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. */
30 #include "hard-reg-set.h"
33 #include "insn-flags.h"
34 #include "insn-codes.h"
35 #include "insn-config.h"
36 /* Include expr.h after insn-config.h so we get HAVE_conditional_move. */
41 #include "typeclass.h"
48 #ifndef ACCUMULATE_OUTGOING_ARGS
49 #define ACCUMULATE_OUTGOING_ARGS 0
52 /* Supply a default definition for PUSH_ARGS. */
55 #define PUSH_ARGS !ACCUMULATE_OUTGOING_ARGS
61 /* Decide whether a function's arguments should be processed
62 from first to last or from last to first.
64 They should if the stack and args grow in opposite directions, but
65 only if we have push insns. */
69 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
70 #define PUSH_ARGS_REVERSED /* If it's last to first. */
75 #ifndef STACK_PUSH_CODE
76 #ifdef STACK_GROWS_DOWNWARD
77 #define STACK_PUSH_CODE PRE_DEC
79 #define STACK_PUSH_CODE PRE_INC
83 /* Assume that case vectors are not pc-relative. */
84 #ifndef CASE_VECTOR_PC_RELATIVE
85 #define CASE_VECTOR_PC_RELATIVE 0
88 /* If this is nonzero, we do not bother generating VOLATILE
89 around volatile memory references, and we are willing to
90 output indirect addresses. If cse is to follow, we reject
91 indirect addresses so a useful potential cse is generated;
92 if it is used only once, instruction combination will produce
93 the same indirect address eventually. */
96 /* Nonzero to generate code for all the subroutines within an
97 expression before generating the upper levels of the expression.
98 Nowadays this is never zero. */
99 int do_preexpand_calls = 1;
101 /* Don't check memory usage, since code is being emitted to check a memory
102 usage. Used when current_function_check_memory_usage is true, to avoid
103 infinite recursion. */
104 static int in_check_memory_usage;
106 /* Chain of pending expressions for PLACEHOLDER_EXPR to replace. */
107 static tree placeholder_list = 0;
109 /* This structure is used by move_by_pieces to describe the move to
111 struct move_by_pieces
120 int explicit_inc_from;
121 unsigned HOST_WIDE_INT len;
122 HOST_WIDE_INT offset;
126 /* This structure is used by clear_by_pieces to describe the clear to
129 struct clear_by_pieces
135 unsigned HOST_WIDE_INT len;
136 HOST_WIDE_INT offset;
140 extern struct obstack permanent_obstack;
142 static rtx get_push_address PARAMS ((int));
144 static rtx enqueue_insn PARAMS ((rtx, rtx));
145 static unsigned HOST_WIDE_INT move_by_pieces_ninsns
146 PARAMS ((unsigned HOST_WIDE_INT,
148 static void move_by_pieces_1 PARAMS ((rtx (*) (rtx, ...), enum machine_mode,
149 struct move_by_pieces *));
150 static void clear_by_pieces PARAMS ((rtx, unsigned HOST_WIDE_INT,
152 static void clear_by_pieces_1 PARAMS ((rtx (*) (rtx, ...),
154 struct clear_by_pieces *));
155 static rtx get_subtarget PARAMS ((rtx));
156 static int is_zeros_p PARAMS ((tree));
157 static int mostly_zeros_p PARAMS ((tree));
158 static void store_constructor_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
159 HOST_WIDE_INT, enum machine_mode,
160 tree, tree, unsigned int, int));
161 static void store_constructor PARAMS ((tree, rtx, unsigned int, int,
163 static rtx store_field PARAMS ((rtx, HOST_WIDE_INT,
164 HOST_WIDE_INT, enum machine_mode,
165 tree, enum machine_mode, int,
166 unsigned int, HOST_WIDE_INT, int));
167 static enum memory_use_mode
168 get_memory_usage_from_modifier PARAMS ((enum expand_modifier));
169 static tree save_noncopied_parts PARAMS ((tree, tree));
170 static tree init_noncopied_parts PARAMS ((tree, tree));
171 static int safe_from_p PARAMS ((rtx, tree, int));
172 static int fixed_type_p PARAMS ((tree));
173 static rtx var_rtx PARAMS ((tree));
174 static int readonly_fields_p PARAMS ((tree));
175 static rtx expand_expr_unaligned PARAMS ((tree, unsigned int *));
176 static rtx expand_increment PARAMS ((tree, int, int));
177 static void preexpand_calls PARAMS ((tree));
178 static void do_jump_by_parts_greater PARAMS ((tree, int, rtx, rtx));
179 static void do_jump_by_parts_equality PARAMS ((tree, rtx, rtx));
180 static void do_compare_and_jump PARAMS ((tree, enum rtx_code, enum rtx_code,
182 static rtx do_store_flag PARAMS ((tree, rtx, enum machine_mode, int));
184 /* Record for each mode whether we can move a register directly to or
185 from an object of that mode in memory. If we can't, we won't try
186 to use that mode directly when accessing a field of that mode. */
188 static char direct_load[NUM_MACHINE_MODES];
189 static char direct_store[NUM_MACHINE_MODES];
191 /* If a memory-to-memory move would take MOVE_RATIO or more simple
192 move-instruction sequences, we will do a movstr or libcall instead. */
195 #if defined (HAVE_movstrqi) || defined (HAVE_movstrhi) || defined (HAVE_movstrsi) || defined (HAVE_movstrdi) || defined (HAVE_movstrti)
198 /* If we are optimizing for space (-Os), cut down the default move ratio. */
199 #define MOVE_RATIO (optimize_size ? 3 : 15)
203 /* This macro is used to determine whether move_by_pieces should be called
204 to perform a structure copy. */
205 #ifndef MOVE_BY_PIECES_P
206 #define MOVE_BY_PIECES_P(SIZE, ALIGN) \
207 (move_by_pieces_ninsns (SIZE, ALIGN) < MOVE_RATIO)
210 /* This array records the insn_code of insns to perform block moves. */
211 enum insn_code movstr_optab[NUM_MACHINE_MODES];
213 /* This array records the insn_code of insns to perform block clears. */
214 enum insn_code clrstr_optab[NUM_MACHINE_MODES];
216 /* SLOW_UNALIGNED_ACCESS is non-zero if unaligned accesses are very slow. */
218 #ifndef SLOW_UNALIGNED_ACCESS
219 #define SLOW_UNALIGNED_ACCESS(MODE, ALIGN) STRICT_ALIGNMENT
222 /* This is run once per compilation to set up which modes can be used
223 directly in memory and to initialize the block move optab. */
229 enum machine_mode mode;
236 /* Since we are on the permanent obstack, we must be sure we save this
237 spot AFTER we call start_sequence, since it will reuse the rtl it
239 free_point = (char *) oballoc (0);
241 /* Try indexing by frame ptr and try by stack ptr.
242 It is known that on the Convex the stack ptr isn't a valid index.
243 With luck, one or the other is valid on any machine. */
244 mem = gen_rtx_MEM (VOIDmode, stack_pointer_rtx);
245 mem1 = gen_rtx_MEM (VOIDmode, frame_pointer_rtx);
247 insn = emit_insn (gen_rtx_SET (0, NULL_RTX, NULL_RTX));
248 pat = PATTERN (insn);
250 for (mode = VOIDmode; (int) mode < NUM_MACHINE_MODES;
251 mode = (enum machine_mode) ((int) mode + 1))
256 direct_load[(int) mode] = direct_store[(int) mode] = 0;
257 PUT_MODE (mem, mode);
258 PUT_MODE (mem1, mode);
260 /* See if there is some register that can be used in this mode and
261 directly loaded or stored from memory. */
263 if (mode != VOIDmode && mode != BLKmode)
264 for (regno = 0; regno < FIRST_PSEUDO_REGISTER
265 && (direct_load[(int) mode] == 0 || direct_store[(int) mode] == 0);
268 if (! HARD_REGNO_MODE_OK (regno, mode))
271 reg = gen_rtx_REG (mode, regno);
274 SET_DEST (pat) = reg;
275 if (recog (pat, insn, &num_clobbers) >= 0)
276 direct_load[(int) mode] = 1;
278 SET_SRC (pat) = mem1;
279 SET_DEST (pat) = reg;
280 if (recog (pat, insn, &num_clobbers) >= 0)
281 direct_load[(int) mode] = 1;
284 SET_DEST (pat) = mem;
285 if (recog (pat, insn, &num_clobbers) >= 0)
286 direct_store[(int) mode] = 1;
289 SET_DEST (pat) = mem1;
290 if (recog (pat, insn, &num_clobbers) >= 0)
291 direct_store[(int) mode] = 1;
299 /* This is run at the start of compiling a function. */
304 cfun->expr = (struct expr_status *) xmalloc (sizeof (struct expr_status));
307 pending_stack_adjust = 0;
308 stack_pointer_delta = 0;
309 inhibit_defer_pop = 0;
311 apply_args_value = 0;
317 struct expr_status *p;
322 ggc_mark_rtx (p->x_saveregs_value);
323 ggc_mark_rtx (p->x_apply_args_value);
324 ggc_mark_rtx (p->x_forced_labels);
335 /* Small sanity check that the queue is empty at the end of a function. */
338 finish_expr_for_function ()
344 /* Manage the queue of increment instructions to be output
345 for POSTINCREMENT_EXPR expressions, etc. */
347 /* Queue up to increment (or change) VAR later. BODY says how:
348 BODY should be the same thing you would pass to emit_insn
349 to increment right away. It will go to emit_insn later on.
351 The value is a QUEUED expression to be used in place of VAR
352 where you want to guarantee the pre-incrementation value of VAR. */
355 enqueue_insn (var, body)
358 pending_chain = gen_rtx_QUEUED (GET_MODE (var), var, NULL_RTX, NULL_RTX,
359 body, pending_chain);
360 return pending_chain;
363 /* Use protect_from_queue to convert a QUEUED expression
364 into something that you can put immediately into an instruction.
365 If the queued incrementation has not happened yet,
366 protect_from_queue returns the variable itself.
367 If the incrementation has happened, protect_from_queue returns a temp
368 that contains a copy of the old value of the variable.
370 Any time an rtx which might possibly be a QUEUED is to be put
371 into an instruction, it must be passed through protect_from_queue first.
372 QUEUED expressions are not meaningful in instructions.
374 Do not pass a value through protect_from_queue and then hold
375 on to it for a while before putting it in an instruction!
376 If the queue is flushed in between, incorrect code will result. */
379 protect_from_queue (x, modify)
383 register RTX_CODE code = GET_CODE (x);
385 #if 0 /* A QUEUED can hang around after the queue is forced out. */
386 /* Shortcut for most common case. */
387 if (pending_chain == 0)
393 /* A special hack for read access to (MEM (QUEUED ...)) to facilitate
394 use of autoincrement. Make a copy of the contents of the memory
395 location rather than a copy of the address, but not if the value is
396 of mode BLKmode. Don't modify X in place since it might be
398 if (code == MEM && GET_MODE (x) != BLKmode
399 && GET_CODE (XEXP (x, 0)) == QUEUED && !modify)
401 register rtx y = XEXP (x, 0);
402 register rtx new = gen_rtx_MEM (GET_MODE (x), QUEUED_VAR (y));
404 MEM_COPY_ATTRIBUTES (new, x);
408 register rtx temp = gen_reg_rtx (GET_MODE (new));
409 emit_insn_before (gen_move_insn (temp, new),
415 /* Otherwise, recursively protect the subexpressions of all
416 the kinds of rtx's that can contain a QUEUED. */
419 rtx tem = protect_from_queue (XEXP (x, 0), 0);
420 if (tem != XEXP (x, 0))
426 else if (code == PLUS || code == MULT)
428 rtx new0 = protect_from_queue (XEXP (x, 0), 0);
429 rtx new1 = protect_from_queue (XEXP (x, 1), 0);
430 if (new0 != XEXP (x, 0) || new1 != XEXP (x, 1))
439 /* If the increment has not happened, use the variable itself. */
440 if (QUEUED_INSN (x) == 0)
441 return QUEUED_VAR (x);
442 /* If the increment has happened and a pre-increment copy exists,
444 if (QUEUED_COPY (x) != 0)
445 return QUEUED_COPY (x);
446 /* The increment has happened but we haven't set up a pre-increment copy.
447 Set one up now, and use it. */
448 QUEUED_COPY (x) = gen_reg_rtx (GET_MODE (QUEUED_VAR (x)));
449 emit_insn_before (gen_move_insn (QUEUED_COPY (x), QUEUED_VAR (x)),
451 return QUEUED_COPY (x);
454 /* Return nonzero if X contains a QUEUED expression:
455 if it contains anything that will be altered by a queued increment.
456 We handle only combinations of MEM, PLUS, MINUS and MULT operators
457 since memory addresses generally contain only those. */
463 register enum rtx_code code = GET_CODE (x);
469 return queued_subexp_p (XEXP (x, 0));
473 return (queued_subexp_p (XEXP (x, 0))
474 || queued_subexp_p (XEXP (x, 1)));
480 /* Perform all the pending incrementations. */
486 while ((p = pending_chain))
488 rtx body = QUEUED_BODY (p);
490 if (GET_CODE (body) == SEQUENCE)
492 QUEUED_INSN (p) = XVECEXP (QUEUED_BODY (p), 0, 0);
493 emit_insn (QUEUED_BODY (p));
496 QUEUED_INSN (p) = emit_insn (QUEUED_BODY (p));
497 pending_chain = QUEUED_NEXT (p);
501 /* Copy data from FROM to TO, where the machine modes are not the same.
502 Both modes may be integer, or both may be floating.
503 UNSIGNEDP should be nonzero if FROM is an unsigned type.
504 This causes zero-extension instead of sign-extension. */
507 convert_move (to, from, unsignedp)
508 register rtx to, from;
511 enum machine_mode to_mode = GET_MODE (to);
512 enum machine_mode from_mode = GET_MODE (from);
513 int to_real = GET_MODE_CLASS (to_mode) == MODE_FLOAT;
514 int from_real = GET_MODE_CLASS (from_mode) == MODE_FLOAT;
518 /* rtx code for making an equivalent value. */
519 enum rtx_code equiv_code = (unsignedp ? ZERO_EXTEND : SIGN_EXTEND);
521 to = protect_from_queue (to, 1);
522 from = protect_from_queue (from, 0);
524 if (to_real != from_real)
527 /* If FROM is a SUBREG that indicates that we have already done at least
528 the required extension, strip it. We don't handle such SUBREGs as
531 if (GET_CODE (from) == SUBREG && SUBREG_PROMOTED_VAR_P (from)
532 && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (from)))
533 >= GET_MODE_SIZE (to_mode))
534 && SUBREG_PROMOTED_UNSIGNED_P (from) == unsignedp)
535 from = gen_lowpart (to_mode, from), from_mode = to_mode;
537 if (GET_CODE (to) == SUBREG && SUBREG_PROMOTED_VAR_P (to))
540 if (to_mode == from_mode
541 || (from_mode == VOIDmode && CONSTANT_P (from)))
543 emit_move_insn (to, from);
547 if (VECTOR_MODE_P (to_mode) || VECTOR_MODE_P (from_mode))
549 if (GET_MODE_BITSIZE (from_mode) != GET_MODE_BITSIZE (to_mode))
552 if (VECTOR_MODE_P (to_mode))
553 from = gen_rtx_SUBREG (to_mode, from, 0);
555 to = gen_rtx_SUBREG (from_mode, to, 0);
557 emit_move_insn (to, from);
561 if (to_real != from_real)
568 if (GET_MODE_BITSIZE (from_mode) < GET_MODE_BITSIZE (to_mode))
570 /* Try converting directly if the insn is supported. */
571 if ((code = can_extend_p (to_mode, from_mode, 0))
574 emit_unop_insn (code, to, from, UNKNOWN);
579 #ifdef HAVE_trunchfqf2
580 if (HAVE_trunchfqf2 && from_mode == HFmode && to_mode == QFmode)
582 emit_unop_insn (CODE_FOR_trunchfqf2, to, from, UNKNOWN);
586 #ifdef HAVE_trunctqfqf2
587 if (HAVE_trunctqfqf2 && from_mode == TQFmode && to_mode == QFmode)
589 emit_unop_insn (CODE_FOR_trunctqfqf2, to, from, UNKNOWN);
593 #ifdef HAVE_truncsfqf2
594 if (HAVE_truncsfqf2 && from_mode == SFmode && to_mode == QFmode)
596 emit_unop_insn (CODE_FOR_truncsfqf2, to, from, UNKNOWN);
600 #ifdef HAVE_truncdfqf2
601 if (HAVE_truncdfqf2 && from_mode == DFmode && to_mode == QFmode)
603 emit_unop_insn (CODE_FOR_truncdfqf2, to, from, UNKNOWN);
607 #ifdef HAVE_truncxfqf2
608 if (HAVE_truncxfqf2 && from_mode == XFmode && to_mode == QFmode)
610 emit_unop_insn (CODE_FOR_truncxfqf2, to, from, UNKNOWN);
614 #ifdef HAVE_trunctfqf2
615 if (HAVE_trunctfqf2 && from_mode == TFmode && to_mode == QFmode)
617 emit_unop_insn (CODE_FOR_trunctfqf2, to, from, UNKNOWN);
622 #ifdef HAVE_trunctqfhf2
623 if (HAVE_trunctqfhf2 && from_mode == TQFmode && to_mode == HFmode)
625 emit_unop_insn (CODE_FOR_trunctqfhf2, to, from, UNKNOWN);
629 #ifdef HAVE_truncsfhf2
630 if (HAVE_truncsfhf2 && from_mode == SFmode && to_mode == HFmode)
632 emit_unop_insn (CODE_FOR_truncsfhf2, to, from, UNKNOWN);
636 #ifdef HAVE_truncdfhf2
637 if (HAVE_truncdfhf2 && from_mode == DFmode && to_mode == HFmode)
639 emit_unop_insn (CODE_FOR_truncdfhf2, to, from, UNKNOWN);
643 #ifdef HAVE_truncxfhf2
644 if (HAVE_truncxfhf2 && from_mode == XFmode && to_mode == HFmode)
646 emit_unop_insn (CODE_FOR_truncxfhf2, to, from, UNKNOWN);
650 #ifdef HAVE_trunctfhf2
651 if (HAVE_trunctfhf2 && from_mode == TFmode && to_mode == HFmode)
653 emit_unop_insn (CODE_FOR_trunctfhf2, to, from, UNKNOWN);
658 #ifdef HAVE_truncsftqf2
659 if (HAVE_truncsftqf2 && from_mode == SFmode && to_mode == TQFmode)
661 emit_unop_insn (CODE_FOR_truncsftqf2, to, from, UNKNOWN);
665 #ifdef HAVE_truncdftqf2
666 if (HAVE_truncdftqf2 && from_mode == DFmode && to_mode == TQFmode)
668 emit_unop_insn (CODE_FOR_truncdftqf2, to, from, UNKNOWN);
672 #ifdef HAVE_truncxftqf2
673 if (HAVE_truncxftqf2 && from_mode == XFmode && to_mode == TQFmode)
675 emit_unop_insn (CODE_FOR_truncxftqf2, to, from, UNKNOWN);
679 #ifdef HAVE_trunctftqf2
680 if (HAVE_trunctftqf2 && from_mode == TFmode && to_mode == TQFmode)
682 emit_unop_insn (CODE_FOR_trunctftqf2, to, from, UNKNOWN);
687 #ifdef HAVE_truncdfsf2
688 if (HAVE_truncdfsf2 && from_mode == DFmode && to_mode == SFmode)
690 emit_unop_insn (CODE_FOR_truncdfsf2, to, from, UNKNOWN);
694 #ifdef HAVE_truncxfsf2
695 if (HAVE_truncxfsf2 && from_mode == XFmode && to_mode == SFmode)
697 emit_unop_insn (CODE_FOR_truncxfsf2, to, from, UNKNOWN);
701 #ifdef HAVE_trunctfsf2
702 if (HAVE_trunctfsf2 && from_mode == TFmode && to_mode == SFmode)
704 emit_unop_insn (CODE_FOR_trunctfsf2, to, from, UNKNOWN);
708 #ifdef HAVE_truncxfdf2
709 if (HAVE_truncxfdf2 && from_mode == XFmode && to_mode == DFmode)
711 emit_unop_insn (CODE_FOR_truncxfdf2, to, from, UNKNOWN);
715 #ifdef HAVE_trunctfdf2
716 if (HAVE_trunctfdf2 && from_mode == TFmode && to_mode == DFmode)
718 emit_unop_insn (CODE_FOR_trunctfdf2, to, from, UNKNOWN);
730 libcall = extendsfdf2_libfunc;
734 libcall = extendsfxf2_libfunc;
738 libcall = extendsftf2_libfunc;
750 libcall = truncdfsf2_libfunc;
754 libcall = extenddfxf2_libfunc;
758 libcall = extenddftf2_libfunc;
770 libcall = truncxfsf2_libfunc;
774 libcall = truncxfdf2_libfunc;
786 libcall = trunctfsf2_libfunc;
790 libcall = trunctfdf2_libfunc;
802 if (libcall == (rtx) 0)
803 /* This conversion is not implemented yet. */
806 value = emit_library_call_value (libcall, NULL_RTX, 1, to_mode,
808 emit_move_insn (to, value);
812 /* Now both modes are integers. */
814 /* Handle expanding beyond a word. */
815 if (GET_MODE_BITSIZE (from_mode) < GET_MODE_BITSIZE (to_mode)
816 && GET_MODE_BITSIZE (to_mode) > BITS_PER_WORD)
823 enum machine_mode lowpart_mode;
824 int nwords = CEIL (GET_MODE_SIZE (to_mode), UNITS_PER_WORD);
826 /* Try converting directly if the insn is supported. */
827 if ((code = can_extend_p (to_mode, from_mode, unsignedp))
830 /* If FROM is a SUBREG, put it into a register. Do this
831 so that we always generate the same set of insns for
832 better cse'ing; if an intermediate assignment occurred,
833 we won't be doing the operation directly on the SUBREG. */
834 if (optimize > 0 && GET_CODE (from) == SUBREG)
835 from = force_reg (from_mode, from);
836 emit_unop_insn (code, to, from, equiv_code);
839 /* Next, try converting via full word. */
840 else if (GET_MODE_BITSIZE (from_mode) < BITS_PER_WORD
841 && ((code = can_extend_p (to_mode, word_mode, unsignedp))
842 != CODE_FOR_nothing))
844 if (GET_CODE (to) == REG)
845 emit_insn (gen_rtx_CLOBBER (VOIDmode, to));
846 convert_move (gen_lowpart (word_mode, to), from, unsignedp);
847 emit_unop_insn (code, to,
848 gen_lowpart (word_mode, to), equiv_code);
852 /* No special multiword conversion insn; do it by hand. */
855 /* Since we will turn this into a no conflict block, we must ensure
856 that the source does not overlap the target. */
858 if (reg_overlap_mentioned_p (to, from))
859 from = force_reg (from_mode, from);
861 /* Get a copy of FROM widened to a word, if necessary. */
862 if (GET_MODE_BITSIZE (from_mode) < BITS_PER_WORD)
863 lowpart_mode = word_mode;
865 lowpart_mode = from_mode;
867 lowfrom = convert_to_mode (lowpart_mode, from, unsignedp);
869 lowpart = gen_lowpart (lowpart_mode, to);
870 emit_move_insn (lowpart, lowfrom);
872 /* Compute the value to put in each remaining word. */
874 fill_value = const0_rtx;
879 && insn_data[(int) CODE_FOR_slt].operand[0].mode == word_mode
880 && STORE_FLAG_VALUE == -1)
882 emit_cmp_insn (lowfrom, const0_rtx, NE, NULL_RTX,
884 fill_value = gen_reg_rtx (word_mode);
885 emit_insn (gen_slt (fill_value));
891 = expand_shift (RSHIFT_EXPR, lowpart_mode, lowfrom,
892 size_int (GET_MODE_BITSIZE (lowpart_mode) - 1),
894 fill_value = convert_to_mode (word_mode, fill_value, 1);
898 /* Fill the remaining words. */
899 for (i = GET_MODE_SIZE (lowpart_mode) / UNITS_PER_WORD; i < nwords; i++)
901 int index = (WORDS_BIG_ENDIAN ? nwords - i - 1 : i);
902 rtx subword = operand_subword (to, index, 1, to_mode);
907 if (fill_value != subword)
908 emit_move_insn (subword, fill_value);
911 insns = get_insns ();
914 emit_no_conflict_block (insns, to, from, NULL_RTX,
915 gen_rtx_fmt_e (equiv_code, to_mode, copy_rtx (from)));
919 /* Truncating multi-word to a word or less. */
920 if (GET_MODE_BITSIZE (from_mode) > BITS_PER_WORD
921 && GET_MODE_BITSIZE (to_mode) <= BITS_PER_WORD)
923 if (!((GET_CODE (from) == MEM
924 && ! MEM_VOLATILE_P (from)
925 && direct_load[(int) to_mode]
926 && ! mode_dependent_address_p (XEXP (from, 0)))
927 || GET_CODE (from) == REG
928 || GET_CODE (from) == SUBREG))
929 from = force_reg (from_mode, from);
930 convert_move (to, gen_lowpart (word_mode, from), 0);
934 /* Handle pointer conversion. */ /* SPEE 900220. */
935 if (to_mode == PQImode)
937 if (from_mode != QImode)
938 from = convert_to_mode (QImode, from, unsignedp);
940 #ifdef HAVE_truncqipqi2
941 if (HAVE_truncqipqi2)
943 emit_unop_insn (CODE_FOR_truncqipqi2, to, from, UNKNOWN);
946 #endif /* HAVE_truncqipqi2 */
950 if (from_mode == PQImode)
952 if (to_mode != QImode)
954 from = convert_to_mode (QImode, from, unsignedp);
959 #ifdef HAVE_extendpqiqi2
960 if (HAVE_extendpqiqi2)
962 emit_unop_insn (CODE_FOR_extendpqiqi2, to, from, UNKNOWN);
965 #endif /* HAVE_extendpqiqi2 */
970 if (to_mode == PSImode)
972 if (from_mode != SImode)
973 from = convert_to_mode (SImode, from, unsignedp);
975 #ifdef HAVE_truncsipsi2
976 if (HAVE_truncsipsi2)
978 emit_unop_insn (CODE_FOR_truncsipsi2, to, from, UNKNOWN);
981 #endif /* HAVE_truncsipsi2 */
985 if (from_mode == PSImode)
987 if (to_mode != SImode)
989 from = convert_to_mode (SImode, from, unsignedp);
994 #ifdef HAVE_extendpsisi2
995 if (HAVE_extendpsisi2)
997 emit_unop_insn (CODE_FOR_extendpsisi2, to, from, UNKNOWN);
1000 #endif /* HAVE_extendpsisi2 */
1005 if (to_mode == PDImode)
1007 if (from_mode != DImode)
1008 from = convert_to_mode (DImode, from, unsignedp);
1010 #ifdef HAVE_truncdipdi2
1011 if (HAVE_truncdipdi2)
1013 emit_unop_insn (CODE_FOR_truncdipdi2, to, from, UNKNOWN);
1016 #endif /* HAVE_truncdipdi2 */
1020 if (from_mode == PDImode)
1022 if (to_mode != DImode)
1024 from = convert_to_mode (DImode, from, unsignedp);
1029 #ifdef HAVE_extendpdidi2
1030 if (HAVE_extendpdidi2)
1032 emit_unop_insn (CODE_FOR_extendpdidi2, to, from, UNKNOWN);
1035 #endif /* HAVE_extendpdidi2 */
1040 /* Now follow all the conversions between integers
1041 no more than a word long. */
1043 /* For truncation, usually we can just refer to FROM in a narrower mode. */
1044 if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode)
1045 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (to_mode),
1046 GET_MODE_BITSIZE (from_mode)))
1048 if (!((GET_CODE (from) == MEM
1049 && ! MEM_VOLATILE_P (from)
1050 && direct_load[(int) to_mode]
1051 && ! mode_dependent_address_p (XEXP (from, 0)))
1052 || GET_CODE (from) == REG
1053 || GET_CODE (from) == SUBREG))
1054 from = force_reg (from_mode, from);
1055 if (GET_CODE (from) == REG && REGNO (from) < FIRST_PSEUDO_REGISTER
1056 && ! HARD_REGNO_MODE_OK (REGNO (from), to_mode))
1057 from = copy_to_reg (from);
1058 emit_move_insn (to, gen_lowpart (to_mode, from));
1062 /* Handle extension. */
1063 if (GET_MODE_BITSIZE (to_mode) > GET_MODE_BITSIZE (from_mode))
1065 /* Convert directly if that works. */
1066 if ((code = can_extend_p (to_mode, from_mode, unsignedp))
1067 != CODE_FOR_nothing)
1069 emit_unop_insn (code, to, from, equiv_code);
1074 enum machine_mode intermediate;
1078 /* Search for a mode to convert via. */
1079 for (intermediate = from_mode; intermediate != VOIDmode;
1080 intermediate = GET_MODE_WIDER_MODE (intermediate))
1081 if (((can_extend_p (to_mode, intermediate, unsignedp)
1082 != CODE_FOR_nothing)
1083 || (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (intermediate)
1084 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (to_mode),
1085 GET_MODE_BITSIZE (intermediate))))
1086 && (can_extend_p (intermediate, from_mode, unsignedp)
1087 != CODE_FOR_nothing))
1089 convert_move (to, convert_to_mode (intermediate, from,
1090 unsignedp), unsignedp);
1094 /* No suitable intermediate mode.
1095 Generate what we need with shifts. */
1096 shift_amount = build_int_2 (GET_MODE_BITSIZE (to_mode)
1097 - GET_MODE_BITSIZE (from_mode), 0);
1098 from = gen_lowpart (to_mode, force_reg (from_mode, from));
1099 tmp = expand_shift (LSHIFT_EXPR, to_mode, from, shift_amount,
1101 tmp = expand_shift (RSHIFT_EXPR, to_mode, tmp, shift_amount,
1104 emit_move_insn (to, tmp);
1109 /* Support special truncate insns for certain modes. */
1111 if (from_mode == DImode && to_mode == SImode)
1113 #ifdef HAVE_truncdisi2
1114 if (HAVE_truncdisi2)
1116 emit_unop_insn (CODE_FOR_truncdisi2, to, from, UNKNOWN);
1120 convert_move (to, force_reg (from_mode, from), unsignedp);
1124 if (from_mode == DImode && to_mode == HImode)
1126 #ifdef HAVE_truncdihi2
1127 if (HAVE_truncdihi2)
1129 emit_unop_insn (CODE_FOR_truncdihi2, to, from, UNKNOWN);
1133 convert_move (to, force_reg (from_mode, from), unsignedp);
1137 if (from_mode == DImode && to_mode == QImode)
1139 #ifdef HAVE_truncdiqi2
1140 if (HAVE_truncdiqi2)
1142 emit_unop_insn (CODE_FOR_truncdiqi2, to, from, UNKNOWN);
1146 convert_move (to, force_reg (from_mode, from), unsignedp);
1150 if (from_mode == SImode && to_mode == HImode)
1152 #ifdef HAVE_truncsihi2
1153 if (HAVE_truncsihi2)
1155 emit_unop_insn (CODE_FOR_truncsihi2, to, from, UNKNOWN);
1159 convert_move (to, force_reg (from_mode, from), unsignedp);
1163 if (from_mode == SImode && to_mode == QImode)
1165 #ifdef HAVE_truncsiqi2
1166 if (HAVE_truncsiqi2)
1168 emit_unop_insn (CODE_FOR_truncsiqi2, to, from, UNKNOWN);
1172 convert_move (to, force_reg (from_mode, from), unsignedp);
1176 if (from_mode == HImode && to_mode == QImode)
1178 #ifdef HAVE_trunchiqi2
1179 if (HAVE_trunchiqi2)
1181 emit_unop_insn (CODE_FOR_trunchiqi2, to, from, UNKNOWN);
1185 convert_move (to, force_reg (from_mode, from), unsignedp);
1189 if (from_mode == TImode && to_mode == DImode)
1191 #ifdef HAVE_trunctidi2
1192 if (HAVE_trunctidi2)
1194 emit_unop_insn (CODE_FOR_trunctidi2, to, from, UNKNOWN);
1198 convert_move (to, force_reg (from_mode, from), unsignedp);
1202 if (from_mode == TImode && to_mode == SImode)
1204 #ifdef HAVE_trunctisi2
1205 if (HAVE_trunctisi2)
1207 emit_unop_insn (CODE_FOR_trunctisi2, to, from, UNKNOWN);
1211 convert_move (to, force_reg (from_mode, from), unsignedp);
1215 if (from_mode == TImode && to_mode == HImode)
1217 #ifdef HAVE_trunctihi2
1218 if (HAVE_trunctihi2)
1220 emit_unop_insn (CODE_FOR_trunctihi2, to, from, UNKNOWN);
1224 convert_move (to, force_reg (from_mode, from), unsignedp);
1228 if (from_mode == TImode && to_mode == QImode)
1230 #ifdef HAVE_trunctiqi2
1231 if (HAVE_trunctiqi2)
1233 emit_unop_insn (CODE_FOR_trunctiqi2, to, from, UNKNOWN);
1237 convert_move (to, force_reg (from_mode, from), unsignedp);
1241 /* Handle truncation of volatile memrefs, and so on;
1242 the things that couldn't be truncated directly,
1243 and for which there was no special instruction. */
1244 if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode))
1246 rtx temp = force_reg (to_mode, gen_lowpart (to_mode, from));
1247 emit_move_insn (to, temp);
1251 /* Mode combination is not recognized. */
1255 /* Return an rtx for a value that would result
1256 from converting X to mode MODE.
1257 Both X and MODE may be floating, or both integer.
1258 UNSIGNEDP is nonzero if X is an unsigned value.
1259 This can be done by referring to a part of X in place
1260 or by copying to a new temporary with conversion.
1262 This function *must not* call protect_from_queue
1263 except when putting X into an insn (in which case convert_move does it). */
1266 convert_to_mode (mode, x, unsignedp)
1267 enum machine_mode mode;
1271 return convert_modes (mode, VOIDmode, x, unsignedp);
1274 /* Return an rtx for a value that would result
1275 from converting X from mode OLDMODE to mode MODE.
1276 Both modes may be floating, or both integer.
1277 UNSIGNEDP is nonzero if X is an unsigned value.
1279 This can be done by referring to a part of X in place
1280 or by copying to a new temporary with conversion.
1282 You can give VOIDmode for OLDMODE, if you are sure X has a nonvoid mode.
1284 This function *must not* call protect_from_queue
1285 except when putting X into an insn (in which case convert_move does it). */
1288 convert_modes (mode, oldmode, x, unsignedp)
1289 enum machine_mode mode, oldmode;
1295 /* If FROM is a SUBREG that indicates that we have already done at least
1296 the required extension, strip it. */
1298 if (GET_CODE (x) == SUBREG && SUBREG_PROMOTED_VAR_P (x)
1299 && GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) >= GET_MODE_SIZE (mode)
1300 && SUBREG_PROMOTED_UNSIGNED_P (x) == unsignedp)
1301 x = gen_lowpart (mode, x);
1303 if (GET_MODE (x) != VOIDmode)
1304 oldmode = GET_MODE (x);
1306 if (mode == oldmode)
1309 /* There is one case that we must handle specially: If we are converting
1310 a CONST_INT into a mode whose size is twice HOST_BITS_PER_WIDE_INT and
1311 we are to interpret the constant as unsigned, gen_lowpart will do
1312 the wrong if the constant appears negative. What we want to do is
1313 make the high-order word of the constant zero, not all ones. */
1315 if (unsignedp && GET_MODE_CLASS (mode) == MODE_INT
1316 && GET_MODE_BITSIZE (mode) == 2 * HOST_BITS_PER_WIDE_INT
1317 && GET_CODE (x) == CONST_INT && INTVAL (x) < 0)
1319 HOST_WIDE_INT val = INTVAL (x);
1321 if (oldmode != VOIDmode
1322 && HOST_BITS_PER_WIDE_INT > GET_MODE_BITSIZE (oldmode))
1324 int width = GET_MODE_BITSIZE (oldmode);
1326 /* We need to zero extend VAL. */
1327 val &= ((HOST_WIDE_INT) 1 << width) - 1;
1330 return immed_double_const (val, (HOST_WIDE_INT) 0, mode);
1333 /* We can do this with a gen_lowpart if both desired and current modes
1334 are integer, and this is either a constant integer, a register, or a
1335 non-volatile MEM. Except for the constant case where MODE is no
1336 wider than HOST_BITS_PER_WIDE_INT, we must be narrowing the operand. */
1338 if ((GET_CODE (x) == CONST_INT
1339 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
1340 || (GET_MODE_CLASS (mode) == MODE_INT
1341 && GET_MODE_CLASS (oldmode) == MODE_INT
1342 && (GET_CODE (x) == CONST_DOUBLE
1343 || (GET_MODE_SIZE (mode) <= GET_MODE_SIZE (oldmode)
1344 && ((GET_CODE (x) == MEM && ! MEM_VOLATILE_P (x)
1345 && direct_load[(int) mode])
1346 || (GET_CODE (x) == REG
1347 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
1348 GET_MODE_BITSIZE (GET_MODE (x)))))))))
1350 /* ?? If we don't know OLDMODE, we have to assume here that
1351 X does not need sign- or zero-extension. This may not be
1352 the case, but it's the best we can do. */
1353 if (GET_CODE (x) == CONST_INT && oldmode != VOIDmode
1354 && GET_MODE_SIZE (mode) > GET_MODE_SIZE (oldmode))
1356 HOST_WIDE_INT val = INTVAL (x);
1357 int width = GET_MODE_BITSIZE (oldmode);
1359 /* We must sign or zero-extend in this case. Start by
1360 zero-extending, then sign extend if we need to. */
1361 val &= ((HOST_WIDE_INT) 1 << width) - 1;
1363 && (val & ((HOST_WIDE_INT) 1 << (width - 1))))
1364 val |= (HOST_WIDE_INT) (-1) << width;
1366 return GEN_INT (val);
1369 return gen_lowpart (mode, x);
1372 temp = gen_reg_rtx (mode);
1373 convert_move (temp, x, unsignedp);
1377 /* This macro is used to determine what the largest unit size that
1378 move_by_pieces can use is. */
1380 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
1381 move efficiently, as opposed to MOVE_MAX which is the maximum
1382 number of bytes we can move with a single instruction. */
1384 #ifndef MOVE_MAX_PIECES
1385 #define MOVE_MAX_PIECES MOVE_MAX
1388 /* Generate several move instructions to copy LEN bytes
1389 from block FROM to block TO. (These are MEM rtx's with BLKmode).
1390 The caller must pass FROM and TO
1391 through protect_from_queue before calling.
1392 ALIGN is maximum alignment we can assume. */
1395 move_by_pieces (to, from, len, align)
1397 unsigned HOST_WIDE_INT len;
1400 struct move_by_pieces data;
1401 rtx to_addr = XEXP (to, 0), from_addr = XEXP (from, 0);
1402 unsigned int max_size = MOVE_MAX_PIECES + 1;
1403 enum machine_mode mode = VOIDmode, tmode;
1404 enum insn_code icode;
1407 data.to_addr = to_addr;
1408 data.from_addr = from_addr;
1412 = (GET_CODE (to_addr) == PRE_INC || GET_CODE (to_addr) == PRE_DEC
1413 || GET_CODE (to_addr) == POST_INC || GET_CODE (to_addr) == POST_DEC);
1415 = (GET_CODE (from_addr) == PRE_INC || GET_CODE (from_addr) == PRE_DEC
1416 || GET_CODE (from_addr) == POST_INC
1417 || GET_CODE (from_addr) == POST_DEC);
1419 data.explicit_inc_from = 0;
1420 data.explicit_inc_to = 0;
1422 = (GET_CODE (to_addr) == PRE_DEC || GET_CODE (to_addr) == POST_DEC);
1423 if (data.reverse) data.offset = len;
1426 /* If copying requires more than two move insns,
1427 copy addresses to registers (to make displacements shorter)
1428 and use post-increment if available. */
1429 if (!(data.autinc_from && data.autinc_to)
1430 && move_by_pieces_ninsns (len, align) > 2)
1432 /* Find the mode of the largest move... */
1433 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1434 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
1435 if (GET_MODE_SIZE (tmode) < max_size)
1438 if (USE_LOAD_PRE_DECREMENT (mode) && data.reverse && ! data.autinc_from)
1440 data.from_addr = copy_addr_to_reg (plus_constant (from_addr, len));
1441 data.autinc_from = 1;
1442 data.explicit_inc_from = -1;
1444 if (USE_LOAD_POST_INCREMENT (mode) && ! data.autinc_from)
1446 data.from_addr = copy_addr_to_reg (from_addr);
1447 data.autinc_from = 1;
1448 data.explicit_inc_from = 1;
1450 if (!data.autinc_from && CONSTANT_P (from_addr))
1451 data.from_addr = copy_addr_to_reg (from_addr);
1452 if (USE_STORE_PRE_DECREMENT (mode) && data.reverse && ! data.autinc_to)
1454 data.to_addr = copy_addr_to_reg (plus_constant (to_addr, len));
1456 data.explicit_inc_to = -1;
1458 if (USE_STORE_POST_INCREMENT (mode) && ! data.reverse && ! data.autinc_to)
1460 data.to_addr = copy_addr_to_reg (to_addr);
1462 data.explicit_inc_to = 1;
1464 if (!data.autinc_to && CONSTANT_P (to_addr))
1465 data.to_addr = copy_addr_to_reg (to_addr);
1468 if (! SLOW_UNALIGNED_ACCESS (word_mode, align)
1469 || align > MOVE_MAX * BITS_PER_UNIT || align >= BIGGEST_ALIGNMENT)
1470 align = MOVE_MAX * BITS_PER_UNIT;
1472 /* First move what we can in the largest integer mode, then go to
1473 successively smaller modes. */
1475 while (max_size > 1)
1477 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1478 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
1479 if (GET_MODE_SIZE (tmode) < max_size)
1482 if (mode == VOIDmode)
1485 icode = mov_optab->handlers[(int) mode].insn_code;
1486 if (icode != CODE_FOR_nothing && align >= GET_MODE_ALIGNMENT (mode))
1487 move_by_pieces_1 (GEN_FCN (icode), mode, &data);
1489 max_size = GET_MODE_SIZE (mode);
1492 /* The code above should have handled everything. */
1497 /* Return number of insns required to move L bytes by pieces.
