1 /* Definitions for code generation pass of GNU compiler.
2 Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
25 /* For inhibit_defer_pop */
27 /* For XEXP, GEN_INT, rtx_code */
29 /* For optimize_size */
31 /* For host_integerp, tree_low_cst, fold_convert, size_binop, ssize_int,
32 TREE_CODE, TYPE_SIZE, int_size_in_bytes, */
34 /* For GET_MODE_BITSIZE, word_mode */
37 /* The default branch cost is 1. */
39 #define BRANCH_COST(speed_p, predictable_p) 1
42 /* This is the 4th arg to `expand_expr'.
43 EXPAND_STACK_PARM means we are possibly expanding a call param onto
45 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
46 EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
47 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
48 is a constant that is not a legitimate address.
49 EXPAND_WRITE means we are only going to write to the resulting rtx.
50 EXPAND_MEMORY means we are interested in a memory result, even if
51 the memory is constant and we could have propagated a constant value. */
52 enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM,
53 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE,
56 /* Prevent the compiler from deferring stack pops. See
57 inhibit_defer_pop for more information. */
58 #define NO_DEFER_POP (inhibit_defer_pop += 1)
60 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for
62 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
64 /* If a memory-to-memory move would take MOVE_RATIO or more simple
65 move-instruction sequences, we will do a movmem or libcall instead. */
68 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
69 #define MOVE_RATIO(speed) 2
71 /* If we are optimizing for space (-Os), cut down the default move ratio. */
72 #define MOVE_RATIO(speed) ((speed) ? 15 : 3)
76 /* If a clear memory operation would take CLEAR_RATIO or more simple
77 move-instruction sequences, we will do a setmem or libcall instead. */
80 #if defined (HAVE_setmemqi) || defined (HAVE_setmemhi) || defined (HAVE_setmemsi) || defined (HAVE_setmemdi) || defined (HAVE_setmemti)
81 #define CLEAR_RATIO(speed) 2
83 /* If we are optimizing for space, cut down the default clear ratio. */
84 #define CLEAR_RATIO(speed) ((speed) ? 15 :3)
88 /* If a memory set (to value other than zero) operation would take
89 SET_RATIO or more simple move-instruction sequences, we will do a movmem
90 or libcall instead. */
92 #define SET_RATIO(speed) MOVE_RATIO(speed)
95 enum direction {none, upward, downward};
97 /* Structure to record the size of a sequence of arguments
98 as the sum of a tree-expression and a constant. This structure is
99 also used to store offsets from the stack, which might be negative,
100 so the variable part must be ssizetype, not sizetype. */
104 HOST_WIDE_INT constant;
108 /* Package up various arg related fields of struct args for
109 locate_and_pad_parm. */
110 struct locate_and_pad_arg_data
112 /* Size of this argument on the stack, rounded up for any padding it
113 gets. If REG_PARM_STACK_SPACE is defined, then register parms are
114 counted here, otherwise they aren't. */
115 struct args_size size;
116 /* Offset of this argument from beginning of stack-args. */
117 struct args_size offset;
118 /* Offset to the start of the stack slot. Different from OFFSET
119 if this arg pads downward. */
120 struct args_size slot_offset;
121 /* The amount that the stack pointer needs to be adjusted to
122 force alignment for the next argument. */
123 struct args_size alignment_pad;
124 /* Which way we should pad this arg. */
125 enum direction where_pad;
126 /* slot_offset is at least this aligned. */
127 unsigned int boundary;
130 /* Add the value of the tree INC to the `struct args_size' TO. */
132 #define ADD_PARM_SIZE(TO, INC) \
135 if (host_integerp (inc, 0)) \
136 (TO).constant += tree_low_cst (inc, 0); \
137 else if ((TO).var == 0) \
138 (TO).var = fold_convert (ssizetype, inc); \
140 (TO).var = size_binop (PLUS_EXPR, (TO).var, \
141 fold_convert (ssizetype, inc)); \
144 #define SUB_PARM_SIZE(TO, DEC) \
147 if (host_integerp (dec, 0)) \
148 (TO).constant -= tree_low_cst (dec, 0); \
149 else if ((TO).var == 0) \
150 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \
151 fold_convert (ssizetype, dec)); \
153 (TO).var = size_binop (MINUS_EXPR, (TO).var, \
