 target = protect_from_queue (target, 1);
3830 if (GET_MODE (temp) != GET_MODE (target)
3831 && GET_MODE (temp) != VOIDmode)
3833 int unsignedp = TREE_UNSIGNED (TREE_TYPE (exp));
3834 if (dont_return_target)
3836 /* In this case, we will return TEMP,
3837 so make sure it has the proper mode.
3838 But don't forget to store the value into TARGET. */
3839 temp = convert_to_mode (GET_MODE (target), temp, unsignedp);
3840 emit_move_insn (target, temp);
3843 convert_move (target, temp, unsignedp);
3846 else if (GET_MODE (temp) == BLKmode && TREE_CODE (exp) == STRING_CST)
3848 /* Handle copying a string constant into an array.
3849 The string constant may be shorter than the array.
3850 So copy just the string's actual length, and clear the rest. */
3854 /* Get the size of the data type of the string,
3855 which is actually the size of the target. */
3856 size = expr_size (exp);
3857 if (GET_CODE (size) == CONST_INT
3858 && INTVAL (size) < TREE_STRING_LENGTH (exp))
3859 emit_block_move (target, temp, size,
3860 TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT);
3863 /* Compute the size of the data to copy from the string. */
3865 = size_binop (MIN_EXPR,
3866 make_tree (sizetype, size),
3867 size_int (TREE_STRING_LENGTH (exp)));
3868 rtx copy_size_rtx = expand_expr (copy_size, NULL_RTX,
3872 /* Copy that much. */
3873 emit_block_move (target, temp, copy_size_rtx,
3874 TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT);
3876 /* Figure out how much is left in TARGET that we have to clear.
3877 Do all calculations in ptr_mode. */
3879 addr = XEXP (target, 0);
3880 addr = convert_modes (ptr_mode, Pmode, addr, 1);
3882 if (GET_CODE (copy_size_rtx) == CONST_INT)
3884 addr = plus_constant (addr, TREE_STRING_LENGTH (exp));
3885 size = plus_constant (size, - TREE_STRING_LENGTH (exp));
3889 addr = force_reg (ptr_mode, addr);
3890 addr = expand_binop (ptr_mode, add_optab, addr,
3891 copy_size_rtx, NULL_RTX, 0,
3894 size = expand_binop (ptr_mode, sub_optab, size,
3895 copy_size_rtx, NULL_RTX, 0,
3898 label = gen_label_rtx ();
3899 emit_cmp_and_jump_insns (size, const0_rtx, LT, NULL_RTX,
3900 GET_MODE (size), 0, 0, label);
3903 if (size != const0_rtx)
3905 /* Be sure we can write on ADDR. */
3906 if (current_function_check_memory_usage)
3907 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
3909 size, TYPE_MODE (sizetype),
3910 GEN_INT (MEMORY_USE_WO),
3911 TYPE_MODE (integer_type_node));
3912 #ifdef TARGET_MEM_FUNCTIONS
3913 emit_library_call (memset_libfunc, 0, VOIDmode, 3,
3915 const0_rtx, TYPE_MODE (integer_type_node),
3916 convert_to_mode (TYPE_MODE (sizetype),
3918 TREE_UNSIGNED (sizetype)),
3919 TYPE_MODE (sizetype));
3921 emit_library_call (bzero_libfunc, 0, VOIDmode, 2,
3923 convert_to_mode (TYPE_MODE (integer_type_node),
3925 TREE_UNSIGNED (integer_type_node)),
3926 TYPE_MODE (integer_type_node));
3934 /* Handle calls that return values in multiple non-contiguous locations.
3935 The Irix 6 ABI has examples of this. */
3936 else if (GET_CODE (target) == PARALLEL)
3937 emit_group_load (target, temp, int_size_in_bytes (TREE_TYPE (exp)),
3938 TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT);
3939 else if (GET_MODE (temp) == BLKmode)
3940 emit_block_move (target, temp, expr_size (exp),
3941 TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT);
3943 emit_move_insn (target, temp);
3946 /* If we don't want a value, return NULL_RTX. */
3950 /* If we are supposed to return TEMP, do so as long as it isn't a MEM.
3951 ??? The latter test doesn't seem to make sense. */
3952 else if (dont_return_target && GET_CODE (temp) != MEM)
3955 /* Return TARGET itself if it is a hard register. */
3956 else if (want_value && GET_MODE (target) != BLKmode
3957 && ! (GET_CODE (target) == REG
3958 && REGNO (target) < FIRST_PSEUDO_REGISTER))
3959 return copy_to_reg (target);
3965 /* Return 1 if EXP just contains zeros. */
3973 switch (TREE_CODE (exp))
3977 case NON_LVALUE_EXPR:
3978 return is_zeros_p (TREE_OPERAND (exp, 0));
3981 return TREE_INT_CST_LOW (exp) == 0 && TREE_INT_CST_HIGH (exp) == 0;
3985 is_zeros_p (TREE_REALPART (exp)) && is_zeros_p (TREE_IMAGPART (exp));
3988 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (exp), dconst0);
3991 if (TREE_TYPE (exp) && TREE_CODE (TREE_TYPE (exp)) == SET_TYPE)
3992 return CONSTRUCTOR_ELTS (exp) == NULL_TREE;
3993 for (elt = CONSTRUCTOR_ELTS (exp); elt; elt = TREE_CHAIN (elt))
3994 if (! is_zeros_p (TREE_VALUE (elt)))
4004 /* Return 1 if EXP contains mostly (3/4) zeros. */
4007 mostly_zeros_p (exp)
4010 if (TREE_CODE (exp) == CONSTRUCTOR)
4012 int elts = 0, zeros = 0;
4013 tree elt = CONSTRUCTOR_ELTS (exp);
4014 if (TREE_TYPE (exp) && TREE_CODE (TREE_TYPE (exp)) == SET_TYPE)
4016 /* If there are no ranges of true bits, it is all zero. */
4017 return elt == NULL_TREE;
4019 for (; elt; elt = TREE_CHAIN (elt))
4021 /* We do not handle the case where the index is a RANGE_EXPR,
4022 so the statistic will be somewhat inaccurate.
4023 We do make a more accurate count in store_constructor itself,
4024 so since this function is only used for nested array elements,
4025 this should be close enough. */
4026 if (mostly_zeros_p (TREE_VALUE (elt)))
4031 return 4 * zeros >= 3 * elts;
4034 return is_zeros_p (exp);
4037 /* Helper function for store_constructor.
4038 TARGET, BITSIZE, BITPOS, MODE, EXP are as for store_field.
4039 TYPE is the type of the CONSTRUCTOR, not the element type.
4040 ALIGN and CLEARED are as for store_constructor.
4042 This provides a recursive shortcut back to store_constructor when it isn't
4043 necessary to go through store_field. This is so that we can pass through
4044 the cleared field to let store_constructor know that we may not have to
4045 clear a substructure if the outer structure has already been cleared. */
4048 store_constructor_field (target, bitsize, bitpos,
4049 mode, exp, type, align, cleared)
4051 int bitsize, bitpos;
4052 enum machine_mode mode;
4057 if (TREE_CODE (exp) == CONSTRUCTOR
4058 && bitpos % BITS_PER_UNIT == 0
4059 /* If we have a non-zero bitpos for a register target, then we just
4060 let store_field do the bitfield handling. This is unlikely to
4061 generate unnecessary clear instructions anyways. */
4062 && (bitpos == 0 || GET_CODE (target) == MEM))
4066 = change_address (target,
4067 GET_MODE (target) == BLKmode
4069 % GET_MODE_ALIGNMENT (GET_MODE (target)))
4070 ? BLKmode : VOIDmode,
4071 plus_constant (XEXP (target, 0),
4072 bitpos / BITS_PER_UNIT));
4073 store_constructor (exp, target, align, cleared, bitsize / BITS_PER_UNIT);
4076 store_field (target, bitsize, bitpos, mode, exp, VOIDmode, 0,
4077 (align + BITS_PER_UNIT - 1) / BITS_PER_UNIT,
4078 int_size_in_bytes (type), 0);
4081 /* Store the value of constructor EXP into the rtx TARGET.
4082 TARGET is either a REG or a MEM.
4083 ALIGN is the maximum known alignment for TARGET, in bits.
4084 CLEARED is true if TARGET is known to have been zero'd.
4085 SIZE is the number of bytes of TARGET we are allowed to modify: this
4086 may not be the same as the size of EXP if we are assigning to a field
4087 which has been packed to exclude padding bits. */
4090 store_constructor (exp, target, align, cleared, size)
4097 tree type = TREE_TYPE (exp);
4098 #ifdef WORD_REGISTER_OPERATIONS
4099 rtx exp_size = expr_size (exp);
4102 /* We know our target cannot conflict, since safe_from_p has been called. */
4104 /* Don't try copying piece by piece into a hard register
4105 since that is vulnerable to being clobbered by EXP.
4106 Instead, construct in a pseudo register and then copy it all. */
4107 if (GET_CODE (target) == REG && REGNO (target) < FIRST_PSEUDO_REGISTER)
4109 rtx temp = gen_reg_rtx (GET_MODE (target));
4110 store_constructor (exp, temp, align, cleared, size);
4111 emit_move_insn (target, temp);
4116 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4117 || TREE_CODE (type) == QUAL_UNION_TYPE)
4121 /* Inform later passes that the whole union value is dead. */
4122 if ((TREE_CODE (type) == UNION_TYPE
4123 || TREE_CODE (type) == QUAL_UNION_TYPE)
4126 emit_insn (gen_rtx_CLOBBER (VOIDmode, target));
4128 /* If the constructor is empty, clear the union. */
4129 if (! CONSTRUCTOR_ELTS (exp) && ! cleared)
4130 clear_storage (target, expr_size (exp),
4131 TYPE_ALIGN (type) / BITS_PER_UNIT);
4134 /* If we are building a static constructor into a register,
4135 set the initial value as zero so we can fold the value into
4136 a constant. But if more than one register is involved,
4137 this probably loses. */
4138 else if (GET_CODE (target) == REG && TREE_STATIC (exp)
4139 && GET_MODE_SIZE (GET_MODE (target)) <= UNITS_PER_WORD)
4142 emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
4147 /* If the constructor has fewer fields than the structure
4148 or if we are initializing the structure to mostly zeros,
4149 clear the whole structure first. */
4151 && ((list_length (CONSTRUCTOR_ELTS (exp))
4152 != list_length (TYPE_FIELDS (type)))
4153 || mostly_zeros_p (exp)))
4156 clear_storage (target, GEN_INT (size),
4157 (align + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
4162 /* Inform later passes that the old value is dead. */
4163 emit_insn (gen_rtx_CLOBBER (VOIDmode, target));
4165 /* Store each element of the constructor into
4166 the corresponding field of TARGET. */
4168 for (elt = CONSTRUCTOR_ELTS (exp); elt; elt = TREE_CHAIN (elt))
4170 register tree field = TREE_PURPOSE (elt);
4171 #ifdef WORD_REGISTER_OPERATIONS
4172 tree value = TREE_VALUE (elt);
4174 register enum machine_mode mode;
4178 tree pos, constant = 0, offset = 0;
4179 rtx to_rtx = target;
4181 /* Just ignore missing fields.
4182 We cleared the whole structure, above,
4183 if any fields are missing. */
4187 if (cleared && is_zeros_p (TREE_VALUE (elt)))
4190 if (TREE_CODE (DECL_SIZE (field)) == INTEGER_CST)
4191 bitsize = TREE_INT_CST_LOW (DECL_SIZE (field));
4195 unsignedp = TREE_UNSIGNED (field);
4196 mode = DECL_MODE (field);
4197 if (DECL_BIT_FIELD (field))
4200 pos = DECL_FIELD_BITPOS (field);
4201 if (TREE_CODE (pos) == INTEGER_CST)
4203 else if (TREE_CODE (pos) == PLUS_EXPR
4204 && TREE_CODE (TREE_OPERAND (pos, 1)) == INTEGER_CST)
4205 constant = TREE_OPERAND (pos, 1), offset = TREE_OPERAND (pos, 0);
4210 bitpos = TREE_INT_CST_LOW (constant);
4216 if (contains_placeholder_p (offset))
4217 offset = build (WITH_RECORD_EXPR, bitsizetype,
4218 offset, make_tree (TREE_TYPE (exp), target));
4220 offset = size_binop (EXACT_DIV_EXPR, offset,
4221 bitsize_int (BITS_PER_UNIT));
4222 offset = convert (sizetype, offset);
4224 offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, 0);
4225 if (GET_CODE (to_rtx) != MEM)
4228 if (GET_MODE (offset_rtx) != ptr_mode)
4230 #ifdef POINTERS_EXTEND_UNSIGNED
4231 offset_rtx = convert_memory_address (ptr_mode, offset_rtx);
4233 offset_rtx = convert_to_mode (ptr_mode, offset_rtx, 0);
4238 = change_address (to_rtx, VOIDmode,
4239 gen_rtx_PLUS (ptr_mode, XEXP (to_rtx, 0),
4240 force_reg (ptr_mode,
4244 if (TREE_READONLY (field))
4246 if (GET_CODE (to_rtx) == MEM)
4247 to_rtx = copy_rtx (to_rtx);
4249 RTX_UNCHANGING_P (to_rtx) = 1;
4252 #ifdef WORD_REGISTER_OPERATIONS
4253 /* If this initializes a field that is smaller than a word, at the
4254 start of a word, try to widen it to a full word.
4255 This special case allows us to output C++ member function
4256 initializations in a form that the optimizers can understand. */
4258 && GET_CODE (target) == REG
4259 && bitsize < BITS_PER_WORD
4260 && bitpos % BITS_PER_WORD == 0
4261 && GET_MODE_CLASS (mode) == MODE_INT
4262 && TREE_CODE (value) == INTEGER_CST
4263 && GET_CODE (exp_size) == CONST_INT
4264 && bitpos + BITS_PER_WORD <= INTVAL (exp_size) * BITS_PER_UNIT)
4266 tree type = TREE_TYPE (value);
4267 if (TYPE_PRECISION (type) < BITS_PER_WORD)
4269 type = type_for_size (BITS_PER_WORD, TREE_UNSIGNED (type));
4270 value = convert (type, value);
4272 if (BYTES_BIG_ENDIAN)
4274 = fold (build (LSHIFT_EXPR, type, value,
4275 build_int_2 (BITS_PER_WORD - bitsize, 0)));
4276 bitsize = BITS_PER_WORD;
4280 store_constructor_field (to_rtx, bitsize, bitpos, mode,
4281 TREE_VALUE (elt), type,
4283 DECL_ALIGN (TREE_PURPOSE (elt))),
4287 else if (TREE_CODE (type) == ARRAY_TYPE)
4292 tree domain = TYPE_DOMAIN (type);
4293 HOST_WIDE_INT minelt = TREE_INT_CST_LOW (TYPE_MIN_VALUE (domain));
4294 HOST_WIDE_INT maxelt = TREE_INT_CST_LOW (TYPE_MAX_VALUE (domain));
4295 tree elttype = TREE_TYPE (type);
4297 /* If the constructor has fewer elements than the array,
4298 clear the whole array first. Similarly if this is
4299 static constructor of a non-BLKmode object. */
4300 if (cleared || (GET_CODE (target) == REG && TREE_STATIC (exp)))
4304 HOST_WIDE_INT count = 0, zero_count = 0;
4306 /* This loop is a more accurate version of the loop in
4307 mostly_zeros_p (it handles RANGE_EXPR in an index).
4308 It is also needed to check for missing elements. */
4309 for (elt = CONSTRUCTOR_ELTS (exp);
4311 elt = TREE_CHAIN (elt))
4313 tree index = TREE_PURPOSE (elt);
4314 HOST_WIDE_INT this_node_count;
4315 if (index != NULL_TREE && TREE_CODE (index) == RANGE_EXPR)
4317 tree lo_index = TREE_OPERAND (index, 0);
4318 tree hi_index = TREE_OPERAND (index, 1);
4319 if (TREE_CODE (lo_index) != INTEGER_CST
4320 || TREE_CODE (hi_index) != INTEGER_CST)
4325 this_node_count = TREE_INT_CST_LOW (hi_index)
4326 - TREE_INT_CST_LOW (lo_index) + 1;
4329 this_node_count = 1;
4330 count += this_node_count;
4331 if (mostly_zeros_p (TREE_VALUE (elt)))
4332 zero_count += this_node_count;
4334 /* Clear the entire array first if there are any missing elements,
4335 or if the incidence of zero elements is >= 75%. */
4336 if (count < maxelt - minelt + 1
4337 || 4 * zero_count >= 3 * count)
4340 if (need_to_clear && size > 0)
4343 clear_storage (target, GEN_INT (size),
4344 (align + BITS_PER_UNIT - 1) / BITS_PER_UNIT);
4348 /* Inform later passes that the old value is dead. */
4349 emit_insn (gen_rtx_CLOBBER (VOIDmode, target));
4351 /* Store each element of the constructor into
4352 the corresponding element of TARGET, determined
4353 by counting the elements. */
4354 for (elt = CONSTRUCTOR_ELTS (exp), i = 0;
4356 elt = TREE_CHAIN (elt), i++)
4358 register enum machine_mode mode;
4362 tree value = TREE_VALUE (elt);
4363 unsigned int align = TYPE_ALIGN (TREE_TYPE (value));
4364 tree index = TREE_PURPOSE (elt);
4365 rtx xtarget = target;
4367 if (cleared && is_zeros_p (value))
4370 unsignedp = TREE_UNSIGNED (elttype);
4371 mode = TYPE_MODE (elttype);
4372 if (mode == BLKmode)
4374 if (TREE_CODE (TYPE_SIZE (elttype)) == INTEGER_CST
4375 && TREE_INT_CST_HIGH (TYPE_SIZE (elttype)) == 0)
4376 bitsize = TREE_INT_CST_LOW (TYPE_SIZE (elttype));
4381 bitsize = GET_MODE_BITSIZE (mode);
4383 if (index != NULL_TREE && TREE_CODE (index) == RANGE_EXPR)
4385 tree lo_index = TREE_OPERAND (index, 0);
4386 tree hi_index = TREE_OPERAND (index, 1);
4387 rtx index_r, pos_rtx, addr, hi_r, loop_top, loop_end;
4388 struct nesting *loop;
4389 HOST_WIDE_INT lo, hi, count;
4392 /* If the range is constant and "small", unroll the loop. */
4393 if (TREE_CODE (lo_index) == INTEGER_CST
4394 && TREE_CODE (hi_index) == INTEGER_CST
4395 && (lo = TREE_INT_CST_LOW (lo_index),
4396 hi = TREE_INT_CST_LOW (hi_index),
4397 count = hi - lo + 1,
4398 (GET_CODE (target) != MEM
4400 || (TREE_CODE (TYPE_SIZE (elttype)) == INTEGER_CST
4401 && TREE_INT_CST_LOW (TYPE_SIZE (elttype)) * count
4404 lo -= minelt; hi -= minelt;
4405 for (; lo <= hi; lo++)
4407 bitpos = lo * TREE_INT_CST_LOW (TYPE_SIZE (elttype));
4408 store_constructor_field (target, bitsize, bitpos, mode,
4409 value, type, align, cleared);
4414 hi_r = expand_expr (hi_index, NULL_RTX, VOIDmode, 0);
4415 loop_top = gen_label_rtx ();
4416 loop_end = gen_label_rtx ();
4418 unsignedp = TREE_UNSIGNED (domain);
4420 index = build_decl (VAR_DECL, NULL_TREE, domain);
4422 DECL_RTL (index) = index_r
4423 = gen_reg_rtx (promote_mode (domain, DECL_MODE (index),
4426 if (TREE_CODE (value) == SAVE_EXPR
4427 && SAVE_EXPR_RTL (value) == 0)
4429 /* Make sure value gets expanded once before the
4431 expand_expr (value, const0_rtx, VOIDmode, 0);
4434 store_expr (lo_index, index_r, 0);
4435 loop = expand_start_loop (0);
4437 /* Assign value to element index. */
4439 = convert (ssizetype,
4440 fold (build (MINUS_EXPR, TREE_TYPE (index),
4441 index, TYPE_MIN_VALUE (domain))));
4442 position = size_binop (MULT_EXPR, position,
4444 TYPE_SIZE_UNIT (elttype)));
4446 pos_rtx = expand_expr (position, 0, VOIDmode, 0);
4447 addr = gen_rtx_PLUS (Pmode, XEXP (target, 0), pos_rtx);
4448 xtarget = change_address (target, mode, addr);
4449 if (TREE_CODE (value) == CONSTRUCTOR)
4450 store_constructor (value, xtarget, align, cleared,
4451 bitsize / BITS_PER_UNIT);
4453 store_expr (value, xtarget, 0);
4455 expand_exit_loop_if_false (loop,
4456 build (LT_EXPR, integer_type_node,
4459 expand_increment (build (PREINCREMENT_EXPR,
4461 index, integer_one_node), 0, 0);
4463 emit_label (loop_end);
4466 else if ((index != 0 && TREE_CODE (index) != INTEGER_CST)
4467 || TREE_CODE (TYPE_SIZE (elttype)) != INTEGER_CST)
4473 index = ssize_int (1);
4476 index = convert (ssizetype,
4477 fold (build (MINUS_EXPR, index,
4478 TYPE_MIN_VALUE (domain))));
4479 position = size_binop (MULT_EXPR, index,
4481 TYPE_SIZE_UNIT (elttype)));
4482 pos_rtx = expand_expr (position, 0, VOIDmode, 0);
4483 addr = gen_rtx_PLUS (Pmode, XEXP (target, 0), pos_rtx);
4484 xtarget = change_address (target, mode, addr);
4485 store_expr (value, xtarget, 0);
4490 bitpos = ((TREE_INT_CST_LOW (index) - minelt)
4491 * TREE_INT_CST_LOW (TYPE_SIZE (elttype)));
4493 bitpos = (i * TREE_INT_CST_LOW (TYPE_SIZE (elttype)));
4494 store_constructor_field (target, bitsize, bitpos, mode, value,
4495 type, align, cleared);
4499 /* set constructor assignments */
4500 else if (TREE_CODE (type) == SET_TYPE)
4502 tree elt = CONSTRUCTOR_ELTS (exp);
4503 int nbytes = int_size_in_bytes (type), nbits;
4504 tree domain = TYPE_DOMAIN (type);
4505 tree domain_min, domain_max, bitlength;
4507 /* The default implementation strategy is to extract the constant
4508 parts of the constructor, use that to initialize the target,
4509 and then "or" in whatever non-constant ranges we need in addition.
4511 If a large set is all zero or all ones, it is
4512 probably better to set it using memset (if available) or bzero.
4513 Also, if a large set has just a single range, it may also be
4514 better to first clear all the first clear the set (using
4515 bzero/memset), and set the bits we want. */
4517 /* Check for all zeros. */
4518 if (elt == NULL_TREE && size > 0)
4521 clear_storage (target, GEN_INT (size),
4522 TYPE_ALIGN (type) / BITS_PER_UNIT);
4526 domain_min = convert (sizetype, TYPE_MIN_VALUE (domain));
4527 domain_max = convert (sizetype, TYPE_MAX_VALUE (domain));
4528 bitlength = size_binop (PLUS_EXPR,
4529 size_diffop (domain_max, domain_min),
4532 if (nbytes < 0 || TREE_CODE (bitlength) != INTEGER_CST)
4534 nbits = TREE_INT_CST_LOW (bitlength);
4536 /* For "small" sets, or "medium-sized" (up to 32 bytes) sets that
4537 are "complicated" (more than one range), initialize (the
4538 constant parts) by copying from a constant. */
4539 if (GET_MODE (target) != BLKmode || nbits <= 2 * BITS_PER_WORD
4540 || (nbytes <= 32 && TREE_CHAIN (elt) != NULL_TREE))
4542 int set_word_size = TYPE_ALIGN (TREE_TYPE (exp));
4543 enum machine_mode mode = mode_for_size (set_word_size, MODE_INT, 1);
4544 char *bit_buffer = (char *) alloca (nbits);
4545 HOST_WIDE_INT word = 0;
4548 int offset = 0; /* In bytes from beginning of set. */
4549 elt = get_set_constructor_bits (exp, bit_buffer, nbits);
4552 if (bit_buffer[ibit])
4554 if (BYTES_BIG_ENDIAN)
4555 word |= (1 << (set_word_size - 1 - bit_pos));
4557 word |= 1 << bit_pos;
4560 if (bit_pos >= set_word_size || ibit == nbits)
4562 if (word != 0 || ! cleared)
4564 rtx datum = GEN_INT (word);
4566 /* The assumption here is that it is safe to use
4567 XEXP if the set is multi-word, but not if
4568 it's single-word. */
4569 if (GET_CODE (target) == MEM)
4571 to_rtx = plus_constant (XEXP (target, 0), offset);
4572 to_rtx = change_address (target, mode, to_rtx);
4574 else if (offset == 0)
4578 emit_move_insn (to_rtx, datum);
4584 offset += set_word_size / BITS_PER_UNIT;
4590 /* Don't bother clearing storage if the set is all ones. */
4591 if (TREE_CHAIN (elt) != NULL_TREE
4592 || (TREE_PURPOSE (elt) == NULL_TREE
4594 : (TREE_CODE (TREE_VALUE (elt)) != INTEGER_CST
4595 || TREE_CODE (TREE_PURPOSE (elt)) != INTEGER_CST
4596 || (TREE_INT_CST_LOW (TREE_VALUE (elt))
4597 - TREE_INT_CST_LOW (TREE_PURPOSE (elt)) + 1
4599 clear_storage (target, expr_size (exp),
4600 TYPE_ALIGN (type) / BITS_PER_UNIT);
4603 for (; elt != NULL_TREE; elt = TREE_CHAIN (elt))
4605 /* start of range of element or NULL */
4606 tree startbit = TREE_PURPOSE (elt);
4607 /* end of range of element, or element value */
4608 tree endbit = TREE_VALUE (elt);
4609 #ifdef TARGET_MEM_FUNCTIONS
4610 HOST_WIDE_INT startb, endb;
4612 rtx bitlength_rtx, startbit_rtx, endbit_rtx, targetx;
4614 bitlength_rtx = expand_expr (bitlength,
4615 NULL_RTX, MEM, EXPAND_CONST_ADDRESS);
4617 /* handle non-range tuple element like [ expr ] */
4618 if (startbit == NULL_TREE)
4620 startbit = save_expr (endbit);
4623 startbit = convert (sizetype, startbit);
4624 endbit = convert (sizetype, endbit);
4625 if (! integer_zerop (domain_min))
4627 startbit = size_binop (MINUS_EXPR, startbit, domain_min);
4628 endbit = size_binop (MINUS_EXPR, endbit, domain_min);
4630 startbit_rtx = expand_expr (startbit, NULL_RTX, MEM,
4631 EXPAND_CONST_ADDRESS);
4632 endbit_rtx = expand_expr (endbit, NULL_RTX, MEM,
4633 EXPAND_CONST_ADDRESS);
4637 targetx = assign_stack_temp (GET_MODE (target),
4638 GET_MODE_SIZE (GET_MODE (target)),
4640 emit_move_insn (targetx, target);
4642 else if (GET_CODE (target) == MEM)
4647 #ifdef TARGET_MEM_FUNCTIONS
4648 /* Optimization: If startbit and endbit are
4649 constants divisible by BITS_PER_UNIT,
4650 call memset instead. */
4651 if (TREE_CODE (startbit) == INTEGER_CST
4652 && TREE_CODE (endbit) == INTEGER_CST
4653 && (startb = TREE_INT_CST_LOW (startbit)) % BITS_PER_UNIT == 0
4654 && (endb = TREE_INT_CST_LOW (endbit) + 1) % BITS_PER_UNIT == 0)
4656 emit_library_call (memset_libfunc, 0,
4658 plus_constant (XEXP (targetx, 0),
4659 startb / BITS_PER_UNIT),
4661 constm1_rtx, TYPE_MODE (integer_type_node),
4662 GEN_INT ((endb - startb) / BITS_PER_UNIT),
4663 TYPE_MODE (sizetype));
4668 emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__setbits"),
4669 0, VOIDmode, 4, XEXP (targetx, 0), Pmode,
4670 bitlength_rtx, TYPE_MODE (sizetype),
4671 startbit_rtx, TYPE_MODE (sizetype),
4672 endbit_rtx, TYPE_MODE (sizetype));
4675 emit_move_insn (target, targetx);
4683 /* Store the value of EXP (an expression tree)
4684 into a subfield of TARGET which has mode MODE and occupies
4685 BITSIZE bits, starting BITPOS bits from the start of TARGET.
4686 If MODE is VOIDmode, it means that we are storing into a bit-field.
4688 If VALUE_MODE is VOIDmode, return nothing in particular.
4689 UNSIGNEDP is not used in this case.
4691 Otherwise, return an rtx for the value stored. This rtx
4692 has mode VALUE_MODE if that is convenient to do.