1498 ALIGN (in bytes) is maximum alignment we can assume. */
1500 static unsigned HOST_WIDE_INT
1501 move_by_pieces_ninsns (l, align)
1502 unsigned HOST_WIDE_INT l;
1505 unsigned HOST_WIDE_INT n_insns = 0;
1506 unsigned HOST_WIDE_INT max_size = MOVE_MAX + 1;
1508 if (! SLOW_UNALIGNED_ACCESS (word_mode, align)
1509 || align > MOVE_MAX * BITS_PER_UNIT || align >= BIGGEST_ALIGNMENT)
1510 align = MOVE_MAX * BITS_PER_UNIT;
1512 while (max_size > 1)
1514 enum machine_mode mode = VOIDmode, tmode;
1515 enum insn_code icode;
1517 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1518 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
1519 if (GET_MODE_SIZE (tmode) < max_size)
1522 if (mode == VOIDmode)
1525 icode = mov_optab->handlers[(int) mode].insn_code;
1526 if (icode != CODE_FOR_nothing && align >= GET_MODE_ALIGNMENT (mode))
1527 n_insns += l / GET_MODE_SIZE (mode), l %= GET_MODE_SIZE (mode);
1529 max_size = GET_MODE_SIZE (mode);
1535 /* Subroutine of move_by_pieces. Move as many bytes as appropriate
1536 with move instructions for mode MODE. GENFUN is the gen_... function
1537 to make a move insn for that mode. DATA has all the other info. */
1540 move_by_pieces_1 (genfun, mode, data)
1541 rtx (*genfun) PARAMS ((rtx, ...));
1542 enum machine_mode mode;
1543 struct move_by_pieces *data;
1545 unsigned int size = GET_MODE_SIZE (mode);
1548 while (data->len >= size)
1551 data->offset -= size;
1553 if (data->autinc_to)
1555 to1 = gen_rtx_MEM (mode, data->to_addr);
1556 MEM_COPY_ATTRIBUTES (to1, data->to);
1559 to1 = change_address (data->to, mode,
1560 plus_constant (data->to_addr, data->offset));
1562 if (data->autinc_from)
1564 from1 = gen_rtx_MEM (mode, data->from_addr);
1565 MEM_COPY_ATTRIBUTES (from1, data->from);
1568 from1 = change_address (data->from, mode,
1569 plus_constant (data->from_addr, data->offset));
1571 if (HAVE_PRE_DECREMENT && data->explicit_inc_to < 0)
1572 emit_insn (gen_add2_insn (data->to_addr, GEN_INT (-size)));
1573 if (HAVE_PRE_DECREMENT && data->explicit_inc_from < 0)
1574 emit_insn (gen_add2_insn (data->from_addr, GEN_INT (-size)));
1576 emit_insn ((*genfun) (to1, from1));
1578 if (HAVE_POST_INCREMENT && data->explicit_inc_to > 0)
1579 emit_insn (gen_add2_insn (data->to_addr, GEN_INT (size)));
1580 if (HAVE_POST_INCREMENT && data->explicit_inc_from > 0)
1581 emit_insn (gen_add2_insn (data->from_addr, GEN_INT (size)));
1583 if (! data->reverse)
1584 data->offset += size;
1590 /* Emit code to move a block Y to a block X.
1591 This may be done with string-move instructions,
1592 with multiple scalar move instructions, or with a library call.
1594 Both X and Y must be MEM rtx's (perhaps inside VOLATILE)
1596 SIZE is an rtx that says how long they are.
1597 ALIGN is the maximum alignment we can assume they have.
1599 Return the address of the new block, if memcpy is called and returns it,
1603 emit_block_move (x, y, size, align)
1609 #ifdef TARGET_MEM_FUNCTIONS
1611 tree call_expr, arg_list;
1614 if (GET_MODE (x) != BLKmode)
1617 if (GET_MODE (y) != BLKmode)
1620 x = protect_from_queue (x, 1);
1621 y = protect_from_queue (y, 0);
1622 size = protect_from_queue (size, 0);
1624 if (GET_CODE (x) != MEM)
1626 if (GET_CODE (y) != MEM)
1631 if (GET_CODE (size) == CONST_INT && MOVE_BY_PIECES_P (INTVAL (size), align))
1632 move_by_pieces (x, y, INTVAL (size), align);
1635 /* Try the most limited insn first, because there's no point
1636 including more than one in the machine description unless
1637 the more limited one has some advantage. */
1639 rtx opalign = GEN_INT (align / BITS_PER_UNIT);
1640 enum machine_mode mode;
1642 /* Since this is a move insn, we don't care about volatility. */
1645 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
1646 mode = GET_MODE_WIDER_MODE (mode))
1648 enum insn_code code = movstr_optab[(int) mode];
1649 insn_operand_predicate_fn pred;
1651 if (code != CODE_FOR_nothing
1652 /* We don't need MODE to be narrower than BITS_PER_HOST_WIDE_INT
1653 here because if SIZE is less than the mode mask, as it is
1654 returned by the macro, it will definitely be less than the
1655 actual mode mask. */
1656 && ((GET_CODE (size) == CONST_INT
1657 && ((unsigned HOST_WIDE_INT) INTVAL (size)
1658 <= (GET_MODE_MASK (mode) >> 1)))
1659 || GET_MODE_BITSIZE (mode) >= BITS_PER_WORD)
1660 && ((pred = insn_data[(int) code].operand[0].predicate) == 0
1661 || (*pred) (x, BLKmode))
1662 && ((pred = insn_data[(int) code].operand[1].predicate) == 0
1663 || (*pred) (y, BLKmode))
1664 && ((pred = insn_data[(int) code].operand[3].predicate) == 0
1665 || (*pred) (opalign, VOIDmode)))
1668 rtx last = get_last_insn ();
1671 op2 = convert_to_mode (mode, size, 1);
1672 pred = insn_data[(int) code].operand[2].predicate;
1673 if (pred != 0 && ! (*pred) (op2, mode))
1674 op2 = copy_to_mode_reg (mode, op2);
1676 pat = GEN_FCN ((int) code) (x, y, op2, opalign);
1684 delete_insns_since (last);
1690 /* X, Y, or SIZE may have been passed through protect_from_queue.
1692 It is unsafe to save the value generated by protect_from_queue
1693 and reuse it later. Consider what happens if emit_queue is
1694 called before the return value from protect_from_queue is used.
1696 Expansion of the CALL_EXPR below will call emit_queue before
1697 we are finished emitting RTL for argument setup. So if we are
1698 not careful we could get the wrong value for an argument.
1700 To avoid this problem we go ahead and emit code to copy X, Y &
1701 SIZE into new pseudos. We can then place those new pseudos
1702 into an RTL_EXPR and use them later, even after a call to
1705 Note this is not strictly needed for library calls since they
1706 do not call emit_queue before loading their arguments. However,
1707 we may need to have library calls call emit_queue in the future
1708 since failing to do so could cause problems for targets which
1709 define SMALL_REGISTER_CLASSES and pass arguments in registers. */
1710 x = copy_to_mode_reg (Pmode, XEXP (x, 0));
1711 y = copy_to_mode_reg (Pmode, XEXP (y, 0));
1713 #ifdef TARGET_MEM_FUNCTIONS
1714 size = copy_to_mode_reg (TYPE_MODE (sizetype), size);
1716 size = convert_to_mode (TYPE_MODE (integer_type_node), size,
1717 TREE_UNSIGNED (integer_type_node));
1718 size = copy_to_mode_reg (TYPE_MODE (integer_type_node), size);
1721 #ifdef TARGET_MEM_FUNCTIONS
1722 /* It is incorrect to use the libcall calling conventions to call
1723 memcpy in this context.
1725 This could be a user call to memcpy and the user may wish to
1726 examine the return value from memcpy.
1728 For targets where libcalls and normal calls have different conventions
1729 for returning pointers, we could end up generating incorrect code.
1731 So instead of using a libcall sequence we build up a suitable
1732 CALL_EXPR and expand the call in the normal fashion. */
1733 if (fn == NULL_TREE)
1737 /* This was copied from except.c, I don't know if all this is
1738 necessary in this context or not. */
1739 fn = get_identifier ("memcpy");
1740 push_obstacks_nochange ();
1741 end_temporary_allocation ();
1742 fntype = build_pointer_type (void_type_node);
1743 fntype = build_function_type (fntype, NULL_TREE);
1744 fn = build_decl (FUNCTION_DECL, fn, fntype);
1745 ggc_add_tree_root (&fn, 1);
1746 DECL_EXTERNAL (fn) = 1;
1747 TREE_PUBLIC (fn) = 1;
1748 DECL_ARTIFICIAL (fn) = 1;
1749 make_decl_rtl (fn, NULL_PTR, 1);
1750 assemble_external (fn);
1754 /* We need to make an argument list for the function call.
1756 memcpy has three arguments, the first two are void * addresses and
1757 the last is a size_t byte count for the copy. */
1759 = build_tree_list (NULL_TREE,
1760 make_tree (build_pointer_type (void_type_node), x));
1761 TREE_CHAIN (arg_list)
1762 = build_tree_list (NULL_TREE,
1763 make_tree (build_pointer_type (void_type_node), y));
1764 TREE_CHAIN (TREE_CHAIN (arg_list))
1765 = build_tree_list (NULL_TREE, make_tree (sizetype, size));
1766 TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (arg_list))) = NULL_TREE;
1768 /* Now we have to build up the CALL_EXPR itself. */
1769 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
1770 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
1771 call_expr, arg_list, NULL_TREE);
1772 TREE_SIDE_EFFECTS (call_expr) = 1;
1774 retval = expand_expr (call_expr, NULL_RTX, VOIDmode, 0);
1776 emit_library_call (bcopy_libfunc, 0,
1777 VOIDmode, 3, y, Pmode, x, Pmode,
1778 convert_to_mode (TYPE_MODE (integer_type_node), size,
1779 TREE_UNSIGNED (integer_type_node)),
1780 TYPE_MODE (integer_type_node));
1787 /* Copy all or part of a value X into registers starting at REGNO.
1788 The number of registers to be filled is NREGS. */
1791 move_block_to_reg (regno, x, nregs, mode)
1795 enum machine_mode mode;
1798 #ifdef HAVE_load_multiple
1806 if (CONSTANT_P (x) && ! LEGITIMATE_CONSTANT_P (x))
1807 x = validize_mem (force_const_mem (mode, x));
1809 /* See if the machine can do this with a load multiple insn. */
1810 #ifdef HAVE_load_multiple
1811 if (HAVE_load_multiple)
1813 last = get_last_insn ();
1814 pat = gen_load_multiple (gen_rtx_REG (word_mode, regno), x,
1822 delete_insns_since (last);
1826 for (i = 0; i < nregs; i++)
1827 emit_move_insn (gen_rtx_REG (word_mode, regno + i),
1828 operand_subword_force (x, i, mode));
1831 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
1832 The number of registers to be filled is NREGS. SIZE indicates the number
1833 of bytes in the object X. */
1836 move_block_from_reg (regno, x, nregs, size)
1843 #ifdef HAVE_store_multiple
1847 enum machine_mode mode;
1849 /* If SIZE is that of a mode no bigger than a word, just use that
1850 mode's store operation. */
1851 if (size <= UNITS_PER_WORD
1852 && (mode = mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0)) != BLKmode)
1854 emit_move_insn (change_address (x, mode, NULL),
1855 gen_rtx_REG (mode, regno));
1859 /* Blocks smaller than a word on a BYTES_BIG_ENDIAN machine must be aligned
1860 to the left before storing to memory. Note that the previous test
1861 doesn't handle all cases (e.g. SIZE == 3). */
1862 if (size < UNITS_PER_WORD && BYTES_BIG_ENDIAN)
1864 rtx tem = operand_subword (x, 0, 1, BLKmode);
1870 shift = expand_shift (LSHIFT_EXPR, word_mode,
1871 gen_rtx_REG (word_mode, regno),
1872 build_int_2 ((UNITS_PER_WORD - size)
1873 * BITS_PER_UNIT, 0), NULL_RTX, 0);
1874 emit_move_insn (tem, shift);
1878 /* See if the machine can do this with a store multiple insn. */
1879 #ifdef HAVE_store_multiple
1880 if (HAVE_store_multiple)
1882 last = get_last_insn ();
1883 pat = gen_store_multiple (x, gen_rtx_REG (word_mode, regno),
1891 delete_insns_since (last);
1895 for (i = 0; i < nregs; i++)
1897 rtx tem = operand_subword (x, i, 1, BLKmode);
1902 emit_move_insn (tem, gen_rtx_REG (word_mode, regno + i));
1906 /* Emit code to move a block SRC to a block DST, where DST is non-consecutive
1907 registers represented by a PARALLEL. SSIZE represents the total size of
1908 block SRC in bytes, or -1 if not known. ALIGN is the known alignment of
1910 /* ??? If SSIZE % UNITS_PER_WORD != 0, we make the blatent assumption that
1911 the balance will be in what would be the low-order memory addresses, i.e.
1912 left justified for big endian, right justified for little endian. This
1913 happens to be true for the targets currently using this support. If this
1914 ever changes, a new target macro along the lines of FUNCTION_ARG_PADDING
1918 emit_group_load (dst, orig_src, ssize, align)
1926 if (GET_CODE (dst) != PARALLEL)
1929 /* Check for a NULL entry, used to indicate that the parameter goes
1930 both on the stack and in registers. */
1931 if (XEXP (XVECEXP (dst, 0, 0), 0))
1936 tmps = (rtx *) alloca (sizeof (rtx) * XVECLEN (dst, 0));
1938 /* If we won't be loading directly from memory, protect the real source
1939 from strange tricks we might play. */
1941 if (GET_CODE (src) != MEM)
1943 if (GET_MODE (src) == VOIDmode)
1944 src = gen_reg_rtx (GET_MODE (dst));
1946 src = gen_reg_rtx (GET_MODE (orig_src));
1947 emit_move_insn (src, orig_src);
1950 /* Process the pieces. */
1951 for (i = start; i < XVECLEN (dst, 0); i++)
1953 enum machine_mode mode = GET_MODE (XEXP (XVECEXP (dst, 0, i), 0));
1954 HOST_WIDE_INT bytepos = INTVAL (XEXP (XVECEXP (dst, 0, i), 1));
1955 unsigned int bytelen = GET_MODE_SIZE (mode);
1958 /* Handle trailing fragments that run over the size of the struct. */
1959 if (ssize >= 0 && bytepos + bytelen > ssize)
1961 shift = (bytelen - (ssize - bytepos)) * BITS_PER_UNIT;
1962 bytelen = ssize - bytepos;
1967 /* Optimize the access just a bit. */
1968 if (GET_CODE (src) == MEM
1969 && align >= GET_MODE_ALIGNMENT (mode)
1970 && bytepos * BITS_PER_UNIT % GET_MODE_ALIGNMENT (mode) == 0
1971 && bytelen == GET_MODE_SIZE (mode))
1973 tmps[i] = gen_reg_rtx (mode);
1974 emit_move_insn (tmps[i],
1975 change_address (src, mode,
1976 plus_constant (XEXP (src, 0),
1979 else if (GET_CODE (src) == CONCAT)
1982 && bytelen == GET_MODE_SIZE (GET_MODE (XEXP (src, 0))))
1983 tmps[i] = XEXP (src, 0);
1984 else if (bytepos == GET_MODE_SIZE (GET_MODE (XEXP (src, 0)))
1985 && bytelen == GET_MODE_SIZE (GET_MODE (XEXP (src, 1))))
1986 tmps[i] = XEXP (src, 1);
1991 tmps[i] = extract_bit_field (src, bytelen * BITS_PER_UNIT,
1992 bytepos * BITS_PER_UNIT, 1, NULL_RTX,
1993 mode, mode, align, ssize);
1995 if (BYTES_BIG_ENDIAN && shift)
1996 expand_binop (mode, ashl_optab, tmps[i], GEN_INT (shift),
1997 tmps[i], 0, OPTAB_WIDEN);
2002 /* Copy the extracted pieces into the proper (probable) hard regs. */
2003 for (i = start; i < XVECLEN (dst, 0); i++)
2004 emit_move_insn (XEXP (XVECEXP (dst, 0, i), 0), tmps[i]);
2007 /* Emit code to move a block SRC to a block DST, where SRC is non-consecutive
2008 registers represented by a PARALLEL. SSIZE represents the total size of
2009 block DST, or -1 if not known. ALIGN is the known alignment of DST. */
2012 emit_group_store (orig_dst, src, ssize, align)
2020 if (GET_CODE (src) != PARALLEL)
2023 /* Check for a NULL entry, used to indicate that the parameter goes
2024 both on the stack and in registers. */
2025 if (XEXP (XVECEXP (src, 0, 0), 0))
2030 tmps = (rtx *) alloca (sizeof (rtx) * XVECLEN (src, 0));
2032 /* Copy the (probable) hard regs into pseudos. */
2033 for (i = start; i < XVECLEN (src, 0); i++)
2035 rtx reg = XEXP (XVECEXP (src, 0, i), 0);
2036 tmps[i] = gen_reg_rtx (GET_MODE (reg));
2037 emit_move_insn (tmps[i], reg);
2041 /* If we won't be storing directly into memory, protect the real destination
2042 from strange tricks we might play. */
2044 if (GET_CODE (dst) == PARALLEL)
2048 /* We can get a PARALLEL dst if there is a conditional expression in
2049 a return statement. In that case, the dst and src are the same,
2050 so no action is necessary. */
2051 if (rtx_equal_p (dst, src))
2054 /* It is unclear if we can ever reach here, but we may as well handle
2055 it. Allocate a temporary, and split this into a store/load to/from
2058 temp = assign_stack_temp (GET_MODE (dst), ssize, 0);
2059 emit_group_store (temp, src, ssize, align);
2060 emit_group_load (dst, temp, ssize, align);
2063 else if (GET_CODE (dst) != MEM)
2065 dst = gen_reg_rtx (GET_MODE (orig_dst));
2066 /* Make life a bit easier for combine. */
2067 emit_move_insn (dst, const0_rtx);
2070 /* Process the pieces. */
2071 for (i = start; i < XVECLEN (src, 0); i++)
2073 HOST_WIDE_INT bytepos = INTVAL (XEXP (XVECEXP (src, 0, i), 1));
2074 enum machine_mode mode = GET_MODE (tmps[i]);
2075 unsigned int bytelen = GET_MODE_SIZE (mode);
2077 /* Handle trailing fragments that run over the size of the struct. */
2078 if (ssize >= 0 && bytepos + bytelen > ssize)
2080 if (BYTES_BIG_ENDIAN)
2082 int shift = (bytelen - (ssize - bytepos)) * BITS_PER_UNIT;
2083 expand_binop (mode, ashr_optab, tmps[i], GEN_INT (shift),
2084 tmps[i], 0, OPTAB_WIDEN);
2086 bytelen = ssize - bytepos;
2089 /* Optimize the access just a bit. */
2090 if (GET_CODE (dst) == MEM
2091 && align >= GET_MODE_ALIGNMENT (mode)
2092 && bytepos * BITS_PER_UNIT % GET_MODE_ALIGNMENT (mode) == 0
2093 && bytelen == GET_MODE_SIZE (mode))
2094 emit_move_insn (change_address (dst, mode,
2095 plus_constant (XEXP (dst, 0),
2099 store_bit_field (dst, bytelen * BITS_PER_UNIT, bytepos * BITS_PER_UNIT,
2100 mode, tmps[i], align, ssize);
2105 /* Copy from the pseudo into the (probable) hard reg. */
2106 if (GET_CODE (dst) == REG)
2107 emit_move_insn (orig_dst, dst);
2110 /* Generate code to copy a BLKmode object of TYPE out of a
2111 set of registers starting with SRCREG into TGTBLK. If TGTBLK
2112 is null, a stack temporary is created. TGTBLK is returned.
2114 The primary purpose of this routine is to handle functions
2115 that return BLKmode structures in registers. Some machines
2116 (the PA for example) want to return all small structures
2117 in registers regardless of the structure's alignment. */
2120 copy_blkmode_from_reg (tgtblk, srcreg, type)
2125 unsigned HOST_WIDE_INT bytes = int_size_in_bytes (type);
2126 rtx src = NULL, dst = NULL;
2127 unsigned HOST_WIDE_INT bitsize = MIN (TYPE_ALIGN (type), BITS_PER_WORD);
2128 unsigned HOST_WIDE_INT bitpos, xbitpos, big_endian_correction = 0;
2132 tgtblk = assign_stack_temp (BLKmode, bytes, 0);
2133 MEM_SET_IN_STRUCT_P (tgtblk, AGGREGATE_TYPE_P (type));
2134 preserve_temp_slots (tgtblk);
2137 /* This code assumes srcreg is at least a full word. If it isn't,
2138 copy it into a new pseudo which is a full word. */
2139 if (GET_MODE (srcreg) != BLKmode
2140 && GET_MODE_SIZE (GET_MODE (srcreg)) < UNITS_PER_WORD)
2141 srcreg = convert_to_mode (word_mode, srcreg, TREE_UNSIGNED (type));
2143 /* Structures whose size is not a multiple of a word are aligned
2144 to the least significant byte (to the right). On a BYTES_BIG_ENDIAN
2145 machine, this means we must skip the empty high order bytes when
2146 calculating the bit offset. */
2147 if (BYTES_BIG_ENDIAN && bytes % UNITS_PER_WORD)
2148 big_endian_correction
2149 = (BITS_PER_WORD - ((bytes % UNITS_PER_WORD) * BITS_PER_UNIT));
2151 /* Copy the structure BITSIZE bites at a time.
2153 We could probably emit more efficient code for machines which do not use
2154 strict alignment, but it doesn't seem worth the effort at the current
2156 for (bitpos = 0, xbitpos = big_endian_correction;
2157 bitpos < bytes * BITS_PER_UNIT;
2158 bitpos += bitsize, xbitpos += bitsize)
2160 /* We need a new source operand each time xbitpos is on a
2161 word boundary and when xbitpos == big_endian_correction
2162 (the first time through). */
2163 if (xbitpos % BITS_PER_WORD == 0
2164 || xbitpos == big_endian_correction)
2165 src = operand_subword_force (srcreg, xbitpos / BITS_PER_WORD, BLKmode);
2167 /* We need a new destination operand each time bitpos is on
2169 if (bitpos % BITS_PER_WORD == 0)
2170 dst = operand_subword (tgtblk, bitpos / BITS_PER_WORD, 1, BLKmode);
2172 /* Use xbitpos for the source extraction (right justified) and
2173 xbitpos for the destination store (left justified). */
2174 store_bit_field (dst, bitsize, bitpos % BITS_PER_WORD, word_mode,
2175 extract_bit_field (src, bitsize,
2176 xbitpos % BITS_PER_WORD, 1,
2177 NULL_RTX, word_mode, word_mode,
2178 bitsize, BITS_PER_WORD),
2179 bitsize, BITS_PER_WORD);
2185 /* Add a USE expression for REG to the (possibly empty) list pointed
2186 to by CALL_FUSAGE. REG must denote a hard register. */
2189 use_reg (call_fusage, reg)
2190 rtx *call_fusage, reg;
2192 if (GET_CODE (reg) != REG
2193 || REGNO (reg) >= FIRST_PSEUDO_REGISTER)
2197 = gen_rtx_EXPR_LIST (VOIDmode,
2198 gen_rtx_USE (VOIDmode, reg), *call_fusage);
2201 /* Add USE expressions to *CALL_FUSAGE for each of NREGS consecutive regs,
2202 starting at REGNO. All of these registers must be hard registers. */
2205 use_regs (call_fusage, regno, nregs)
2212 if (regno + nregs > FIRST_PSEUDO_REGISTER)
2215 for (i = 0; i < nregs; i++)
2216 use_reg (call_fusage, gen_rtx_REG (reg_raw_mode[regno + i], regno + i));
2219 /* Add USE expressions to *CALL_FUSAGE for each REG contained in the
2220 PARALLEL REGS. This is for calls that pass values in multiple
2221 non-contiguous locations. The Irix 6 ABI has examples of this. */
2224 use_group_regs (call_fusage, regs)
2230 for (i = 0; i < XVECLEN (regs, 0); i++)
2232 rtx reg = XEXP (XVECEXP (regs, 0, i), 0);
2234 /* A NULL entry means the parameter goes both on the stack and in
2235 registers. This can also be a MEM for targets that pass values
2236 partially on the stack and partially in registers. */
2237 if (reg != 0 && GET_CODE (reg) == REG)
2238 use_reg (call_fusage, reg);
2242 /* Generate several move instructions to clear LEN bytes of block TO. (A MEM
2243 rtx with BLKmode). The caller must pass TO through protect_from_queue
2244 before calling. ALIGN is maximum alignment we can assume. */
2247 clear_by_pieces (to, len, align)
2249 unsigned HOST_WIDE_INT len;
2252 struct clear_by_pieces data;
2253 rtx to_addr = XEXP (to, 0);
2254 unsigned HOST_WIDE_INT max_size = MOVE_MAX_PIECES + 1;
2255 enum machine_mode mode = VOIDmode, tmode;
2256 enum insn_code icode;
2259 data.to_addr = to_addr;
2262 = (GET_CODE (to_addr) == PRE_INC || GET_CODE (to_addr) == PRE_DEC
2263 || GET_CODE (to_addr) == POST_INC || GET_CODE (to_addr) == POST_DEC);
2265 data.explicit_inc_to = 0;
2267 = (GET_CODE (to_addr) == PRE_DEC || GET_CODE (to_addr) == POST_DEC);
2272 /* If copying requires more than two move insns,
2273 copy addresses to registers (to make displacements shorter)
2274 and use post-increment if available. */
2276 && move_by_pieces_ninsns (len, align) > 2)
2278 /* Determine the main mode we'll be using. */
2279 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
2280 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
2281 if (GET_MODE_SIZE (tmode) < max_size)
2284 if (USE_STORE_PRE_DECREMENT (mode) && data.reverse && ! data.autinc_to)
2286 data.to_addr = copy_addr_to_reg (plus_constant (to_addr, len));
2288 data.explicit_inc_to = -1;
2291 if (USE_STORE_POST_INCREMENT (mode) && ! data.reverse
2292 && ! data.autinc_to)
2294 data.to_addr = copy_addr_to_reg (to_addr);
2296 data.explicit_inc_to = 1;
2299 if ( !data.autinc_to && CONSTANT_P (to_addr))
2300 data.to_addr = copy_addr_to_reg (to_addr);
2303 if (! SLOW_UNALIGNED_ACCESS (word_mode, align)
2304 || align > MOVE_MAX * BITS_PER_UNIT || align >= BIGGEST_ALIGNMENT)
2305 align = MOVE_MAX * BITS_PER_UNIT;
2307 /* First move what we can in the largest integer mode, then go to
2308 successively smaller modes. */
2310 while (max_size > 1)
2312 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
2313 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
2314 if (GET_MODE_SIZE (tmode) < max_size)
2317 if (mode == VOIDmode)
2320 icode = mov_optab->handlers[(int) mode].insn_code;
2321 if (icode != CODE_FOR_nothing && align >= GET_MODE_ALIGNMENT (mode))
2322 clear_by_pieces_1 (GEN_FCN (icode), mode, &data);
2324 max_size = GET_MODE_SIZE (mode);
2327 /* The code above should have handled everything. */
2332 /* Subroutine of clear_by_pieces. Clear as many bytes as appropriate
2333 with move instructions for mode MODE. GENFUN is the gen_... function
2334 to make a move insn for that mode. DATA has all the other info. */
2337 clear_by_pieces_1 (genfun, mode, data)
2338 rtx (*genfun) PARAMS ((rtx, ...));
2339 enum machine_mode mode;
2340 struct clear_by_pieces *data;
2342 unsigned int size = GET_MODE_SIZE (mode);
2345 while (data->len >= size)
2348 data->offset -= size;
2350 if (data->autinc_to)
2352 to1 = gen_rtx_MEM (mode, data->to_addr);
2353 MEM_COPY_ATTRIBUTES (to1, data->to);
2356 to1 = change_address (data->to, mode,
2357 plus_constant (data->to_addr, data->offset));
2359 if (HAVE_PRE_DECREMENT && data->explicit_inc_to < 0)
2360 emit_insn (gen_add2_insn (data->to_addr, GEN_INT (-size)));
2362 emit_insn ((*genfun) (to1, const0_rtx));
2364 if (HAVE_POST_INCREMENT && data->explicit_inc_to > 0)
2365 emit_insn (gen_add2_insn (data->to_addr, GEN_INT (size)));
2367 if (! data->reverse)
2368 data->offset += size;
2374 /* Write zeros through the storage of OBJECT. If OBJECT has BLKmode, SIZE is
2375 its length in bytes and ALIGN is the maximum alignment we can is has.
2377 If we call a function that returns the length of the block, return it. */
2380 clear_storage (object, size, align)
2385 #ifdef TARGET_MEM_FUNCTIONS
2387 tree call_expr, arg_list;
2391 if (GET_MODE (object) == BLKmode)
2393 object = protect_from_queue (object, 1);
2394 size = protect_from_queue (size, 0);
2396 if (GET_CODE (size) == CONST_INT
2397 && MOVE_BY_PIECES_P (INTVAL (size), align))
2398 clear_by_pieces (object, INTVAL (size), align);
2401 /* Try the most limited insn first, because there's no point
2402 including more than one in the machine description unless
2403 the more limited one has some advantage. */
2405 rtx opalign = GEN_INT (align / BITS_PER_UNIT);
2406 enum machine_mode mode;
2408 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
2409 mode = GET_MODE_WIDER_MODE (mode))
2411 enum insn_code code = clrstr_optab[(int) mode];
2412 insn_operand_predicate_fn pred;
2414 if (code != CODE_FOR_nothing
2415 /* We don't need MODE to be narrower than
2416 BITS_PER_HOST_WIDE_INT here because if SIZE is less than
2417 the mode mask, as it is returned by the macro, it will
2418 definitely be less than the actual mode mask. */
2419 && ((GET_CODE (size) == CONST_INT
2420 && ((unsigned HOST_WIDE_INT) INTVAL (size)
2421 <= (GET_MODE_MASK (mode) >> 1)))
2422 || GET_MODE_BITSIZE (mode) >= BITS_PER_WORD)
2423 && ((pred = insn_data[(int) code].operand[0].predicate) == 0
2424 || (*pred) (object, BLKmode))
2425 && ((pred = insn_data[(int) code].operand[2].predicate) == 0
2426 || (*pred) (opalign, VOIDmode)))
2429 rtx last = get_last_insn ();
2432 op1 = convert_to_mode (mode, size, 1);
2433 pred = insn_data[(int) code].operand[1].predicate;
2434 if (pred != 0 && ! (*pred) (op1, mode))
2435 op1 = copy_to_mode_reg (mode, op1);
2437 pat = GEN_FCN ((int) code) (object, op1, opalign);
2444 delete_insns_since (last);
2448 /* OBJECT or SIZE may have been passed through protect_from_queue.
2450 It is unsafe to save the value generated by protect_from_queue
2451 and reuse it later. Consider what happens if emit_queue is
2452 called before the return value from protect_from_queue is used.
2454 Expansion of the CALL_EXPR below will call emit_queue before
2455 we are finished emitting RTL for argument setup. So if we are
2456 not careful we could get the wrong value for an argument.
2458 To avoid this problem we go ahead and emit code to copy OBJECT
2459 and SIZE into new pseudos. We can then place those new pseudos
2460 into an RTL_EXPR and use them later, even after a call to
2463 Note this is not strictly needed for library calls since they
2464 do not call emit_queue before loading their arguments. However,
2465 we may need to have library calls call emit_queue in the future
2466 since failing to do so could cause problems for targets which
2467 define SMALL_REGISTER_CLASSES and pass arguments in registers. */
2468 object = copy_to_mode_reg (Pmode, XEXP (object, 0));
2470 #ifdef TARGET_MEM_FUNCTIONS
2471 size = copy_to_mode_reg (TYPE_MODE (sizetype), size);
2473 size = convert_to_mode (TYPE_MODE (integer_type_node), size,
2474 TREE_UNSIGNED (integer_type_node));
2475 size = copy_to_mode_reg (TYPE_MODE (integer_type_node), size);
2478 #ifdef TARGET_MEM_FUNCTIONS
2479 /* It is incorrect to use the libcall calling conventions to call
2480 memset in this context.
2482 This could be a user call to memset and the user may wish to
2483 examine the return value from memset.
2485 For targets where libcalls and normal calls have different
2486 conventions for returning pointers, we could end up generating
2489 So instead of using a libcall sequence we build up a suitable
2490 CALL_EXPR and expand the call in the normal fashion. */
2491 if (fn == NULL_TREE)
2495 /* This was copied from except.c, I don't know if all this is
2496 necessary in this context or not. */
2497 fn = get_identifier ("memset");
2498 push_obstacks_nochange ();
2499 end_temporary_allocation ();
2500 fntype = build_pointer_type (void_type_node);
2501 fntype = build_function_type (fntype, NULL_TREE);
2502 fn = build_decl (FUNCTION_DECL, fn, fntype);
2503 ggc_add_tree_root (&fn, 1);
2504 DECL_EXTERNAL (fn) = 1;
2505 TREE_PUBLIC (fn) = 1;
2506 DECL_ARTIFICIAL (fn) = 1;
2507 make_decl_rtl (fn, NULL_PTR, 1);
2508 assemble_external (fn);
2512 /* We need to make an argument list for the function call.
2514 memset has three arguments, the first is a void * addresses, the
2515 second a integer with the initialization value, the last is a
2516 size_t byte count for the copy. */
2518 = build_tree_list (NULL_TREE,
2519 make_tree (build_pointer_type (void_type_node),
2521 TREE_CHAIN (arg_list)
2522 = build_tree_list (NULL_TREE,
2523 make_tree (integer_type_node, const0_rtx));
2524 TREE_CHAIN (TREE_CHAIN (arg_list))
2525 = build_tree_list (NULL_TREE, make_tree (sizetype, size));
2526 TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (arg_list))) = NULL_TREE;
2528 /* Now we have to build up the CALL_EXPR itself. */
2529 call_expr = build1 (ADDR_EXPR,
2530 build_pointer_type (TREE_TYPE (fn)), fn);
2531 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
2532 call_expr, arg_list, NULL_TREE);
2533 TREE_SIDE_EFFECTS (call_expr) = 1;
2535 retval = expand_expr (call_expr, NULL_RTX, VOIDmode, 0);
2537 emit_library_call (bzero_libfunc, 0,
2538 VOIDmode, 2, object, Pmode, size,
2539 TYPE_MODE (integer_type_node));
2544 emit_move_insn (object, CONST0_RTX (GET_MODE (object)));
2549 /* Generate code to copy Y into X.
2550 Both Y and X must have the same mode, except that
2551 Y can be a constant with VOIDmode.
2552 This mode cannot be BLKmode; use emit_block_move for that.
2554 Return the last instruction emitted. */
2557 emit_move_insn (x, y)
2560 enum machine_mode mode = GET_MODE (x);
2562 x = protect_from_queue (x, 1);
2563 y = protect_from_queue (y, 0);
2565 if (mode == BLKmode || (GET_MODE (y) != mode && GET_MODE (y) != VOIDmode))
2568 /* Never force constant_p_rtx to memory. */
2569 if (GET_CODE (y) == CONSTANT_P_RTX)
2571 else if (CONSTANT_P (y) && ! LEGITIMATE_CONSTANT_P (y))
2572 y = force_const_mem (mode, y);
2574 /* If X or Y are memory references, verify that their addresses are valid
2576 if (GET_CODE (x) == MEM
2577 && ((! memory_address_p (GET_MODE (x), XEXP (x, 0))
2578 && ! push_operand (x, GET_MODE (x)))
2580 && CONSTANT_ADDRESS_P (XEXP (x, 0)))))
2581 x = change_address (x, VOIDmode, XEXP (x, 0));
2583 if (GET_CODE (y) == MEM
2584 && (! memory_address_p (GET_MODE (y), XEXP (y, 0))
2586 && CONSTANT_ADDRESS_P (XEXP (y, 0)))))
2587 y = change_address (y, VOIDmode, XEXP (y, 0));
2589 if (mode == BLKmode)
2592 return emit_move_insn_1 (x, y);
2595 /* Low level part of emit_move_insn.
2596 Called just like emit_move_insn, but assumes X and Y
2597 are basically valid. */
2600 emit_move_insn_1 (x, y)
2603 enum machine_mode mode = GET_MODE (x);
2604 enum machine_mode submode;
2605 enum mode_class class = GET_MODE_CLASS (mode);
2608 if (mode >= MAX_MACHINE_MODE)
2611 if (mov_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing)
2613 emit_insn (GEN_FCN (mov_optab->handlers[(int) mode].insn_code) (x, y));
2615 /* Expand complex moves by moving real part and imag part, if possible. */
2616 else if ((class == MODE_COMPLEX_FLOAT || class == MODE_COMPLEX_INT)
2617 && BLKmode != (submode = mode_for_size ((GET_MODE_UNIT_SIZE (mode)
2619 (class == MODE_COMPLEX_INT
2620 ? MODE_INT : MODE_FLOAT),
2622 && (mov_optab->handlers[(int) submode].insn_code
2623 != CODE_FOR_nothing))
2625 /* Don't split destination if it is a stack push. */
2626 int stack = push_operand (x, GET_MODE (x));
2628 /* If this is a stack, push the highpart first, so it
2629 will be in the argument order.
2631 In that case, change_address is used only to convert
2632 the mode, not to change the address. */
2635 /* Note that the real part always precedes the imag part in memory
2636 regardless of machine's endianness. */
2637 #ifdef STACK_GROWS_DOWNWARD
2638 emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code)
2639 (gen_rtx_MEM (submode, XEXP (x, 0)),
2640 gen_imagpart (submode, y)));
2641 emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code)
2642 (gen_rtx_MEM (submode, XEXP (x, 0)),
2643 gen_realpart (submode, y)));
2645 emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code)
2646 (gen_rtx_MEM (submode, XEXP (x, 0)),
2647 gen_realpart (submode, y)));
2648 emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code)
2649 (gen_rtx_MEM (submode, XEXP (x, 0)),
2650 gen_imagpart (submode, y)));
2655 rtx realpart_x, realpart_y;
2656 rtx imagpart_x, imagpart_y;
2658 /* If this is a complex value with each part being smaller than a
2659 word, the usual calling sequence will likely pack the pieces into
2660 a single register. Unfortunately, SUBREG of hard registers only
2661 deals in terms of words, so we have a problem converting input
2662 arguments to the CONCAT of two registers that is used elsewhere
2663 for complex values. If this is before reload, we can copy it into
2664 memory and reload. FIXME, we should see about using extract and
2665 insert on integer registers, but complex short and complex char
2666 variables should be rarely used. */
2667 if (GET_MODE_BITSIZE (mode) < 2 * BITS_PER_WORD
2668 && (reload_in_progress | reload_completed) == 0)
2670 int packed_dest_p = (REG_P (x) && REGNO (x) < FIRST_PSEUDO_REGISTER);
2671 int packed_src_p = (REG_P (y) && REGNO (y) < FIRST_PSEUDO_REGISTER);
2673 if (packed_dest_p || packed_src_p)
2675 enum mode_class reg_class = ((class == MODE_COMPLEX_FLOAT)
2676 ? MODE_FLOAT : MODE_INT);
2678 enum machine_mode reg_mode =
2679 mode_for_size (GET_MODE_BITSIZE (mode), reg_class, 1);
2681 if (reg_mode != BLKmode)
2683 rtx mem = assign_stack_temp (reg_mode,
2684 GET_MODE_SIZE (mode), 0);
2686 rtx cmem = change_address (mem, mode, NULL_RTX);
2688 cfun->cannot_inline = N_("function using short complex types cannot be inline");
2692 rtx sreg = gen_rtx_SUBREG (reg_mode, x, 0);
2693 emit_move_insn_1 (cmem, y);
2694 return emit_move_insn_1 (sreg, mem);
2698 rtx sreg = gen_rtx_SUBREG (reg_mode, y, 0);
2699 emit_move_insn_1 (mem, sreg);
2700 return emit_move_insn_1 (x, cmem);
2706 realpart_x = gen_realpart (submode, x);
2707 realpart_y = gen_realpart (submode, y);
2708 imagpart_x = gen_imagpart (submode, x);
2709 imagpart_y = gen_imagpart (submode, y);
2711 /* Show the output dies here. This is necessary for SUBREGs
2712 of pseudos since we cannot track their lifetimes correctly;
2713 hard regs shouldn't appear here except as return values.
2714 We never want to emit such a clobber after reload. */
2716 && ! (reload_in_progress || reload_completed)
2717 && (GET_CODE (realpart_x) == SUBREG
2718 || GET_CODE (imagpart_x) == SUBREG))
2720 emit_insn (gen_rtx_CLOBBER (VOIDmode, x));
2723 emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code)
2724 (realpart_x, realpart_y));
2725 emit_insn (GEN_FCN (mov_optab->handlers[(int) submode].insn_code)
2726 (imagpart_x, imagpart_y));
2729 return get_last_insn ();
2732 /* This will handle any multi-word mode that lacks a move_insn pattern.
2733 However, you will get better code if you define such patterns,
2734 even if they must turn into multiple assembler instructions. */
2735 else if (GET_MODE_SIZE (mode) > UNITS_PER_WORD)
2741 #ifdef PUSH_ROUNDING
2743 /* If X is a push on the stack, do the push now and replace
2744 X with a reference to the stack pointer. */
2745 if (push_operand (x, GET_MODE (x)))
2747 anti_adjust_stack (GEN_INT (GET_MODE_SIZE (GET_MODE (x))));
2748 x = change_address (x, VOIDmode, stack_pointer_rtx);
2752 /* If we are in reload, see if either operand is a MEM whose address
2753 is scheduled for replacement. */
2754 if (reload_in_progress && GET_CODE (x) == MEM
2755 && (inner = find_replacement (&XEXP (x, 0))) != XEXP (x, 0))
2757 rtx new = gen_rtx_MEM (GET_MODE (x), inner);
2759 MEM_COPY_ATTRIBUTES (new, x);
2762 if (reload_in_progress && GET_CODE (y) == MEM
2763 && (inner = find_replacement (&XEXP (y, 0))) != XEXP (y, 0))
2765 rtx new = gen_rtx_MEM (GET_MODE (y), inner);
2767 MEM_COPY_ATTRIBUTES (new, y);
2775 i < (GET_MODE_SIZE (mode) + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD;
2778 rtx xpart = operand_subword (x, i, 1, mode);
2779 rtx ypart = operand_subword (y, i, 1, mode);
2781 /* If we can't get a part of Y, put Y into memory if it is a
2782 constant. Otherwise, force it into a register. If we still
2783 can't get a part of Y, abort. */
2784 if (ypart == 0 && CONSTANT_P (y))
2786 y = force_const_mem (mode, y);
2787 ypart = operand_subword (y, i, 1, mode);
2789 else if (ypart == 0)
2790 ypart = operand_subword_force (y, i, mode);
2792 if (xpart == 0 || ypart == 0)
2795 need_clobber |= (GET_CODE (xpart) == SUBREG);
2797 last_insn = emit_move_insn (xpart, ypart);
2800 seq = gen_sequence ();
2803 /* Show the output dies here. This is necessary for SUBREGs
2804 of pseudos since we cannot track their lifetimes correctly;
2805 hard regs shouldn't appear here except as return values.
2806 We never want to emit such a clobber after reload. */
2808 && ! (reload_in_progress || reload_completed)
2809 && need_clobber != 0)
2811 emit_insn (gen_rtx_CLOBBER (VOIDmode, x));
2822 /* Pushing data onto the stack. */
2824 /* Push a block of length SIZE (perhaps variable)
2825 and return an rtx to address the beginning of the block.