154 fold_convert (ssizetype, dec)); \
157 /* Convert the implicit sum in a `struct args_size' into a tree
158 of type ssizetype. */
159 #define ARGS_SIZE_TREE(SIZE) \
160 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \
161 : size_binop (PLUS_EXPR, fold_convert (ssizetype, (SIZE).var), \
162 ssize_int ((SIZE).constant)))
164 /* Convert the implicit sum in a `struct args_size' into an rtx. */
165 #define ARGS_SIZE_RTX(SIZE) \
166 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
167 : expand_normal (ARGS_SIZE_TREE (SIZE)))
169 /* Supply a default definition for FUNCTION_ARG_PADDING:
170 usually pad upward, but pad short args downward on
171 big-endian machines. */
173 #define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE) \
174 (! BYTES_BIG_ENDIAN \
176 : (((MODE) == BLKmode \
177 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
178 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
179 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
180 ? downward : upward))
182 #ifndef FUNCTION_ARG_PADDING
183 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
184 DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE))
187 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
188 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
191 #ifndef FUNCTION_ARG_BOUNDARY
192 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
195 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
196 Normally move_insn, so Pmode stack pointer. */
198 #ifndef STACK_SAVEAREA_MODE
199 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
202 /* Supply a default definition of STACK_SIZE_MODE for
203 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
205 #ifndef STACK_SIZE_MODE
206 #define STACK_SIZE_MODE word_mode
209 /* Provide default values for the macros controlling stack checking. */
211 /* The default is neither full builtin stack checking... */
212 #ifndef STACK_CHECK_BUILTIN
213 #define STACK_CHECK_BUILTIN 0
216 /* ...nor static builtin stack checking. */
217 #ifndef STACK_CHECK_STATIC_BUILTIN
218 #define STACK_CHECK_STATIC_BUILTIN 0
221 /* The default interval is one page. */
222 #ifndef STACK_CHECK_PROBE_INTERVAL
223 #define STACK_CHECK_PROBE_INTERVAL 4096
226 /* The default is to do a store into the stack. */
227 #ifndef STACK_CHECK_PROBE_LOAD
228 #define STACK_CHECK_PROBE_LOAD 0
231 /* This is a kludge to try to capture the discrepancy between the old
232 mechanism (generic stack checking) and the new mechanism (static
233 builtin stack checking). STACK_CHECK_PROTECT needs to be bumped
234 for the latter because part of the protection area is effectively
235 included in STACK_CHECK_MAX_FRAME_SIZE for the former. */
236 #ifdef STACK_CHECK_PROTECT
237 #define STACK_OLD_CHECK_PROTECT STACK_CHECK_PROTECT
239 #define STACK_OLD_CHECK_PROTECT \
240 (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 8 * 1024)
243 /* Minimum amount of stack required to recover from an anticipated stack
244 overflow detection. The default value conveys an estimate of the amount
245 of stack required to propagate an exception. */
246 #ifndef STACK_CHECK_PROTECT
247 #define STACK_CHECK_PROTECT \
248 (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 12 * 1024)
251 /* Make the maximum frame size be the largest we can and still only need
252 one probe per function. */
253 #ifndef STACK_CHECK_MAX_FRAME_SIZE
254 #define STACK_CHECK_MAX_FRAME_SIZE \
255 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
258 /* This is arbitrary, but should be large enough everywhere. */
259 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
260 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
263 /* Provide a reasonable default for the maximum size of an object to
264 allocate in the fixed frame. We may need to be able to make this
265 controllable by the user at some point. */
266 #ifndef STACK_CHECK_MAX_VAR_SIZE
267 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
270 /* This structure is used to pass around information about exploded
271 unary, binary and trinary expressions between expand_expr_real_1 and
273 typedef struct separate_ops
281 /* Functions from optabs.c, commonly used, and without need for the optabs
284 /* Passed to expand_simple_binop and expand_binop to say which options
285 to try to use if the requested operation can't be open-coded on the
