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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
25 /* For inhibit_defer_pop */
27 /* For XEXP, GEN_INT, rtx_code */
29 /* For optimize_size */
31 /* For host_integerp, tree_low_cst, convert, size_binop, ssize_int, TREE_CODE,
32 TYPE_SIZE, int_size_in_bytes, */
34 /* For GET_MODE_BITSIZE, word_mode */
37 /* The default branch cost is 1. */
42 /* This is the 4th arg to `expand_expr'.
43 EXPAND_STACK_PARM means we are possibly expanding a call param onto
44 the stack. Choosing a value of 2 isn't special; It just allows
45 some code optimization in store_expr.
46 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
47 EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
48 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
49 is a constant that is not a legitimate address.
50 EXPAND_WRITE means we are only going to write to the resulting rtx.
51 EXPAND_MEMORY means we are interested in a memory result, even if
52 the memory is constant and we could have propagated a constant value. */
53 enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM = 2, EXPAND_SUM,
54 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE,
57 /* Prevent the compiler from deferring stack pops. See
58 inhibit_defer_pop for more information. */
59 #define NO_DEFER_POP (inhibit_defer_pop += 1)
61 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for
63 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
65 /* If a memory-to-memory move would take MOVE_RATIO or more simple
66 move-instruction sequences, we will do a movmem or libcall instead. */
69 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
72 /* If we are optimizing for space (-Os), cut down the default move ratio. */
73 #define MOVE_RATIO (optimize_size ? 3 : 15)
77 /* If a clear memory operation would take CLEAR_RATIO or more simple
78 move-instruction sequences, we will do a clrmem or libcall instead. */
81 #if defined (HAVE_clrmemqi) || defined (HAVE_clrmemhi) || defined (HAVE_clrmemsi) || defined (HAVE_clrmemdi) || defined (HAVE_clrmemti)
84 /* If we are optimizing for space, cut down the default clear ratio. */
85 #define CLEAR_RATIO (optimize_size ? 3 : 15)
89 enum direction {none, upward, downward};
91 /* Structure to record the size of a sequence of arguments
92 as the sum of a tree-expression and a constant. This structure is
93 also used to store offsets from the stack, which might be negative,
94 so the variable part must be ssizetype, not sizetype. */
98 HOST_WIDE_INT constant;
102 /* Package up various arg related fields of struct args for
103 locate_and_pad_parm. */
104 struct locate_and_pad_arg_data
106 /* Size of this argument on the stack, rounded up for any padding it
107 gets. If REG_PARM_STACK_SPACE is defined, then register parms are
108 counted here, otherwise they aren't. */
109 struct args_size size;
110 /* Offset of this argument from beginning of stack-args. */
111 struct args_size offset;
112 /* Offset to the start of the stack slot. Different from OFFSET
113 if this arg pads downward. */
114 struct args_size slot_offset;
115 /* The amount that the stack pointer needs to be adjusted to
116 force alignment for the next argument. */
117 struct args_size alignment_pad;
118 /* Which way we should pad this arg. */
119 enum direction where_pad;
122 /* Add the value of the tree INC to the `struct args_size' TO. */
124 #define ADD_PARM_SIZE(TO, INC) \
127 if (host_integerp (inc, 0)) \
128 (TO).constant += tree_low_cst (inc, 0); \
129 else if ((TO).var == 0) \
130 (TO).var = convert (ssizetype, inc); \
132 (TO).var = size_binop (PLUS_EXPR, (TO).var, \
133 convert (ssizetype, inc)); \
136 #define SUB_PARM_SIZE(TO, DEC) \
139 if (host_integerp (dec, 0)) \
140 (TO).constant -= tree_low_cst (dec, 0); \
141 else if ((TO).var == 0) \
142 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \
143 convert (ssizetype, dec)); \
145 (TO).var = size_binop (MINUS_EXPR, (TO).var, \
146 convert (ssizetype, dec)); \
149 /* Convert the implicit sum in a `struct args_size' into a tree
150 of type ssizetype. */
151 #define ARGS_SIZE_TREE(SIZE) \
152 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \
153 : size_binop (PLUS_EXPR, convert (ssizetype, (SIZE).var), \
154 ssize_int ((SIZE).constant)))
156 /* Convert the implicit sum in a `struct args_size' into an rtx. */
157 #define ARGS_SIZE_RTX(SIZE) \
158 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
159 : expand_expr (ARGS_SIZE_TREE (SIZE), NULL_RTX, VOIDmode, 0))
161 /* Supply a default definition for FUNCTION_ARG_PADDING:
162 usually pad upward, but pad short args downward on
163 big-endian machines. */
165 #define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE) \
166 (! BYTES_BIG_ENDIAN \
168 : (((MODE) == BLKmode \
169 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
170 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