2826 Note that it is not possible for the value returned to be a QUEUED.
2827 The value may be virtual_outgoing_args_rtx.
2829 EXTRA is the number of bytes of padding to push in addition to SIZE.
2830 BELOW nonzero means this padding comes at low addresses;
2831 otherwise, the padding comes at high addresses. */
2834 push_block (size, extra, below)
2840 size = convert_modes (Pmode, ptr_mode, size, 1);
2841 if (CONSTANT_P (size))
2842 anti_adjust_stack (plus_constant (size, extra));
2843 else if (GET_CODE (size) == REG && extra == 0)
2844 anti_adjust_stack (size);
2847 temp = copy_to_mode_reg (Pmode, size);
2849 temp = expand_binop (Pmode, add_optab, temp, GEN_INT (extra),
2850 temp, 0, OPTAB_LIB_WIDEN);
2851 anti_adjust_stack (temp);
2854 #ifndef STACK_GROWS_DOWNWARD
2855 #ifdef ARGS_GROW_DOWNWARD
2856 if (!ACCUMULATE_OUTGOING_ARGS)
2864 /* Return the lowest stack address when STACK or ARGS grow downward and
2865 we are not aaccumulating outgoing arguments (the c4x port uses such
2867 temp = virtual_outgoing_args_rtx;
2868 if (extra != 0 && below)
2869 temp = plus_constant (temp, extra);
2873 if (GET_CODE (size) == CONST_INT)
2874 temp = plus_constant (virtual_outgoing_args_rtx,
2875 -INTVAL (size) - (below ? 0 : extra));
2876 else if (extra != 0 && !below)
2877 temp = gen_rtx_PLUS (Pmode, virtual_outgoing_args_rtx,
2878 negate_rtx (Pmode, plus_constant (size, extra)));
2880 temp = gen_rtx_PLUS (Pmode, virtual_outgoing_args_rtx,
2881 negate_rtx (Pmode, size));
2884 return memory_address (GET_CLASS_NARROWEST_MODE (MODE_INT), temp);
2890 return gen_rtx_fmt_e (STACK_PUSH_CODE, Pmode, stack_pointer_rtx);
2893 /* Return an rtx for the address of the beginning of a as-if-it-was-pushed
2894 block of SIZE bytes. */
2897 get_push_address (size)
2902 if (STACK_PUSH_CODE == POST_DEC)
2903 temp = gen_rtx_PLUS (Pmode, stack_pointer_rtx, GEN_INT (size));
2904 else if (STACK_PUSH_CODE == POST_INC)
2905 temp = gen_rtx_MINUS (Pmode, stack_pointer_rtx, GEN_INT (size));
2907 temp = stack_pointer_rtx;
2909 return copy_to_reg (temp);
2912 /* Generate code to push X onto the stack, assuming it has mode MODE and
2914 MODE is redundant except when X is a CONST_INT (since they don't
2916 SIZE is an rtx for the size of data to be copied (in bytes),
2917 needed only if X is BLKmode.
2919 ALIGN is maximum alignment we can assume.
2921 If PARTIAL and REG are both nonzero, then copy that many of the first
2922 words of X into registers starting with REG, and push the rest of X.
2923 The amount of space pushed is decreased by PARTIAL words,
2924 rounded *down* to a multiple of PARM_BOUNDARY.
2925 REG must be a hard register in this case.
2926 If REG is zero but PARTIAL is not, take any all others actions for an
2927 argument partially in registers, but do not actually load any
2930 EXTRA is the amount in bytes of extra space to leave next to this arg.
2931 This is ignored if an argument block has already been allocated.
2933 On a machine that lacks real push insns, ARGS_ADDR is the address of
2934 the bottom of the argument block for this call. We use indexing off there
2935 to store the arg. On machines with push insns, ARGS_ADDR is 0 when a
2936 argument block has not been preallocated.
2938 ARGS_SO_FAR is the size of args previously pushed for this call.
2940 REG_PARM_STACK_SPACE is nonzero if functions require stack space
2941 for arguments passed in registers. If nonzero, it will be the number
2942 of bytes required. */
2945 emit_push_insn (x, mode, type, size, align, partial, reg, extra,
2946 args_addr, args_so_far, reg_parm_stack_space,
2949 enum machine_mode mode;
2958 int reg_parm_stack_space;
2962 enum direction stack_direction
2963 #ifdef STACK_GROWS_DOWNWARD
2969 /* Decide where to pad the argument: `downward' for below,
2970 `upward' for above, or `none' for don't pad it.
2971 Default is below for small data on big-endian machines; else above. */
2972 enum direction where_pad = FUNCTION_ARG_PADDING (mode, type);
2974 /* Invert direction if stack is post-update. */
2975 if (STACK_PUSH_CODE == POST_INC || STACK_PUSH_CODE == POST_DEC)
2976 if (where_pad != none)
2977 where_pad = (where_pad == downward ? upward : downward);
2979 xinner = x = protect_from_queue (x, 0);
2981 if (mode == BLKmode)
2983 /* Copy a block into the stack, entirely or partially. */
2986 int used = partial * UNITS_PER_WORD;
2987 int offset = used % (PARM_BOUNDARY / BITS_PER_UNIT);
2995 /* USED is now the # of bytes we need not copy to the stack
2996 because registers will take care of them. */
2999 xinner = change_address (xinner, BLKmode,
3000 plus_constant (XEXP (xinner, 0), used));
3002 /* If the partial register-part of the arg counts in its stack size,
3003 skip the part of stack space corresponding to the registers.
3004 Otherwise, start copying to the beginning of the stack space,
3005 by setting SKIP to 0. */
3006 skip = (reg_parm_stack_space == 0) ? 0 : used;
3008 #ifdef PUSH_ROUNDING
3009 /* Do it with several push insns if that doesn't take lots of insns
3010 and if there is no difficulty with push insns that skip bytes
3011 on the stack for alignment purposes. */
3014 && GET_CODE (size) == CONST_INT
3016 && (MOVE_BY_PIECES_P ((unsigned) INTVAL (size) - used, align))
3017 /* Here we avoid the case of a structure whose weak alignment
3018 forces many pushes of a small amount of data,
3019 and such small pushes do rounding that causes trouble. */
3020 && ((! SLOW_UNALIGNED_ACCESS (word_mode, align))
3021 || align >= BIGGEST_ALIGNMENT
3022 || PUSH_ROUNDING (align) == align)
3023 && PUSH_ROUNDING (INTVAL (size)) == INTVAL (size))
3025 /* Push padding now if padding above and stack grows down,
3026 or if padding below and stack grows up.
3027 But if space already allocated, this has already been done. */
3028 if (extra && args_addr == 0
3029 && where_pad != none && where_pad != stack_direction)
3030 anti_adjust_stack (GEN_INT (extra));
3032 stack_pointer_delta += INTVAL (size) - used;
3033 move_by_pieces (gen_rtx_MEM (BLKmode, gen_push_operand ()), xinner,
3034 INTVAL (size) - used, align);
3036 if (current_function_check_memory_usage && ! in_check_memory_usage)
3040 in_check_memory_usage = 1;
3041 temp = get_push_address (INTVAL (size) - used);
3042 if (GET_CODE (x) == MEM && type && AGGREGATE_TYPE_P (type))
3043 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
3045 XEXP (xinner, 0), Pmode,
3046 GEN_INT (INTVAL (size) - used),
3047 TYPE_MODE (sizetype));
3049 emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3,
3051 GEN_INT (INTVAL (size) - used),
3052 TYPE_MODE (sizetype),
3053 GEN_INT (MEMORY_USE_RW),
3054 TYPE_MODE (integer_type_node));
3055 in_check_memory_usage = 0;
3059 #endif /* PUSH_ROUNDING */
3063 /* Otherwise make space on the stack and copy the data
3064 to the address of that space. */
3066 /* Deduct words put into registers from the size we must copy. */
3069 if (GET_CODE (size) == CONST_INT)
3070 size = GEN_INT (INTVAL (size) - used);
3072 size = expand_binop (GET_MODE (size), sub_optab, size,
3073 GEN_INT (used), NULL_RTX, 0,
3077 /* Get the address of the stack space.
3078 In this case, we do not deal with EXTRA separately.
3079 A single stack adjust will do. */
3082 temp = push_block (size, extra, where_pad == downward);
3085 else if (GET_CODE (args_so_far) == CONST_INT)
3086 temp = memory_address (BLKmode,
3087 plus_constant (args_addr,
3088 skip + INTVAL (args_so_far)));
3090 temp = memory_address (BLKmode,
3091 plus_constant (gen_rtx_PLUS (Pmode,
3095 if (current_function_check_memory_usage && ! in_check_memory_usage)
3097 in_check_memory_usage = 1;
3098 target = copy_to_reg (temp);
3099 if (GET_CODE (x) == MEM && type && AGGREGATE_TYPE_P (type))
3100 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
3102 XEXP (xinner, 0), Pmode,
3103 size, TYPE_MODE (sizetype));
3105 emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3,
3107 size, TYPE_MODE (sizetype),
3108 GEN_INT (MEMORY_USE_RW),
3109 TYPE_MODE (integer_type_node));
3110 in_check_memory_usage = 0;
3113 target = gen_rtx_MEM (BLKmode, temp);
3117 set_mem_attributes (target, type, 1);
3118 /* Function incoming arguments may overlap with sibling call
3119 outgoing arguments and we cannot allow reordering of reads
3120 from function arguments with stores to outgoing arguments
3121 of sibling calls. */
3122 MEM_ALIAS_SET (target) = 0;
3125 /* TEMP is the address of the block. Copy the data there. */
3126 if (GET_CODE (size) == CONST_INT
3127 && MOVE_BY_PIECES_P ((unsigned) INTVAL (size), align))
3129 move_by_pieces (target, xinner, INTVAL (size), align);
3134 rtx opalign = GEN_INT (align / BITS_PER_UNIT);
3135 enum machine_mode mode;
3137 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
3139 mode = GET_MODE_WIDER_MODE (mode))
3141 enum insn_code code = movstr_optab[(int) mode];
3142 insn_operand_predicate_fn pred;
3144 if (code != CODE_FOR_nothing
3145 && ((GET_CODE (size) == CONST_INT
3146 && ((unsigned HOST_WIDE_INT) INTVAL (size)
3147 <= (GET_MODE_MASK (mode) >> 1)))
3148 || GET_MODE_BITSIZE (mode) >= BITS_PER_WORD)
3149 && (!(pred = insn_data[(int) code].operand[0].predicate)
3150 || ((*pred) (target, BLKmode)))
3151 && (!(pred = insn_data[(int) code].operand[1].predicate)
3152 || ((*pred) (xinner, BLKmode)))
3153 && (!(pred = insn_data[(int) code].operand[3].predicate)
3154 || ((*pred) (opalign, VOIDmode))))
3156 rtx op2 = convert_to_mode (mode, size, 1);
3157 rtx last = get_last_insn ();
3160 pred = insn_data[(int) code].operand[2].predicate;
3161 if (pred != 0 && ! (*pred) (op2, mode))
3162 op2 = copy_to_mode_reg (mode, op2);
3164 pat = GEN_FCN ((int) code) (target, xinner,
3172 delete_insns_since (last);
3177 if (!ACCUMULATE_OUTGOING_ARGS)
3179 /* If the source is referenced relative to the stack pointer,
3180 copy it to another register to stabilize it. We do not need
3181 to do this if we know that we won't be changing sp. */
3183 if (reg_mentioned_p (virtual_stack_dynamic_rtx, temp)
3184 || reg_mentioned_p (virtual_outgoing_args_rtx, temp))
3185 temp = copy_to_reg (temp);
3188 /* Make inhibit_defer_pop nonzero around the library call
3189 to force it to pop the bcopy-arguments right away. */
3191 #ifdef TARGET_MEM_FUNCTIONS
3192 emit_library_call (memcpy_libfunc, 0,
3193 VOIDmode, 3, temp, Pmode, XEXP (xinner, 0), Pmode,
3194 convert_to_mode (TYPE_MODE (sizetype),
3195 size, TREE_UNSIGNED (sizetype)),
3196 TYPE_MODE (sizetype));
3198 emit_library_call (bcopy_libfunc, 0,
3199 VOIDmode, 3, XEXP (xinner, 0), Pmode, temp, Pmode,
3200 convert_to_mode (TYPE_MODE (integer_type_node),
3202 TREE_UNSIGNED (integer_type_node)),
3203 TYPE_MODE (integer_type_node));
3208 else if (partial > 0)
3210 /* Scalar partly in registers. */
3212 int size = GET_MODE_SIZE (mode) / UNITS_PER_WORD;
3215 /* # words of start of argument
3216 that we must make space for but need not store. */
3217 int offset = partial % (PARM_BOUNDARY / BITS_PER_WORD);
3218 int args_offset = INTVAL (args_so_far);
3221 /* Push padding now if padding above and stack grows down,
3222 or if padding below and stack grows up.
3223 But if space already allocated, this has already been done. */
3224 if (extra && args_addr == 0
3225 && where_pad != none && where_pad != stack_direction)
3226 anti_adjust_stack (GEN_INT (extra));
3228 /* If we make space by pushing it, we might as well push
3229 the real data. Otherwise, we can leave OFFSET nonzero
3230 and leave the space uninitialized. */
3234 /* Now NOT_STACK gets the number of words that we don't need to
3235 allocate on the stack. */
3236 not_stack = partial - offset;
3238 /* If the partial register-part of the arg counts in its stack size,
3239 skip the part of stack space corresponding to the registers.
3240 Otherwise, start copying to the beginning of the stack space,
3241 by setting SKIP to 0. */
3242 skip = (reg_parm_stack_space == 0) ? 0 : not_stack;
3244 if (CONSTANT_P (x) && ! LEGITIMATE_CONSTANT_P (x))
3245 x = validize_mem (force_const_mem (mode, x));
3247 /* If X is a hard register in a non-integer mode, copy it into a pseudo;
3248 SUBREGs of such registers are not allowed. */
3249 if ((GET_CODE (x) == REG && REGNO (x) < FIRST_PSEUDO_REGISTER
3250 && GET_MODE_CLASS (GET_MODE (x)) != MODE_INT))
3251 x = copy_to_reg (x);
3253 /* Loop over all the words allocated on the stack for this arg. */
3254 /* We can do it by words, because any scalar bigger than a word
3255 has a size a multiple of a word. */
3256 #ifndef PUSH_ARGS_REVERSED
3257 for (i = not_stack; i < size; i++)
3259 for (i = size - 1; i >= not_stack; i--)
3261 if (i >= not_stack + offset)
3262 emit_push_insn (operand_subword_force (x, i, mode),
3263 word_mode, NULL_TREE, NULL_RTX, align, 0, NULL_RTX,
3265 GEN_INT (args_offset + ((i - not_stack + skip)
3267 reg_parm_stack_space, alignment_pad);
3272 rtx target = NULL_RTX;
3275 /* Push padding now if padding above and stack grows down,
3276 or if padding below and stack grows up.
3277 But if space already allocated, this has already been done. */
3278 if (extra && args_addr == 0
3279 && where_pad != none && where_pad != stack_direction)
3280 anti_adjust_stack (GEN_INT (extra));
3282 #ifdef PUSH_ROUNDING
3283 if (args_addr == 0 && PUSH_ARGS)
3285 addr = gen_push_operand ();
3286 stack_pointer_delta += PUSH_ROUNDING (GET_MODE_SIZE (mode));
3291 if (GET_CODE (args_so_far) == CONST_INT)
3293 = memory_address (mode,
3294 plus_constant (args_addr,
3295 INTVAL (args_so_far)));
3297 addr = memory_address (mode, gen_rtx_PLUS (Pmode, args_addr,
3302 dest = gen_rtx_MEM (mode, addr);
3305 set_mem_attributes (dest, type, 1);
3306 /* Function incoming arguments may overlap with sibling call
3307 outgoing arguments and we cannot allow reordering of reads
3308 from function arguments with stores to outgoing arguments
3309 of sibling calls. */
3310 MEM_ALIAS_SET (dest) = 0;
3313 emit_move_insn (dest, x);
3315 if (current_function_check_memory_usage && ! in_check_memory_usage)
3317 in_check_memory_usage = 1;
3319 target = get_push_address (GET_MODE_SIZE (mode));
3321 if (GET_CODE (x) == MEM && type && AGGREGATE_TYPE_P (type))
3322 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
3325 GEN_INT (GET_MODE_SIZE (mode)),
3326 TYPE_MODE (sizetype));
3328 emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3,
3330 GEN_INT (GET_MODE_SIZE (mode)),
3331 TYPE_MODE (sizetype),
3332 GEN_INT (MEMORY_USE_RW),
3333 TYPE_MODE (integer_type_node));
3334 in_check_memory_usage = 0;
3339 /* If part should go in registers, copy that part
3340 into the appropriate registers. Do this now, at the end,
3341 since mem-to-mem copies above may do function calls. */
3342 if (partial > 0 && reg != 0)
3344 /* Handle calls that pass values in multiple non-contiguous locations.
3345 The Irix 6 ABI has examples of this. */
3346 if (GET_CODE (reg) == PARALLEL)
3347 emit_group_load (reg, x, -1, align); /* ??? size? */
3349 move_block_to_reg (REGNO (reg), x, partial, mode);
3352 if (extra && args_addr == 0 && where_pad == stack_direction)
3353 anti_adjust_stack (GEN_INT (extra));
3355 if (alignment_pad && args_addr == 0)
3356 anti_adjust_stack (alignment_pad);
3359 /* Return X if X can be used as a subtarget in a sequence of arithmetic
3367 /* Only registers can be subtargets. */
3368 || GET_CODE (x) != REG
3369 /* If the register is readonly, it can't be set more than once. */
3370 || RTX_UNCHANGING_P (x)
3371 /* Don't use hard regs to avoid extending their life. */
3372 || REGNO (x) < FIRST_PSEUDO_REGISTER
3373 /* Avoid subtargets inside loops,
3374 since they hide some invariant expressions. */
3375 || preserve_subexpressions_p ())
3379 /* Expand an assignment that stores the value of FROM into TO.
3380 If WANT_VALUE is nonzero, return an rtx for the value of TO.
3381 (This may contain a QUEUED rtx;
3382 if the value is constant, this rtx is a constant.)
3383 Otherwise, the returned value is NULL_RTX.
3385 SUGGEST_REG is no longer actually used.
3386 It used to mean, copy the value through a register
3387 and return that register, if that is possible.
3388 We now use WANT_VALUE to decide whether to do this. */
3391 expand_assignment (to, from, want_value, suggest_reg)
3394 int suggest_reg ATTRIBUTE_UNUSED;
3396 register rtx to_rtx = 0;
3399 /* Don't crash if the lhs of the assignment was erroneous. */
3401 if (TREE_CODE (to) == ERROR_MARK)
3403 result = expand_expr (from, NULL_RTX, VOIDmode, 0);
3404 return want_value ? result : NULL_RTX;
3407 /* Assignment of a structure component needs special treatment
3408 if the structure component's rtx is not simply a MEM.
3409 Assignment of an array element at a constant index, and assignment of
3410 an array element in an unaligned packed structure field, has the same
3413 if (TREE_CODE (to) == COMPONENT_REF || TREE_CODE (to) == BIT_FIELD_REF
3414 || TREE_CODE (to) == ARRAY_REF)
3416 enum machine_mode mode1;
3417 HOST_WIDE_INT bitsize, bitpos;
3422 unsigned int alignment;
3425 tem = get_inner_reference (to, &bitsize, &bitpos, &offset, &mode1,
3426 &unsignedp, &volatilep, &alignment);
3428 /* If we are going to use store_bit_field and extract_bit_field,
3429 make sure to_rtx will be safe for multiple use. */
3431 if (mode1 == VOIDmode && want_value)
3432 tem = stabilize_reference (tem);
3434 to_rtx = expand_expr (tem, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_DONT);
3437 rtx offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, 0);
3439 if (GET_CODE (to_rtx) != MEM)
3442 if (GET_MODE (offset_rtx) != ptr_mode)
3444 #ifdef POINTERS_EXTEND_UNSIGNED
3445 offset_rtx = convert_memory_address (ptr_mode, offset_rtx);
3447 offset_rtx = convert_to_mode (ptr_mode, offset_rtx, 0);
3451 /* A constant address in TO_RTX can have VOIDmode, we must not try
3452 to call force_reg for that case. Avoid that case. */
3453 if (GET_CODE (to_rtx) == MEM
3454 && GET_MODE (to_rtx) == BLKmode
3455 && GET_MODE (XEXP (to_rtx, 0)) != VOIDmode
3457 && (bitpos % bitsize) == 0
3458 && (bitsize % GET_MODE_ALIGNMENT (mode1)) == 0
3459 && alignment == GET_MODE_ALIGNMENT (mode1))
3461 rtx temp = change_address (to_rtx, mode1,
3462 plus_constant (XEXP (to_rtx, 0),
3465 if (GET_CODE (XEXP (temp, 0)) == REG)
3468 to_rtx = change_address (to_rtx, mode1,
3469 force_reg (GET_MODE (XEXP (temp, 0)),
3474 to_rtx = change_address (to_rtx, VOIDmode,
3475 gen_rtx_PLUS (ptr_mode, XEXP (to_rtx, 0),
3476 force_reg (ptr_mode,
3482 if (GET_CODE (to_rtx) == MEM)
3484 /* When the offset is zero, to_rtx is the address of the
3485 structure we are storing into, and hence may be shared.
3486 We must make a new MEM before setting the volatile bit. */
3488 to_rtx = copy_rtx (to_rtx);
3490 MEM_VOLATILE_P (to_rtx) = 1;
3492 #if 0 /* This was turned off because, when a field is volatile
3493 in an object which is not volatile, the object may be in a register,
3494 and then we would abort over here. */
3500 if (TREE_CODE (to) == COMPONENT_REF
3501 && TREE_READONLY (TREE_OPERAND (to, 1)))
3504 to_rtx = copy_rtx (to_rtx);
3506 RTX_UNCHANGING_P (to_rtx) = 1;
3509 /* Check the access. */
3510 if (current_function_check_memory_usage && GET_CODE (to_rtx) == MEM)
3515 enum machine_mode best_mode;
3517 best_mode = get_best_mode (bitsize, bitpos,
3518 TYPE_ALIGN (TREE_TYPE (tem)),
3520 if (best_mode == VOIDmode)
3523 best_mode_size = GET_MODE_BITSIZE (best_mode);
3524 to_addr = plus_constant (XEXP (to_rtx, 0), (bitpos / BITS_PER_UNIT));
3525 size = CEIL ((bitpos % best_mode_size) + bitsize, best_mode_size);
3526 size *= GET_MODE_SIZE (best_mode);
3528 /* Check the access right of the pointer. */
3529 in_check_memory_usage = 1;
3531 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
3533 GEN_INT (size), TYPE_MODE (sizetype),
3534 GEN_INT (MEMORY_USE_WO),
3535 TYPE_MODE (integer_type_node));
3536 in_check_memory_usage = 0;
3539 /* If this is a varying-length object, we must get the address of
3540 the source and do an explicit block move. */
3543 unsigned int from_align;
3544 rtx from_rtx = expand_expr_unaligned (from, &from_align);
3546 = change_address (to_rtx, VOIDmode,
3547 plus_constant (XEXP (to_rtx, 0),
3548 bitpos / BITS_PER_UNIT));
3550 emit_block_move (inner_to_rtx, from_rtx, expr_size (from),
3551 MIN (alignment, from_align));
3558 result = store_field (to_rtx, bitsize, bitpos, mode1, from,
3560 /* Spurious cast for HPUX compiler. */
3561 ? ((enum machine_mode)
3562 TYPE_MODE (TREE_TYPE (to)))
3566 int_size_in_bytes (TREE_TYPE (tem)),
3567 get_alias_set (to));
3569 preserve_temp_slots (result);
3573 /* If the value is meaningful, convert RESULT to the proper mode.
3574 Otherwise, return nothing. */
3575 return (want_value ? convert_modes (TYPE_MODE (TREE_TYPE (to)),
3576 TYPE_MODE (TREE_TYPE (from)),
3578 TREE_UNSIGNED (TREE_TYPE (to)))
3583 /* If the rhs is a function call and its value is not an aggregate,
3584 call the function before we start to compute the lhs.
3585 This is needed for correct code for cases such as
3586 val = setjmp (buf) on machines where reference to val
3587 requires loading up part of an address in a separate insn.
3589 Don't do this if TO is a VAR_DECL or PARM_DECL whose DECL_RTL is REG
3590 since it might be a promoted variable where the zero- or sign- extension
3591 needs to be done. Handling this in the normal way is safe because no
3592 computation is done before the call. */
3593 if (TREE_CODE (from) == CALL_EXPR && ! aggregate_value_p (from)
3594 && TREE_CODE (TYPE_SIZE (TREE_TYPE (from))) == INTEGER_CST
3595 && ! ((TREE_CODE (to) == VAR_DECL || TREE_CODE (to) == PARM_DECL)
3596 && GET_CODE (DECL_RTL (to)) == REG))
3601 value = expand_expr (from, NULL_RTX, VOIDmode, 0);
3603 to_rtx = expand_expr (to, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_WO);
3605 /* Handle calls that return values in multiple non-contiguous locations.
3606 The Irix 6 ABI has examples of this. */
3607 if (GET_CODE (to_rtx) == PARALLEL)
3608 emit_group_load (to_rtx, value, int_size_in_bytes (TREE_TYPE (from)),
3609 TYPE_ALIGN (TREE_TYPE (from)));
3610 else if (GET_MODE (to_rtx) == BLKmode)
3611 emit_block_move (to_rtx, value, expr_size (from),
3612 TYPE_ALIGN (TREE_TYPE (from)));
3615 #ifdef POINTERS_EXTEND_UNSIGNED
3616 if (TREE_CODE (TREE_TYPE (to)) == REFERENCE_TYPE
3617 || TREE_CODE (TREE_TYPE (to)) == POINTER_TYPE)
3618 value = convert_memory_address (GET_MODE (to_rtx), value);
3620 emit_move_insn (to_rtx, value);
3622 preserve_temp_slots (to_rtx);
3625 return want_value ? to_rtx : NULL_RTX;
3628 /* Ordinary treatment. Expand TO to get a REG or MEM rtx.
3629 Don't re-expand if it was expanded already (in COMPONENT_REF case). */
3633 to_rtx = expand_expr (to, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_WO);
3634 if (GET_CODE (to_rtx) == MEM)
3635 MEM_ALIAS_SET (to_rtx) = get_alias_set (to);
3638 /* Don't move directly into a return register. */
3639 if (TREE_CODE (to) == RESULT_DECL
3640 && (GET_CODE (to_rtx) == REG || GET_CODE (to_rtx) == PARALLEL))
3645 temp = expand_expr (from, 0, GET_MODE (to_rtx), 0);
3647 if (GET_CODE (to_rtx) == PARALLEL)
3648 emit_group_load (to_rtx, temp, int_size_in_bytes (TREE_TYPE (from)),
3649 TYPE_ALIGN (TREE_TYPE (from)));
3651 emit_move_insn (to_rtx, temp);
3653 preserve_temp_slots (to_rtx);
3656 return want_value ? to_rtx : NULL_RTX;
3659 /* In case we are returning the contents of an object which overlaps
3660 the place the value is being stored, use a safe function when copying
3661 a value through a pointer into a structure value return block. */
3662 if (TREE_CODE (to) == RESULT_DECL && TREE_CODE (from) == INDIRECT_REF
3663 && current_function_returns_struct
3664 && !current_function_returns_pcc_struct)
3669 size = expr_size (from);
3670 from_rtx = expand_expr (from, NULL_RTX, VOIDmode,
3671 EXPAND_MEMORY_USE_DONT);
3673 /* Copy the rights of the bitmap. */
3674 if (current_function_check_memory_usage)
3675 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
3676 XEXP (to_rtx, 0), Pmode,
3677 XEXP (from_rtx, 0), Pmode,
3678 convert_to_mode (TYPE_MODE (sizetype),
3679 size, TREE_UNSIGNED (sizetype)),
3680 TYPE_MODE (sizetype));
3682 #ifdef TARGET_MEM_FUNCTIONS
3683 emit_library_call (memcpy_libfunc, 0,
3684 VOIDmode, 3, XEXP (to_rtx, 0), Pmode,
3685 XEXP (from_rtx, 0), Pmode,
3686 convert_to_mode (TYPE_MODE (sizetype),
3687 size, TREE_UNSIGNED (sizetype)),
3688 TYPE_MODE (sizetype));
3690 emit_library_call (bcopy_libfunc, 0,
3691 VOIDmode, 3, XEXP (from_rtx, 0), Pmode,
3692 XEXP (to_rtx, 0), Pmode,
3693 convert_to_mode (TYPE_MODE (integer_type_node),
3694 size, TREE_UNSIGNED (integer_type_node)),
3695 TYPE_MODE (integer_type_node));
3698 preserve_temp_slots (to_rtx);
3701 return want_value ? to_rtx : NULL_RTX;
3704 /* Compute FROM and store the value in the rtx we got. */
3707 result = store_expr (from, to_rtx, want_value);
3708 preserve_temp_slots (result);
3711 return want_value ? result : NULL_RTX;
3714 /* Generate code for computing expression EXP,
3715 and storing the value into TARGET.
3716 TARGET may contain a QUEUED rtx.
3718 If WANT_VALUE is nonzero, return a copy of the value
3719 not in TARGET, so that we can be sure to use the proper
3720 value in a containing expression even if TARGET has something
3721 else stored in it. If possible, we copy the value through a pseudo
3722 and return that pseudo. Or, if the value is constant, we try to
3723 return the constant. In some cases, we return a pseudo
3724 copied *from* TARGET.
3726 If the mode is BLKmode then we may return TARGET itself.
3727 It turns out that in BLKmode it doesn't cause a problem.
3728 because C has no operators that could combine two different
3729 assignments into the same BLKmode object with different values
3730 with no sequence point. Will other languages need this to
3733 If WANT_VALUE is 0, we return NULL, to make sure
3734 to catch quickly any cases where the caller uses the value
3735 and fails to set WANT_VALUE. */
3738 store_expr (exp, target, want_value)
3740 register rtx target;
3744 int dont_return_target = 0;
3746 if (TREE_CODE (exp) == COMPOUND_EXPR)
3748 /* Perform first part of compound expression, then assign from second
3750 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0);
3752 return store_expr (TREE_OPERAND (exp, 1), target, want_value);
3754 else if (TREE_CODE (exp) == COND_EXPR && GET_MODE (target) == BLKmode)
3756 /* For conditional expression, get safe form of the target. Then
3757 test the condition, doing the appropriate assignment on either
3758 side. This avoids the creation of unnecessary temporaries.
3759 For non-BLKmode, it is more efficient not to do this. */
3761 rtx lab1 = gen_label_rtx (), lab2 = gen_label_rtx ();
3764 target = protect_from_queue (target, 1);
3766 do_pending_stack_adjust ();
3768 jumpifnot (TREE_OPERAND (exp, 0), lab1);
3769 start_cleanup_deferral ();
3770 store_expr (TREE_OPERAND (exp, 1), target, 0);
3771 end_cleanup_deferral ();
3773 emit_jump_insn (gen_jump (lab2));
3776 start_cleanup_deferral ();
3777 store_expr (TREE_OPERAND (exp, 2), target, 0);
3778 end_cleanup_deferral ();
3783 return want_value ? target : NULL_RTX;
3785 else if (queued_subexp_p (target))
3786 /* If target contains a postincrement, let's not risk
3787 using it as the place to generate the rhs. */
3789 if (GET_MODE (target) != BLKmode && GET_MODE (target) != VOIDmode)
3791 /* Expand EXP into a new pseudo. */
3792 temp = gen_reg_rtx (GET_MODE (target));
3793 temp = expand_expr (exp, temp, GET_MODE (target), 0);
3796 temp = expand_expr (exp, NULL_RTX, GET_MODE (target), 0);
3798 /* If target is volatile, ANSI requires accessing the value
3799 *from* the target, if it is accessed. So make that happen.
3800 In no case return the target itself. */
3801 if (! MEM_VOLATILE_P (target) && want_value)
3802 dont_return_target = 1;
3804 else if (want_value && GET_CODE (target) == MEM && ! MEM_VOLATILE_P (target)
3805 && GET_MODE (target) != BLKmode)
3806 /* If target is in memory and caller wants value in a register instead,
3807 arrange that. Pass TARGET as target for expand_expr so that,
3808 if EXP is another assignment, WANT_VALUE will be nonzero for it.
3809 We know expand_expr will not use the target in that case.
3810 Don't do this if TARGET is volatile because we are supposed
3811 to write it and then read it. */
3813 temp = expand_expr (exp, target, GET_MODE (target), 0);
3814 if (GET_MODE (temp) != BLKmode && GET_MODE (temp) != VOIDmode)
3815 temp = copy_to_reg (temp);
3816 dont_return_target = 1;
3818 else if (GET_CODE (target) == SUBREG && SUBREG_PROMOTED_VAR_P (target))
3819 /* If this is an scalar in a register that is stored in a wider mode
3820 than the declared mode, compute the result into its declared mode
3821 and then convert to the wider mode. Our value is the computed
3824 /* If we don't want a value, we can do the conversion inside EXP,
3825 which will often result in some optimizations. Do the conversion
3826 in two steps: first change the signedness, if needed, then
3827 the extend. But don't do this if the type of EXP is a subtype
3828 of something else since then the conversion might involve
3829 more than just converting modes. */
3830 if (! want_value && INTEGRAL_TYPE_P (TREE_TYPE (exp))
3831 && TREE_TYPE (TREE_TYPE (exp)) == 0)
3833 if (TREE_UNSIGNED (TREE_TYPE (exp))
3834 != SUBREG_PROMOTED_UNSIGNED_P (target))
3837 (signed_or_unsigned_type (SUBREG_PROMOTED_UNSIGNED_P (target),
3841 exp = convert (type_for_mode (GET_MODE (SUBREG_REG (target)),
3842 SUBREG_PROMOTED_UNSIGNED_P (target)),
3846 temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);
3848 /* If TEMP is a volatile MEM and we want a result value, make
3849 the access now so it gets done only once. Likewise if
3850 it contains TARGET. */
3851 if (GET_CODE (temp) == MEM && want_value
3852 && (MEM_VOLATILE_P (temp)
3853 || reg_mentioned_p (SUBREG_REG (target), XEXP (temp, 0))))
3854 temp = copy_to_reg (temp);
3856 /* If TEMP is a VOIDmode constant, use convert_modes to make
3857 sure that we properly convert it. */
3858 if (CONSTANT_P (temp) && GET_MODE (temp) == VOIDmode)
3859 temp = convert_modes (GET_MODE (SUBREG_REG (target)),
3860 TYPE_MODE (TREE_TYPE (exp)), temp,
3861 SUBREG_PROMOTED_UNSIGNED_P (target));
3863 convert_move (SUBREG_REG (target), temp,
3864 SUBREG_PROMOTED_UNSIGNED_P (target));
3866 /* If we promoted a constant, change the mode back down to match
3867 target. Otherwise, the caller might get confused by a result whose
3868 mode is larger than expected. */
3870 if (want_value && GET_MODE (temp) != GET_MODE (target)
3871 && GET_MODE (temp) != VOIDmode)
3873 temp = gen_rtx_SUBREG (GET_MODE (target), temp, 0);
3874 SUBREG_PROMOTED_VAR_P (temp) = 1;
3875 SUBREG_PROMOTED_UNSIGNED_P (temp)
3876 = SUBREG_PROMOTED_UNSIGNED_P (target);
3879 return want_value ? temp : NULL_RTX;
3883 temp = expand_expr (exp, target, GET_MODE (target), 0);
3884 /* Return TARGET if it's a specified hardware register.
3885 If TARGET is a volatile mem ref, either return TARGET
3886 or return a reg copied *from* TARGET; ANSI requires this.
3888 Otherwise, if TEMP is not TARGET, return TEMP
3889 if it is constant (for efficiency),
3890 or if we really want the correct value. */
3891 if (!(target && GET_CODE (target) == REG
3892 && REGNO (target) < FIRST_PSEUDO_REGISTER)
3893 && !(GET_CODE (target) == MEM && MEM_VOLATILE_P (target))
3894 && ! rtx_equal_p (temp, target)
3895 && (CONSTANT_P (temp) || want_value))
3896 dont_return_target = 1;
3899 /* If TEMP is a VOIDmode constant and the mode of the type of EXP is not
3900 the same as that of TARGET, adjust the constant. This is needed, for
3901 example, in case it is a CONST_DOUBLE and we want only a word-sized
3903 if (CONSTANT_P (temp) && GET_MODE (temp) == VOIDmode
3904 && TREE_CODE (exp) != ERROR_MARK
3905 && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp)))
3906 temp = convert_modes (GET_MODE (target), TYPE_MODE (TREE_TYPE (exp)),
3907 temp, TREE_UNSIGNED (TREE_TYPE (exp)));
3909 if (current_function_check_memory_usage
3910 && GET_CODE (target) == MEM
3911 && AGGREGATE_TYPE_P (TREE_TYPE (exp)))
3913 in_check_memory_usage = 1;
3914 if (GET_CODE (temp) == MEM)
3915 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
3916 XEXP (target, 0), Pmode,
3917 XEXP (temp, 0), Pmode,
3918 expr_size (exp), TYPE_MODE (sizetype));
3920 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
3921 XEXP (target, 0), Pmode,
3922 expr_size (exp), TYPE_MODE (sizetype),
3923 GEN_INT (MEMORY_USE_WO),
3924 TYPE_MODE (integer_type_node));
3925 in_check_memory_usage = 0;
3928 /* If value was not generated in the target, store it there.
3929 Convert the value to TARGET's type first if nec. */
3930 /* If TEMP and TARGET compare equal according to rtx_equal_p, but
3931 one or both of them are volatile memory refs, we have to distinguish
3933 - expand_expr has used TARGET. In this case, we must not generate
3934 another copy. This can be detected by TARGET being equal according
3936 - expand_expr has not used TARGET - that means that the source just
3937 happens to have the same RTX form. Since temp will have been created
3938 by expand_expr, it will compare unequal according to == .
3939 We must generate a copy in this case, to reach the correct number
3940 of volatile memory references. */
3942 if ((! rtx_equal_p (temp, target)
3943 || (temp != target && (side_effects_p (temp)
3944 || side_effects_p (target))))
3945 && TREE_CODE (exp) != ERROR_MARK)
3947 target = protect_from_queue (target, 1);
3948 if (GET_MODE (temp) != GET_MODE (target)
3949 && GET_MODE (temp) != VOIDmode)
3951 int unsignedp = TREE_UNSIGNED (TREE_TYPE (exp));
3952 if (dont_return_target)
3954 /* In this case, we will return TEMP,
3955 so make sure it has the proper mode.
3956 But don't forget to store the value into TARGET. */
3957 temp = convert_to_mode (GET_MODE (target), temp, unsignedp);
3958 emit_move_insn (target, temp);
3961 convert_move (target, temp, unsignedp);
3964 else if (GET_MODE (temp) == BLKmode && TREE_CODE (exp) == STRING_CST)
3966 /* Handle copying a string constant into an array.
3967 The string constant may be shorter than the array.
3968 So copy just the string's actual length, and clear the rest. */
3972 /* Get the size of the data type of the string,
3973 which is actually the size of the target. */
3974 size = expr_size (exp);
3975 if (GET_CODE (size) == CONST_INT
3976 && INTVAL (size) < TREE_STRING_LENGTH (exp))
3977 emit_block_move (target, temp, size, TYPE_ALIGN (TREE_TYPE (exp)));
3980 /* Compute the size of the data to copy from the string. */
3982 = size_binop (MIN_EXPR,
3983 make_tree (sizetype, size),
3984 size_int (TREE_STRING_LENGTH (exp)));
3985 unsigned int align = TYPE_ALIGN (TREE_TYPE (exp));
3986 rtx copy_size_rtx = expand_expr (copy_size, NULL_RTX,
3990 /* Copy that much. */
3991 emit_block_move (target, temp, copy_size_rtx,
3992 TYPE_ALIGN (TREE_TYPE (exp)));
3994 /* Figure out how much is left in TARGET that we have to clear.
3995 Do all calculations in ptr_mode. */
3997 addr = XEXP (target, 0);
3998 addr = convert_modes (ptr_mode, Pmode, addr, 1);
4000 if (GET_CODE (copy_size_rtx) == CONST_INT)
4002 addr = plus_constant (addr, TREE_STRING_LENGTH (exp));
4003 size = plus_constant (size, -TREE_STRING_LENGTH (exp));
4004 align = MIN (align, (BITS_PER_UNIT
4005 * (INTVAL (copy_size_rtx)
4006 & - INTVAL (copy_size_rtx))));
4010 addr = force_reg (ptr_mode, addr);
4011 addr = expand_binop (ptr_mode, add_optab, addr,
4012 copy_size_rtx, NULL_RTX, 0,
4015 size = expand_binop (ptr_mode, sub_optab, size,
4016 copy_size_rtx, NULL_RTX, 0,
4019 align = BITS_PER_UNIT;
4020 label = gen_label_rtx ();
4021 emit_cmp_and_jump_insns (size, const0_rtx, LT, NULL_RTX,
4022 GET_MODE (size), 0, 0, label);
4024 align = MIN (align, expr_align (copy_size));
4026 if (size != const0_rtx)
4028 rtx dest = gen_rtx_MEM (BLKmode, addr);
4030 MEM_COPY_ATTRIBUTES (dest, target);
4032 /* Be sure we can write on ADDR. */
4033 in_check_memory_usage = 1;
4034 if (current_function_check_memory_usage)
4035 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
4037 size, TYPE_MODE (sizetype),
4038 GEN_INT (MEMORY_USE_WO),
4039 TYPE_MODE (integer_type_node));
4040 in_check_memory_usage = 0;
4041 clear_storage (dest, size, align);
4048 /* Handle calls that return values in multiple non-contiguous locations.
4049 The Irix 6 ABI has examples of this. */
4050 else if (GET_CODE (target) == PARALLEL)
4051 emit_group_load (target, temp, int_size_in_bytes (TREE_TYPE (exp)),
4052 TYPE_ALIGN (TREE_TYPE (exp)));
4053 else if (GET_MODE (temp) == BLKmode)
4054 emit_block_move (target, temp, expr_size (exp),
4055 TYPE_ALIGN (TREE_TYPE (exp)));
4057 emit_move_insn (target, temp);
4060 /* If we don't want a value, return NULL_RTX. */
4064 /* If we are supposed to return TEMP, do so as long as it isn't a MEM.
