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
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. */
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)
71 /* If we are optimizing for space (-Os), cut down the default move ratio. */
72 #define MOVE_RATIO (optimize_size ? 3 : 15)
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)
83 /* If we are optimizing for space, cut down the default clear ratio. */
84 #define CLEAR_RATIO (optimize_size ? 3 : 15)
88 enum direction
{none
, upward
, downward
};
90 /* Structure to record the size of a sequence of arguments
91 as the sum of a tree-expression and a constant. This structure is
92 also used to store offsets from the stack, which might be negative,
93 so the variable part must be ssizetype, not sizetype. */
97 HOST_WIDE_INT constant
;
101 /* Package up various arg related fields of struct args for
102 locate_and_pad_parm. */
103 struct locate_and_pad_arg_data
105 /* Size of this argument on the stack, rounded up for any padding it
106 gets. If REG_PARM_STACK_SPACE is defined, then register parms are
107 counted here, otherwise they aren't. */
108 struct args_size size
;
109 /* Offset of this argument from beginning of stack-args. */
110 struct args_size offset
;
111 /* Offset to the start of the stack slot. Different from OFFSET
112 if this arg pads downward. */
113 struct args_size slot_offset
;
114 /* The amount that the stack pointer needs to be adjusted to
115 force alignment for the next argument. */
116 struct args_size alignment_pad
;
117 /* Which way we should pad this arg. */
118 enum direction where_pad
;
119 /* slot_offset is at least this aligned. */
120 unsigned int boundary
;
123 /* Add the value of the tree INC to the `struct args_size' TO. */
125 #define ADD_PARM_SIZE(TO, INC) \
128 if (host_integerp (inc, 0)) \
129 (TO).constant += tree_low_cst (inc, 0); \
130 else if ((TO).var == 0) \
131 (TO).var = fold_convert (ssizetype, inc); \
133 (TO).var = size_binop (PLUS_EXPR, (TO).var, \
134 fold_convert (ssizetype, inc)); \
137 #define SUB_PARM_SIZE(TO, DEC) \
140 if (host_integerp (dec, 0)) \
141 (TO).constant -= tree_low_cst (dec, 0); \
142 else if ((TO).var == 0) \
143 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \
144 fold_convert (ssizetype, dec)); \
146 (TO).var = size_binop (MINUS_EXPR, (TO).var, \
147 fold_convert (ssizetype, dec)); \
150 /* Convert the implicit sum in a `struct args_size' into a tree
151 of type ssizetype. */
152 #define ARGS_SIZE_TREE(SIZE) \
153 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \
154 : size_binop (PLUS_EXPR, fold_convert (ssizetype, (SIZE).var), \
155 ssize_int ((SIZE).constant)))
157 /* Convert the implicit sum in a `struct args_size' into an rtx. */
158 #define ARGS_SIZE_RTX(SIZE) \
159 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
160 : expand_normal (ARGS_SIZE_TREE (SIZE)))
162 /* Supply a default definition for FUNCTION_ARG_PADDING:
163 usually pad upward, but pad short args downward on
164 big-endian machines. */
166 #define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE) \
167 (! BYTES_BIG_ENDIAN \
169 : (((MODE) == BLKmode \
170 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
171 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
172 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
173 ? downward : upward))
175 #ifndef FUNCTION_ARG_PADDING
176 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
177 DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE))
180 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
181 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
184 #ifndef FUNCTION_ARG_BOUNDARY
185 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
188 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
189 Normally move_insn, so Pmode stack pointer. */
191 #ifndef STACK_SAVEAREA_MODE
192 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
195 /* Supply a default definition of STACK_SIZE_MODE for
196 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
198 #ifndef STACK_SIZE_MODE
199 #define STACK_SIZE_MODE word_mode
202 /* Provide default values for the macros controlling stack checking. */
204 #ifndef STACK_CHECK_BUILTIN