286 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
287 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
288 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
289 try anything else. */
300 /* Generate code for a simple binary or unary operation. "Simple" in
301 this case means "can be unambiguously described by a (mode, code)
302 pair and mapped to a single optab." */
303 extern rtx expand_simple_binop (enum machine_mode, enum rtx_code, rtx,
304 rtx, rtx, int, enum optab_methods);
305 extern rtx expand_simple_unop (enum machine_mode, enum rtx_code, rtx, rtx,
308 /* Report whether the machine description contains an insn which can
309 perform the operation described by CODE and MODE. */
310 extern int have_insn_for (enum rtx_code, enum machine_mode);
312 extern rtx prepare_operand (int, rtx, int, enum machine_mode, enum machine_mode,
315 /* Emit code to make a call to a constant function or a library call. */
316 extern void emit_libcall_block (rtx, rtx, rtx, rtx);
318 /* Create but don't emit one rtl instruction to perform certain operations.
319 Modes must match; operands must meet the operation's predicates.
320 Likewise for subtraction and for just copying. */
321 extern rtx gen_add2_insn (rtx, rtx);
322 extern rtx gen_add3_insn (rtx, rtx, rtx);
323 extern rtx gen_sub2_insn (rtx, rtx);
324 extern rtx gen_sub3_insn (rtx, rtx, rtx);
325 extern rtx gen_move_insn (rtx, rtx);
326 extern int have_add2_insn (rtx, rtx);
327 extern int have_sub2_insn (rtx, rtx);
329 /* Emit a pair of rtl insns to compare two rtx's and to jump
330 to a label if the comparison is true. */
331 extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx,
332 enum machine_mode, int, rtx);
334 /* Generate code to indirectly jump to a location given in the rtx LOC. */
335 extern void emit_indirect_jump (rtx);
337 /* Generate a conditional trap instruction. */
338 extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
340 #include "insn-config.h"
342 #ifdef HAVE_conditional_move
343 /* Emit a conditional move operation. */
344 rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
345 rtx, rtx, enum machine_mode, int);
347 /* Return nonzero if the conditional move is supported. */
348 int can_conditionally_move_p (enum machine_mode mode);
351 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
352 rtx, rtx, enum machine_mode, int);
354 rtx expand_val_compare_and_swap (rtx, rtx, rtx, rtx);
355 rtx expand_bool_compare_and_swap (rtx, rtx, rtx, rtx);
356 rtx expand_sync_operation (rtx, rtx, enum rtx_code);
357 rtx expand_sync_fetch_operation (rtx, rtx, enum rtx_code, bool, rtx);
358 rtx expand_sync_lock_test_and_set (rtx, rtx, rtx);
360 /* Functions from expmed.c: */
362 /* Arguments MODE, RTX: return an rtx for the negation of that value.
364 extern rtx negate_rtx (enum machine_mode, rtx);
366 /* Expand a logical AND operation. */
367 extern rtx expand_and (enum machine_mode, rtx, rtx, rtx);
369 /* Emit a store-flag operation. */
370 extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
373 /* Like emit_store_flag, but always succeeds. */
374 extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx,
375 enum machine_mode, int, int);
377 /* Functions from builtins.c: */
378 extern rtx expand_builtin (tree, rtx, rtx, enum machine_mode, int);
379 extern tree std_build_builtin_va_list (void);
380 extern tree std_fn_abi_va_list (tree);
381 extern tree std_canonical_va_list_type (tree);
383 extern void std_expand_builtin_va_start (tree, rtx);
384 extern rtx default_expand_builtin (tree, rtx, rtx, enum machine_mode, int);
385 extern void expand_builtin_setjmp_setup (rtx, rtx);
386 extern void expand_builtin_setjmp_receiver (rtx);
387 extern rtx expand_builtin_saveregs (void);
388 extern void expand_builtin_trap (void);
389 extern rtx builtin_strncpy_read_str (void *, HOST_WIDE_INT, enum machine_mode);
391 /* Functions from expr.c: */
393 /* This is run during target initialization to set up which modes can be
394 used directly in memory and to initialize the block move optab. */
395 extern void init_expr_target (void);
397 /* This is run at the start of compiling a function. */
398 extern void init_expr (void);
400 /* Emit some rtl insns to move data between rtx's, converting machine modes.