171 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
172 ? downward : upward))
174 #ifndef FUNCTION_ARG_PADDING
175 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
176 DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE))
179 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
180 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
183 #ifndef FUNCTION_ARG_BOUNDARY
184 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
187 #ifndef FUNCTION_ARG_PARTIAL_NREGS
188 #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED) 0
191 tree split_complex_types (tree);
192 tree split_complex_values (tree);
194 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
195 Normally move_insn, so Pmode stack pointer. */
197 #ifndef STACK_SAVEAREA_MODE
198 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
201 /* Supply a default definition of STACK_SIZE_MODE for
202 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
204 #ifndef STACK_SIZE_MODE
205 #define STACK_SIZE_MODE word_mode
208 /* Provide default values for the macros controlling stack checking. */
210 #ifndef STACK_CHECK_BUILTIN
211 #define STACK_CHECK_BUILTIN 0
214 /* The default interval is one page. */
215 #ifndef STACK_CHECK_PROBE_INTERVAL
216 #define STACK_CHECK_PROBE_INTERVAL 4096
219 /* The default is to do a store into the stack. */
220 #ifndef STACK_CHECK_PROBE_LOAD
221 #define STACK_CHECK_PROBE_LOAD 0
224 /* This value is arbitrary, but should be sufficient for most machines. */
225 #ifndef STACK_CHECK_PROTECT
226 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
229 /* Make the maximum frame size be the largest we can and still only need
230 one probe per function. */
231 #ifndef STACK_CHECK_MAX_FRAME_SIZE
232 #define STACK_CHECK_MAX_FRAME_SIZE \
233 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
236 /* This is arbitrary, but should be large enough everywhere. */
237 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
238 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
241 /* Provide a reasonable default for the maximum size of an object to
242 allocate in the fixed frame. We may need to be able to make this
243 controllable by the user at some point. */
244 #ifndef STACK_CHECK_MAX_VAR_SIZE
245 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
248 /* Functions from optabs.c, commonly used, and without need for the optabs
251 /* Passed to expand_simple_binop and expand_binop to say which options
252 to try to use if the requested operation can't be open-coded on the
253 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
254 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
255 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
256 try anything else. */
267 /* Generate code for a simple binary or unary operation. "Simple" in
268 this case means "can be unambiguously described by a (mode, code)
269 pair and mapped to a single optab." */
270 extern rtx expand_simple_binop (enum machine_mode, enum rtx_code, rtx,
271 rtx, rtx, int, enum optab_methods);
272 extern rtx expand_simple_unop (enum machine_mode, enum rtx_code, rtx, rtx,
275 /* Report whether the machine description contains an insn which can
276 perform the operation described by CODE and MODE. */
277 extern int have_insn_for (enum rtx_code, enum machine_mode);
279 /* Emit code to make a call to a constant function or a library call. */
280 extern void emit_libcall_block (rtx, rtx, rtx, rtx);
282 /* Create but don't emit one rtl instruction to perform certain operations.
283 Modes must match; operands must meet the operation's predicates.
284 Likewise for subtraction and for just copying. */
285 extern rtx gen_add2_insn (rtx, rtx);
286 extern rtx gen_add3_insn (rtx, rtx, rtx);
287 extern rtx gen_sub2_insn (rtx, rtx);
288 extern rtx gen_sub3_insn (rtx, rtx, rtx);
289 extern rtx gen_move_insn (rtx, rtx);
290 extern int have_add2_insn (rtx, rtx);
291 extern int have_sub2_insn (rtx, rtx);
293 /* Emit a pair of rtl insns to compare two rtx's and to jump
294 to a label if the comparison is true. */
295 extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx,
296 enum machine_mode, int, rtx);
298 /* Generate code to indirectly jump to a location given in the rtx LOC. */
299 extern void emit_indirect_jump (rtx);
301 /* Generate a conditional trap instruction. */
302 extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
304 #include "insn-config.h"
306 #ifdef HAVE_conditional_move
307 /* Emit a conditional move operation. */
308 rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
309 rtx, rtx, enum machine_mode, int);
311 /* Return nonzero if the conditional move is supported. */
312 int can_conditionally_move_p (enum machine_mode mode);
315 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
316 rtx, rtx, enum machine_mode, int);
319 /* Functions from expmed.c: */
321 /* Arguments MODE, RTX: return an rtx for the negation of that value.