205 #define STACK_CHECK_BUILTIN 0
208 /* The default interval is one page. */
209 #ifndef STACK_CHECK_PROBE_INTERVAL
210 #define STACK_CHECK_PROBE_INTERVAL 4096
213 /* The default is to do a store into the stack. */
214 #ifndef STACK_CHECK_PROBE_LOAD
215 #define STACK_CHECK_PROBE_LOAD 0
218 /* This value is arbitrary, but should be sufficient for most machines. */
219 #ifndef STACK_CHECK_PROTECT
220 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
223 /* Make the maximum frame size be the largest we can and still only need
224 one probe per function. */
225 #ifndef STACK_CHECK_MAX_FRAME_SIZE
226 #define STACK_CHECK_MAX_FRAME_SIZE \
227 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
230 /* This is arbitrary, but should be large enough everywhere. */
231 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
232 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
235 /* Provide a reasonable default for the maximum size of an object to
236 allocate in the fixed frame. We may need to be able to make this
237 controllable by the user at some point. */
238 #ifndef STACK_CHECK_MAX_VAR_SIZE
239 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
242 /* Functions from optabs.c, commonly used, and without need for the optabs
245 /* Passed to expand_simple_binop and expand_binop to say which options
246 to try to use if the requested operation can't be open-coded on the
247 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
248 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
249 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
250 try anything else. */
261 /* Generate code for a simple binary or unary operation. "Simple" in
262 this case means "can be unambiguously described by a (mode, code)
263 pair and mapped to a single optab." */
264 extern rtx
expand_simple_binop (enum machine_mode
, enum rtx_code
, rtx
,
265 rtx
, rtx
, int, enum optab_methods
);
266 extern rtx
expand_simple_unop (enum machine_mode
, enum rtx_code
, rtx
, rtx
,
269 /* Report whether the machine description contains an insn which can
270 perform the operation described by CODE and MODE. */
271 extern int have_insn_for (enum rtx_code
, enum machine_mode
);
273 /* Emit code to make a call to a constant function or a library call. */
274 extern void emit_libcall_block (rtx
, rtx
, rtx
, rtx
);
276 /* Create but don't emit one rtl instruction to perform certain operations.
277 Modes must match; operands must meet the operation's predicates.
278 Likewise for subtraction and for just copying. */
279 extern rtx
gen_add2_insn (rtx
, rtx
);
280 extern rtx
gen_add3_insn (rtx
, rtx
, rtx
);
281 extern rtx
gen_sub2_insn (rtx
, rtx
);
282 extern rtx
gen_sub3_insn (rtx
, rtx
, rtx
);
283 extern rtx
gen_move_insn (rtx
, rtx
);
284 extern int have_add2_insn (rtx
, rtx
);
285 extern int have_sub2_insn (rtx
, rtx
);
287 /* Emit a pair of rtl insns to compare two rtx's and to jump
288 to a label if the comparison is true. */
289 extern void emit_cmp_and_jump_insns (rtx
, rtx
, enum rtx_code
, rtx
,
290 enum machine_mode
, int, rtx
);
292 /* Generate code to indirectly jump to a location given in the rtx LOC. */
293 extern void emit_indirect_jump (rtx
);
295 /* Generate a conditional trap instruction. */
296 extern rtx
gen_cond_trap (enum rtx_code
, rtx
, rtx
, rtx
);
298 #include "insn-config.h"
300 #ifdef HAVE_conditional_move
301 /* Emit a conditional move operation. */
302 rtx
emit_conditional_move (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
303 rtx
, rtx
, enum machine_mode
, int);
305 /* Return nonzero if the conditional move is supported. */
306 int can_conditionally_move_p (enum machine_mode mode
);
309 rtx
emit_conditional_add (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
310 rtx
, rtx
, enum machine_mode
, int);
312 rtx
expand_val_compare_and_swap (rtx
, rtx
, rtx
, rtx
);
313 rtx
expand_bool_compare_and_swap (rtx
, rtx
, rtx
, rtx
);
314 rtx
expand_sync_operation (rtx
, rtx
, enum rtx_code
);
315 rtx
expand_sync_fetch_operation (rtx
, rtx
, enum rtx_code
, bool, rtx
);
316 rtx
expand_sync_lock_test_and_set (rtx
, rtx
, rtx
);
318 /* Functions from expmed.c: */
320 /* Arguments MODE, RTX: return an rtx for the negation of that value.