401 Both modes must be floating or both fixed. */
402 extern void convert_move (rtx, rtx, int);
404 /* Convert an rtx to specified machine mode and return the result. */
405 extern rtx convert_to_mode (enum machine_mode, rtx, int);
407 /* Convert an rtx to MODE from OLDMODE and return the result. */
408 extern rtx convert_modes (enum machine_mode, enum machine_mode, rtx, int);
410 /* Emit code to move a block Y to a block X. */
412 enum block_op_methods
417 /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */
421 extern GTY(()) tree block_clear_fn;
422 extern void init_block_move_fn (const char *);
423 extern void init_block_clear_fn (const char *);
425 extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods);
426 extern rtx emit_block_move_via_libcall (rtx, rtx, rtx, bool);
427 extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods,
428 unsigned int, HOST_WIDE_INT);
430 /* Copy all or part of a value X into registers starting at REGNO.
431 The number of registers to be filled is NREGS. */
432 extern void move_block_to_reg (int, rtx, int, enum machine_mode);
434 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
435 The number of registers to be filled is NREGS. */
436 extern void move_block_from_reg (int, rtx, int);
438 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
439 extern rtx gen_group_rtx (rtx);
441 /* Load a BLKmode value into non-consecutive registers represented by a
443 extern void emit_group_load (rtx, rtx, tree, int);
445 /* Similarly, but load into new temporaries. */
446 extern rtx emit_group_load_into_temps (rtx, rtx, tree, int);
448 /* Move a non-consecutive group of registers represented by a PARALLEL into
449 a non-consecutive group of registers represented by a PARALLEL. */
450 extern void emit_group_move (rtx, rtx);
452 /* Move a group of registers represented by a PARALLEL into pseudos. */
453 extern rtx emit_group_move_into_temps (rtx);
455 /* Store a BLKmode value from non-consecutive registers represented by a
457 extern void emit_group_store (rtx, rtx, tree, int);
459 /* Copy BLKmode object from a set of registers. */
460 extern rtx copy_blkmode_from_reg (rtx, rtx, tree);
462 /* Mark REG as holding a parameter for the next CALL_INSN. */
463 extern void use_reg (rtx *, rtx);
465 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
466 for the next CALL_INSN. */
467 extern void use_regs (rtx *, int, int);
469 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
470 extern void use_group_regs (rtx *, rtx);
472 /* Write zeros through the storage of OBJECT.
473 If OBJECT has BLKmode, SIZE is its length in bytes. */
474 extern rtx clear_storage (rtx, rtx, enum block_op_methods);
475 extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods,
476 unsigned int, HOST_WIDE_INT);
477 /* The same, but always output an library call. */
478 rtx set_storage_via_libcall (rtx, rtx, rtx, bool);
480 /* Expand a setmem pattern; return true if successful. */
481 extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int,
482 unsigned int, HOST_WIDE_INT);
484 /* Determine whether the LEN bytes can be moved by using several move
485 instructions. Return nonzero if a call to move_by_pieces should
487 extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
489 /* Return nonzero if it is desirable to store LEN bytes generated by
490 CONSTFUN with several move instructions by store_by_pieces
491 function. CONSTFUNDATA is a pointer which will be passed as argument
492 in every CONSTFUN call.