4693 In this case, UNSIGNEDP must be nonzero if the value is an unsigned type.
4695 ALIGN is the alignment that TARGET is known to have, measured in bytes.
4696 TOTAL_SIZE is the size in bytes of the structure, or -1 if varying.
4698 ALIAS_SET is the alias set for the destination. This value will
4699 (in general) be different from that for TARGET, since TARGET is a
4700 reference to the containing structure. */
4703 store_field (target, bitsize, bitpos, mode, exp, value_mode,
4704 unsignedp, align, total_size, alias_set)
4706 int bitsize, bitpos;
4707 enum machine_mode mode;
4709 enum machine_mode value_mode;
4715 HOST_WIDE_INT width_mask = 0;
4717 if (TREE_CODE (exp) == ERROR_MARK)
4720 if (bitsize < HOST_BITS_PER_WIDE_INT)
4721 width_mask = ((HOST_WIDE_INT) 1 << bitsize) - 1;
4723 /* If we are storing into an unaligned field of an aligned union that is
4724 in a register, we may have the mode of TARGET being an integer mode but
4725 MODE == BLKmode. In that case, get an aligned object whose size and
4726 alignment are the same as TARGET and store TARGET into it (we can avoid
4727 the store if the field being stored is the entire width of TARGET). Then
4728 call ourselves recursively to store the field into a BLKmode version of
4729 that object. Finally, load from the object into TARGET. This is not
4730 very efficient in general, but should only be slightly more expensive
4731 than the otherwise-required unaligned accesses. Perhaps this can be
4732 cleaned up later. */
4735 && (GET_CODE (target) == REG || GET_CODE (target) == SUBREG))
4737 rtx object = assign_stack_temp (GET_MODE (target),
4738 GET_MODE_SIZE (GET_MODE (target)), 0);
4739 rtx blk_object = copy_rtx (object);
4741 MEM_SET_IN_STRUCT_P (object, 1);
4742 MEM_SET_IN_STRUCT_P (blk_object, 1);
4743 PUT_MODE (blk_object, BLKmode);
4745 if (bitsize != GET_MODE_BITSIZE (GET_MODE (target)))
4746 emit_move_insn (object, target);
4748 store_field (blk_object, bitsize, bitpos, mode, exp, VOIDmode, 0,
4749 align, total_size, alias_set);
4751 /* Even though we aren't returning target, we need to
4752 give it the updated value. */
4753 emit_move_insn (target, object);
4758 /* If the structure is in a register or if the component
4759 is a bit field, we cannot use addressing to access it.
4760 Use bit-field techniques or SUBREG to store in it. */
4762 if (mode == VOIDmode
4763 || (mode != BLKmode && ! direct_store[(int) mode]
4764 && GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
4765 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT)
4766 || GET_CODE (target) == REG
4767 || GET_CODE (target) == SUBREG
4768 /* If the field isn't aligned enough to store as an ordinary memref,
4769 store it as a bit field. */
4770 || (mode != BLKmode && SLOW_UNALIGNED_ACCESS (mode, align)
4771 && (align * BITS_PER_UNIT < GET_MODE_ALIGNMENT (mode)
4772 || bitpos % GET_MODE_ALIGNMENT (mode)))
4773 || (mode == BLKmode && SLOW_UNALIGNED_ACCESS (mode, align)
4774 && (TYPE_ALIGN (TREE_TYPE (exp)) > align * BITS_PER_UNIT
4775 || bitpos % TYPE_ALIGN (TREE_TYPE (exp)) != 0))
4776 /* If the RHS and field are a constant size and the size of the
4777 RHS isn't the same size as the bitfield, we must use bitfield
4780 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) == INTEGER_CST)
4781 && (TREE_INT_CST_HIGH (TYPE_SIZE (TREE_TYPE (exp))) != 0
4782 || TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (exp))) != bitsize)))
4784 rtx temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);
4786 /* If BITSIZE is narrower than the size of the type of EXP
4787 we will be narrowing TEMP. Normally, what's wanted are the
4788 low-order bits. However, if EXP's type is a record and this is
4789 big-endian machine, we want the upper BITSIZE bits. */
4790 if (BYTES_BIG_ENDIAN && GET_MODE_CLASS (GET_MODE (temp)) == MODE_INT
4791 && bitsize < GET_MODE_BITSIZE (GET_MODE (temp))
4792 && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE)
4793 temp = expand_shift (RSHIFT_EXPR, GET_MODE (temp), temp,
4794 size_int (GET_MODE_BITSIZE (GET_MODE (temp))
4798 /* Unless MODE is VOIDmode or BLKmode, convert TEMP to
4800 if (mode != VOIDmode && mode != BLKmode
4801 && mode != TYPE_MODE (TREE_TYPE (exp)))
4802 temp = convert_modes (mode, TYPE_MODE (TREE_TYPE (exp)), temp, 1);
4804 /* If the modes of TARGET and TEMP are both BLKmode, both
4805 must be in memory and BITPOS must be aligned on a byte
4806 boundary. If so, we simply do a block copy. */
4807 if (GET_MODE (target) == BLKmode && GET_MODE (temp) == BLKmode)
4809 unsigned int exp_align = expr_align (exp) / BITS_PER_UNIT;
4811 if (GET_CODE (target) != MEM || GET_CODE (temp) != MEM
4812 || bitpos % BITS_PER_UNIT != 0)
4815 target = change_address (target, VOIDmode,
4816 plus_constant (XEXP (target, 0),
4817 bitpos / BITS_PER_UNIT));
4819 /* Make sure that ALIGN is no stricter than the alignment of EXP. */
4820 align = MIN (exp_align, align);
4822 /* Find an alignment that is consistent with the bit position. */
4823 while ((bitpos % (align * BITS_PER_UNIT)) != 0)
4826 emit_block_move (target, temp,
4827 GEN_INT ((bitsize + BITS_PER_UNIT - 1)
4831 return value_mode == VOIDmode ? const0_rtx : target;
4834 /* Store the value in the bitfield. */
4835 store_bit_field (target, bitsize, bitpos, mode, temp, align, total_size);
4836 if (value_mode != VOIDmode)
4838 /* The caller wants an rtx for the value. */
4839 /* If possible, avoid refetching from the bitfield itself. */
4841 && ! (GET_CODE (target) == MEM && MEM_VOLATILE_P (target)))
4844 enum machine_mode tmode;
4847 return expand_and (temp, GEN_INT (width_mask), NULL_RTX);
4848 tmode = GET_MODE (temp);
4849 if (tmode == VOIDmode)
4851 count = build_int_2 (GET_MODE_BITSIZE (tmode) - bitsize, 0);
4852 temp = expand_shift (LSHIFT_EXPR, tmode, temp, count, 0, 0);
4853 return expand_shift (RSHIFT_EXPR, tmode, temp, count, 0, 0);
4855 return extract_bit_field (target, bitsize, bitpos, unsignedp,
4856 NULL_RTX, value_mode, 0, align,
4863 rtx addr = XEXP (target, 0);
4866 /* If a value is wanted, it must be the lhs;
4867 so make the address stable for multiple use. */
4869 if (value_mode != VOIDmode && GET_CODE (addr) != REG
4870 && ! CONSTANT_ADDRESS_P (addr)
4871 /* A frame-pointer reference is already stable. */
4872 && ! (GET_CODE (addr) == PLUS
4873 && GET_CODE (XEXP (addr, 1)) == CONST_INT
4874 && (XEXP (addr, 0) == virtual_incoming_args_rtx
4875 || XEXP (addr, 0) == virtual_stack_vars_rtx)))
4876 addr = copy_to_reg (addr);
4878 /* Now build a reference to just the desired component. */
4880 to_rtx = copy_rtx (change_address (target, mode,
4881 plus_constant (addr,
4883 / BITS_PER_UNIT))));
4884 MEM_SET_IN_STRUCT_P (to_rtx, 1);
4885 MEM_ALIAS_SET (to_rtx) = alias_set;
4887 return store_expr (exp, to_rtx, value_mode != VOIDmode);
4891 /* Given an expression EXP that may be a COMPONENT_REF, a BIT_FIELD_REF,
4892 or an ARRAY_REF, look for nested COMPONENT_REFs, BIT_FIELD_REFs, or
4893 ARRAY_REFs and find the ultimate containing object, which we return.
4895 We set *PBITSIZE to the size in bits that we want, *PBITPOS to the
4896 bit position, and *PUNSIGNEDP to the signedness of the field.
4897 If the position of the field is variable, we store a tree
4898 giving the variable offset (in units) in *POFFSET.
4899 This offset is in addition to the bit position.
4900 If the position is not variable, we store 0 in *POFFSET.
4901 We set *PALIGNMENT to the alignment in bytes of the address that will be
4902 computed. This is the alignment of the thing we return if *POFFSET
4903 is zero, but can be more less strictly aligned if *POFFSET is nonzero.
4905 If any of the extraction expressions is volatile,
4906 we store 1 in *PVOLATILEP. Otherwise we don't change that.
4908 If the field is a bit-field, *PMODE is set to VOIDmode. Otherwise, it
4909 is a mode that can be used to access the field. In that case, *PBITSIZE
4912 If the field describes a variable-sized object, *PMODE is set to
4913 VOIDmode and *PBITSIZE is set to -1. An access cannot be made in
4914 this case, but the address of the object can be found. */
4917 get_inner_reference (exp, pbitsize, pbitpos, poffset, pmode,
4918 punsignedp, pvolatilep, palignment)
4923 enum machine_mode *pmode;
4926 unsigned int *palignment;
4928 tree orig_exp = exp;
4930 enum machine_mode mode = VOIDmode;
4931 tree offset = size_zero_node;
4932 unsigned int alignment = BIGGEST_ALIGNMENT;
4934 if (TREE_CODE (exp) == COMPONENT_REF)
4936 size_tree = DECL_SIZE (TREE_OPERAND (exp, 1));
4937 if (! DECL_BIT_FIELD (TREE_OPERAND (exp, 1)))
4938 mode = DECL_MODE (TREE_OPERAND (exp, 1));
4939 *punsignedp = TREE_UNSIGNED (TREE_OPERAND (exp, 1));
4941 else if (TREE_CODE (exp) == BIT_FIELD_REF)
4943 size_tree = TREE_OPERAND (exp, 1);
4944 *punsignedp = TREE_UNSIGNED (exp);
4948 mode = TYPE_MODE (TREE_TYPE (exp));
4949 if (mode == BLKmode)
4950 size_tree = TYPE_SIZE (TREE_TYPE (exp));
4952 *pbitsize = GET_MODE_BITSIZE (mode);
4953 *punsignedp = TREE_UNSIGNED (TREE_TYPE (exp));
4958 if (TREE_CODE (size_tree) != INTEGER_CST)
4959 mode = BLKmode, *pbitsize = -1;
4961 *pbitsize = TREE_INT_CST_LOW (size_tree);
4964 /* Compute cumulative bit-offset for nested component-refs and array-refs,
4965 and find the ultimate containing object. */
4971 if (TREE_CODE (exp) == COMPONENT_REF || TREE_CODE (exp) == BIT_FIELD_REF)
4973 tree pos = (TREE_CODE (exp) == COMPONENT_REF
4974 ? DECL_FIELD_BITPOS (TREE_OPERAND (exp, 1))
4975 : TREE_OPERAND (exp, 2));
4976 tree constant = bitsize_int (0), var = pos;
4978 /* If this field hasn't been filled in yet, don't go
4979 past it. This should only happen when folding expressions
4980 made during type construction. */
4984 /* Assume here that the offset is a multiple of a unit.
4985 If not, there should be an explicitly added constant. */
4986 if (TREE_CODE (pos) == PLUS_EXPR
4987 && TREE_CODE (TREE_OPERAND (pos, 1)) == INTEGER_CST)
4988 constant = TREE_OPERAND (pos, 1), var = TREE_OPERAND (pos, 0);
4989 else if (TREE_CODE (pos) == INTEGER_CST)
4990 constant = pos, var = bitsize_int (0);
4992 *pbitpos += TREE_INT_CST_LOW (constant);
4994 = size_binop (PLUS_EXPR, offset,
4996 size_binop (EXACT_DIV_EXPR, var,
4997 bitsize_int (BITS_PER_UNIT))));
5000 else if (TREE_CODE (exp) == ARRAY_REF)
5002 /* This code is based on the code in case ARRAY_REF in expand_expr
5003 below. We assume here that the size of an array element is
5004 always an integral multiple of BITS_PER_UNIT. */
5006 tree index = TREE_OPERAND (exp, 1);
5007 tree domain = TYPE_DOMAIN (TREE_TYPE (TREE_OPERAND (exp, 0)));
5009 = domain ? TYPE_MIN_VALUE (domain) : integer_zero_node;
5010 tree index_type = TREE_TYPE (index);
5013 if (TYPE_PRECISION (index_type) != TYPE_PRECISION (sizetype))
5015 index = convert (type_for_size (TYPE_PRECISION (sizetype), 0),
5017 index_type = TREE_TYPE (index);
5020 /* Optimize the special-case of a zero lower bound.
5022 We convert the low_bound to sizetype to avoid some problems
5023 with constant folding. (E.g. suppose the lower bound is 1,
5024 and its mode is QI. Without the conversion, (ARRAY
5025 +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1))
5026 +INDEX), which becomes (ARRAY+255+INDEX). Oops!)
5028 But sizetype isn't quite right either (especially if
5029 the lowbound is negative). FIXME */
5031 if (! integer_zerop (low_bound))
5032 index = fold (build (MINUS_EXPR, index_type, index,
5033 convert (sizetype, low_bound)));
5035 if (TREE_CODE (index) == INTEGER_CST)
5037 index = convert (sbitsizetype, index);
5038 index_type = TREE_TYPE (index);
5041 xindex = fold (build (MULT_EXPR, sbitsizetype, index,
5042 convert (sbitsizetype,
5043 TYPE_SIZE (TREE_TYPE (exp)))));
5045 if (TREE_CODE (xindex) == INTEGER_CST
5046 && TREE_INT_CST_HIGH (xindex) == 0)
5047 *pbitpos += TREE_INT_CST_LOW (xindex);
5050 /* Either the bit offset calculated above is not constant, or
5051 it overflowed. In either case, redo the multiplication
5052 against the size in units. This is especially important
5053 in the non-constant case to avoid a division at runtime. */
5055 = fold (build (MULT_EXPR, ssizetype, index,
5057 TYPE_SIZE_UNIT (TREE_TYPE (exp)))));
5059 if (contains_placeholder_p (xindex))
5060 xindex = build (WITH_RECORD_EXPR, ssizetype, xindex, exp);
5063 = size_binop (PLUS_EXPR, offset, convert (sizetype, xindex));
5066 else if (TREE_CODE (exp) != NON_LVALUE_EXPR
5067 && ! ((TREE_CODE (exp) == NOP_EXPR
5068 || TREE_CODE (exp) == CONVERT_EXPR)
5069 && (TYPE_MODE (TREE_TYPE (exp))
5070 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))))
5073 /* If any reference in the chain is volatile, the effect is volatile. */
5074 if (TREE_THIS_VOLATILE (exp))
5077 /* If the offset is non-constant already, then we can't assume any
5078 alignment more than the alignment here. */
5079 if (! integer_zerop (offset))
5080 alignment = MIN (alignment, TYPE_ALIGN (TREE_TYPE (exp)));
5082 exp = TREE_OPERAND (exp, 0);
5085 if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'd')
5086 alignment = MIN (alignment, DECL_ALIGN (exp));
5087 else if (TREE_TYPE (exp) != 0)
5088 alignment = MIN (alignment, TYPE_ALIGN (TREE_TYPE (exp)));
5090 if (integer_zerop (offset))
5093 if (offset != 0 && contains_placeholder_p (offset))
5094 offset = build (WITH_RECORD_EXPR, sizetype, offset, orig_exp);
5098 *palignment = alignment / BITS_PER_UNIT;
5102 /* Subroutine of expand_exp: compute memory_usage from modifier. */
5103 static enum memory_use_mode
5104 get_memory_usage_from_modifier (modifier)
5105 enum expand_modifier modifier;
5111 return MEMORY_USE_RO;
5113 case EXPAND_MEMORY_USE_WO:
5114 return MEMORY_USE_WO;
5116 case EXPAND_MEMORY_USE_RW:
5117 return MEMORY_USE_RW;
5119 case EXPAND_MEMORY_USE_DONT:
5120 /* EXPAND_CONST_ADDRESS and EXPAND_INITIALIZER are converted into
5121 MEMORY_USE_DONT, because they are modifiers to a call of
5122 expand_expr in the ADDR_EXPR case of expand_expr. */
5123 case EXPAND_CONST_ADDRESS:
5124 case EXPAND_INITIALIZER:
5125 return MEMORY_USE_DONT;
5126 case EXPAND_MEMORY_USE_BAD:
5132 /* Given an rtx VALUE that may contain additions and multiplications,
5133 return an equivalent value that just refers to a register or memory.
5134 This is done by generating instructions to perform the arithmetic
5135 and returning a pseudo-register containing the value.
5137 The returned value may be a REG, SUBREG, MEM or constant. */
5140 force_operand (value, target)
5143 register optab binoptab = 0;
5144 /* Use a temporary to force order of execution of calls to
5148 /* Use subtarget as the target for operand 0 of a binary operation. */
5149 register rtx subtarget = (target != 0 && GET_CODE (target) == REG ? target : 0);
5151 /* Check for a PIC address load. */
5153 && (GET_CODE (value) == PLUS || GET_CODE (value) == MINUS)
5154 && XEXP (value, 0) == pic_offset_table_rtx
5155 && (GET_CODE (XEXP (value, 1)) == SYMBOL_REF
5156 || GET_CODE (XEXP (value, 1)) == LABEL_REF
5157 || GET_CODE (XEXP (value, 1)) == CONST))
5160 subtarget = gen_reg_rtx (GET_MODE (value));
5161 emit_move_insn (subtarget, value);
5165 if (GET_CODE (value) == PLUS)
5166 binoptab = add_optab;
5167 else if (GET_CODE (value) == MINUS)
5168 binoptab = sub_optab;
5169 else if (GET_CODE (value) == MULT)
5171 op2 = XEXP (value, 1);
5172 if (!CONSTANT_P (op2)
5173 && !(GET_CODE (op2) == REG && op2 != subtarget))
5175 tmp = force_operand (XEXP (value, 0), subtarget);
5176 return expand_mult (GET_MODE (value), tmp,
5177 force_operand (op2, NULL_RTX),
5183 op2 = XEXP (value, 1);
5184 if (!CONSTANT_P (op2)
5185 && !(GET_CODE (op2) == REG && op2 != subtarget))
5187 if (binoptab == sub_optab && GET_CODE (op2) == CONST_INT)
5189 binoptab = add_optab;
5190 op2 = negate_rtx (GET_MODE (value), op2);
5193 /* Check for an addition with OP2 a constant integer and our first
5194 operand a PLUS of a virtual register and something else. In that
5195 case, we want to emit the sum of the virtual register and the
5196 constant first and then add the other value. This allows virtual
5197 register instantiation to simply modify the constant rather than
5198 creating another one around this addition. */
5199 if (binoptab == add_optab && GET_CODE (op2) == CONST_INT
5200 && GET_CODE (XEXP (value, 0)) == PLUS
5201 && GET_CODE (XEXP (XEXP (value, 0), 0)) == REG
5202 && REGNO (XEXP (XEXP (value, 0), 0)) >= FIRST_VIRTUAL_REGISTER
5203 && REGNO (XEXP (XEXP (value, 0), 0)) <= LAST_VIRTUAL_REGISTER)
5205 rtx temp = expand_binop (GET_MODE (value), binoptab,
5206 XEXP (XEXP (value, 0), 0), op2,
5207 subtarget, 0, OPTAB_LIB_WIDEN);
5208 return expand_binop (GET_MODE (value), binoptab, temp,
5209 force_operand (XEXP (XEXP (value, 0), 1), 0),
5210 target, 0, OPTAB_LIB_WIDEN);
5213 tmp = force_operand (XEXP (value, 0), subtarget);
5214 return expand_binop (GET_MODE (value), binoptab, tmp,
5215 force_operand (op2, NULL_RTX),
5216 target, 0, OPTAB_LIB_WIDEN);
5217 /* We give UNSIGNEDP = 0 to expand_binop
5218 because the only operations we are expanding here are signed ones. */
5223 /* Subroutine of expand_expr:
5224 save the non-copied parts (LIST) of an expr (LHS), and return a list
5225 which can restore these values to their previous values,
5226 should something modify their storage. */
5229 save_noncopied_parts (lhs, list)
5236 for (tail = list; tail; tail = TREE_CHAIN (tail))
5237 if (TREE_CODE (TREE_VALUE (tail)) == TREE_LIST)
5238 parts = chainon (parts, save_noncopied_parts (lhs, TREE_VALUE (tail)));
5241 tree part = TREE_VALUE (tail);
5242 tree part_type = TREE_TYPE (part);
5243 tree to_be_saved = build (COMPONENT_REF, part_type, lhs, part);
5244 rtx target = assign_temp (part_type, 0, 1, 1);
5245 if (! memory_address_p (TYPE_MODE (part_type), XEXP (target, 0)))
5246 target = change_address (target, TYPE_MODE (part_type), NULL_RTX);
5247 parts = tree_cons (to_be_saved,
5248 build (RTL_EXPR, part_type, NULL_TREE,
5251 store_expr (TREE_PURPOSE (parts), RTL_EXPR_RTL (TREE_VALUE (parts)), 0);
5256 /* Subroutine of expand_expr:
5257 record the non-copied parts (LIST) of an expr (LHS), and return a list
5258 which specifies the initial values of these parts. */
5261 init_noncopied_parts (lhs, list)
5268 for (tail = list; tail; tail = TREE_CHAIN (tail))
5269 if (TREE_CODE (TREE_VALUE (tail)) == TREE_LIST)
5270 parts = chainon (parts, init_noncopied_parts (lhs, TREE_VALUE (tail)));
5271 else if (TREE_PURPOSE (tail))
5273 tree part = TREE_VALUE (tail);
5274 tree part_type = TREE_TYPE (part);
5275 tree to_be_initialized = build (COMPONENT_REF, part_type, lhs, part);
5276 parts = tree_cons (TREE_PURPOSE (tail), to_be_initialized, parts);
5281 /* Subroutine of expand_expr: return nonzero iff there is no way that
5282 EXP can reference X, which is being modified. TOP_P is nonzero if this
5283 call is going to be used to determine whether we need a temporary
5284 for EXP, as opposed to a recursive call to this function.
5286 It is always safe for this routine to return zero since it merely
5287 searches for optimization opportunities. */
5290 safe_from_p (x, exp, top_p)
5297 static int save_expr_count;
5298 static int save_expr_size = 0;
5299 static tree *save_expr_rewritten;
5300 static tree save_expr_trees[256];
5303 /* If EXP has varying size, we MUST use a target since we currently
5304 have no way of allocating temporaries of variable size
5305 (except for arrays that have TYPE_ARRAY_MAX_SIZE set).
5306 So we assume here that something at a higher level has prevented a
5307 clash. This is somewhat bogus, but the best we can do. Only
5308 do this when X is BLKmode and when we are at the top level. */
5309 || (top_p && TREE_TYPE (exp) != 0 && TYPE_SIZE (TREE_TYPE (exp)) != 0
5310 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) != INTEGER_CST
5311 && (TREE_CODE (TREE_TYPE (exp)) != ARRAY_TYPE
5312 || TYPE_ARRAY_MAX_SIZE (TREE_TYPE (exp)) == NULL_TREE
5313 || TREE_CODE (TYPE_ARRAY_MAX_SIZE (TREE_TYPE (exp)))
5315 && GET_MODE (x) == BLKmode))
5318 if (top_p && save_expr_size == 0)
5322 save_expr_count = 0;
5323 save_expr_size = sizeof (save_expr_trees) / sizeof (save_expr_trees[0]);
5324 save_expr_rewritten = &save_expr_trees[0];
5326 rtn = safe_from_p (x, exp, 1);
5328 for (i = 0; i < save_expr_count; ++i)
5330 if (TREE_CODE (save_expr_trees[i]) != ERROR_MARK)
5332 TREE_SET_CODE (save_expr_trees[i], SAVE_EXPR);
5340 /* If this is a subreg of a hard register, declare it unsafe, otherwise,
5341 find the underlying pseudo. */
5342 if (GET_CODE (x) == SUBREG)
5345 if (GET_CODE (x) == REG && REGNO (x) < FIRST_PSEUDO_REGISTER)
5349 /* If X is a location in the outgoing argument area, it is always safe. */
5350 if (GET_CODE (x) == MEM
5351 && (XEXP (x, 0) == virtual_outgoing_args_rtx
5352 || (GET_CODE (XEXP (x, 0)) == PLUS
5353 && XEXP (XEXP (x, 0), 0) == virtual_outgoing_args_rtx)))
5356 switch (TREE_CODE_CLASS (TREE_CODE (exp)))
5359 exp_rtl = DECL_RTL (exp);
5366 if (TREE_CODE (exp) == TREE_LIST)
5367 return ((TREE_VALUE (exp) == 0
5368 || safe_from_p (x, TREE_VALUE (exp), 0))
5369 && (TREE_CHAIN (exp) == 0
5370 || safe_from_p (x, TREE_CHAIN (exp), 0)));
5371 else if (TREE_CODE (exp) == ERROR_MARK)
5372 return 1; /* An already-visited SAVE_EXPR? */
5377 return safe_from_p (x, TREE_OPERAND (exp, 0), 0);
5381 return (safe_from_p (x, TREE_OPERAND (exp, 0), 0)
5382 && safe_from_p (x, TREE_OPERAND (exp, 1), 0));
5386 /* Now do code-specific tests. EXP_RTL is set to any rtx we find in
5387 the expression. If it is set, we conflict iff we are that rtx or
5388 both are in memory. Otherwise, we check all operands of the
5389 expression recursively. */
5391 switch (TREE_CODE (exp))
5394 return (staticp (TREE_OPERAND (exp, 0))
5395 || safe_from_p (x, TREE_OPERAND (exp, 0), 0)
5396 || TREE_STATIC (exp));
5399 if (GET_CODE (x) == MEM)
5404 exp_rtl = CALL_EXPR_RTL (exp);
5407 /* Assume that the call will clobber all hard registers and
5409 if ((GET_CODE (x) == REG && REGNO (x) < FIRST_PSEUDO_REGISTER)
5410 || GET_CODE (x) == MEM)
5417 /* If a sequence exists, we would have to scan every instruction
5418 in the sequence to see if it was safe. This is probably not
5420 if (RTL_EXPR_SEQUENCE (exp))
5423 exp_rtl = RTL_EXPR_RTL (exp);
5426 case WITH_CLEANUP_EXPR:
5427 exp_rtl = RTL_EXPR_RTL (exp);
5430 case CLEANUP_POINT_EXPR:
5431 return safe_from_p (x, TREE_OPERAND (exp, 0), 0);
5434 exp_rtl = SAVE_EXPR_RTL (exp);
5438 /* This SAVE_EXPR might appear many times in the top-level
5439 safe_from_p() expression, and if it has a complex
5440 subexpression, examining it multiple times could result
5441 in a combinatorial explosion. E.g. on an Alpha
5442 running at least 200MHz, a Fortran test case compiled with
5443 optimization took about 28 minutes to compile -- even though
5444 it was only a few lines long, and the complicated line causing
5445 so much time to be spent in the earlier version of safe_from_p()
5446 had only 293 or so unique nodes.