322 extern rtx
negate_rtx (enum machine_mode
, rtx
);
324 /* Expand a logical AND operation. */
325 extern rtx
expand_and (enum machine_mode
, rtx
, rtx
, rtx
);
327 /* Emit a store-flag operation. */
328 extern rtx
emit_store_flag (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
331 /* Like emit_store_flag, but always succeeds. */
332 extern rtx
emit_store_flag_force (rtx
, enum rtx_code
, rtx
, rtx
,
333 enum machine_mode
, int, int);
335 /* Functions from builtins.c: */
336 extern rtx
expand_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
337 extern tree
std_build_builtin_va_list (void);
338 extern void std_expand_builtin_va_start (tree
, rtx
);
339 extern rtx
default_expand_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
340 extern void expand_builtin_setjmp_setup (rtx
, rtx
);
341 extern void expand_builtin_setjmp_receiver (rtx
);
342 extern rtx
expand_builtin_saveregs (void);
343 extern void expand_builtin_trap (void);
344 extern rtx
builtin_strncpy_read_str (void *, HOST_WIDE_INT
, enum machine_mode
);
346 /* Functions from expr.c: */
348 /* This is run once per compilation to set up which modes can be used
349 directly in memory and to initialize the block move optab. */
350 extern void init_expr_once (void);
352 /* This is run at the start of compiling a function. */
353 extern void init_expr (void);
355 /* Emit some rtl insns to move data between rtx's, converting machine modes.
356 Both modes must be floating or both fixed. */
357 extern void convert_move (rtx
, rtx
, int);
359 /* Convert an rtx to specified machine mode and return the result. */
360 extern rtx
convert_to_mode (enum machine_mode
, rtx
, int);
362 /* Convert an rtx to MODE from OLDMODE and return the result. */
363 extern rtx
convert_modes (enum machine_mode
, enum machine_mode
, rtx
, int);
365 /* Emit code to move a block Y to a block X. */
367 enum block_op_methods
372 /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */
376 extern void init_block_move_fn (const char *);
377 extern void init_block_clear_fn (const char *);
379 extern rtx
emit_block_move (rtx
, rtx
, rtx
, enum block_op_methods
);
380 extern rtx
emit_block_move_via_libcall (rtx
, rtx
, rtx
, bool);
381 extern rtx
emit_block_move_hints (rtx
, rtx
, rtx
, enum block_op_methods
,
382 unsigned int, HOST_WIDE_INT
);
384 /* Copy all or part of a value X into registers starting at REGNO.
385 The number of registers to be filled is NREGS. */
386 extern void move_block_to_reg (int, rtx
, int, enum machine_mode
);
388 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
389 The number of registers to be filled is NREGS. */
390 extern void move_block_from_reg (int, rtx
, int);
392 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
393 extern rtx
gen_group_rtx (rtx
);
395 /* Load a BLKmode value into non-consecutive registers represented by a
397 extern void emit_group_load (rtx
, rtx
, tree
, int);
399 /* Similarly, but load into new temporaries. */
400 extern rtx
emit_group_load_into_temps (rtx
, rtx
, tree
, int);
402 /* Move a non-consecutive group of registers represented by a PARALLEL into
403 a non-consecutive group of registers represented by a PARALLEL. */
404 extern void emit_group_move (rtx
, rtx
);
406 /* Move a group of registers represented by a PARALLEL into pseudos. */
407 extern rtx
emit_group_move_into_temps (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
, enum block_op_methods
);
429 extern rtx
clear_storage_hints (rtx
, rtx
, enum block_op_methods
,
430 unsigned int, HOST_WIDE_INT
);
431 /* The same, but always output an library call. */
432 rtx
set_storage_via_libcall (rtx
, rtx
, rtx
, bool);
434 /* Expand a setmem pattern; return true if successful. */
435 extern bool set_storage_via_setmem (rtx
, rtx
, rtx
, unsigned int,
436 unsigned int, HOST_WIDE_INT
);
438 /* Determine whether the LEN bytes can be moved by using several move
439 instructions. Return nonzero if a call to move_by_pieces should
441 extern int can_move_by_pieces (unsigned HOST_WIDE_INT
, unsigned int);
443 /* Return nonzero if it is desirable to store LEN bytes generated by
444 CONSTFUN with several move instructions by store_by_pieces
445 function. CONSTFUNDATA is a pointer which will be passed as argument
446 in every CONSTFUN call.