493 ALIGN is maximum alignment we can assume.
494 MEMSETP is true if this is a real memset/bzero, not a copy
495 of a const string. */
496 extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
497 rtx (*) (void *, HOST_WIDE_INT,
499 void *, unsigned int, bool);
501 /* Generate several move instructions to store LEN bytes generated by
502 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
503 pointer which will be passed as argument in every CONSTFUN call.
504 ALIGN is maximum alignment we can assume.
505 MEMSETP is true if this is a real memset/bzero, not a copy.
507 extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT,
508 rtx (*) (void *, HOST_WIDE_INT, enum machine_mode),
509 void *, unsigned int, bool, int);
511 /* Emit insns to set X from Y. */
512 extern rtx emit_move_insn (rtx, rtx);
514 /* Emit insns to set X from Y, with no frills. */
515 extern rtx emit_move_insn_1 (rtx, rtx);
517 extern rtx emit_move_complex_push (enum machine_mode, rtx, rtx);
518 extern rtx emit_move_complex_parts (rtx, rtx);
520 /* Push a block of length SIZE (perhaps variable)
521 and return an rtx to address the beginning of the block. */
522 extern rtx push_block (rtx, int, int);
524 /* Generate code to push something onto the stack, given its mode and type. */
525 extern void emit_push_insn (rtx, enum machine_mode, tree, rtx, unsigned int,
526 int, rtx, int, rtx, rtx, int, rtx);
528 /* Expand an assignment that stores the value of FROM into TO. */
529 extern void expand_assignment (tree, tree, bool);
531 /* Generate code for computing expression EXP,
532 and storing the value into TARGET.
533 If SUGGEST_REG is nonzero, copy the value through a register
534 and return that register, if that is possible. */
535 extern rtx store_expr (tree, rtx, int, bool);
537 /* Given an rtx that may include add and multiply operations,
538 generate them as insns and return a pseudo-reg containing the value.
539 Useful after calling expand_expr with 1 as sum_ok. */
540 extern rtx force_operand (rtx, rtx);
542 /* Work horse for expand_expr. */
543 extern rtx expand_expr_real (tree, rtx, enum machine_mode,
544 enum expand_modifier, rtx *);
546 /* Generate code for computing expression EXP.
547 An rtx for the computed value is returned. The value is never null.
548 In the case of a void EXP, const0_rtx is returned. */
550 expand_expr (tree exp, rtx target, enum machine_mode mode,
551 enum expand_modifier modifier)
553 return expand_expr_real (exp, target, mode, modifier, NULL);
557 expand_normal (tree exp)
559 return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL);
562 /* At the start of a function, record that we have no previously-pushed
563 arguments waiting to be popped. */
564 extern void init_pending_stack_adjust (void);
566 /* Discard any pending stack adjustment. */
567 extern void discard_pending_stack_adjust (void);
569 /* When exiting from function, if safe, clear out any pending stack adjust
570 so the adjustment won't get done. */
571 extern void clear_pending_stack_adjust (void);
573 /* Pop any previously-pushed arguments that have not been popped yet. */
574 extern void do_pending_stack_adjust (void);
576 /* Return the tree node and offset if a given argument corresponds to
577 a string constant. */
578 extern tree string_constant (tree, tree *);
580 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
581 extern void jumpifnot (tree, rtx);
583 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
584 extern void jumpif (tree, rtx);
586 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
587 the result is zero, or IF_TRUE_LABEL if the result is one. */
588 extern void do_jump (tree, rtx, rtx);
590 extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int,
591 enum machine_mode, rtx, rtx, rtx);
593 /* Two different ways of generating switch statements. */
594 extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx);
595 extern int try_tablejump (tree, tree, tree, tree, rtx, rtx);
597 /* Functions from alias.c */
601 /* rtl.h and tree.h were included. */
602 /* Return an rtx for the size in bytes of the value of an expr. */
603 extern rtx expr_size (tree);
605 /* Return a wide integer for the size in bytes of the value of EXP, or -1
606 if the size can vary or is larger than an integer. */
607 extern HOST_WIDE_INT int_expr_size (tree);
609 /* Return an rtx that refers to the value returned by a function
610 in its original home. This becomes invalid if any more code is emitted. */
611 extern rtx hard_function_value (const_tree, const_tree, const_tree, int);
613 extern rtx prepare_call_address (rtx, rtx, rtx *, int, int);
615 extern bool shift_return_value (enum machine_mode, bool, rtx);
617 extern rtx expand_call (tree, rtx, int);
619 extern void fixup_tail_calls (void);
622 extern rtx expand_shift (enum tree_code, enum machine_mode, rtx, tree, rtx,
624 extern rtx expand_divmod (int, enum tree_code, enum machine_mode, rtx, rtx,
628 extern void locate_and_pad_parm (enum machine_mode, tree, int, int, tree,
630 struct locate_and_pad_arg_data *);
632 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
633 extern rtx label_rtx (tree);
635 /* As label_rtx, but additionally the label is placed on the forced label
636 list of its containing function (i.e. it is treated as reachable even
637 if how is not obvious). */
638 extern rtx force_label_rtx (tree);
640 /* Return an rtx like arg but sans any constant terms.
