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.
5
6 This file is part of GCC.
7
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
11 version.
12
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
16 for more details.
17
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
21 02110-1301, USA. */
22
23 #ifndef GCC_EXPR_H
24 #define GCC_EXPR_H
25
26 /* For inhibit_defer_pop */
27 #include "function.h"
28 /* For XEXP, GEN_INT, rtx_code */
29 #include "rtl.h"
30 /* For optimize_size */
31 #include "flags.h"
32 /* For host_integerp, tree_low_cst, fold_convert, size_binop, ssize_int,
33 TREE_CODE, TYPE_SIZE, int_size_in_bytes, */
34 #include "tree.h"
35 /* For GET_MODE_BITSIZE, word_mode */
36 #include "machmode.h"
37
38 /* The default branch cost is 1. */
39 #ifndef BRANCH_COST
40 #define BRANCH_COST 1
41 #endif
42
43 /* This is the 4th arg to `expand_expr'.
44 EXPAND_STACK_PARM means we are possibly expanding a call param onto
45 the stack.
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,
55 EXPAND_MEMORY};
56
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)
60
61 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for
62 more information. */
63 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
64
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. */
67
68 #ifndef MOVE_RATIO
69 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
70 #define MOVE_RATIO 2
71 #else
72 /* If we are optimizing for space (-Os), cut down the default move ratio. */
73 #define MOVE_RATIO (optimize_size ? 3 : 15)
74 #endif
75 #endif
76
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. */
79
80 #ifndef CLEAR_RATIO
81 #if defined (HAVE_setmemqi) || defined (HAVE_setmemhi) || defined (HAVE_setmemsi) || defined (HAVE_setmemdi) || defined (HAVE_setmemti)
82 #define CLEAR_RATIO 2
83 #else
84 /* If we are optimizing for space, cut down the default clear ratio. */
85 #define CLEAR_RATIO (optimize_size ? 3 : 15)
86 #endif
87 #endif
88
89 enum direction {none, upward, downward};
90
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. */
95
96 struct args_size
97 {
98 HOST_WIDE_INT constant;
99 tree var;
100 };
101
102 /* Package up various arg related fields of struct args for
103 locate_and_pad_parm. */
104 struct locate_and_pad_arg_data
105 {
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;
122 };
123
124 /* Add the value of the tree INC to the `struct args_size' TO. */
125
126 #define ADD_PARM_SIZE(TO, INC) \
127 do { \
128 tree inc = (INC); \
129 if (host_integerp (inc, 0)) \
130 (TO).constant += tree_low_cst (inc, 0); \
131 else if ((TO).var == 0) \
132 (TO).var = fold_convert (ssizetype, inc); \
133 else \
134 (TO).var = size_binop (PLUS_EXPR, (TO).var, \
135 fold_convert (ssizetype, inc)); \
136 } while (0)
137
138 #define SUB_PARM_SIZE(TO, DEC) \
139 do { \
140 tree dec = (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 fold_convert (ssizetype, dec)); \
146 else \
147 (TO).var = size_binop (MINUS_EXPR, (TO).var, \
148 fold_convert (ssizetype, dec)); \
149 } while (0)
150
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, fold_convert (ssizetype, (SIZE).var), \
156 ssize_int ((SIZE).constant)))
157
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)))
162
163 /* Supply a default definition for FUNCTION_ARG_PADDING:
164 usually pad upward, but pad short args downward on
165 big-endian machines. */
166
167 #define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE) \
168 (! BYTES_BIG_ENDIAN \
169 ? upward \
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))
175
176 #ifndef FUNCTION_ARG_PADDING
177 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
178 DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE))
179 #endif
180
181 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
182 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
183 alignment. */
184
185 #ifndef FUNCTION_ARG_BOUNDARY
186 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