447 ALIGN is maximum alignment we can assume. */
448 extern int can_store_by_pieces (unsigned HOST_WIDE_INT
,
449 rtx (*) (void *, HOST_WIDE_INT
,
451 void *, unsigned int);
453 /* Generate several move instructions to store LEN bytes generated by
454 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
455 pointer which will be passed as argument in every CONSTFUN call.
456 ALIGN is maximum alignment we can assume.
458 extern rtx
store_by_pieces (rtx
, unsigned HOST_WIDE_INT
,
459 rtx (*) (void *, HOST_WIDE_INT
, enum machine_mode
),
460 void *, unsigned int, int);
462 /* Emit insns to set X from Y. */
463 extern rtx
emit_move_insn (rtx
, rtx
);
465 /* Emit insns to set X from Y, with no frills. */
466 extern rtx
emit_move_insn_1 (rtx
, rtx
);
468 extern rtx
emit_move_complex_push (enum machine_mode
, rtx
, rtx
);
469 extern rtx
emit_move_complex_parts (rtx
, rtx
);
471 /* Push a block of length SIZE (perhaps variable)
472 and return an rtx to address the beginning of the block. */
473 extern rtx
push_block (rtx
, int, int);
475 /* Generate code to push something onto the stack, given its mode and type. */
476 extern void emit_push_insn (rtx
, enum machine_mode
, tree
, rtx
, unsigned int,
477 int, rtx
, int, rtx
, rtx
, int, rtx
);
479 /* Expand an assignment that stores the value of FROM into TO. */
480 extern void expand_assignment (tree
, tree
, bool);
482 /* Generate code for computing expression EXP,
483 and storing the value into TARGET.
484 If SUGGEST_REG is nonzero, copy the value through a register
485 and return that register, if that is possible. */
486 extern rtx
store_expr (tree
, rtx
, int, bool);
488 /* Given an rtx that may include add and multiply operations,
489 generate them as insns and return a pseudo-reg containing the value.
490 Useful after calling expand_expr with 1 as sum_ok. */
491 extern rtx
force_operand (rtx
, rtx
);
493 /* Work horse for expand_expr. */
494 extern rtx
expand_expr_real (tree
, rtx
, enum machine_mode
,
495 enum expand_modifier
, rtx
*);
497 /* Generate code for computing expression EXP.
498 An rtx for the computed value is returned. The value is never null.
499 In the case of a void EXP, const0_rtx is returned. */
501 expand_expr (tree exp
, rtx target
, enum machine_mode mode
,
502 enum expand_modifier modifier
)
504 return expand_expr_real (exp
, target
, mode
, modifier
, NULL
);
508 expand_normal (tree exp
)
510 return expand_expr_real (exp
, NULL_RTX
, VOIDmode
, EXPAND_NORMAL
, NULL
);
513 extern void expand_var (tree
);
515 /* At the start of a function, record that we have no previously-pushed
516 arguments waiting to be popped. */
517 extern void init_pending_stack_adjust (void);
519 /* Discard any pending stack adjustment. */
520 extern void discard_pending_stack_adjust (void);
522 /* When exiting from function, if safe, clear out any pending stack adjust
523 so the adjustment won't get done. */
524 extern void clear_pending_stack_adjust (void);
526 /* Pop any previously-pushed arguments that have not been popped yet. */
527 extern void do_pending_stack_adjust (void);
529 /* Return the tree node and offset if a given argument corresponds to
530 a string constant. */
531 extern tree
string_constant (tree
, tree
*);
533 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
534 extern void jumpifnot (tree
, rtx
);
536 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
537 extern void jumpif (tree
, rtx
);
539 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
540 the result is zero, or IF_TRUE_LABEL if the result is one. */
541 extern void do_jump (tree
, rtx
, rtx
);
543 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
544 extern rtx
compare_from_rtx (rtx
, rtx
, enum rtx_code
, int, enum machine_mode
,
546 extern void do_compare_rtx_and_jump (rtx
, rtx
, enum rtx_code
, int,
547 enum machine_mode
, rtx
, rtx
, rtx
);
549 /* Two different ways of generating switch statements. */
550 extern int try_casesi (tree
, tree
, tree
, tree
, rtx
, rtx
);
551 extern int try_tablejump (tree
, tree
, tree
, tree
, rtx
, rtx
);
553 /* Smallest number of adjacent cases before we use a jump table.
