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
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 2, 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 COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
26 /* For inhibit_defer_pop */
28 /* For XEXP, GEN_INT, rtx_code */
30 /* For optimize_size */
32 /* For host_integerp, tree_low_cst, convert, size_binop, ssize_int, TREE_CODE,
33 TYPE_SIZE, int_size_in_bytes, */
35 /* For GET_MODE_BITSIZE, word_mode */
38 /* The default branch cost is 1. */
43 /* This is the 4th arg to `expand_expr'.
44 EXPAND_STACK_PARM means we are possibly expanding a call param onto
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
, 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 setmem or libcall instead. */
81 #if defined (HAVE_setmemqi) || defined (HAVE_setmemhi) || defined (HAVE_setmemsi) || defined (HAVE_setmemdi) || defined (HAVE_setmemti)
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
;
120 /* slot_offset is at least this aligned. */
121 unsigned int boundary
;
124 /* Add the value of the tree INC to the `struct args_size' TO. */
126 #define ADD_PARM_SIZE(TO, INC) \
129 if (host_integerp (inc, 0)) \
130 (TO).constant += tree_low_cst (inc, 0); \
131 else if ((TO).var == 0) \
132 (TO).var = convert (ssizetype, inc); \
134 (TO).var = size_binop (PLUS_EXPR, (TO).var, \
135 convert (ssizetype, inc)); \
138 #define SUB_PARM_SIZE(TO, DEC) \
141 if (host_integerp (dec, 0)) \
142 (TO).constant -= tree_low_cst (dec, 0); \
143 else if ((TO).var == 0) \
144 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \
145 convert (ssizetype, dec)); \
147 (TO).var = size_binop (MINUS_EXPR, (TO).var, \
148 convert (ssizetype, dec)); \
151 /* Convert the implicit sum in a `struct args_size' into a tree
152 of type ssizetype. */
153 #define ARGS_SIZE_TREE(SIZE) \
154 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \
155 : size_binop (PLUS_EXPR, convert (ssizetype, (SIZE).var), \
156 ssize_int ((SIZE).constant)))
158 /* Convert the implicit sum in a `struct args_size' into an rtx. */
159 #define ARGS_SIZE_RTX(SIZE) \
160 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
161 : expand_normal (ARGS_SIZE_TREE (SIZE)))
163 /* Supply a default definition for FUNCTION_ARG_PADDING:
164 usually pad upward, but pad short args downward on
165 big-endian machines. */
167 #define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE) \
168 (! BYTES_BIG_ENDIAN \
170 : (((MODE) == BLKmode \
171 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
172 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
173 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
174 ? downward : upward))
176 #ifndef FUNCTION_ARG_PADDING
177 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
178 DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE))
181 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
182 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
185 #ifndef FUNCTION_ARG_BOUNDARY
186 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
189 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
190 Normally move_insn, so Pmode stack pointer. */
192 #ifndef STACK_SAVEAREA_MODE
193 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
196 /* Supply a default definition of STACK_SIZE_MODE for
197 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
199 #ifndef STACK_SIZE_MODE
200 #define STACK_SIZE_MODE word_mode
203 /* Provide default values for the macros controlling stack checking. */
205 #ifndef STACK_CHECK_BUILTIN
206 #define STACK_CHECK_BUILTIN 0
209 /* The default interval is one page. */
210 #ifndef STACK_CHECK_PROBE_INTERVAL
211 #define STACK_CHECK_PROBE_INTERVAL 4096
214 /* The default is to do a store into the stack. */
215 #ifndef STACK_CHECK_PROBE_LOAD
216 #define STACK_CHECK_PROBE_LOAD 0
219 /* This value is arbitrary, but should be sufficient for most machines. */
220 #ifndef STACK_CHECK_PROTECT
221 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
224 /* Make the maximum frame size be the largest we can and still only need
225 one probe per function. */
226 #ifndef STACK_CHECK_MAX_FRAME_SIZE
227 #define STACK_CHECK_MAX_FRAME_SIZE \
228 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
231 /* This is arbitrary, but should be large enough everywhere. */
232 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
233 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
236 /* Provide a reasonable default for the maximum size of an object to
237 allocate in the fixed frame. We may need to be able to make this
238 controllable by the user at some point. */
239 #ifndef STACK_CHECK_MAX_VAR_SIZE
240 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
243 /* Functions from optabs.c, commonly used, and without need for the optabs
246 /* Passed to expand_simple_binop and expand_binop to say which options
247 to try to use if the requested operation can't be open-coded on the
248 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
249 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
250 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
251 try anything else. */
262 /* Generate code for a simple binary or unary operation. "Simple" in
263 this case means "can be unambiguously described by a (mode, code)
264 pair and mapped to a single optab." */
265 extern rtx
expand_simple_binop (enum machine_mode
, enum rtx_code
, rtx
,
266 rtx
, rtx
, int, enum optab_methods
);
267 extern rtx
expand_simple_unop (enum machine_mode
, enum rtx_code
, rtx
, rtx
,
270 /* Report whether the machine description contains an insn which can
271 perform the operation described by CODE and MODE. */
272 extern int have_insn_for (enum rtx_code
, enum machine_mode
);
274 /* Emit code to make a call to a constant function or a library call. */
275 extern void emit_libcall_block (rtx
, rtx
, rtx
, rtx
);
277 /* Create but don't emit one rtl instruction to perform certain operations.