4065 ??? The latter test doesn't seem to make sense. */
4066 else if (dont_return_target && GET_CODE (temp) != MEM)
4069 /* Return TARGET itself if it is a hard register. */
4070 else if (want_value && GET_MODE (target) != BLKmode
4071 && ! (GET_CODE (target) == REG
4072 && REGNO (target) < FIRST_PSEUDO_REGISTER))
4073 return copy_to_reg (target);
4079 /* Return 1 if EXP just contains zeros. */
4087 switch (TREE_CODE (exp))
4091 case NON_LVALUE_EXPR:
4092 return is_zeros_p (TREE_OPERAND (exp, 0));
4095 return integer_zerop (exp);
4099 is_zeros_p (TREE_REALPART (exp)) && is_zeros_p (TREE_IMAGPART (exp));
4102 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (exp), dconst0);
4105 if (TREE_TYPE (exp) && TREE_CODE (TREE_TYPE (exp)) == SET_TYPE)
4106 return CONSTRUCTOR_ELTS (exp) == NULL_TREE;
4107 for (elt = CONSTRUCTOR_ELTS (exp); elt; elt = TREE_CHAIN (elt))
4108 if (! is_zeros_p (TREE_VALUE (elt)))
4118 /* Return 1 if EXP contains mostly (3/4) zeros. */
4121 mostly_zeros_p (exp)
4124 if (TREE_CODE (exp) == CONSTRUCTOR)
4126 int elts = 0, zeros = 0;
4127 tree elt = CONSTRUCTOR_ELTS (exp);
4128 if (TREE_TYPE (exp) && TREE_CODE (TREE_TYPE (exp)) == SET_TYPE)
4130 /* If there are no ranges of true bits, it is all zero. */
4131 return elt == NULL_TREE;
4133 for (; elt; elt = TREE_CHAIN (elt))
4135 /* We do not handle the case where the index is a RANGE_EXPR,
4136 so the statistic will be somewhat inaccurate.
4137 We do make a more accurate count in store_constructor itself,
4138 so since this function is only used for nested array elements,
4139 this should be close enough. */
4140 if (mostly_zeros_p (TREE_VALUE (elt)))
4145 return 4 * zeros >= 3 * elts;
4148 return is_zeros_p (exp);
4151 /* Helper function for store_constructor.
4152 TARGET, BITSIZE, BITPOS, MODE, EXP are as for store_field.
4153 TYPE is the type of the CONSTRUCTOR, not the element type.
4154 ALIGN and CLEARED are as for store_constructor.
4156 This provides a recursive shortcut back to store_constructor when it isn't
4157 necessary to go through store_field. This is so that we can pass through
4158 the cleared field to let store_constructor know that we may not have to
4159 clear a substructure if the outer structure has already been cleared. */
4162 store_constructor_field (target, bitsize, bitpos,
4163 mode, exp, type, align, cleared)
4165 unsigned HOST_WIDE_INT bitsize;
4166 HOST_WIDE_INT bitpos;
4167 enum machine_mode mode;
4172 if (TREE_CODE (exp) == CONSTRUCTOR
4173 && bitpos % BITS_PER_UNIT == 0
4174 /* If we have a non-zero bitpos for a register target, then we just
4175 let store_field do the bitfield handling. This is unlikely to
4176 generate unnecessary clear instructions anyways. */
4177 && (bitpos == 0 || GET_CODE (target) == MEM))
4181 = change_address (target,
4182 GET_MODE (target) == BLKmode
4184 % GET_MODE_ALIGNMENT (GET_MODE (target)))
4185 ? BLKmode : VOIDmode,
4186 plus_constant (XEXP (target, 0),
4187 bitpos / BITS_PER_UNIT));
4188 store_constructor (exp, target, align, cleared, bitsize / BITS_PER_UNIT);
4191 store_field (target, bitsize, bitpos, mode, exp, VOIDmode, 0, align,
4192 int_size_in_bytes (type), 0);
4195 /* Store the value of constructor EXP into the rtx TARGET.
4196 TARGET is either a REG or a MEM.
4197 ALIGN is the maximum known alignment for TARGET.
4198 CLEARED is true if TARGET is known to have been zero'd.
4199 SIZE is the number of bytes of TARGET we are allowed to modify: this
4200 may not be the same as the size of EXP if we are assigning to a field
4201 which has been packed to exclude padding bits. */
4204 store_constructor (exp, target, align, cleared, size)
4211 tree type = TREE_TYPE (exp);
4212 #ifdef WORD_REGISTER_OPERATIONS
4213 HOST_WIDE_INT exp_size = int_size_in_bytes (type);
4216 /* We know our target cannot conflict, since safe_from_p has been called. */
4218 /* Don't try copying piece by piece into a hard register
4219 since that is vulnerable to being clobbered by EXP.
4220 Instead, construct in a pseudo register and then copy it all. */
4221 if (GET_CODE (target) == REG && REGNO (target) < FIRST_PSEUDO_REGISTER)
4223 rtx temp = gen_reg_rtx (GET_MODE (target));
4224 store_constructor (exp, temp, align, cleared, size);
4225 emit_move_insn (target, temp);
4230 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4231 || TREE_CODE (type) == QUAL_UNION_TYPE)
4235 /* Inform later passes that the whole union value is dead. */
4236 if ((TREE_CODE (type) == UNION_TYPE
4237 || TREE_CODE (type) == QUAL_UNION_TYPE)
4240 emit_insn (gen_rtx_CLOBBER (VOIDmode, target));
4242 /* If the constructor is empty, clear the union. */
4243 if (! CONSTRUCTOR_ELTS (exp) && ! cleared)
4244 clear_storage (target, expr_size (exp), TYPE_ALIGN (type));
4247 /* If we are building a static constructor into a register,
4248 set the initial value as zero so we can fold the value into
4249 a constant. But if more than one register is involved,
4250 this probably loses. */
4251 else if (GET_CODE (target) == REG && TREE_STATIC (exp)
4252 && GET_MODE_SIZE (GET_MODE (target)) <= UNITS_PER_WORD)
4255 emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
4260 /* If the constructor has fewer fields than the structure
4261 or if we are initializing the structure to mostly zeros,
4262 clear the whole structure first. */
4264 && ((list_length (CONSTRUCTOR_ELTS (exp))
4265 != fields_length (type))
4266 || mostly_zeros_p (exp)))
4269 clear_storage (target, GEN_INT (size), align);
4274 /* Inform later passes that the old value is dead. */
4275 emit_insn (gen_rtx_CLOBBER (VOIDmode, target));
4277 /* Store each element of the constructor into
4278 the corresponding field of TARGET. */
4280 for (elt = CONSTRUCTOR_ELTS (exp); elt; elt = TREE_CHAIN (elt))
4282 register tree field = TREE_PURPOSE (elt);
4283 #ifdef WORD_REGISTER_OPERATIONS
4284 tree value = TREE_VALUE (elt);
4286 register enum machine_mode mode;
4287 HOST_WIDE_INT bitsize;
4288 HOST_WIDE_INT bitpos = 0;
4291 rtx to_rtx = target;
4293 /* Just ignore missing fields.
4294 We cleared the whole structure, above,
4295 if any fields are missing. */
4299 if (cleared && is_zeros_p (TREE_VALUE (elt)))
4302 if (host_integerp (DECL_SIZE (field), 1))
4303 bitsize = tree_low_cst (DECL_SIZE (field), 1);
4307 unsignedp = TREE_UNSIGNED (field);
4308 mode = DECL_MODE (field);
4309 if (DECL_BIT_FIELD (field))
4312 offset = DECL_FIELD_OFFSET (field);
4313 if (host_integerp (offset, 0)
4314 && host_integerp (bit_position (field), 0))
4316 bitpos = int_bit_position (field);
4320 bitpos = tree_low_cst (DECL_FIELD_BIT_OFFSET (field), 0);
4326 if (contains_placeholder_p (offset))
4327 offset = build (WITH_RECORD_EXPR, sizetype,
4328 offset, make_tree (TREE_TYPE (exp), target));
4330 offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, 0);
4331 if (GET_CODE (to_rtx) != MEM)
4334 if (GET_MODE (offset_rtx) != ptr_mode)
4336 #ifdef POINTERS_EXTEND_UNSIGNED
4337 offset_rtx = convert_memory_address (ptr_mode, offset_rtx);
4339 offset_rtx = convert_to_mode (ptr_mode, offset_rtx, 0);
4344 = change_address (to_rtx, VOIDmode,
4345 gen_rtx_PLUS (ptr_mode, XEXP (to_rtx, 0),
4346 force_reg (ptr_mode,
4348 align = DECL_OFFSET_ALIGN (field);
4351 if (TREE_READONLY (field))
4353 if (GET_CODE (to_rtx) == MEM)
4354 to_rtx = copy_rtx (to_rtx);
4356 RTX_UNCHANGING_P (to_rtx) = 1;
4359 #ifdef WORD_REGISTER_OPERATIONS
4360 /* If this initializes a field that is smaller than a word, at the
4361 start of a word, try to widen it to a full word.
4362 This special case allows us to output C++ member function
4363 initializations in a form that the optimizers can understand. */
4364 if (GET_CODE (target) == REG
4365 && bitsize < BITS_PER_WORD
4366 && bitpos % BITS_PER_WORD == 0
4367 && GET_MODE_CLASS (mode) == MODE_INT
4368 && TREE_CODE (value) == INTEGER_CST
4370 && bitpos + BITS_PER_WORD <= exp_size * BITS_PER_UNIT)
4372 tree type = TREE_TYPE (value);
4373 if (TYPE_PRECISION (type) < BITS_PER_WORD)
4375 type = type_for_size (BITS_PER_WORD, TREE_UNSIGNED (type));
4376 value = convert (type, value);
4378 if (BYTES_BIG_ENDIAN)
4380 = fold (build (LSHIFT_EXPR, type, value,
4381 build_int_2 (BITS_PER_WORD - bitsize, 0)));
4382 bitsize = BITS_PER_WORD;
4386 store_constructor_field (to_rtx, bitsize, bitpos, mode,
4387 TREE_VALUE (elt), type, align, cleared);
4390 else if (TREE_CODE (type) == ARRAY_TYPE)
4395 tree domain = TYPE_DOMAIN (type);
4396 HOST_WIDE_INT minelt = TREE_INT_CST_LOW (TYPE_MIN_VALUE (domain));
4397 HOST_WIDE_INT maxelt = TREE_INT_CST_LOW (TYPE_MAX_VALUE (domain));
4398 tree elttype = TREE_TYPE (type);
4400 /* If the constructor has fewer elements than the array,
4401 clear the whole array first. Similarly if this is
4402 static constructor of a non-BLKmode object. */
4403 if (cleared || (GET_CODE (target) == REG && TREE_STATIC (exp)))
4407 HOST_WIDE_INT count = 0, zero_count = 0;
4409 /* This loop is a more accurate version of the loop in
4410 mostly_zeros_p (it handles RANGE_EXPR in an index).
4411 It is also needed to check for missing elements. */
4412 for (elt = CONSTRUCTOR_ELTS (exp);
4414 elt = TREE_CHAIN (elt))
4416 tree index = TREE_PURPOSE (elt);
4417 HOST_WIDE_INT this_node_count;
4419 if (index != NULL_TREE && TREE_CODE (index) == RANGE_EXPR)
4421 tree lo_index = TREE_OPERAND (index, 0);
4422 tree hi_index = TREE_OPERAND (index, 1);
4424 if (! host_integerp (lo_index, 1)
4425 || ! host_integerp (hi_index, 1))
4431 this_node_count = (tree_low_cst (hi_index, 1)
4432 - tree_low_cst (lo_index, 1) + 1);
4435 this_node_count = 1;
4436 count += this_node_count;
4437 if (mostly_zeros_p (TREE_VALUE (elt)))
4438 zero_count += this_node_count;
4440 /* Clear the entire array first if there are any missing elements,
4441 or if the incidence of zero elements is >= 75%. */
4442 if (count < maxelt - minelt + 1
4443 || 4 * zero_count >= 3 * count)
4446 if (need_to_clear && size > 0)
4449 clear_storage (target, GEN_INT (size), align);
4453 /* Inform later passes that the old value is dead. */
4454 emit_insn (gen_rtx_CLOBBER (VOIDmode, target));
4456 /* Store each element of the constructor into
4457 the corresponding element of TARGET, determined
4458 by counting the elements. */
4459 for (elt = CONSTRUCTOR_ELTS (exp), i = 0;
4461 elt = TREE_CHAIN (elt), i++)
4463 register enum machine_mode mode;
4464 HOST_WIDE_INT bitsize;
4465 HOST_WIDE_INT bitpos;
4467 tree value = TREE_VALUE (elt);
4468 unsigned int align = TYPE_ALIGN (TREE_TYPE (value));
4469 tree index = TREE_PURPOSE (elt);
4470 rtx xtarget = target;
4472 if (cleared && is_zeros_p (value))
4475 unsignedp = TREE_UNSIGNED (elttype);
4476 mode = TYPE_MODE (elttype);
4477 if (mode == BLKmode)
4478 bitsize = (host_integerp (TYPE_SIZE (elttype), 1)
4479 ? tree_low_cst (TYPE_SIZE (elttype), 1)
4482 bitsize = GET_MODE_BITSIZE (mode);
4484 if (index != NULL_TREE && TREE_CODE (index) == RANGE_EXPR)
4486 tree lo_index = TREE_OPERAND (index, 0);
4487 tree hi_index = TREE_OPERAND (index, 1);
4488 rtx index_r, pos_rtx, addr, hi_r, loop_top, loop_end;
4489 struct nesting *loop;
4490 HOST_WIDE_INT lo, hi, count;
4493 /* If the range is constant and "small", unroll the loop. */
4494 if (host_integerp (lo_index, 0)
4495 && host_integerp (hi_index, 0)
4496 && (lo = tree_low_cst (lo_index, 0),
4497 hi = tree_low_cst (hi_index, 0),
4498 count = hi - lo + 1,
4499 (GET_CODE (target) != MEM
4501 || (host_integerp (TYPE_SIZE (elttype), 1)
4502 && (tree_low_cst (TYPE_SIZE (elttype), 1) * count
4505 lo -= minelt; hi -= minelt;
4506 for (; lo <= hi; lo++)
4508 bitpos = lo * tree_low_cst (TYPE_SIZE (elttype), 0);
4509 store_constructor_field (target, bitsize, bitpos, mode,
4510 value, type, align, cleared);
4515 hi_r = expand_expr (hi_index, NULL_RTX, VOIDmode, 0);
4516 loop_top = gen_label_rtx ();
4517 loop_end = gen_label_rtx ();
4519 unsignedp = TREE_UNSIGNED (domain);
4521 index = build_decl (VAR_DECL, NULL_TREE, domain);
4523 DECL_RTL (index) = index_r
4524 = gen_reg_rtx (promote_mode (domain, DECL_MODE (index),
4527 if (TREE_CODE (value) == SAVE_EXPR
4528 && SAVE_EXPR_RTL (value) == 0)
4530 /* Make sure value gets expanded once before the
4532 expand_expr (value, const0_rtx, VOIDmode, 0);
4535 store_expr (lo_index, index_r, 0);
4536 loop = expand_start_loop (0);
4538 /* Assign value to element index. */
4540 = convert (ssizetype,
4541 fold (build (MINUS_EXPR, TREE_TYPE (index),
4542 index, TYPE_MIN_VALUE (domain))));
4543 position = size_binop (MULT_EXPR, position,
4545 TYPE_SIZE_UNIT (elttype)));
4547 pos_rtx = expand_expr (position, 0, VOIDmode, 0);
4548 addr = gen_rtx_PLUS (Pmode, XEXP (target, 0), pos_rtx);
4549 xtarget = change_address (target, mode, addr);
4550 if (TREE_CODE (value) == CONSTRUCTOR)
4551 store_constructor (value, xtarget, align, cleared,
4552 bitsize / BITS_PER_UNIT);
4554 store_expr (value, xtarget, 0);
4556 expand_exit_loop_if_false (loop,
4557 build (LT_EXPR, integer_type_node,
4560 expand_increment (build (PREINCREMENT_EXPR,
4562 index, integer_one_node), 0, 0);
4564 emit_label (loop_end);
4567 else if ((index != 0 && ! host_integerp (index, 0))
4568 || ! host_integerp (TYPE_SIZE (elttype), 1))
4574 index = ssize_int (1);
4577 index = convert (ssizetype,
4578 fold (build (MINUS_EXPR, index,
4579 TYPE_MIN_VALUE (domain))));
4581 position = size_binop (MULT_EXPR, index,
4583 TYPE_SIZE_UNIT (elttype)));
4584 pos_rtx = expand_expr (position, 0, VOIDmode, 0);
4585 addr = gen_rtx_PLUS (Pmode, XEXP (target, 0), pos_rtx);
4586 xtarget = change_address (target, mode, addr);
4587 store_expr (value, xtarget, 0);
4592 bitpos = ((tree_low_cst (index, 0) - minelt)
4593 * tree_low_cst (TYPE_SIZE (elttype), 1));
4595 bitpos = (i * tree_low_cst (TYPE_SIZE (elttype), 1));
4597 store_constructor_field (target, bitsize, bitpos, mode, value,
4598 type, align, cleared);
4603 /* Set constructor assignments. */
4604 else if (TREE_CODE (type) == SET_TYPE)
4606 tree elt = CONSTRUCTOR_ELTS (exp);
4607 unsigned HOST_WIDE_INT nbytes = int_size_in_bytes (type), nbits;
4608 tree domain = TYPE_DOMAIN (type);
4609 tree domain_min, domain_max, bitlength;
4611 /* The default implementation strategy is to extract the constant
4612 parts of the constructor, use that to initialize the target,
4613 and then "or" in whatever non-constant ranges we need in addition.
4615 If a large set is all zero or all ones, it is
4616 probably better to set it using memset (if available) or bzero.
4617 Also, if a large set has just a single range, it may also be
4618 better to first clear all the first clear the set (using
4619 bzero/memset), and set the bits we want. */
4621 /* Check for all zeros. */
4622 if (elt == NULL_TREE && size > 0)
4625 clear_storage (target, GEN_INT (size), TYPE_ALIGN (type));
4629 domain_min = convert (sizetype, TYPE_MIN_VALUE (domain));
4630 domain_max = convert (sizetype, TYPE_MAX_VALUE (domain));
4631 bitlength = size_binop (PLUS_EXPR,
4632 size_diffop (domain_max, domain_min),
4635 nbits = tree_low_cst (bitlength, 1);
4637 /* For "small" sets, or "medium-sized" (up to 32 bytes) sets that
4638 are "complicated" (more than one range), initialize (the
4639 constant parts) by copying from a constant. */
4640 if (GET_MODE (target) != BLKmode || nbits <= 2 * BITS_PER_WORD
4641 || (nbytes <= 32 && TREE_CHAIN (elt) != NULL_TREE))
4643 unsigned int set_word_size = TYPE_ALIGN (TREE_TYPE (exp));
4644 enum machine_mode mode = mode_for_size (set_word_size, MODE_INT, 1);
4645 char *bit_buffer = (char *) alloca (nbits);
4646 HOST_WIDE_INT word = 0;
4647 unsigned int bit_pos = 0;
4648 unsigned int ibit = 0;
4649 unsigned int offset = 0; /* In bytes from beginning of set. */
4651 elt = get_set_constructor_bits (exp, bit_buffer, nbits);
4654 if (bit_buffer[ibit])
4656 if (BYTES_BIG_ENDIAN)
4657 word |= (1 << (set_word_size - 1 - bit_pos));
4659 word |= 1 << bit_pos;
4663 if (bit_pos >= set_word_size || ibit == nbits)
4665 if (word != 0 || ! cleared)
4667 rtx datum = GEN_INT (word);
4670 /* The assumption here is that it is safe to use
4671 XEXP if the set is multi-word, but not if
4672 it's single-word. */
4673 if (GET_CODE (target) == MEM)
4675 to_rtx = plus_constant (XEXP (target, 0), offset);
4676 to_rtx = change_address (target, mode, to_rtx);
4678 else if (offset == 0)
4682 emit_move_insn (to_rtx, datum);
4689 offset += set_word_size / BITS_PER_UNIT;
4694 /* Don't bother clearing storage if the set is all ones. */
4695 if (TREE_CHAIN (elt) != NULL_TREE
4696 || (TREE_PURPOSE (elt) == NULL_TREE
4698 : ( ! host_integerp (TREE_VALUE (elt), 0)
4699 || ! host_integerp (TREE_PURPOSE (elt), 0)
4700 || (tree_low_cst (TREE_VALUE (elt), 0)
4701 - tree_low_cst (TREE_PURPOSE (elt), 0) + 1
4702 != (HOST_WIDE_INT) nbits))))
4703 clear_storage (target, expr_size (exp), TYPE_ALIGN (type));
4705 for (; elt != NULL_TREE; elt = TREE_CHAIN (elt))
4707 /* Start of range of element or NULL. */
4708 tree startbit = TREE_PURPOSE (elt);
4709 /* End of range of element, or element value. */
4710 tree endbit = TREE_VALUE (elt);
4711 #ifdef TARGET_MEM_FUNCTIONS
4712 HOST_WIDE_INT startb, endb;
4714 rtx bitlength_rtx, startbit_rtx, endbit_rtx, targetx;
4716 bitlength_rtx = expand_expr (bitlength,
4717 NULL_RTX, MEM, EXPAND_CONST_ADDRESS);
4719 /* Handle non-range tuple element like [ expr ]. */
4720 if (startbit == NULL_TREE)
4722 startbit = save_expr (endbit);
4726 startbit = convert (sizetype, startbit);
4727 endbit = convert (sizetype, endbit);
4728 if (! integer_zerop (domain_min))
4730 startbit = size_binop (MINUS_EXPR, startbit, domain_min);
4731 endbit = size_binop (MINUS_EXPR, endbit, domain_min);
4733 startbit_rtx = expand_expr (startbit, NULL_RTX, MEM,
4734 EXPAND_CONST_ADDRESS);
4735 endbit_rtx = expand_expr (endbit, NULL_RTX, MEM,
4736 EXPAND_CONST_ADDRESS);
4740 targetx = assign_stack_temp (GET_MODE (target),
4741 GET_MODE_SIZE (GET_MODE (target)),
4743 emit_move_insn (targetx, target);
4746 else if (GET_CODE (target) == MEM)
4751 #ifdef TARGET_MEM_FUNCTIONS
4752 /* Optimization: If startbit and endbit are
4753 constants divisible by BITS_PER_UNIT,
4754 call memset instead. */
4755 if (TREE_CODE (startbit) == INTEGER_CST
4756 && TREE_CODE (endbit) == INTEGER_CST
4757 && (startb = TREE_INT_CST_LOW (startbit)) % BITS_PER_UNIT == 0
4758 && (endb = TREE_INT_CST_LOW (endbit) + 1) % BITS_PER_UNIT == 0)
4760 emit_library_call (memset_libfunc, 0,
4762 plus_constant (XEXP (targetx, 0),
4763 startb / BITS_PER_UNIT),
4765 constm1_rtx, TYPE_MODE (integer_type_node),
4766 GEN_INT ((endb - startb) / BITS_PER_UNIT),
4767 TYPE_MODE (sizetype));
4771 emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__setbits"),
4772 0, VOIDmode, 4, XEXP (targetx, 0), Pmode,
4773 bitlength_rtx, TYPE_MODE (sizetype),
4774 startbit_rtx, TYPE_MODE (sizetype),
4775 endbit_rtx, TYPE_MODE (sizetype));
4778 emit_move_insn (target, targetx);
4786 /* Store the value of EXP (an expression tree)
4787 into a subfield of TARGET which has mode MODE and occupies
4788 BITSIZE bits, starting BITPOS bits from the start of TARGET.
4789 If MODE is VOIDmode, it means that we are storing into a bit-field.
4791 If VALUE_MODE is VOIDmode, return nothing in particular.
4792 UNSIGNEDP is not used in this case.
4794 Otherwise, return an rtx for the value stored. This rtx
4795 has mode VALUE_MODE if that is convenient to do.
4796 In this case, UNSIGNEDP must be nonzero if the value is an unsigned type.
4798 ALIGN is the alignment that TARGET is known to have.
4799 TOTAL_SIZE is the size in bytes of the structure, or -1 if varying.
4801 ALIAS_SET is the alias set for the destination. This value will
4802 (in general) be different from that for TARGET, since TARGET is a
4803 reference to the containing structure. */
4806 store_field (target, bitsize, bitpos, mode, exp, value_mode,
4807 unsignedp, align, total_size, alias_set)
4809 HOST_WIDE_INT bitsize;
4810 HOST_WIDE_INT bitpos;
4811 enum machine_mode mode;
4813 enum machine_mode value_mode;
4816 HOST_WIDE_INT total_size;
4819 HOST_WIDE_INT width_mask = 0;
4821 if (TREE_CODE (exp) == ERROR_MARK)
4824 if (bitsize < HOST_BITS_PER_WIDE_INT)
4825 width_mask = ((HOST_WIDE_INT) 1 << bitsize) - 1;
4827 /* If we are storing into an unaligned field of an aligned union that is
4828 in a register, we may have the mode of TARGET being an integer mode but
4829 MODE == BLKmode. In that case, get an aligned object whose size and
4830 alignment are the same as TARGET and store TARGET into it (we can avoid
4831 the store if the field being stored is the entire width of TARGET). Then
4832 call ourselves recursively to store the field into a BLKmode version of
4833 that object. Finally, load from the object into TARGET. This is not
4834 very efficient in general, but should only be slightly more expensive
4835 than the otherwise-required unaligned accesses. Perhaps this can be
4836 cleaned up later. */
4839 && (GET_CODE (target) == REG || GET_CODE (target) == SUBREG))
4841 rtx object = assign_stack_temp (GET_MODE (target),
4842 GET_MODE_SIZE (GET_MODE (target)), 0);
4843 rtx blk_object = copy_rtx (object);
4845 MEM_SET_IN_STRUCT_P (object, 1);
4846 MEM_SET_IN_STRUCT_P (blk_object, 1);
4847 PUT_MODE (blk_object, BLKmode);
4849 if (bitsize != GET_MODE_BITSIZE (GET_MODE (target)))
4850 emit_move_insn (object, target);
4852 store_field (blk_object, bitsize, bitpos, mode, exp, VOIDmode, 0,
4853 align, total_size, alias_set);
4855 /* Even though we aren't returning target, we need to
4856 give it the updated value. */
4857 emit_move_insn (target, object);
4862 if (GET_CODE (target) == CONCAT)
4864 /* We're storing into a struct containing a single __complex. */
4868 return store_expr (exp, target, 0);
4871 /* If the structure is in a register or if the component
4872 is a bit field, we cannot use addressing to access it.
4873 Use bit-field techniques or SUBREG to store in it. */
4875 if (mode == VOIDmode
4876 || (mode != BLKmode && ! direct_store[(int) mode]
4877 && GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
4878 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT)
4879 || GET_CODE (target) == REG
4880 || GET_CODE (target) == SUBREG
4881 /* If the field isn't aligned enough to store as an ordinary memref,
4882 store it as a bit field. */
4883 || (mode != BLKmode && SLOW_UNALIGNED_ACCESS (mode, align)
4884 && (align < GET_MODE_ALIGNMENT (mode)
4885 || bitpos % GET_MODE_ALIGNMENT (mode)))
4886 || (mode == BLKmode && SLOW_UNALIGNED_ACCESS (mode, align)
4887 && (TYPE_ALIGN (TREE_TYPE (exp)) > align
4888 || bitpos % TYPE_ALIGN (TREE_TYPE (exp)) != 0))
4889 /* If the RHS and field are a constant size and the size of the
4890 RHS isn't the same size as the bitfield, we must use bitfield
4893 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) == INTEGER_CST
4894 && compare_tree_int (TYPE_SIZE (TREE_TYPE (exp)), bitsize) != 0))
4896 rtx temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);
4898 /* If BITSIZE is narrower than the size of the type of EXP
4899 we will be narrowing TEMP. Normally, what's wanted are the
4900 low-order bits. However, if EXP's type is a record and this is
4901 big-endian machine, we want the upper BITSIZE bits. */
4902 if (BYTES_BIG_ENDIAN && GET_MODE_CLASS (GET_MODE (temp)) == MODE_INT
4903 && bitsize < GET_MODE_BITSIZE (GET_MODE (temp))
4904 && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE)
4905 temp = expand_shift (RSHIFT_EXPR, GET_MODE (temp), temp,
4906 size_int (GET_MODE_BITSIZE (GET_MODE (temp))
4910 /* Unless MODE is VOIDmode or BLKmode, convert TEMP to
4912 if (mode != VOIDmode && mode != BLKmode
4913 && mode != TYPE_MODE (TREE_TYPE (exp)))
4914 temp = convert_modes (mode, TYPE_MODE (TREE_TYPE (exp)), temp, 1);
4916 /* If the modes of TARGET and TEMP are both BLKmode, both
4917 must be in memory and BITPOS must be aligned on a byte
4918 boundary. If so, we simply do a block copy. */
4919 if (GET_MODE (target) == BLKmode && GET_MODE (temp) == BLKmode)
4921 unsigned int exp_align = expr_align (exp);
4923 if (GET_CODE (target) != MEM || GET_CODE (temp) != MEM
4924 || bitpos % BITS_PER_UNIT != 0)
4927 target = change_address (target, VOIDmode,
4928 plus_constant (XEXP (target, 0),
4929 bitpos / BITS_PER_UNIT));
4931 /* Make sure that ALIGN is no stricter than the alignment of EXP. */
4932 align = MIN (exp_align, align);
4934 /* Find an alignment that is consistent with the bit position. */
4935 while ((bitpos % align) != 0)
4938 emit_block_move (target, temp,
4939 GEN_INT ((bitsize + BITS_PER_UNIT - 1)
4943 return value_mode == VOIDmode ? const0_rtx : target;
4946 /* Store the value in the bitfield. */
4947 store_bit_field (target, bitsize, bitpos, mode, temp, align, total_size);
4948 if (value_mode != VOIDmode)
4950 /* The caller wants an rtx for the value. */
4951 /* If possible, avoid refetching from the bitfield itself. */
4953 && ! (GET_CODE (target) == MEM && MEM_VOLATILE_P (target)))
4956 enum machine_mode tmode;
4959 return expand_and (temp, GEN_INT (width_mask), NULL_RTX);
4960 tmode = GET_MODE (temp);
4961 if (tmode == VOIDmode)
4963 count = build_int_2 (GET_MODE_BITSIZE (tmode) - bitsize, 0);
4964 temp = expand_shift (LSHIFT_EXPR, tmode, temp, count, 0, 0);
4965 return expand_shift (RSHIFT_EXPR, tmode, temp, count, 0, 0);
4967 return extract_bit_field (target, bitsize, bitpos, unsignedp,
4968 NULL_RTX, value_mode, 0, align,
4975 rtx addr = XEXP (target, 0);
4978 /* If a value is wanted, it must be the lhs;
4979 so make the address stable for multiple use. */
4981 if (value_mode != VOIDmode && GET_CODE (addr) != REG
4982 && ! CONSTANT_ADDRESS_P (addr)
4983 /* A frame-pointer reference is already stable. */
4984 && ! (GET_CODE (addr) == PLUS
4985 && GET_CODE (XEXP (addr, 1)) == CONST_INT
4986 && (XEXP (addr, 0) == virtual_incoming_args_rtx
4987 || XEXP (addr, 0) == virtual_stack_vars_rtx)))
4988 addr = copy_to_reg (addr);
4990 /* Now build a reference to just the desired component. */
4992 to_rtx = copy_rtx (change_address (target, mode,
4993 plus_constant (addr,
4995 / BITS_PER_UNIT))));
4996 MEM_SET_IN_STRUCT_P (to_rtx, 1);
4997 MEM_ALIAS_SET (to_rtx) = alias_set;
4999 return store_expr (exp, to_rtx, value_mode != VOIDmode);
5003 /* Given an expression EXP that may be a COMPONENT_REF, a BIT_FIELD_REF,
5004 or an ARRAY_REF, look for nested COMPONENT_REFs, BIT_FIELD_REFs, or
5005 ARRAY_REFs and find the ultimate containing object, which we return.
5007 We set *PBITSIZE to the size in bits that we want, *PBITPOS to the
5008 bit position, and *PUNSIGNEDP to the signedness of the field.
5009 If the position of the field is variable, we store a tree
5010 giving the variable offset (in units) in *POFFSET.
5011 This offset is in addition to the bit position.
5012 If the position is not variable, we store 0 in *POFFSET.
5013 We set *PALIGNMENT to the alignment of the address that will be
5014 computed. This is the alignment of the thing we return if *POFFSET
5015 is zero, but can be more less strictly aligned if *POFFSET is nonzero.
5017 If any of the extraction expressions is volatile,
5018 we store 1 in *PVOLATILEP. Otherwise we don't change that.
5020 If the field is a bit-field, *PMODE is set to VOIDmode. Otherwise, it
5021 is a mode that can be used to access the field. In that case, *PBITSIZE
5024 If the field describes a variable-sized object, *PMODE is set to
5025 VOIDmode and *PBITSIZE is set to -1. An access cannot be made in
5026 this case, but the address of the object can be found. */
5029 get_inner_reference (exp, pbitsize, pbitpos, poffset, pmode,
5030 punsignedp, pvolatilep, palignment)
5032 HOST_WIDE_INT *pbitsize;
5033 HOST_WIDE_INT *pbitpos;
5035 enum machine_mode *pmode;
5038 unsigned int *palignment;
5041 enum machine_mode mode = VOIDmode;
5042 tree offset = size_zero_node;
5043 tree bit_offset = bitsize_zero_node;
5044 unsigned int alignment = BIGGEST_ALIGNMENT;
5047 /* First get the mode, signedness, and size. We do this from just the
5048 outermost expression. */
5049 if (TREE_CODE (exp) == COMPONENT_REF)
5051 size_tree = DECL_SIZE (TREE_OPERAND (exp, 1));
5052 if (! DECL_BIT_FIELD (TREE_OPERAND (exp, 1)))
5053 mode = DECL_MODE (TREE_OPERAND (exp, 1));
5055 *punsignedp = TREE_UNSIGNED (TREE_OPERAND (exp, 1));
5057 else if (TREE_CODE (exp) == BIT_FIELD_REF)
5059 size_tree = TREE_OPERAND (exp, 1);
5060 *punsignedp = TREE_UNSIGNED (exp);
5064 mode = TYPE_MODE (TREE_TYPE (exp));
5065 *punsignedp = TREE_UNSIGNED (TREE_TYPE (exp));
5067 if (mode == BLKmode)
5068 size_tree = TYPE_SIZE (TREE_TYPE (exp));
5070 *pbitsize = GET_MODE_BITSIZE (mode);
5075 if (! host_integerp (size_tree, 1))
5076 mode = BLKmode, *pbitsize = -1;
5078 *pbitsize = tree_low_cst (size_tree, 1);
5081 /* Compute cumulative bit-offset for nested component-refs and array-refs,
5082 and find the ultimate containing object. */
5085 if (TREE_CODE (exp) == BIT_FIELD_REF)
5086 bit_offset = size_binop (PLUS_EXPR, bit_offset, TREE_OPERAND (exp, 2));
5087 else if (TREE_CODE (exp) == COMPONENT_REF)
5089 tree field = TREE_OPERAND (exp, 1);
5090 tree this_offset = DECL_FIELD_OFFSET (field);
5092 /* If this field hasn't been filled in yet, don't go
5093 past it. This should only happen when folding expressions
5094 made during type construction. */
5095 if (this_offset == 0)
5097 else if (! TREE_CONSTANT (this_offset)
5098 && contains_placeholder_p (this_offset))
5099 this_offset = build (WITH_RECORD_EXPR, sizetype, this_offset, exp);
5101 offset = size_binop (PLUS_EXPR, offset, this_offset);
5102 bit_offset = size_binop (PLUS_EXPR, bit_offset,
5103 DECL_FIELD_BIT_OFFSET (field));
5105 if (! host_integerp (offset, 0))
5106 alignment = MIN (alignment, DECL_OFFSET_ALIGN (field));
5109 else if (TREE_CODE (exp) == ARRAY_REF)
5111 tree index = TREE_OPERAND (exp, 1);
5112 tree domain = TYPE_DOMAIN (TREE_TYPE (TREE_OPERAND (exp, 0)));
5113 tree low_bound = (domain ? TYPE_MIN_VALUE (domain) : 0);
5114 tree unit_size = TYPE_SIZE_UNIT (TREE_TYPE (exp));
5116 /* We assume all arrays have sizes that are a multiple of a byte.
5117 First subtract the lower bound, if any, in the type of the
5118 index, then convert to sizetype and multiply by the size of the
5120 if (low_bound != 0 && ! integer_zerop (low_bound))
5121 index = fold (build (MINUS_EXPR, TREE_TYPE (index),
5124 /* If the index has a self-referential type, pass it to a
5125 WITH_RECORD_EXPR; if the component size is, pass our
5126 component to one. */
5127 if (! TREE_CONSTANT (index)
5128 && contains_placeholder_p (index))
5129 index = build (WITH_RECORD_EXPR, TREE_TYPE (index), index, exp);
5130 if (! TREE_CONSTANT (unit_size)
5131 && contains_placeholder_p (unit_size))
5132 unit_size = build (WITH_RECORD_EXPR, sizetype, unit_size,
5133 TREE_OPERAND (exp, 0));
5135 offset = size_binop (PLUS_EXPR, offset,
5136 size_binop (MULT_EXPR,
5137 convert (sizetype, index),
5141 else if (TREE_CODE (exp) != NON_LVALUE_EXPR
5142 && ! ((TREE_CODE (exp) == NOP_EXPR
5143 || TREE_CODE (exp) == CONVERT_EXPR)
5144 && (TYPE_MODE (TREE_TYPE (exp))
5145 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))))
5148 /* If any reference in the chain is volatile, the effect is volatile. */
5149 if (TREE_THIS_VOLATILE (exp))
5152 /* If the offset is non-constant already, then we can't assume any
5153 alignment more than the alignment here. */
5154 if (! TREE_CONSTANT (offset))
5155 alignment = MIN (alignment, TYPE_ALIGN (TREE_TYPE (exp)));
5157 exp = TREE_OPERAND (exp, 0);
5161 alignment = MIN (alignment, DECL_ALIGN (exp));
5162 else if (TREE_TYPE (exp) != 0)
5163 alignment = MIN (alignment, TYPE_ALIGN (TREE_TYPE (exp)));
5165 /* If OFFSET is constant, see if we can return the whole thing as a
5166 constant bit position. Otherwise, split it up. */
5167 if (host_integerp (offset, 0)
5168 && 0 != (tem = size_binop (MULT_EXPR, convert (bitsizetype, offset),
5170 && 0 != (tem = size_binop (PLUS_EXPR, tem, bit_offset))
5171 && host_integerp (tem, 0))
5172 *pbitpos = tree_low_cst (tem, 0), *poffset = 0;
5174 *pbitpos = tree_low_cst (bit_offset, 0), *poffset = offset;
5177 *palignment = alignment;
5181 /* Subroutine of expand_exp: compute memory_usage from modifier. */
5183 static enum memory_use_mode
5184 get_memory_usage_from_modifier (modifier)
5185 enum expand_modifier modifier;
5191 return MEMORY_USE_RO;
5193 case EXPAND_MEMORY_USE_WO:
5194 return MEMORY_USE_WO;
5196 case EXPAND_MEMORY_USE_RW:
5197 return MEMORY_USE_RW;
5199 case EXPAND_MEMORY_USE_DONT:
5200 /* EXPAND_CONST_ADDRESS and EXPAND_INITIALIZER are converted into
5201 MEMORY_USE_DONT, because they are modifiers to a call of
5202 expand_expr in the ADDR_EXPR case of expand_expr. */
5203 case EXPAND_CONST_ADDRESS:
5204 case EXPAND_INITIALIZER:
5205 return MEMORY_USE_DONT;
5206 case EXPAND_MEMORY_USE_BAD:
5212 /* Given an rtx VALUE that may contain additions and multiplications,
5213 return an equivalent value that just refers to a register or memory.
5214 This is done by generating instructions to perform the arithmetic
5215 and returning a pseudo-register containing the value.
5217 The returned value may be a REG, SUBREG, MEM or constant. */
5220 force_operand (value, target)
5223 register optab binoptab = 0;
5224 /* Use a temporary to force order of execution of calls to
5228 /* Use subtarget as the target for operand 0 of a binary operation. */
5229 register rtx subtarget = get_subtarget (target);
5231 /* Check for a PIC address load. */
5233 && (GET_CODE (value) == PLUS || GET_CODE (value) == MINUS)
5234 && XEXP (value, 0) == pic_offset_table_rtx
5235 && (GET_CODE (XEXP (value, 1)) == SYMBOL_REF
5236 || GET_CODE (XEXP (value, 1)) == LABEL_REF
5237 || GET_CODE (XEXP (value, 1)) == CONST))
5240 subtarget = gen_reg_rtx (GET_MODE (value));
5241 emit_move_insn (subtarget, value);
5245 if (GET_CODE (value) == PLUS)
5246 binoptab = add_optab;
5247 else if (GET_CODE (value) == MINUS)
5248 binoptab = sub_optab;
5249 else if (GET_CODE (value) == MULT)
5251 op2 = XEXP (value, 1);
5252 if (!CONSTANT_P (op2)
5253 && !(GET_CODE (op2) == REG && op2 != subtarget))
5255 tmp = force_operand (XEXP (value, 0), subtarget);
5256 return expand_mult (GET_MODE (value), tmp,
5257 force_operand (op2, NULL_RTX),
5263 op2 = XEXP (value, 1);
5264 if (!CONSTANT_P (op2)
5265 && !(GET_CODE (op2) == REG && op2 != subtarget))
5267 if (binoptab == sub_optab && GET_CODE (op2) == CONST_INT)
5269 binoptab = add_optab;
5270 op2 = negate_rtx (GET_MODE (value), op2);
5273 /* Check for an addition with OP2 a constant integer and our first
5274 operand a PLUS of a virtual register and something else. In that
5275 case, we want to emit the sum of the virtual register and the
5276 constant first and then add the other value. This allows virtual
5277 register instantiation to simply modify the constant rather than
5278 creating another one around this addition. */
5279 if (binoptab == add_optab && GET_CODE (op2) == CONST_INT
5280 && GET_CODE (XEXP (value, 0)) == PLUS
5281 && GET_CODE (XEXP (XEXP (value, 0), 0)) == REG
5282 && REGNO (XEXP (XEXP (value, 0), 0)) >= FIRST_VIRTUAL_REGISTER
5283 && REGNO (XEXP (XEXP (value, 0), 0)) <= LAST_VIRTUAL_REGISTER)
5285 rtx temp = expand_binop (GET_MODE (value), binoptab,
5286 XEXP (XEXP (value, 0), 0), op2,
5287 subtarget, 0, OPTAB_LIB_WIDEN);
5288 return expand_binop (GET_MODE (value), binoptab, temp,
5289 force_operand (XEXP (XEXP (value, 0), 1), 0),
5290 target, 0, OPTAB_LIB_WIDEN);
5293 tmp = force_operand (XEXP (value, 0), subtarget);
5294 return expand_binop (GET_MODE (value), binoptab, tmp,
5295 force_operand (op2, NULL_RTX),
5296 target, 0, OPTAB_LIB_WIDEN);
5297 /* We give UNSIGNEDP = 0 to expand_binop
5298 because the only operations we are expanding here are signed ones. */
5303 /* Subroutine of expand_expr:
5304 save the non-copied parts (LIST) of an expr (LHS), and return a list
5305 which can restore these values to their previous values,
5306 should something modify their storage. */
5309 save_noncopied_parts (lhs, list)
5316 for (tail = list; tail; tail = TREE_CHAIN (tail))
5317 if (TREE_CODE (TREE_VALUE (tail)) == TREE_LIST)
5318 parts = chainon (parts, save_noncopied_parts (lhs, TREE_VALUE (tail)));
5321 tree part = TREE_VALUE (tail);
5322 tree part_type = TREE_TYPE (part);
5323 tree to_be_saved = build (COMPONENT_REF, part_type, lhs, part);
5324 rtx target = assign_temp (part_type, 0, 1, 1);
5325 if (! memory_address_p (TYPE_MODE (part_type), XEXP (target, 0)))
5326 target = change_address (target, TYPE_MODE (part_type), NULL_RTX);
5327 parts = tree_cons (to_be_saved,
5328 build (RTL_EXPR, part_type, NULL_TREE,
5331 store_expr (TREE_PURPOSE (parts), RTL_EXPR_RTL (TREE_VALUE (parts)), 0);
5336 /* Subroutine of expand_expr:
5337 record the non-copied parts (LIST) of an expr (LHS), and return a list
5338 which specifies the initial values of these parts. */
5341 init_noncopied_parts (lhs, list)
5348 for (tail = list; tail; tail = TREE_CHAIN (tail))
5349 if (TREE_CODE (TREE_VALUE (tail)) == TREE_LIST)
5350 parts = chainon (parts, init_noncopied_parts (lhs, TREE_VALUE (tail)));
5351 else if (TREE_PURPOSE (tail))
5353 tree part = TREE_VALUE (tail);
5354 tree part_type = TREE_TYPE (part);
5355 tree to_be_initialized = build (COMPONENT_REF, part_type, lhs, part);
5356 parts = tree_cons (TREE_PURPOSE (tail), to_be_initialized, parts);
5361 /* Subroutine of expand_expr: return nonzero iff there is no way that
5362 EXP can reference X, which is being modified. TOP_P is nonzero if this
5363 call is going to be used to determine whether we need a temporary
5364 for EXP, as opposed to a recursive call to this function.