323 extern rtx negate_rtx (enum machine_mode, rtx);
325 /* Expand a logical AND operation. */
326 extern rtx expand_and (enum machine_mode, rtx, rtx, rtx);
328 /* Emit a store-flag operation. */
329 extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
332 /* Like emit_store_flag, but always succeeds. */
333 extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx,
334 enum machine_mode, int, int);
336 /* Functions from builtins.c: */
337 extern rtx expand_builtin (tree, rtx, rtx, enum machine_mode, int);
338 extern tree std_build_builtin_va_list (void);
339 extern void std_expand_builtin_va_start (tree, rtx);
340 extern rtx default_expand_builtin (tree, rtx, rtx, enum machine_mode, int);
341 extern void expand_builtin_setjmp_setup (rtx, rtx);
342 extern void expand_builtin_setjmp_receiver (rtx);
343 extern void expand_builtin_longjmp (rtx, rtx);
344 extern rtx expand_builtin_saveregs (void);
345 extern void expand_builtin_trap (void);
347 /* Functions from expr.c: */
349 /* This is run once per compilation to set up which modes can be used
350 directly in memory and to initialize the block move optab. */
351 extern void init_expr_once (void);
353 /* This is run at the start of compiling a function. */
354 extern void init_expr (void);
356 /* Emit some rtl insns to move data between rtx's, converting machine modes.
357 Both modes must be floating or both fixed. */
358 extern void convert_move (rtx, rtx, int);
360 /* Convert an rtx to specified machine mode and return the result. */
361 extern rtx convert_to_mode (enum machine_mode, rtx, int);
363 /* Convert an rtx to MODE from OLDMODE and return the result. */
364 extern rtx convert_modes (enum machine_mode, enum machine_mode, rtx, int);
366 /* Emit code to move a block Y to a block X. */
368 enum block_op_methods
375 extern void init_block_move_fn (const char *);
376 extern void init_block_clear_fn (const char *);
378 extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods);
380 /* Copy all or part of a value X into registers starting at REGNO.
381 The number of registers to be filled is NREGS. */
382 extern void move_block_to_reg (int, rtx, int, enum machine_mode);
384 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
385 The number of registers to be filled is NREGS. */
386 extern void move_block_from_reg (int, rtx, int);
388 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
389 extern rtx gen_group_rtx (rtx);
391 /* Load a BLKmode value into non-consecutive registers represented by a
393 extern void emit_group_load (rtx, rtx, tree, int);
395 /* Move a non-consecutive group of registers represented by a PARALLEL into
396 a non-consecutive group of registers represented by a PARALLEL. */
397 extern void emit_group_move (rtx, rtx);
399 /* Store a BLKmode value from non-consecutive registers represented by a
401 extern void emit_group_store (rtx, rtx, tree, int);
403 /* Copy BLKmode object from a set of registers. */
404 extern rtx copy_blkmode_from_reg (rtx, rtx, tree);
406 /* Mark REG as holding a parameter for the next CALL_INSN. */
407 extern void use_reg (rtx *, rtx);
409 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
410 for the next CALL_INSN. */
411 extern void use_regs (rtx *, int, int);
413 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
414 extern void use_group_regs (rtx *, rtx);
416 /* Write zeros through the storage of OBJECT.
417 If OBJECT has BLKmode, SIZE is its length in bytes. */
418 extern rtx clear_storage (rtx, rtx);
420 /* Determine whether the LEN bytes can be moved by using several move
421 instructions. Return nonzero if a call to move_by_pieces should
423 extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
425 /* Return nonzero if it is desirable to store LEN bytes generated by
426 CONSTFUN with several move instructions by store_by_pieces
427 function. CONSTFUNDATA is a pointer which will be passed as argument
428 in every CONSTFUN call.