278 Modes must match; operands must meet the operation's predicates.
279 Likewise for subtraction and for just copying. */
280 extern rtx
gen_add2_insn (rtx
, rtx
);
281 extern rtx
gen_add3_insn (rtx
, rtx
, rtx
);
282 extern rtx
gen_sub2_insn (rtx
, rtx
);
283 extern rtx
gen_sub3_insn (rtx
, rtx
, rtx
);
284 extern rtx
gen_move_insn (rtx
, rtx
);
285 extern int have_add2_insn (rtx
, rtx
);
286 extern int have_sub2_insn (rtx
, rtx
);
288 /* Emit a pair of rtl insns to compare two rtx's and to jump
289 to a label if the comparison is true. */
290 extern void emit_cmp_and_jump_insns (rtx
, rtx
, enum rtx_code
, rtx
,
291 enum machine_mode
, int, rtx
);
293 /* Generate code to indirectly jump to a location given in the rtx LOC. */
294 extern void emit_indirect_jump (rtx
);
296 /* Generate a conditional trap instruction. */
297 extern rtx
gen_cond_trap (enum rtx_code
, rtx
, rtx
, rtx
);
299 #include "insn-config.h"
301 #ifdef HAVE_conditional_move
302 /* Emit a conditional move operation. */
303 rtx
emit_conditional_move (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
304 rtx
, rtx
, enum machine_mode
, int);
306 /* Return nonzero if the conditional move is supported. */
307 int can_conditionally_move_p (enum machine_mode mode
);
310 rtx
emit_conditional_add (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
311 rtx
, rtx
, enum machine_mode
, int);
313 rtx
expand_val_compare_and_swap (rtx
, rtx
, rtx
, rtx
);
314 rtx
expand_bool_compare_and_swap (rtx
, rtx
, rtx
, rtx
);
315 rtx
expand_sync_operation (rtx
, rtx
, enum rtx_code
);
316 rtx
expand_sync_fetch_operation (rtx
, rtx
, enum rtx_code
, bool, rtx
);
317 rtx
expand_sync_lock_test_and_set (rtx
, rtx
, rtx
);
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 rtx
default_expand_library_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
342 extern void expand_builtin_setjmp_setup (rtx
, rtx
);
343 extern void expand_builtin_setjmp_receiver (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
373 /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */
377 extern void init_block_move_fn (const char *);
378 extern void init_block_clear_fn (const char *);
380 extern rtx
emit_block_move (rtx
, rtx
, rtx
, enum block_op_methods
);
382 /* Copy all or part of a value X into registers starting at REGNO.
383 The number of registers to be filled is NREGS. */
384 extern void move_block_to_reg (int, rtx
, int, enum machine_mode
);
386 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
387 The number of registers to be filled is NREGS. */
388 extern void move_block_from_reg (int, rtx
, int);
390 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
391 extern rtx
gen_group_rtx (rtx
);
393 /* Load a BLKmode value into non-consecutive registers represented by a
395 extern void emit_group_load (rtx
, rtx
, tree
, int);
397 /* Similarly, but load into new temporaries. */
398 extern rtx
emit_group_load_into_temps (rtx
, rtx
, tree
, int);
400 /* Move a non-consecutive group of registers represented by a PARALLEL into
401 a non-consecutive group of registers represented by a PARALLEL. */
402 extern void emit_group_move (rtx
, rtx
);
404 /* Move a group of registers represented by a PARALLEL into pseudos. */
405 extern rtx
emit_group_move_into_temps (rtx
);
407 /* Store a BLKmode value from non-consecutive registers represented by a
409 extern void emit_group_store (rtx
, rtx
, tree
, int);
411 /* Copy BLKmode object from a set of registers. */
412 extern rtx
copy_blkmode_from_reg (rtx
, rtx
, tree
);
414 /* Mark REG as holding a parameter for the next CALL_INSN. */
415 extern void use_reg (rtx
*, rtx
);
417 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
418 for the next CALL_INSN. */
419 extern void use_regs (rtx
*, int, int);
421 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
422 extern void use_group_regs (rtx
*, rtx
);
424 /* Write zeros through the storage of OBJECT.