641 Returns the original rtx if it has no constant terms.
642 The constant terms are added and stored via a second arg. */
643 extern rtx eliminate_constant_term (rtx, rtx *);
645 /* Convert arg to a valid memory address for specified machine mode,
646 by emitting insns to perform arithmetic if nec. */
647 extern rtx memory_address (enum machine_mode, rtx);
649 /* Return a memory reference like MEMREF, but with its mode changed
650 to MODE and its address changed to ADDR.
651 (VOIDmode means don't change the mode.
652 NULL for ADDR means don't change the address.) */
653 extern rtx change_address (rtx, enum machine_mode, rtx);
655 /* Return a memory reference like MEMREF, but with its mode changed
656 to MODE and its address offset by OFFSET bytes. */
657 #define adjust_address(MEMREF, MODE, OFFSET) \
658 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
660 /* Likewise, but the reference is not required to be valid. */
661 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
662 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
664 /* Return a memory reference like MEMREF, but with its mode changed
665 to MODE and its address changed to ADDR, which is assumed to be
666 increased by OFFSET bytes from MEMREF. */
667 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
668 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
670 /* Likewise, but the reference is not required to be valid. */
671 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
672 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
674 extern rtx adjust_address_1 (rtx, enum machine_mode, HOST_WIDE_INT, int, int);
675 extern rtx adjust_automodify_address_1 (rtx, enum machine_mode, rtx,
678 /* Return a memory reference like MEMREF, but whose address is changed by
679 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
680 known to be in OFFSET (possibly 1). */
681 extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT);
683 /* Definitions from emit-rtl.c */
684 #include "emit-rtl.h"
686 /* Return a memory reference like MEMREF, but with its mode widened to
687 MODE and adjusted by OFFSET. */
688 extern rtx widen_memory_access (rtx, enum machine_mode, HOST_WIDE_INT);
690 /* Return a memory reference like MEMREF, but which is known to have a
692 extern rtx validize_mem (rtx);
694 extern rtx use_anchored_address (rtx);
696 /* Given REF, a MEM, and T, either the type of X or the expression
697 corresponding to REF, set the memory attributes. OBJECTP is nonzero
698 if we are making a new object of this type. */
699 extern void set_mem_attributes (rtx, tree, int);
701 /* Similar, except that BITPOS has not yet been applied to REF, so if
702 we alter MEM_OFFSET according to T then we should subtract BITPOS
703 expecting that it'll be added back in later. */
704 extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT);
706 /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN
707 bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or
709 extern int get_mem_align_offset (rtx, unsigned int);
711 /* Assemble the static constant template for function entry trampolines. */
712 extern rtx assemble_trampoline_template (void);
714 /* Copy given rtx to a new temp reg and return that. */
715 extern rtx copy_to_reg (rtx);
717 /* Like copy_to_reg but always make the reg Pmode. */
718 extern rtx copy_addr_to_reg (rtx);
720 /* Like copy_to_reg but always make the reg the specified mode MODE. */
721 extern rtx copy_to_mode_reg (enum machine_mode, rtx);
723 /* Copy given rtx to given temp reg and return that. */
724 extern rtx copy_to_suggested_reg (rtx, rtx, enum machine_mode);
726 /* Copy a value to a register if it isn't already a register.