5448 So, turn this SAVE_EXPR into an ERROR_MARK for now, but remember
5449 where it is so we can turn it back in the top-level safe_from_p()
5452 /* For now, don't bother re-sizing the array. */
5453 if (save_expr_count >= save_expr_size)
5455 save_expr_rewritten[save_expr_count++] = exp;
5457 nops = tree_code_length[(int) SAVE_EXPR];
5458 for (i = 0; i < nops; i++)
5460 tree operand = TREE_OPERAND (exp, i);
5461 if (operand == NULL_TREE)
5463 TREE_SET_CODE (exp, ERROR_MARK);
5464 if (!safe_from_p (x, operand, 0))
5466 TREE_SET_CODE (exp, SAVE_EXPR);
5468 TREE_SET_CODE (exp, ERROR_MARK);
5472 /* The only operand we look at is operand 1. The rest aren't
5473 part of the expression. */
5474 return safe_from_p (x, TREE_OPERAND (exp, 1), 0);
5476 case METHOD_CALL_EXPR:
5477 /* This takes a rtx argument, but shouldn't appear here. */
5484 /* If we have an rtx, we do not need to scan our operands. */
5488 nops = tree_code_length[(int) TREE_CODE (exp)];
5489 for (i = 0; i < nops; i++)
5490 if (TREE_OPERAND (exp, i) != 0
5491 && ! safe_from_p (x, TREE_OPERAND (exp, i), 0))
5495 /* If we have an rtl, find any enclosed object. Then see if we conflict
5499 if (GET_CODE (exp_rtl) == SUBREG)
5501 exp_rtl = SUBREG_REG (exp_rtl);
5502 if (GET_CODE (exp_rtl) == REG
5503 && REGNO (exp_rtl) < FIRST_PSEUDO_REGISTER)
5507 /* If the rtl is X, then it is not safe. Otherwise, it is unless both
5508 are memory and EXP is not readonly. */
5509 return ! (rtx_equal_p (x, exp_rtl)
5510 || (GET_CODE (x) == MEM && GET_CODE (exp_rtl) == MEM
5511 && ! TREE_READONLY (exp)));
5514 /* If we reach here, it is safe. */
5518 /* Subroutine of expand_expr: return nonzero iff EXP is an
5519 expression whose type is statically determinable. */
5525 if (TREE_CODE (exp) == PARM_DECL
5526 || TREE_CODE (exp) == VAR_DECL
5527 || TREE_CODE (exp) == CALL_EXPR || TREE_CODE (exp) == TARGET_EXPR
5528 || TREE_CODE (exp) == COMPONENT_REF
5529 || TREE_CODE (exp) == ARRAY_REF)
5534 /* Subroutine of expand_expr: return rtx if EXP is a
5535 variable or parameter; else return 0. */
5542 switch (TREE_CODE (exp))
5546 return DECL_RTL (exp);
5552 #ifdef MAX_INTEGER_COMPUTATION_MODE
5554 check_max_integer_computation_mode (exp)
5557 enum tree_code code;
5558 enum machine_mode mode;
5560 /* Strip any NOPs that don't change the mode. */
5562 code = TREE_CODE (exp);
5564 /* We must allow conversions of constants to MAX_INTEGER_COMPUTATION_MODE. */
5565 if (code == NOP_EXPR
5566 && TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST)
5569 /* First check the type of the overall operation. We need only look at
5570 unary, binary and relational operations. */
5571 if (TREE_CODE_CLASS (code) == '1'
5572 || TREE_CODE_CLASS (code) == '2'
5573 || TREE_CODE_CLASS (code) == '<')
5575 mode = TYPE_MODE (TREE_TYPE (exp));
5576 if (GET_MODE_CLASS (mode) == MODE_INT
5577 && mode > MAX_INTEGER_COMPUTATION_MODE)
5578 fatal ("unsupported wide integer operation");
5581 /* Check operand of a unary op. */
5582 if (TREE_CODE_CLASS (code) == '1')
5584 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
5585 if (GET_MODE_CLASS (mode) == MODE_INT
5586 && mode > MAX_INTEGER_COMPUTATION_MODE)
5587 fatal ("unsupported wide integer operation");
5590 /* Check operands of a binary/comparison op. */
5591 if (TREE_CODE_CLASS (code) == '2' || TREE_CODE_CLASS (code) == '<')
5593 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
5594 if (GET_MODE_CLASS (mode) == MODE_INT
5595 && mode > MAX_INTEGER_COMPUTATION_MODE)
5596 fatal ("unsupported wide integer operation");
5598 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 1)));
5599 if (GET_MODE_CLASS (mode) == MODE_INT
5600 && mode > MAX_INTEGER_COMPUTATION_MODE)
5601 fatal ("unsupported wide integer operation");
5607 /* Utility function used by expand_expr to see if TYPE, a RECORD_TYPE,
5608 has any readonly fields. If any of the fields have types that
5609 contain readonly fields, return true as well. */
5612 readonly_fields_p (type)
5617 for (field = TYPE_FIELDS (type); field != 0; field = TREE_CHAIN (field))
5618 if (TREE_CODE (field) == FIELD_DECL
5619 && (TREE_READONLY (field)
5620 || (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
5621 && readonly_fields_p (TREE_TYPE (field)))))
5627 /* expand_expr: generate code for computing expression EXP.
5628 An rtx for the computed value is returned. The value is never null.
5629 In the case of a void EXP, const0_rtx is returned.
5631 The value may be stored in TARGET if TARGET is nonzero.
5632 TARGET is just a suggestion; callers must assume that
5633 the rtx returned may not be the same as TARGET.
5635 If TARGET is CONST0_RTX, it means that the value will be ignored.
5637 If TMODE is not VOIDmode, it suggests generating the
5638 result in mode TMODE. But this is done only when convenient.
5639 Otherwise, TMODE is ignored and the value generated in its natural mode.
5640 TMODE is just a suggestion; callers must assume that
5641 the rtx returned may not have mode TMODE.
5643 Note that TARGET may have neither TMODE nor MODE. In that case, it
5644 probably will not be used.
5646 If MODIFIER is EXPAND_SUM then when EXP is an addition
5647 we can return an rtx of the form (MULT (REG ...) (CONST_INT ...))
5648 or a nest of (PLUS ...) and (MINUS ...) where the terms are
5649 products as above, or REG or MEM, or constant.
5650 Ordinarily in such cases we would output mul or add instructions
5651 and then return a pseudo reg containing the sum.
5653 EXPAND_INITIALIZER is much like EXPAND_SUM except that
5654 it also marks a label as absolutely required (it can't be dead).
5655 It also makes a ZERO_EXTEND or SIGN_EXTEND instead of emitting extend insns.
5656 This is used for outputting expressions used in initializers.
5658 EXPAND_CONST_ADDRESS says that it is okay to return a MEM
5659 with a constant address even if that address is not normally legitimate.
5660 EXPAND_INITIALIZER and EXPAND_SUM also have this effect. */
5663 expand_expr (exp, target, tmode, modifier)
5666 enum machine_mode tmode;
5667 enum expand_modifier modifier;
5669 register rtx op0, op1, temp;
5670 tree type = TREE_TYPE (exp);
5671 int unsignedp = TREE_UNSIGNED (type);
5672 register enum machine_mode mode;
5673 register enum tree_code code = TREE_CODE (exp);
5675 rtx subtarget, original_target;
5678 /* Used by check-memory-usage to make modifier read only. */
5679 enum expand_modifier ro_modifier;
5681 /* Handle ERROR_MARK before anybody tries to access its type. */
5682 if (TREE_CODE (exp) == ERROR_MARK)
5684 op0 = CONST0_RTX (tmode);
5690 mode = TYPE_MODE (type);
5691 /* Use subtarget as the target for operand 0 of a binary operation. */
5692 subtarget = (target != 0 && GET_CODE (target) == REG ? target : 0);
5693 original_target = target;
5694 ignore = (target == const0_rtx
5695 || ((code == NON_LVALUE_EXPR || code == NOP_EXPR
5696 || code == CONVERT_EXPR || code == REFERENCE_EXPR
5697 || code == COND_EXPR)
5698 && TREE_CODE (type) == VOID_TYPE));
5700 /* Make a read-only version of the modifier. */
5701 if (modifier == EXPAND_NORMAL || modifier == EXPAND_SUM
5702 || modifier == EXPAND_CONST_ADDRESS || modifier == EXPAND_INITIALIZER)
5703 ro_modifier = modifier;
5705 ro_modifier = EXPAND_NORMAL;
5707 /* Don't use hard regs as subtargets, because the combiner
5708 can only handle pseudo regs. */
5709 if (subtarget && REGNO (subtarget) < FIRST_PSEUDO_REGISTER)
5711 /* Avoid subtargets inside loops,
5712 since they hide some invariant expressions. */
5713 if (preserve_subexpressions_p ())
5716 /* If we are going to ignore this result, we need only do something
5717 if there is a side-effect somewhere in the expression. If there
5718 is, short-circuit the most common cases here. Note that we must
5719 not call expand_expr with anything but const0_rtx in case this
5720 is an initial expansion of a size that contains a PLACEHOLDER_EXPR. */
5724 if (! TREE_SIDE_EFFECTS (exp))
5727 /* Ensure we reference a volatile object even if value is ignored, but
5728 don't do this if all we are doing is taking its address. */
5729 if (TREE_THIS_VOLATILE (exp)
5730 && TREE_CODE (exp) != FUNCTION_DECL
5731 && mode != VOIDmode && mode != BLKmode
5732 && modifier != EXPAND_CONST_ADDRESS)
5734 temp = expand_expr (exp, NULL_RTX, VOIDmode, ro_modifier);
5735 if (GET_CODE (temp) == MEM)
5736 temp = copy_to_reg (temp);
5740 if (TREE_CODE_CLASS (code) == '1' || code == COMPONENT_REF
5741 || code == INDIRECT_REF || code == BUFFER_REF)
5742 return expand_expr (TREE_OPERAND (exp, 0), const0_rtx,
5743 VOIDmode, ro_modifier);
5744 else if (TREE_CODE_CLASS (code) == '2' || TREE_CODE_CLASS (code) == '<'
5745 || code == ARRAY_REF)
5747 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, ro_modifier);
5748 expand_expr (TREE_OPERAND (exp, 1), const0_rtx, VOIDmode, ro_modifier);
5751 else if ((code == TRUTH_ANDIF_EXPR || code == TRUTH_ORIF_EXPR)
5752 && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 1)))
5753 /* If the second operand has no side effects, just evaluate
5755 return expand_expr (TREE_OPERAND (exp, 0), const0_rtx,
5756 VOIDmode, ro_modifier);
5757 else if (code == BIT_FIELD_REF)
5759 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, ro_modifier);
5760 expand_expr (TREE_OPERAND (exp, 1), const0_rtx, VOIDmode, ro_modifier);
5761 expand_expr (TREE_OPERAND (exp, 2), const0_rtx, VOIDmode, ro_modifier);
5768 #ifdef MAX_INTEGER_COMPUTATION_MODE
5769 /* Only check stuff here if the mode we want is different from the mode
5770 of the expression; if it's the same, check_max_integer_computiation_mode
5771 will handle it. Do we really need to check this stuff at all? */
5774 && GET_MODE (target) != mode
5775 && TREE_CODE (exp) != INTEGER_CST
5776 && TREE_CODE (exp) != PARM_DECL
5777 && TREE_CODE (exp) != ARRAY_REF
5778 && TREE_CODE (exp) != COMPONENT_REF
5779 && TREE_CODE (exp) != BIT_FIELD_REF
5780 && TREE_CODE (exp) != INDIRECT_REF
5781 && TREE_CODE (exp) != CALL_EXPR
5782 && TREE_CODE (exp) != VAR_DECL
5783 && TREE_CODE (exp) != RTL_EXPR)
5785 enum machine_mode mode = GET_MODE (target);
5787 if (GET_MODE_CLASS (mode) == MODE_INT
5788 && mode > MAX_INTEGER_COMPUTATION_MODE)
5789 fatal ("unsupported wide integer operation");
5793 && TREE_CODE (exp) != INTEGER_CST
5794 && TREE_CODE (exp) != PARM_DECL
5795 && TREE_CODE (exp) != ARRAY_REF
5796 && TREE_CODE (exp) != COMPONENT_REF
5797 && TREE_CODE (exp) != BIT_FIELD_REF
5798 && TREE_CODE (exp) != INDIRECT_REF
5799 && TREE_CODE (exp) != VAR_DECL
5800 && TREE_CODE (exp) != CALL_EXPR
5801 && TREE_CODE (exp) != RTL_EXPR
5802 && GET_MODE_CLASS (tmode) == MODE_INT
5803 && tmode > MAX_INTEGER_COMPUTATION_MODE)
5804 fatal ("unsupported wide integer operation");
5806 check_max_integer_computation_mode (exp);
5809 /* If will do cse, generate all results into pseudo registers
5810 since 1) that allows cse to find more things
5811 and 2) otherwise cse could produce an insn the machine
5814 if (! cse_not_expected && mode != BLKmode && target
5815 && (GET_CODE (target) != REG || REGNO (target) < FIRST_PSEUDO_REGISTER))
5822 tree function = decl_function_context (exp);
5823 /* Handle using a label in a containing function. */
5824 if (function != current_function_decl
5825 && function != inline_function_decl && function != 0)
5827 struct function *p = find_function_data (function);
5828 /* Allocate in the memory associated with the function
5829 that the label is in. */
5830 push_obstacks (p->function_obstack,
5831 p->function_maybepermanent_obstack);
5833 p->expr->x_forced_labels
5834 = gen_rtx_EXPR_LIST (VOIDmode, label_rtx (exp),
5835 p->expr->x_forced_labels);
5840 if (modifier == EXPAND_INITIALIZER)
5841 forced_labels = gen_rtx_EXPR_LIST (VOIDmode,
5846 temp = gen_rtx_MEM (FUNCTION_MODE,
5847 gen_rtx_LABEL_REF (Pmode, label_rtx (exp)));
5848 if (function != current_function_decl
5849 && function != inline_function_decl && function != 0)
5850 LABEL_REF_NONLOCAL_P (XEXP (temp, 0)) = 1;
5855 if (DECL_RTL (exp) == 0)
5857 error_with_decl (exp, "prior parameter's size depends on `%s'");
5858 return CONST0_RTX (mode);
5861 /* ... fall through ... */
5864 /* If a static var's type was incomplete when the decl was written,
5865 but the type is complete now, lay out the decl now. */
5866 if (DECL_SIZE (exp) == 0 && TYPE_SIZE (TREE_TYPE (exp)) != 0
5867 && (TREE_STATIC (exp) || DECL_EXTERNAL (exp)))
5869 push_obstacks_nochange ();
5870 end_temporary_allocation ();
5871 layout_decl (exp, 0);
5872 PUT_MODE (DECL_RTL (exp), DECL_MODE (exp));
5876 /* Although static-storage variables start off initialized, according to
5877 ANSI C, a memcpy could overwrite them with uninitialized values. So
5878 we check them too. This also lets us check for read-only variables
5879 accessed via a non-const declaration, in case it won't be detected
5880 any other way (e.g., in an embedded system or OS kernel without
5883 Aggregates are not checked here; they're handled elsewhere. */
5884 if (cfun && current_function_check_memory_usage
5886 && GET_CODE (DECL_RTL (exp)) == MEM
5887 && ! AGGREGATE_TYPE_P (TREE_TYPE (exp)))
5889 enum memory_use_mode memory_usage;
5890 memory_usage = get_memory_usage_from_modifier (modifier);
5892 if (memory_usage != MEMORY_USE_DONT)
5893 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
5894 XEXP (DECL_RTL (exp), 0), Pmode,
5895 GEN_INT (int_size_in_bytes (type)),
5896 TYPE_MODE (sizetype),
5897 GEN_INT (memory_usage),
5898 TYPE_MODE (integer_type_node));
5901 /* ... fall through ... */
5905 if (DECL_RTL (exp) == 0)
5908 /* Ensure variable marked as used even if it doesn't go through
5909 a parser. If it hasn't be used yet, write out an external
5911 if (! TREE_USED (exp))
5913 assemble_external (exp);
5914 TREE_USED (exp) = 1;
5917 /* Show we haven't gotten RTL for this yet. */
5920 /* Handle variables inherited from containing functions. */
5921 context = decl_function_context (exp);
5923 /* We treat inline_function_decl as an alias for the current function
5924 because that is the inline function whose vars, types, etc.
5925 are being merged into the current function.
5926 See expand_inline_function. */
5928 if (context != 0 && context != current_function_decl
5929 && context != inline_function_decl
5930 /* If var is static, we don't need a static chain to access it. */
5931 && ! (GET_CODE (DECL_RTL (exp)) == MEM
5932 && CONSTANT_P (XEXP (DECL_RTL (exp), 0))))
5936 /* Mark as non-local and addressable. */
5937 DECL_NONLOCAL (exp) = 1;
5938 if (DECL_NO_STATIC_CHAIN (current_function_decl))
5940 mark_addressable (exp);
5941 if (GET_CODE (DECL_RTL (exp)) != MEM)
5943 addr = XEXP (DECL_RTL (exp), 0);
5944 if (GET_CODE (addr) == MEM)
5945 addr = gen_rtx_MEM (Pmode,
5946 fix_lexical_addr (XEXP (addr, 0), exp));
5948 addr = fix_lexical_addr (addr, exp);
5949 temp = change_address (DECL_RTL (exp), mode, addr);
5952 /* This is the case of an array whose size is to be determined
5953 from its initializer, while the initializer is still being parsed.
5956 else if (GET_CODE (DECL_RTL (exp)) == MEM
5957 && GET_CODE (XEXP (DECL_RTL (exp), 0)) == REG)
5958 temp = change_address (DECL_RTL (exp), GET_MODE (DECL_RTL (exp)),
5959 XEXP (DECL_RTL (exp), 0));
5961 /* If DECL_RTL is memory, we are in the normal case and either
5962 the address is not valid or it is not a register and -fforce-addr
5963 is specified, get the address into a register. */
5965 else if (GET_CODE (DECL_RTL (exp)) == MEM
5966 && modifier != EXPAND_CONST_ADDRESS
5967 && modifier != EXPAND_SUM
5968 && modifier != EXPAND_INITIALIZER
5969 && (! memory_address_p (DECL_MODE (exp),
5970 XEXP (DECL_RTL (exp), 0))
5972 && GET_CODE (XEXP (DECL_RTL (exp), 0)) != REG)))
5973 temp = change_address (DECL_RTL (exp), VOIDmode,
5974 copy_rtx (XEXP (DECL_RTL (exp), 0)));
5976 /* If we got something, return it. But first, set the alignment
5977 the address is a register. */
5980 if (GET_CODE (temp) == MEM && GET_CODE (XEXP (temp, 0)) == REG)
5981 mark_reg_pointer (XEXP (temp, 0),
5982 DECL_ALIGN (exp) / BITS_PER_UNIT);
5987 /* If the mode of DECL_RTL does not match that of the decl, it
5988 must be a promoted value. We return a SUBREG of the wanted mode,
5989 but mark it so that we know that it was already extended. */
5991 if (GET_CODE (DECL_RTL (exp)) == REG
5992 && GET_MODE (DECL_RTL (exp)) != mode)
5994 /* Get the signedness used for this variable. Ensure we get the
5995 same mode we got when the variable was declared. */
5996 if (GET_MODE (DECL_RTL (exp))
5997 != promote_mode (type, DECL_MODE (exp), &unsignedp, 0))
6000 temp = gen_rtx_SUBREG (mode, DECL_RTL (exp), 0);
6001 SUBREG_PROMOTED_VAR_P (temp) = 1;
6002 SUBREG_PROMOTED_UNSIGNED_P (temp) = unsignedp;
6006 return DECL_RTL (exp);
6009 return immed_double_const (TREE_INT_CST_LOW (exp),
6010 TREE_INT_CST_HIGH (exp),
6014 return expand_expr (DECL_INITIAL (exp), target, VOIDmode,
6015 EXPAND_MEMORY_USE_BAD);
6018 /* If optimized, generate immediate CONST_DOUBLE
6019 which will be turned into memory by reload if necessary.
6021 We used to force a register so that loop.c could see it. But
6022 this does not allow gen_* patterns to perform optimizations with
6023 the constants. It also produces two insns in cases like "x = 1.0;".
6024 On most machines, floating-point constants are not permitted in
6025 many insns, so we'd end up copying it to a register in any case.
6027 Now, we do the copying in expand_binop, if appropriate. */
6028 return immed_real_const (exp);
6032 if (! TREE_CST_RTL (exp))
6033 output_constant_def (exp);
6035 /* TREE_CST_RTL probably contains a constant address.
6036 On RISC machines where a constant address isn't valid,
6037 make some insns to get that address into a register. */
6038 if (GET_CODE (TREE_CST_RTL (exp)) == MEM
6039 && modifier != EXPAND_CONST_ADDRESS
6040 && modifier != EXPAND_INITIALIZER
6041 && modifier != EXPAND_SUM
6042 && (! memory_address_p (mode, XEXP (TREE_CST_RTL (exp), 0))
6044 && GET_CODE (XEXP (TREE_CST_RTL (exp), 0)) != REG)))
6045 return change_address (TREE_CST_RTL (exp), VOIDmode,
6046 copy_rtx (XEXP (TREE_CST_RTL (exp), 0)));
6047 return TREE_CST_RTL (exp);
6049 case EXPR_WITH_FILE_LOCATION:
6052 char *saved_input_filename = input_filename;
6053 int saved_lineno = lineno;
6054 input_filename = EXPR_WFL_FILENAME (exp);
6055 lineno = EXPR_WFL_LINENO (exp);
6056 if (EXPR_WFL_EMIT_LINE_NOTE (exp))
6057 emit_line_note (input_filename, lineno);
6058 /* Possibly avoid switching back and force here */
6059 to_return = expand_expr (EXPR_WFL_NODE (exp), target, tmode, modifier);
6060 input_filename = saved_input_filename;
6061 lineno = saved_lineno;
6066 context = decl_function_context (exp);
6068 /* If this SAVE_EXPR was at global context, assume we are an
6069 initialization function and move it into our context. */
6071 SAVE_EXPR_CONTEXT (exp) = current_function_decl;
6073 /* We treat inline_function_decl as an alias for the current function
6074 because that is the inline function whose vars, types, etc.
6075 are being merged into the current function.
6076 See expand_inline_function. */
6077 if (context == current_function_decl || context == inline_function_decl)
6080 /* If this is non-local, handle it. */
6083 /* The following call just exists to abort if the context is
6084 not of a containing function. */
6085 find_function_data (context);
6087 temp = SAVE_EXPR_RTL (exp);
6088 if (temp && GET_CODE (temp) == REG)
6090 put_var_into_stack (exp);
6091 temp = SAVE_EXPR_RTL (exp);
6093 if (temp == 0 || GET_CODE (temp) != MEM)
6095 return change_address (temp, mode,
6096 fix_lexical_addr (XEXP (temp, 0), exp));
6098 if (SAVE_EXPR_RTL (exp) == 0)
6100 if (mode == VOIDmode)
6103 temp = assign_temp (type, 3, 0, 0);
6105 SAVE_EXPR_RTL (exp) = temp;
6106 if (!optimize && GET_CODE (temp) == REG)
6107 save_expr_regs = gen_rtx_EXPR_LIST (VOIDmode, temp,
6110 /* If the mode of TEMP does not match that of the expression, it
6111 must be a promoted value. We pass store_expr a SUBREG of the
6112 wanted mode but mark it so that we know that it was already
6113 extended. Note that `unsignedp' was modified above in
6116 if (GET_CODE (temp) == REG && GET_MODE (temp) != mode)
6118 temp = gen_rtx_SUBREG (mode, SAVE_EXPR_RTL (exp), 0);
6119 SUBREG_PROMOTED_VAR_P (temp) = 1;
6120 SUBREG_PROMOTED_UNSIGNED_P (temp) = unsignedp;
6123 if (temp == const0_rtx)
6124 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode,
6125 EXPAND_MEMORY_USE_BAD);
6127 store_expr (TREE_OPERAND (exp, 0), temp, 0);
6129 TREE_USED (exp) = 1;
6132 /* If the mode of SAVE_EXPR_RTL does not match that of the expression, it
6133 must be a promoted value. We return a SUBREG of the wanted mode,
6134 but mark it so that we know that it was already extended. */
6136 if (GET_CODE (SAVE_EXPR_RTL (exp)) == REG
6137 && GET_MODE (SAVE_EXPR_RTL (exp)) != mode)
6139 /* Compute the signedness and make the proper SUBREG. */
6140 promote_mode (type, mode, &unsignedp, 0);
6141 temp = gen_rtx_SUBREG (mode, SAVE_EXPR_RTL (exp), 0);
6142 SUBREG_PROMOTED_VAR_P (temp) = 1;
6143 SUBREG_PROMOTED_UNSIGNED_P (temp) = unsignedp;
6147 return SAVE_EXPR_RTL (exp);
6152 temp = expand_expr (TREE_OPERAND (exp, 0), target, tmode, modifier);
6153 TREE_OPERAND (exp, 0) = unsave_expr_now (TREE_OPERAND (exp, 0));
6157 case PLACEHOLDER_EXPR:
6159 tree placeholder_expr;
6161 /* If there is an object on the head of the placeholder list,
6162 see if some object in it of type TYPE or a pointer to it. For
6163 further information, see tree.def. */
6164 for (placeholder_expr = placeholder_list;
6165 placeholder_expr != 0;
6166 placeholder_expr = TREE_CHAIN (placeholder_expr))
6168 tree need_type = TYPE_MAIN_VARIANT (type);
6170 tree old_list = placeholder_list;
6173 /* Find the outermost reference that is of the type we want.
6174 If none, see if any object has a type that is a pointer to
6175 the type we want. */
6176 for (elt = TREE_PURPOSE (placeholder_expr);
6177 elt != 0 && object == 0;
6179 = ((TREE_CODE (elt) == COMPOUND_EXPR
6180 || TREE_CODE (elt) == COND_EXPR)
6181 ? TREE_OPERAND (elt, 1)
6182 : (TREE_CODE_CLASS (TREE_CODE (elt)) == 'r'
6183 || TREE_CODE_CLASS (TREE_CODE (elt)) == '1'
6184 || TREE_CODE_CLASS (TREE_CODE (elt)) == '2'
6185 || TREE_CODE_CLASS (TREE_CODE (elt)) == 'e')
6186 ? TREE_OPERAND (elt, 0) : 0))
6187 if (TYPE_MAIN_VARIANT (TREE_TYPE (elt)) == need_type)
6190 for (elt = TREE_PURPOSE (placeholder_expr);
6191 elt != 0 && object == 0;
6193 = ((TREE_CODE (elt) == COMPOUND_EXPR
6194 || TREE_CODE (elt) == COND_EXPR)
6195 ? TREE_OPERAND (elt, 1)
6196 : (TREE_CODE_CLASS (TREE_CODE (elt)) == 'r'
6197 || TREE_CODE_CLASS (TREE_CODE (elt)) == '1'
6198 || TREE_CODE_CLASS (TREE_CODE (elt)) == '2'
6199 || TREE_CODE_CLASS (TREE_CODE (elt)) == 'e')
6200 ? TREE_OPERAND (elt, 0) : 0))
6201 if (POINTER_TYPE_P (TREE_TYPE (elt))
6202 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (elt)))
6204 object = build1 (INDIRECT_REF, need_type, elt);
6208 /* Expand this object skipping the list entries before
6209 it was found in case it is also a PLACEHOLDER_EXPR.