429 ALIGN is maximum alignment we can assume. */
430 extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
431 rtx (*) (void *, HOST_WIDE_INT,
433 void *, unsigned int);
435 /* Generate several move instructions to store LEN bytes generated by
436 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
437 pointer which will be passed as argument in every CONSTFUN call.
438 ALIGN is maximum alignment we can assume.
440 extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT,
441 rtx (*) (void *, HOST_WIDE_INT, enum machine_mode),
442 void *, unsigned int, int);
444 /* Emit insns to set X from Y. */
445 extern rtx emit_move_insn (rtx, rtx);
447 /* Emit insns to set X from Y, with no frills. */
448 extern rtx emit_move_insn_1 (rtx, rtx);
450 /* Push a block of length SIZE (perhaps variable)
451 and return an rtx to address the beginning of the block. */
452 extern rtx push_block (rtx, int, int);
454 /* Generate code to push something onto the stack, given its mode and type. */
455 extern void emit_push_insn (rtx, enum machine_mode, tree, rtx, unsigned int,
456 int, rtx, int, rtx, rtx, int, rtx);
458 /* Expand an assignment that stores the value of FROM into TO. */
459 extern void expand_assignment (tree, tree);
461 /* Generate code for computing expression EXP,
462 and storing the value into TARGET.
463 If SUGGEST_REG is nonzero, copy the value through a register
464 and return that register, if that is possible. */
465 extern rtx store_expr (tree, rtx, int);
467 /* Given an rtx that may include add and multiply operations,
468 generate them as insns and return a pseudo-reg containing the value.
469 Useful after calling expand_expr with 1 as sum_ok. */
470 extern rtx force_operand (rtx, rtx);
472 /* Work horse for expand_expr. */
473 extern rtx expand_expr_real (tree, rtx, enum machine_mode,
474 enum expand_modifier, rtx *);
476 /* Generate code for computing expression EXP.
477 An rtx for the computed value is returned. The value is never null.
478 In the case of a void EXP, const0_rtx is returned. */
480 expand_expr (tree exp, rtx target, enum machine_mode mode,
481 enum expand_modifier modifier)
483 return expand_expr_real (exp, target, mode, modifier, NULL);
486 extern void expand_var (tree);
488 /* At the start of a function, record that we have no previously-pushed
489 arguments waiting to be popped. */
490 extern void init_pending_stack_adjust (void);
492 /* Discard any pending stack adjustment. */
493 extern void discard_pending_stack_adjust (void);
495 /* When exiting from function, if safe, clear out any pending stack adjust
496 so the adjustment won't get done. */
497 extern void clear_pending_stack_adjust (void);
499 /* Pop any previously-pushed arguments that have not been popped yet. */
500 extern void do_pending_stack_adjust (void);
502 /* Return the tree node and offset if a given argument corresponds to
503 a string constant. */
504 extern tree string_constant (tree, tree *);
506 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
507 extern void jumpifnot (tree, rtx);
509 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
510 extern void jumpif (tree, rtx);
512 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
513 the result is zero, or IF_TRUE_LABEL if the result is one. */
514 extern void do_jump (tree, rtx, rtx);
516 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
517 extern rtx compare_from_rtx (rtx, rtx, enum rtx_code, int, enum machine_mode,
519 extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int,
520 enum machine_mode, rtx, rtx, rtx);
522 /* Two different ways of generating switch statements. */
523 extern int try_casesi (tree, tree, tree, tree, rtx, rtx);
524 extern int try_tablejump (tree, tree, tree, tree, rtx, rtx);
526 /* Smallest number of adjacent cases before we use a jump table.