727 Args are mode (in case value is a constant) and the value. */
728 extern rtx force_reg (enum machine_mode, rtx);
730 /* Return given rtx, copied into a new temp reg if it was in memory. */
731 extern rtx force_not_mem (rtx);
733 /* Return mode and signedness to use when an argument or result in the
734 given mode is promoted. */
735 extern enum machine_mode promote_function_mode (const_tree, enum machine_mode, int *,
738 /* Return mode and signedness to use when an object in the given mode
740 extern enum machine_mode promote_mode (const_tree, enum machine_mode, int *);
742 /* Return mode and signedness to use when object is promoted. */
743 enum machine_mode promote_decl_mode (const_tree, int *);
745 /* Remove some bytes from the stack. An rtx says how many. */
746 extern void adjust_stack (rtx);
748 /* Add some bytes to the stack. An rtx says how many. */
749 extern void anti_adjust_stack (rtx);
751 /* This enum is used for the following two functions. */
752 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
754 /* Save the stack pointer at the specified level. */
755 extern void emit_stack_save (enum save_level, rtx *, rtx);
757 /* Restore the stack pointer from a save area of the specified level. */
758 extern void emit_stack_restore (enum save_level, rtx, rtx);
760 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */
761 extern void update_nonlocal_goto_save_area (void);
763 /* Allocate some space on the stack dynamically and return its address. An rtx
764 says how many bytes. */
765 extern rtx allocate_dynamic_stack_space (rtx, rtx, int);
767 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
768 FIRST is a constant and size is a Pmode RTX. These are offsets from the
769 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
770 subtract from the stack. If SIZE is constant, this is done
771 with a fixed number of probes. Otherwise, we must make a loop. */
772 extern void probe_stack_range (HOST_WIDE_INT, rtx);
774 /* Return an rtx that refers to the value returned by a library call
775 in its original home. This becomes invalid if any more code is emitted. */
776 extern rtx hard_libcall_value (enum machine_mode, rtx);
778 /* Return the mode desired by operand N of a particular bitfield
779 insert/extract insn, or MAX_MACHINE_MODE if no such insn is
782 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
783 extern enum machine_mode
784 mode_for_extraction (enum extraction_pattern, int);
786 extern void store_bit_field (rtx, unsigned HOST_WIDE_INT,
787 unsigned HOST_WIDE_INT, enum machine_mode, rtx);
788 extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT,
789 unsigned HOST_WIDE_INT, int, rtx,
790 enum machine_mode, enum machine_mode);
791 extern rtx extract_low_bits (enum machine_mode, enum machine_mode, rtx);
792 extern rtx expand_mult (enum machine_mode, rtx, rtx, rtx, int);
793 extern rtx expand_mult_highpart_adjust (enum machine_mode, rtx, rtx, rtx, rtx, int);
795 extern rtx assemble_static_space (unsigned HOST_WIDE_INT);
796 extern int safe_from_p (const_rtx, tree, int);
797 extern bool split_comparison (enum rtx_code, enum machine_mode,
798 enum rtx_code *, enum rtx_code *);
800 /* Call this once to initialize the contents of the optabs
801 appropriately for the current target machine. */
802 extern void init_optabs (void);
803 extern void init_all_optabs (void);
805 /* Call this to initialize an optab function entry. */
806 extern rtx init_one_libfunc (const char *);
807 extern rtx set_user_assembler_libfunc (const char *, const char *);
809 extern int vector_mode_valid_p (enum machine_mode);
811 #endif /* GCC_EXPR_H */