187 #endif
188
189 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
190 Normally move_insn, so Pmode stack pointer. */
191
192 #ifndef STACK_SAVEAREA_MODE
193 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
194 #endif
195
196 /* Supply a default definition of STACK_SIZE_MODE for
197 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
198
199 #ifndef STACK_SIZE_MODE
200 #define STACK_SIZE_MODE word_mode
201 #endif
202
203 /* Provide default values for the macros controlling stack checking. */
204
205 #ifndef STACK_CHECK_BUILTIN
206 #define STACK_CHECK_BUILTIN 0
207 #endif
208
209 /* The default interval is one page. */
210 #ifndef STACK_CHECK_PROBE_INTERVAL
211 #define STACK_CHECK_PROBE_INTERVAL 4096
212 #endif
213
214 /* The default is to do a store into the stack. */
215 #ifndef STACK_CHECK_PROBE_LOAD
216 #define STACK_CHECK_PROBE_LOAD 0
217 #endif
218
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)
222 #endif
223
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)
229 #endif
230
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)
234 #endif
235
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)
241 #endif
242
243 /* Functions from optabs.c, commonly used, and without need for the optabs
244 tables: */
245
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. */
252
253 enum optab_methods
254 {
255 OPTAB_DIRECT,
256 OPTAB_LIB,
257 OPTAB_WIDEN,
258 OPTAB_LIB_WIDEN,
259 OPTAB_MUST_WIDEN
260 };
261
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,
268 int);
269
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);
273
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);
276
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);
287
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);
292
293 /* Generate code to indirectly jump to a location given in the rtx LOC. */
294 extern void emit_indirect_jump (rtx);
295
296 /* Generate a conditional trap instruction. */
297 extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
298
299 #include "insn-config.h"
300
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);
305
306 /* Return nonzero if the conditional move is supported. */
307 int can_conditionally_move_p (enum machine_mode mode);
308
309 #endif
310 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
311 rtx, rtx, enum machine_mode, int);
312
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);
318
319 /* Functions from expmed.c: */
320
321 /* Arguments MODE, RTX: return an rtx for the negation of that value.
322 May emit insns. */
323 extern rtx negate_rtx (enum machine_mode, rtx);
324
325 /* Expand a logical AND operation. */
326 extern rtx expand_and (enum machine_mode, rtx, rtx, rtx);
327
328 /* Emit a store-flag operation. */
329 extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
330 int, int);
331
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);
335
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 rtx expand_builtin_saveregs (void);
344 extern void expand_builtin_trap (void);
345
346 /* Functions from expr.c: */
347
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);
351
352 /* This is run at the start of compiling a function. */
353 extern void init_expr (void);
354
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);
358
359 /* Convert an rtx to specified machine mode and return the result. */
360 extern rtx convert_to_mode (enum machine_mode, rtx, int);
361
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);
364
365 /* Emit code to move a block Y to a block X. */
366
367 enum block_op_methods
368 {
369 BLOCK_OP_NORMAL,
370 BLOCK_OP_NO_LIBCALL,
371 BLOCK_OP_CALL_PARM,
372 /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */
373 BLOCK_OP_TAILCALL
374 };
375
376 extern void init_block_move_fn (const char *);
377 extern void init_block_clear_fn (const char *);
378
379 extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods);
380
381 /* Copy all or part of a value X into registers starting at REGNO.