6210 In that case, we want to translate it using subsequent
6212 placeholder_list = TREE_CHAIN (placeholder_expr);
6213 temp = expand_expr (object, original_target, tmode,
6215 placeholder_list = old_list;
6221 /* We can't find the object or there was a missing WITH_RECORD_EXPR. */
6224 case WITH_RECORD_EXPR:
6225 /* Put the object on the placeholder list, expand our first operand,
6226 and pop the list. */
6227 placeholder_list = tree_cons (TREE_OPERAND (exp, 1), NULL_TREE,
6229 target = expand_expr (TREE_OPERAND (exp, 0), original_target,
6230 tmode, ro_modifier);
6231 placeholder_list = TREE_CHAIN (placeholder_list);
6235 if (TREE_CODE (TREE_OPERAND (exp, 0)) == LABEL_DECL)
6236 expand_goto (TREE_OPERAND (exp, 0));
6238 expand_computed_goto (TREE_OPERAND (exp, 0));
6242 expand_exit_loop_if_false (NULL_PTR,
6243 invert_truthvalue (TREE_OPERAND (exp, 0)));
6246 case LABELED_BLOCK_EXPR:
6247 if (LABELED_BLOCK_BODY (exp))
6248 expand_expr_stmt (LABELED_BLOCK_BODY (exp));
6249 emit_label (label_rtx (LABELED_BLOCK_LABEL (exp)));
6252 case EXIT_BLOCK_EXPR:
6253 if (EXIT_BLOCK_RETURN (exp))
6254 sorry ("returned value in block_exit_expr");
6255 expand_goto (LABELED_BLOCK_LABEL (EXIT_BLOCK_LABELED_BLOCK (exp)));
6260 expand_start_loop (1);
6261 expand_expr_stmt (TREE_OPERAND (exp, 0));
6269 tree vars = TREE_OPERAND (exp, 0);
6270 int vars_need_expansion = 0;
6272 /* Need to open a binding contour here because
6273 if there are any cleanups they must be contained here. */
6274 expand_start_bindings (2);
6276 /* Mark the corresponding BLOCK for output in its proper place. */
6277 if (TREE_OPERAND (exp, 2) != 0
6278 && ! TREE_USED (TREE_OPERAND (exp, 2)))
6279 insert_block (TREE_OPERAND (exp, 2));
6281 /* If VARS have not yet been expanded, expand them now. */
6284 if (DECL_RTL (vars) == 0)
6286 vars_need_expansion = 1;
6289 expand_decl_init (vars);
6290 vars = TREE_CHAIN (vars);
6293 temp = expand_expr (TREE_OPERAND (exp, 1), target, tmode, ro_modifier);
6295 expand_end_bindings (TREE_OPERAND (exp, 0), 0, 0);
6301 if (RTL_EXPR_SEQUENCE (exp))
6303 if (RTL_EXPR_SEQUENCE (exp) == const0_rtx)
6305 emit_insns (RTL_EXPR_SEQUENCE (exp));
6306 RTL_EXPR_SEQUENCE (exp) = const0_rtx;
6308 preserve_rtl_expr_result (RTL_EXPR_RTL (exp));
6309 free_temps_for_rtl_expr (exp);
6310 return RTL_EXPR_RTL (exp);
6313 /* If we don't need the result, just ensure we evaluate any
6318 for (elt = CONSTRUCTOR_ELTS (exp); elt; elt = TREE_CHAIN (elt))
6319 expand_expr (TREE_VALUE (elt), const0_rtx, VOIDmode,
6320 EXPAND_MEMORY_USE_BAD);
6324 /* All elts simple constants => refer to a constant in memory. But
6325 if this is a non-BLKmode mode, let it store a field at a time
6326 since that should make a CONST_INT or CONST_DOUBLE when we
6327 fold. Likewise, if we have a target we can use, it is best to
6328 store directly into the target unless the type is large enough
6329 that memcpy will be used. If we are making an initializer and
6330 all operands are constant, put it in memory as well. */
6331 else if ((TREE_STATIC (exp)
6332 && ((mode == BLKmode
6333 && ! (target != 0 && safe_from_p (target, exp, 1)))
6334 || TREE_ADDRESSABLE (exp)
6335 || (TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST
6336 && (!MOVE_BY_PIECES_P
6337 (TREE_INT_CST_LOW (TYPE_SIZE (type))/BITS_PER_UNIT,
6338 TYPE_ALIGN (type) / BITS_PER_UNIT))
6339 && ! mostly_zeros_p (exp))))
6340 || (modifier == EXPAND_INITIALIZER && TREE_CONSTANT (exp)))
6342 rtx constructor = output_constant_def (exp);
6343 if (modifier != EXPAND_CONST_ADDRESS
6344 && modifier != EXPAND_INITIALIZER
6345 && modifier != EXPAND_SUM
6346 && (! memory_address_p (GET_MODE (constructor),
6347 XEXP (constructor, 0))
6349 && GET_CODE (XEXP (constructor, 0)) != REG)))
6350 constructor = change_address (constructor, VOIDmode,
6351 XEXP (constructor, 0));
6357 /* Handle calls that pass values in multiple non-contiguous
6358 locations. The Irix 6 ABI has examples of this. */
6359 if (target == 0 || ! safe_from_p (target, exp, 1)
6360 || GET_CODE (target) == PARALLEL)
6362 if (mode != BLKmode && ! TREE_ADDRESSABLE (exp))
6363 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
6365 target = assign_temp (type, 0, 1, 1);
6368 if (TREE_READONLY (exp))
6370 if (GET_CODE (target) == MEM)
6371 target = copy_rtx (target);
6373 RTX_UNCHANGING_P (target) = 1;
6376 store_constructor (exp, target, TYPE_ALIGN (TREE_TYPE (exp)), 0,
6377 int_size_in_bytes (TREE_TYPE (exp)));
6383 tree exp1 = TREE_OPERAND (exp, 0);
6386 tree string = string_constant (exp1, &index);
6389 /* Try to optimize reads from const strings. */
6391 && TREE_CODE (string) == STRING_CST
6392 && TREE_CODE (index) == INTEGER_CST
6393 && !TREE_INT_CST_HIGH (index)
6394 && (i = TREE_INT_CST_LOW (index)) < TREE_STRING_LENGTH (string)
6395 && GET_MODE_CLASS (mode) == MODE_INT
6396 && GET_MODE_SIZE (mode) == 1
6397 && modifier != EXPAND_MEMORY_USE_WO)
6398 return GEN_INT (TREE_STRING_POINTER (string)[i]);
6400 op0 = expand_expr (exp1, NULL_RTX, VOIDmode, EXPAND_SUM);
6401 op0 = memory_address (mode, op0);
6403 if (cfun && current_function_check_memory_usage
6404 && ! AGGREGATE_TYPE_P (TREE_TYPE (exp)))
6406 enum memory_use_mode memory_usage;
6407 memory_usage = get_memory_usage_from_modifier (modifier);
6409 if (memory_usage != MEMORY_USE_DONT)
6411 in_check_memory_usage = 1;
6412 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
6414 GEN_INT (int_size_in_bytes (type)),
6415 TYPE_MODE (sizetype),
6416 GEN_INT (memory_usage),
6417 TYPE_MODE (integer_type_node));
6418 in_check_memory_usage = 0;
6422 temp = gen_rtx_MEM (mode, op0);
6423 /* If address was computed by addition,
6424 mark this as an element of an aggregate. */
6425 if (TREE_CODE (exp1) == PLUS_EXPR
6426 || (TREE_CODE (exp1) == SAVE_EXPR
6427 && TREE_CODE (TREE_OPERAND (exp1, 0)) == PLUS_EXPR)
6428 || AGGREGATE_TYPE_P (TREE_TYPE (exp))
6429 || (TREE_CODE (exp1) == ADDR_EXPR
6430 && (exp2 = TREE_OPERAND (exp1, 0))
6431 && AGGREGATE_TYPE_P (TREE_TYPE (exp2))))
6432 MEM_SET_IN_STRUCT_P (temp, 1);
6434 MEM_VOLATILE_P (temp) = TREE_THIS_VOLATILE (exp) | flag_volatile;
6435 MEM_ALIAS_SET (temp) = get_alias_set (exp);
6437 /* It is incorrect to set RTX_UNCHANGING_P from TREE_READONLY
6438 here, because, in C and C++, the fact that a location is accessed
6439 through a pointer to const does not mean that the value there can
6440 never change. Languages where it can never change should
6441 also set TREE_STATIC. */
6442 RTX_UNCHANGING_P (temp) = TREE_READONLY (exp) & TREE_STATIC (exp);
6444 /* If we are writing to this object and its type is a record with
6445 readonly fields, we must mark it as readonly so it will
6446 conflict with readonly references to those fields. */
6447 if (modifier == EXPAND_MEMORY_USE_WO
6448 && TREE_CODE (type) == RECORD_TYPE && readonly_fields_p (type))
6449 RTX_UNCHANGING_P (temp) = 1;
6455 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) != ARRAY_TYPE)
6459 tree array = TREE_OPERAND (exp, 0);
6460 tree domain = TYPE_DOMAIN (TREE_TYPE (array));
6461 tree low_bound = domain ? TYPE_MIN_VALUE (domain) : integer_zero_node;
6462 tree index = convert (sizetype, TREE_OPERAND (exp, 1));
6465 /* Optimize the special-case of a zero lower bound.
6467 We convert the low_bound to sizetype to avoid some problems
6468 with constant folding. (E.g. suppose the lower bound is 1,
6469 and its mode is QI. Without the conversion, (ARRAY
6470 +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1))
6471 +INDEX), which becomes (ARRAY+255+INDEX). Oops!) */
6473 if (! integer_zerop (low_bound))
6474 index = size_diffop (index, convert (sizetype, low_bound));
6476 /* Fold an expression like: "foo"[2].
6477 This is not done in fold so it won't happen inside &.
6478 Don't fold if this is for wide characters since it's too
6479 difficult to do correctly and this is a very rare case. */
6481 if (TREE_CODE (array) == STRING_CST
6482 && TREE_CODE (index) == INTEGER_CST
6483 && !TREE_INT_CST_HIGH (index)
6484 && (i = TREE_INT_CST_LOW (index)) < TREE_STRING_LENGTH (array)
6485 && GET_MODE_CLASS (mode) == MODE_INT
6486 && GET_MODE_SIZE (mode) == 1)
6487 return GEN_INT (TREE_STRING_POINTER (array)[i]);
6489 /* If this is a constant index into a constant array,
6490 just get the value from the array. Handle both the cases when
6491 we have an explicit constructor and when our operand is a variable
6492 that was declared const. */
6494 if (TREE_CODE (array) == CONSTRUCTOR && ! TREE_SIDE_EFFECTS (array))
6496 if (TREE_CODE (index) == INTEGER_CST
6497 && TREE_INT_CST_HIGH (index) == 0)
6499 tree elem = CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0));
6501 i = TREE_INT_CST_LOW (index);
6503 elem = TREE_CHAIN (elem);
6505 return expand_expr (fold (TREE_VALUE (elem)), target,
6506 tmode, ro_modifier);
6510 else if (optimize >= 1
6511 && TREE_READONLY (array) && ! TREE_SIDE_EFFECTS (array)
6512 && TREE_CODE (array) == VAR_DECL && DECL_INITIAL (array)
6513 && TREE_CODE (DECL_INITIAL (array)) != ERROR_MARK)
6515 if (TREE_CODE (index) == INTEGER_CST)
6517 tree init = DECL_INITIAL (array);
6519 i = TREE_INT_CST_LOW (index);
6520 if (TREE_CODE (init) == CONSTRUCTOR)
6522 tree elem = CONSTRUCTOR_ELTS (init);
6525 && !tree_int_cst_equal (TREE_PURPOSE (elem), index))
6526 elem = TREE_CHAIN (elem);
6528 return expand_expr (fold (TREE_VALUE (elem)), target,
6529 tmode, ro_modifier);
6531 else if (TREE_CODE (init) == STRING_CST
6532 && TREE_INT_CST_HIGH (index) == 0
6533 && (TREE_INT_CST_LOW (index)
6534 < TREE_STRING_LENGTH (init)))
6536 (TREE_STRING_POINTER
6537 (init)[TREE_INT_CST_LOW (index)]));
6542 /* ... fall through ... */
6546 /* If the operand is a CONSTRUCTOR, we can just extract the
6547 appropriate field if it is present. Don't do this if we have
6548 already written the data since we want to refer to that copy
6549 and varasm.c assumes that's what we'll do. */
6550 if (code != ARRAY_REF
6551 && TREE_CODE (TREE_OPERAND (exp, 0)) == CONSTRUCTOR
6552 && TREE_CST_RTL (TREE_OPERAND (exp, 0)) == 0)
6556 for (elt = CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0)); elt;
6557 elt = TREE_CHAIN (elt))
6558 if (TREE_PURPOSE (elt) == TREE_OPERAND (exp, 1)
6559 /* We can normally use the value of the field in the
6560 CONSTRUCTOR. However, if this is a bitfield in
6561 an integral mode that we can fit in a HOST_WIDE_INT,
6562 we must mask only the number of bits in the bitfield,
6563 since this is done implicitly by the constructor. If
6564 the bitfield does not meet either of those conditions,
6565 we can't do this optimization. */
6566 && (! DECL_BIT_FIELD (TREE_PURPOSE (elt))
6567 || ((GET_MODE_CLASS (DECL_MODE (TREE_PURPOSE (elt)))
6569 && (GET_MODE_BITSIZE (DECL_MODE (TREE_PURPOSE (elt)))
6570 <= HOST_BITS_PER_WIDE_INT))))
6572 op0 = expand_expr (TREE_VALUE (elt), target, tmode, modifier);
6573 if (DECL_BIT_FIELD (TREE_PURPOSE (elt)))
6575 int bitsize = DECL_FIELD_SIZE (TREE_PURPOSE (elt));
6577 if (TREE_UNSIGNED (TREE_TYPE (TREE_PURPOSE (elt))))
6579 op1 = GEN_INT (((HOST_WIDE_INT) 1 << bitsize) - 1);
6580 op0 = expand_and (op0, op1, target);
6584 enum machine_mode imode
6585 = TYPE_MODE (TREE_TYPE (TREE_PURPOSE (elt)));
6587 = build_int_2 (GET_MODE_BITSIZE (imode) - bitsize,
6590 op0 = expand_shift (LSHIFT_EXPR, imode, op0, count,
6592 op0 = expand_shift (RSHIFT_EXPR, imode, op0, count,
6602 enum machine_mode mode1;
6607 unsigned int alignment;
6608 tree tem = get_inner_reference (exp, &bitsize, &bitpos, &offset,
6609 &mode1, &unsignedp, &volatilep,
6612 /* If we got back the original object, something is wrong. Perhaps
6613 we are evaluating an expression too early. In any event, don't
6614 infinitely recurse. */
6618 /* If TEM's type is a union of variable size, pass TARGET to the inner
6619 computation, since it will need a temporary and TARGET is known
6620 to have to do. This occurs in unchecked conversion in Ada. */
6622 op0 = expand_expr (tem,
6623 (TREE_CODE (TREE_TYPE (tem)) == UNION_TYPE
6624 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (tem)))
6626 ? target : NULL_RTX),
6628 (modifier == EXPAND_INITIALIZER
6629 || modifier == EXPAND_CONST_ADDRESS)
6630 ? modifier : EXPAND_NORMAL);
6632 /* If this is a constant, put it into a register if it is a
6633 legitimate constant and OFFSET is 0 and memory if it isn't. */
6634 if (CONSTANT_P (op0))
6636 enum machine_mode mode = TYPE_MODE (TREE_TYPE (tem));
6637 if (mode != BLKmode && LEGITIMATE_CONSTANT_P (op0)
6639 op0 = force_reg (mode, op0);
6641 op0 = validize_mem (force_const_mem (mode, op0));
6646 rtx offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, 0);
6648 /* If this object is in memory, put it into a register.
6649 This case can't occur in C, but can in Ada if we have
6650 unchecked conversion of an expression from a scalar type to
6651 an array or record type. */
6652 if (GET_CODE (op0) == REG || GET_CODE (op0) == SUBREG
6653 || GET_CODE (op0) == CONCAT || GET_CODE (op0) == ADDRESSOF)
6655 rtx memloc = assign_temp (TREE_TYPE (tem), 1, 1, 1);
6657 mark_temp_addr_taken (memloc);
6658 emit_move_insn (memloc, op0);
6662 if (GET_CODE (op0) != MEM)
6665 if (GET_MODE (offset_rtx) != ptr_mode)
6667 #ifdef POINTERS_EXTEND_UNSIGNED
6668 offset_rtx = convert_memory_address (ptr_mode, offset_rtx);
6670 offset_rtx = convert_to_mode (ptr_mode, offset_rtx, 0);
6674 /* A constant address in OP0 can have VOIDmode, we must not try
6675 to call force_reg for that case. Avoid that case. */
6676 if (GET_CODE (op0) == MEM
6677 && GET_MODE (op0) == BLKmode
6678 && GET_MODE (XEXP (op0, 0)) != VOIDmode
6680 && (bitpos % bitsize) == 0
6681 && (bitsize % GET_MODE_ALIGNMENT (mode1)) == 0
6682 && (alignment * BITS_PER_UNIT) == GET_MODE_ALIGNMENT (mode1))
6684 rtx temp = change_address (op0, mode1,
6685 plus_constant (XEXP (op0, 0),
6688 if (GET_CODE (XEXP (temp, 0)) == REG)
6691 op0 = change_address (op0, mode1,
6692 force_reg (GET_MODE (XEXP (temp, 0)),
6698 op0 = change_address (op0, VOIDmode,
6699 gen_rtx_PLUS (ptr_mode, XEXP (op0, 0),
6700 force_reg (ptr_mode,
6704 /* Don't forget about volatility even if this is a bitfield. */
6705 if (GET_CODE (op0) == MEM && volatilep && ! MEM_VOLATILE_P (op0))
6707 op0 = copy_rtx (op0);
6708 MEM_VOLATILE_P (op0) = 1;
6711 /* Check the access. */
6712 if (current_function_check_memory_usage && GET_CODE (op0) == MEM)
6714 enum memory_use_mode memory_usage;
6715 memory_usage = get_memory_usage_from_modifier (modifier);
6717 if (memory_usage != MEMORY_USE_DONT)
6722 to = plus_constant (XEXP (op0, 0), (bitpos / BITS_PER_UNIT));
6723 size = (bitpos % BITS_PER_UNIT) + bitsize + BITS_PER_UNIT - 1;
6725 /* Check the access right of the pointer. */
6726 if (size > BITS_PER_UNIT)
6727 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
6729 GEN_INT (size / BITS_PER_UNIT),
6730 TYPE_MODE (sizetype),
6731 GEN_INT (memory_usage),
6732 TYPE_MODE (integer_type_node));
6736 /* In cases where an aligned union has an unaligned object
6737 as a field, we might be extracting a BLKmode value from
6738 an integer-mode (e.g., SImode) object. Handle this case
6739 by doing the extract into an object as wide as the field
6740 (which we know to be the width of a basic mode), then
6741 storing into memory, and changing the mode to BLKmode.
6742 If we ultimately want the address (EXPAND_CONST_ADDRESS or
6743 EXPAND_INITIALIZER), then we must not copy to a temporary. */
6744 if (mode1 == VOIDmode
6745 || GET_CODE (op0) == REG || GET_CODE (op0) == SUBREG
6746 || (modifier != EXPAND_CONST_ADDRESS
6747 && modifier != EXPAND_INITIALIZER
6748 && ((mode1 != BLKmode && ! direct_load[(int) mode1]
6749 && GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
6750 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT)
6751 /* If the field isn't aligned enough to fetch as a memref,
6752 fetch it as a bit field. */
6753 || (mode1 != BLKmode
6754 && SLOW_UNALIGNED_ACCESS (mode1, alignment)
6755 && ((TYPE_ALIGN (TREE_TYPE (tem))
6756 < (unsigned int) GET_MODE_ALIGNMENT (mode))
6757 || (bitpos % GET_MODE_ALIGNMENT (mode) != 0)))))
6758 || (modifier != EXPAND_CONST_ADDRESS
6759 && modifier != EXPAND_INITIALIZER
6761 && SLOW_UNALIGNED_ACCESS (mode, alignment)
6762 && (TYPE_ALIGN (type) > alignment * BITS_PER_UNIT
6763 || bitpos % TYPE_ALIGN (type) != 0)))
6765 enum machine_mode ext_mode = mode;
6767 if (ext_mode == BLKmode
6768 && ! (target != 0 && GET_CODE (op0) == MEM
6769 && GET_CODE (target) == MEM
6770 && bitpos % BITS_PER_UNIT == 0))
6771 ext_mode = mode_for_size (bitsize, MODE_INT, 1);
6773 if (ext_mode == BLKmode)
6775 /* In this case, BITPOS must start at a byte boundary and
6776 TARGET, if specified, must be a MEM. */
6777 if (GET_CODE (op0) != MEM
6778 || (target != 0 && GET_CODE (target) != MEM)
6779 || bitpos % BITS_PER_UNIT != 0)
6782 op0 = change_address (op0, VOIDmode,
6783 plus_constant (XEXP (op0, 0),
6784 bitpos / BITS_PER_UNIT));
6786 target = assign_temp (type, 0, 1, 1);
6788 emit_block_move (target, op0,
6789 GEN_INT ((bitsize + BITS_PER_UNIT - 1)
6796 op0 = validize_mem (op0);
6798 if (GET_CODE (op0) == MEM && GET_CODE (XEXP (op0, 0)) == REG)
6799 mark_reg_pointer (XEXP (op0, 0), alignment);
6801 op0 = extract_bit_field (op0, bitsize, bitpos,
6802 unsignedp, target, ext_mode, ext_mode,
6804 int_size_in_bytes (TREE_TYPE (tem)));
6806 /* If the result is a record type and BITSIZE is narrower than
6807 the mode of OP0, an integral mode, and this is a big endian
6808 machine, we must put the field into the high-order bits. */
6809 if (TREE_CODE (type) == RECORD_TYPE && BYTES_BIG_ENDIAN
6810 && GET_MODE_CLASS (GET_MODE (op0)) == MODE_INT
6811 && bitsize < GET_MODE_BITSIZE (GET_MODE (op0)))
6812 op0 = expand_shift (LSHIFT_EXPR, GET_MODE (op0), op0,
6813 size_int (GET_MODE_BITSIZE (GET_MODE (op0))
6817 if (mode == BLKmode)
6819 rtx new = assign_stack_temp (ext_mode,
6820 bitsize / BITS_PER_UNIT, 0);
6822 emit_move_insn (new, op0);
6823 op0 = copy_rtx (new);
6824 PUT_MODE (op0, BLKmode);
6825 MEM_SET_IN_STRUCT_P (op0, 1);
6831 /* If the result is BLKmode, use that to access the object
6833 if (mode == BLKmode)
6836 /* Get a reference to just this component. */
6837 if (modifier == EXPAND_CONST_ADDRESS
6838 || modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
6839 op0 = gen_rtx_MEM (mode1, plus_constant (XEXP (op0, 0),
6840 (bitpos / BITS_PER_UNIT)));
6842 op0 = change_address (op0, mode1,
6843 plus_constant (XEXP (op0, 0),
6844 (bitpos / BITS_PER_UNIT)));
6846 if (GET_CODE (op0) == MEM)
6847 MEM_ALIAS_SET (op0) = get_alias_set (exp);
6849 if (GET_CODE (XEXP (op0, 0)) == REG)
6850 mark_reg_pointer (XEXP (op0, 0), alignment);
6852 MEM_SET_IN_STRUCT_P (op0, 1);
6853 MEM_VOLATILE_P (op0) |= volatilep;
6854 if (mode == mode1 || mode1 == BLKmode || mode1 == tmode
6855 || modifier == EXPAND_CONST_ADDRESS
6856 || modifier == EXPAND_INITIALIZER)
6858 else if (target == 0)
6859 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
6861 convert_move (target, op0, unsignedp);
6865 /* Intended for a reference to a buffer of a file-object in Pascal.
6866 But it's not certain that a special tree code will really be
6867 necessary for these. INDIRECT_REF might work for them. */
6873 /* Pascal set IN expression.
