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 #include "insn-config.h"
303 #ifdef HAVE_conditional_move
304 /* Emit a conditional move operation. */
305 rtx
emit_conditional_move (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
306 rtx
, rtx
, enum machine_mode
, int);
308 /* Return nonzero if the conditional move is supported. */
309 int can_conditionally_move_p (enum machine_mode mode
);
312 rtx
emit_conditional_add (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
313 rtx
, rtx
, enum machine_mode
, int);
316 /* Functions from expmed.c: */
318 /* Arguments MODE, RTX: return an rtx for the negation of that value.
320 extern rtx
negate_rtx (enum machine_mode
, rtx
);
322 /* Expand a logical AND operation. */
323 extern rtx
expand_and (enum machine_mode
, rtx
, rtx
, rtx
);
325 /* Emit a store-flag operation. */
326 extern rtx
emit_store_flag (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
329 /* Like emit_store_flag, but always succeeds. */
330 extern rtx
emit_store_flag_force (rtx
, enum rtx_code
, rtx
, rtx
,
331 enum machine_mode
, int, int);
333 /* Functions from loop.c: */
335 /* Given an insn and condition, return a canonical description of
336 the test being made. */
337 extern rtx
canonicalize_condition (rtx
, rtx
, int, rtx
*, rtx
, int, int);
339 /* Given a JUMP_INSN, return a canonical description of the test
341 extern rtx
get_condition (rtx
, rtx
*, int, int);
343 /* Generate a conditional trap instruction. */
344 extern rtx
gen_cond_trap (enum rtx_code
, rtx
, rtx
, rtx
);
346 /* Functions from builtins.c: */
347 extern rtx
expand_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
348 extern tree
std_build_builtin_va_list (void);
349 extern void std_expand_builtin_va_start (tree
, rtx
);
350 extern rtx
default_expand_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
351 extern void expand_builtin_setjmp_setup (rtx
, rtx
);
352 extern void expand_builtin_setjmp_receiver (rtx
);
353 extern void expand_builtin_longjmp (rtx
, rtx
);
354 extern rtx
expand_builtin_saveregs (void);
355 extern void expand_builtin_trap (void);
357 /* Functions from expr.c: */
359 /* This is run once per compilation to set up which modes can be used
360 directly in memory and to initialize the block move optab. */
361 extern void init_expr_once (void);
363 /* This is run at the start of compiling a function. */
364 extern void init_expr (void);
366 /* Emit some rtl insns to move data between rtx's, converting machine modes.
367 Both modes must be floating or both fixed. */
368 extern void convert_move (rtx
, rtx
, int);
370 /* Convert an rtx to specified machine mode and return the result. */
371 extern rtx
convert_to_mode (enum machine_mode
, rtx
, int);
373 /* Convert an rtx to MODE from OLDMODE and return the result. */
374 extern rtx
convert_modes (enum machine_mode
, enum machine_mode
, rtx
, int);
376 /* Emit code to move a block Y to a block X. */
378 enum block_op_methods
385 extern void init_block_move_fn (const char *);
386 extern void init_block_clear_fn (const char *);
388 extern rtx
emit_block_move (rtx
, rtx
, rtx
, enum block_op_methods
);
390 /* Copy all or part of a value X into registers starting at REGNO.
391 The number of registers to be filled is NREGS. */
392 extern void move_block_to_reg (int, rtx
, int, enum machine_mode
);
394 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
395 The number of registers to be filled is NREGS. */
396 extern void move_block_from_reg (int, rtx
, int);
398 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
399 extern rtx
gen_group_rtx (rtx
);
401 /* Load a BLKmode value into non-consecutive registers represented by a
403 extern void emit_group_load (rtx
, rtx
, tree
, int);
405 /* Move a non-consecutive group of registers represented by a PARALLEL into
406 a non-consecutive group of registers represented by a PARALLEL. */
407 extern void emit_group_move (rtx
, rtx
);
409 /* Store a BLKmode value from non-consecutive registers represented by a
411 extern void emit_group_store (rtx
, rtx
, tree
, int);
413 /* Copy BLKmode object from a set of registers. */
414 extern rtx
copy_blkmode_from_reg (rtx
, rtx
, tree
);
416 /* Mark REG as holding a parameter for the next CALL_INSN. */
417 extern void use_reg (rtx
*, rtx
);
419 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
420 for the next CALL_INSN. */
421 extern void use_regs (rtx
*, int, int);
423 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
424 extern void use_group_regs (rtx
*, rtx
);
426 /* Write zeros through the storage of OBJECT.