554 XXX Should be a target hook. */
555 extern unsigned int case_values_threshold (void);
557 /* Functions from alias.c */
561 /* rtl.h and tree.h were included. */
562 /* Return an rtx for the size in bytes of the value of an expr. */
563 extern rtx
expr_size (tree
);
565 /* Return a wide integer for the size in bytes of the value of EXP, or -1
566 if the size can vary or is larger than an integer. */
567 extern HOST_WIDE_INT
int_expr_size (tree
);
569 /* Return an rtx that refers to the value returned by a function
570 in its original home. This becomes invalid if any more code is emitted. */
571 extern rtx
hard_function_value (const_tree
, const_tree
, const_tree
, int);
573 extern rtx
prepare_call_address (rtx
, rtx
, rtx
*, int, int);
575 extern bool shift_return_value (enum machine_mode
, bool, rtx
);
577 extern rtx
expand_call (tree
, rtx
, int);
579 extern void fixup_tail_calls (void);
582 extern rtx
expand_shift (enum tree_code
, enum machine_mode
, rtx
, tree
, rtx
,
584 extern rtx
expand_divmod (int, enum tree_code
, enum machine_mode
, rtx
, rtx
,
588 extern void locate_and_pad_parm (enum machine_mode
, tree
, int, int, tree
,
590 struct locate_and_pad_arg_data
*);
592 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
593 extern rtx
label_rtx (tree
);
595 /* As label_rtx, but additionally the label is placed on the forced label
596 list of its containing function (i.e. it is treated as reachable even
597 if how is not obvious). */
598 extern rtx
force_label_rtx (tree
);
600 /* Return an rtx like arg but sans any constant terms.
601 Returns the original rtx if it has no constant terms.
602 The constant terms are added and stored via a second arg. */
603 extern rtx
eliminate_constant_term (rtx
, rtx
*);
605 /* Convert arg to a valid memory address for specified machine mode,
606 by emitting insns to perform arithmetic if nec. */
607 extern rtx
memory_address (enum machine_mode
, rtx
);
609 /* Like `memory_address' but pretend `flag_force_addr' is 0. */
610 extern rtx
memory_address_noforce (enum machine_mode
, rtx
);
612 /* Return a memory reference like MEMREF, but with its mode changed
613 to MODE and its address changed to ADDR.
614 (VOIDmode means don't change the mode.
615 NULL for ADDR means don't change the address.) */
616 extern rtx
change_address (rtx
, enum machine_mode
, rtx
);
618 /* Return a memory reference like MEMREF, but with its mode changed
619 to MODE and its address offset by OFFSET bytes. */
620 #define adjust_address(MEMREF, MODE, OFFSET) \
621 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
623 /* Likewise, but the reference is not required to be valid. */
624 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
625 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
627 /* Return a memory reference like MEMREF, but with its mode changed
628 to MODE and its address changed to ADDR, which is assumed to be
629 increased by OFFSET bytes from MEMREF. */
630 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
631 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
633 /* Likewise, but the reference is not required to be valid. */
634 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
635 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
637 extern rtx
adjust_address_1 (rtx
, enum machine_mode
, HOST_WIDE_INT
, int, int);
638 extern rtx
adjust_automodify_address_1 (rtx
, enum machine_mode
, rtx
,
641 /* Return a memory reference like MEMREF, but whose address is changed by
642 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
643 known to be in OFFSET (possibly 1). */
644 extern rtx
offset_address (rtx
, rtx
, unsigned HOST_WIDE_INT
);
646 /* Definitions from emit-rtl.c */
647 #include "emit-rtl.h"
649 /* Return a memory reference like MEMREF, but with its mode widened to
650 MODE and adjusted by OFFSET. */
651 extern rtx
widen_memory_access (rtx
, enum machine_mode
, HOST_WIDE_INT
);
653 /* Return a memory reference like MEMREF, but which is known to have a
655 extern rtx
validize_mem (rtx
);
657 extern rtx
use_anchored_address (rtx
);
659 /* Given REF, a MEM, and T, either the type of X or the expression
660 corresponding to REF, set the memory attributes. OBJECTP is nonzero
661 if we are making a new object of this type. */
662 extern void set_mem_attributes (rtx
, tree
, int);
664 /* Similar, except that BITPOS has not yet been applied to REF, so if
665 we alter MEM_OFFSET according to T then we should subtract BITPOS
666 expecting that it'll be added back in later. */
667 extern void set_mem_attributes_minus_bitpos (rtx
, tree
, int, HOST_WIDE_INT
);
669 /* Assemble the static constant template for function entry trampolines. */
670 extern rtx
assemble_trampoline_template (void);
672 /* Copy given rtx to a new temp reg and return that. */
673 extern rtx
copy_to_reg (rtx
);
675 /* Like copy_to_reg but always make the reg Pmode. */
676 extern rtx
copy_addr_to_reg (rtx
);
678 /* Like copy_to_reg but always make the reg the specified mode MODE. */
679 extern rtx
copy_to_mode_reg (enum machine_mode
, rtx
);
681 /* Copy given rtx to given temp reg and return that. */
682 extern rtx
copy_to_suggested_reg (rtx
, rtx
, enum machine_mode
);
684 /* Copy a value to a register if it isn't already a register.