6876 rlo = set_low - (set_low%bits_per_word);
6877 the_word = set [ (index - rlo)/bits_per_word ];
6878 bit_index = index % bits_per_word;
6879 bitmask = 1 << bit_index;
6880 return !!(the_word & bitmask); */
6882 tree set = TREE_OPERAND (exp, 0);
6883 tree index = TREE_OPERAND (exp, 1);
6884 int iunsignedp = TREE_UNSIGNED (TREE_TYPE (index));
6885 tree set_type = TREE_TYPE (set);
6886 tree set_low_bound = TYPE_MIN_VALUE (TYPE_DOMAIN (set_type));
6887 tree set_high_bound = TYPE_MAX_VALUE (TYPE_DOMAIN (set_type));
6888 rtx index_val = expand_expr (index, 0, VOIDmode, 0);
6889 rtx lo_r = expand_expr (set_low_bound, 0, VOIDmode, 0);
6890 rtx hi_r = expand_expr (set_high_bound, 0, VOIDmode, 0);
6891 rtx setval = expand_expr (set, 0, VOIDmode, 0);
6892 rtx setaddr = XEXP (setval, 0);
6893 enum machine_mode index_mode = TYPE_MODE (TREE_TYPE (index));
6895 rtx diff, quo, rem, addr, bit, result;
6897 preexpand_calls (exp);
6899 /* If domain is empty, answer is no. Likewise if index is constant
6900 and out of bounds. */
6901 if (((TREE_CODE (set_high_bound) == INTEGER_CST
6902 && TREE_CODE (set_low_bound) == INTEGER_CST
6903 && tree_int_cst_lt (set_high_bound, set_low_bound))
6904 || (TREE_CODE (index) == INTEGER_CST
6905 && TREE_CODE (set_low_bound) == INTEGER_CST
6906 && tree_int_cst_lt (index, set_low_bound))
6907 || (TREE_CODE (set_high_bound) == INTEGER_CST
6908 && TREE_CODE (index) == INTEGER_CST
6909 && tree_int_cst_lt (set_high_bound, index))))
6913 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
6915 /* If we get here, we have to generate the code for both cases
6916 (in range and out of range). */
6918 op0 = gen_label_rtx ();
6919 op1 = gen_label_rtx ();
6921 if (! (GET_CODE (index_val) == CONST_INT
6922 && GET_CODE (lo_r) == CONST_INT))
6924 emit_cmp_and_jump_insns (index_val, lo_r, LT, NULL_RTX,
6925 GET_MODE (index_val), iunsignedp, 0, op1);
6928 if (! (GET_CODE (index_val) == CONST_INT
6929 && GET_CODE (hi_r) == CONST_INT))
6931 emit_cmp_and_jump_insns (index_val, hi_r, GT, NULL_RTX,
6932 GET_MODE (index_val), iunsignedp, 0, op1);
6935 /* Calculate the element number of bit zero in the first word
6937 if (GET_CODE (lo_r) == CONST_INT)
6938 rlow = GEN_INT (INTVAL (lo_r)
6939 & ~ ((HOST_WIDE_INT) 1 << BITS_PER_UNIT));
6941 rlow = expand_binop (index_mode, and_optab, lo_r,
6942 GEN_INT (~((HOST_WIDE_INT) 1 << BITS_PER_UNIT)),
6943 NULL_RTX, iunsignedp, OPTAB_LIB_WIDEN);
6945 diff = expand_binop (index_mode, sub_optab, index_val, rlow,
6946 NULL_RTX, iunsignedp, OPTAB_LIB_WIDEN);
6948 quo = expand_divmod (0, TRUNC_DIV_EXPR, index_mode, diff,
6949 GEN_INT (BITS_PER_UNIT), NULL_RTX, iunsignedp);
6950 rem = expand_divmod (1, TRUNC_MOD_EXPR, index_mode, index_val,
6951 GEN_INT (BITS_PER_UNIT), NULL_RTX, iunsignedp);
6953 addr = memory_address (byte_mode,
6954 expand_binop (index_mode, add_optab, diff,
6955 setaddr, NULL_RTX, iunsignedp,
6958 /* Extract the bit we want to examine */
6959 bit = expand_shift (RSHIFT_EXPR, byte_mode,
6960 gen_rtx_MEM (byte_mode, addr),
6961 make_tree (TREE_TYPE (index), rem),
6963 result = expand_binop (byte_mode, and_optab, bit, const1_rtx,
6964 GET_MODE (target) == byte_mode ? target : 0,
6965 1, OPTAB_LIB_WIDEN);
6967 if (result != target)
6968 convert_move (target, result, 1);
6970 /* Output the code to handle the out-of-range case. */
6973 emit_move_insn (target, const0_rtx);
6978 case WITH_CLEANUP_EXPR:
6979 if (RTL_EXPR_RTL (exp) == 0)
6982 = expand_expr (TREE_OPERAND (exp, 0), target, tmode, ro_modifier);
6983 expand_decl_cleanup (NULL_TREE, TREE_OPERAND (exp, 2));
6985 /* That's it for this cleanup. */
6986 TREE_OPERAND (exp, 2) = 0;
6988 return RTL_EXPR_RTL (exp);
6990 case CLEANUP_POINT_EXPR:
6992 /* Start a new binding layer that will keep track of all cleanup
6993 actions to be performed. */
6994 expand_start_bindings (2);
6996 target_temp_slot_level = temp_slot_level;
6998 op0 = expand_expr (TREE_OPERAND (exp, 0), target, tmode, ro_modifier);
6999 /* If we're going to use this value, load it up now. */
7001 op0 = force_not_mem (op0);
7002 preserve_temp_slots (op0);
7003 expand_end_bindings (NULL_TREE, 0, 0);
7008 /* Check for a built-in function. */
7009 if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
7010 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
7012 && DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
7013 return expand_builtin (exp, target, subtarget, tmode, ignore);
7015 /* If this call was expanded already by preexpand_calls,
7016 just return the result we got. */
7017 if (CALL_EXPR_RTL (exp) != 0)
7018 return CALL_EXPR_RTL (exp);
7020 return expand_call (exp, target, ignore);
7022 case NON_LVALUE_EXPR:
7025 case REFERENCE_EXPR:
7026 if (TREE_CODE (type) == UNION_TYPE)
7028 tree valtype = TREE_TYPE (TREE_OPERAND (exp, 0));
7030 /* If both input and output are BLKmode, this conversion
7031 isn't actually doing anything unless we need to make the
7032 alignment stricter. */
7033 if (mode == BLKmode && TYPE_MODE (valtype) == BLKmode
7034 && (TYPE_ALIGN (type) <= TYPE_ALIGN (valtype)
7035 || TYPE_ALIGN (type) >= BIGGEST_ALIGNMENT))
7036 return expand_expr (TREE_OPERAND (exp, 0), target, tmode,
7041 if (mode != BLKmode)
7042 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
7044 target = assign_temp (type, 0, 1, 1);
7047 if (GET_CODE (target) == MEM)
7048 /* Store data into beginning of memory target. */
7049 store_expr (TREE_OPERAND (exp, 0),
7050 change_address (target, TYPE_MODE (valtype), 0), 0);
7052 else if (GET_CODE (target) == REG)
7053 /* Store this field into a union of the proper type. */
7054 store_field (target,
7055 MIN ((int_size_in_bytes (TREE_TYPE
7056 (TREE_OPERAND (exp, 0)))
7058 GET_MODE_BITSIZE (mode)),
7059 0, TYPE_MODE (valtype), TREE_OPERAND (exp, 0),
7060 VOIDmode, 0, 1, int_size_in_bytes (type), 0);
7064 /* Return the entire union. */
7068 if (mode == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))
7070 op0 = expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode,
7073 /* If the signedness of the conversion differs and OP0 is
7074 a promoted SUBREG, clear that indication since we now
7075 have to do the proper extension. */
7076 if (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))) != unsignedp
7077 && GET_CODE (op0) == SUBREG)
7078 SUBREG_PROMOTED_VAR_P (op0) = 0;
7083 op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, mode, 0);
7084 if (GET_MODE (op0) == mode)
7087 /* If OP0 is a constant, just convert it into the proper mode. */
7088 if (CONSTANT_P (op0))
7090 convert_modes (mode, TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))),
7091 op0, TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
7093 if (modifier == EXPAND_INITIALIZER)
7094 return gen_rtx_fmt_e (unsignedp ? ZERO_EXTEND : SIGN_EXTEND, mode, op0);
7098 convert_to_mode (mode, op0,
7099 TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
7101 convert_move (target, op0,
7102 TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
7106 /* We come here from MINUS_EXPR when the second operand is a
7109 this_optab = add_optab;
7111 /* If we are adding a constant, an RTL_EXPR that is sp, fp, or ap, and
7112 something else, make sure we add the register to the constant and
7113 then to the other thing. This case can occur during strength
7114 reduction and doing it this way will produce better code if the
7115 frame pointer or argument pointer is eliminated.
7117 fold-const.c will ensure that the constant is always in the inner
7118 PLUS_EXPR, so the only case we need to do anything about is if
7119 sp, ap, or fp is our second argument, in which case we must swap
7120 the innermost first argument and our second argument. */
7122 if (TREE_CODE (TREE_OPERAND (exp, 0)) == PLUS_EXPR
7123 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 1)) == INTEGER_CST
7124 && TREE_CODE (TREE_OPERAND (exp, 1)) == RTL_EXPR
7125 && (RTL_EXPR_RTL (TREE_OPERAND (exp, 1)) == frame_pointer_rtx
7126 || RTL_EXPR_RTL (TREE_OPERAND (exp, 1)) == stack_pointer_rtx
7127 || RTL_EXPR_RTL (TREE_OPERAND (exp, 1)) == arg_pointer_rtx))
7129 tree t = TREE_OPERAND (exp, 1);
7131 TREE_OPERAND (exp, 1) = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
7132 TREE_OPERAND (TREE_OPERAND (exp, 0), 0) = t;
7135 /* If the result is to be ptr_mode and we are adding an integer to
7136 something, we might be forming a constant. So try to use
7137 plus_constant. If it produces a sum and we can't accept it,
7138 use force_operand. This allows P = &ARR[const] to generate
7139 efficient code on machines where a SYMBOL_REF is not a valid
7142 If this is an EXPAND_SUM call, always return the sum. */
7143 if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER
7144 || mode == ptr_mode)
7146 if (TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST
7147 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
7148 && TREE_CONSTANT (TREE_OPERAND (exp, 1)))
7152 op1 = expand_expr (TREE_OPERAND (exp, 1), subtarget, VOIDmode,
7154 /* Use immed_double_const to ensure that the constant is
7155 truncated according to the mode of OP1, then sign extended
7156 to a HOST_WIDE_INT. Using the constant directly can result
7157 in non-canonical RTL in a 64x32 cross compile. */
7159 = immed_double_const (TREE_INT_CST_LOW (TREE_OPERAND (exp, 0)),
7161 TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 1))));
7162 op1 = plus_constant (op1, INTVAL (constant_part));
7163 if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7164 op1 = force_operand (op1, target);
7168 else if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
7169 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_INT
7170 && TREE_CONSTANT (TREE_OPERAND (exp, 0)))
7174 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode,
7176 if (! CONSTANT_P (op0))
7178 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX,
7179 VOIDmode, modifier);
7180 /* Don't go to both_summands if modifier
7181 says it's not right to return a PLUS. */
7182 if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7186 /* Use immed_double_const to ensure that the constant is
7187 truncated according to the mode of OP1, then sign extended
7188 to a HOST_WIDE_INT. Using the constant directly can result
7189 in non-canonical RTL in a 64x32 cross compile. */
7191 = immed_double_const (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)),
7193 TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))));
7194 op0 = plus_constant (op0, INTVAL (constant_part));
7195 if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7196 op0 = force_operand (op0, target);
7201 /* No sense saving up arithmetic to be done
7202 if it's all in the wrong mode to form part of an address.
7203 And force_operand won't know whether to sign-extend or
7205 if ((modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7206 || mode != ptr_mode)
7209 preexpand_calls (exp);
7210 if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
7213 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, ro_modifier);
7214 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, ro_modifier);
7217 /* Make sure any term that's a sum with a constant comes last. */
7218 if (GET_CODE (op0) == PLUS
7219 && CONSTANT_P (XEXP (op0, 1)))
7225 /* If adding to a sum including a constant,
7226 associate it to put the constant outside. */
7227 if (GET_CODE (op1) == PLUS
7228 && CONSTANT_P (XEXP (op1, 1)))
7230 rtx constant_term = const0_rtx;
7232 temp = simplify_binary_operation (PLUS, mode, XEXP (op1, 0), op0);
7235 /* Ensure that MULT comes first if there is one. */
7236 else if (GET_CODE (op0) == MULT)
7237 op0 = gen_rtx_PLUS (mode, op0, XEXP (op1, 0));
7239 op0 = gen_rtx_PLUS (mode, XEXP (op1, 0), op0);
7241 /* Let's also eliminate constants from op0 if possible. */
7242 op0 = eliminate_constant_term (op0, &constant_term);
7244 /* CONSTANT_TERM and XEXP (op1, 1) are known to be constant, so
7245 their sum should be a constant. Form it into OP1, since the
7246 result we want will then be OP0 + OP1. */
7248 temp = simplify_binary_operation (PLUS, mode, constant_term,
7253 op1 = gen_rtx_PLUS (mode, constant_term, XEXP (op1, 1));
7256 /* Put a constant term last and put a multiplication first. */
7257 if (CONSTANT_P (op0) || GET_CODE (op1) == MULT)
7258 temp = op1, op1 = op0, op0 = temp;
7260 temp = simplify_binary_operation (PLUS, mode, op0, op1);
7261 return temp ? temp : gen_rtx_PLUS (mode, op0, op1);
7264 /* For initializers, we are allowed to return a MINUS of two
7265 symbolic constants. Here we handle all cases when both operands
7267 /* Handle difference of two symbolic constants,
7268 for the sake of an initializer. */
7269 if ((modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
7270 && really_constant_p (TREE_OPERAND (exp, 0))
7271 && really_constant_p (TREE_OPERAND (exp, 1)))
7273 rtx op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX,
7274 VOIDmode, ro_modifier);
7275 rtx op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX,
7276 VOIDmode, ro_modifier);
7278 /* If the last operand is a CONST_INT, use plus_constant of
7279 the negated constant. Else make the MINUS. */
7280 if (GET_CODE (op1) == CONST_INT)
7281 return plus_constant (op0, - INTVAL (op1));
7283 return gen_rtx_MINUS (mode, op0, op1);
7285 /* Convert A - const to A + (-const). */
7286 if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST)
7288 tree negated = fold (build1 (NEGATE_EXPR, type,
7289 TREE_OPERAND (exp, 1)));
7291 if (TREE_UNSIGNED (type) || TREE_OVERFLOW (negated))
7292 /* If we can't negate the constant in TYPE, leave it alone and
7293 expand_binop will negate it for us. We used to try to do it
7294 here in the signed version of TYPE, but that doesn't work
7295 on POINTER_TYPEs. */;
7298 exp = build (PLUS_EXPR, type, TREE_OPERAND (exp, 0), negated);
7302 this_optab = sub_optab;
7306 preexpand_calls (exp);
7307 /* If first operand is constant, swap them.
7308 Thus the following special case checks need only
7309 check the second operand. */
7310 if (TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST)
7312 register tree t1 = TREE_OPERAND (exp, 0);
7313 TREE_OPERAND (exp, 0) = TREE_OPERAND (exp, 1);
7314 TREE_OPERAND (exp, 1) = t1;
7317 /* Attempt to return something suitable for generating an
7318 indexed address, for machines that support that. */
7320 if (modifier == EXPAND_SUM && mode == ptr_mode
7321 && TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
7322 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
7324 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode,
7327 /* Apply distributive law if OP0 is x+c. */
7328 if (GET_CODE (op0) == PLUS
7329 && GET_CODE (XEXP (op0, 1)) == CONST_INT)
7334 (mode, XEXP (op0, 0),
7335 GEN_INT (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)))),
7336 GEN_INT (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1))
7337 * INTVAL (XEXP (op0, 1))));
7339 if (GET_CODE (op0) != REG)
7340 op0 = force_operand (op0, NULL_RTX);
7341 if (GET_CODE (op0) != REG)
7342 op0 = copy_to_mode_reg (mode, op0);
7345 gen_rtx_MULT (mode, op0,
7346 GEN_INT (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1))));
7349 if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
7352 /* Check for multiplying things that have been extended
7353 from a narrower type. If this machine supports multiplying
7354 in that narrower type with a result in the desired type,
7355 do it that way, and avoid the explicit type-conversion. */
7356 if (TREE_CODE (TREE_OPERAND (exp, 0)) == NOP_EXPR
7357 && TREE_CODE (type) == INTEGER_TYPE
7358 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
7359 < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp, 0))))
7360 && ((TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
7361 && int_fits_type_p (TREE_OPERAND (exp, 1),
7362 TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
7363 /* Don't use a widening multiply if a shift will do. */
7364 && ((GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 1))))
7365 > HOST_BITS_PER_WIDE_INT)
7366 || exact_log2 (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1))) < 0))
7368 (TREE_CODE (TREE_OPERAND (exp, 1)) == NOP_EXPR
7369 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 1), 0)))
7371 TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))))
7372 /* If both operands are extended, they must either both
7373 be zero-extended or both be sign-extended. */
7374 && (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 1), 0)))
7376 TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))))))
7378 enum machine_mode innermode
7379 = TYPE_MODE (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)));
7380 optab other_optab = (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
7381 ? smul_widen_optab : umul_widen_optab);
7382 this_optab = (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
7383 ? umul_widen_optab : smul_widen_optab);
7384 if (mode == GET_MODE_WIDER_MODE (innermode))
7386 if (this_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing)
7388 op0 = expand_expr (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
7389 NULL_RTX, VOIDmode, 0);
7390 if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST)
7391 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX,
7394 op1 = expand_expr (TREE_OPERAND (TREE_OPERAND (exp, 1), 0),
7395 NULL_RTX, VOIDmode, 0);
7398 else if (other_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing
7399 && innermode == word_mode)
7402 op0 = expand_expr (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
7403 NULL_RTX, VOIDmode, 0);
7404 if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST)
7405 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX,
7408 op1 = expand_expr (TREE_OPERAND (TREE_OPERAND (exp, 1), 0),
7409 NULL_RTX, VOIDmode, 0);
7410 temp = expand_binop (mode, other_optab, op0, op1, target,
7411 unsignedp, OPTAB_LIB_WIDEN);
7412 htem = expand_mult_highpart_adjust (innermode,
7413 gen_highpart (innermode, temp),
7415 gen_highpart (innermode, temp),
7417 emit_move_insn (gen_highpart (innermode, temp), htem);
7422 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7423 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
7424 return expand_mult (mode, op0, op1, target, unsignedp);
7426 case TRUNC_DIV_EXPR:
7427 case FLOOR_DIV_EXPR:
7429 case ROUND_DIV_EXPR:
7430 case EXACT_DIV_EXPR:
7431 preexpand_calls (exp);
7432 if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
7434 /* Possible optimization: compute the dividend with EXPAND_SUM
7435 then if the divisor is constant can optimize the case
7436 where some terms of the dividend have coeffs divisible by it. */
7437 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7438 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
7439 return expand_divmod (0, code, mode, op0, op1, target, unsignedp);
7442 this_optab = flodiv_optab;
7445 case TRUNC_MOD_EXPR:
7446 case FLOOR_MOD_EXPR:
7448 case ROUND_MOD_EXPR:
7449 preexpand_calls (exp);
7450 if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
7452 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7453 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
7454 return expand_divmod (1, code, mode, op0, op1, target, unsignedp);
7456 case FIX_ROUND_EXPR:
7457 case FIX_FLOOR_EXPR:
7459 abort (); /* Not used for C. */
7461 case FIX_TRUNC_EXPR:
7462 op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
7464 target = gen_reg_rtx (mode);
7465 expand_fix (target, op0, unsignedp);
7469 op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
7471 target = gen_reg_rtx (mode);
7472 /* expand_float can't figure out what to do if FROM has VOIDmode.
7473 So give it the correct mode. With -O, cse will optimize this. */
7474 if (GET_MODE (op0) == VOIDmode)
7475 op0 = copy_to_mode_reg (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))),
7477 expand_float (target, op0,
7478 TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
7482 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7483 temp = expand_unop (mode, neg_optab, op0, target, 0);
7489 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7491 /* Handle complex values specially. */
7492 if (GET_MODE_CLASS (mode) == MODE_COMPLEX_INT
7493 || GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT)
7494 return expand_complex_abs (mode, op0, target, unsignedp);
7496 /* Unsigned abs is simply the operand. Testing here means we don't
7497 risk generating incorrect code below. */
7498 if (TREE_UNSIGNED (type))
7501 return expand_abs (mode, op0, target,
7502 safe_from_p (target, TREE_OPERAND (exp, 0), 1));
7506 target = original_target;
7507 if (target == 0 || ! safe_from_p (target, TREE_OPERAND (exp, 1), 1)
7508 || (GET_CODE (target) == MEM && MEM_VOLATILE_P (target))
7509 || GET_MODE (target) != mode
7510 || (GET_CODE (target) == REG
7511 && REGNO (target) < FIRST_PSEUDO_REGISTER))
7512 target = gen_reg_rtx (mode);
7513 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
7514 op0 = expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode, 0);
7516 /* First try to do it with a special MIN or MAX instruction.
7517 If that does not win, use a conditional jump to select the proper
7519 this_optab = (TREE_UNSIGNED (type)
7520 ? (code == MIN_EXPR ? umin_optab : umax_optab)
7521 : (code == MIN_EXPR ? smin_optab : smax_optab));
7523 temp = expand_binop (mode, this_optab, op0, op1, target, unsignedp,
7528 /* At this point, a MEM target is no longer useful; we will get better
7531 if (GET_CODE (target) == MEM)
7532 target = gen_reg_rtx (mode);
7535 emit_move_insn (target, op0);
7537 op0 = gen_label_rtx ();
7539 /* If this mode is an integer too wide to compare properly,
7540 compare word by word. Rely on cse to optimize constant cases. */
7541 if (GET_MODE_CLASS (mode) == MODE_INT
7542 && ! can_compare_p (GE, mode, ccp_jump))
7544 if (code == MAX_EXPR)
7545 do_jump_by_parts_greater_rtx (mode, TREE_UNSIGNED (type),
7546 target, op1, NULL_RTX, op0);
7548 do_jump_by_parts_greater_rtx (mode, TREE_UNSIGNED (type),
7549 op1, target, NULL_RTX, op0);
7553 int unsignedp = TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 1)));
7554 do_compare_rtx_and_jump (target, op1, code == MAX_EXPR ? GE : LE,
7555 unsignedp, mode, NULL_RTX, 0, NULL_RTX,
7558 emit_move_insn (target, op1);
7563 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7564 temp = expand_unop (mode, one_cmpl_optab, op0, target, 1);
7570 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7571 temp = expand_unop (mode, ffs_optab, op0, target, 1);
7576 /* ??? Can optimize bitwise operations with one arg constant.
7577 Can optimize (a bitwise1 n) bitwise2 (a bitwise3 b)
7578 and (a bitwise1 b) bitwise2 b (etc)
7579 but that is probably not worth while. */
7581 /* BIT_AND_EXPR is for bitwise anding. TRUTH_AND_EXPR is for anding two
7582 boolean values when we want in all cases to compute both of them. In
7583 general it is fastest to do TRUTH_AND_EXPR by computing both operands
7584 as actual zero-or-1 values and then bitwise anding. In cases where
7585 there cannot be any side effects, better code would be made by
7586 treating TRUTH_AND_EXPR like TRUTH_ANDIF_EXPR; but the question is
7587 how to recognize those cases. */
7589 case TRUTH_AND_EXPR:
7591 this_optab = and_optab;
7596 this_optab = ior_optab;
7599 case TRUTH_XOR_EXPR:
7601 this_optab = xor_optab;
7608 preexpand_calls (exp);
7609 if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
7611 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7612 return expand_shift (code, mode, op0, TREE_OPERAND (exp, 1), target,
7615 /* Could determine the answer when only additive constants differ. Also,
7616 the addition of one can be handled by changing the condition. */
7623 case UNORDERED_EXPR:
7630 preexpand_calls (exp);
7631 temp = do_store_flag (exp, target, tmode != VOIDmode ? tmode : mode, 0);
7635 /* For foo != 0, load foo, and if it is nonzero load 1 instead. */
7636 if (code == NE_EXPR && integer_zerop (TREE_OPERAND (exp, 1))
7638 && GET_CODE (original_target) == REG
7639 && (GET_MODE (original_target)
7640 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))))
7642 temp = expand_expr (TREE_OPERAND (exp, 0), original_target,
7645 if (temp != original_target)
7646 temp = copy_to_reg (temp);
7648 op1 = gen_label_rtx ();
7649 emit_cmp_and_jump_insns (temp, const0_rtx, EQ, NULL_RTX,
7650 GET_MODE (temp), unsignedp, 0, op1);
7651 emit_move_insn (temp, const1_rtx);
7656 /* If no set-flag instruction, must generate a conditional
7657 store into a temporary variable. Drop through
7658 and handle this like && and ||. */
7660 case TRUTH_ANDIF_EXPR:
7661 case TRUTH_ORIF_EXPR:
7663 && (target == 0 || ! safe_from_p (target, exp, 1)
7664 /* Make sure we don't have a hard reg (such as function's return
7665 value) live across basic blocks, if not optimizing. */
7666 || (!optimize && GET_CODE (target) == REG
7667 && REGNO (target) < FIRST_PSEUDO_REGISTER)))
7668 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
7671 emit_clr_insn (target);
7673 op1 = gen_label_rtx ();
7674 jumpifnot (exp, op1);
7677 emit_0_to_1_insn (target);
7680 return ignore ? const0_rtx : target;
7682 case TRUTH_NOT_EXPR:
7683 op0 = expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode, 0);
7684 /* The parser is careful to generate TRUTH_NOT_EXPR
7685 only with operands that are always zero or one. */
7686 temp = expand_binop (mode, xor_optab, op0, const1_rtx,
7687 target, 1, OPTAB_LIB_WIDEN);
7693 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0);
7695 return expand_expr (TREE_OPERAND (exp, 1),
7696 (ignore ? const0_rtx : target),
7700 /* If we would have a "singleton" (see below) were it not for a
7701 conversion in each arm, bring that conversion back out. */
7702 if (TREE_CODE (TREE_OPERAND (exp, 1)) == NOP_EXPR
7703 && TREE_CODE (TREE_OPERAND (exp, 2)) == NOP_EXPR
7704 && (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 1), 0))
7705 == TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 2), 0))))
7707 tree true = TREE_OPERAND (TREE_OPERAND (exp, 1), 0);
7708 tree false = TREE_OPERAND (TREE_OPERAND (exp, 2), 0);
7710 if ((TREE_CODE_CLASS (TREE_CODE (true)) == '2'
7711 && operand_equal_p (false, TREE_OPERAND (true, 0), 0))
7712 || (TREE_CODE_CLASS (TREE_CODE (false)) == '2'
7713 && operand_equal_p (true, TREE_OPERAND (false, 0), 0))
7714 || (TREE_CODE_CLASS (TREE_CODE (true)) == '1'
7715 && operand_equal_p (false, TREE_OPERAND (true, 0), 0))
7716 || (TREE_CODE_CLASS (TREE_CODE (false)) == '1'
7717 && operand_equal_p (true, TREE_OPERAND (false, 0), 0)))
7718 return expand_expr (build1 (NOP_EXPR, type,
7719 build (COND_EXPR, TREE_TYPE (true),
7720 TREE_OPERAND (exp, 0),
7722 target, tmode, modifier);
7726 /* Note that COND_EXPRs whose type is a structure or union
7727 are required to be constructed to contain assignments of
7728 a temporary variable, so that we can evaluate them here
7729 for side effect only. If type is void, we must do likewise. */
7731 /* If an arm of the branch requires a cleanup,
7732 only that cleanup is performed. */
7735 tree binary_op = 0, unary_op = 0;
7737 /* If this is (A ? 1 : 0) and A is a condition, just evaluate it and
7738 convert it to our mode, if necessary. */
7739 if (integer_onep (TREE_OPERAND (exp, 1))
7740 && integer_zerop (TREE_OPERAND (exp, 2))
7741 && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<')
7745 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode,
7750 op0 = expand_expr (TREE_OPERAND (exp, 0), target, mode, ro_modifier);
7751 if (GET_MODE (op0) == mode)
7755 target = gen_reg_rtx (mode);
7756 convert_move (target, op0, unsignedp);
7760 /* Check for X ? A + B : A. If we have this, we can copy A to the
7761 output and conditionally add B. Similarly for unary operations.
7762 Don't do this if X has side-effects because those side effects
7763 might affect A or B and the "?" operation is a sequence point in
7764 ANSI. (operand_equal_p tests for side effects.) */
7766 if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 1))) == '2'
7767 && operand_equal_p (TREE_OPERAND (exp, 2),
7768 TREE_OPERAND (TREE_OPERAND (exp, 1), 0), 0))
7769 singleton = TREE_OPERAND (exp, 2), binary_op = TREE_OPERAND (exp, 1);
7770 else if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 2))) == '2'
7771 && operand_equal_p (TREE_OPERAND (exp, 1),
7772 TREE_OPERAND (TREE_OPERAND (exp, 2), 0), 0))
7773 singleton = TREE_OPERAND (exp, 1), binary_op = TREE_OPERAND (exp, 2);
7774 else if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 1))) == '1'
7775 && operand_equal_p (TREE_OPERAND (exp, 2),
7776 TREE_OPERAND (TREE_OPERAND (exp, 1), 0), 0))
7777 singleton = TREE_OPERAND (exp, 2), unary_op = TREE_OPERAND (exp, 1);
7778 else if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 2))) == '1'
7779 && operand_equal_p (TREE_OPERAND (exp, 1),
7780 TREE_OPERAND (TREE_OPERAND (exp, 2), 0), 0))
7781 singleton = TREE_OPERAND (exp, 1), unary_op = TREE_OPERAND (exp, 2);
7783 /* If we are not to produce a result, we have no target. Otherwise,
7784 if a target was specified use it; it will not be used as an
7785 intermediate target unless it is safe. If no target, use a
7790 else if (original_target
7791 && (safe_from_p (original_target, TREE_OPERAND (exp, 0), 1)
7792 || (singleton && GET_CODE (original_target) == REG
7793 && REGNO (original_target) >= FIRST_PSEUDO_REGISTER
7794 && original_target == var_rtx (singleton)))
7795 && GET_MODE (original_target) == mode
7796 #ifdef HAVE_conditional_move
7797 && (! can_conditionally_move_p (mode)
7798 || GET_CODE (original_target) == REG
7799 || TREE_ADDRESSABLE (type))
7801 && ! (GET_CODE (original_target) == MEM
7802 && MEM_VOLATILE_P (original_target)))
7803 temp = original_target;
7804 else if (TREE_ADDRESSABLE (type))
7807 temp = assign_temp (type, 0, 0, 1);
7809 /* If we had X ? A + C : A, with C a constant power of 2, and we can
7810 do the test of X as a store-flag operation, do this as
7811 A + ((X != 0) << log C). Similarly for other simple binary
7812 operators. Only do for C == 1 if BRANCH_COST is low. */
7813 if (temp && singleton && binary_op
7814 && (TREE_CODE (binary_op) == PLUS_EXPR
7815 || TREE_CODE (binary_op) == MINUS_EXPR
7816 || TREE_CODE (binary_op) == BIT_IOR_EXPR
7817 || TREE_CODE (binary_op) == BIT_XOR_EXPR)
7818 && (BRANCH_COST >= 3 ? integer_pow2p (TREE_OPERAND (binary_op, 1))
7819 : integer_onep (TREE_OPERAND (binary_op, 1)))
7820 && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<')
7823 optab boptab = (TREE_CODE (binary_op) == PLUS_EXPR ? add_optab
7824 : TREE_CODE (binary_op) == MINUS_EXPR ? sub_optab
7825 : TREE_CODE (binary_op) == BIT_IOR_EXPR ? ior_optab
7828 /* If we had X ? A : A + 1, do this as A + (X == 0).