382 The number of registers to be filled is NREGS. */
383 extern void move_block_to_reg (int, rtx, int, enum machine_mode);
384
385 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
386 The number of registers to be filled is NREGS. */
387 extern void move_block_from_reg (int, rtx, int);
388
389 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
390 extern rtx gen_group_rtx (rtx);
391
392 /* Load a BLKmode value into non-consecutive registers represented by a
393 PARALLEL. */
394 extern void emit_group_load (rtx, rtx, tree, int);
395
396 /* Similarly, but load into new temporaries. */
397 extern rtx emit_group_load_into_temps (rtx, rtx, tree, int);
398
399 /* Move a non-consecutive group of registers represented by a PARALLEL into
400 a non-consecutive group of registers represented by a PARALLEL. */
401 extern void emit_group_move (rtx, rtx);
402
403 /* Move a group of registers represented by a PARALLEL into pseudos. */
404 extern rtx emit_group_move_into_temps (rtx);
405
406 /* Store a BLKmode value from non-consecutive registers represented by a
407 PARALLEL. */
408 extern void emit_group_store (rtx, rtx, tree, int);
409
410 /* Copy BLKmode object from a set of registers. */
411 extern rtx copy_blkmode_from_reg (rtx, rtx, tree);
412
413 /* Mark REG as holding a parameter for the next CALL_INSN. */
414 extern void use_reg (rtx *, rtx);
415
416 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
417 for the next CALL_INSN. */
418 extern void use_regs (rtx *, int, int);
419
420 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
421 extern void use_group_regs (rtx *, rtx);
422
423 /* Write zeros through the storage of OBJECT.
424 If OBJECT has BLKmode, SIZE is its length in bytes. */
425 extern rtx clear_storage (rtx, rtx, enum block_op_methods);
426
427 /* Expand a setmem pattern; return true if successful. */
428 extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int);
429
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
432 succeed. */
433 extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
434
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,
442 enum machine_mode),
443 void *, unsigned int);
444
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.
449 Returns TO + LEN. */
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);
453
454 /* Emit insns to set X from Y. */
455 extern rtx emit_move_insn (rtx, rtx);
456
457 /* Emit insns to set X from Y, with no frills. */
458 extern rtx emit_move_insn_1 (rtx, rtx);
459
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);
463
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);
467
468 /* Expand an assignment that stores the value of FROM into TO. */
469 extern void expand_assignment (tree, tree);
470
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);
476
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);
481
482 /* Work horse for expand_expr. */
483 extern rtx expand_expr_real (tree, rtx, enum machine_mode,
484 enum expand_modifier, rtx *);
485
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. */
489 static inline rtx
expand_expr(tree exp,rtx target,enum machine_mode mode,enum expand_modifier modifier)490 expand_expr (tree exp, rtx target, enum machine_mode mode,
491 enum expand_modifier modifier)
492 {
493 return expand_expr_real (exp, target, mode, modifier, NULL);
494 }
495
496 static inline rtx
expand_normal(tree exp)497 expand_normal (tree exp)
498 {
499 return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL);
500 }
501
502 extern void expand_var (tree);
503
504 /* At the start of a function, record that we have no previously-pushed
505 arguments waiting to be popped. */
506 extern void init_pending_stack_adjust (void);
507
508 /* Discard any pending stack adjustment. */
509 extern void discard_pending_stack_adjust (void);
510
511 /* When exiting from function, if safe, clear out any pending stack adjust
512 so the adjustment won't get done. */
513 extern void clear_pending_stack_adjust (void);
514
515 /* Pop any previously-pushed arguments that have not been popped yet. */
516 extern void do_pending_stack_adjust (void);
517
518 /* Return the tree node and offset if a given argument corresponds to
519 a string constant. */
520 extern tree string_constant (tree, tree *);
521
522 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
523 extern void jumpifnot (tree, rtx);
524
525 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
526 extern void jumpif (tree, rtx);
527
528 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
529 the result is zero, or IF_TRUE_LABEL if the result is one. */
530 extern void do_jump (tree, rtx, rtx);
531
532 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
533 extern rtx compare_from_rtx (rtx, rtx, enum rtx_code, int, enum machine_mode,
534 rtx);
535 extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int,
536 enum machine_mode, rtx, rtx, rtx);
537
538 /* Two different ways of generating switch statements. */
539 extern int try_casesi (tree, tree, tree, tree, rtx, rtx);
540 extern int try_tablejump (tree, tree, tree, tree, rtx, rtx);
541
542 /* Smallest number of adjacent cases before we use a jump table.