685 Args are mode (in case value is a constant) and the value. */
686 extern rtx
force_reg (enum machine_mode
, rtx
);
688 /* Return given rtx, copied into a new temp reg if it was in memory. */
689 extern rtx
force_not_mem (rtx
);
691 /* Return mode and signedness to use when object is promoted. */
692 extern enum machine_mode
promote_mode (const_tree
, enum machine_mode
, int *, int);
694 /* Remove some bytes from the stack. An rtx says how many. */
695 extern void adjust_stack (rtx
);
697 /* Add some bytes to the stack. An rtx says how many. */
698 extern void anti_adjust_stack (rtx
);
700 /* This enum is used for the following two functions. */
701 enum save_level
{SAVE_BLOCK
, SAVE_FUNCTION
, SAVE_NONLOCAL
};
703 /* Save the stack pointer at the specified level. */
704 extern void emit_stack_save (enum save_level
, rtx
*, rtx
);
706 /* Restore the stack pointer from a save area of the specified level. */
707 extern void emit_stack_restore (enum save_level
, rtx
, rtx
);
709 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */
710 extern void update_nonlocal_goto_save_area (void);
712 /* Allocate some space on the stack dynamically and return its address. An rtx
713 says how many bytes. */
714 extern rtx
allocate_dynamic_stack_space (rtx
, rtx
, int);
716 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
717 FIRST is a constant and size is a Pmode RTX. These are offsets from the
718 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
719 subtract from the stack. If SIZE is constant, this is done
720 with a fixed number of probes. Otherwise, we must make a loop. */
721 extern void probe_stack_range (HOST_WIDE_INT
, rtx
);
723 /* Return an rtx that refers to the value returned by a library call
724 in its original home. This becomes invalid if any more code is emitted. */
725 extern rtx
hard_libcall_value (enum machine_mode
);
727 /* Return the mode desired by operand N of a particular bitfield
728 insert/extract insn, or MAX_MACHINE_MODE if no such insn is
731 enum extraction_pattern
{ EP_insv
, EP_extv
, EP_extzv
};
732 extern enum machine_mode
733 mode_for_extraction (enum extraction_pattern
, int);
735 extern void store_bit_field (rtx
, unsigned HOST_WIDE_INT
,
736 unsigned HOST_WIDE_INT
, enum machine_mode
, rtx
);
737 extern rtx
extract_bit_field (rtx
, unsigned HOST_WIDE_INT
,
738 unsigned HOST_WIDE_INT
, int, rtx
,
739 enum machine_mode
, enum machine_mode
);
740 extern rtx
expand_mult (enum machine_mode
, rtx
, rtx
, rtx
, int);
741 extern rtx
expand_mult_highpart_adjust (enum machine_mode
, rtx
, rtx
, rtx
, rtx
, int);
743 extern rtx
assemble_static_space (unsigned HOST_WIDE_INT
);
744 extern int safe_from_p (const_rtx
, tree
, int);
746 /* Call this once to initialize the contents of the optabs
747 appropriately for the current target machine. */
748 extern void init_optabs (void);
749 extern void init_all_optabs (void);
751 /* Call this to initialize an optab function entry. */
752 extern rtx
init_one_libfunc (const char *);
754 extern int vector_mode_valid_p (enum machine_mode
);
756 #endif /* GCC_EXPR_H */