427 If OBJECT has BLKmode, SIZE is its length in bytes. */
428 extern rtx
clear_storage (rtx
, rtx
);
430 /* Determine whether the LEN bytes can be moved by using several move
431 instructions. Return nonzero if a call to move_by_pieces should
433 extern int can_move_by_pieces (unsigned HOST_WIDE_INT
, unsigned int);
435 /* Return nonzero if it is desirable to store LEN bytes generated by
436 CONSTFUN with several move instructions by store_by_pieces
437 function. CONSTFUNDATA is a pointer which will be passed as argument
438 in every CONSTFUN call.
439 ALIGN is maximum alignment we can assume. */
440 extern int can_store_by_pieces (unsigned HOST_WIDE_INT
,
441 rtx (*) (void *, HOST_WIDE_INT
,
443 void *, unsigned int);
445 /* Generate several move instructions to store LEN bytes generated by
446 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
447 pointer which will be passed as argument in every CONSTFUN call.
448 ALIGN is maximum alignment we can assume.
450 extern rtx
store_by_pieces (rtx
, unsigned HOST_WIDE_INT
,
451 rtx (*) (void *, HOST_WIDE_INT
, enum machine_mode
),
452 void *, unsigned int, int);
454 /* Emit insns to set X from Y. */
455 extern rtx
emit_move_insn (rtx
, rtx
);
457 /* Emit insns to set X from Y, with no frills. */
458 extern rtx
emit_move_insn_1 (rtx
, rtx
);
460 /* Push a block of length SIZE (perhaps variable)
461 and return an rtx to address the beginning of the block. */
462 extern rtx
push_block (rtx
, int, int);
464 /* Generate code to push something onto the stack, given its mode and type. */
465 extern void emit_push_insn (rtx
, enum machine_mode
, tree
, rtx
, unsigned int,
466 int, rtx
, int, rtx
, rtx
, int, rtx
);
468 /* Expand an assignment that stores the value of FROM into TO. */
469 extern void expand_assignment (tree
, tree
);
471 /* Generate code for computing expression EXP,
472 and storing the value into TARGET.
473 If SUGGEST_REG is nonzero, copy the value through a register
474 and return that register, if that is possible. */
475 extern rtx
store_expr (tree
, rtx
, int);
477 /* Given an rtx that may include add and multiply operations,
478 generate them as insns and return a pseudo-reg containing the value.
479 Useful after calling expand_expr with 1 as sum_ok. */
480 extern rtx
force_operand (rtx
, rtx
);
482 /* Work horse for expand_expr. */
483 extern rtx
expand_expr_real (tree
, rtx
, enum machine_mode
,
484 enum expand_modifier
, rtx
*);
486 /* Generate code for computing expression EXP.