543 XXX Should be a target hook. */
544 extern unsigned int case_values_threshold (void);
545
546 /* Functions from alias.c */
547 #include "alias.h"
548
549
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);
553
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);
557
558 /* Return an rtx that refers to the value returned by a function
559 in its original home. This becomes invalid if any more code is emitted. */
560 extern rtx hard_function_value (tree, tree, tree, int);
561
562 extern rtx prepare_call_address (rtx, rtx, rtx *, int, int);
563
564 extern bool shift_return_value (enum machine_mode, bool, rtx);
565
566 extern rtx expand_call (tree, rtx, int);
567
568 extern void fixup_tail_calls (void);
569
570 #ifdef TREE_CODE
571 extern rtx expand_shift (enum tree_code, enum machine_mode, rtx, tree, rtx,
572 int);
573 extern rtx expand_divmod (int, enum tree_code, enum machine_mode, rtx, rtx,
574 rtx, int);
575 #endif
576
577 extern void locate_and_pad_parm (enum machine_mode, tree, int, int, tree,
578 struct args_size *,
579 struct locate_and_pad_arg_data *);
580
581 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
582 extern rtx label_rtx (tree);
583
584 /* As label_rtx, but additionally the label is placed on the forced label
585 list of its containing function (i.e. it is treated as reachable even
586 if how is not obvious). */
587 extern rtx force_label_rtx (tree);
588
589 /* Indicate how an input argument register was promoted. */
590 extern rtx promoted_input_arg (unsigned int, enum machine_mode *, int *);
591
592 /* Return an rtx like arg but sans any constant terms.
593 Returns the original rtx if it has no constant terms.
594 The constant terms are added and stored via a second arg. */
595 extern rtx eliminate_constant_term (rtx, rtx *);
596
597 /* Convert arg to a valid memory address for specified machine mode,
598 by emitting insns to perform arithmetic if nec. */
599 extern rtx memory_address (enum machine_mode, rtx);
600
601 /* Like `memory_address' but pretend `flag_force_addr' is 0. */
602 extern rtx memory_address_noforce (enum machine_mode, rtx);
603
604 /* Return a memory reference like MEMREF, but with its mode changed
605 to MODE and its address changed to ADDR.
606 (VOIDmode means don't change the mode.
607 NULL for ADDR means don't change the address.) */
608 extern rtx change_address (rtx, enum machine_mode, rtx);
609
610 /* Return a memory reference like MEMREF, but with its mode changed
611 to MODE and its address offset by OFFSET bytes. */
612 #define adjust_address(MEMREF, MODE, OFFSET) \
613 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
614
615 /* Likewise, but the reference is not required to be valid. */
616 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
617 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
618
619 /* Return a memory reference like MEMREF, but with its mode changed
620 to MODE and its address changed to ADDR, which is assumed to be
621 increased by OFFSET bytes from MEMREF. */
622 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
623 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
624
625 /* Likewise, but the reference is not required to be valid. */
626 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
627 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
628
629 extern rtx adjust_address_1 (rtx, enum machine_mode, HOST_WIDE_INT, int, int);
630 extern rtx adjust_automodify_address_1 (rtx, enum machine_mode, rtx,
631 HOST_WIDE_INT, int);
632
633 /* Return a memory reference like MEMREF, but whose address is changed by
634 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
635 known to be in OFFSET (possibly 1). */
636 extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT);
637
638 /* Definitions from emit-rtl.c */
639 #include "emit-rtl.h"
640
641 /* Return a memory reference like MEMREF, but with its mode widened to
642 MODE and adjusted by OFFSET. */
643 extern rtx widen_memory_access (rtx, enum machine_mode, HOST_WIDE_INT);
644
645 /* Return a memory reference like MEMREF, but which is known to have a
646 valid address. */
647 extern rtx validize_mem (rtx);
648
649 extern rtx use_anchored_address (rtx);
650
651 /* Given REF, a MEM, and T, either the type of X or the expression
652 corresponding to REF, set the memory attributes. OBJECTP is nonzero
653 if we are making a new object of this type. */
654 extern void set_mem_attributes (rtx, tree, int);
655
656 /* Similar, except that BITPOS has not yet been applied to REF, so if
657 we alter MEM_OFFSET according to T then we should subtract BITPOS
658 expecting that it'll be added back in later. */
659 extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT);
660
661 /* Assemble the static constant template for function entry trampolines. */
662 extern rtx assemble_trampoline_template (void);
663
664 /* Copy given rtx to a new temp reg and return that. */
665 extern rtx copy_to_reg (rtx);
666
667 /* Like copy_to_reg but always make the reg Pmode. */
668 extern rtx copy_addr_to_reg (rtx);
669
670 /* Like copy_to_reg but always make the reg the specified mode MODE. */
671 extern rtx copy_to_mode_reg (enum machine_mode, rtx);
672
673 /* Copy given rtx to given temp reg and return that. */
674 extern rtx copy_to_suggested_reg (rtx, rtx, enum machine_mode);
675
676 /* Copy a value to a register if it isn't already a register.