5366 It is always safe for this routine to return zero since it merely
5367 searches for optimization opportunities. */
5370 safe_from_p (x, exp, top_p)
5377 static int save_expr_count;
5378 static int save_expr_size = 0;
5379 static tree *save_expr_rewritten;
5380 static tree save_expr_trees[256];
5383 /* If EXP has varying size, we MUST use a target since we currently
5384 have no way of allocating temporaries of variable size
5385 (except for arrays that have TYPE_ARRAY_MAX_SIZE set).
5386 So we assume here that something at a higher level has prevented a
5387 clash. This is somewhat bogus, but the best we can do. Only
5388 do this when X is BLKmode and when we are at the top level. */
5389 || (top_p && TREE_TYPE (exp) != 0 && COMPLETE_TYPE_P (TREE_TYPE (exp))
5390 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) != INTEGER_CST
5391 && (TREE_CODE (TREE_TYPE (exp)) != ARRAY_TYPE
5392 || TYPE_ARRAY_MAX_SIZE (TREE_TYPE (exp)) == NULL_TREE
5393 || TREE_CODE (TYPE_ARRAY_MAX_SIZE (TREE_TYPE (exp)))
5395 && GET_MODE (x) == BLKmode))
5398 if (top_p && save_expr_size == 0)
5402 save_expr_count = 0;
5403 save_expr_size = sizeof (save_expr_trees) / sizeof (save_expr_trees[0]);
5404 save_expr_rewritten = &save_expr_trees[0];
5406 rtn = safe_from_p (x, exp, 1);
5408 for (i = 0; i < save_expr_count; ++i)
5410 if (TREE_CODE (save_expr_trees[i]) != ERROR_MARK)
5412 TREE_SET_CODE (save_expr_trees[i], SAVE_EXPR);
5420 /* If this is a subreg of a hard register, declare it unsafe, otherwise,
5421 find the underlying pseudo. */
5422 if (GET_CODE (x) == SUBREG)
5425 if (GET_CODE (x) == REG && REGNO (x) < FIRST_PSEUDO_REGISTER)
5429 /* If X is a location in the outgoing argument area, it is always safe. */
5430 if (GET_CODE (x) == MEM
5431 && (XEXP (x, 0) == virtual_outgoing_args_rtx
5432 || (GET_CODE (XEXP (x, 0)) == PLUS
5433 && XEXP (XEXP (x, 0), 0) == virtual_outgoing_args_rtx)))
5436 switch (TREE_CODE_CLASS (TREE_CODE (exp)))
5439 exp_rtl = DECL_RTL (exp);
5446 if (TREE_CODE (exp) == TREE_LIST)
5447 return ((TREE_VALUE (exp) == 0
5448 || safe_from_p (x, TREE_VALUE (exp), 0))
5449 && (TREE_CHAIN (exp) == 0
5450 || safe_from_p (x, TREE_CHAIN (exp), 0)));
5451 else if (TREE_CODE (exp) == ERROR_MARK)
5452 return 1; /* An already-visited SAVE_EXPR? */
5457 return safe_from_p (x, TREE_OPERAND (exp, 0), 0);
5461 return (safe_from_p (x, TREE_OPERAND (exp, 0), 0)
5462 && safe_from_p (x, TREE_OPERAND (exp, 1), 0));
5466 /* Now do code-specific tests. EXP_RTL is set to any rtx we find in
5467 the expression. If it is set, we conflict iff we are that rtx or
5468 both are in memory. Otherwise, we check all operands of the
5469 expression recursively. */
5471 switch (TREE_CODE (exp))
5474 return (staticp (TREE_OPERAND (exp, 0))
5475 || safe_from_p (x, TREE_OPERAND (exp, 0), 0)
5476 || TREE_STATIC (exp));
5479 if (GET_CODE (x) == MEM)
5484 exp_rtl = CALL_EXPR_RTL (exp);
5487 /* Assume that the call will clobber all hard registers and
5489 if ((GET_CODE (x) == REG && REGNO (x) < FIRST_PSEUDO_REGISTER)
5490 || GET_CODE (x) == MEM)
5497 /* If a sequence exists, we would have to scan every instruction
5498 in the sequence to see if it was safe. This is probably not
5500 if (RTL_EXPR_SEQUENCE (exp))
5503 exp_rtl = RTL_EXPR_RTL (exp);
5506 case WITH_CLEANUP_EXPR:
5507 exp_rtl = RTL_EXPR_RTL (exp);
5510 case CLEANUP_POINT_EXPR:
5511 return safe_from_p (x, TREE_OPERAND (exp, 0), 0);
5514 exp_rtl = SAVE_EXPR_RTL (exp);
5518 /* This SAVE_EXPR might appear many times in the top-level
5519 safe_from_p() expression, and if it has a complex
5520 subexpression, examining it multiple times could result
5521 in a combinatorial explosion. E.g. on an Alpha
5522 running at least 200MHz, a Fortran test case compiled with
5523 optimization took about 28 minutes to compile -- even though
5524 it was only a few lines long, and the complicated line causing
5525 so much time to be spent in the earlier version of safe_from_p()
5526 had only 293 or so unique nodes.
5528 So, turn this SAVE_EXPR into an ERROR_MARK for now, but remember
5529 where it is so we can turn it back in the top-level safe_from_p()
5532 /* For now, don't bother re-sizing the array. */
5533 if (save_expr_count >= save_expr_size)
5535 save_expr_rewritten[save_expr_count++] = exp;
5537 nops = TREE_CODE_LENGTH (SAVE_EXPR);
5538 for (i = 0; i < nops; i++)
5540 tree operand = TREE_OPERAND (exp, i);
5541 if (operand == NULL_TREE)
5543 TREE_SET_CODE (exp, ERROR_MARK);
5544 if (!safe_from_p (x, operand, 0))
5546 TREE_SET_CODE (exp, SAVE_EXPR);
5548 TREE_SET_CODE (exp, ERROR_MARK);
5552 /* The only operand we look at is operand 1. The rest aren't
5553 part of the expression. */
5554 return safe_from_p (x, TREE_OPERAND (exp, 1), 0);
5556 case METHOD_CALL_EXPR:
5557 /* This takes a rtx argument, but shouldn't appear here. */
5564 /* If we have an rtx, we do not need to scan our operands. */
5568 nops = TREE_CODE_LENGTH (TREE_CODE (exp));
5569 for (i = 0; i < nops; i++)
5570 if (TREE_OPERAND (exp, i) != 0
5571 && ! safe_from_p (x, TREE_OPERAND (exp, i), 0))
5575 /* If we have an rtl, find any enclosed object. Then see if we conflict
5579 if (GET_CODE (exp_rtl) == SUBREG)
5581 exp_rtl = SUBREG_REG (exp_rtl);
5582 if (GET_CODE (exp_rtl) == REG
5583 && REGNO (exp_rtl) < FIRST_PSEUDO_REGISTER)
5587 /* If the rtl is X, then it is not safe. Otherwise, it is unless both
5588 are memory and EXP is not readonly. */
5589 return ! (rtx_equal_p (x, exp_rtl)
5590 || (GET_CODE (x) == MEM && GET_CODE (exp_rtl) == MEM
5591 && ! TREE_READONLY (exp)));
5594 /* If we reach here, it is safe. */
5598 /* Subroutine of expand_expr: return nonzero iff EXP is an
5599 expression whose type is statically determinable. */
5605 if (TREE_CODE (exp) == PARM_DECL
5606 || TREE_CODE (exp) == VAR_DECL
5607 || TREE_CODE (exp) == CALL_EXPR || TREE_CODE (exp) == TARGET_EXPR
5608 || TREE_CODE (exp) == COMPONENT_REF
5609 || TREE_CODE (exp) == ARRAY_REF)
5614 /* Subroutine of expand_expr: return rtx if EXP is a
5615 variable or parameter; else return 0. */
5622 switch (TREE_CODE (exp))
5626 return DECL_RTL (exp);
5632 #ifdef MAX_INTEGER_COMPUTATION_MODE
5634 check_max_integer_computation_mode (exp)
5637 enum tree_code code;
5638 enum machine_mode mode;
5640 /* Strip any NOPs that don't change the mode. */
5642 code = TREE_CODE (exp);
5644 /* We must allow conversions of constants to MAX_INTEGER_COMPUTATION_MODE. */
5645 if (code == NOP_EXPR
5646 && TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST)
5649 /* First check the type of the overall operation. We need only look at
5650 unary, binary and relational operations. */
5651 if (TREE_CODE_CLASS (code) == '1'
5652 || TREE_CODE_CLASS (code) == '2'
5653 || TREE_CODE_CLASS (code) == '<')
5655 mode = TYPE_MODE (TREE_TYPE (exp));
5656 if (GET_MODE_CLASS (mode) == MODE_INT
5657 && mode > MAX_INTEGER_COMPUTATION_MODE)
5658 fatal ("unsupported wide integer operation");
5661 /* Check operand of a unary op. */
5662 if (TREE_CODE_CLASS (code) == '1')
5664 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
5665 if (GET_MODE_CLASS (mode) == MODE_INT
5666 && mode > MAX_INTEGER_COMPUTATION_MODE)
5667 fatal ("unsupported wide integer operation");
5670 /* Check operands of a binary/comparison op. */
5671 if (TREE_CODE_CLASS (code) == '2' || TREE_CODE_CLASS (code) == '<')
5673 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
5674 if (GET_MODE_CLASS (mode) == MODE_INT
5675 && mode > MAX_INTEGER_COMPUTATION_MODE)
5676 fatal ("unsupported wide integer operation");
5678 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 1)));
5679 if (GET_MODE_CLASS (mode) == MODE_INT
5680 && mode > MAX_INTEGER_COMPUTATION_MODE)
5681 fatal ("unsupported wide integer operation");
5686 /* Utility function used by expand_expr to see if TYPE, a RECORD_TYPE,
5687 has any readonly fields. If any of the fields have types that
5688 contain readonly fields, return true as well. */
5691 readonly_fields_p (type)
5696 for (field = TYPE_FIELDS (type); field != 0; field = TREE_CHAIN (field))
5697 if (TREE_CODE (field) == FIELD_DECL
5698 && (TREE_READONLY (field)
5699 || (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
5700 && readonly_fields_p (TREE_TYPE (field)))))
5706 /* expand_expr: generate code for computing expression EXP.
5707 An rtx for the computed value is returned. The value is never null.
5708 In the case of a void EXP, const0_rtx is returned.
5710 The value may be stored in TARGET if TARGET is nonzero.
5711 TARGET is just a suggestion; callers must assume that
5712 the rtx returned may not be the same as TARGET.
5714 If TARGET is CONST0_RTX, it means that the value will be ignored.
5716 If TMODE is not VOIDmode, it suggests generating the
5717 result in mode TMODE. But this is done only when convenient.
5718 Otherwise, TMODE is ignored and the value generated in its natural mode.
5719 TMODE is just a suggestion; callers must assume that
5720 the rtx returned may not have mode TMODE.
5722 Note that TARGET may have neither TMODE nor MODE. In that case, it
5723 probably will not be used.
5725 If MODIFIER is EXPAND_SUM then when EXP is an addition
5726 we can return an rtx of the form (MULT (REG ...) (CONST_INT ...))
5727 or a nest of (PLUS ...) and (MINUS ...) where the terms are
5728 products as above, or REG or MEM, or constant.
5729 Ordinarily in such cases we would output mul or add instructions
5730 and then return a pseudo reg containing the sum.
5732 EXPAND_INITIALIZER is much like EXPAND_SUM except that
5733 it also marks a label as absolutely required (it can't be dead).
5734 It also makes a ZERO_EXTEND or SIGN_EXTEND instead of emitting extend insns.
5735 This is used for outputting expressions used in initializers.
5737 EXPAND_CONST_ADDRESS says that it is okay to return a MEM
5738 with a constant address even if that address is not normally legitimate.
5739 EXPAND_INITIALIZER and EXPAND_SUM also have this effect. */
5742 expand_expr (exp, target, tmode, modifier)
5745 enum machine_mode tmode;
5746 enum expand_modifier modifier;
5748 register rtx op0, op1, temp;
5749 tree type = TREE_TYPE (exp);
5750 int unsignedp = TREE_UNSIGNED (type);
5751 register enum machine_mode mode;
5752 register enum tree_code code = TREE_CODE (exp);
5754 rtx subtarget, original_target;
5757 /* Used by check-memory-usage to make modifier read only. */
5758 enum expand_modifier ro_modifier;
5760 /* Handle ERROR_MARK before anybody tries to access its type. */
5761 if (TREE_CODE (exp) == ERROR_MARK)
5763 op0 = CONST0_RTX (tmode);
5769 mode = TYPE_MODE (type);
5770 /* Use subtarget as the target for operand 0 of a binary operation. */
5771 subtarget = get_subtarget (target);
5772 original_target = target;
5773 ignore = (target == const0_rtx
5774 || ((code == NON_LVALUE_EXPR || code == NOP_EXPR
5775 || code == CONVERT_EXPR || code == REFERENCE_EXPR
5776 || code == COND_EXPR)
5777 && TREE_CODE (type) == VOID_TYPE));
5779 /* Make a read-only version of the modifier. */
5780 if (modifier == EXPAND_NORMAL || modifier == EXPAND_SUM
5781 || modifier == EXPAND_CONST_ADDRESS || modifier == EXPAND_INITIALIZER)
5782 ro_modifier = modifier;
5784 ro_modifier = EXPAND_NORMAL;
5786 /* If we are going to ignore this result, we need only do something
5787 if there is a side-effect somewhere in the expression. If there
5788 is, short-circuit the most common cases here. Note that we must
5789 not call expand_expr with anything but const0_rtx in case this
5790 is an initial expansion of a size that contains a PLACEHOLDER_EXPR. */
5794 if (! TREE_SIDE_EFFECTS (exp))
5797 /* Ensure we reference a volatile object even if value is ignored, but
5798 don't do this if all we are doing is taking its address. */
5799 if (TREE_THIS_VOLATILE (exp)
5800 && TREE_CODE (exp) != FUNCTION_DECL
5801 && mode != VOIDmode && mode != BLKmode
5802 && modifier != EXPAND_CONST_ADDRESS)
5804 temp = expand_expr (exp, NULL_RTX, VOIDmode, ro_modifier);
5805 if (GET_CODE (temp) == MEM)
5806 temp = copy_to_reg (temp);
5810 if (TREE_CODE_CLASS (code) == '1' || code == COMPONENT_REF
5811 || code == INDIRECT_REF || code == BUFFER_REF)
5812 return expand_expr (TREE_OPERAND (exp, 0), const0_rtx,
5813 VOIDmode, ro_modifier);
5814 else if (TREE_CODE_CLASS (code) == '2' || TREE_CODE_CLASS (code) == '<'
5815 || code == ARRAY_REF)
5817 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, ro_modifier);
5818 expand_expr (TREE_OPERAND (exp, 1), const0_rtx, VOIDmode, ro_modifier);
5821 else if ((code == TRUTH_ANDIF_EXPR || code == TRUTH_ORIF_EXPR)
5822 && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 1)))
5823 /* If the second operand has no side effects, just evaluate
5825 return expand_expr (TREE_OPERAND (exp, 0), const0_rtx,
5826 VOIDmode, ro_modifier);
5827 else if (code == BIT_FIELD_REF)
5829 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, ro_modifier);
5830 expand_expr (TREE_OPERAND (exp, 1), const0_rtx, VOIDmode, ro_modifier);
5831 expand_expr (TREE_OPERAND (exp, 2), const0_rtx, VOIDmode, ro_modifier);
5838 #ifdef MAX_INTEGER_COMPUTATION_MODE
5839 /* Only check stuff here if the mode we want is different from the mode
5840 of the expression; if it's the same, check_max_integer_computiation_mode
5841 will handle it. Do we really need to check this stuff at all? */
5844 && GET_MODE (target) != mode
5845 && TREE_CODE (exp) != INTEGER_CST
5846 && TREE_CODE (exp) != PARM_DECL
5847 && TREE_CODE (exp) != ARRAY_REF
5848 && TREE_CODE (exp) != COMPONENT_REF
5849 && TREE_CODE (exp) != BIT_FIELD_REF
5850 && TREE_CODE (exp) != INDIRECT_REF
5851 && TREE_CODE (exp) != CALL_EXPR
5852 && TREE_CODE (exp) != VAR_DECL
5853 && TREE_CODE (exp) != RTL_EXPR)
5855 enum machine_mode mode = GET_MODE (target);
5857 if (GET_MODE_CLASS (mode) == MODE_INT
5858 && mode > MAX_INTEGER_COMPUTATION_MODE)
5859 fatal ("unsupported wide integer operation");
5863 && TREE_CODE (exp) != INTEGER_CST
5864 && TREE_CODE (exp) != PARM_DECL
5865 && TREE_CODE (exp) != ARRAY_REF
5866 && TREE_CODE (exp) != COMPONENT_REF
5867 && TREE_CODE (exp) != BIT_FIELD_REF
5868 && TREE_CODE (exp) != INDIRECT_REF
5869 && TREE_CODE (exp) != VAR_DECL
5870 && TREE_CODE (exp) != CALL_EXPR
5871 && TREE_CODE (exp) != RTL_EXPR
5872 && GET_MODE_CLASS (tmode) == MODE_INT
5873 && tmode > MAX_INTEGER_COMPUTATION_MODE)
5874 fatal ("unsupported wide integer operation");
5876 check_max_integer_computation_mode (exp);
5879 /* If will do cse, generate all results into pseudo registers
5880 since 1) that allows cse to find more things
5881 and 2) otherwise cse could produce an insn the machine
5884 if (! cse_not_expected && mode != BLKmode && target
5885 && (GET_CODE (target) != REG || REGNO (target) < FIRST_PSEUDO_REGISTER))
5892 tree function = decl_function_context (exp);
5893 /* Handle using a label in a containing function. */
5894 if (function != current_function_decl
5895 && function != inline_function_decl && function != 0)
5897 struct function *p = find_function_data (function);
5898 /* Allocate in the memory associated with the function
5899 that the label is in. */
5900 push_obstacks (p->function_obstack,
5901 p->function_maybepermanent_obstack);
5903 p->expr->x_forced_labels
5904 = gen_rtx_EXPR_LIST (VOIDmode, label_rtx (exp),
5905 p->expr->x_forced_labels);
5910 if (modifier == EXPAND_INITIALIZER)
5911 forced_labels = gen_rtx_EXPR_LIST (VOIDmode,
5916 temp = gen_rtx_MEM (FUNCTION_MODE,
5917 gen_rtx_LABEL_REF (Pmode, label_rtx (exp)));
5918 if (function != current_function_decl
5919 && function != inline_function_decl && function != 0)
5920 LABEL_REF_NONLOCAL_P (XEXP (temp, 0)) = 1;
5925 if (DECL_RTL (exp) == 0)
5927 error_with_decl (exp, "prior parameter's size depends on `%s'");
5928 return CONST0_RTX (mode);
5931 /* ... fall through ... */
5934 /* If a static var's type was incomplete when the decl was written,
5935 but the type is complete now, lay out the decl now. */
5936 if (DECL_SIZE (exp) == 0 && COMPLETE_TYPE_P (TREE_TYPE (exp))
5937 && (TREE_STATIC (exp) || DECL_EXTERNAL (exp)))
5939 push_obstacks_nochange ();
5940 end_temporary_allocation ();
5941 layout_decl (exp, 0);
5942 PUT_MODE (DECL_RTL (exp), DECL_MODE (exp));
5946 /* Although static-storage variables start off initialized, according to
5947 ANSI C, a memcpy could overwrite them with uninitialized values. So
5948 we check them too. This also lets us check for read-only variables
5949 accessed via a non-const declaration, in case it won't be detected
5950 any other way (e.g., in an embedded system or OS kernel without
5953 Aggregates are not checked here; they're handled elsewhere. */
5954 if (cfun && current_function_check_memory_usage
5956 && GET_CODE (DECL_RTL (exp)) == MEM
5957 && ! AGGREGATE_TYPE_P (TREE_TYPE (exp)))
5959 enum memory_use_mode memory_usage;
5960 memory_usage = get_memory_usage_from_modifier (modifier);
5962 in_check_memory_usage = 1;
5963 if (memory_usage != MEMORY_USE_DONT)
5964 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
5965 XEXP (DECL_RTL (exp), 0), Pmode,
5966 GEN_INT (int_size_in_bytes (type)),
5967 TYPE_MODE (sizetype),
5968 GEN_INT (memory_usage),
5969 TYPE_MODE (integer_type_node));
5970 in_check_memory_usage = 0;
5973 /* ... fall through ... */
5977 if (DECL_RTL (exp) == 0)
5980 /* Ensure variable marked as used even if it doesn't go through
5981 a parser. If it hasn't be used yet, write out an external
5983 if (! TREE_USED (exp))
5985 assemble_external (exp);
5986 TREE_USED (exp) = 1;
5989 /* Show we haven't gotten RTL for this yet. */
5992 /* Handle variables inherited from containing functions. */
5993 context = decl_function_context (exp);
5995 /* We treat inline_function_decl as an alias for the current function
5996 because that is the inline function whose vars, types, etc.
5997 are being merged into the current function.
5998 See expand_inline_function. */
6000 if (context != 0 && context != current_function_decl
6001 && context != inline_function_decl
6002 /* If var is static, we don't need a static chain to access it. */
6003 && ! (GET_CODE (DECL_RTL (exp)) == MEM
6004 && CONSTANT_P (XEXP (DECL_RTL (exp), 0))))
6008 /* Mark as non-local and addressable. */
6009 DECL_NONLOCAL (exp) = 1;
6010 if (DECL_NO_STATIC_CHAIN (current_function_decl))
6012 mark_addressable (exp);
6013 if (GET_CODE (DECL_RTL (exp)) != MEM)
6015 addr = XEXP (DECL_RTL (exp), 0);
6016 if (GET_CODE (addr) == MEM)
6017 addr = change_address (addr, Pmode,
6018 fix_lexical_addr (XEXP (addr, 0), exp));
6020 addr = fix_lexical_addr (addr, exp);
6022 temp = change_address (DECL_RTL (exp), mode, addr);
6025 /* This is the case of an array whose size is to be determined
6026 from its initializer, while the initializer is still being parsed.
6029 else if (GET_CODE (DECL_RTL (exp)) == MEM
6030 && GET_CODE (XEXP (DECL_RTL (exp), 0)) == REG)
6031 temp = change_address (DECL_RTL (exp), GET_MODE (DECL_RTL (exp)),
6032 XEXP (DECL_RTL (exp), 0));
6034 /* If DECL_RTL is memory, we are in the normal case and either
6035 the address is not valid or it is not a register and -fforce-addr
6036 is specified, get the address into a register. */
6038 else if (GET_CODE (DECL_RTL (exp)) == MEM
6039 && modifier != EXPAND_CONST_ADDRESS
6040 && modifier != EXPAND_SUM
6041 && modifier != EXPAND_INITIALIZER
6042 && (! memory_address_p (DECL_MODE (exp),
6043 XEXP (DECL_RTL (exp), 0))
6045 && GET_CODE (XEXP (DECL_RTL (exp), 0)) != REG)))
6046 temp = change_address (DECL_RTL (exp), VOIDmode,
6047 copy_rtx (XEXP (DECL_RTL (exp), 0)));
6049 /* If we got something, return it. But first, set the alignment
6050 the address is a register. */
6053 if (GET_CODE (temp) == MEM && GET_CODE (XEXP (temp, 0)) == REG)
6054 mark_reg_pointer (XEXP (temp, 0), DECL_ALIGN (exp));
6059 /* If the mode of DECL_RTL does not match that of the decl, it
6060 must be a promoted value. We return a SUBREG of the wanted mode,
6061 but mark it so that we know that it was already extended. */
6063 if (GET_CODE (DECL_RTL (exp)) == REG
6064 && GET_MODE (DECL_RTL (exp)) != mode)
6066 /* Get the signedness used for this variable. Ensure we get the
6067 same mode we got when the variable was declared. */
6068 if (GET_MODE (DECL_RTL (exp))
6069 != promote_mode (type, DECL_MODE (exp), &unsignedp, 0))
6072 temp = gen_rtx_SUBREG (mode, DECL_RTL (exp), 0);
6073 SUBREG_PROMOTED_VAR_P (temp) = 1;
6074 SUBREG_PROMOTED_UNSIGNED_P (temp) = unsignedp;
6078 return DECL_RTL (exp);
6081 return immed_double_const (TREE_INT_CST_LOW (exp),
6082 TREE_INT_CST_HIGH (exp), mode);
6085 return expand_expr (DECL_INITIAL (exp), target, VOIDmode,
6086 EXPAND_MEMORY_USE_BAD);
6089 /* If optimized, generate immediate CONST_DOUBLE
6090 which will be turned into memory by reload if necessary.
6092 We used to force a register so that loop.c could see it. But
6093 this does not allow gen_* patterns to perform optimizations with
6094 the constants. It also produces two insns in cases like "x = 1.0;".
6095 On most machines, floating-point constants are not permitted in
6096 many insns, so we'd end up copying it to a register in any case.
6098 Now, we do the copying in expand_binop, if appropriate. */
6099 return immed_real_const (exp);
6103 if (! TREE_CST_RTL (exp))
6104 output_constant_def (exp);
6106 /* TREE_CST_RTL probably contains a constant address.
6107 On RISC machines where a constant address isn't valid,
6108 make some insns to get that address into a register. */
6109 if (GET_CODE (TREE_CST_RTL (exp)) == MEM
6110 && modifier != EXPAND_CONST_ADDRESS
6111 && modifier != EXPAND_INITIALIZER
6112 && modifier != EXPAND_SUM
6113 && (! memory_address_p (mode, XEXP (TREE_CST_RTL (exp), 0))
6115 && GET_CODE (XEXP (TREE_CST_RTL (exp), 0)) != REG)))
6116 return change_address (TREE_CST_RTL (exp), VOIDmode,
6117 copy_rtx (XEXP (TREE_CST_RTL (exp), 0)));
6118 return TREE_CST_RTL (exp);
6120 case EXPR_WITH_FILE_LOCATION:
6123 const char *saved_input_filename = input_filename;
6124 int saved_lineno = lineno;
6125 input_filename = EXPR_WFL_FILENAME (exp);
6126 lineno = EXPR_WFL_LINENO (exp);
6127 if (EXPR_WFL_EMIT_LINE_NOTE (exp))
6128 emit_line_note (input_filename, lineno);
6129 /* Possibly avoid switching back and force here. */
6130 to_return = expand_expr (EXPR_WFL_NODE (exp), target, tmode, modifier);
6131 input_filename = saved_input_filename;
6132 lineno = saved_lineno;
6137 context = decl_function_context (exp);
6139 /* If this SAVE_EXPR was at global context, assume we are an
6140 initialization function and move it into our context. */
6142 SAVE_EXPR_CONTEXT (exp) = current_function_decl;
6144 /* We treat inline_function_decl as an alias for the current function
6145 because that is the inline function whose vars, types, etc.
6146 are being merged into the current function.
6147 See expand_inline_function. */
6148 if (context == current_function_decl || context == inline_function_decl)
6151 /* If this is non-local, handle it. */
6154 /* The following call just exists to abort if the context is
6155 not of a containing function. */
6156 find_function_data (context);
6158 temp = SAVE_EXPR_RTL (exp);
6159 if (temp && GET_CODE (temp) == REG)
6161 put_var_into_stack (exp);
6162 temp = SAVE_EXPR_RTL (exp);
6164 if (temp == 0 || GET_CODE (temp) != MEM)
6166 return change_address (temp, mode,
6167 fix_lexical_addr (XEXP (temp, 0), exp));
6169 if (SAVE_EXPR_RTL (exp) == 0)
6171 if (mode == VOIDmode)
6174 temp = assign_temp (type, 3, 0, 0);
6176 SAVE_EXPR_RTL (exp) = temp;
6177 if (!optimize && GET_CODE (temp) == REG)
6178 save_expr_regs = gen_rtx_EXPR_LIST (VOIDmode, temp,
6181 /* If the mode of TEMP does not match that of the expression, it
6182 must be a promoted value. We pass store_expr a SUBREG of the
6183 wanted mode but mark it so that we know that it was already
6184 extended. Note that `unsignedp' was modified above in
6187 if (GET_CODE (temp) == REG && GET_MODE (temp) != mode)
6189 temp = gen_rtx_SUBREG (mode, SAVE_EXPR_RTL (exp), 0);
6190 SUBREG_PROMOTED_VAR_P (temp) = 1;
6191 SUBREG_PROMOTED_UNSIGNED_P (temp) = unsignedp;
6194 if (temp == const0_rtx)
6195 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode,
6196 EXPAND_MEMORY_USE_BAD);
6198 store_expr (TREE_OPERAND (exp, 0), temp, 0);
6200 TREE_USED (exp) = 1;
6203 /* If the mode of SAVE_EXPR_RTL does not match that of the expression, it
6204 must be a promoted value. We return a SUBREG of the wanted mode,
6205 but mark it so that we know that it was already extended. */
6207 if (GET_CODE (SAVE_EXPR_RTL (exp)) == REG
6208 && GET_MODE (SAVE_EXPR_RTL (exp)) != mode)
6210 /* Compute the signedness and make the proper SUBREG. */
6211 promote_mode (type, mode, &unsignedp, 0);
6212 temp = gen_rtx_SUBREG (mode, SAVE_EXPR_RTL (exp), 0);
6213 SUBREG_PROMOTED_VAR_P (temp) = 1;
6214 SUBREG_PROMOTED_UNSIGNED_P (temp) = unsignedp;
6218 return SAVE_EXPR_RTL (exp);
6223 temp = expand_expr (TREE_OPERAND (exp, 0), target, tmode, modifier);
6224 TREE_OPERAND (exp, 0) = unsave_expr_now (TREE_OPERAND (exp, 0));
6228 case PLACEHOLDER_EXPR:
6230 tree placeholder_expr;
6232 /* If there is an object on the head of the placeholder list,
6233 see if some object in it of type TYPE or a pointer to it. For
6234 further information, see tree.def. */
6235 for (placeholder_expr = placeholder_list;
6236 placeholder_expr != 0;
6237 placeholder_expr = TREE_CHAIN (placeholder_expr))
6239 tree need_type = TYPE_MAIN_VARIANT (type);
6241 tree old_list = placeholder_list;
6244 /* Find the outermost reference that is of the type we want.
6245 If none, see if any object has a type that is a pointer to
6246 the type we want. */
6247 for (elt = TREE_PURPOSE (placeholder_expr);
6248 elt != 0 && object == 0;
6250 = ((TREE_CODE (elt) == COMPOUND_EXPR
6251 || TREE_CODE (elt) == COND_EXPR)
6252 ? TREE_OPERAND (elt, 1)
6253 : (TREE_CODE_CLASS (TREE_CODE (elt)) == 'r'
6254 || TREE_CODE_CLASS (TREE_CODE (elt)) == '1'
6255 || TREE_CODE_CLASS (TREE_CODE (elt)) == '2'
6256 || TREE_CODE_CLASS (TREE_CODE (elt)) == 'e')
6257 ? TREE_OPERAND (elt, 0) : 0))
6258 if (TYPE_MAIN_VARIANT (TREE_TYPE (elt)) == need_type)
6261 for (elt = TREE_PURPOSE (placeholder_expr);
6262 elt != 0 && object == 0;
6264 = ((TREE_CODE (elt) == COMPOUND_EXPR
6265 || TREE_CODE (elt) == COND_EXPR)
6266 ? TREE_OPERAND (elt, 1)
6267 : (TREE_CODE_CLASS (TREE_CODE (elt)) == 'r'
6268 || TREE_CODE_CLASS (TREE_CODE (elt)) == '1'
6269 || TREE_CODE_CLASS (TREE_CODE (elt)) == '2'
6270 || TREE_CODE_CLASS (TREE_CODE (elt)) == 'e')
6271 ? TREE_OPERAND (elt, 0) : 0))
6272 if (POINTER_TYPE_P (TREE_TYPE (elt))
6273 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (elt)))
6275 object = build1 (INDIRECT_REF, need_type, elt);
6279 /* Expand this object skipping the list entries before
6280 it was found in case it is also a PLACEHOLDER_EXPR.
6281 In that case, we want to translate it using subsequent
6283 placeholder_list = TREE_CHAIN (placeholder_expr);
6284 temp = expand_expr (object, original_target, tmode,
6286 placeholder_list = old_list;
6292 /* We can't find the object or there was a missing WITH_RECORD_EXPR. */
6295 case WITH_RECORD_EXPR:
6296 /* Put the object on the placeholder list, expand our first operand,
6297 and pop the list. */
6298 placeholder_list = tree_cons (TREE_OPERAND (exp, 1), NULL_TREE,
6300 target = expand_expr (TREE_OPERAND (exp, 0), original_target,
6301 tmode, ro_modifier);
6302 placeholder_list = TREE_CHAIN (placeholder_list);
6306 if (TREE_CODE (TREE_OPERAND (exp, 0)) == LABEL_DECL)
6307 expand_goto (TREE_OPERAND (exp, 0));
6309 expand_computed_goto (TREE_OPERAND (exp, 0));
6313 expand_exit_loop_if_false (NULL_PTR,
6314 invert_truthvalue (TREE_OPERAND (exp, 0)));
6317 case LABELED_BLOCK_EXPR:
6318 if (LABELED_BLOCK_BODY (exp))
6319 expand_expr_stmt (LABELED_BLOCK_BODY (exp));
6320 emit_label (label_rtx (LABELED_BLOCK_LABEL (exp)));
6323 case EXIT_BLOCK_EXPR:
6324 if (EXIT_BLOCK_RETURN (exp))
6325 sorry ("returned value in block_exit_expr");
6326 expand_goto (LABELED_BLOCK_LABEL (EXIT_BLOCK_LABELED_BLOCK (exp)));
6331 expand_start_loop (1);
6332 expand_expr_stmt (TREE_OPERAND (exp, 0));
6340 tree vars = TREE_OPERAND (exp, 0);
6341 int vars_need_expansion = 0;
6343 /* Need to open a binding contour here because
6344 if there are any cleanups they must be contained here. */
6345 expand_start_bindings (2);
6347 /* Mark the corresponding BLOCK for output in its proper place. */
6348 if (TREE_OPERAND (exp, 2) != 0
6349 && ! TREE_USED (TREE_OPERAND (exp, 2)))
6350 insert_block (TREE_OPERAND (exp, 2));
6352 /* If VARS have not yet been expanded, expand them now. */
6355 if (DECL_RTL (vars) == 0)
6357 vars_need_expansion = 1;
6360 expand_decl_init (vars);
6361 vars = TREE_CHAIN (vars);
6364 temp = expand_expr (TREE_OPERAND (exp, 1), target, tmode, ro_modifier);
6366 expand_end_bindings (TREE_OPERAND (exp, 0), 0, 0);
6372 if (RTL_EXPR_SEQUENCE (exp))
6374 if (RTL_EXPR_SEQUENCE (exp) == const0_rtx)
6376 emit_insns (RTL_EXPR_SEQUENCE (exp));
6377 RTL_EXPR_SEQUENCE (exp) = const0_rtx;
6379 preserve_rtl_expr_result (RTL_EXPR_RTL (exp));
6380 free_temps_for_rtl_expr (exp);
6381 return RTL_EXPR_RTL (exp);
6384 /* If we don't need the result, just ensure we evaluate any
6389 for (elt = CONSTRUCTOR_ELTS (exp); elt; elt = TREE_CHAIN (elt))
6390 expand_expr (TREE_VALUE (elt), const0_rtx, VOIDmode,
6391 EXPAND_MEMORY_USE_BAD);
6395 /* All elts simple constants => refer to a constant in memory. But
6396 if this is a non-BLKmode mode, let it store a field at a time
6397 since that should make a CONST_INT or CONST_DOUBLE when we
6398 fold. Likewise, if we have a target we can use, it is best to
6399 store directly into the target unless the type is large enough
6400 that memcpy will be used. If we are making an initializer and
6401 all operands are constant, put it in memory as well. */
6402 else if ((TREE_STATIC (exp)
6403 && ((mode == BLKmode
6404 && ! (target != 0 && safe_from_p (target, exp, 1)))
6405 || TREE_ADDRESSABLE (exp)
6406 || (host_integerp (TYPE_SIZE_UNIT (type), 1)
6407 && (! MOVE_BY_PIECES_P
6408 (tree_low_cst (TYPE_SIZE_UNIT (type), 1),
6410 && ! mostly_zeros_p (exp))))
6411 || (modifier == EXPAND_INITIALIZER && TREE_CONSTANT (exp)))
6413 rtx constructor = output_constant_def (exp);
6415 if (modifier != EXPAND_CONST_ADDRESS
6416 && modifier != EXPAND_INITIALIZER
6417 && modifier != EXPAND_SUM
6418 && (! memory_address_p (GET_MODE (constructor),
6419 XEXP (constructor, 0))
6421 && GET_CODE (XEXP (constructor, 0)) != REG)))
6422 constructor = change_address (constructor, VOIDmode,
6423 XEXP (constructor, 0));
6429 /* Handle calls that pass values in multiple non-contiguous
6430 locations. The Irix 6 ABI has examples of this. */
6431 if (target == 0 || ! safe_from_p (target, exp, 1)
6432 || GET_CODE (target) == PARALLEL)
6434 if (mode != BLKmode && ! TREE_ADDRESSABLE (exp))
6435 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
6437 target = assign_temp (type, 0, 1, 1);
6440 if (TREE_READONLY (exp))
6442 if (GET_CODE (target) == MEM)
6443 target = copy_rtx (target);
6445 RTX_UNCHANGING_P (target) = 1;
6448 store_constructor (exp, target, TYPE_ALIGN (TREE_TYPE (exp)), 0,
6449 int_size_in_bytes (TREE_TYPE (exp)));
6455 tree exp1 = TREE_OPERAND (exp, 0);
6457 tree string = string_constant (exp1, &index);
6459 /* Try to optimize reads from const strings. */
6461 && TREE_CODE (string) == STRING_CST
6462 && TREE_CODE (index) == INTEGER_CST
6463 && compare_tree_int (index, TREE_STRING_LENGTH (string)) < 0
6464 && GET_MODE_CLASS (mode) == MODE_INT
6465 && GET_MODE_SIZE (mode) == 1
6466 && modifier != EXPAND_MEMORY_USE_WO)
6468 GEN_INT (TREE_STRING_POINTER (string)[TREE_INT_CST_LOW (index)]);
6470 op0 = expand_expr (exp1, NULL_RTX, VOIDmode, EXPAND_SUM);
6471 op0 = memory_address (mode, op0);
6473 if (cfun && current_function_check_memory_usage
6474 && ! AGGREGATE_TYPE_P (TREE_TYPE (exp)))
6476 enum memory_use_mode memory_usage;
6477 memory_usage = get_memory_usage_from_modifier (modifier);
6479 if (memory_usage != MEMORY_USE_DONT)
6481 in_check_memory_usage = 1;
6482 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
6484 GEN_INT (int_size_in_bytes (type)),
6485 TYPE_MODE (sizetype),
6486 GEN_INT (memory_usage),
6487 TYPE_MODE (integer_type_node));
6488 in_check_memory_usage = 0;
6492 temp = gen_rtx_MEM (mode, op0);
6493 set_mem_attributes (temp, exp, 0);
6495 /* It is incorrect to set RTX_UNCHANGING_P from TREE_READONLY
6496 here, because, in C and C++, the fact that a location is accessed
6497 through a pointer to const does not mean that the value there can
6498 never change. Languages where it can never change should
6499 also set TREE_STATIC. */
6500 RTX_UNCHANGING_P (temp) = TREE_READONLY (exp) & TREE_STATIC (exp);
6502 /* If we are writing to this object and its type is a record with
6503 readonly fields, we must mark it as readonly so it will
6504 conflict with readonly references to those fields. */
6505 if (modifier == EXPAND_MEMORY_USE_WO
6506 && TREE_CODE (type) == RECORD_TYPE && readonly_fields_p (type))
6507 RTX_UNCHANGING_P (temp) = 1;
6513 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) != ARRAY_TYPE)
6517 tree array = TREE_OPERAND (exp, 0);
6518 tree domain = TYPE_DOMAIN (TREE_TYPE (array));
6519 tree low_bound = domain ? TYPE_MIN_VALUE (domain) : integer_zero_node;
6520 tree index = convert (sizetype, TREE_OPERAND (exp, 1));
6523 /* Optimize the special-case of a zero lower bound.
6525 We convert the low_bound to sizetype to avoid some problems
6526 with constant folding. (E.g. suppose the lower bound is 1,
6527 and its mode is QI. Without the conversion, (ARRAY
6528 +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1))
6529 +INDEX), which becomes (ARRAY+255+INDEX). Oops!) */
6531 if (! integer_zerop (low_bound))
6532 index = size_diffop (index, convert (sizetype, low_bound));
6534 /* Fold an expression like: "foo"[2].