7830 We have to invert the truth value here and then put it
7831 back later if do_store_flag fails. We cannot simply copy
7832 TREE_OPERAND (exp, 0) to another variable and modify that
7833 because invert_truthvalue can modify the tree pointed to
7835 if (singleton == TREE_OPERAND (exp, 1))
7836 TREE_OPERAND (exp, 0)
7837 = invert_truthvalue (TREE_OPERAND (exp, 0));
7839 result = do_store_flag (TREE_OPERAND (exp, 0),
7840 (safe_from_p (temp, singleton, 1)
7842 mode, BRANCH_COST <= 1);
7844 if (result != 0 && ! integer_onep (TREE_OPERAND (binary_op, 1)))
7845 result = expand_shift (LSHIFT_EXPR, mode, result,
7846 build_int_2 (tree_log2
7850 (safe_from_p (temp, singleton, 1)
7851 ? temp : NULL_RTX), 0);
7855 op1 = expand_expr (singleton, NULL_RTX, VOIDmode, 0);
7856 return expand_binop (mode, boptab, op1, result, temp,
7857 unsignedp, OPTAB_LIB_WIDEN);
7859 else if (singleton == TREE_OPERAND (exp, 1))
7860 TREE_OPERAND (exp, 0)
7861 = invert_truthvalue (TREE_OPERAND (exp, 0));
7864 do_pending_stack_adjust ();
7866 op0 = gen_label_rtx ();
7868 if (singleton && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0)))
7872 /* If the target conflicts with the other operand of the
7873 binary op, we can't use it. Also, we can't use the target
7874 if it is a hard register, because evaluating the condition
7875 might clobber it. */
7877 && ! safe_from_p (temp, TREE_OPERAND (binary_op, 1), 1))
7878 || (GET_CODE (temp) == REG
7879 && REGNO (temp) < FIRST_PSEUDO_REGISTER))
7880 temp = gen_reg_rtx (mode);
7881 store_expr (singleton, temp, 0);
7884 expand_expr (singleton,
7885 ignore ? const0_rtx : NULL_RTX, VOIDmode, 0);
7886 if (singleton == TREE_OPERAND (exp, 1))
7887 jumpif (TREE_OPERAND (exp, 0), op0);
7889 jumpifnot (TREE_OPERAND (exp, 0), op0);
7891 start_cleanup_deferral ();
7892 if (binary_op && temp == 0)
7893 /* Just touch the other operand. */
7894 expand_expr (TREE_OPERAND (binary_op, 1),
7895 ignore ? const0_rtx : NULL_RTX, VOIDmode, 0);
7897 store_expr (build (TREE_CODE (binary_op), type,
7898 make_tree (type, temp),
7899 TREE_OPERAND (binary_op, 1)),
7902 store_expr (build1 (TREE_CODE (unary_op), type,
7903 make_tree (type, temp)),
7907 /* Check for A op 0 ? A : FOO and A op 0 ? FOO : A where OP is any
7908 comparison operator. If we have one of these cases, set the
7909 output to A, branch on A (cse will merge these two references),
7910 then set the output to FOO. */
7912 && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<'
7913 && integer_zerop (TREE_OPERAND (TREE_OPERAND (exp, 0), 1))
7914 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
7915 TREE_OPERAND (exp, 1), 0)
7916 && (! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0))
7917 || TREE_CODE (TREE_OPERAND (exp, 1)) == SAVE_EXPR)
7918 && safe_from_p (temp, TREE_OPERAND (exp, 2), 1))
7920 if (GET_CODE (temp) == REG && REGNO (temp) < FIRST_PSEUDO_REGISTER)
7921 temp = gen_reg_rtx (mode);
7922 store_expr (TREE_OPERAND (exp, 1), temp, 0);
7923 jumpif (TREE_OPERAND (exp, 0), op0);
7925 start_cleanup_deferral ();
7926 store_expr (TREE_OPERAND (exp, 2), temp, 0);
7930 && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<'
7931 && integer_zerop (TREE_OPERAND (TREE_OPERAND (exp, 0), 1))
7932 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
7933 TREE_OPERAND (exp, 2), 0)
7934 && (! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0))
7935 || TREE_CODE (TREE_OPERAND (exp, 2)) == SAVE_EXPR)
7936 && safe_from_p (temp, TREE_OPERAND (exp, 1), 1))
7938 if (GET_CODE (temp) == REG && REGNO (temp) < FIRST_PSEUDO_REGISTER)
7939 temp = gen_reg_rtx (mode);
7940 store_expr (TREE_OPERAND (exp, 2), temp, 0);
7941 jumpifnot (TREE_OPERAND (exp, 0), op0);
7943 start_cleanup_deferral ();
7944 store_expr (TREE_OPERAND (exp, 1), temp, 0);
7949 op1 = gen_label_rtx ();
7950 jumpifnot (TREE_OPERAND (exp, 0), op0);
7952 start_cleanup_deferral ();
7954 /* One branch of the cond can be void, if it never returns. For
7955 example A ? throw : E */
7957 && TREE_TYPE (TREE_OPERAND (exp, 1)) != void_type_node)
7958 store_expr (TREE_OPERAND (exp, 1), temp, 0);
7960 expand_expr (TREE_OPERAND (exp, 1),
7961 ignore ? const0_rtx : NULL_RTX, VOIDmode, 0);
7962 end_cleanup_deferral ();
7964 emit_jump_insn (gen_jump (op1));
7967 start_cleanup_deferral ();
7969 && TREE_TYPE (TREE_OPERAND (exp, 2)) != void_type_node)
7970 store_expr (TREE_OPERAND (exp, 2), temp, 0);
7972 expand_expr (TREE_OPERAND (exp, 2),
7973 ignore ? const0_rtx : NULL_RTX, VOIDmode, 0);
7976 end_cleanup_deferral ();
7987 /* Something needs to be initialized, but we didn't know
7988 where that thing was when building the tree. For example,
7989 it could be the return value of a function, or a parameter
7990 to a function which lays down in the stack, or a temporary
7991 variable which must be passed by reference.
7993 We guarantee that the expression will either be constructed
7994 or copied into our original target. */
7996 tree slot = TREE_OPERAND (exp, 0);
7997 tree cleanups = NULL_TREE;
8000 if (TREE_CODE (slot) != VAR_DECL)
8004 target = original_target;
8006 /* Set this here so that if we get a target that refers to a
8007 register variable that's already been used, put_reg_into_stack
8008 knows that it should fix up those uses. */
8009 TREE_USED (slot) = 1;
8013 if (DECL_RTL (slot) != 0)
8015 target = DECL_RTL (slot);
8016 /* If we have already expanded the slot, so don't do
8018 if (TREE_OPERAND (exp, 1) == NULL_TREE)
8023 target = assign_temp (type, 2, 0, 1);
8024 /* All temp slots at this level must not conflict. */
8025 preserve_temp_slots (target);
8026 DECL_RTL (slot) = target;
8027 if (TREE_ADDRESSABLE (slot))
8029 TREE_ADDRESSABLE (slot) = 0;
8030 mark_addressable (slot);
8033 /* Since SLOT is not known to the called function
8034 to belong to its stack frame, we must build an explicit
8035 cleanup. This case occurs when we must build up a reference
8036 to pass the reference as an argument. In this case,
8037 it is very likely that such a reference need not be
8040 if (TREE_OPERAND (exp, 2) == 0)
8041 TREE_OPERAND (exp, 2) = maybe_build_cleanup (slot);
8042 cleanups = TREE_OPERAND (exp, 2);
8047 /* This case does occur, when expanding a parameter which
8048 needs to be constructed on the stack. The target
8049 is the actual stack address that we want to initialize.
8050 The function we call will perform the cleanup in this case. */
8052 /* If we have already assigned it space, use that space,
8053 not target that we were passed in, as our target
8054 parameter is only a hint. */
8055 if (DECL_RTL (slot) != 0)
8057 target = DECL_RTL (slot);
8058 /* If we have already expanded the slot, so don't do
8060 if (TREE_OPERAND (exp, 1) == NULL_TREE)
8065 DECL_RTL (slot) = target;
8066 /* If we must have an addressable slot, then make sure that
8067 the RTL that we just stored in slot is OK. */
8068 if (TREE_ADDRESSABLE (slot))
8070 TREE_ADDRESSABLE (slot) = 0;
8071 mark_addressable (slot);
8076 exp1 = TREE_OPERAND (exp, 3) = TREE_OPERAND (exp, 1);
8077 /* Mark it as expanded. */
8078 TREE_OPERAND (exp, 1) = NULL_TREE;
8080 store_expr (exp1, target, 0);
8082 expand_decl_cleanup (NULL_TREE, cleanups);
8089 tree lhs = TREE_OPERAND (exp, 0);
8090 tree rhs = TREE_OPERAND (exp, 1);
8091 tree noncopied_parts = 0;
8092 tree lhs_type = TREE_TYPE (lhs);
8094 temp = expand_assignment (lhs, rhs, ! ignore, original_target != 0);
8095 if (TYPE_NONCOPIED_PARTS (lhs_type) != 0 && !fixed_type_p (rhs))
8096 noncopied_parts = init_noncopied_parts (stabilize_reference (lhs),
8097 TYPE_NONCOPIED_PARTS (lhs_type));
8098 while (noncopied_parts != 0)
8100 expand_assignment (TREE_VALUE (noncopied_parts),
8101 TREE_PURPOSE (noncopied_parts), 0, 0);
8102 noncopied_parts = TREE_CHAIN (noncopied_parts);
8109 /* If lhs is complex, expand calls in rhs before computing it.
8110 That's so we don't compute a pointer and save it over a call.
8111 If lhs is simple, compute it first so we can give it as a
8112 target if the rhs is just a call. This avoids an extra temp and copy
8113 and that prevents a partial-subsumption which makes bad code.
8114 Actually we could treat component_ref's of vars like vars. */
8116 tree lhs = TREE_OPERAND (exp, 0);
8117 tree rhs = TREE_OPERAND (exp, 1);
8118 tree noncopied_parts = 0;
8119 tree lhs_type = TREE_TYPE (lhs);
8123 if (TREE_CODE (lhs) != VAR_DECL
8124 && TREE_CODE (lhs) != RESULT_DECL
8125 && TREE_CODE (lhs) != PARM_DECL
8126 && ! (TREE_CODE (lhs) == INDIRECT_REF
8127 && TYPE_READONLY (TREE_TYPE (TREE_OPERAND (lhs, 0)))))
8128 preexpand_calls (exp);
8130 /* Check for |= or &= of a bitfield of size one into another bitfield
8131 of size 1. In this case, (unless we need the result of the
8132 assignment) we can do this more efficiently with a
8133 test followed by an assignment, if necessary.
8135 ??? At this point, we can't get a BIT_FIELD_REF here. But if
8136 things change so we do, this code should be enhanced to
8139 && TREE_CODE (lhs) == COMPONENT_REF
8140 && (TREE_CODE (rhs) == BIT_IOR_EXPR
8141 || TREE_CODE (rhs) == BIT_AND_EXPR)
8142 && TREE_OPERAND (rhs, 0) == lhs
8143 && TREE_CODE (TREE_OPERAND (rhs, 1)) == COMPONENT_REF
8144 && TREE_INT_CST_LOW (DECL_SIZE (TREE_OPERAND (lhs, 1))) == 1
8145 && TREE_INT_CST_LOW (DECL_SIZE (TREE_OPERAND (TREE_OPERAND (rhs, 1), 1))) == 1)
8147 rtx label = gen_label_rtx ();
8149 do_jump (TREE_OPERAND (rhs, 1),
8150 TREE_CODE (rhs) == BIT_IOR_EXPR ? label : 0,
8151 TREE_CODE (rhs) == BIT_AND_EXPR ? label : 0);
8152 expand_assignment (lhs, convert (TREE_TYPE (rhs),
8153 (TREE_CODE (rhs) == BIT_IOR_EXPR
8155 : integer_zero_node)),
8157 do_pending_stack_adjust ();
8162 if (TYPE_NONCOPIED_PARTS (lhs_type) != 0
8163 && ! (fixed_type_p (lhs) && fixed_type_p (rhs)))
8164 noncopied_parts = save_noncopied_parts (stabilize_reference (lhs),
8165 TYPE_NONCOPIED_PARTS (lhs_type));
8167 temp = expand_assignment (lhs, rhs, ! ignore, original_target != 0);
8168 while (noncopied_parts != 0)
8170 expand_assignment (TREE_PURPOSE (noncopied_parts),
8171 TREE_VALUE (noncopied_parts), 0, 0);
8172 noncopied_parts = TREE_CHAIN (noncopied_parts);
8178 if (!TREE_OPERAND (exp, 0))
8179 expand_null_return ();
8181 expand_return (TREE_OPERAND (exp, 0));
8184 case PREINCREMENT_EXPR:
8185 case PREDECREMENT_EXPR:
8186 return expand_increment (exp, 0, ignore);
8188 case POSTINCREMENT_EXPR:
8189 case POSTDECREMENT_EXPR:
8190 /* Faster to treat as pre-increment if result is not used. */
8191 return expand_increment (exp, ! ignore, ignore);
8194 /* If nonzero, TEMP will be set to the address of something that might
8195 be a MEM corresponding to a stack slot. */
8198 /* Are we taking the address of a nested function? */
8199 if (TREE_CODE (TREE_OPERAND (exp, 0)) == FUNCTION_DECL
8200 && decl_function_context (TREE_OPERAND (exp, 0)) != 0
8201 && ! DECL_NO_STATIC_CHAIN (TREE_OPERAND (exp, 0))
8202 && ! TREE_STATIC (exp))
8204 op0 = trampoline_address (TREE_OPERAND (exp, 0));
8205 op0 = force_operand (op0, target);
8207 /* If we are taking the address of something erroneous, just
8209 else if (TREE_CODE (TREE_OPERAND (exp, 0)) == ERROR_MARK)
8213 /* We make sure to pass const0_rtx down if we came in with
8214 ignore set, to avoid doing the cleanups twice for something. */
8215 op0 = expand_expr (TREE_OPERAND (exp, 0),
8216 ignore ? const0_rtx : NULL_RTX, VOIDmode,
8217 (modifier == EXPAND_INITIALIZER
8218 ? modifier : EXPAND_CONST_ADDRESS));
8220 /* If we are going to ignore the result, OP0 will have been set
8221 to const0_rtx, so just return it. Don't get confused and
8222 think we are taking the address of the constant. */
8226 op0 = protect_from_queue (op0, 0);
8228 /* We would like the object in memory. If it is a constant, we can
8229 have it be statically allocated into memory. For a non-constant,
8230 we need to allocate some memory and store the value into it. */
8232 if (CONSTANT_P (op0))
8233 op0 = force_const_mem (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))),
8235 else if (GET_CODE (op0) == MEM)
8237 mark_temp_addr_taken (op0);
8238 temp = XEXP (op0, 0);
8241 else if (GET_CODE (op0) == REG || GET_CODE (op0) == SUBREG
8242 || GET_CODE (op0) == CONCAT || GET_CODE (op0) == ADDRESSOF)
8244 /* If this object is in a register, it must be not
8246 tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
8247 rtx memloc = assign_temp (inner_type, 1, 1, 1);
8249 mark_temp_addr_taken (memloc);
8250 emit_move_insn (memloc, op0);
8254 if (GET_CODE (op0) != MEM)
8257 if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
8259 temp = XEXP (op0, 0);
8260 #ifdef POINTERS_EXTEND_UNSIGNED
8261 if (GET_MODE (temp) == Pmode && GET_MODE (temp) != mode
8262 && mode == ptr_mode)
8263 temp = convert_memory_address (ptr_mode, temp);
8268 op0 = force_operand (XEXP (op0, 0), target);
8271 if (flag_force_addr && GET_CODE (op0) != REG)
8272 op0 = force_reg (Pmode, op0);
8274 if (GET_CODE (op0) == REG
8275 && ! REG_USERVAR_P (op0))
8276 mark_reg_pointer (op0, TYPE_ALIGN (TREE_TYPE (type)) / BITS_PER_UNIT);
8278 /* If we might have had a temp slot, add an equivalent address
8281 update_temp_slot_address (temp, op0);
8283 #ifdef POINTERS_EXTEND_UNSIGNED
8284 if (GET_MODE (op0) == Pmode && GET_MODE (op0) != mode
8285 && mode == ptr_mode)
8286 op0 = convert_memory_address (ptr_mode, op0);
8291 case ENTRY_VALUE_EXPR:
8294 /* COMPLEX type for Extended Pascal & Fortran */
8297 enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
8300 /* Get the rtx code of the operands. */
8301 op0 = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0);
8302 op1 = expand_expr (TREE_OPERAND (exp, 1), 0, VOIDmode, 0);
8305 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
8309 /* Move the real (op0) and imaginary (op1) parts to their location. */
8310 emit_move_insn (gen_realpart (mode, target), op0);
8311 emit_move_insn (gen_imagpart (mode, target), op1);
8313 insns = get_insns ();
8316 /* Complex construction should appear as a single unit. */
8317 /* If TARGET is a CONCAT, we got insns like RD = RS, ID = IS,
8318 each with a separate pseudo as destination.
8319 It's not correct for flow to treat them as a unit. */
8320 if (GET_CODE (target) != CONCAT)
8321 emit_no_conflict_block (insns, target, op0, op1, NULL_RTX);
8329 op0 = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0);
8330 return gen_realpart (mode, op0);
8333 op0 = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0);
8334 return gen_imagpart (mode, op0);
8338 enum machine_mode partmode = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
8342 op0 = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0);
8345 target = gen_reg_rtx (mode);
8349 /* Store the realpart and the negated imagpart to target. */
8350 emit_move_insn (gen_realpart (partmode, target),
8351 gen_realpart (partmode, op0));
8353 imag_t = gen_imagpart (partmode, target);
8354 temp = expand_unop (partmode, neg_optab,
8355 gen_imagpart (partmode, op0), imag_t, 0);
8357 emit_move_insn (imag_t, temp);
8359 insns = get_insns ();
8362 /* Conjugate should appear as a single unit
8363 If TARGET is a CONCAT, we got insns like RD = RS, ID = - IS,
8364 each with a separate pseudo as destination.
8365 It's not correct for flow to treat them as a unit. */
8366 if (GET_CODE (target) != CONCAT)
8367 emit_no_conflict_block (insns, target, op0, NULL_RTX, NULL_RTX);
8374 case TRY_CATCH_EXPR:
8376 tree handler = TREE_OPERAND (exp, 1);
8378 expand_eh_region_start ();
8380 op0 = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0);
8382 expand_eh_region_end (handler);
8387 case TRY_FINALLY_EXPR:
8389 tree try_block = TREE_OPERAND (exp, 0);
8390 tree finally_block = TREE_OPERAND (exp, 1);
8391 rtx finally_label = gen_label_rtx ();
8392 rtx done_label = gen_label_rtx ();
8393 rtx return_link = gen_reg_rtx (Pmode);
8394 tree cleanup = build (GOTO_SUBROUTINE_EXPR, void_type_node,
8395 (tree) finally_label, (tree) return_link);
8396 TREE_SIDE_EFFECTS (cleanup) = 1;
8398 /* Start a new binding layer that will keep track of all cleanup
8399 actions to be performed. */
8400 expand_start_bindings (2);
8402 target_temp_slot_level = temp_slot_level;
8404 expand_decl_cleanup (NULL_TREE, cleanup);
8405 op0 = expand_expr (try_block, target, tmode, modifier);
8407 preserve_temp_slots (op0);
8408 expand_end_bindings (NULL_TREE, 0, 0);
8409 emit_jump (done_label);
8410 emit_label (finally_label);
8411 expand_expr (finally_block, const0_rtx, VOIDmode, 0);
8412 emit_indirect_jump (return_link);
8413 emit_label (done_label);
8417 case GOTO_SUBROUTINE_EXPR:
8419 rtx subr = (rtx) TREE_OPERAND (exp, 0);
8420 rtx return_link = *(rtx *) &TREE_OPERAND (exp, 1);
8421 rtx return_address = gen_label_rtx ();
8422 emit_move_insn (return_link, gen_rtx_LABEL_REF (Pmode, return_address));
8424 emit_label (return_address);
8430 rtx dcc = get_dynamic_cleanup_chain ();
8431 emit_move_insn (dcc, validize_mem (gen_rtx_MEM (Pmode, dcc)));
8437 rtx dhc = get_dynamic_handler_chain ();
8438 emit_move_insn (dhc, validize_mem (gen_rtx_MEM (Pmode, dhc)));
8443 return expand_builtin_va_arg (TREE_OPERAND (exp, 0), type);
8446 return (*lang_expand_expr) (exp, original_target, tmode, modifier);
8449 /* Here to do an ordinary binary operator, generating an instruction
8450 from the optab already placed in `this_optab'. */
8452 preexpand_calls (exp);
8453 if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
8455 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
8456 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
8458 temp = expand_binop (mode, this_optab, op0, op1, target,
8459 unsignedp, OPTAB_LIB_WIDEN);
8465 /* Similar to expand_expr, except that we don't specify a target, target
8466 mode, or modifier and we return the alignment of the inner type. This is
8467 used in cases where it is not necessary to align the result to the
8468 alignment of its type as long as we know the alignment of the result, for
8469 example for comparisons of BLKmode values. */
8472 expand_expr_unaligned (exp, palign)
8474 unsigned int *palign;
8477 tree type = TREE_TYPE (exp);
8478 register enum machine_mode mode = TYPE_MODE (type);
8480 /* Default the alignment we return to that of the type. */
8481 *palign = TYPE_ALIGN (type);
8483 /* The only cases in which we do anything special is if the resulting mode
8485 if (mode != BLKmode)
8486 return expand_expr (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL);
8488 switch (TREE_CODE (exp))
8492 case NON_LVALUE_EXPR:
8493 /* Conversions between BLKmode values don't change the underlying
8494 alignment or value. */
8495 if (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == BLKmode)
8496 return expand_expr_unaligned (TREE_OPERAND (exp, 0), palign);
8500 /* Much of the code for this case is copied directly from expand_expr.
8501 We need to duplicate it here because we will do something different
8502 in the fall-through case, so we need to handle the same exceptions
8505 tree array = TREE_OPERAND (exp, 0);
8506 tree domain = TYPE_DOMAIN (TREE_TYPE (array));
8507 tree low_bound = domain ? TYPE_MIN_VALUE (domain) : integer_zero_node;
8508 tree index = convert (sizetype, TREE_OPERAND (exp, 1));
8511 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) != ARRAY_TYPE)
8514 /* Optimize the special-case of a zero lower bound.
8516 We convert the low_bound to sizetype to avoid some problems
8517 with constant folding. (E.g. suppose the lower bound is 1,
8518 and its mode is QI. Without the conversion, (ARRAY
8519 +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1))
8520 +INDEX), which becomes (ARRAY+255+INDEX). Oops!) */
8522 if (! integer_zerop (low_bound))
8523 index = size_diffop (index, convert (sizetype, low_bound));
8525 /* If this is a constant index into a constant array,
8526 just get the value from the array. Handle both the cases when
8527 we have an explicit constructor and when our operand is a variable
8528 that was declared const. */
8530 if (TREE_CODE (array) == CONSTRUCTOR && ! TREE_SIDE_EFFECTS (array))
8532 if (TREE_CODE (index) == INTEGER_CST
8533 && TREE_INT_CST_HIGH (index) == 0)
8535 tree elem = CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0));
8537 i = TREE_INT_CST_LOW (index);
8539 elem = TREE_CHAIN (elem);
8541 return expand_expr_unaligned (fold (TREE_VALUE (elem)),
8546 else if (optimize >= 1
8547 && TREE_READONLY (array) && ! TREE_SIDE_EFFECTS (array)
8548 && TREE_CODE (array) == VAR_DECL && DECL_INITIAL (array)
8549 && TREE_CODE (DECL_INITIAL (array)) != ERROR_MARK)
8551 if (TREE_CODE (index) == INTEGER_CST)
8553 tree init = DECL_INITIAL (array);
8555 i = TREE_INT_CST_LOW (index);
8556 if (TREE_CODE (init) == CONSTRUCTOR)
8558 tree elem = CONSTRUCTOR_ELTS (init);
8561 && !tree_int_cst_equal (TREE_PURPOSE (elem), index))
8562 elem = TREE_CHAIN (elem);
8564 return expand_expr_unaligned (fold (TREE_VALUE (elem)),
8571 /* ... fall through ... */
8575 /* If the operand is a CONSTRUCTOR, we can just extract the
8576 appropriate field if it is present. Don't do this if we have
8577 already written the data since we want to refer to that copy
8578 and varasm.c assumes that's what we'll do. */
8579 if (TREE_CODE (exp) != ARRAY_REF
8580 && TREE_CODE (TREE_OPERAND (exp, 0)) == CONSTRUCTOR
8581 && TREE_CST_RTL (TREE_OPERAND (exp, 0)) == 0)
8585 for (elt = CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0)); elt;
8586 elt = TREE_CHAIN (elt))
8587 if (TREE_PURPOSE (elt) == TREE_OPERAND (exp, 1))
8588 /* Note that unlike the case in expand_expr, we know this is
8589 BLKmode and hence not an integer. */
8590 return expand_expr_unaligned (TREE_VALUE (elt), palign);
8594 enum machine_mode mode1;
8599 unsigned int alignment;
8601 tree tem = get_inner_reference (exp, &bitsize, &bitpos, &offset,
8602 &mode1, &unsignedp, &volatilep,
8605 /* If we got back the original object, something is wrong. Perhaps
8606 we are evaluating an expression too early. In any event, don't
8607 infinitely recurse. */
8611 op0 = expand_expr (tem, NULL_RTX, VOIDmode, EXPAND_NORMAL);
8613 /* If this is a constant, put it into a register if it is a
8614 legitimate constant and OFFSET is 0 and memory if it isn't. */
8615 if (CONSTANT_P (op0))
8617 enum machine_mode inner_mode = TYPE_MODE (TREE_TYPE (tem));
8619 if (inner_mode != BLKmode && LEGITIMATE_CONSTANT_P (op0)
8621 op0 = force_reg (inner_mode, op0);
8623 op0 = validize_mem (force_const_mem (inner_mode, op0));
8628 rtx offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, 0);
8630 /* If this object is in a register, put it into memory.