425 If OBJECT has BLKmode, SIZE is its length in bytes. */
426 extern rtx
clear_storage (rtx
, rtx
, enum block_op_methods
);
428 /* Expand a setmem pattern; return true if successful. */
429 extern bool set_storage_via_setmem (rtx
, rtx
, rtx
, unsigned int);
431 /* Determine whether the LEN bytes can be moved by using several move
432 instructions. Return nonzero if a call to move_by_pieces should
434 extern int can_move_by_pieces (unsigned HOST_WIDE_INT
, unsigned int);
436 /* Return nonzero if it is desirable to store LEN bytes generated by
437 CONSTFUN with several move instructions by store_by_pieces
438 function. CONSTFUNDATA is a pointer which will be passed as argument
439 in every CONSTFUN call.
440 ALIGN is maximum alignment we can assume. */
441 extern int can_store_by_pieces (unsigned HOST_WIDE_INT
,
442 rtx (*) (void *, HOST_WIDE_INT
,
444 void *, unsigned int);
446 /* Generate several move instructions to store LEN bytes generated by
447 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
448 pointer which will be passed as argument in every CONSTFUN call.
449 ALIGN is maximum alignment we can assume.
451 extern rtx
store_by_pieces (rtx
, unsigned HOST_WIDE_INT
,
452 rtx (*) (void *, HOST_WIDE_INT
, enum machine_mode
),
453 void *, unsigned int, int);
455 /* Emit insns to set X from Y. */
456 extern rtx
emit_move_insn (rtx
, rtx
);
458 /* Emit insns to set X from Y, with no frills. */
459 extern rtx
emit_move_insn_1 (rtx
, rtx
);
461 /* Push a block of length SIZE (perhaps variable)
462 and return an rtx to address the beginning of the block. */
463 extern rtx
push_block (rtx
, int, int);
465 /* Generate code to push something onto the stack, given its mode and type. */
466 extern void emit_push_insn (rtx
, enum machine_mode
, tree
, rtx
, unsigned int,
467 int, rtx
, int, rtx
, rtx
, int, rtx
);
469 /* Expand an assignment that stores the value of FROM into TO. */
470 extern void expand_assignment (tree
, tree
);
472 /* Generate code for computing expression EXP,
473 and storing the value into TARGET.
474 If SUGGEST_REG is nonzero, copy the value through a register
475 and return that register, if that is possible. */
476 extern rtx
store_expr (tree
, rtx
, int);
478 /* Given an rtx that may include add and multiply operations,
479 generate them as insns and return a pseudo-reg containing the value.
480 Useful after calling expand_expr with 1 as sum_ok. */
481 extern rtx
force_operand (rtx
, rtx
);
483 /* Work horse for expand_expr. */
484 extern rtx
expand_expr_real (tree
, rtx
, enum machine_mode
,
485 enum expand_modifier
, rtx
*);
487 /* Generate code for computing expression EXP.