487 An rtx for the computed value is returned. The value is never null.
488 In the case of a void EXP, const0_rtx is returned. */
490 expand_expr (tree exp
, rtx target
, enum machine_mode mode
,
491 enum expand_modifier modifier
)
493 return expand_expr_real (exp
, target
, mode
, modifier
, NULL
);
496 extern void expand_var (tree
);
498 /* At the start of a function, record that we have no previously-pushed
499 arguments waiting to be popped. */
500 extern void init_pending_stack_adjust (void);
502 /* Discard any pending stack adjustment. */
503 extern void discard_pending_stack_adjust (void);
505 /* When exiting from function, if safe, clear out any pending stack adjust
506 so the adjustment won't get done. */
507 extern void clear_pending_stack_adjust (void);
509 /* Pop any previously-pushed arguments that have not been popped yet. */
510 extern void do_pending_stack_adjust (void);
512 /* Return the tree node and offset if a given argument corresponds to
513 a string constant. */
514 extern tree
string_constant (tree
, tree
*);
516 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
517 extern void jumpifnot (tree
, rtx
);
519 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
520 extern void jumpif (tree
, rtx
);
522 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
523 the result is zero, or IF_TRUE_LABEL if the result is one. */
524 extern void do_jump (tree
, rtx
, rtx
);
526 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
527 extern rtx
compare_from_rtx (rtx
, rtx
, enum rtx_code
, int, enum machine_mode
,
529 extern void do_compare_rtx_and_jump (rtx
, rtx
, enum rtx_code
, int,
530 enum machine_mode
, rtx
, rtx
, rtx
);
532 /* Two different ways of generating switch statements. */
533 extern int try_casesi (tree
, tree
, tree
, tree
, rtx
, rtx
);
534 extern int try_tablejump (tree
, tree
, tree
, tree
, rtx
, rtx
);
536 /* Smallest number of adjacent cases before we use a jump table.
537 XXX Should be a target hook. */
538 extern unsigned int case_values_threshold (void);
540 /* Functions from alias.c */
542 /* extern HOST_WIDE_INT get_varargs_alias_set (void); */
543 /* extern HOST_WIDE_INT get_frame_alias_set (void); */
544 /* extern void record_base_value (unsigned int, rtx, int); */
545 /* extern void record_alias_subset (HOST_WIDE_INT, HOST_WIDE_INT); */
546 /* extern HOST_WIDE_INT new_alias_set (void); */
547 /* extern int can_address_p (tree); */
550 /* rtl.h and tree.h were included. */
551 /* Return an rtx for the size in bytes of the value of an expr. */
552 extern rtx
expr_size (tree
);
554 /* Return a wide integer for the size in bytes of the value of EXP, or -1
555 if the size can vary or is larger than an integer. */
556 extern HOST_WIDE_INT
int_expr_size (tree
);
558 /* Return the address of the trampoline for entering nested fn FUNCTION. */
559 extern rtx
trampoline_address (tree
);
561 /* Return an rtx that refers to the value returned by a function
562 in its original home. This becomes invalid if any more code is emitted. */
563 extern rtx
hard_function_value (tree
, tree
, int);
565 extern rtx
prepare_call_address (rtx
, rtx
, rtx
*, int, int);
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 pretent `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 /* Given REF, a MEM, and T, either the type of X or the expression
651 corresponding to REF, set the memory attributes. OBJECTP is nonzero
652 if we are making a new object of this type. */
653 extern void set_mem_attributes (rtx
, tree
, int);
655 /* Similar, except that BITPOS has not yet been applied to REF, so if
656 we alter MEM_OFFSET according to T then we should subtract BITPOS
657 expecting that it'll be added back in later. */
658 extern void set_mem_attributes_minus_bitpos (rtx
, tree
, int, HOST_WIDE_INT
);
660 /* Assemble the static constant template for function entry trampolines. */
661 extern rtx
assemble_trampoline_template (void);
663 /* Given rtx, return new rtx whose address won't be affected by
664 any side effects. It has been copied to a new temporary reg. */
665 extern rtx
stabilize (rtx
);
667 /* Given an rtx, copy all regs it refers to into new temps
668 and return a modified copy that refers to the new temps. */
669 extern rtx
copy_all_regs (rtx
);
671 /* Copy given rtx to a new temp reg and return that. */
672 extern rtx
copy_to_reg (rtx
);
674 /* Like copy_to_reg but always make the reg Pmode. */
675 extern rtx
copy_addr_to_reg (rtx
);
677 /* Like copy_to_reg but always make the reg the specified mode MODE. */
678 extern rtx
copy_to_mode_reg (enum machine_mode
, rtx
);
680 /* Copy given rtx to given temp reg and return that. */
681 extern rtx
copy_to_suggested_reg (rtx
, rtx
, enum machine_mode
);
683 /* Copy a value to a register if it isn't already a register.