6535 This is not done in fold so it won't happen inside &.
6536 Don't fold if this is for wide characters since it's too
6537 difficult to do correctly and this is a very rare case. */
6539 if (TREE_CODE (array) == STRING_CST
6540 && TREE_CODE (index) == INTEGER_CST
6541 && compare_tree_int (index, TREE_STRING_LENGTH (array)) < 0
6542 && GET_MODE_CLASS (mode) == MODE_INT
6543 && GET_MODE_SIZE (mode) == 1)
6545 GEN_INT (TREE_STRING_POINTER (array)[TREE_INT_CST_LOW (index)]);
6547 /* If this is a constant index into a constant array,
6548 just get the value from the array. Handle both the cases when
6549 we have an explicit constructor and when our operand is a variable
6550 that was declared const. */
6552 if (TREE_CODE (array) == CONSTRUCTOR && ! TREE_SIDE_EFFECTS (array)
6553 && TREE_CODE (index) == INTEGER_CST
6554 && 0 > compare_tree_int (index,
6555 list_length (CONSTRUCTOR_ELTS
6556 (TREE_OPERAND (exp, 0)))))
6560 for (elem = CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0)),
6561 i = TREE_INT_CST_LOW (index);
6562 elem != 0 && i != 0; i--, elem = TREE_CHAIN (elem))
6566 return expand_expr (fold (TREE_VALUE (elem)), target,
6567 tmode, ro_modifier);
6570 else if (optimize >= 1
6571 && TREE_READONLY (array) && ! TREE_SIDE_EFFECTS (array)
6572 && TREE_CODE (array) == VAR_DECL && DECL_INITIAL (array)
6573 && TREE_CODE (DECL_INITIAL (array)) != ERROR_MARK)
6575 if (TREE_CODE (index) == INTEGER_CST)
6577 tree init = DECL_INITIAL (array);
6579 if (TREE_CODE (init) == CONSTRUCTOR)
6583 for (elem = CONSTRUCTOR_ELTS (init);
6585 && !tree_int_cst_equal (TREE_PURPOSE (elem), index));
6586 elem = TREE_CHAIN (elem))
6590 return expand_expr (fold (TREE_VALUE (elem)), target,
6591 tmode, ro_modifier);
6593 else if (TREE_CODE (init) == STRING_CST
6594 && 0 > compare_tree_int (index,
6595 TREE_STRING_LENGTH (init)))
6597 (TREE_STRING_POINTER
6598 (init)[TREE_INT_CST_LOW (index)]));
6606 /* If the operand is a CONSTRUCTOR, we can just extract the
6607 appropriate field if it is present. Don't do this if we have
6608 already written the data since we want to refer to that copy
6609 and varasm.c assumes that's what we'll do. */
6610 if (code != ARRAY_REF
6611 && TREE_CODE (TREE_OPERAND (exp, 0)) == CONSTRUCTOR
6612 && TREE_CST_RTL (TREE_OPERAND (exp, 0)) == 0)
6616 for (elt = CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0)); elt;
6617 elt = TREE_CHAIN (elt))
6618 if (TREE_PURPOSE (elt) == TREE_OPERAND (exp, 1)
6619 /* We can normally use the value of the field in the
6620 CONSTRUCTOR. However, if this is a bitfield in
6621 an integral mode that we can fit in a HOST_WIDE_INT,
6622 we must mask only the number of bits in the bitfield,
6623 since this is done implicitly by the constructor. If
6624 the bitfield does not meet either of those conditions,
6625 we can't do this optimization. */
6626 && (! DECL_BIT_FIELD (TREE_PURPOSE (elt))
6627 || ((GET_MODE_CLASS (DECL_MODE (TREE_PURPOSE (elt)))
6629 && (GET_MODE_BITSIZE (DECL_MODE (TREE_PURPOSE (elt)))
6630 <= HOST_BITS_PER_WIDE_INT))))
6632 op0 = expand_expr (TREE_VALUE (elt), target, tmode, modifier);
6633 if (DECL_BIT_FIELD (TREE_PURPOSE (elt)))
6635 HOST_WIDE_INT bitsize
6636 = TREE_INT_CST_LOW (DECL_SIZE (TREE_PURPOSE (elt)));
6638 if (TREE_UNSIGNED (TREE_TYPE (TREE_PURPOSE (elt))))
6640 op1 = GEN_INT (((HOST_WIDE_INT) 1 << bitsize) - 1);
6641 op0 = expand_and (op0, op1, target);
6645 enum machine_mode imode
6646 = TYPE_MODE (TREE_TYPE (TREE_PURPOSE (elt)));
6648 = build_int_2 (GET_MODE_BITSIZE (imode) - bitsize,
6651 op0 = expand_shift (LSHIFT_EXPR, imode, op0, count,
6653 op0 = expand_shift (RSHIFT_EXPR, imode, op0, count,
6663 enum machine_mode mode1;
6664 HOST_WIDE_INT bitsize, bitpos;
6667 unsigned int alignment;
6668 tree tem = get_inner_reference (exp, &bitsize, &bitpos, &offset,
6669 &mode1, &unsignedp, &volatilep,
6672 /* If we got back the original object, something is wrong. Perhaps
6673 we are evaluating an expression too early. In any event, don't
6674 infinitely recurse. */
6678 /* If TEM's type is a union of variable size, pass TARGET to the inner
6679 computation, since it will need a temporary and TARGET is known
6680 to have to do. This occurs in unchecked conversion in Ada. */
6682 op0 = expand_expr (tem,
6683 (TREE_CODE (TREE_TYPE (tem)) == UNION_TYPE
6684 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (tem)))
6686 ? target : NULL_RTX),
6688 (modifier == EXPAND_INITIALIZER
6689 || modifier == EXPAND_CONST_ADDRESS)
6690 ? modifier : EXPAND_NORMAL);
6692 /* If this is a constant, put it into a register if it is a
6693 legitimate constant and OFFSET is 0 and memory if it isn't. */
6694 if (CONSTANT_P (op0))
6696 enum machine_mode mode = TYPE_MODE (TREE_TYPE (tem));
6697 if (mode != BLKmode && LEGITIMATE_CONSTANT_P (op0)
6699 op0 = force_reg (mode, op0);
6701 op0 = validize_mem (force_const_mem (mode, op0));
6706 rtx offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, 0);
6708 /* If this object is in memory, put it into a register.
6709 This case can't occur in C, but can in Ada if we have
6710 unchecked conversion of an expression from a scalar type to
6711 an array or record type. */
6712 if (GET_CODE (op0) == REG || GET_CODE (op0) == SUBREG
6713 || GET_CODE (op0) == CONCAT || GET_CODE (op0) == ADDRESSOF)
6715 rtx memloc = assign_temp (TREE_TYPE (tem), 1, 1, 1);
6717 mark_temp_addr_taken (memloc);
6718 emit_move_insn (memloc, op0);
6722 if (GET_CODE (op0) != MEM)
6725 if (GET_MODE (offset_rtx) != ptr_mode)
6727 #ifdef POINTERS_EXTEND_UNSIGNED
6728 offset_rtx = convert_memory_address (ptr_mode, offset_rtx);
6730 offset_rtx = convert_to_mode (ptr_mode, offset_rtx, 0);
6734 /* A constant address in OP0 can have VOIDmode, we must not try
6735 to call force_reg for that case. Avoid that case. */
6736 if (GET_CODE (op0) == MEM
6737 && GET_MODE (op0) == BLKmode
6738 && GET_MODE (XEXP (op0, 0)) != VOIDmode
6740 && (bitpos % bitsize) == 0
6741 && (bitsize % GET_MODE_ALIGNMENT (mode1)) == 0
6742 && alignment == GET_MODE_ALIGNMENT (mode1))
6744 rtx temp = change_address (op0, mode1,
6745 plus_constant (XEXP (op0, 0),
6748 if (GET_CODE (XEXP (temp, 0)) == REG)
6751 op0 = change_address (op0, mode1,
6752 force_reg (GET_MODE (XEXP (temp, 0)),
6757 op0 = change_address (op0, VOIDmode,
6758 gen_rtx_PLUS (ptr_mode, XEXP (op0, 0),
6759 force_reg (ptr_mode,
6763 /* Don't forget about volatility even if this is a bitfield. */
6764 if (GET_CODE (op0) == MEM && volatilep && ! MEM_VOLATILE_P (op0))
6766 op0 = copy_rtx (op0);
6767 MEM_VOLATILE_P (op0) = 1;
6770 /* Check the access. */
6771 if (cfun != 0 && current_function_check_memory_usage
6772 && GET_CODE (op0) == MEM)
6774 enum memory_use_mode memory_usage;
6775 memory_usage = get_memory_usage_from_modifier (modifier);
6777 if (memory_usage != MEMORY_USE_DONT)
6782 to = plus_constant (XEXP (op0, 0), (bitpos / BITS_PER_UNIT));
6783 size = (bitpos % BITS_PER_UNIT) + bitsize + BITS_PER_UNIT - 1;
6785 /* Check the access right of the pointer. */
6786 in_check_memory_usage = 1;
6787 if (size > BITS_PER_UNIT)
6788 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
6790 GEN_INT (size / BITS_PER_UNIT),
6791 TYPE_MODE (sizetype),
6792 GEN_INT (memory_usage),
6793 TYPE_MODE (integer_type_node));
6794 in_check_memory_usage = 0;
6798 /* In cases where an aligned union has an unaligned object
6799 as a field, we might be extracting a BLKmode value from
6800 an integer-mode (e.g., SImode) object. Handle this case
6801 by doing the extract into an object as wide as the field
6802 (which we know to be the width of a basic mode), then
6803 storing into memory, and changing the mode to BLKmode.
6804 If we ultimately want the address (EXPAND_CONST_ADDRESS or
6805 EXPAND_INITIALIZER), then we must not copy to a temporary. */
6806 if (mode1 == VOIDmode
6807 || GET_CODE (op0) == REG || GET_CODE (op0) == SUBREG
6808 || (modifier != EXPAND_CONST_ADDRESS
6809 && modifier != EXPAND_INITIALIZER
6810 && ((mode1 != BLKmode && ! direct_load[(int) mode1]
6811 && GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
6812 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT)
6813 /* If the field isn't aligned enough to fetch as a memref,
6814 fetch it as a bit field. */
6815 || (mode1 != BLKmode
6816 && SLOW_UNALIGNED_ACCESS (mode1, alignment)
6817 && ((TYPE_ALIGN (TREE_TYPE (tem))
6818 < GET_MODE_ALIGNMENT (mode))
6819 || (bitpos % GET_MODE_ALIGNMENT (mode) != 0)))
6820 /* If the type and the field are a constant size and the
6821 size of the type isn't the same size as the bitfield,
6822 we must use bitfield operations. */
6824 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (exp)))
6826 && 0 != compare_tree_int (TYPE_SIZE (TREE_TYPE (exp)),
6828 || (modifier != EXPAND_CONST_ADDRESS
6829 && modifier != EXPAND_INITIALIZER
6831 && SLOW_UNALIGNED_ACCESS (mode, alignment)
6832 && (TYPE_ALIGN (type) > alignment
6833 || bitpos % TYPE_ALIGN (type) != 0)))
6835 enum machine_mode ext_mode = mode;
6837 if (ext_mode == BLKmode
6838 && ! (target != 0 && GET_CODE (op0) == MEM
6839 && GET_CODE (target) == MEM
6840 && bitpos % BITS_PER_UNIT == 0))
6841 ext_mode = mode_for_size (bitsize, MODE_INT, 1);
6843 if (ext_mode == BLKmode)
6845 /* In this case, BITPOS must start at a byte boundary and
6846 TARGET, if specified, must be a MEM. */
6847 if (GET_CODE (op0) != MEM
6848 || (target != 0 && GET_CODE (target) != MEM)
6849 || bitpos % BITS_PER_UNIT != 0)
6852 op0 = change_address (op0, VOIDmode,
6853 plus_constant (XEXP (op0, 0),
6854 bitpos / BITS_PER_UNIT));
6856 target = assign_temp (type, 0, 1, 1);
6858 emit_block_move (target, op0,
6859 GEN_INT ((bitsize + BITS_PER_UNIT - 1)
6866 op0 = validize_mem (op0);
6868 if (GET_CODE (op0) == MEM && GET_CODE (XEXP (op0, 0)) == REG)
6869 mark_reg_pointer (XEXP (op0, 0), alignment);
6871 op0 = extract_bit_field (op0, bitsize, bitpos,
6872 unsignedp, target, ext_mode, ext_mode,
6874 int_size_in_bytes (TREE_TYPE (tem)));
6876 /* If the result is a record type and BITSIZE is narrower than
6877 the mode of OP0, an integral mode, and this is a big endian
6878 machine, we must put the field into the high-order bits. */
6879 if (TREE_CODE (type) == RECORD_TYPE && BYTES_BIG_ENDIAN
6880 && GET_MODE_CLASS (GET_MODE (op0)) == MODE_INT
6881 && bitsize < GET_MODE_BITSIZE (GET_MODE (op0)))
6882 op0 = expand_shift (LSHIFT_EXPR, GET_MODE (op0), op0,
6883 size_int (GET_MODE_BITSIZE (GET_MODE (op0))
6887 if (mode == BLKmode)
6889 rtx new = assign_stack_temp (ext_mode,
6890 bitsize / BITS_PER_UNIT, 0);
6892 emit_move_insn (new, op0);
6893 op0 = copy_rtx (new);
6894 PUT_MODE (op0, BLKmode);
6895 MEM_SET_IN_STRUCT_P (op0, 1);
6901 /* If the result is BLKmode, use that to access the object
6903 if (mode == BLKmode)
6906 /* Get a reference to just this component. */
6907 if (modifier == EXPAND_CONST_ADDRESS
6908 || modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
6909 op0 = gen_rtx_MEM (mode1, plus_constant (XEXP (op0, 0),
6910 (bitpos / BITS_PER_UNIT)));
6912 op0 = change_address (op0, mode1,
6913 plus_constant (XEXP (op0, 0),
6914 (bitpos / BITS_PER_UNIT)));
6916 set_mem_attributes (op0, exp, 0);
6917 if (GET_CODE (XEXP (op0, 0)) == REG)
6918 mark_reg_pointer (XEXP (op0, 0), alignment);
6920 MEM_VOLATILE_P (op0) |= volatilep;
6921 if (mode == mode1 || mode1 == BLKmode || mode1 == tmode
6922 || modifier == EXPAND_CONST_ADDRESS
6923 || modifier == EXPAND_INITIALIZER)
6925 else if (target == 0)
6926 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
6928 convert_move (target, op0, unsignedp);
6932 /* Intended for a reference to a buffer of a file-object in Pascal.
6933 But it's not certain that a special tree code will really be
6934 necessary for these. INDIRECT_REF might work for them. */
6940 /* Pascal set IN expression.
6943 rlo = set_low - (set_low%bits_per_word);
6944 the_word = set [ (index - rlo)/bits_per_word ];
6945 bit_index = index % bits_per_word;
6946 bitmask = 1 << bit_index;
6947 return !!(the_word & bitmask); */
6949 tree set = TREE_OPERAND (exp, 0);
6950 tree index = TREE_OPERAND (exp, 1);
6951 int iunsignedp = TREE_UNSIGNED (TREE_TYPE (index));
6952 tree set_type = TREE_TYPE (set);
6953 tree set_low_bound = TYPE_MIN_VALUE (TYPE_DOMAIN (set_type));
6954 tree set_high_bound = TYPE_MAX_VALUE (TYPE_DOMAIN (set_type));
6955 rtx index_val = expand_expr (index, 0, VOIDmode, 0);
6956 rtx lo_r = expand_expr (set_low_bound, 0, VOIDmode, 0);
6957 rtx hi_r = expand_expr (set_high_bound, 0, VOIDmode, 0);
6958 rtx setval = expand_expr (set, 0, VOIDmode, 0);
6959 rtx setaddr = XEXP (setval, 0);
6960 enum machine_mode index_mode = TYPE_MODE (TREE_TYPE (index));
6962 rtx diff, quo, rem, addr, bit, result;
6964 preexpand_calls (exp);
6966 /* If domain is empty, answer is no. Likewise if index is constant
6967 and out of bounds. */
6968 if (((TREE_CODE (set_high_bound) == INTEGER_CST
6969 && TREE_CODE (set_low_bound) == INTEGER_CST
6970 && tree_int_cst_lt (set_high_bound, set_low_bound))
6971 || (TREE_CODE (index) == INTEGER_CST
6972 && TREE_CODE (set_low_bound) == INTEGER_CST
6973 && tree_int_cst_lt (index, set_low_bound))
6974 || (TREE_CODE (set_high_bound) == INTEGER_CST
6975 && TREE_CODE (index) == INTEGER_CST
6976 && tree_int_cst_lt (set_high_bound, index))))
6980 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
6982 /* If we get here, we have to generate the code for both cases
6983 (in range and out of range). */
6985 op0 = gen_label_rtx ();
6986 op1 = gen_label_rtx ();
6988 if (! (GET_CODE (index_val) == CONST_INT
6989 && GET_CODE (lo_r) == CONST_INT))
6991 emit_cmp_and_jump_insns (index_val, lo_r, LT, NULL_RTX,
6992 GET_MODE (index_val), iunsignedp, 0, op1);
6995 if (! (GET_CODE (index_val) == CONST_INT
6996 && GET_CODE (hi_r) == CONST_INT))
6998 emit_cmp_and_jump_insns (index_val, hi_r, GT, NULL_RTX,
6999 GET_MODE (index_val), iunsignedp, 0, op1);
7002 /* Calculate the element number of bit zero in the first word
7004 if (GET_CODE (lo_r) == CONST_INT)
7005 rlow = GEN_INT (INTVAL (lo_r)
7006 & ~((HOST_WIDE_INT) 1 << BITS_PER_UNIT));
7008 rlow = expand_binop (index_mode, and_optab, lo_r,
7009 GEN_INT (~((HOST_WIDE_INT) 1 << BITS_PER_UNIT)),
7010 NULL_RTX, iunsignedp, OPTAB_LIB_WIDEN);
7012 diff = expand_binop (index_mode, sub_optab, index_val, rlow,
7013 NULL_RTX, iunsignedp, OPTAB_LIB_WIDEN);
7015 quo = expand_divmod (0, TRUNC_DIV_EXPR, index_mode, diff,
7016 GEN_INT (BITS_PER_UNIT), NULL_RTX, iunsignedp);
7017 rem = expand_divmod (1, TRUNC_MOD_EXPR, index_mode, index_val,
7018 GEN_INT (BITS_PER_UNIT), NULL_RTX, iunsignedp);
7020 addr = memory_address (byte_mode,
7021 expand_binop (index_mode, add_optab, diff,
7022 setaddr, NULL_RTX, iunsignedp,
7025 /* Extract the bit we want to examine. */
7026 bit = expand_shift (RSHIFT_EXPR, byte_mode,
7027 gen_rtx_MEM (byte_mode, addr),
7028 make_tree (TREE_TYPE (index), rem),
7030 result = expand_binop (byte_mode, and_optab, bit, const1_rtx,
7031 GET_MODE (target) == byte_mode ? target : 0,
7032 1, OPTAB_LIB_WIDEN);
7034 if (result != target)
7035 convert_move (target, result, 1);
7037 /* Output the code to handle the out-of-range case. */
7040 emit_move_insn (target, const0_rtx);
7045 case WITH_CLEANUP_EXPR:
7046 if (RTL_EXPR_RTL (exp) == 0)
7049 = expand_expr (TREE_OPERAND (exp, 0), target, tmode, ro_modifier);
7050 expand_decl_cleanup (NULL_TREE, TREE_OPERAND (exp, 2));
7052 /* That's it for this cleanup. */
7053 TREE_OPERAND (exp, 2) = 0;
7055 return RTL_EXPR_RTL (exp);
7057 case CLEANUP_POINT_EXPR:
7059 /* Start a new binding layer that will keep track of all cleanup
7060 actions to be performed. */
7061 expand_start_bindings (2);
7063 target_temp_slot_level = temp_slot_level;
7065 op0 = expand_expr (TREE_OPERAND (exp, 0), target, tmode, ro_modifier);
7066 /* If we're going to use this value, load it up now. */
7068 op0 = force_not_mem (op0);
7069 preserve_temp_slots (op0);
7070 expand_end_bindings (NULL_TREE, 0, 0);
7075 /* Check for a built-in function. */
7076 if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
7077 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
7079 && DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
7080 return expand_builtin (exp, target, subtarget, tmode, ignore);
7082 /* If this call was expanded already by preexpand_calls,
7083 just return the result we got. */
7084 if (CALL_EXPR_RTL (exp) != 0)
7085 return CALL_EXPR_RTL (exp);
7087 return expand_call (exp, target, ignore);
7089 case NON_LVALUE_EXPR:
7092 case REFERENCE_EXPR:
7093 if (TREE_OPERAND (exp, 0) == error_mark_node)
7096 if (TREE_CODE (type) == UNION_TYPE)
7098 tree valtype = TREE_TYPE (TREE_OPERAND (exp, 0));
7100 /* If both input and output are BLKmode, this conversion
7101 isn't actually doing anything unless we need to make the
7102 alignment stricter. */
7103 if (mode == BLKmode && TYPE_MODE (valtype) == BLKmode
7104 && (TYPE_ALIGN (type) <= TYPE_ALIGN (valtype)
7105 || TYPE_ALIGN (type) >= BIGGEST_ALIGNMENT))
7106 return expand_expr (TREE_OPERAND (exp, 0), target, tmode,
7111 if (mode != BLKmode)
7112 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
7114 target = assign_temp (type, 0, 1, 1);
7117 if (GET_CODE (target) == MEM)
7118 /* Store data into beginning of memory target. */
7119 store_expr (TREE_OPERAND (exp, 0),
7120 change_address (target, TYPE_MODE (valtype), 0), 0);
7122 else if (GET_CODE (target) == REG)
7123 /* Store this field into a union of the proper type. */
7124 store_field (target,
7125 MIN ((int_size_in_bytes (TREE_TYPE
7126 (TREE_OPERAND (exp, 0)))
7128 GET_MODE_BITSIZE (mode)),
7129 0, TYPE_MODE (valtype), TREE_OPERAND (exp, 0),
7130 VOIDmode, 0, BITS_PER_UNIT,
7131 int_size_in_bytes (type), 0);
7135 /* Return the entire union. */
7139 if (mode == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))
7141 op0 = expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode,
7144 /* If the signedness of the conversion differs and OP0 is
7145 a promoted SUBREG, clear that indication since we now
7146 have to do the proper extension. */
7147 if (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))) != unsignedp
7148 && GET_CODE (op0) == SUBREG)
7149 SUBREG_PROMOTED_VAR_P (op0) = 0;
7154 op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, mode, 0);
7155 if (GET_MODE (op0) == mode)
7158 /* If OP0 is a constant, just convert it into the proper mode. */
7159 if (CONSTANT_P (op0))
7161 convert_modes (mode, TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))),
7162 op0, TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
7164 if (modifier == EXPAND_INITIALIZER)
7165 return gen_rtx_fmt_e (unsignedp ? ZERO_EXTEND : SIGN_EXTEND, mode, op0);
7169 convert_to_mode (mode, op0,
7170 TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
7172 convert_move (target, op0,
7173 TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
7177 /* We come here from MINUS_EXPR when the second operand is a
7180 this_optab = add_optab;
7182 /* If we are adding a constant, an RTL_EXPR that is sp, fp, or ap, and
7183 something else, make sure we add the register to the constant and
7184 then to the other thing. This case can occur during strength
7185 reduction and doing it this way will produce better code if the
7186 frame pointer or argument pointer is eliminated.
7188 fold-const.c will ensure that the constant is always in the inner
7189 PLUS_EXPR, so the only case we need to do anything about is if
7190 sp, ap, or fp is our second argument, in which case we must swap
7191 the innermost first argument and our second argument. */
7193 if (TREE_CODE (TREE_OPERAND (exp, 0)) == PLUS_EXPR
7194 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 1)) == INTEGER_CST
7195 && TREE_CODE (TREE_OPERAND (exp, 1)) == RTL_EXPR
7196 && (RTL_EXPR_RTL (TREE_OPERAND (exp, 1)) == frame_pointer_rtx
7197 || RTL_EXPR_RTL (TREE_OPERAND (exp, 1)) == stack_pointer_rtx
7198 || RTL_EXPR_RTL (TREE_OPERAND (exp, 1)) == arg_pointer_rtx))
7200 tree t = TREE_OPERAND (exp, 1);
7202 TREE_OPERAND (exp, 1) = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
7203 TREE_OPERAND (TREE_OPERAND (exp, 0), 0) = t;
7206 /* If the result is to be ptr_mode and we are adding an integer to
7207 something, we might be forming a constant. So try to use
7208 plus_constant. If it produces a sum and we can't accept it,
7209 use force_operand. This allows P = &ARR[const] to generate
7210 efficient code on machines where a SYMBOL_REF is not a valid
7213 If this is an EXPAND_SUM call, always return the sum. */
7214 if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER
7215 || mode == ptr_mode)
7217 if (TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST
7218 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
7219 && TREE_CONSTANT (TREE_OPERAND (exp, 1)))
7223 op1 = expand_expr (TREE_OPERAND (exp, 1), subtarget, VOIDmode,
7225 /* Use immed_double_const to ensure that the constant is
7226 truncated according to the mode of OP1, then sign extended
7227 to a HOST_WIDE_INT. Using the constant directly can result
7228 in non-canonical RTL in a 64x32 cross compile. */
7230 = immed_double_const (TREE_INT_CST_LOW (TREE_OPERAND (exp, 0)),
7232 TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 1))));
7233 op1 = plus_constant (op1, INTVAL (constant_part));
7234 if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7235 op1 = force_operand (op1, target);
7239 else if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
7240 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_INT
7241 && TREE_CONSTANT (TREE_OPERAND (exp, 0)))
7245 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode,
7247 if (! CONSTANT_P (op0))
7249 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX,
7250 VOIDmode, modifier);
7251 /* Don't go to both_summands if modifier
7252 says it's not right to return a PLUS. */
7253 if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7257 /* Use immed_double_const to ensure that the constant is
7258 truncated according to the mode of OP1, then sign extended
7259 to a HOST_WIDE_INT. Using the constant directly can result
7260 in non-canonical RTL in a 64x32 cross compile. */
7262 = immed_double_const (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)),
7264 TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))));
7265 op0 = plus_constant (op0, INTVAL (constant_part));
7266 if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7267 op0 = force_operand (op0, target);
7272 /* No sense saving up arithmetic to be done
7273 if it's all in the wrong mode to form part of an address.
7274 And force_operand won't know whether to sign-extend or
7276 if ((modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7277 || mode != ptr_mode)
7280 preexpand_calls (exp);
7281 if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
7284 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, ro_modifier);
7285 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, ro_modifier);
7288 /* Make sure any term that's a sum with a constant comes last. */
7289 if (GET_CODE (op0) == PLUS
7290 && CONSTANT_P (XEXP (op0, 1)))
7296 /* If adding to a sum including a constant,
7297 associate it to put the constant outside. */
7298 if (GET_CODE (op1) == PLUS
7299 && CONSTANT_P (XEXP (op1, 1)))
7301 rtx constant_term = const0_rtx;
7303 temp = simplify_binary_operation (PLUS, mode, XEXP (op1, 0), op0);
7306 /* Ensure that MULT comes first if there is one. */
7307 else if (GET_CODE (op0) == MULT)
7308 op0 = gen_rtx_PLUS (mode, op0, XEXP (op1, 0));
7310 op0 = gen_rtx_PLUS (mode, XEXP (op1, 0), op0);
7312 /* Let's also eliminate constants from op0 if possible. */
7313 op0 = eliminate_constant_term (op0, &constant_term);
7315 /* CONSTANT_TERM and XEXP (op1, 1) are known to be constant, so
7316 their sum should be a constant. Form it into OP1, since the
7317 result we want will then be OP0 + OP1. */
7319 temp = simplify_binary_operation (PLUS, mode, constant_term,
7324 op1 = gen_rtx_PLUS (mode, constant_term, XEXP (op1, 1));
7327 /* Put a constant term last and put a multiplication first. */
7328 if (CONSTANT_P (op0) || GET_CODE (op1) == MULT)
7329 temp = op1, op1 = op0, op0 = temp;
7331 temp = simplify_binary_operation (PLUS, mode, op0, op1);
7332 return temp ? temp : gen_rtx_PLUS (mode, op0, op1);
7335 /* For initializers, we are allowed to return a MINUS of two
7336 symbolic constants. Here we handle all cases when both operands
7338 /* Handle difference of two symbolic constants,
7339 for the sake of an initializer. */
7340 if ((modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
7341 && really_constant_p (TREE_OPERAND (exp, 0))
7342 && really_constant_p (TREE_OPERAND (exp, 1)))
7344 rtx op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX,
7345 VOIDmode, ro_modifier);
7346 rtx op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX,
7347 VOIDmode, ro_modifier);
7349 /* If the last operand is a CONST_INT, use plus_constant of
7350 the negated constant. Else make the MINUS. */
7351 if (GET_CODE (op1) == CONST_INT)
7352 return plus_constant (op0, - INTVAL (op1));
7354 return gen_rtx_MINUS (mode, op0, op1);
7356 /* Convert A - const to A + (-const). */
7357 if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST)
7359 tree negated = fold (build1 (NEGATE_EXPR, type,
7360 TREE_OPERAND (exp, 1)));
7362 if (TREE_UNSIGNED (type) || TREE_OVERFLOW (negated))
7363 /* If we can't negate the constant in TYPE, leave it alone and
7364 expand_binop will negate it for us. We used to try to do it
7365 here in the signed version of TYPE, but that doesn't work
7366 on POINTER_TYPEs. */;
7369 exp = build (PLUS_EXPR, type, TREE_OPERAND (exp, 0), negated);
7373 this_optab = sub_optab;
7377 preexpand_calls (exp);
7378 /* If first operand is constant, swap them.
7379 Thus the following special case checks need only
7380 check the second operand. */
7381 if (TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST)
7383 register tree t1 = TREE_OPERAND (exp, 0);
7384 TREE_OPERAND (exp, 0) = TREE_OPERAND (exp, 1);
7385 TREE_OPERAND (exp, 1) = t1;
7388 /* Attempt to return something suitable for generating an
7389 indexed address, for machines that support that. */
7391 if (modifier == EXPAND_SUM && mode == ptr_mode
7392 && TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
7393 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
7395 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode,
7398 /* Apply distributive law if OP0 is x+c. */
7399 if (GET_CODE (op0) == PLUS
7400 && GET_CODE (XEXP (op0, 1)) == CONST_INT)
7405 (mode, XEXP (op0, 0),
7406 GEN_INT (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)))),
7407 GEN_INT (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1))
7408 * INTVAL (XEXP (op0, 1))));
7410 if (GET_CODE (op0) != REG)
7411 op0 = force_operand (op0, NULL_RTX);
7412 if (GET_CODE (op0) != REG)
7413 op0 = copy_to_mode_reg (mode, op0);
7416 gen_rtx_MULT (mode, op0,
7417 GEN_INT (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1))));
7420 if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
7423 /* Check for multiplying things that have been extended
7424 from a narrower type. If this machine supports multiplying
7425 in that narrower type with a result in the desired type,
7426 do it that way, and avoid the explicit type-conversion. */
7427 if (TREE_CODE (TREE_OPERAND (exp, 0)) == NOP_EXPR
7428 && TREE_CODE (type) == INTEGER_TYPE
7429 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
7430 < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp, 0))))
7431 && ((TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
7432 && int_fits_type_p (TREE_OPERAND (exp, 1),
7433 TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
7434 /* Don't use a widening multiply if a shift will do. */
7435 && ((GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 1))))
7436 > HOST_BITS_PER_WIDE_INT)
7437 || exact_log2 (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1))) < 0))
7439 (TREE_CODE (TREE_OPERAND (exp, 1)) == NOP_EXPR
7440 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 1), 0)))
7442 TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))))
7443 /* If both operands are extended, they must either both
7444 be zero-extended or both be sign-extended. */
7445 && (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 1), 0)))
7447 TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))))))
7449 enum machine_mode innermode
7450 = TYPE_MODE (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)));
7451 optab other_optab = (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
7452 ? smul_widen_optab : umul_widen_optab);
7453 this_optab = (TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
7454 ? umul_widen_optab : smul_widen_optab);
7455 if (mode == GET_MODE_WIDER_MODE (innermode))
7457 if (this_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing)
7459 op0 = expand_expr (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
7460 NULL_RTX, VOIDmode, 0);
7461 if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST)
7462 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX,
7465 op1 = expand_expr (TREE_OPERAND (TREE_OPERAND (exp, 1), 0),
7466 NULL_RTX, VOIDmode, 0);
7469 else if (other_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing
7470 && innermode == word_mode)
7473 op0 = expand_expr (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
7474 NULL_RTX, VOIDmode, 0);
7475 if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST)
7476 op1 = convert_modes (innermode, mode,
7477 expand_expr (TREE_OPERAND (exp, 1),
7478 NULL_RTX, VOIDmode, 0),
7481 op1 = expand_expr (TREE_OPERAND (TREE_OPERAND (exp, 1), 0),
7482 NULL_RTX, VOIDmode, 0);
7483 temp = expand_binop (mode, other_optab, op0, op1, target,
7484 unsignedp, OPTAB_LIB_WIDEN);
7485 htem = expand_mult_highpart_adjust (innermode,
7486 gen_highpart (innermode, temp),
7488 gen_highpart (innermode, temp),
7490 emit_move_insn (gen_highpart (innermode, temp), htem);
7495 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7496 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
7497 return expand_mult (mode, op0, op1, target, unsignedp);
7499 case TRUNC_DIV_EXPR:
7500 case FLOOR_DIV_EXPR:
7502 case ROUND_DIV_EXPR:
7503 case EXACT_DIV_EXPR:
7504 preexpand_calls (exp);
7505 if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
7507 /* Possible optimization: compute the dividend with EXPAND_SUM
7508 then if the divisor is constant can optimize the case
7509 where some terms of the dividend have coeffs divisible by it. */
7510 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7511 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
7512 return expand_divmod (0, code, mode, op0, op1, target, unsignedp);
7515 this_optab = flodiv_optab;
7518 case TRUNC_MOD_EXPR:
7519 case FLOOR_MOD_EXPR:
7521 case ROUND_MOD_EXPR:
7522 preexpand_calls (exp);
7523 if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
7525 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7526 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
7527 return expand_divmod (1, code, mode, op0, op1, target, unsignedp);
7529 case FIX_ROUND_EXPR:
7530 case FIX_FLOOR_EXPR:
7532 abort (); /* Not used for C. */
7534 case FIX_TRUNC_EXPR:
7535 op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
7537 target = gen_reg_rtx (mode);
7538 expand_fix (target, op0, unsignedp);
7542 op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
7544 target = gen_reg_rtx (mode);
7545 /* expand_float can't figure out what to do if FROM has VOIDmode.
7546 So give it the correct mode. With -O, cse will optimize this. */
7547 if (GET_MODE (op0) == VOIDmode)
7548 op0 = copy_to_mode_reg (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))),
7550 expand_float (target, op0,
7551 TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
7555 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7556 temp = expand_unop (mode, neg_optab, op0, target, 0);
7562 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7564 /* Handle complex values specially. */
7565 if (GET_MODE_CLASS (mode) == MODE_COMPLEX_INT
7566 || GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT)
7567 return expand_complex_abs (mode, op0, target, unsignedp);
7569 /* Unsigned abs is simply the operand. Testing here means we don't
7570 risk generating incorrect code below. */
7571 if (TREE_UNSIGNED (type))
7574 return expand_abs (mode, op0, target,
7575 safe_from_p (target, TREE_OPERAND (exp, 0), 1));
7579 target = original_target;
7580 if (target == 0 || ! safe_from_p (target, TREE_OPERAND (exp, 1), 1)
7581 || (GET_CODE (target) == MEM && MEM_VOLATILE_P (target))
7582 || GET_MODE (target) != mode
7583 || (GET_CODE (target) == REG
7584 && REGNO (target) < FIRST_PSEUDO_REGISTER))
7585 target = gen_reg_rtx (mode);
7586 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
7587 op0 = expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode, 0);
7589 /* First try to do it with a special MIN or MAX instruction.
7590 If that does not win, use a conditional jump to select the proper
7592 this_optab = (TREE_UNSIGNED (type)
7593 ? (code == MIN_EXPR ? umin_optab : umax_optab)
7594 : (code == MIN_EXPR ? smin_optab : smax_optab));
7596 temp = expand_binop (mode, this_optab, op0, op1, target, unsignedp,
7601 /* At this point, a MEM target is no longer useful; we will get better
7604 if (GET_CODE (target) == MEM)
7605 target = gen_reg_rtx (mode);
7608 emit_move_insn (target, op0);
7610 op0 = gen_label_rtx ();
7612 /* If this mode is an integer too wide to compare properly,
7613 compare word by word. Rely on cse to optimize constant cases. */
7614 if (GET_MODE_CLASS (mode) == MODE_INT
7615 && ! can_compare_p (GE, mode, ccp_jump))
7617 if (code == MAX_EXPR)
7618 do_jump_by_parts_greater_rtx (mode, TREE_UNSIGNED (type),
7619 target, op1, NULL_RTX, op0);
7621 do_jump_by_parts_greater_rtx (mode, TREE_UNSIGNED (type),
7622 op1, target, NULL_RTX, op0);
7626 int unsignedp = TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 1)));
7627 do_compare_rtx_and_jump (target, op1, code == MAX_EXPR ? GE : LE,
7628 unsignedp, mode, NULL_RTX, 0, NULL_RTX,
7631 emit_move_insn (target, op1);
7636 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7637 temp = expand_unop (mode, one_cmpl_optab, op0, target, 1);
7643 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7644 temp = expand_unop (mode, ffs_optab, op0, target, 1);
7649 /* ??? Can optimize bitwise operations with one arg constant.
7650 Can optimize (a bitwise1 n) bitwise2 (a bitwise3 b)
7651 and (a bitwise1 b) bitwise2 b (etc)
7652 but that is probably not worth while. */
7654 /* BIT_AND_EXPR is for bitwise anding. TRUTH_AND_EXPR is for anding two
7655 boolean values when we want in all cases to compute both of them. In
7656 general it is fastest to do TRUTH_AND_EXPR by computing both operands
7657 as actual zero-or-1 values and then bitwise anding. In cases where
7658 there cannot be any side effects, better code would be made by
7659 treating TRUTH_AND_EXPR like TRUTH_ANDIF_EXPR; but the question is
7660 how to recognize those cases. */
7662 case TRUTH_AND_EXPR:
7664 this_optab = and_optab;
7669 this_optab = ior_optab;
7672 case TRUTH_XOR_EXPR:
7674 this_optab = xor_optab;
7681 preexpand_calls (exp);
7682 if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
7684 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
7685 return expand_shift (code, mode, op0, TREE_OPERAND (exp, 1), target,
7688 /* Could determine the answer when only additive constants differ. Also,
7689 the addition of one can be handled by changing the condition. */
7696 case UNORDERED_EXPR:
7703 preexpand_calls (exp);
7704 temp = do_store_flag (exp, target, tmode != VOIDmode ? tmode : mode, 0);
7708 /* For foo != 0, load foo, and if it is nonzero load 1 instead. */
7709 if (code == NE_EXPR && integer_zerop (TREE_OPERAND (exp, 1))
7711 && GET_CODE (original_target) == REG
7712 && (GET_MODE (original_target)
7713 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))))
7715 temp = expand_expr (TREE_OPERAND (exp, 0), original_target,
7718 if (temp != original_target)
7719 temp = copy_to_reg (temp);
7721 op1 = gen_label_rtx ();
7722 emit_cmp_and_jump_insns (temp, const0_rtx, EQ, NULL_RTX,
7723 GET_MODE (temp), unsignedp, 0, op1);
7724 emit_move_insn (temp, const1_rtx);
7729 /* If no set-flag instruction, must generate a conditional
7730 store into a temporary variable. Drop through
7731 and handle this like && and ||. */
7733 case TRUTH_ANDIF_EXPR:
7734 case TRUTH_ORIF_EXPR:
7736 && (target == 0 || ! safe_from_p (target, exp, 1)
7737 /* Make sure we don't have a hard reg (such as function's return
7738 value) live across basic blocks, if not optimizing. */
7739 || (!optimize && GET_CODE (target) == REG
7740 && REGNO (target) < FIRST_PSEUDO_REGISTER)))
7741 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
7744 emit_clr_insn (target);
7746 op1 = gen_label_rtx ();
7747 jumpifnot (exp, op1);
7750 emit_0_to_1_insn (target);
7753 return ignore ? const0_rtx : target;
7755 case TRUTH_NOT_EXPR:
7756 op0 = expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode, 0);
7757 /* The parser is careful to generate TRUTH_NOT_EXPR
7758 only with operands that are always zero or one. */
7759 temp = expand_binop (mode, xor_optab, op0, const1_rtx,
7760 target, 1, OPTAB_LIB_WIDEN);
7766 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0);
7768 return expand_expr (TREE_OPERAND (exp, 1),
7769 (ignore ? const0_rtx : target),
7773 /* If we would have a "singleton" (see below) were it not for a
7774 conversion in each arm, bring that conversion back out. */
7775 if (TREE_CODE (TREE_OPERAND (exp, 1)) == NOP_EXPR
7776 && TREE_CODE (TREE_OPERAND (exp, 2)) == NOP_EXPR
7777 && (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 1), 0))
7778 == TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 2), 0))))
7780 tree true = TREE_OPERAND (TREE_OPERAND (exp, 1), 0);
7781 tree false = TREE_OPERAND (TREE_OPERAND (exp, 2), 0);
7783 if ((TREE_CODE_CLASS (TREE_CODE (true)) == '2'
7784 && operand_equal_p (false, TREE_OPERAND (true, 0), 0))
7785 || (TREE_CODE_CLASS (TREE_CODE (false)) == '2'
7786 && operand_equal_p (true, TREE_OPERAND (false, 0), 0))
7787 || (TREE_CODE_CLASS (TREE_CODE (true)) == '1'
7788 && operand_equal_p (false, TREE_OPERAND (true, 0), 0))
7789 || (TREE_CODE_CLASS (TREE_CODE (false)) == '1'
7790 && operand_equal_p (true, TREE_OPERAND (false, 0), 0)))
7791 return expand_expr (build1 (NOP_EXPR, type,
7792 build (COND_EXPR, TREE_TYPE (true),
7793 TREE_OPERAND (exp, 0),
7795 target, tmode, modifier);
7799 /* Note that COND_EXPRs whose type is a structure or union
7800 are required to be constructed to contain assignments of
7801 a temporary variable, so that we can evaluate them here
7802 for side effect only. If type is void, we must do likewise. */
7804 /* If an arm of the branch requires a cleanup,
7805 only that cleanup is performed. */
7808 tree binary_op = 0, unary_op = 0;
7810 /* If this is (A ? 1 : 0) and A is a condition, just evaluate it and
7811 convert it to our mode, if necessary. */
7812 if (integer_onep (TREE_OPERAND (exp, 1))
7813 && integer_zerop (TREE_OPERAND (exp, 2))
7814 && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<')
7818 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode,
7823 op0 = expand_expr (TREE_OPERAND (exp, 0), target, mode, ro_modifier);
7824 if (GET_MODE (op0) == mode)
7828 target = gen_reg_rtx (mode);
7829 convert_move (target, op0, unsignedp);
7833 /* Check for X ? A + B : A. If we have this, we can copy A to the
7834 output and conditionally add B. Similarly for unary operations.