488 An rtx for the computed value is returned. The value is never null.
489 In the case of a void EXP, const0_rtx is returned. */
491 expand_expr (tree exp
, rtx target
, enum machine_mode mode
,
492 enum expand_modifier modifier
)
494 return expand_expr_real (exp
, target
, mode
, modifier
, NULL
);
498 expand_normal (tree exp
)
500 return expand_expr_real (exp
, NULL_RTX
, VOIDmode
, EXPAND_NORMAL
, NULL
);
503 extern void expand_var (tree
);
505 /* At the start of a function, record that we have no previously-pushed
506 arguments waiting to be popped. */
507 extern void init_pending_stack_adjust (void);
509 /* Discard any pending stack adjustment. */
510 extern void discard_pending_stack_adjust (void);
512 /* When exiting from function, if safe, clear out any pending stack adjust
513 so the adjustment won't get done. */
514 extern void clear_pending_stack_adjust (void);
516 /* Pop any previously-pushed arguments that have not been popped yet. */
517 extern void do_pending_stack_adjust (void);
519 /* Return the tree node and offset if a given argument corresponds to
520 a string constant. */
521 extern tree
string_constant (tree
, tree
*);
523 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
524 extern void jumpifnot (tree
, rtx
);
526 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
527 extern void jumpif (tree
, rtx
);
529 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
530 the result is zero, or IF_TRUE_LABEL if the result is one. */
531 extern void do_jump (tree
, rtx
, rtx
);
533 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
534 extern rtx
compare_from_rtx (rtx
, rtx
, enum rtx_code
, int, enum machine_mode
,
536 extern void do_compare_rtx_and_jump (rtx
, rtx
, enum rtx_code
, int,
537 enum machine_mode
, rtx
, rtx
, rtx
);
539 /* Two different ways of generating switch statements. */
540 extern int try_casesi (tree
, tree
, tree
, tree
, rtx
, rtx
);
541 extern int try_tablejump (tree
, tree
, tree
, tree
, rtx
, rtx
);
543 /* Smallest number of adjacent cases before we use a jump table.
544 XXX Should be a target hook. */
545 extern unsigned int case_values_threshold (void);
547 /* Functions from alias.c */
551 /* rtl.h and tree.h were included. */
552 /* Return an rtx for the size in bytes of the value of an expr. */
553 extern rtx
expr_size (tree
);
555 /* Return a wide integer for the size in bytes of the value of EXP, or -1
556 if the size can vary or is larger than an integer. */
557 extern HOST_WIDE_INT
int_expr_size (tree
);
559 /* Return an rtx that refers to the value returned by a function
560 in its original home. This becomes invalid if any more code is emitted. */
561 extern rtx
hard_function_value (tree
, tree
, tree
, int);
563 extern rtx
prepare_call_address (rtx
, rtx
, rtx
*, int, int);
565 extern bool shift_return_value (enum machine_mode
, bool, rtx
);
567 extern rtx
expand_call (tree
, rtx
, int);
569 extern void fixup_tail_calls (void);
572 extern rtx
expand_shift (enum tree_code
, enum machine_mode
, rtx
, tree
, rtx
,
574 extern rtx
expand_divmod (int, enum tree_code
, enum machine_mode
, rtx
, rtx
,
578 extern void locate_and_pad_parm (enum machine_mode
, tree
, int, int, tree
,
580 struct locate_and_pad_arg_data
*);
582 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
583 extern rtx
label_rtx (tree
);
585 /* As label_rtx, but additionally the label is placed on the forced label
586 list of its containing function (i.e. it is treated as reachable even
587 if how is not obvious). */
588 extern rtx
force_label_rtx (tree
);
590 /* Indicate how an input argument register was promoted. */
591 extern rtx
promoted_input_arg (unsigned int, enum machine_mode
*, int *);
593 /* Return an rtx like arg but sans any constant terms.
594 Returns the original rtx if it has no constant terms.
595 The constant terms are added and stored via a second arg. */
596 extern rtx
eliminate_constant_term (rtx
, rtx
*);
598 /* Convert arg to a valid memory address for specified machine mode,
599 by emitting insns to perform arithmetic if nec. */
600 extern rtx
memory_address (enum machine_mode
, rtx
);
602 /* Like `memory_address' but pretend `flag_force_addr' is 0. */
603 extern rtx
memory_address_noforce (enum machine_mode
, rtx
);
605 /* Return a memory reference like MEMREF, but with its mode changed
606 to MODE and its address changed to ADDR.
607 (VOIDmode means don't change the mode.