8631 This case can't occur in C, but can in Ada if we have
8632 unchecked conversion of an expression from a scalar type to
8633 an array or record type. */
8634 if (GET_CODE (op0) == REG || GET_CODE (op0) == SUBREG
8635 || GET_CODE (op0) == CONCAT || GET_CODE (op0) == ADDRESSOF)
8637 rtx memloc = assign_temp (TREE_TYPE (tem), 1, 1, 1);
8639 mark_temp_addr_taken (memloc);
8640 emit_move_insn (memloc, op0);
8644 if (GET_CODE (op0) != MEM)
8647 if (GET_MODE (offset_rtx) != ptr_mode)
8649 #ifdef POINTERS_EXTEND_UNSIGNED
8650 offset_rtx = convert_memory_address (ptr_mode, offset_rtx);
8652 offset_rtx = convert_to_mode (ptr_mode, offset_rtx, 0);
8656 op0 = change_address (op0, VOIDmode,
8657 gen_rtx_PLUS (ptr_mode, XEXP (op0, 0),
8658 force_reg (ptr_mode,
8662 /* Don't forget about volatility even if this is a bitfield. */
8663 if (GET_CODE (op0) == MEM && volatilep && ! MEM_VOLATILE_P (op0))
8665 op0 = copy_rtx (op0);
8666 MEM_VOLATILE_P (op0) = 1;
8669 /* Check the access. */
8670 if (current_function_check_memory_usage && GET_CODE (op0) == MEM)
8675 to = plus_constant (XEXP (op0, 0), (bitpos / BITS_PER_UNIT));
8676 size = (bitpos % BITS_PER_UNIT) + bitsize + BITS_PER_UNIT - 1;
8678 /* Check the access right of the pointer. */
8679 if (size > BITS_PER_UNIT)
8680 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
8681 to, ptr_mode, GEN_INT (size / BITS_PER_UNIT),
8682 TYPE_MODE (sizetype),
8683 GEN_INT (MEMORY_USE_RO),
8684 TYPE_MODE (integer_type_node));
8687 /* In cases where an aligned union has an unaligned object
8688 as a field, we might be extracting a BLKmode value from
8689 an integer-mode (e.g., SImode) object. Handle this case
8690 by doing the extract into an object as wide as the field
8691 (which we know to be the width of a basic mode), then
8692 storing into memory, and changing the mode to BLKmode.
8693 If we ultimately want the address (EXPAND_CONST_ADDRESS or
8694 EXPAND_INITIALIZER), then we must not copy to a temporary. */
8695 if (mode1 == VOIDmode
8696 || GET_CODE (op0) == REG || GET_CODE (op0) == SUBREG
8697 || (SLOW_UNALIGNED_ACCESS (mode1, alignment)
8698 && (TYPE_ALIGN (type) > alignment * BITS_PER_UNIT
8699 || bitpos % TYPE_ALIGN (type) != 0)))
8701 enum machine_mode ext_mode = mode_for_size (bitsize, MODE_INT, 1);
8703 if (ext_mode == BLKmode)
8705 /* In this case, BITPOS must start at a byte boundary. */
8706 if (GET_CODE (op0) != MEM
8707 || bitpos % BITS_PER_UNIT != 0)
8710 op0 = change_address (op0, VOIDmode,
8711 plus_constant (XEXP (op0, 0),
8712 bitpos / BITS_PER_UNIT));
8716 rtx new = assign_stack_temp (ext_mode,
8717 bitsize / BITS_PER_UNIT, 0);
8719 op0 = extract_bit_field (validize_mem (op0), bitsize, bitpos,
8720 unsignedp, NULL_RTX, ext_mode,
8721 ext_mode, alignment,
8722 int_size_in_bytes (TREE_TYPE (tem)));
8724 /* If the result is a record type and BITSIZE is narrower than
8725 the mode of OP0, an integral mode, and this is a big endian
8726 machine, we must put the field into the high-order bits. */
8727 if (TREE_CODE (type) == RECORD_TYPE && BYTES_BIG_ENDIAN
8728 && GET_MODE_CLASS (GET_MODE (op0)) == MODE_INT
8729 && bitsize < GET_MODE_BITSIZE (GET_MODE (op0)))
8730 op0 = expand_shift (LSHIFT_EXPR, GET_MODE (op0), op0,
8731 size_int (GET_MODE_BITSIZE
8737 emit_move_insn (new, op0);
8738 op0 = copy_rtx (new);
8739 PUT_MODE (op0, BLKmode);
8743 /* Get a reference to just this component. */
8744 op0 = change_address (op0, mode1,
8745 plus_constant (XEXP (op0, 0),
8746 (bitpos / BITS_PER_UNIT)));
8748 MEM_ALIAS_SET (op0) = get_alias_set (exp);
8750 /* Adjust the alignment in case the bit position is not
8751 a multiple of the alignment of the inner object. */
8752 while (bitpos % alignment != 0)
8755 if (GET_CODE (XEXP (op0, 0)) == REG)
8756 mark_reg_pointer (XEXP (op0, 0), alignment);
8758 MEM_IN_STRUCT_P (op0) = 1;
8759 MEM_VOLATILE_P (op0) |= volatilep;
8761 *palign = alignment;
8770 return expand_expr (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL);
8773 /* Return the tree node if a ARG corresponds to a string constant or zero
8774 if it doesn't. If we return non-zero, set *PTR_OFFSET to the offset
8775 in bytes within the string that ARG is accessing. The type of the
8776 offset will be `sizetype'. */
8779 string_constant (arg, ptr_offset)
8785 if (TREE_CODE (arg) == ADDR_EXPR
8786 && TREE_CODE (TREE_OPERAND (arg, 0)) == STRING_CST)
8788 *ptr_offset = size_zero_node;
8789 return TREE_OPERAND (arg, 0);
8791 else if (TREE_CODE (arg) == PLUS_EXPR)
8793 tree arg0 = TREE_OPERAND (arg, 0);
8794 tree arg1 = TREE_OPERAND (arg, 1);
8799 if (TREE_CODE (arg0) == ADDR_EXPR
8800 && TREE_CODE (TREE_OPERAND (arg0, 0)) == STRING_CST)
8802 *ptr_offset = convert (sizetype, arg1);
8803 return TREE_OPERAND (arg0, 0);
8805 else if (TREE_CODE (arg1) == ADDR_EXPR
8806 && TREE_CODE (TREE_OPERAND (arg1, 0)) == STRING_CST)
8808 *ptr_offset = convert (sizetype, arg0);
8809 return TREE_OPERAND (arg1, 0);
8816 /* Expand code for a post- or pre- increment or decrement
8817 and return the RTX for the result.
8818 POST is 1 for postinc/decrements and 0 for preinc/decrements. */
8821 expand_increment (exp, post, ignore)
8825 register rtx op0, op1;
8826 register rtx temp, value;
8827 register tree incremented = TREE_OPERAND (exp, 0);
8828 optab this_optab = add_optab;
8830 enum machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
8831 int op0_is_copy = 0;
8832 int single_insn = 0;
8833 /* 1 means we can't store into OP0 directly,
8834 because it is a subreg narrower than a word,
8835 and we don't dare clobber the rest of the word. */
8838 /* Stabilize any component ref that might need to be
8839 evaluated more than once below. */
8841 || TREE_CODE (incremented) == BIT_FIELD_REF
8842 || (TREE_CODE (incremented) == COMPONENT_REF
8843 && (TREE_CODE (TREE_OPERAND (incremented, 0)) != INDIRECT_REF
8844 || DECL_BIT_FIELD (TREE_OPERAND (incremented, 1)))))
8845 incremented = stabilize_reference (incremented);
8846 /* Nested *INCREMENT_EXPRs can happen in C++. We must force innermost
8847 ones into save exprs so that they don't accidentally get evaluated
8848 more than once by the code below. */
8849 if (TREE_CODE (incremented) == PREINCREMENT_EXPR
8850 || TREE_CODE (incremented) == PREDECREMENT_EXPR)
8851 incremented = save_expr (incremented);
8853 /* Compute the operands as RTX.
8854 Note whether OP0 is the actual lvalue or a copy of it:
8855 I believe it is a copy iff it is a register or subreg
8856 and insns were generated in computing it. */
8858 temp = get_last_insn ();
8859 op0 = expand_expr (incremented, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_RW);
8861 /* If OP0 is a SUBREG made for a promoted variable, we cannot increment
8862 in place but instead must do sign- or zero-extension during assignment,
8863 so we copy it into a new register and let the code below use it as
8866 Note that we can safely modify this SUBREG since it is know not to be
8867 shared (it was made by the expand_expr call above). */
8869 if (GET_CODE (op0) == SUBREG && SUBREG_PROMOTED_VAR_P (op0))
8872 SUBREG_REG (op0) = copy_to_reg (SUBREG_REG (op0));
8876 else if (GET_CODE (op0) == SUBREG
8877 && GET_MODE_BITSIZE (GET_MODE (op0)) < BITS_PER_WORD)
8879 /* We cannot increment this SUBREG in place. If we are
8880 post-incrementing, get a copy of the old value. Otherwise,
8881 just mark that we cannot increment in place. */
8883 op0 = copy_to_reg (op0);
8888 op0_is_copy = ((GET_CODE (op0) == SUBREG || GET_CODE (op0) == REG)
8889 && temp != get_last_insn ());
8890 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode,
8891 EXPAND_MEMORY_USE_BAD);
8893 /* Decide whether incrementing or decrementing. */
8894 if (TREE_CODE (exp) == POSTDECREMENT_EXPR
8895 || TREE_CODE (exp) == PREDECREMENT_EXPR)
8896 this_optab = sub_optab;
8898 /* Convert decrement by a constant into a negative increment. */
8899 if (this_optab == sub_optab
8900 && GET_CODE (op1) == CONST_INT)
8902 op1 = GEN_INT (- INTVAL (op1));
8903 this_optab = add_optab;
8906 /* For a preincrement, see if we can do this with a single instruction. */
8909 icode = (int) this_optab->handlers[(int) mode].insn_code;
8910 if (icode != (int) CODE_FOR_nothing
8911 /* Make sure that OP0 is valid for operands 0 and 1
8912 of the insn we want to queue. */
8913 && (*insn_data[icode].operand[0].predicate) (op0, mode)
8914 && (*insn_data[icode].operand[1].predicate) (op0, mode)
8915 && (*insn_data[icode].operand[2].predicate) (op1, mode))
8919 /* If OP0 is not the actual lvalue, but rather a copy in a register,
8920 then we cannot just increment OP0. We must therefore contrive to
8921 increment the original value. Then, for postincrement, we can return
8922 OP0 since it is a copy of the old value. For preincrement, expand here
8923 unless we can do it with a single insn.
8925 Likewise if storing directly into OP0 would clobber high bits
8926 we need to preserve (bad_subreg). */
8927 if (op0_is_copy || (!post && !single_insn) || bad_subreg)
8929 /* This is the easiest way to increment the value wherever it is.
8930 Problems with multiple evaluation of INCREMENTED are prevented
8931 because either (1) it is a component_ref or preincrement,
8932 in which case it was stabilized above, or (2) it is an array_ref
8933 with constant index in an array in a register, which is
8934 safe to reevaluate. */
8935 tree newexp = build (((TREE_CODE (exp) == POSTDECREMENT_EXPR
8936 || TREE_CODE (exp) == PREDECREMENT_EXPR)
8937 ? MINUS_EXPR : PLUS_EXPR),
8940 TREE_OPERAND (exp, 1));
8942 while (TREE_CODE (incremented) == NOP_EXPR
8943 || TREE_CODE (incremented) == CONVERT_EXPR)
8945 newexp = convert (TREE_TYPE (incremented), newexp);
8946 incremented = TREE_OPERAND (incremented, 0);
8949 temp = expand_assignment (incremented, newexp, ! post && ! ignore , 0);
8950 return post ? op0 : temp;
8955 /* We have a true reference to the value in OP0.
8956 If there is an insn to add or subtract in this mode, queue it.
8957 Queueing the increment insn avoids the register shuffling
8958 that often results if we must increment now and first save
8959 the old value for subsequent use. */
8961 #if 0 /* Turned off to avoid making extra insn for indexed memref. */
8962 op0 = stabilize (op0);
8965 icode = (int) this_optab->handlers[(int) mode].insn_code;
8966 if (icode != (int) CODE_FOR_nothing
8967 /* Make sure that OP0 is valid for operands 0 and 1
8968 of the insn we want to queue. */
8969 && (*insn_data[icode].operand[0].predicate) (op0, mode)
8970 && (*insn_data[icode].operand[1].predicate) (op0, mode))
8972 if (! (*insn_data[icode].operand[2].predicate) (op1, mode))
8973 op1 = force_reg (mode, op1);
8975 return enqueue_insn (op0, GEN_FCN (icode) (op0, op0, op1));
8977 if (icode != (int) CODE_FOR_nothing && GET_CODE (op0) == MEM)
8979 rtx addr = (general_operand (XEXP (op0, 0), mode)
8980 ? force_reg (Pmode, XEXP (op0, 0))
8981 : copy_to_reg (XEXP (op0, 0)));
8984 op0 = change_address (op0, VOIDmode, addr);
8985 temp = force_reg (GET_MODE (op0), op0);
8986 if (! (*insn_data[icode].operand[2].predicate) (op1, mode))
8987 op1 = force_reg (mode, op1);
8989 /* The increment queue is LIFO, thus we have to `queue'
8990 the instructions in reverse order. */
8991 enqueue_insn (op0, gen_move_insn (op0, temp));
8992 result = enqueue_insn (temp, GEN_FCN (icode) (temp, temp, op1));
8997 /* Preincrement, or we can't increment with one simple insn. */
8999 /* Save a copy of the value before inc or dec, to return it later. */
9000 temp = value = copy_to_reg (op0);
9002 /* Arrange to return the incremented value. */
9003 /* Copy the rtx because expand_binop will protect from the queue,
9004 and the results of that would be invalid for us to return
9005 if our caller does emit_queue before using our result. */
9006 temp = copy_rtx (value = op0);
9008 /* Increment however we can. */
9009 op1 = expand_binop (mode, this_optab, value, op1,
9010 current_function_check_memory_usage ? NULL_RTX : op0,
9011 TREE_UNSIGNED (TREE_TYPE (exp)), OPTAB_LIB_WIDEN);
9012 /* Make sure the value is stored into OP0. */
9014 emit_move_insn (op0, op1);
9019 /* Expand all function calls contained within EXP, innermost ones first.
9020 But don't look within expressions that have sequence points.
9021 For each CALL_EXPR, record the rtx for its value
9022 in the CALL_EXPR_RTL field. */
9025 preexpand_calls (exp)
9028 register int nops, i;
9029 int type = TREE_CODE_CLASS (TREE_CODE (exp));
9031 if (! do_preexpand_calls)
9034 /* Only expressions and references can contain calls. */
9036 if (type != 'e' && type != '<' && type != '1' && type != '2' && type != 'r')
9039 switch (TREE_CODE (exp))
9042 /* Do nothing if already expanded. */
9043 if (CALL_EXPR_RTL (exp) != 0
9044 /* Do nothing if the call returns a variable-sized object. */
9045 || TREE_CODE (TYPE_SIZE (TREE_TYPE(exp))) != INTEGER_CST
9046 /* Do nothing to built-in functions. */
9047 || (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
9048 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
9050 && DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))))
9053 CALL_EXPR_RTL (exp) = expand_call (exp, NULL_RTX, 0);
9058 case TRUTH_ANDIF_EXPR:
9059 case TRUTH_ORIF_EXPR:
9060 /* If we find one of these, then we can be sure
9061 the adjust will be done for it (since it makes jumps).
9062 Do it now, so that if this is inside an argument
9063 of a function, we don't get the stack adjustment
9064 after some other args have already been pushed. */
9065 do_pending_stack_adjust ();
9070 case WITH_CLEANUP_EXPR:
9071 case CLEANUP_POINT_EXPR:
9072 case TRY_CATCH_EXPR:
9076 if (SAVE_EXPR_RTL (exp) != 0)
9083 nops = tree_code_length[(int) TREE_CODE (exp)];
9084 for (i = 0; i < nops; i++)
9085 if (TREE_OPERAND (exp, i) != 0)
9087 if (TREE_CODE (exp) == TARGET_EXPR && i == 2)
9088 /* We don't need to preexpand the cleanup for a TARGET_EXPR.
9089 It doesn't happen before the call is made. */
9093 type = TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, i)));
9094 if (type == 'e' || type == '<' || type == '1' || type == '2'
9096 preexpand_calls (TREE_OPERAND (exp, i));
9101 /* At the start of a function, record that we have no previously-pushed
9102 arguments waiting to be popped. */
9105 init_pending_stack_adjust ()
9107 pending_stack_adjust = 0;
9110 /* When exiting from function, if safe, clear out any pending stack adjust
9111 so the adjustment won't get done.
9113 Note, if the current function calls alloca, then it must have a
9114 frame pointer regardless of the value of flag_omit_frame_pointer. */
9117 clear_pending_stack_adjust ()
9119 #ifdef EXIT_IGNORE_STACK
9121 && (! flag_omit_frame_pointer || current_function_calls_alloca)
9122 && EXIT_IGNORE_STACK
9123 && ! (DECL_INLINE (current_function_decl) && ! flag_no_inline)
9124 && ! flag_inline_functions)
9125 pending_stack_adjust = 0;
9129 /* Pop any previously-pushed arguments that have not been popped yet. */
9132 do_pending_stack_adjust ()
9134 if (inhibit_defer_pop == 0)
9136 if (pending_stack_adjust != 0)
9137 adjust_stack (GEN_INT (pending_stack_adjust));
9138 pending_stack_adjust = 0;
9142 /* Expand conditional expressions. */
9144 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.
9145 LABEL is an rtx of code CODE_LABEL, in this function and all the
9149 jumpifnot (exp, label)
9153 do_jump (exp, label, NULL_RTX);
9156 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
9163 do_jump (exp, NULL_RTX, label);
9166 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
9167 the result is zero, or IF_TRUE_LABEL if the result is one.
9168 Either of IF_FALSE_LABEL and IF_TRUE_LABEL may be zero,
9169 meaning fall through in that case.
9171 do_jump always does any pending stack adjust except when it does not
9172 actually perform a jump. An example where there is no jump
9173 is when EXP is `(foo (), 0)' and IF_FALSE_LABEL is null.
9175 This function is responsible for optimizing cases such as
9176 &&, || and comparison operators in EXP. */
9179 do_jump (exp, if_false_label, if_true_label)
9181 rtx if_false_label, if_true_label;
9183 register enum tree_code code = TREE_CODE (exp);
9184 /* Some cases need to create a label to jump to
9185 in order to properly fall through.
9186 These cases set DROP_THROUGH_LABEL nonzero. */
9187 rtx drop_through_label = 0;
9191 enum machine_mode mode;
9193 #ifdef MAX_INTEGER_COMPUTATION_MODE
9194 check_max_integer_computation_mode (exp);
9205 temp = integer_zerop (exp) ? if_false_label : if_true_label;
9211 /* This is not true with #pragma weak */
9213 /* The address of something can never be zero. */
9215 emit_jump (if_true_label);
9220 if (TREE_CODE (TREE_OPERAND (exp, 0)) == COMPONENT_REF
9221 || TREE_CODE (TREE_OPERAND (exp, 0)) == BIT_FIELD_REF
9222 || TREE_CODE (TREE_OPERAND (exp, 0)) == ARRAY_REF)
9225 /* If we are narrowing the operand, we have to do the compare in the
9227 if ((TYPE_PRECISION (TREE_TYPE (exp))
9228 < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp, 0)))))
9230 case NON_LVALUE_EXPR:
9231 case REFERENCE_EXPR:
9236 /* These cannot change zero->non-zero or vice versa. */
9237 do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
9240 case WITH_RECORD_EXPR:
9241 /* Put the object on the placeholder list, recurse through our first
9242 operand, and pop the list. */
9243 placeholder_list = tree_cons (TREE_OPERAND (exp, 1), NULL_TREE,
9245 do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
9246 placeholder_list = TREE_CHAIN (placeholder_list);
9250 /* This is never less insns than evaluating the PLUS_EXPR followed by
9251 a test and can be longer if the test is eliminated. */
9253 /* Reduce to minus. */
9254 exp = build (MINUS_EXPR, TREE_TYPE (exp),
9255 TREE_OPERAND (exp, 0),
9256 fold (build1 (NEGATE_EXPR, TREE_TYPE (TREE_OPERAND (exp, 1)),
9257 TREE_OPERAND (exp, 1))));
9258 /* Process as MINUS. */
9262 /* Non-zero iff operands of minus differ. */
9263 do_compare_and_jump (build (NE_EXPR, TREE_TYPE (exp),
9264 TREE_OPERAND (exp, 0),
9265 TREE_OPERAND (exp, 1)),
9266 NE, NE, if_false_label, if_true_label);
9270 /* If we are AND'ing with a small constant, do this comparison in the
9271 smallest type that fits. If the machine doesn't have comparisons
9272 that small, it will be converted back to the wider comparison.
9273 This helps if we are testing the sign bit of a narrower object.
9274 combine can't do this for us because it can't know whether a
9275 ZERO_EXTRACT or a compare in a smaller mode exists, but we do. */
9277 if (! SLOW_BYTE_ACCESS
9278 && TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
9279 && TYPE_PRECISION (TREE_TYPE (exp)) <= HOST_BITS_PER_WIDE_INT
9280 && (i = floor_log2 (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)))) >= 0
9281 && (mode = mode_for_size (i + 1, MODE_INT, 0)) != BLKmode
9282 && (type = type_for_mode (mode, 1)) != 0
9283 && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (exp))
9284 && (cmp_optab->handlers[(int) TYPE_MODE (type)].insn_code
9285 != CODE_FOR_nothing))
9287 do_jump (convert (type, exp), if_false_label, if_true_label);
9292 case TRUTH_NOT_EXPR:
9293 do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label);
9296 case TRUTH_ANDIF_EXPR:
9297 if (if_false_label == 0)
9298 if_false_label = drop_through_label = gen_label_rtx ();
9299 do_jump (TREE_OPERAND (exp, 0), if_false_label, NULL_RTX);
9300 start_cleanup_deferral ();
9301 do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
9302 end_cleanup_deferral ();
9305 case TRUTH_ORIF_EXPR:
9306 if (if_true_label == 0)
9307 if_true_label = drop_through_label = gen_label_rtx ();
9308 do_jump (TREE_OPERAND (exp, 0), NULL_RTX, if_true_label);
9309 start_cleanup_deferral ();
9310 do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
9311 end_cleanup_deferral ();
9316 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0);
9317 preserve_temp_slots (NULL_RTX);
9321 do_pending_stack_adjust ();
9322 do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
9329 int bitsize, bitpos, unsignedp;
9330 enum machine_mode mode;
9334 unsigned int alignment;
9336 /* Get description of this reference. We don't actually care
9337 about the underlying object here. */
9338 get_inner_reference (exp, &bitsize, &bitpos, &offset,
9339 &mode, &unsignedp, &volatilep,
9342 type = type_for_size (bitsize, unsignedp);
9343 if (! SLOW_BYTE_ACCESS
9344 && type != 0 && bitsize >= 0
9345 && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (exp))
9346 && (cmp_optab->handlers[(int) TYPE_MODE (type)].insn_code
9347 != CODE_FOR_nothing))
9349 do_jump (convert (type, exp), if_false_label, if_true_label);
9356 /* Do (a ? 1 : 0) and (a ? 0 : 1) as special cases. */
9357 if (integer_onep (TREE_OPERAND (exp, 1))
9358 && integer_zerop (TREE_OPERAND (exp, 2)))
9359 do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
9361 else if (integer_zerop (TREE_OPERAND (exp, 1))
9362 && integer_onep (TREE_OPERAND (exp, 2)))
9363 do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label);
9367 register rtx label1 = gen_label_rtx ();
9368 drop_through_label = gen_label_rtx ();
9370 do_jump (TREE_OPERAND (exp, 0), label1, NULL_RTX);
9372 start_cleanup_deferral ();
9373 /* Now the THEN-expression. */
9374 do_jump (TREE_OPERAND (exp, 1),
9375 if_false_label ? if_false_label : drop_through_label,
9376 if_true_label ? if_true_label : drop_through_label);
9377 /* In case the do_jump just above never jumps. */
9378 do_pending_stack_adjust ();
9379 emit_label (label1);
9381 /* Now the ELSE-expression. */
9382 do_jump (TREE_OPERAND (exp, 2),
9383 if_false_label ? if_false_label : drop_through_label,
9384 if_true_label ? if_true_label : drop_through_label);
9385 end_cleanup_deferral ();
9391 tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
9393 if (GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_COMPLEX_FLOAT
9394 || GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_COMPLEX_INT)
9396 tree exp0 = save_expr (TREE_OPERAND (exp, 0));
9397 tree exp1 = save_expr (TREE_OPERAND (exp, 1));
9400 (build (TRUTH_ANDIF_EXPR, TREE_TYPE (exp),
9401 fold (build (EQ_EXPR, TREE_TYPE (exp),
9402 fold (build1 (REALPART_EXPR,
9403 TREE_TYPE (inner_type),
9405 fold (build1 (REALPART_EXPR,
9406 TREE_TYPE (inner_type),
9408 fold (build (EQ_EXPR, TREE_TYPE (exp),
9409 fold (build1 (IMAGPART_EXPR,
9410 TREE_TYPE (inner_type),
9412 fold (build1 (IMAGPART_EXPR,
9413 TREE_TYPE (inner_type),
9415 if_false_label, if_true_label);
9418 else if (integer_zerop (TREE_OPERAND (exp, 1)))
9419 do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label);
9421 else if (GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_INT
9422 && !can_compare_p (EQ, TYPE_MODE (inner_type), ccp_jump))
9423 do_jump_by_parts_equality (exp, if_false_label, if_true_label);
9425 do_compare_and_jump (exp, EQ, EQ, if_false_label, if_true_label);
9431 tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
9433 if (GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_COMPLEX_FLOAT
9434 || GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_COMPLEX_INT)
9436 tree exp0 = save_expr (TREE_OPERAND (exp, 0));
9437 tree exp1 = save_expr (TREE_OPERAND (exp, 1));
9440 (build (TRUTH_ORIF_EXPR, TREE_TYPE (exp),
9441 fold (build (NE_EXPR, TREE_TYPE (exp),
9442 fold (build1 (REALPART_EXPR,
9443 TREE_TYPE (inner_type),
9445 fold (build1 (REALPART_EXPR,
9446 TREE_TYPE (inner_type),
9448 fold (build (NE_EXPR, TREE_TYPE (exp),
9449 fold (build1 (IMAGPART_EXPR,
9450 TREE_TYPE (inner_type),
9452 fold (build1 (IMAGPART_EXPR,
9453 TREE_TYPE (inner_type),
9455 if_false_label, if_true_label);
9458 else if (integer_zerop (TREE_OPERAND (exp, 1)))
9459 do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
9461 else if (GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_INT
9462 && !can_compare_p (NE, TYPE_MODE (inner_type), ccp_jump))
9463 do_jump_by_parts_equality (exp, if_true_label, if_false_label);
9465 do_compare_and_jump (exp, NE, NE, if_false_label, if_true_label);
9470 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9471 if (GET_MODE_CLASS (mode) == MODE_INT
9472 && ! can_compare_p (LT, mode, ccp_jump))
9473 do_jump_by_parts_greater (exp, 1, if_false_label, if_true_label);
9475 do_compare_and_jump (exp, LT, LTU, if_false_label, if_true_label);
9479 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9480 if (GET_MODE_CLASS (mode) == MODE_INT
9481 && ! can_compare_p (LE, mode, ccp_jump))
9482 do_jump_by_parts_greater (exp, 0, if_true_label, if_false_label);
9484 do_compare_and_jump (exp, LE, LEU, if_false_label, if_true_label);
9488 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9489 if (GET_MODE_CLASS (mode) == MODE_INT
9490 && ! can_compare_p (GT, mode, ccp_jump))
9491 do_jump_by_parts_greater (exp, 0, if_false_label, if_true_label);
9493 do_compare_and_jump (exp, GT, GTU, if_false_label, if_true_label);
9497 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9498 if (GET_MODE_CLASS (mode) == MODE_INT
9499 && ! can_compare_p (GE, mode, ccp_jump))
9500 do_jump_by_parts_greater (exp, 1, if_true_label, if_false_label);
9502 do_compare_and_jump (exp, GE, GEU, if_false_label, if_true_label);
9505 case UNORDERED_EXPR:
9508 enum rtx_code cmp, rcmp;
9511 if (code == UNORDERED_EXPR)
9512 cmp = UNORDERED, rcmp = ORDERED;
9514 cmp = ORDERED, rcmp = UNORDERED;
9515 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9518 if (! can_compare_p (cmp, mode, ccp_jump)
9519 && (can_compare_p (rcmp, mode, ccp_jump)
9520 /* If the target doesn't provide either UNORDERED or ORDERED
9521 comparisons, canonicalize on UNORDERED for the library. */
9522 || rcmp == UNORDERED))
9526 do_compare_and_jump (exp, cmp, cmp, if_false_label, if_true_label);
9528 do_compare_and_jump (exp, rcmp, rcmp, if_true_label, if_false_label);
9533 enum rtx_code rcode1;
9534 enum tree_code tcode2;
9558 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9559 if (can_compare_p (rcode1, mode, ccp_jump))
9560 do_compare_and_jump (exp, rcode1, rcode1, if_false_label,
9564 tree op0 = save_expr (TREE_OPERAND (exp, 0));
9565 tree op1 = save_expr (TREE_OPERAND (exp, 1));
9568 /* If the target doesn't support combined unordered
9569 compares, decompose into UNORDERED + comparison. */
9570 cmp0 = fold (build (UNORDERED_EXPR, TREE_TYPE (exp), op0, op1));
9571 cmp1 = fold (build (tcode2, TREE_TYPE (exp), op0, op1));
9572 exp = build (TRUTH_ORIF_EXPR, TREE_TYPE (exp), cmp0, cmp1);
9573 do_jump (exp, if_false_label, if_true_label);
9580 temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);
9582 /* This is not needed any more and causes poor code since it causes
9583 comparisons and tests from non-SI objects to have different code
9585 /* Copy to register to avoid generating bad insns by cse
9586 from (set (mem ...) (arithop)) (set (cc0) (mem ...)). */
9587 if (!cse_not_expected && GET_CODE (temp) == MEM)
9588 temp = copy_to_reg (temp);
9590 do_pending_stack_adjust ();
9591 /* Do any postincrements in the expression that was tested. */
9594 if (GET_CODE (temp) == CONST_INT || GET_CODE (temp) == LABEL_REF)
9596 rtx target = temp == const0_rtx ? if_false_label : if_true_label;
9600 else if (GET_MODE_CLASS (GET_MODE (temp)) == MODE_INT
9601 && ! can_compare_p (NE, GET_MODE (temp), ccp_jump))
9602 /* Note swapping the labels gives us not-equal. */
9603 do_jump_by_parts_equality_rtx (temp, if_true_label, if_false_label);
9604 else if (GET_MODE (temp) != VOIDmode)
9605 do_compare_rtx_and_jump (temp, CONST0_RTX (GET_MODE (temp)),
9606 NE, TREE_UNSIGNED (TREE_TYPE (exp)),
9607 GET_MODE (temp), NULL_RTX, 0,
9608 if_false_label, if_true_label);
9613 if (drop_through_label)
9615 /* If do_jump produces code that might be jumped around,
9616 do any stack adjusts from that code, before the place
9617 where control merges in. */
9618 do_pending_stack_adjust ();
9619 emit_label (drop_through_label);
9623 /* Given a comparison expression EXP for values too wide to be compared
9624 with one insn, test the comparison and jump to the appropriate label.