684 Args are mode (in case value is a constant) and the value. */
685 extern rtx
force_reg (enum machine_mode
, rtx
);
687 /* Return given rtx, copied into a new temp reg if it was in memory. */
688 extern rtx
force_not_mem (rtx
);
690 /* Return mode and signedness to use when object is promoted. */
691 extern enum machine_mode
promote_mode (tree
, enum machine_mode
, int *, int);
693 /* Remove some bytes from the stack. An rtx says how many. */
694 extern void adjust_stack (rtx
);
696 /* Add some bytes to the stack. An rtx says how many. */
697 extern void anti_adjust_stack (rtx
);
699 /* This enum is used for the following two functions. */
700 enum save_level
{SAVE_BLOCK
, SAVE_FUNCTION
, SAVE_NONLOCAL
};
702 /* Save the stack pointer at the specified level. */
703 extern void emit_stack_save (enum save_level
, rtx
*, rtx
);
705 /* Restore the stack pointer from a save area of the specified level. */
706 extern void emit_stack_restore (enum save_level
, rtx
, rtx
);
708 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */
709 extern void update_nonlocal_goto_save_area (void);
711 /* Allocate some space on the stack dynamically and return its address. An rtx
712 says how many bytes. */
713 extern rtx
allocate_dynamic_stack_space (rtx
, rtx
, int);
715 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
716 FIRST is a constant and size is a Pmode RTX. These are offsets from the
717 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
718 subtract from the stack. If SIZE is constant, this is done
719 with a fixed number of probes. Otherwise, we must make a loop. */
720 extern void probe_stack_range (HOST_WIDE_INT
, rtx
);
722 /* Return an rtx that refers to the value returned by a library call
723 in its original home. This becomes invalid if any more code is emitted. */
724 extern rtx
hard_libcall_value (enum machine_mode
);
726 /* Given an rtx, return an rtx for a value rounded up to a multiple
727 of STACK_BOUNDARY / BITS_PER_UNIT. */
728 extern rtx
round_push (rtx
);
730 /* Return the mode desired by operand N of a particular bitfield
731 insert/extract insn, or MAX_MACHINE_MODE if no such insn is
734 enum extraction_pattern
{ EP_insv
, EP_extv
, EP_extzv
};
735 extern enum machine_mode
736 mode_for_extraction (enum extraction_pattern
, int);
738 extern rtx
store_bit_field (rtx
, unsigned HOST_WIDE_INT
,
739 unsigned HOST_WIDE_INT
, enum machine_mode
, rtx
);
740 extern rtx
extract_bit_field (rtx
, unsigned HOST_WIDE_INT
,
741 unsigned HOST_WIDE_INT
, int, rtx
,
742 enum machine_mode
, enum machine_mode
);
743 extern rtx
expand_mult (enum machine_mode
, rtx
, rtx
, rtx
, int);
744 extern bool const_mult_add_overflow_p (rtx
, rtx
, rtx
, enum machine_mode
, int);
745 extern rtx
expand_mult_add (rtx
, rtx
, rtx
, rtx
,enum machine_mode
, int);
746 extern rtx
expand_mult_highpart_adjust (enum machine_mode
, rtx
, rtx
, rtx
, rtx
, int);
748 extern rtx
assemble_static_space (unsigned HOST_WIDE_INT
);
749 extern int safe_from_p (rtx
, tree
, int);
751 /* Call this once to initialize the contents of the optabs
752 appropriately for the current target machine. */
753 extern void init_optabs (void);
754 extern void init_all_optabs (void);
756 /* Call this to initialize an optab function entry. */
757 extern rtx
init_one_libfunc (const char *);
759 extern void do_jump_by_parts_equality_rtx (rtx
, rtx
, rtx
);
760 extern void do_jump_by_parts_greater_rtx (enum machine_mode
, int, rtx
, rtx
,
763 extern int vector_mode_valid_p (enum machine_mode
);
765 #endif /* GCC_EXPR_H */