608 NULL for ADDR means don't change the address.) */
609 extern rtx
change_address (rtx
, enum machine_mode
, rtx
);
611 /* Return a memory reference like MEMREF, but with its mode changed
612 to MODE and its address offset by OFFSET bytes. */
613 #define adjust_address(MEMREF, MODE, OFFSET) \
614 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
616 /* Likewise, but the reference is not required to be valid. */
617 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
618 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
620 /* Return a memory reference like MEMREF, but with its mode changed
621 to MODE and its address changed to ADDR, which is assumed to be
622 increased by OFFSET bytes from MEMREF. */
623 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
624 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
626 /* Likewise, but the reference is not required to be valid. */
627 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
628 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
630 extern rtx
adjust_address_1 (rtx
, enum machine_mode
, HOST_WIDE_INT
, int, int);
631 extern rtx
adjust_automodify_address_1 (rtx
, enum machine_mode
, rtx
,
634 /* Return a memory reference like MEMREF, but whose address is changed by
635 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
636 known to be in OFFSET (possibly 1). */
637 extern rtx
offset_address (rtx
, rtx
, unsigned HOST_WIDE_INT
);
639 /* Definitions from emit-rtl.c */
640 #include "emit-rtl.h"
642 /* Return a memory reference like MEMREF, but with its mode widened to
643 MODE and adjusted by OFFSET. */
644 extern rtx
widen_memory_access (rtx
, enum machine_mode
, HOST_WIDE_INT
);
646 /* Return a memory reference like MEMREF, but which is known to have a
648 extern rtx
validize_mem (rtx
);
650 extern rtx
use_anchored_address (rtx
);
652 /* Given REF, a MEM, and T, either the type of X or the expression
653 corresponding to REF, set the memory attributes. OBJECTP is nonzero
654 if we are making a new object of this type. */
655 extern void set_mem_attributes (rtx
, tree
, int);
657 /* Similar, except that BITPOS has not yet been applied to REF, so if
658 we alter MEM_OFFSET according to T then we should subtract BITPOS
659 expecting that it'll be added back in later. */
660 extern void set_mem_attributes_minus_bitpos (rtx
, tree
, int, HOST_WIDE_INT
);
662 /* Assemble the static constant template for function entry trampolines. */
663 extern rtx
assemble_trampoline_template (void);
665 /* Copy given rtx to a new temp reg and return that. */
666 extern rtx
copy_to_reg (rtx
);
668 /* Like copy_to_reg but always make the reg Pmode. */
669 extern rtx
copy_addr_to_reg (rtx
);
671 /* Like copy_to_reg but always make the reg the specified mode MODE. */
672 extern rtx
copy_to_mode_reg (enum machine_mode
, rtx
);
674 /* Copy given rtx to given temp reg and return that. */
675 extern rtx
copy_to_suggested_reg (rtx
, rtx
, enum machine_mode
);
677 /* Copy a value to a register if it isn't already a register.
678 Args are mode (in case value is a constant) and the value. */
679 extern rtx
force_reg (enum machine_mode
, rtx
);
681 /* Return given rtx, copied into a new temp reg if it was in memory. */
682 extern rtx
force_not_mem (rtx
);
684 /* Return mode and signedness to use when object is promoted. */
685 extern enum machine_mode
promote_mode (tree
, enum machine_mode
, int *, int);
687 /* Remove some bytes from the stack. An rtx says how many. */
688 extern void adjust_stack (rtx
);
690 /* Add some bytes to the stack. An rtx says how many. */
691 extern void anti_adjust_stack (rtx
);
693 /* This enum is used for the following two functions. */
694 enum save_level
{SAVE_BLOCK
, SAVE_FUNCTION
, SAVE_NONLOCAL
};
696 /* Save the stack pointer at the specified level. */
697 extern void emit_stack_save (enum save_level
, rtx
*, rtx
);
699 /* Restore the stack pointer from a save area of the specified level. */
700 extern void emit_stack_restore (enum save_level
, rtx
, rtx
);
702 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */
703 extern void update_nonlocal_goto_save_area (void);
705 /* Allocate some space on the stack dynamically and return its address. An rtx
706 says how many bytes. */
707 extern rtx
allocate_dynamic_stack_space (rtx
, rtx
, int);
709 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
710 FIRST is a constant and size is a Pmode RTX. These are offsets from the
711 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
712 subtract from the stack. If SIZE is constant, this is done
713 with a fixed number of probes. Otherwise, we must make a loop. */
714 extern void probe_stack_range (HOST_WIDE_INT
, rtx
);
716 /* Return an rtx that refers to the value returned by a library call
717 in its original home. This becomes invalid if any more code is emitted. */
718 extern rtx
hard_libcall_value (enum machine_mode
);
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 rtx
expand_mult_add (rtx
, rtx
, rtx
, rtx
,enum machine_mode
, int);
735 extern rtx
expand_mult_highpart_adjust (enum machine_mode
, rtx
, rtx
, rtx
, rtx
, int);
737 extern rtx
assemble_static_space (unsigned HOST_WIDE_INT
);
738 extern int safe_from_p (rtx
, tree
, int);
740 /* Call this once to initialize the contents of the optabs
741 appropriately for the current target machine. */
742 extern void init_optabs (void);
743 extern void init_all_optabs (void);
745 /* Call this to initialize an optab function entry. */
746 extern rtx
init_one_libfunc (const char *);
748 extern int vector_mode_valid_p (enum machine_mode
);
750 #endif /* GCC_EXPR_H */