7835 Don't do this if X has side-effects because those side effects
7836 might affect A or B and the "?" operation is a sequence point in
7837 ANSI. (operand_equal_p tests for side effects.) */
7839 if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 1))) == '2'
7840 && operand_equal_p (TREE_OPERAND (exp, 2),
7841 TREE_OPERAND (TREE_OPERAND (exp, 1), 0), 0))
7842 singleton = TREE_OPERAND (exp, 2), binary_op = TREE_OPERAND (exp, 1);
7843 else if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 2))) == '2'
7844 && operand_equal_p (TREE_OPERAND (exp, 1),
7845 TREE_OPERAND (TREE_OPERAND (exp, 2), 0), 0))
7846 singleton = TREE_OPERAND (exp, 1), binary_op = TREE_OPERAND (exp, 2);
7847 else if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 1))) == '1'
7848 && operand_equal_p (TREE_OPERAND (exp, 2),
7849 TREE_OPERAND (TREE_OPERAND (exp, 1), 0), 0))
7850 singleton = TREE_OPERAND (exp, 2), unary_op = TREE_OPERAND (exp, 1);
7851 else if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 2))) == '1'
7852 && operand_equal_p (TREE_OPERAND (exp, 1),
7853 TREE_OPERAND (TREE_OPERAND (exp, 2), 0), 0))
7854 singleton = TREE_OPERAND (exp, 1), unary_op = TREE_OPERAND (exp, 2);
7856 /* If we are not to produce a result, we have no target. Otherwise,
7857 if a target was specified use it; it will not be used as an
7858 intermediate target unless it is safe. If no target, use a
7863 else if (original_target
7864 && (safe_from_p (original_target, TREE_OPERAND (exp, 0), 1)
7865 || (singleton && GET_CODE (original_target) == REG
7866 && REGNO (original_target) >= FIRST_PSEUDO_REGISTER
7867 && original_target == var_rtx (singleton)))
7868 && GET_MODE (original_target) == mode
7869 #ifdef HAVE_conditional_move
7870 && (! can_conditionally_move_p (mode)
7871 || GET_CODE (original_target) == REG
7872 || TREE_ADDRESSABLE (type))
7874 && ! (GET_CODE (original_target) == MEM
7875 && MEM_VOLATILE_P (original_target)))
7876 temp = original_target;
7877 else if (TREE_ADDRESSABLE (type))
7880 temp = assign_temp (type, 0, 0, 1);
7882 /* If we had X ? A + C : A, with C a constant power of 2, and we can
7883 do the test of X as a store-flag operation, do this as
7884 A + ((X != 0) << log C). Similarly for other simple binary
7885 operators. Only do for C == 1 if BRANCH_COST is low. */
7886 if (temp && singleton && binary_op
7887 && (TREE_CODE (binary_op) == PLUS_EXPR
7888 || TREE_CODE (binary_op) == MINUS_EXPR
7889 || TREE_CODE (binary_op) == BIT_IOR_EXPR
7890 || TREE_CODE (binary_op) == BIT_XOR_EXPR)
7891 && (BRANCH_COST >= 3 ? integer_pow2p (TREE_OPERAND (binary_op, 1))
7892 : integer_onep (TREE_OPERAND (binary_op, 1)))
7893 && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<')
7896 optab boptab = (TREE_CODE (binary_op) == PLUS_EXPR ? add_optab
7897 : TREE_CODE (binary_op) == MINUS_EXPR ? sub_optab
7898 : TREE_CODE (binary_op) == BIT_IOR_EXPR ? ior_optab
7901 /* If we had X ? A : A + 1, do this as A + (X == 0).
7903 We have to invert the truth value here and then put it
7904 back later if do_store_flag fails. We cannot simply copy
7905 TREE_OPERAND (exp, 0) to another variable and modify that
7906 because invert_truthvalue can modify the tree pointed to
7908 if (singleton == TREE_OPERAND (exp, 1))
7909 TREE_OPERAND (exp, 0)
7910 = invert_truthvalue (TREE_OPERAND (exp, 0));
7912 result = do_store_flag (TREE_OPERAND (exp, 0),
7913 (safe_from_p (temp, singleton, 1)
7915 mode, BRANCH_COST <= 1);
7917 if (result != 0 && ! integer_onep (TREE_OPERAND (binary_op, 1)))
7918 result = expand_shift (LSHIFT_EXPR, mode, result,
7919 build_int_2 (tree_log2
7923 (safe_from_p (temp, singleton, 1)
7924 ? temp : NULL_RTX), 0);
7928 op1 = expand_expr (singleton, NULL_RTX, VOIDmode, 0);
7929 return expand_binop (mode, boptab, op1, result, temp,
7930 unsignedp, OPTAB_LIB_WIDEN);
7932 else if (singleton == TREE_OPERAND (exp, 1))
7933 TREE_OPERAND (exp, 0)
7934 = invert_truthvalue (TREE_OPERAND (exp, 0));
7937 do_pending_stack_adjust ();
7939 op0 = gen_label_rtx ();
7941 if (singleton && ! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0)))
7945 /* If the target conflicts with the other operand of the
7946 binary op, we can't use it. Also, we can't use the target
7947 if it is a hard register, because evaluating the condition
7948 might clobber it. */
7950 && ! safe_from_p (temp, TREE_OPERAND (binary_op, 1), 1))
7951 || (GET_CODE (temp) == REG
7952 && REGNO (temp) < FIRST_PSEUDO_REGISTER))
7953 temp = gen_reg_rtx (mode);
7954 store_expr (singleton, temp, 0);
7957 expand_expr (singleton,
7958 ignore ? const0_rtx : NULL_RTX, VOIDmode, 0);
7959 if (singleton == TREE_OPERAND (exp, 1))
7960 jumpif (TREE_OPERAND (exp, 0), op0);
7962 jumpifnot (TREE_OPERAND (exp, 0), op0);
7964 start_cleanup_deferral ();
7965 if (binary_op && temp == 0)
7966 /* Just touch the other operand. */
7967 expand_expr (TREE_OPERAND (binary_op, 1),
7968 ignore ? const0_rtx : NULL_RTX, VOIDmode, 0);
7970 store_expr (build (TREE_CODE (binary_op), type,
7971 make_tree (type, temp),
7972 TREE_OPERAND (binary_op, 1)),
7975 store_expr (build1 (TREE_CODE (unary_op), type,
7976 make_tree (type, temp)),
7980 /* Check for A op 0 ? A : FOO and A op 0 ? FOO : A where OP is any
7981 comparison operator. If we have one of these cases, set the
7982 output to A, branch on A (cse will merge these two references),
7983 then set the output to FOO. */
7985 && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<'
7986 && integer_zerop (TREE_OPERAND (TREE_OPERAND (exp, 0), 1))
7987 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
7988 TREE_OPERAND (exp, 1), 0)
7989 && (! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0))
7990 || TREE_CODE (TREE_OPERAND (exp, 1)) == SAVE_EXPR)
7991 && safe_from_p (temp, TREE_OPERAND (exp, 2), 1))
7993 if (GET_CODE (temp) == REG
7994 && REGNO (temp) < FIRST_PSEUDO_REGISTER)
7995 temp = gen_reg_rtx (mode);
7996 store_expr (TREE_OPERAND (exp, 1), temp, 0);
7997 jumpif (TREE_OPERAND (exp, 0), op0);
7999 start_cleanup_deferral ();
8000 store_expr (TREE_OPERAND (exp, 2), temp, 0);
8004 && TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == '<'
8005 && integer_zerop (TREE_OPERAND (TREE_OPERAND (exp, 0), 1))
8006 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
8007 TREE_OPERAND (exp, 2), 0)
8008 && (! TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 0))
8009 || TREE_CODE (TREE_OPERAND (exp, 2)) == SAVE_EXPR)
8010 && safe_from_p (temp, TREE_OPERAND (exp, 1), 1))
8012 if (GET_CODE (temp) == REG
8013 && REGNO (temp) < FIRST_PSEUDO_REGISTER)
8014 temp = gen_reg_rtx (mode);
8015 store_expr (TREE_OPERAND (exp, 2), temp, 0);
8016 jumpifnot (TREE_OPERAND (exp, 0), op0);
8018 start_cleanup_deferral ();
8019 store_expr (TREE_OPERAND (exp, 1), temp, 0);
8024 op1 = gen_label_rtx ();
8025 jumpifnot (TREE_OPERAND (exp, 0), op0);
8027 start_cleanup_deferral ();
8029 /* One branch of the cond can be void, if it never returns. For
8030 example A ? throw : E */
8032 && TREE_TYPE (TREE_OPERAND (exp, 1)) != void_type_node)
8033 store_expr (TREE_OPERAND (exp, 1), temp, 0);
8035 expand_expr (TREE_OPERAND (exp, 1),
8036 ignore ? const0_rtx : NULL_RTX, VOIDmode, 0);
8037 end_cleanup_deferral ();
8039 emit_jump_insn (gen_jump (op1));
8042 start_cleanup_deferral ();
8044 && TREE_TYPE (TREE_OPERAND (exp, 2)) != void_type_node)
8045 store_expr (TREE_OPERAND (exp, 2), temp, 0);
8047 expand_expr (TREE_OPERAND (exp, 2),
8048 ignore ? const0_rtx : NULL_RTX, VOIDmode, 0);
8051 end_cleanup_deferral ();
8062 /* Something needs to be initialized, but we didn't know
8063 where that thing was when building the tree. For example,
8064 it could be the return value of a function, or a parameter
8065 to a function which lays down in the stack, or a temporary
8066 variable which must be passed by reference.
8068 We guarantee that the expression will either be constructed
8069 or copied into our original target. */
8071 tree slot = TREE_OPERAND (exp, 0);
8072 tree cleanups = NULL_TREE;
8075 if (TREE_CODE (slot) != VAR_DECL)
8079 target = original_target;
8081 /* Set this here so that if we get a target that refers to a
8082 register variable that's already been used, put_reg_into_stack
8083 knows that it should fix up those uses. */
8084 TREE_USED (slot) = 1;
8088 if (DECL_RTL (slot) != 0)
8090 target = DECL_RTL (slot);
8091 /* If we have already expanded the slot, so don't do
8093 if (TREE_OPERAND (exp, 1) == NULL_TREE)
8098 target = assign_temp (type, 2, 0, 1);
8099 /* All temp slots at this level must not conflict. */
8100 preserve_temp_slots (target);
8101 DECL_RTL (slot) = target;
8102 if (TREE_ADDRESSABLE (slot))
8104 TREE_ADDRESSABLE (slot) = 0;
8105 mark_addressable (slot);
8108 /* Since SLOT is not known to the called function
8109 to belong to its stack frame, we must build an explicit
8110 cleanup. This case occurs when we must build up a reference
8111 to pass the reference as an argument. In this case,
8112 it is very likely that such a reference need not be
8115 if (TREE_OPERAND (exp, 2) == 0)
8116 TREE_OPERAND (exp, 2) = maybe_build_cleanup (slot);
8117 cleanups = TREE_OPERAND (exp, 2);
8122 /* This case does occur, when expanding a parameter which
8123 needs to be constructed on the stack. The target
8124 is the actual stack address that we want to initialize.
8125 The function we call will perform the cleanup in this case. */
8127 /* If we have already assigned it space, use that space,
8128 not target that we were passed in, as our target
8129 parameter is only a hint. */
8130 if (DECL_RTL (slot) != 0)
8132 target = DECL_RTL (slot);
8133 /* If we have already expanded the slot, so don't do
8135 if (TREE_OPERAND (exp, 1) == NULL_TREE)
8140 DECL_RTL (slot) = target;
8141 /* If we must have an addressable slot, then make sure that
8142 the RTL that we just stored in slot is OK. */
8143 if (TREE_ADDRESSABLE (slot))
8145 TREE_ADDRESSABLE (slot) = 0;
8146 mark_addressable (slot);
8151 exp1 = TREE_OPERAND (exp, 3) = TREE_OPERAND (exp, 1);
8152 /* Mark it as expanded. */
8153 TREE_OPERAND (exp, 1) = NULL_TREE;
8155 store_expr (exp1, target, 0);
8157 expand_decl_cleanup (NULL_TREE, cleanups);
8164 tree lhs = TREE_OPERAND (exp, 0);
8165 tree rhs = TREE_OPERAND (exp, 1);
8166 tree noncopied_parts = 0;
8167 tree lhs_type = TREE_TYPE (lhs);
8169 temp = expand_assignment (lhs, rhs, ! ignore, original_target != 0);
8170 if (TYPE_NONCOPIED_PARTS (lhs_type) != 0 && !fixed_type_p (rhs))
8171 noncopied_parts = init_noncopied_parts (stabilize_reference (lhs),
8172 TYPE_NONCOPIED_PARTS (lhs_type));
8173 while (noncopied_parts != 0)
8175 expand_assignment (TREE_VALUE (noncopied_parts),
8176 TREE_PURPOSE (noncopied_parts), 0, 0);
8177 noncopied_parts = TREE_CHAIN (noncopied_parts);
8184 /* If lhs is complex, expand calls in rhs before computing it.
8185 That's so we don't compute a pointer and save it over a call.
8186 If lhs is simple, compute it first so we can give it as a
8187 target if the rhs is just a call. This avoids an extra temp and copy
8188 and that prevents a partial-subsumption which makes bad code.
8189 Actually we could treat component_ref's of vars like vars. */
8191 tree lhs = TREE_OPERAND (exp, 0);
8192 tree rhs = TREE_OPERAND (exp, 1);
8193 tree noncopied_parts = 0;
8194 tree lhs_type = TREE_TYPE (lhs);
8198 if (TREE_CODE (lhs) != VAR_DECL
8199 && TREE_CODE (lhs) != RESULT_DECL
8200 && TREE_CODE (lhs) != PARM_DECL
8201 && ! (TREE_CODE (lhs) == INDIRECT_REF
8202 && TYPE_READONLY (TREE_TYPE (TREE_OPERAND (lhs, 0)))))
8203 preexpand_calls (exp);
8205 /* Check for |= or &= of a bitfield of size one into another bitfield
8206 of size 1. In this case, (unless we need the result of the
8207 assignment) we can do this more efficiently with a
8208 test followed by an assignment, if necessary.
8210 ??? At this point, we can't get a BIT_FIELD_REF here. But if
8211 things change so we do, this code should be enhanced to
8214 && TREE_CODE (lhs) == COMPONENT_REF
8215 && (TREE_CODE (rhs) == BIT_IOR_EXPR
8216 || TREE_CODE (rhs) == BIT_AND_EXPR)
8217 && TREE_OPERAND (rhs, 0) == lhs
8218 && TREE_CODE (TREE_OPERAND (rhs, 1)) == COMPONENT_REF
8219 && integer_onep (DECL_SIZE (TREE_OPERAND (lhs, 1)))
8220 && integer_onep (DECL_SIZE (TREE_OPERAND (TREE_OPERAND (rhs, 1), 1))))
8222 rtx label = gen_label_rtx ();
8224 do_jump (TREE_OPERAND (rhs, 1),
8225 TREE_CODE (rhs) == BIT_IOR_EXPR ? label : 0,
8226 TREE_CODE (rhs) == BIT_AND_EXPR ? label : 0);
8227 expand_assignment (lhs, convert (TREE_TYPE (rhs),
8228 (TREE_CODE (rhs) == BIT_IOR_EXPR
8230 : integer_zero_node)),
8232 do_pending_stack_adjust ();
8237 if (TYPE_NONCOPIED_PARTS (lhs_type) != 0
8238 && ! (fixed_type_p (lhs) && fixed_type_p (rhs)))
8239 noncopied_parts = save_noncopied_parts (stabilize_reference (lhs),
8240 TYPE_NONCOPIED_PARTS (lhs_type));
8242 temp = expand_assignment (lhs, rhs, ! ignore, original_target != 0);
8243 while (noncopied_parts != 0)
8245 expand_assignment (TREE_PURPOSE (noncopied_parts),
8246 TREE_VALUE (noncopied_parts), 0, 0);
8247 noncopied_parts = TREE_CHAIN (noncopied_parts);
8253 if (!TREE_OPERAND (exp, 0))
8254 expand_null_return ();
8256 expand_return (TREE_OPERAND (exp, 0));
8259 case PREINCREMENT_EXPR:
8260 case PREDECREMENT_EXPR:
8261 return expand_increment (exp, 0, ignore);
8263 case POSTINCREMENT_EXPR:
8264 case POSTDECREMENT_EXPR:
8265 /* Faster to treat as pre-increment if result is not used. */
8266 return expand_increment (exp, ! ignore, ignore);
8269 /* If nonzero, TEMP will be set to the address of something that might
8270 be a MEM corresponding to a stack slot. */
8273 /* Are we taking the address of a nested function? */
8274 if (TREE_CODE (TREE_OPERAND (exp, 0)) == FUNCTION_DECL
8275 && decl_function_context (TREE_OPERAND (exp, 0)) != 0
8276 && ! DECL_NO_STATIC_CHAIN (TREE_OPERAND (exp, 0))
8277 && ! TREE_STATIC (exp))
8279 op0 = trampoline_address (TREE_OPERAND (exp, 0));
8280 op0 = force_operand (op0, target);
8282 /* If we are taking the address of something erroneous, just
8284 else if (TREE_CODE (TREE_OPERAND (exp, 0)) == ERROR_MARK)
8288 /* We make sure to pass const0_rtx down if we came in with
8289 ignore set, to avoid doing the cleanups twice for something. */
8290 op0 = expand_expr (TREE_OPERAND (exp, 0),
8291 ignore ? const0_rtx : NULL_RTX, VOIDmode,
8292 (modifier == EXPAND_INITIALIZER
8293 ? modifier : EXPAND_CONST_ADDRESS));
8295 /* If we are going to ignore the result, OP0 will have been set
8296 to const0_rtx, so just return it. Don't get confused and
8297 think we are taking the address of the constant. */
8301 op0 = protect_from_queue (op0, 0);
8303 /* We would like the object in memory. If it is a constant, we can
8304 have it be statically allocated into memory. For a non-constant,
8305 we need to allocate some memory and store the value into it. */
8307 if (CONSTANT_P (op0))
8308 op0 = force_const_mem (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))),
8310 else if (GET_CODE (op0) == MEM)
8312 mark_temp_addr_taken (op0);
8313 temp = XEXP (op0, 0);
8316 else if (GET_CODE (op0) == REG || GET_CODE (op0) == SUBREG
8317 || GET_CODE (op0) == CONCAT || GET_CODE (op0) == ADDRESSOF)
8319 /* If this object is in a register, it must be not
8321 tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
8322 rtx memloc = assign_temp (inner_type, 1, 1, 1);
8324 mark_temp_addr_taken (memloc);
8325 emit_move_insn (memloc, op0);
8329 if (GET_CODE (op0) != MEM)
8332 if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
8334 temp = XEXP (op0, 0);
8335 #ifdef POINTERS_EXTEND_UNSIGNED
8336 if (GET_MODE (temp) == Pmode && GET_MODE (temp) != mode
8337 && mode == ptr_mode)
8338 temp = convert_memory_address (ptr_mode, temp);
8343 op0 = force_operand (XEXP (op0, 0), target);
8346 if (flag_force_addr && GET_CODE (op0) != REG)
8347 op0 = force_reg (Pmode, op0);
8349 if (GET_CODE (op0) == REG
8350 && ! REG_USERVAR_P (op0))
8351 mark_reg_pointer (op0, TYPE_ALIGN (TREE_TYPE (type)));
8353 /* If we might have had a temp slot, add an equivalent address
8356 update_temp_slot_address (temp, op0);
8358 #ifdef POINTERS_EXTEND_UNSIGNED
8359 if (GET_MODE (op0) == Pmode && GET_MODE (op0) != mode
8360 && mode == ptr_mode)
8361 op0 = convert_memory_address (ptr_mode, op0);
8366 case ENTRY_VALUE_EXPR:
8369 /* COMPLEX type for Extended Pascal & Fortran */
8372 enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
8375 /* Get the rtx code of the operands. */
8376 op0 = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0);
8377 op1 = expand_expr (TREE_OPERAND (exp, 1), 0, VOIDmode, 0);
8380 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
8384 /* Move the real (op0) and imaginary (op1) parts to their location. */
8385 emit_move_insn (gen_realpart (mode, target), op0);
8386 emit_move_insn (gen_imagpart (mode, target), op1);
8388 insns = get_insns ();
8391 /* Complex construction should appear as a single unit. */
8392 /* If TARGET is a CONCAT, we got insns like RD = RS, ID = IS,
8393 each with a separate pseudo as destination.
8394 It's not correct for flow to treat them as a unit. */
8395 if (GET_CODE (target) != CONCAT)
8396 emit_no_conflict_block (insns, target, op0, op1, NULL_RTX);
8404 op0 = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0);
8405 return gen_realpart (mode, op0);
8408 op0 = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0);
8409 return gen_imagpart (mode, op0);
8413 enum machine_mode partmode = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
8417 op0 = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0);
8420 target = gen_reg_rtx (mode);
8424 /* Store the realpart and the negated imagpart to target. */
8425 emit_move_insn (gen_realpart (partmode, target),
8426 gen_realpart (partmode, op0));
8428 imag_t = gen_imagpart (partmode, target);
8429 temp = expand_unop (partmode, neg_optab,
8430 gen_imagpart (partmode, op0), imag_t, 0);
8432 emit_move_insn (imag_t, temp);
8434 insns = get_insns ();
8437 /* Conjugate should appear as a single unit
8438 If TARGET is a CONCAT, we got insns like RD = RS, ID = - IS,
8439 each with a separate pseudo as destination.
8440 It's not correct for flow to treat them as a unit. */
8441 if (GET_CODE (target) != CONCAT)
8442 emit_no_conflict_block (insns, target, op0, NULL_RTX, NULL_RTX);
8449 case TRY_CATCH_EXPR:
8451 tree handler = TREE_OPERAND (exp, 1);
8453 expand_eh_region_start ();
8455 op0 = expand_expr (TREE_OPERAND (exp, 0), 0, VOIDmode, 0);
8457 expand_eh_region_end (handler);
8462 case TRY_FINALLY_EXPR:
8464 tree try_block = TREE_OPERAND (exp, 0);
8465 tree finally_block = TREE_OPERAND (exp, 1);
8466 rtx finally_label = gen_label_rtx ();
8467 rtx done_label = gen_label_rtx ();
8468 rtx return_link = gen_reg_rtx (Pmode);
8469 tree cleanup = build (GOTO_SUBROUTINE_EXPR, void_type_node,
8470 (tree) finally_label, (tree) return_link);
8471 TREE_SIDE_EFFECTS (cleanup) = 1;
8473 /* Start a new binding layer that will keep track of all cleanup
8474 actions to be performed. */
8475 expand_start_bindings (2);
8477 target_temp_slot_level = temp_slot_level;
8479 expand_decl_cleanup (NULL_TREE, cleanup);
8480 op0 = expand_expr (try_block, target, tmode, modifier);
8482 preserve_temp_slots (op0);
8483 expand_end_bindings (NULL_TREE, 0, 0);
8484 emit_jump (done_label);
8485 emit_label (finally_label);
8486 expand_expr (finally_block, const0_rtx, VOIDmode, 0);
8487 emit_indirect_jump (return_link);
8488 emit_label (done_label);
8492 case GOTO_SUBROUTINE_EXPR:
8494 rtx subr = (rtx) TREE_OPERAND (exp, 0);
8495 rtx return_link = *(rtx *) &TREE_OPERAND (exp, 1);
8496 rtx return_address = gen_label_rtx ();
8497 emit_move_insn (return_link,
8498 gen_rtx_LABEL_REF (Pmode, return_address));
8500 emit_label (return_address);
8506 rtx dcc = get_dynamic_cleanup_chain ();
8507 emit_move_insn (dcc, validize_mem (gen_rtx_MEM (Pmode, dcc)));
8513 rtx dhc = get_dynamic_handler_chain ();
8514 emit_move_insn (dhc, validize_mem (gen_rtx_MEM (Pmode, dhc)));
8519 return expand_builtin_va_arg (TREE_OPERAND (exp, 0), type);
8522 return (*lang_expand_expr) (exp, original_target, tmode, modifier);
8525 /* Here to do an ordinary binary operator, generating an instruction
8526 from the optab already placed in `this_optab'. */
8528 preexpand_calls (exp);
8529 if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
8531 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
8532 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
8534 temp = expand_binop (mode, this_optab, op0, op1, target,
8535 unsignedp, OPTAB_LIB_WIDEN);
8541 /* Similar to expand_expr, except that we don't specify a target, target
8542 mode, or modifier and we return the alignment of the inner type. This is
8543 used in cases where it is not necessary to align the result to the
8544 alignment of its type as long as we know the alignment of the result, for
8545 example for comparisons of BLKmode values. */
8548 expand_expr_unaligned (exp, palign)
8550 unsigned int *palign;
8553 tree type = TREE_TYPE (exp);
8554 register enum machine_mode mode = TYPE_MODE (type);
8556 /* Default the alignment we return to that of the type. */
8557 *palign = TYPE_ALIGN (type);
8559 /* The only cases in which we do anything special is if the resulting mode
8561 if (mode != BLKmode)
8562 return expand_expr (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL);
8564 switch (TREE_CODE (exp))
8568 case NON_LVALUE_EXPR:
8569 /* Conversions between BLKmode values don't change the underlying
8570 alignment or value. */
8571 if (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == BLKmode)
8572 return expand_expr_unaligned (TREE_OPERAND (exp, 0), palign);
8576 /* Much of the code for this case is copied directly from expand_expr.
8577 We need to duplicate it here because we will do something different
8578 in the fall-through case, so we need to handle the same exceptions
8581 tree array = TREE_OPERAND (exp, 0);
8582 tree domain = TYPE_DOMAIN (TREE_TYPE (array));
8583 tree low_bound = domain ? TYPE_MIN_VALUE (domain) : integer_zero_node;
8584 tree index = convert (sizetype, TREE_OPERAND (exp, 1));
8587 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) != ARRAY_TYPE)
8590 /* Optimize the special-case of a zero lower bound.
8592 We convert the low_bound to sizetype to avoid some problems
8593 with constant folding. (E.g. suppose the lower bound is 1,
8594 and its mode is QI. Without the conversion, (ARRAY
8595 +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1))
8596 +INDEX), which becomes (ARRAY+255+INDEX). Oops!) */
8598 if (! integer_zerop (low_bound))
8599 index = size_diffop (index, convert (sizetype, low_bound));
8601 /* If this is a constant index into a constant array,
8602 just get the value from the array. Handle both the cases when
8603 we have an explicit constructor and when our operand is a variable
8604 that was declared const. */
8606 if (TREE_CODE (array) == CONSTRUCTOR && ! TREE_SIDE_EFFECTS (array)
8607 && 0 > compare_tree_int (index,
8608 list_length (CONSTRUCTOR_ELTS
8609 (TREE_OPERAND (exp, 0)))))
8613 for (elem = CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0)),
8614 i = TREE_INT_CST_LOW (index);
8615 elem != 0 && i != 0; i--, elem = TREE_CHAIN (elem))
8619 return expand_expr_unaligned (fold (TREE_VALUE (elem)), palign);
8622 else if (optimize >= 1
8623 && TREE_READONLY (array) && ! TREE_SIDE_EFFECTS (array)
8624 && TREE_CODE (array) == VAR_DECL && DECL_INITIAL (array)
8625 && TREE_CODE (DECL_INITIAL (array)) != ERROR_MARK)
8627 if (TREE_CODE (index) == INTEGER_CST)
8629 tree init = DECL_INITIAL (array);
8631 if (TREE_CODE (init) == CONSTRUCTOR)
8635 for (elem = CONSTRUCTOR_ELTS (init);
8636 ! tree_int_cst_equal (TREE_PURPOSE (elem), index);
8637 elem = TREE_CHAIN (elem))
8641 return expand_expr_unaligned (fold (TREE_VALUE (elem)),
8651 /* If the operand is a CONSTRUCTOR, we can just extract the
8652 appropriate field if it is present. Don't do this if we have
8653 already written the data since we want to refer to that copy
8654 and varasm.c assumes that's what we'll do. */
8655 if (TREE_CODE (exp) != ARRAY_REF
8656 && TREE_CODE (TREE_OPERAND (exp, 0)) == CONSTRUCTOR
8657 && TREE_CST_RTL (TREE_OPERAND (exp, 0)) == 0)
8661 for (elt = CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0)); elt;
8662 elt = TREE_CHAIN (elt))
8663 if (TREE_PURPOSE (elt) == TREE_OPERAND (exp, 1))
8664 /* Note that unlike the case in expand_expr, we know this is
8665 BLKmode and hence not an integer. */
8666 return expand_expr_unaligned (TREE_VALUE (elt), palign);
8670 enum machine_mode mode1;
8671 HOST_WIDE_INT bitsize, bitpos;
8674 unsigned int alignment;
8676 tree tem = get_inner_reference (exp, &bitsize, &bitpos, &offset,
8677 &mode1, &unsignedp, &volatilep,
8680 /* If we got back the original object, something is wrong. Perhaps
8681 we are evaluating an expression too early. In any event, don't
8682 infinitely recurse. */
8686 op0 = expand_expr (tem, NULL_RTX, VOIDmode, EXPAND_NORMAL);
8688 /* If this is a constant, put it into a register if it is a
8689 legitimate constant and OFFSET is 0 and memory if it isn't. */
8690 if (CONSTANT_P (op0))
8692 enum machine_mode inner_mode = TYPE_MODE (TREE_TYPE (tem));
8694 if (inner_mode != BLKmode && LEGITIMATE_CONSTANT_P (op0)
8696 op0 = force_reg (inner_mode, op0);
8698 op0 = validize_mem (force_const_mem (inner_mode, op0));
8703 rtx offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, 0);
8705 /* If this object is in a register, put it into memory.
8706 This case can't occur in C, but can in Ada if we have
8707 unchecked conversion of an expression from a scalar type to
8708 an array or record type. */
8709 if (GET_CODE (op0) == REG || GET_CODE (op0) == SUBREG
8710 || GET_CODE (op0) == CONCAT || GET_CODE (op0) == ADDRESSOF)
8712 rtx memloc = assign_temp (TREE_TYPE (tem), 1, 1, 1);
8714 mark_temp_addr_taken (memloc);
8715 emit_move_insn (memloc, op0);
8719 if (GET_CODE (op0) != MEM)
8722 if (GET_MODE (offset_rtx) != ptr_mode)
8724 #ifdef POINTERS_EXTEND_UNSIGNED
8725 offset_rtx = convert_memory_address (ptr_mode, offset_rtx);
8727 offset_rtx = convert_to_mode (ptr_mode, offset_rtx, 0);
8731 op0 = change_address (op0, VOIDmode,
8732 gen_rtx_PLUS (ptr_mode, XEXP (op0, 0),
8733 force_reg (ptr_mode,
8737 /* Don't forget about volatility even if this is a bitfield. */
8738 if (GET_CODE (op0) == MEM && volatilep && ! MEM_VOLATILE_P (op0))
8740 op0 = copy_rtx (op0);
8741 MEM_VOLATILE_P (op0) = 1;
8744 /* Check the access. */
8745 if (current_function_check_memory_usage && GET_CODE (op0) == MEM)
8750 to = plus_constant (XEXP (op0, 0), (bitpos / BITS_PER_UNIT));
8751 size = (bitpos % BITS_PER_UNIT) + bitsize + BITS_PER_UNIT - 1;
8753 /* Check the access right of the pointer. */
8754 in_check_memory_usage = 1;
8755 if (size > BITS_PER_UNIT)
8756 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
8757 to, ptr_mode, GEN_INT (size / BITS_PER_UNIT),
8758 TYPE_MODE (sizetype),
8759 GEN_INT (MEMORY_USE_RO),
8760 TYPE_MODE (integer_type_node));
8761 in_check_memory_usage = 0;
8764 /* In cases where an aligned union has an unaligned object
8765 as a field, we might be extracting a BLKmode value from
8766 an integer-mode (e.g., SImode) object. Handle this case
8767 by doing the extract into an object as wide as the field
8768 (which we know to be the width of a basic mode), then
8769 storing into memory, and changing the mode to BLKmode.
8770 If we ultimately want the address (EXPAND_CONST_ADDRESS or
8771 EXPAND_INITIALIZER), then we must not copy to a temporary. */
8772 if (mode1 == VOIDmode
8773 || GET_CODE (op0) == REG || GET_CODE (op0) == SUBREG
8774 || (SLOW_UNALIGNED_ACCESS (mode1, alignment)
8775 && (TYPE_ALIGN (type) > alignment
8776 || bitpos % TYPE_ALIGN (type) != 0)))
8778 enum machine_mode ext_mode = mode_for_size (bitsize, MODE_INT, 1);
8780 if (ext_mode == BLKmode)
8782 /* In this case, BITPOS must start at a byte boundary. */
8783 if (GET_CODE (op0) != MEM
8784 || bitpos % BITS_PER_UNIT != 0)
8787 op0 = change_address (op0, VOIDmode,
8788 plus_constant (XEXP (op0, 0),
8789 bitpos / BITS_PER_UNIT));
8793 rtx new = assign_stack_temp (ext_mode,
8794 bitsize / BITS_PER_UNIT, 0);
8796 op0 = extract_bit_field (validize_mem (op0), bitsize, bitpos,
8797 unsignedp, NULL_RTX, ext_mode,
8798 ext_mode, alignment,
8799 int_size_in_bytes (TREE_TYPE (tem)));
8801 /* If the result is a record type and BITSIZE is narrower than
8802 the mode of OP0, an integral mode, and this is a big endian
8803 machine, we must put the field into the high-order bits. */
8804 if (TREE_CODE (type) == RECORD_TYPE && BYTES_BIG_ENDIAN
8805 && GET_MODE_CLASS (GET_MODE (op0)) == MODE_INT
8806 && bitsize < GET_MODE_BITSIZE (GET_MODE (op0)))
8807 op0 = expand_shift (LSHIFT_EXPR, GET_MODE (op0), op0,
8808 size_int (GET_MODE_BITSIZE
8813 emit_move_insn (new, op0);
8814 op0 = copy_rtx (new);
8815 PUT_MODE (op0, BLKmode);
8819 /* Get a reference to just this component. */
8820 op0 = change_address (op0, mode1,
8821 plus_constant (XEXP (op0, 0),
8822 (bitpos / BITS_PER_UNIT)));
8824 MEM_ALIAS_SET (op0) = get_alias_set (exp);
8826 /* Adjust the alignment in case the bit position is not
8827 a multiple of the alignment of the inner object. */
8828 while (bitpos % alignment != 0)
8831 if (GET_CODE (XEXP (op0, 0)) == REG)
8832 mark_reg_pointer (XEXP (op0, 0), alignment);
8834 MEM_IN_STRUCT_P (op0) = 1;
8835 MEM_VOLATILE_P (op0) |= volatilep;
8837 *palign = alignment;
8846 return expand_expr (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL);
8849 /* Return the tree node if a ARG corresponds to a string constant or zero
8850 if it doesn't. If we return non-zero, set *PTR_OFFSET to the offset
8851 in bytes within the string that ARG is accessing. The type of the
8852 offset will be `sizetype'. */
8855 string_constant (arg, ptr_offset)
8861 if (TREE_CODE (arg) == ADDR_EXPR
8862 && TREE_CODE (TREE_OPERAND (arg, 0)) == STRING_CST)
8864 *ptr_offset = size_zero_node;
8865 return TREE_OPERAND (arg, 0);
8867 else if (TREE_CODE (arg) == PLUS_EXPR)
8869 tree arg0 = TREE_OPERAND (arg, 0);
8870 tree arg1 = TREE_OPERAND (arg, 1);
8875 if (TREE_CODE (arg0) == ADDR_EXPR
8876 && TREE_CODE (TREE_OPERAND (arg0, 0)) == STRING_CST)
8878 *ptr_offset = convert (sizetype, arg1);
8879 return TREE_OPERAND (arg0, 0);
8881 else if (TREE_CODE (arg1) == ADDR_EXPR
8882 && TREE_CODE (TREE_OPERAND (arg1, 0)) == STRING_CST)
8884 *ptr_offset = convert (sizetype, arg0);
8885 return TREE_OPERAND (arg1, 0);
8892 /* Expand code for a post- or pre- increment or decrement
8893 and return the RTX for the result.
8894 POST is 1 for postinc/decrements and 0 for preinc/decrements. */
8897 expand_increment (exp, post, ignore)
8901 register rtx op0, op1;
8902 register rtx temp, value;
8903 register tree incremented = TREE_OPERAND (exp, 0);
8904 optab this_optab = add_optab;
8906 enum machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
8907 int op0_is_copy = 0;
8908 int single_insn = 0;
8909 /* 1 means we can't store into OP0 directly,
8910 because it is a subreg narrower than a word,
8911 and we don't dare clobber the rest of the word. */
8914 /* Stabilize any component ref that might need to be
8915 evaluated more than once below. */
8917 || TREE_CODE (incremented) == BIT_FIELD_REF
8918 || (TREE_CODE (incremented) == COMPONENT_REF
8919 && (TREE_CODE (TREE_OPERAND (incremented, 0)) != INDIRECT_REF
8920 || DECL_BIT_FIELD (TREE_OPERAND (incremented, 1)))))
8921 incremented = stabilize_reference (incremented);
8922 /* Nested *INCREMENT_EXPRs can happen in C++. We must force innermost
8923 ones into save exprs so that they don't accidentally get evaluated
8924 more than once by the code below. */
8925 if (TREE_CODE (incremented) == PREINCREMENT_EXPR
8926 || TREE_CODE (incremented) == PREDECREMENT_EXPR)
8927 incremented = save_expr (incremented);
8929 /* Compute the operands as RTX.
8930 Note whether OP0 is the actual lvalue or a copy of it:
8931 I believe it is a copy iff it is a register or subreg
8932 and insns were generated in computing it. */
8934 temp = get_last_insn ();
8935 op0 = expand_expr (incremented, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_RW);
8937 /* If OP0 is a SUBREG made for a promoted variable, we cannot increment
8938 in place but instead must do sign- or zero-extension during assignment,
8939 so we copy it into a new register and let the code below use it as
8942 Note that we can safely modify this SUBREG since it is know not to be
8943 shared (it was made by the expand_expr call above). */
8945 if (GET_CODE (op0) == SUBREG && SUBREG_PROMOTED_VAR_P (op0))
8948 SUBREG_REG (op0) = copy_to_reg (SUBREG_REG (op0));
8952 else if (GET_CODE (op0) == SUBREG
8953 && GET_MODE_BITSIZE (GET_MODE (op0)) < BITS_PER_WORD)
8955 /* We cannot increment this SUBREG in place. If we are
8956 post-incrementing, get a copy of the old value. Otherwise,
8957 just mark that we cannot increment in place. */
8959 op0 = copy_to_reg (op0);
8964 op0_is_copy = ((GET_CODE (op0) == SUBREG || GET_CODE (op0) == REG)
8965 && temp != get_last_insn ());
8966 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode,
8967 EXPAND_MEMORY_USE_BAD);
8969 /* Decide whether incrementing or decrementing. */
8970 if (TREE_CODE (exp) == POSTDECREMENT_EXPR
8971 || TREE_CODE (exp) == PREDECREMENT_EXPR)
8972 this_optab = sub_optab;
8974 /* Convert decrement by a constant into a negative increment. */
8975 if (this_optab == sub_optab
8976 && GET_CODE (op1) == CONST_INT)
8978 op1 = GEN_INT (-INTVAL (op1));
8979 this_optab = add_optab;
8982 /* For a preincrement, see if we can do this with a single instruction. */
8985 icode = (int) this_optab->handlers[(int) mode].insn_code;
8986 if (icode != (int) CODE_FOR_nothing
8987 /* Make sure that OP0 is valid for operands 0 and 1
8988 of the insn we want to queue. */
8989 && (*insn_data[icode].operand[0].predicate) (op0, mode)
8990 && (*insn_data[icode].operand[1].predicate) (op0, mode)
8991 && (*insn_data[icode].operand[2].predicate) (op1, mode))
8995 /* If OP0 is not the actual lvalue, but rather a copy in a register,
8996 then we cannot just increment OP0. We must therefore contrive to
8997 increment the original value. Then, for postincrement, we can return
8998 OP0 since it is a copy of the old value. For preincrement, expand here
8999 unless we can do it with a single insn.
9001 Likewise if storing directly into OP0 would clobber high bits
9002 we need to preserve (bad_subreg). */
9003 if (op0_is_copy || (!post && !single_insn) || bad_subreg)
9005 /* This is the easiest way to increment the value wherever it is.
9006 Problems with multiple evaluation of INCREMENTED are prevented
9007 because either (1) it is a component_ref or preincrement,
9008 in which case it was stabilized above, or (2) it is an array_ref
9009 with constant index in an array in a register, which is
9010 safe to reevaluate. */
9011 tree newexp = build (((TREE_CODE (exp) == POSTDECREMENT_EXPR
9012 || TREE_CODE (exp) == PREDECREMENT_EXPR)
9013 ? MINUS_EXPR : PLUS_EXPR),
9016 TREE_OPERAND (exp, 1));
9018 while (TREE_CODE (incremented) == NOP_EXPR
9019 || TREE_CODE (incremented) == CONVERT_EXPR)
9021 newexp = convert (TREE_TYPE (incremented), newexp);
9022 incremented = TREE_OPERAND (incremented, 0);
9025 temp = expand_assignment (incremented, newexp, ! post && ! ignore , 0);
9026 return post ? op0 : temp;
9031 /* We have a true reference to the value in OP0.
9032 If there is an insn to add or subtract in this mode, queue it.
9033 Queueing the increment insn avoids the register shuffling
9034 that often results if we must increment now and first save
9035 the old value for subsequent use. */
9037 #if 0 /* Turned off to avoid making extra insn for indexed memref. */
9038 op0 = stabilize (op0);
9041 icode = (int) this_optab->handlers[(int) mode].insn_code;
9042 if (icode != (int) CODE_FOR_nothing
9043 /* Make sure that OP0 is valid for operands 0 and 1
9044 of the insn we want to queue. */
9045 && (*insn_data[icode].operand[0].predicate) (op0, mode)
9046 && (*insn_data[icode].operand[1].predicate) (op0, mode))
9048 if (! (*insn_data[icode].operand[2].predicate) (op1, mode))
9049 op1 = force_reg (mode, op1);
9051 return enqueue_insn (op0, GEN_FCN (icode) (op0, op0, op1));
9053 if (icode != (int) CODE_FOR_nothing && GET_CODE (op0) == MEM)
9055 rtx addr = (general_operand (XEXP (op0, 0), mode)
9056 ? force_reg (Pmode, XEXP (op0, 0))
9057 : copy_to_reg (XEXP (op0, 0)));
9060 op0 = change_address (op0, VOIDmode, addr);
9061 temp = force_reg (GET_MODE (op0), op0);
9062 if (! (*insn_data[icode].operand[2].predicate) (op1, mode))
9063 op1 = force_reg (mode, op1);
9065 /* The increment queue is LIFO, thus we have to `queue'
9066 the instructions in reverse order. */
9067 enqueue_insn (op0, gen_move_insn (op0, temp));
9068 result = enqueue_insn (temp, GEN_FCN (icode) (temp, temp, op1));
9073 /* Preincrement, or we can't increment with one simple insn. */
9075 /* Save a copy of the value before inc or dec, to return it later. */
9076 temp = value = copy_to_reg (op0);
9078 /* Arrange to return the incremented value. */
9079 /* Copy the rtx because expand_binop will protect from the queue,
9080 and the results of that would be invalid for us to return
9081 if our caller does emit_queue before using our result. */
9082 temp = copy_rtx (value = op0);
9084 /* Increment however we can. */
9085 op1 = expand_binop (mode, this_optab, value, op1,
9086 current_function_check_memory_usage ? NULL_RTX : op0,
9087 TREE_UNSIGNED (TREE_TYPE (exp)), OPTAB_LIB_WIDEN);
9088 /* Make sure the value is stored into OP0. */
9090 emit_move_insn (op0, op1);
9095 /* Expand all function calls contained within EXP, innermost ones first.