527 XXX Should be a target hook. */
528 extern unsigned int case_values_threshold (void);
530 /* Functions from alias.c */
532 /* extern HOST_WIDE_INT get_varargs_alias_set (void); */
533 /* extern HOST_WIDE_INT get_frame_alias_set (void); */
534 /* extern void record_base_value (unsigned int, rtx, int); */
535 /* extern void record_alias_subset (HOST_WIDE_INT, HOST_WIDE_INT); */
536 /* extern HOST_WIDE_INT new_alias_set (void); */
537 /* extern int can_address_p (tree); */
540 /* rtl.h and tree.h were included. */
541 /* Return an rtx for the size in bytes of the value of an expr. */
542 extern rtx expr_size (tree);
544 /* Return a wide integer for the size in bytes of the value of EXP, or -1
545 if the size can vary or is larger than an integer. */
546 extern HOST_WIDE_INT int_expr_size (tree);
548 /* Return the address of the trampoline for entering nested fn FUNCTION. */
549 extern rtx trampoline_address (tree);
551 /* Return an rtx that refers to the value returned by a function
552 in its original home. This becomes invalid if any more code is emitted. */
553 extern rtx hard_function_value (tree, tree, int);
555 extern rtx prepare_call_address (rtx, rtx, rtx *, int, int);
557 extern rtx expand_call (tree, rtx, int);
559 extern void fixup_tail_calls (void);
562 extern rtx expand_shift (enum tree_code, enum machine_mode, rtx, tree, rtx,
564 extern rtx expand_divmod (int, enum tree_code, enum machine_mode, rtx, rtx,
568 extern void locate_and_pad_parm (enum machine_mode, tree, int, int, tree,
570 struct locate_and_pad_arg_data *);
572 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
573 extern rtx label_rtx (tree);
575 /* As label_rtx, but additionally the label is placed on the forced label
576 list of its containing function (i.e. it is treated as reachable even
577 if how is not obvious). */
578 extern rtx force_label_rtx (tree);
580 /* Indicate how an input argument register was promoted. */
581 extern rtx promoted_input_arg (unsigned int, enum machine_mode *, int *);
583 /* Return an rtx like arg but sans any constant terms.
584 Returns the original rtx if it has no constant terms.
585 The constant terms are added and stored via a second arg. */
586 extern rtx eliminate_constant_term (rtx, rtx *);
588 /* Convert arg to a valid memory address for specified machine mode,
589 by emitting insns to perform arithmetic if nec. */
590 extern rtx memory_address (enum machine_mode, rtx);
592 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
593 extern rtx memory_address_noforce (enum machine_mode, rtx);
595 /* Return a memory reference like MEMREF, but with its mode changed
596 to MODE and its address changed to ADDR.
597 (VOIDmode means don't change the mode.
598 NULL for ADDR means don't change the address.) */
599 extern rtx change_address (rtx, enum machine_mode, rtx);
601 /* Return a memory reference like MEMREF, but with its mode changed
602 to MODE and its address offset by OFFSET bytes. */
603 #define adjust_address(MEMREF, MODE, OFFSET) \
604 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
606 /* Likewise, but the reference is not required to be valid. */
607 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
608 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
610 /* Return a memory reference like MEMREF, but with its mode changed
611 to MODE and its address changed to ADDR, which is assumed to be
612 increased by OFFSET bytes from MEMREF. */
613 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
614 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
616 /* Likewise, but the reference is not required to be valid. */
617 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
618 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
620 extern rtx adjust_address_1 (rtx, enum machine_mode, HOST_WIDE_INT, int, int);
621 extern rtx adjust_automodify_address_1 (rtx, enum machine_mode, rtx,
624 /* Return a memory reference like MEMREF, but whose address is changed by
625 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
626 known to be in OFFSET (possibly 1). */
627 extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT);
629 /* Definitions from emit-rtl.c */
630 #include "emit-rtl.h"
632 /* Return a memory reference like MEMREF, but with its mode widened to
633 MODE and adjusted by OFFSET. */
634 extern rtx widen_memory_access (rtx, enum machine_mode, HOST_WIDE_INT);
636 /* Return a memory reference like MEMREF, but which is known to have a
638 extern rtx validize_mem (rtx);
640 /* Given REF, a MEM, and T, either the type of X or the expression
641 corresponding to REF, set the memory attributes. OBJECTP is nonzero
642 if we are making a new object of this type. */
643 extern void set_mem_attributes (rtx, tree, int);
645 /* Similar, except that BITPOS has not yet been applied to REF, so if
646 we alter MEM_OFFSET according to T then we should subtract BITPOS
647 expecting that it'll be added back in later. */
648 extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT);
650 /* Assemble the static constant template for function entry trampolines. */
651 extern rtx assemble_trampoline_template (void);
653 /* Given rtx, return new rtx whose address won't be affected by
654 any side effects. It has been copied to a new temporary reg. */
655 extern rtx stabilize (rtx);
657 /* Given an rtx, copy all regs it refers to into new temps
658 and return a modified copy that refers to the new temps. */
659 extern rtx copy_all_regs (rtx);
661 /* Copy given rtx to a new temp reg and return that. */
662 extern rtx copy_to_reg (rtx);
664 /* Like copy_to_reg but always make the reg Pmode. */
665 extern rtx copy_addr_to_reg (rtx);
667 /* Like copy_to_reg but always make the reg the specified mode MODE. */
668 extern rtx copy_to_mode_reg (enum machine_mode, rtx);
670 /* Copy given rtx to given temp reg and return that. */
671 extern rtx copy_to_suggested_reg (rtx, rtx, enum machine_mode);
673 /* Copy a value to a register if it isn't already a register.