9625 The code of EXP is ignored; we always test GT if SWAP is 0,
9626 and LT if SWAP is 1. */
9629 do_jump_by_parts_greater (exp, swap, if_false_label, if_true_label)
9632 rtx if_false_label, if_true_label;
9634 rtx op0 = expand_expr (TREE_OPERAND (exp, swap), NULL_RTX, VOIDmode, 0);
9635 rtx op1 = expand_expr (TREE_OPERAND (exp, !swap), NULL_RTX, VOIDmode, 0);
9636 enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9637 int unsignedp = TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0)));
9639 do_jump_by_parts_greater_rtx (mode, unsignedp, op0, op1, if_false_label, if_true_label);
9642 /* Compare OP0 with OP1, word at a time, in mode MODE.
9643 UNSIGNEDP says to do unsigned comparison.
9644 Jump to IF_TRUE_LABEL if OP0 is greater, IF_FALSE_LABEL otherwise. */
9647 do_jump_by_parts_greater_rtx (mode, unsignedp, op0, op1, if_false_label, if_true_label)
9648 enum machine_mode mode;
9651 rtx if_false_label, if_true_label;
9653 int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD);
9654 rtx drop_through_label = 0;
9657 if (! if_true_label || ! if_false_label)
9658 drop_through_label = gen_label_rtx ();
9659 if (! if_true_label)
9660 if_true_label = drop_through_label;
9661 if (! if_false_label)
9662 if_false_label = drop_through_label;
9664 /* Compare a word at a time, high order first. */
9665 for (i = 0; i < nwords; i++)
9667 rtx op0_word, op1_word;
9669 if (WORDS_BIG_ENDIAN)
9671 op0_word = operand_subword_force (op0, i, mode);
9672 op1_word = operand_subword_force (op1, i, mode);
9676 op0_word = operand_subword_force (op0, nwords - 1 - i, mode);
9677 op1_word = operand_subword_force (op1, nwords - 1 - i, mode);
9680 /* All but high-order word must be compared as unsigned. */
9681 do_compare_rtx_and_jump (op0_word, op1_word, GT,
9682 (unsignedp || i > 0), word_mode, NULL_RTX, 0,
9683 NULL_RTX, if_true_label);
9685 /* Consider lower words only if these are equal. */
9686 do_compare_rtx_and_jump (op0_word, op1_word, NE, unsignedp, word_mode,
9687 NULL_RTX, 0, NULL_RTX, if_false_label);
9691 emit_jump (if_false_label);
9692 if (drop_through_label)
9693 emit_label (drop_through_label);
9696 /* Given an EQ_EXPR expression EXP for values too wide to be compared
9697 with one insn, test the comparison and jump to the appropriate label. */
9700 do_jump_by_parts_equality (exp, if_false_label, if_true_label)
9702 rtx if_false_label, if_true_label;
9704 rtx op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
9705 rtx op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
9706 enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9707 int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD);
9709 rtx drop_through_label = 0;
9711 if (! if_false_label)
9712 drop_through_label = if_false_label = gen_label_rtx ();
9714 for (i = 0; i < nwords; i++)
9715 do_compare_rtx_and_jump (operand_subword_force (op0, i, mode),
9716 operand_subword_force (op1, i, mode),
9717 EQ, TREE_UNSIGNED (TREE_TYPE (exp)),
9718 word_mode, NULL_RTX, 0, if_false_label,
9722 emit_jump (if_true_label);
9723 if (drop_through_label)
9724 emit_label (drop_through_label);
9727 /* Jump according to whether OP0 is 0.
9728 We assume that OP0 has an integer mode that is too wide
9729 for the available compare insns. */
9732 do_jump_by_parts_equality_rtx (op0, if_false_label, if_true_label)
9734 rtx if_false_label, if_true_label;
9736 int nwords = GET_MODE_SIZE (GET_MODE (op0)) / UNITS_PER_WORD;
9739 rtx drop_through_label = 0;
9741 /* The fastest way of doing this comparison on almost any machine is to
9742 "or" all the words and compare the result. If all have to be loaded
9743 from memory and this is a very wide item, it's possible this may
9744 be slower, but that's highly unlikely. */
9746 part = gen_reg_rtx (word_mode);
9747 emit_move_insn (part, operand_subword_force (op0, 0, GET_MODE (op0)));
9748 for (i = 1; i < nwords && part != 0; i++)
9749 part = expand_binop (word_mode, ior_optab, part,
9750 operand_subword_force (op0, i, GET_MODE (op0)),
9751 part, 1, OPTAB_WIDEN);
9755 do_compare_rtx_and_jump (part, const0_rtx, EQ, 1, word_mode,
9756 NULL_RTX, 0, if_false_label, if_true_label);
9761 /* If we couldn't do the "or" simply, do this with a series of compares. */
9762 if (! if_false_label)
9763 drop_through_label = if_false_label = gen_label_rtx ();
9765 for (i = 0; i < nwords; i++)
9766 do_compare_rtx_and_jump (operand_subword_force (op0, i, GET_MODE (op0)),
9767 const0_rtx, EQ, 1, word_mode, NULL_RTX, 0,
9768 if_false_label, NULL_RTX);
9771 emit_jump (if_true_label);
9773 if (drop_through_label)
9774 emit_label (drop_through_label);
9777 /* Generate code for a comparison of OP0 and OP1 with rtx code CODE.
9778 (including code to compute the values to be compared)
9779 and set (CC0) according to the result.
9780 The decision as to signed or unsigned comparison must be made by the caller.
9782 We force a stack adjustment unless there are currently
9783 things pushed on the stack that aren't yet used.
9785 If MODE is BLKmode, SIZE is an RTX giving the size of the objects being
9788 If ALIGN is non-zero, it is the alignment of this type; if zero, the
9789 size of MODE should be used. */
9792 compare_from_rtx (op0, op1, code, unsignedp, mode, size, align)
9793 register rtx op0, op1;
9796 enum machine_mode mode;
9802 /* If one operand is constant, make it the second one. Only do this
9803 if the other operand is not constant as well. */
9805 if ((CONSTANT_P (op0) && ! CONSTANT_P (op1))
9806 || (GET_CODE (op0) == CONST_INT && GET_CODE (op1) != CONST_INT))
9811 code = swap_condition (code);
9816 op0 = force_not_mem (op0);
9817 op1 = force_not_mem (op1);
9820 do_pending_stack_adjust ();
9822 if (GET_CODE (op0) == CONST_INT && GET_CODE (op1) == CONST_INT
9823 && (tem = simplify_relational_operation (code, mode, op0, op1)) != 0)
9827 /* There's no need to do this now that combine.c can eliminate lots of
9828 sign extensions. This can be less efficient in certain cases on other
9831 /* If this is a signed equality comparison, we can do it as an
9832 unsigned comparison since zero-extension is cheaper than sign
9833 extension and comparisons with zero are done as unsigned. This is
9834 the case even on machines that can do fast sign extension, since
9835 zero-extension is easier to combine with other operations than
9836 sign-extension is. If we are comparing against a constant, we must
9837 convert it to what it would look like unsigned. */
9838 if ((code == EQ || code == NE) && ! unsignedp
9839 && GET_MODE_BITSIZE (GET_MODE (op0)) <= HOST_BITS_PER_WIDE_INT)
9841 if (GET_CODE (op1) == CONST_INT
9842 && (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0))) != INTVAL (op1))
9843 op1 = GEN_INT (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0)));
9848 emit_cmp_insn (op0, op1, code, size, mode, unsignedp, align);
9850 return gen_rtx_fmt_ee (code, VOIDmode, cc0_rtx, const0_rtx);
9853 /* Like do_compare_and_jump but expects the values to compare as two rtx's.
9854 The decision as to signed or unsigned comparison must be made by the caller.
9856 If MODE is BLKmode, SIZE is an RTX giving the size of the objects being
9859 If ALIGN is non-zero, it is the alignment of this type; if zero, the
9860 size of MODE should be used. */
9863 do_compare_rtx_and_jump (op0, op1, code, unsignedp, mode, size, align,
9864 if_false_label, if_true_label)
9865 register rtx op0, op1;
9868 enum machine_mode mode;
9871 rtx if_false_label, if_true_label;
9874 int dummy_true_label = 0;
9876 /* Reverse the comparison if that is safe and we want to jump if it is
9878 if (! if_true_label && ! FLOAT_MODE_P (mode))
9880 if_true_label = if_false_label;
9882 code = reverse_condition (code);
9885 /* If one operand is constant, make it the second one. Only do this
9886 if the other operand is not constant as well. */
9888 if ((CONSTANT_P (op0) && ! CONSTANT_P (op1))
9889 || (GET_CODE (op0) == CONST_INT && GET_CODE (op1) != CONST_INT))
9894 code = swap_condition (code);
9899 op0 = force_not_mem (op0);
9900 op1 = force_not_mem (op1);
9903 do_pending_stack_adjust ();
9905 if (GET_CODE (op0) == CONST_INT && GET_CODE (op1) == CONST_INT
9906 && (tem = simplify_relational_operation (code, mode, op0, op1)) != 0)
9908 if (tem == const_true_rtx)
9911 emit_jump (if_true_label);
9916 emit_jump (if_false_label);
9922 /* There's no need to do this now that combine.c can eliminate lots of
9923 sign extensions. This can be less efficient in certain cases on other
9926 /* If this is a signed equality comparison, we can do it as an
9927 unsigned comparison since zero-extension is cheaper than sign
9928 extension and comparisons with zero are done as unsigned. This is
9929 the case even on machines that can do fast sign extension, since
9930 zero-extension is easier to combine with other operations than
9931 sign-extension is. If we are comparing against a constant, we must
9932 convert it to what it would look like unsigned. */
9933 if ((code == EQ || code == NE) && ! unsignedp
9934 && GET_MODE_BITSIZE (GET_MODE (op0)) <= HOST_BITS_PER_WIDE_INT)
9936 if (GET_CODE (op1) == CONST_INT
9937 && (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0))) != INTVAL (op1))
9938 op1 = GEN_INT (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0)));
9943 if (! if_true_label)
9945 dummy_true_label = 1;
9946 if_true_label = gen_label_rtx ();
9949 emit_cmp_and_jump_insns (op0, op1, code, size, mode, unsignedp, align,
9953 emit_jump (if_false_label);
9954 if (dummy_true_label)
9955 emit_label (if_true_label);
9958 /* Generate code for a comparison expression EXP (including code to compute
9959 the values to be compared) and a conditional jump to IF_FALSE_LABEL and/or
9960 IF_TRUE_LABEL. One of the labels can be NULL_RTX, in which case the
9961 generated code will drop through.
9962 SIGNED_CODE should be the rtx operation for this comparison for
9963 signed data; UNSIGNED_CODE, likewise for use if data is unsigned.
9965 We force a stack adjustment unless there are currently
9966 things pushed on the stack that aren't yet used. */
9969 do_compare_and_jump (exp, signed_code, unsigned_code, if_false_label,
9972 enum rtx_code signed_code, unsigned_code;
9973 rtx if_false_label, if_true_label;
9975 unsigned int align0, align1;
9976 register rtx op0, op1;
9978 register enum machine_mode mode;
9982 /* Don't crash if the comparison was erroneous. */
9983 op0 = expand_expr_unaligned (TREE_OPERAND (exp, 0), &align0);
9984 if (TREE_CODE (TREE_OPERAND (exp, 0)) == ERROR_MARK)
9987 op1 = expand_expr_unaligned (TREE_OPERAND (exp, 1), &align1);
9988 type = TREE_TYPE (TREE_OPERAND (exp, 0));
9989 mode = TYPE_MODE (type);
9990 unsignedp = TREE_UNSIGNED (type);
9991 code = unsignedp ? unsigned_code : signed_code;
9993 #ifdef HAVE_canonicalize_funcptr_for_compare
9994 /* If function pointers need to be "canonicalized" before they can
9995 be reliably compared, then canonicalize them. */
9996 if (HAVE_canonicalize_funcptr_for_compare
9997 && TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == POINTER_TYPE
9998 && (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0))))
10001 rtx new_op0 = gen_reg_rtx (mode);
10003 emit_insn (gen_canonicalize_funcptr_for_compare (new_op0, op0));
10007 if (HAVE_canonicalize_funcptr_for_compare
10008 && TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 1))) == POINTER_TYPE
10009 && (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 1))))
10012 rtx new_op1 = gen_reg_rtx (mode);
10014 emit_insn (gen_canonicalize_funcptr_for_compare (new_op1, op1));
10019 /* Do any postincrements in the expression that was tested. */
10022 do_compare_rtx_and_jump (op0, op1, code, unsignedp, mode,
10024 ? expr_size (TREE_OPERAND (exp, 0)) : NULL_RTX),
10025 MIN (align0, align1) / BITS_PER_UNIT,
10026 if_false_label, if_true_label);
10029 /* Generate code to calculate EXP using a store-flag instruction
10030 and return an rtx for the result. EXP is either a comparison
10031 or a TRUTH_NOT_EXPR whose operand is a comparison.
10033 If TARGET is nonzero, store the result there if convenient.
10035 If ONLY_CHEAP is non-zero, only do this if it is likely to be very
10038 Return zero if there is no suitable set-flag instruction
10039 available on this machine.
10041 Once expand_expr has been called on the arguments of the comparison,
10042 we are committed to doing the store flag, since it is not safe to
10043 re-evaluate the expression. We emit the store-flag insn by calling
10044 emit_store_flag, but only expand the arguments if we have a reason
10045 to believe that emit_store_flag will be successful. If we think that
10046 it will, but it isn't, we have to simulate the store-flag with a
10047 set/jump/set sequence. */
10050 do_store_flag (exp, target, mode, only_cheap)
10053 enum machine_mode mode;
10056 enum rtx_code code;
10057 tree arg0, arg1, type;
10059 enum machine_mode operand_mode;
10063 enum insn_code icode;
10064 rtx subtarget = target;
10067 /* If this is a TRUTH_NOT_EXPR, set a flag indicating we must invert the
10068 result at the end. We can't simply invert the test since it would
10069 have already been inverted if it were valid. This case occurs for
10070 some floating-point comparisons. */
10072 if (TREE_CODE (exp) == TRUTH_NOT_EXPR)
10073 invert = 1, exp = TREE_OPERAND (exp, 0);
10075 arg0 = TREE_OPERAND (exp, 0);
10076 arg1 = TREE_OPERAND (exp, 1);
10077 type = TREE_TYPE (arg0);
10078 operand_mode = TYPE_MODE (type);
10079 unsignedp = TREE_UNSIGNED (type);
10081 /* We won't bother with BLKmode store-flag operations because it would mean
10082 passing a lot of information to emit_store_flag. */
10083 if (operand_mode == BLKmode)
10086 /* We won't bother with store-flag operations involving function pointers
10087 when function pointers must be canonicalized before comparisons. */
10088 #ifdef HAVE_canonicalize_funcptr_for_compare
10089 if (HAVE_canonicalize_funcptr_for_compare
10090 && ((TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == POINTER_TYPE
10091 && (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0))))
10093 || (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 1))) == POINTER_TYPE
10094 && (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 1))))
10095 == FUNCTION_TYPE))))
10102 /* Get the rtx comparison code to use. We know that EXP is a comparison
10103 operation of some type. Some comparisons against 1 and -1 can be
10104 converted to comparisons with zero. Do so here so that the tests
10105 below will be aware that we have a comparison with zero. These
10106 tests will not catch constants in the first operand, but constants
10107 are rarely passed as the first operand. */
10109 switch (TREE_CODE (exp))
10118 if (integer_onep (arg1))
10119 arg1 = integer_zero_node, code = unsignedp ? LEU : LE;
10121 code = unsignedp ? LTU : LT;
10124 if (! unsignedp && integer_all_onesp (arg1))
10125 arg1 = integer_zero_node, code = LT;
10127 code = unsignedp ? LEU : LE;
10130 if (! unsignedp && integer_all_onesp (arg1))
10131 arg1 = integer_zero_node, code = GE;
10133 code = unsignedp ? GTU : GT;
10136 if (integer_onep (arg1))
10137 arg1 = integer_zero_node, code = unsignedp ? GTU : GT;
10139 code = unsignedp ? GEU : GE;
10142 case UNORDERED_EXPR:
10168 /* Put a constant second. */
10169 if (TREE_CODE (arg0) == REAL_CST || TREE_CODE (arg0) == INTEGER_CST)
10171 tem = arg0; arg0 = arg1; arg1 = tem;
10172 code = swap_condition (code);
10175 /* If this is an equality or inequality test of a single bit, we can
10176 do this by shifting the bit being tested to the low-order bit and
10177 masking the result with the constant 1. If the condition was EQ,
10178 we xor it with 1. This does not require an scc insn and is faster
10179 than an scc insn even if we have it. */
10181 if ((code == NE || code == EQ)
10182 && TREE_CODE (arg0) == BIT_AND_EXPR && integer_zerop (arg1)
10183 && integer_pow2p (TREE_OPERAND (arg0, 1)))
10185 tree inner = TREE_OPERAND (arg0, 0);
10186 int bitnum = tree_log2 (TREE_OPERAND (arg0, 1));
10189 /* If INNER is a right shift of a constant and it plus BITNUM does
10190 not overflow, adjust BITNUM and INNER. */
10192 if (TREE_CODE (inner) == RSHIFT_EXPR
10193 && TREE_CODE (TREE_OPERAND (inner, 1)) == INTEGER_CST
10194 && TREE_INT_CST_HIGH (TREE_OPERAND (inner, 1)) == 0
10195 && (bitnum + TREE_INT_CST_LOW (TREE_OPERAND (inner, 1))
10196 < TYPE_PRECISION (type)))
10198 bitnum += TREE_INT_CST_LOW (TREE_OPERAND (inner, 1));
10199 inner = TREE_OPERAND (inner, 0);
10202 /* If we are going to be able to omit the AND below, we must do our
10203 operations as unsigned. If we must use the AND, we have a choice.
10204 Normally unsigned is faster, but for some machines signed is. */
10205 ops_unsignedp = (bitnum == TYPE_PRECISION (type) - 1 ? 1
10206 #ifdef LOAD_EXTEND_OP
10207 : (LOAD_EXTEND_OP (operand_mode) == SIGN_EXTEND ? 0 : 1)
10213 if (subtarget == 0 || GET_CODE (subtarget) != REG
10214 || GET_MODE (subtarget) != operand_mode
10215 || ! safe_from_p (subtarget, inner, 1))
10218 op0 = expand_expr (inner, subtarget, VOIDmode, 0);
10221 op0 = expand_shift (RSHIFT_EXPR, GET_MODE (op0), op0,
10222 size_int (bitnum), subtarget, ops_unsignedp);
10224 if (GET_MODE (op0) != mode)
10225 op0 = convert_to_mode (mode, op0, ops_unsignedp);
10227 if ((code == EQ && ! invert) || (code == NE && invert))
10228 op0 = expand_binop (mode, xor_optab, op0, const1_rtx, subtarget,
10229 ops_unsignedp, OPTAB_LIB_WIDEN);
10231 /* Put the AND last so it can combine with more things. */
10232 if (bitnum != TYPE_PRECISION (type) - 1)
10233 op0 = expand_and (op0, const1_rtx, subtarget);
10238 /* Now see if we are likely to be able to do this. Return if not. */
10239 if (! can_compare_p (code, operand_mode, ccp_store_flag))
10242 icode = setcc_gen_code[(int) code];
10243 if (icode == CODE_FOR_nothing
10244 || (only_cheap && insn_data[(int) icode].operand[0].mode != mode))
10246 /* We can only do this if it is one of the special cases that
10247 can be handled without an scc insn. */
10248 if ((code == LT && integer_zerop (arg1))
10249 || (! only_cheap && code == GE && integer_zerop (arg1)))
10251 else if (BRANCH_COST >= 0
10252 && ! only_cheap && (code == NE || code == EQ)
10253 && TREE_CODE (type) != REAL_TYPE
10254 && ((abs_optab->handlers[(int) operand_mode].insn_code
10255 != CODE_FOR_nothing)
10256 || (ffs_optab->handlers[(int) operand_mode].insn_code
10257 != CODE_FOR_nothing)))
10263 preexpand_calls (exp);
10264 if (subtarget == 0 || GET_CODE (subtarget) != REG
10265 || GET_MODE (subtarget) != operand_mode
10266 || ! safe_from_p (subtarget, arg1, 1))
10269 op0 = expand_expr (arg0, subtarget, VOIDmode, 0);
10270 op1 = expand_expr (arg1, NULL_RTX, VOIDmode, 0);
10273 target = gen_reg_rtx (mode);
10275 /* Pass copies of OP0 and OP1 in case they contain a QUEUED. This is safe
10276 because, if the emit_store_flag does anything it will succeed and
10277 OP0 and OP1 will not be used subsequently. */
10279 result = emit_store_flag (target, code,
10280 queued_subexp_p (op0) ? copy_rtx (op0) : op0,
10281 queued_subexp_p (op1) ? copy_rtx (op1) : op1,
10282 operand_mode, unsignedp, 1);
10287 result = expand_binop (mode, xor_optab, result, const1_rtx,
10288 result, 0, OPTAB_LIB_WIDEN);
10292 /* If this failed, we have to do this with set/compare/jump/set code. */
10293 if (GET_CODE (target) != REG
10294 || reg_mentioned_p (target, op0) || reg_mentioned_p (target, op1))
10295 target = gen_reg_rtx (GET_MODE (target));
10297 emit_move_insn (target, invert ? const0_rtx : const1_rtx);
10298 result = compare_from_rtx (op0, op1, code, unsignedp,
10299 operand_mode, NULL_RTX, 0);
10300 if (GET_CODE (result) == CONST_INT)
10301 return (((result == const0_rtx && ! invert)
10302 || (result != const0_rtx && invert))
10303 ? const0_rtx : const1_rtx);
10305 label = gen_label_rtx ();
10306 if (bcc_gen_fctn[(int) code] == 0)
10309 emit_jump_insn ((*bcc_gen_fctn[(int) code]) (label));
10310 emit_move_insn (target, invert ? const1_rtx : const0_rtx);
10311 emit_label (label);
10316 /* Generate a tablejump instruction (used for switch statements). */
10318 #ifdef HAVE_tablejump
10320 /* INDEX is the value being switched on, with the lowest value
10321 in the table already subtracted.
10322 MODE is its expected mode (needed if INDEX is constant).
10323 RANGE is the length of the jump table.
10324 TABLE_LABEL is a CODE_LABEL rtx for the table itself.
10326 DEFAULT_LABEL is a CODE_LABEL rtx to jump to if the
10327 index value is out of range. */
10330 do_tablejump (index, mode, range, table_label, default_label)
10331 rtx index, range, table_label, default_label;
10332 enum machine_mode mode;
10334 register rtx temp, vector;
10336 /* Do an unsigned comparison (in the proper mode) between the index
10337 expression and the value which represents the length of the range.
10338 Since we just finished subtracting the lower bound of the range
10339 from the index expression, this comparison allows us to simultaneously
10340 check that the original index expression value is both greater than
10341 or equal to the minimum value of the range and less than or equal to
10342 the maximum value of the range. */
10344 emit_cmp_and_jump_insns (index, range, GTU, NULL_RTX, mode, 1,
10347 /* If index is in range, it must fit in Pmode.
10348 Convert to Pmode so we can index with it. */
10350 index = convert_to_mode (Pmode, index, 1);
10352 /* Don't let a MEM slip thru, because then INDEX that comes
10353 out of PIC_CASE_VECTOR_ADDRESS won't be a valid address,
10354 and break_out_memory_refs will go to work on it and mess it up. */
10355 #ifdef PIC_CASE_VECTOR_ADDRESS
10356 if (flag_pic && GET_CODE (index) != REG)
10357 index = copy_to_mode_reg (Pmode, index);
10360 /* If flag_force_addr were to affect this address
10361 it could interfere with the tricky assumptions made
10362 about addresses that contain label-refs,
10363 which may be valid only very near the tablejump itself. */
10364 /* ??? The only correct use of CASE_VECTOR_MODE is the one inside the
10365 GET_MODE_SIZE, because this indicates how large insns are. The other
10366 uses should all be Pmode, because they are addresses. This code
10367 could fail if addresses and insns are not the same size. */
10368 index = gen_rtx_PLUS (Pmode,
10369 gen_rtx_MULT (Pmode, index,
10370 GEN_INT (GET_MODE_SIZE (CASE_VECTOR_MODE))),
10371 gen_rtx_LABEL_REF (Pmode, table_label));
10372 #ifdef PIC_CASE_VECTOR_ADDRESS
10374 index = PIC_CASE_VECTOR_ADDRESS (index);
10377 index = memory_address_noforce (CASE_VECTOR_MODE, index);
10378 temp = gen_reg_rtx (CASE_VECTOR_MODE);
10379 vector = gen_rtx_MEM (CASE_VECTOR_MODE, index);
10380 RTX_UNCHANGING_P (vector) = 1;
10381 convert_move (temp, vector, 0);
10383 emit_jump_insn (gen_tablejump (temp, table_label));
10385 /* If we are generating PIC code or if the table is PC-relative, the
10386 table and JUMP_INSN must be adjacent, so don't output a BARRIER. */
10387 if (! CASE_VECTOR_PC_RELATIVE && ! flag_pic)
10391 #endif /* HAVE_tablejump */