9096 But don't look within expressions that have sequence points.
9097 For each CALL_EXPR, record the rtx for its value
9098 in the CALL_EXPR_RTL field. */
9101 preexpand_calls (exp)
9104 register int nops, i;
9105 int class = TREE_CODE_CLASS (TREE_CODE (exp));
9107 if (! do_preexpand_calls)
9110 /* Only expressions and references can contain calls. */
9112 if (! IS_EXPR_CODE_CLASS (class) && class != 'r')
9115 switch (TREE_CODE (exp))
9118 /* Do nothing if already expanded. */
9119 if (CALL_EXPR_RTL (exp) != 0
9120 /* Do nothing if the call returns a variable-sized object. */
9121 || (TREE_CODE (TREE_TYPE (exp)) != VOID_TYPE
9122 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) != INTEGER_CST)
9123 /* Do nothing to built-in functions. */
9124 || (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
9125 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
9127 && DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))))
9130 CALL_EXPR_RTL (exp) = expand_call (exp, NULL_RTX, 0);
9135 case TRUTH_ANDIF_EXPR:
9136 case TRUTH_ORIF_EXPR:
9137 /* If we find one of these, then we can be sure
9138 the adjust will be done for it (since it makes jumps).
9139 Do it now, so that if this is inside an argument
9140 of a function, we don't get the stack adjustment
9141 after some other args have already been pushed. */
9142 do_pending_stack_adjust ();
9147 case WITH_CLEANUP_EXPR:
9148 case CLEANUP_POINT_EXPR:
9149 case TRY_CATCH_EXPR:
9153 if (SAVE_EXPR_RTL (exp) != 0)
9160 nops = TREE_CODE_LENGTH (TREE_CODE (exp));
9161 for (i = 0; i < nops; i++)
9162 if (TREE_OPERAND (exp, i) != 0)
9164 if (TREE_CODE (exp) == TARGET_EXPR && i == 2)
9165 /* We don't need to preexpand the cleanup for a TARGET_EXPR.
9166 It doesn't happen before the call is made. */
9170 class = TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, i)));
9171 if (IS_EXPR_CODE_CLASS (class) || class == 'r')
9172 preexpand_calls (TREE_OPERAND (exp, i));
9177 /* At the start of a function, record that we have no previously-pushed
9178 arguments waiting to be popped. */
9181 init_pending_stack_adjust ()
9183 pending_stack_adjust = 0;
9186 /* When exiting from function, if safe, clear out any pending stack adjust
9187 so the adjustment won't get done.
9189 Note, if the current function calls alloca, then it must have a
9190 frame pointer regardless of the value of flag_omit_frame_pointer. */
9193 clear_pending_stack_adjust ()
9195 #ifdef EXIT_IGNORE_STACK
9197 && (! flag_omit_frame_pointer || current_function_calls_alloca)
9198 && EXIT_IGNORE_STACK
9199 && ! (DECL_INLINE (current_function_decl) && ! flag_no_inline)
9200 && ! flag_inline_functions)
9202 stack_pointer_delta -= pending_stack_adjust,
9203 pending_stack_adjust = 0;
9208 /* Pop any previously-pushed arguments that have not been popped yet. */
9211 do_pending_stack_adjust ()
9213 if (inhibit_defer_pop == 0)
9215 if (pending_stack_adjust != 0)
9216 adjust_stack (GEN_INT (pending_stack_adjust));
9217 pending_stack_adjust = 0;
9221 /* Expand conditional expressions. */
9223 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.
9224 LABEL is an rtx of code CODE_LABEL, in this function and all the
9228 jumpifnot (exp, label)
9232 do_jump (exp, label, NULL_RTX);
9235 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
9242 do_jump (exp, NULL_RTX, label);
9245 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
9246 the result is zero, or IF_TRUE_LABEL if the result is one.
9247 Either of IF_FALSE_LABEL and IF_TRUE_LABEL may be zero,
9248 meaning fall through in that case.
9250 do_jump always does any pending stack adjust except when it does not
9251 actually perform a jump. An example where there is no jump
9252 is when EXP is `(foo (), 0)' and IF_FALSE_LABEL is null.
9254 This function is responsible for optimizing cases such as
9255 &&, || and comparison operators in EXP. */
9258 do_jump (exp, if_false_label, if_true_label)
9260 rtx if_false_label, if_true_label;
9262 register enum tree_code code = TREE_CODE (exp);
9263 /* Some cases need to create a label to jump to
9264 in order to properly fall through.
9265 These cases set DROP_THROUGH_LABEL nonzero. */
9266 rtx drop_through_label = 0;
9270 enum machine_mode mode;
9272 #ifdef MAX_INTEGER_COMPUTATION_MODE
9273 check_max_integer_computation_mode (exp);
9284 temp = integer_zerop (exp) ? if_false_label : if_true_label;
9290 /* This is not true with #pragma weak */
9292 /* The address of something can never be zero. */
9294 emit_jump (if_true_label);
9299 if (TREE_CODE (TREE_OPERAND (exp, 0)) == COMPONENT_REF
9300 || TREE_CODE (TREE_OPERAND (exp, 0)) == BIT_FIELD_REF
9301 || TREE_CODE (TREE_OPERAND (exp, 0)) == ARRAY_REF)
9304 /* If we are narrowing the operand, we have to do the compare in the
9306 if ((TYPE_PRECISION (TREE_TYPE (exp))
9307 < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp, 0)))))
9309 case NON_LVALUE_EXPR:
9310 case REFERENCE_EXPR:
9315 /* These cannot change zero->non-zero or vice versa. */
9316 do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
9319 case WITH_RECORD_EXPR:
9320 /* Put the object on the placeholder list, recurse through our first
9321 operand, and pop the list. */
9322 placeholder_list = tree_cons (TREE_OPERAND (exp, 1), NULL_TREE,
9324 do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
9325 placeholder_list = TREE_CHAIN (placeholder_list);
9329 /* This is never less insns than evaluating the PLUS_EXPR followed by
9330 a test and can be longer if the test is eliminated. */
9332 /* Reduce to minus. */
9333 exp = build (MINUS_EXPR, TREE_TYPE (exp),
9334 TREE_OPERAND (exp, 0),
9335 fold (build1 (NEGATE_EXPR, TREE_TYPE (TREE_OPERAND (exp, 1)),
9336 TREE_OPERAND (exp, 1))));
9337 /* Process as MINUS. */
9341 /* Non-zero iff operands of minus differ. */
9342 do_compare_and_jump (build (NE_EXPR, TREE_TYPE (exp),
9343 TREE_OPERAND (exp, 0),
9344 TREE_OPERAND (exp, 1)),
9345 NE, NE, if_false_label, if_true_label);
9349 /* If we are AND'ing with a small constant, do this comparison in the
9350 smallest type that fits. If the machine doesn't have comparisons
9351 that small, it will be converted back to the wider comparison.
9352 This helps if we are testing the sign bit of a narrower object.
9353 combine can't do this for us because it can't know whether a
9354 ZERO_EXTRACT or a compare in a smaller mode exists, but we do. */
9356 if (! SLOW_BYTE_ACCESS
9357 && TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
9358 && TYPE_PRECISION (TREE_TYPE (exp)) <= HOST_BITS_PER_WIDE_INT
9359 && (i = tree_floor_log2 (TREE_OPERAND (exp, 1))) >= 0
9360 && (mode = mode_for_size (i + 1, MODE_INT, 0)) != BLKmode
9361 && (type = type_for_mode (mode, 1)) != 0
9362 && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (exp))
9363 && (cmp_optab->handlers[(int) TYPE_MODE (type)].insn_code
9364 != CODE_FOR_nothing))
9366 do_jump (convert (type, exp), if_false_label, if_true_label);
9371 case TRUTH_NOT_EXPR:
9372 do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label);
9375 case TRUTH_ANDIF_EXPR:
9376 if (if_false_label == 0)
9377 if_false_label = drop_through_label = gen_label_rtx ();
9378 do_jump (TREE_OPERAND (exp, 0), if_false_label, NULL_RTX);
9379 start_cleanup_deferral ();
9380 do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
9381 end_cleanup_deferral ();
9384 case TRUTH_ORIF_EXPR:
9385 if (if_true_label == 0)
9386 if_true_label = drop_through_label = gen_label_rtx ();
9387 do_jump (TREE_OPERAND (exp, 0), NULL_RTX, if_true_label);
9388 start_cleanup_deferral ();
9389 do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
9390 end_cleanup_deferral ();
9395 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0);
9396 preserve_temp_slots (NULL_RTX);
9400 do_pending_stack_adjust ();
9401 do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
9408 HOST_WIDE_INT bitsize, bitpos;
9410 enum machine_mode mode;
9414 unsigned int alignment;
9416 /* Get description of this reference. We don't actually care
9417 about the underlying object here. */
9418 get_inner_reference (exp, &bitsize, &bitpos, &offset, &mode,
9419 &unsignedp, &volatilep, &alignment);
9421 type = type_for_size (bitsize, unsignedp);
9422 if (! SLOW_BYTE_ACCESS
9423 && type != 0 && bitsize >= 0
9424 && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (exp))
9425 && (cmp_optab->handlers[(int) TYPE_MODE (type)].insn_code
9426 != CODE_FOR_nothing))
9428 do_jump (convert (type, exp), if_false_label, if_true_label);
9435 /* Do (a ? 1 : 0) and (a ? 0 : 1) as special cases. */
9436 if (integer_onep (TREE_OPERAND (exp, 1))
9437 && integer_zerop (TREE_OPERAND (exp, 2)))
9438 do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
9440 else if (integer_zerop (TREE_OPERAND (exp, 1))
9441 && integer_onep (TREE_OPERAND (exp, 2)))
9442 do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label);
9446 register rtx label1 = gen_label_rtx ();
9447 drop_through_label = gen_label_rtx ();
9449 do_jump (TREE_OPERAND (exp, 0), label1, NULL_RTX);
9451 start_cleanup_deferral ();
9452 /* Now the THEN-expression. */
9453 do_jump (TREE_OPERAND (exp, 1),
9454 if_false_label ? if_false_label : drop_through_label,
9455 if_true_label ? if_true_label : drop_through_label);
9456 /* In case the do_jump just above never jumps. */
9457 do_pending_stack_adjust ();
9458 emit_label (label1);
9460 /* Now the ELSE-expression. */
9461 do_jump (TREE_OPERAND (exp, 2),
9462 if_false_label ? if_false_label : drop_through_label,
9463 if_true_label ? if_true_label : drop_through_label);
9464 end_cleanup_deferral ();
9470 tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
9472 if (GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_COMPLEX_FLOAT
9473 || GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_COMPLEX_INT)
9475 tree exp0 = save_expr (TREE_OPERAND (exp, 0));
9476 tree exp1 = save_expr (TREE_OPERAND (exp, 1));
9479 (build (TRUTH_ANDIF_EXPR, TREE_TYPE (exp),
9480 fold (build (EQ_EXPR, TREE_TYPE (exp),
9481 fold (build1 (REALPART_EXPR,
9482 TREE_TYPE (inner_type),
9484 fold (build1 (REALPART_EXPR,
9485 TREE_TYPE (inner_type),
9487 fold (build (EQ_EXPR, TREE_TYPE (exp),
9488 fold (build1 (IMAGPART_EXPR,
9489 TREE_TYPE (inner_type),
9491 fold (build1 (IMAGPART_EXPR,
9492 TREE_TYPE (inner_type),
9494 if_false_label, if_true_label);
9497 else if (integer_zerop (TREE_OPERAND (exp, 1)))
9498 do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label);
9500 else if (GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_INT
9501 && !can_compare_p (EQ, TYPE_MODE (inner_type), ccp_jump))
9502 do_jump_by_parts_equality (exp, if_false_label, if_true_label);
9504 do_compare_and_jump (exp, EQ, EQ, if_false_label, if_true_label);
9510 tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
9512 if (GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_COMPLEX_FLOAT
9513 || GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_COMPLEX_INT)
9515 tree exp0 = save_expr (TREE_OPERAND (exp, 0));
9516 tree exp1 = save_expr (TREE_OPERAND (exp, 1));
9519 (build (TRUTH_ORIF_EXPR, TREE_TYPE (exp),
9520 fold (build (NE_EXPR, TREE_TYPE (exp),
9521 fold (build1 (REALPART_EXPR,
9522 TREE_TYPE (inner_type),
9524 fold (build1 (REALPART_EXPR,
9525 TREE_TYPE (inner_type),
9527 fold (build (NE_EXPR, TREE_TYPE (exp),
9528 fold (build1 (IMAGPART_EXPR,
9529 TREE_TYPE (inner_type),
9531 fold (build1 (IMAGPART_EXPR,
9532 TREE_TYPE (inner_type),
9534 if_false_label, if_true_label);
9537 else if (integer_zerop (TREE_OPERAND (exp, 1)))
9538 do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
9540 else if (GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_INT
9541 && !can_compare_p (NE, TYPE_MODE (inner_type), ccp_jump))
9542 do_jump_by_parts_equality (exp, if_true_label, if_false_label);
9544 do_compare_and_jump (exp, NE, NE, if_false_label, if_true_label);
9549 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9550 if (GET_MODE_CLASS (mode) == MODE_INT
9551 && ! can_compare_p (LT, mode, ccp_jump))
9552 do_jump_by_parts_greater (exp, 1, if_false_label, if_true_label);
9554 do_compare_and_jump (exp, LT, LTU, if_false_label, if_true_label);
9558 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9559 if (GET_MODE_CLASS (mode) == MODE_INT
9560 && ! can_compare_p (LE, mode, ccp_jump))
9561 do_jump_by_parts_greater (exp, 0, if_true_label, if_false_label);
9563 do_compare_and_jump (exp, LE, LEU, if_false_label, if_true_label);
9567 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9568 if (GET_MODE_CLASS (mode) == MODE_INT
9569 && ! can_compare_p (GT, mode, ccp_jump))
9570 do_jump_by_parts_greater (exp, 0, if_false_label, if_true_label);
9572 do_compare_and_jump (exp, GT, GTU, if_false_label, if_true_label);
9576 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9577 if (GET_MODE_CLASS (mode) == MODE_INT
9578 && ! can_compare_p (GE, mode, ccp_jump))
9579 do_jump_by_parts_greater (exp, 1, if_true_label, if_false_label);
9581 do_compare_and_jump (exp, GE, GEU, if_false_label, if_true_label);
9584 case UNORDERED_EXPR:
9587 enum rtx_code cmp, rcmp;
9590 if (code == UNORDERED_EXPR)
9591 cmp = UNORDERED, rcmp = ORDERED;
9593 cmp = ORDERED, rcmp = UNORDERED;
9594 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9597 if (! can_compare_p (cmp, mode, ccp_jump)
9598 && (can_compare_p (rcmp, mode, ccp_jump)
9599 /* If the target doesn't provide either UNORDERED or ORDERED
9600 comparisons, canonicalize on UNORDERED for the library. */
9601 || rcmp == UNORDERED))
9605 do_compare_and_jump (exp, cmp, cmp, if_false_label, if_true_label);
9607 do_compare_and_jump (exp, rcmp, rcmp, if_true_label, if_false_label);
9612 enum rtx_code rcode1;
9613 enum tree_code tcode2;
9637 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9638 if (can_compare_p (rcode1, mode, ccp_jump))
9639 do_compare_and_jump (exp, rcode1, rcode1, if_false_label,
9643 tree op0 = save_expr (TREE_OPERAND (exp, 0));
9644 tree op1 = save_expr (TREE_OPERAND (exp, 1));
9647 /* If the target doesn't support combined unordered
9648 compares, decompose into UNORDERED + comparison. */
9649 cmp0 = fold (build (UNORDERED_EXPR, TREE_TYPE (exp), op0, op1));
9650 cmp1 = fold (build (tcode2, TREE_TYPE (exp), op0, op1));
9651 exp = build (TRUTH_ORIF_EXPR, TREE_TYPE (exp), cmp0, cmp1);
9652 do_jump (exp, if_false_label, if_true_label);
9659 temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);
9661 /* This is not needed any more and causes poor code since it causes
9662 comparisons and tests from non-SI objects to have different code
9664 /* Copy to register to avoid generating bad insns by cse
9665 from (set (mem ...) (arithop)) (set (cc0) (mem ...)). */
9666 if (!cse_not_expected && GET_CODE (temp) == MEM)
9667 temp = copy_to_reg (temp);
9669 do_pending_stack_adjust ();
9670 /* Do any postincrements in the expression that was tested. */
9673 if (GET_CODE (temp) == CONST_INT || GET_CODE (temp) == LABEL_REF)
9675 rtx target = temp == const0_rtx ? if_false_label : if_true_label;
9679 else if (GET_MODE_CLASS (GET_MODE (temp)) == MODE_INT
9680 && ! can_compare_p (NE, GET_MODE (temp), ccp_jump))
9681 /* Note swapping the labels gives us not-equal. */
9682 do_jump_by_parts_equality_rtx (temp, if_true_label, if_false_label);
9683 else if (GET_MODE (temp) != VOIDmode)
9684 do_compare_rtx_and_jump (temp, CONST0_RTX (GET_MODE (temp)),
9685 NE, TREE_UNSIGNED (TREE_TYPE (exp)),
9686 GET_MODE (temp), NULL_RTX, 0,
9687 if_false_label, if_true_label);
9692 if (drop_through_label)
9694 /* If do_jump produces code that might be jumped around,
9695 do any stack adjusts from that code, before the place
9696 where control merges in. */
9697 do_pending_stack_adjust ();
9698 emit_label (drop_through_label);
9702 /* Given a comparison expression EXP for values too wide to be compared
9703 with one insn, test the comparison and jump to the appropriate label.
9704 The code of EXP is ignored; we always test GT if SWAP is 0,
9705 and LT if SWAP is 1. */
9708 do_jump_by_parts_greater (exp, swap, if_false_label, if_true_label)
9711 rtx if_false_label, if_true_label;
9713 rtx op0 = expand_expr (TREE_OPERAND (exp, swap), NULL_RTX, VOIDmode, 0);
9714 rtx op1 = expand_expr (TREE_OPERAND (exp, !swap), NULL_RTX, VOIDmode, 0);
9715 enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9716 int unsignedp = TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0)));
9718 do_jump_by_parts_greater_rtx (mode, unsignedp, op0, op1, if_false_label, if_true_label);
9721 /* Compare OP0 with OP1, word at a time, in mode MODE.
9722 UNSIGNEDP says to do unsigned comparison.
9723 Jump to IF_TRUE_LABEL if OP0 is greater, IF_FALSE_LABEL otherwise. */
9726 do_jump_by_parts_greater_rtx (mode, unsignedp, op0, op1, if_false_label, if_true_label)
9727 enum machine_mode mode;
9730 rtx if_false_label, if_true_label;
9732 int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD);
9733 rtx drop_through_label = 0;
9736 if (! if_true_label || ! if_false_label)
9737 drop_through_label = gen_label_rtx ();
9738 if (! if_true_label)
9739 if_true_label = drop_through_label;
9740 if (! if_false_label)
9741 if_false_label = drop_through_label;
9743 /* Compare a word at a time, high order first. */
9744 for (i = 0; i < nwords; i++)
9746 rtx op0_word, op1_word;
9748 if (WORDS_BIG_ENDIAN)
9750 op0_word = operand_subword_force (op0, i, mode);
9751 op1_word = operand_subword_force (op1, i, mode);
9755 op0_word = operand_subword_force (op0, nwords - 1 - i, mode);
9756 op1_word = operand_subword_force (op1, nwords - 1 - i, mode);
9759 /* All but high-order word must be compared as unsigned. */
9760 do_compare_rtx_and_jump (op0_word, op1_word, GT,
9761 (unsignedp || i > 0), word_mode, NULL_RTX, 0,
9762 NULL_RTX, if_true_label);
9764 /* Consider lower words only if these are equal. */
9765 do_compare_rtx_and_jump (op0_word, op1_word, NE, unsignedp, word_mode,
9766 NULL_RTX, 0, NULL_RTX, if_false_label);
9770 emit_jump (if_false_label);
9771 if (drop_through_label)
9772 emit_label (drop_through_label);
9775 /* Given an EQ_EXPR expression EXP for values too wide to be compared
9776 with one insn, test the comparison and jump to the appropriate label. */
9779 do_jump_by_parts_equality (exp, if_false_label, if_true_label)
9781 rtx if_false_label, if_true_label;
9783 rtx op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
9784 rtx op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
9785 enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9786 int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD);
9788 rtx drop_through_label = 0;
9790 if (! if_false_label)
9791 drop_through_label = if_false_label = gen_label_rtx ();
9793 for (i = 0; i < nwords; i++)
9794 do_compare_rtx_and_jump (operand_subword_force (op0, i, mode),
9795 operand_subword_force (op1, i, mode),
9796 EQ, TREE_UNSIGNED (TREE_TYPE (exp)),
9797 word_mode, NULL_RTX, 0, if_false_label,
9801 emit_jump (if_true_label);
9802 if (drop_through_label)
9803 emit_label (drop_through_label);
9806 /* Jump according to whether OP0 is 0.
9807 We assume that OP0 has an integer mode that is too wide
9808 for the available compare insns. */
9811 do_jump_by_parts_equality_rtx (op0, if_false_label, if_true_label)
9813 rtx if_false_label, if_true_label;
9815 int nwords = GET_MODE_SIZE (GET_MODE (op0)) / UNITS_PER_WORD;
9818 rtx drop_through_label = 0;
9820 /* The fastest way of doing this comparison on almost any machine is to
9821 "or" all the words and compare the result. If all have to be loaded
9822 from memory and this is a very wide item, it's possible this may
9823 be slower, but that's highly unlikely. */
9825 part = gen_reg_rtx (word_mode);
9826 emit_move_insn (part, operand_subword_force (op0, 0, GET_MODE (op0)));
9827 for (i = 1; i < nwords && part != 0; i++)
9828 part = expand_binop (word_mode, ior_optab, part,
9829 operand_subword_force (op0, i, GET_MODE (op0)),
9830 part, 1, OPTAB_WIDEN);
9834 do_compare_rtx_and_jump (part, const0_rtx, EQ, 1, word_mode,
9835 NULL_RTX, 0, if_false_label, if_true_label);
9840 /* If we couldn't do the "or" simply, do this with a series of compares. */
9841 if (! if_false_label)
9842 drop_through_label = if_false_label = gen_label_rtx ();
9844 for (i = 0; i < nwords; i++)
9845 do_compare_rtx_and_jump (operand_subword_force (op0, i, GET_MODE (op0)),
9846 const0_rtx, EQ, 1, word_mode, NULL_RTX, 0,
9847 if_false_label, NULL_RTX);
9850 emit_jump (if_true_label);
9852 if (drop_through_label)
9853 emit_label (drop_through_label);
9856 /* Generate code for a comparison of OP0 and OP1 with rtx code CODE.
9857 (including code to compute the values to be compared)
9858 and set (CC0) according to the result.
9859 The decision as to signed or unsigned comparison must be made by the caller.
9861 We force a stack adjustment unless there are currently
9862 things pushed on the stack that aren't yet used.
9864 If MODE is BLKmode, SIZE is an RTX giving the size of the objects being
9867 If ALIGN is non-zero, it is the alignment of this type; if zero, the
9868 size of MODE should be used. */
9871 compare_from_rtx (op0, op1, code, unsignedp, mode, size, align)
9872 register rtx op0, op1;
9875 enum machine_mode mode;
9881 /* If one operand is constant, make it the second one. Only do this
9882 if the other operand is not constant as well. */
9884 if ((CONSTANT_P (op0) && ! CONSTANT_P (op1))
9885 || (GET_CODE (op0) == CONST_INT && GET_CODE (op1) != CONST_INT))
9890 code = swap_condition (code);
9895 op0 = force_not_mem (op0);
9896 op1 = force_not_mem (op1);
9899 do_pending_stack_adjust ();
9901 if (GET_CODE (op0) == CONST_INT && GET_CODE (op1) == CONST_INT
9902 && (tem = simplify_relational_operation (code, mode, op0, op1)) != 0)
9906 /* There's no need to do this now that combine.c can eliminate lots of
9907 sign extensions. This can be less efficient in certain cases on other
9910 /* If this is a signed equality comparison, we can do it as an
9911 unsigned comparison since zero-extension is cheaper than sign
9912 extension and comparisons with zero are done as unsigned. This is
9913 the case even on machines that can do fast sign extension, since
9914 zero-extension is easier to combine with other operations than
9915 sign-extension is. If we are comparing against a constant, we must
9916 convert it to what it would look like unsigned. */
9917 if ((code == EQ || code == NE) && ! unsignedp
9918 && GET_MODE_BITSIZE (GET_MODE (op0)) <= HOST_BITS_PER_WIDE_INT)
9920 if (GET_CODE (op1) == CONST_INT
9921 && (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0))) != INTVAL (op1))
9922 op1 = GEN_INT (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0)));
9927 emit_cmp_insn (op0, op1, code, size, mode, unsignedp, align);
9929 return gen_rtx_fmt_ee (code, VOIDmode, cc0_rtx, const0_rtx);
9932 /* Like do_compare_and_jump but expects the values to compare as two rtx's.
9933 The decision as to signed or unsigned comparison must be made by the caller.
9935 If MODE is BLKmode, SIZE is an RTX giving the size of the objects being
9938 If ALIGN is non-zero, it is the alignment of this type; if zero, the
9939 size of MODE should be used. */
9942 do_compare_rtx_and_jump (op0, op1, code, unsignedp, mode, size, align,
9943 if_false_label, if_true_label)
9944 register rtx op0, op1;
9947 enum machine_mode mode;
9950 rtx if_false_label, if_true_label;
9953 int dummy_true_label = 0;
9955 /* Reverse the comparison if that is safe and we want to jump if it is
9957 if (! if_true_label && ! FLOAT_MODE_P (mode))
9959 if_true_label = if_false_label;
9961 code = reverse_condition (code);
9964 /* If one operand is constant, make it the second one. Only do this
9965 if the other operand is not constant as well. */
9967 if ((CONSTANT_P (op0) && ! CONSTANT_P (op1))
9968 || (GET_CODE (op0) == CONST_INT && GET_CODE (op1) != CONST_INT))
9973 code = swap_condition (code);
9978 op0 = force_not_mem (op0);
9979 op1 = force_not_mem (op1);
9982 do_pending_stack_adjust ();
9984 if (GET_CODE (op0) == CONST_INT && GET_CODE (op1) == CONST_INT
9985 && (tem = simplify_relational_operation (code, mode, op0, op1)) != 0)
9987 if (tem == const_true_rtx)
9990 emit_jump (if_true_label);
9995 emit_jump (if_false_label);
10001 /* There's no need to do this now that combine.c can eliminate lots of
10002 sign extensions. This can be less efficient in certain cases on other
10005 /* If this is a signed equality comparison, we can do it as an
10006 unsigned comparison since zero-extension is cheaper than sign
10007 extension and comparisons with zero are done as unsigned. This is
10008 the case even on machines that can do fast sign extension, since
10009 zero-extension is easier to combine with other operations than
10010 sign-extension is. If we are comparing against a constant, we must
10011 convert it to what it would look like unsigned. */
10012 if ((code == EQ || code == NE) && ! unsignedp
10013 && GET_MODE_BITSIZE (GET_MODE (op0)) <= HOST_BITS_PER_WIDE_INT)
10015 if (GET_CODE (op1) == CONST_INT
10016 && (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0))) != INTVAL (op1))
10017 op1 = GEN_INT (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0)));
10022 if (! if_true_label)
10024 dummy_true_label = 1;
10025 if_true_label = gen_label_rtx ();
10028 emit_cmp_and_jump_insns (op0, op1, code, size, mode, unsignedp, align,
10031 if (if_false_label)
10032 emit_jump (if_false_label);
10033 if (dummy_true_label)
10034 emit_label (if_true_label);
10037 /* Generate code for a comparison expression EXP (including code to compute
10038 the values to be compared) and a conditional jump to IF_FALSE_LABEL and/or
10039 IF_TRUE_LABEL. One of the labels can be NULL_RTX, in which case the
10040 generated code will drop through.
10041 SIGNED_CODE should be the rtx operation for this comparison for
10042 signed data; UNSIGNED_CODE, likewise for use if data is unsigned.
10044 We force a stack adjustment unless there are currently
10045 things pushed on the stack that aren't yet used. */
10048 do_compare_and_jump (exp, signed_code, unsigned_code, if_false_label,
10051 enum rtx_code signed_code, unsigned_code;
10052 rtx if_false_label, if_true_label;
10054 unsigned int align0, align1;
10055 register rtx op0, op1;
10056 register tree type;
10057 register enum machine_mode mode;
10059 enum rtx_code code;
10061 /* Don't crash if the comparison was erroneous. */
10062 op0 = expand_expr_unaligned (TREE_OPERAND (exp, 0), &align0);
10063 if (TREE_CODE (TREE_OPERAND (exp, 0)) == ERROR_MARK)
10066 op1 = expand_expr_unaligned (TREE_OPERAND (exp, 1), &align1);
10067 type = TREE_TYPE (TREE_OPERAND (exp, 0));
10068 mode = TYPE_MODE (type);
10069 unsignedp = TREE_UNSIGNED (type);
10070 code = unsignedp ? unsigned_code : signed_code;
10072 #ifdef HAVE_canonicalize_funcptr_for_compare
10073 /* If function pointers need to be "canonicalized" before they can
10074 be reliably compared, then canonicalize them. */
10075 if (HAVE_canonicalize_funcptr_for_compare
10076 && TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == POINTER_TYPE
10077 && (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0))))
10080 rtx new_op0 = gen_reg_rtx (mode);
10082 emit_insn (gen_canonicalize_funcptr_for_compare (new_op0, op0));
10086 if (HAVE_canonicalize_funcptr_for_compare
10087 && TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 1))) == POINTER_TYPE
10088 && (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 1))))
10091 rtx new_op1 = gen_reg_rtx (mode);
10093 emit_insn (gen_canonicalize_funcptr_for_compare (new_op1, op1));
10098 /* Do any postincrements in the expression that was tested. */
10101 do_compare_rtx_and_jump (op0, op1, code, unsignedp, mode,
10103 ? expr_size (TREE_OPERAND (exp, 0)) : NULL_RTX),
10104 MIN (align0, align1),
10105 if_false_label, if_true_label);
10108 /* Generate code to calculate EXP using a store-flag instruction
10109 and return an rtx for the result. EXP is either a comparison
10110 or a TRUTH_NOT_EXPR whose operand is a comparison.
10112 If TARGET is nonzero, store the result there if convenient.
10114 If ONLY_CHEAP is non-zero, only do this if it is likely to be very
10117 Return zero if there is no suitable set-flag instruction
10118 available on this machine.
10120 Once expand_expr has been called on the arguments of the comparison,
10121 we are committed to doing the store flag, since it is not safe to
10122 re-evaluate the expression. We emit the store-flag insn by calling
10123 emit_store_flag, but only expand the arguments if we have a reason
10124 to believe that emit_store_flag will be successful. If we think that
10125 it will, but it isn't, we have to simulate the store-flag with a
10126 set/jump/set sequence. */
10129 do_store_flag (exp, target, mode, only_cheap)
10132 enum machine_mode mode;
10135 enum rtx_code code;
10136 tree arg0, arg1, type;
10138 enum machine_mode operand_mode;
10142 enum insn_code icode;
10143 rtx subtarget = target;
10146 /* If this is a TRUTH_NOT_EXPR, set a flag indicating we must invert the
10147 result at the end. We can't simply invert the test since it would
10148 have already been inverted if it were valid. This case occurs for
10149 some floating-point comparisons. */
10151 if (TREE_CODE (exp) == TRUTH_NOT_EXPR)
10152 invert = 1, exp = TREE_OPERAND (exp, 0);
10154 arg0 = TREE_OPERAND (exp, 0);
10155 arg1 = TREE_OPERAND (exp, 1);
10156 type = TREE_TYPE (arg0);
10157 operand_mode = TYPE_MODE (type);
10158 unsignedp = TREE_UNSIGNED (type);
10160 /* We won't bother with BLKmode store-flag operations because it would mean
10161 passing a lot of information to emit_store_flag. */
10162 if (operand_mode == BLKmode)
10165 /* We won't bother with store-flag operations involving function pointers
10166 when function pointers must be canonicalized before comparisons. */
10167 #ifdef HAVE_canonicalize_funcptr_for_compare
10168 if (HAVE_canonicalize_funcptr_for_compare
10169 && ((TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == POINTER_TYPE
10170 && (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0))))
10172 || (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 1))) == POINTER_TYPE
10173 && (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 1))))
10174 == FUNCTION_TYPE))))
10181 /* Get the rtx comparison code to use. We know that EXP is a comparison
10182 operation of some type. Some comparisons against 1 and -1 can be
10183 converted to comparisons with zero. Do so here so that the tests
10184 below will be aware that we have a comparison with zero. These
10185 tests will not catch constants in the first operand, but constants
10186 are rarely passed as the first operand. */
10188 switch (TREE_CODE (exp))
10197 if (integer_onep (arg1))
10198 arg1 = integer_zero_node, code = unsignedp ? LEU : LE;
10200 code = unsignedp ? LTU : LT;
10203 if (! unsignedp && integer_all_onesp (arg1))
10204 arg1 = integer_zero_node, code = LT;
10206 code = unsignedp ? LEU : LE;
10209 if (! unsignedp && integer_all_onesp (arg1))
10210 arg1 = integer_zero_node, code = GE;
10212 code = unsignedp ? GTU : GT;
10215 if (integer_onep (arg1))
10216 arg1 = integer_zero_node, code = unsignedp ? GTU : GT;
10218 code = unsignedp ? GEU : GE;
10221 case UNORDERED_EXPR:
10247 /* Put a constant second. */
10248 if (TREE_CODE (arg0) == REAL_CST || TREE_CODE (arg0) == INTEGER_CST)
10250 tem = arg0; arg0 = arg1; arg1 = tem;
10251 code = swap_condition (code);
10254 /* If this is an equality or inequality test of a single bit, we can
10255 do this by shifting the bit being tested to the low-order bit and
10256 masking the result with the constant 1. If the condition was EQ,
10257 we xor it with 1. This does not require an scc insn and is faster
10258 than an scc insn even if we have it. */
10260 if ((code == NE || code == EQ)
10261 && TREE_CODE (arg0) == BIT_AND_EXPR && integer_zerop (arg1)
10262 && integer_pow2p (TREE_OPERAND (arg0, 1)))
10264 tree inner = TREE_OPERAND (arg0, 0);
10265 int bitnum = tree_log2 (TREE_OPERAND (arg0, 1));
10268 /* If INNER is a right shift of a constant and it plus BITNUM does
10269 not overflow, adjust BITNUM and INNER. */
10271 if (TREE_CODE (inner) == RSHIFT_EXPR
10272 && TREE_CODE (TREE_OPERAND (inner, 1)) == INTEGER_CST
10273 && TREE_INT_CST_HIGH (TREE_OPERAND (inner, 1)) == 0
10274 && bitnum < TYPE_PRECISION (type)
10275 && 0 > compare_tree_int (TREE_OPERAND (inner, 1),
10276 bitnum - TYPE_PRECISION (type)))
10278 bitnum += TREE_INT_CST_LOW (TREE_OPERAND (inner, 1));
10279 inner = TREE_OPERAND (inner, 0);
10282 /* If we are going to be able to omit the AND below, we must do our
10283 operations as unsigned. If we must use the AND, we have a choice.
10284 Normally unsigned is faster, but for some machines signed is. */
10285 ops_unsignedp = (bitnum == TYPE_PRECISION (type) - 1 ? 1
10286 #ifdef LOAD_EXTEND_OP
10287 : (LOAD_EXTEND_OP (operand_mode) == SIGN_EXTEND ? 0 : 1)
10293 if (! get_subtarget (subtarget)
10294 || GET_MODE (subtarget) != operand_mode
10295 || ! safe_from_p (subtarget, inner, 1))
10298 op0 = expand_expr (inner, subtarget, VOIDmode, 0);
10301 op0 = expand_shift (RSHIFT_EXPR, GET_MODE (op0), op0,
10302 size_int (bitnum), subtarget, ops_unsignedp);
10304 if (GET_MODE (op0) != mode)
10305 op0 = convert_to_mode (mode, op0, ops_unsignedp);
10307 if ((code == EQ && ! invert) || (code == NE && invert))
10308 op0 = expand_binop (mode, xor_optab, op0, const1_rtx, subtarget,
10309 ops_unsignedp, OPTAB_LIB_WIDEN);
10311 /* Put the AND last so it can combine with more things. */
10312 if (bitnum != TYPE_PRECISION (type) - 1)
10313 op0 = expand_and (op0, const1_rtx, subtarget);
10318 /* Now see if we are likely to be able to do this. Return if not. */
10319 if (! can_compare_p (code, operand_mode, ccp_store_flag))
10322 icode = setcc_gen_code[(int) code];
10323 if (icode == CODE_FOR_nothing
10324 || (only_cheap && insn_data[(int) icode].operand[0].mode != mode))
10326 /* We can only do this if it is one of the special cases that
10327 can be handled without an scc insn. */
10328 if ((code == LT && integer_zerop (arg1))
10329 || (! only_cheap && code == GE && integer_zerop (arg1)))
10331 else if (BRANCH_COST >= 0
10332 && ! only_cheap && (code == NE || code == EQ)
10333 && TREE_CODE (type) != REAL_TYPE
10334 && ((abs_optab->handlers[(int) operand_mode].insn_code
10335 != CODE_FOR_nothing)
10336 || (ffs_optab->handlers[(int) operand_mode].insn_code
10337 != CODE_FOR_nothing)))
10343 preexpand_calls (exp);
10344 if (! get_subtarget (target)
10345 || GET_MODE (subtarget) != operand_mode
10346 || ! safe_from_p (subtarget, arg1, 1))
10349 op0 = expand_expr (arg0, subtarget, VOIDmode, 0);
10350 op1 = expand_expr (arg1, NULL_RTX, VOIDmode, 0);
10353 target = gen_reg_rtx (mode);
10355 /* Pass copies of OP0 and OP1 in case they contain a QUEUED. This is safe
10356 because, if the emit_store_flag does anything it will succeed and
10357 OP0 and OP1 will not be used subsequently. */
10359 result = emit_store_flag (target, code,
10360 queued_subexp_p (op0) ? copy_rtx (op0) : op0,
10361 queued_subexp_p (op1) ? copy_rtx (op1) : op1,
10362 operand_mode, unsignedp, 1);
10367 result = expand_binop (mode, xor_optab, result, const1_rtx,
10368 result, 0, OPTAB_LIB_WIDEN);
10372 /* If this failed, we have to do this with set/compare/jump/set code. */
10373 if (GET_CODE (target) != REG
10374 || reg_mentioned_p (target, op0) || reg_mentioned_p (target, op1))
10375 target = gen_reg_rtx (GET_MODE (target));
10377 emit_move_insn (target, invert ? const0_rtx : const1_rtx);
10378 result = compare_from_rtx (op0, op1, code, unsignedp,
10379 operand_mode, NULL_RTX, 0);
10380 if (GET_CODE (result) == CONST_INT)
10381 return (((result == const0_rtx && ! invert)
10382 || (result != const0_rtx && invert))
10383 ? const0_rtx : const1_rtx);
10385 label = gen_label_rtx ();
10386 if (bcc_gen_fctn[(int) code] == 0)
10389 emit_jump_insn ((*bcc_gen_fctn[(int) code]) (label));
10390 emit_move_insn (target, invert ? const1_rtx : const0_rtx);
10391 emit_label (label);
10396 /* Generate a tablejump instruction (used for switch statements). */
10398 #ifdef HAVE_tablejump
10400 /* INDEX is the value being switched on, with the lowest value
10401 in the table already subtracted.
10402 MODE is its expected mode (needed if INDEX is constant).
10403 RANGE is the length of the jump table.
10404 TABLE_LABEL is a CODE_LABEL rtx for the table itself.
10406 DEFAULT_LABEL is a CODE_LABEL rtx to jump to if the
10407 index value is out of range. */
10410 do_tablejump (index, mode, range, table_label, default_label)
10411 rtx index, range, table_label, default_label;
10412 enum machine_mode mode;
10414 register rtx temp, vector;
10416 /* Do an unsigned comparison (in the proper mode) between the index
10417 expression and the value which represents the length of the range.
10418 Since we just finished subtracting the lower bound of the range
10419 from the index expression, this comparison allows us to simultaneously
10420 check that the original index expression value is both greater than
10421 or equal to the minimum value of the range and less than or equal to
10422 the maximum value of the range. */
10424 emit_cmp_and_jump_insns (index, range, GTU, NULL_RTX, mode, 1,
10427 /* If index is in range, it must fit in Pmode.
10428 Convert to Pmode so we can index with it. */
10430 index = convert_to_mode (Pmode, index, 1);
10432 /* Don't let a MEM slip thru, because then INDEX that comes
10433 out of PIC_CASE_VECTOR_ADDRESS won't be a valid address,
10434 and break_out_memory_refs will go to work on it and mess it up. */
10435 #ifdef PIC_CASE_VECTOR_ADDRESS
10436 if (flag_pic && GET_CODE (index) != REG)
10437 index = copy_to_mode_reg (Pmode, index);
10440 /* If flag_force_addr were to affect this address
10441 it could interfere with the tricky assumptions made
10442 about addresses that contain label-refs,
10443 which may be valid only very near the tablejump itself. */
10444 /* ??? The only correct use of CASE_VECTOR_MODE is the one inside the
10445 GET_MODE_SIZE, because this indicates how large insns are. The other
10446 uses should all be Pmode, because they are addresses. This code
10447 could fail if addresses and insns are not the same size. */
10448 index = gen_rtx_PLUS (Pmode,
10449 gen_rtx_MULT (Pmode, index,
10450 GEN_INT (GET_MODE_SIZE (CASE_VECTOR_MODE))),
10451 gen_rtx_LABEL_REF (Pmode, table_label));
10452 #ifdef PIC_CASE_VECTOR_ADDRESS
10454 index = PIC_CASE_VECTOR_ADDRESS (index);
10457 index = memory_address_noforce (CASE_VECTOR_MODE, index);
10458 temp = gen_reg_rtx (CASE_VECTOR_MODE);
10459 vector = gen_rtx_MEM (CASE_VECTOR_MODE, index);
10460 RTX_UNCHANGING_P (vector) = 1;
10461 convert_move (temp, vector, 0);
10463 emit_jump_insn (gen_tablejump (temp, table_label));
10465 /* If we are generating PIC code or if the table is PC-relative, the
10466 table and JUMP_INSN must be adjacent, so don't output a BARRIER. */
10467 if (! CASE_VECTOR_PC_RELATIVE && ! flag_pic)
10471 #endif /* HAVE_tablejump */