674 Args are mode (in case value is a constant) and the value. */
675 extern rtx force_reg (enum machine_mode, rtx);
677 /* Return given rtx, copied into a new temp reg if it was in memory. */
678 extern rtx force_not_mem (rtx);
680 /* Return mode and signedness to use when object is promoted. */
681 extern enum machine_mode promote_mode (tree, enum machine_mode, int *, int);
683 /* Remove some bytes from the stack. An rtx says how many. */
684 extern void adjust_stack (rtx);
686 /* Add some bytes to the stack. An rtx says how many. */
687 extern void anti_adjust_stack (rtx);
689 /* This enum is used for the following two functions. */
690 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
692 /* Save the stack pointer at the specified level. */
693 extern void emit_stack_save (enum save_level, rtx *, rtx);
695 /* Restore the stack pointer from a save area of the specified level. */
696 extern void emit_stack_restore (enum save_level, rtx, rtx);
698 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */
699 extern void update_nonlocal_goto_save_area (void);
701 /* Allocate some space on the stack dynamically and return its address. An rtx
702 says how many bytes. */
703 extern rtx allocate_dynamic_stack_space (rtx, rtx, int);
705 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
706 FIRST is a constant and size is a Pmode RTX. These are offsets from the
707 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
708 subtract from the stack. If SIZE is constant, this is done
709 with a fixed number of probes. Otherwise, we must make a loop. */
710 extern void probe_stack_range (HOST_WIDE_INT, rtx);
712 /* Return an rtx that refers to the value returned by a library call
713 in its original home. This becomes invalid if any more code is emitted. */
714 extern rtx hard_libcall_value (enum machine_mode);
716 /* Given an rtx, return an rtx for a value rounded up to a multiple
717 of STACK_BOUNDARY / BITS_PER_UNIT. */
718 extern rtx round_push (rtx);
720 /* Return the mode desired by operand N of a particular bitfield
721 insert/extract insn, or MAX_MACHINE_MODE if no such insn is
724 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
725 extern enum machine_mode
726 mode_for_extraction (enum extraction_pattern, int);
728 extern rtx store_bit_field (rtx, unsigned HOST_WIDE_INT,
729 unsigned HOST_WIDE_INT, enum machine_mode, rtx);
730 extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT,
731 unsigned HOST_WIDE_INT, int, rtx,
732 enum machine_mode, enum machine_mode);
733 extern rtx expand_mult (enum machine_mode, rtx, rtx, rtx, int);
734 extern bool const_mult_add_overflow_p (rtx, rtx, rtx, enum machine_mode, int);
735 extern rtx expand_mult_add (rtx, rtx, rtx, rtx,enum machine_mode, int);
736 extern rtx expand_mult_highpart_adjust (enum machine_mode, rtx, rtx, rtx, rtx, int);
738 extern rtx assemble_static_space (unsigned HOST_WIDE_INT);
739 extern int safe_from_p (rtx, tree, int);
741 /* Call this once to initialize the contents of the optabs
742 appropriately for the current target machine. */
743 extern void init_optabs (void);
744 extern void init_all_optabs (void);
746 /* Call this to initialize an optab function entry. */
747 extern rtx init_one_libfunc (const char *);
749 extern void do_jump_by_parts_equality_rtx (rtx, rtx, rtx);
750 extern void do_jump_by_parts_greater_rtx (enum machine_mode, int, rtx, rtx,
753 extern int vector_mode_valid_p (enum machine_mode);
755 #endif /* GCC_EXPR_H */