677 Args are mode (in case value is a constant) and the value. */
678 extern rtx force_reg (enum machine_mode, rtx);
679
680 /* Return given rtx, copied into a new temp reg if it was in memory. */
681 extern rtx force_not_mem (rtx);
682
683 /* Return mode and signedness to use when object is promoted. */
684 extern enum machine_mode promote_mode (tree, enum machine_mode, int *, int);
685
686 /* Remove some bytes from the stack. An rtx says how many. */
687 extern void adjust_stack (rtx);
688
689 /* Add some bytes to the stack. An rtx says how many. */
690 extern void anti_adjust_stack (rtx);
691
692 /* This enum is used for the following two functions. */
693 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
694
695 /* Save the stack pointer at the specified level. */
696 extern void emit_stack_save (enum save_level, rtx *, rtx);
697
698 /* Restore the stack pointer from a save area of the specified level. */
699 extern void emit_stack_restore (enum save_level, rtx, rtx);
700
701 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */
702 extern void update_nonlocal_goto_save_area (void);
703
704 /* Allocate some space on the stack dynamically and return its address. An rtx
705 says how many bytes. */
706 extern rtx allocate_dynamic_stack_space (rtx, rtx, int);
707
708 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
709 FIRST is a constant and size is a Pmode RTX. These are offsets from the
710 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
711 subtract from the stack. If SIZE is constant, this is done
712 with a fixed number of probes. Otherwise, we must make a loop. */
713 extern void probe_stack_range (HOST_WIDE_INT, rtx);
714
715 /* Return an rtx that refers to the value returned by a library call
716 in its original home. This becomes invalid if any more code is emitted. */
717 extern rtx hard_libcall_value (enum machine_mode);
718
719 /* Return the mode desired by operand N of a particular bitfield
720 insert/extract insn, or MAX_MACHINE_MODE if no such insn is
721 available. */
722
723 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
724 extern enum machine_mode
725 mode_for_extraction (enum extraction_pattern, int);
726
727 extern rtx store_bit_field (rtx, unsigned HOST_WIDE_INT,
728 unsigned HOST_WIDE_INT, enum machine_mode, rtx);
729 extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT,
730 unsigned HOST_WIDE_INT, int, rtx,
731 enum machine_mode, enum machine_mode);
732 extern rtx expand_mult (enum machine_mode, rtx, rtx, rtx, int);
733 extern rtx expand_mult_highpart_adjust (enum machine_mode, rtx, rtx, rtx, rtx, int);
734
735 extern rtx assemble_static_space (unsigned HOST_WIDE_INT);
736 extern int safe_from_p (rtx, tree, int);
737
738 /* Call this once to initialize the contents of the optabs
739 appropriately for the current target machine. */
740 extern void init_optabs (void);
741 extern void init_all_optabs (void);
742
743 /* Call this to initialize an optab function entry. */
744 extern rtx init_one_libfunc (const char *);
745
746 extern int vector_mode_valid_p (enum machine_mode);
747
748 #endif /* GCC_EXPR_H */
749