sourcebuild.texi: Add libcpp, now that CPP has its own directory.
[official-gcc.git] / gcc / expr.h
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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
10 version.
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
15 for more details.
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
20 02111-1307, USA. */
22 #ifndef GCC_EXPR_H
23 #define GCC_EXPR_H
25 /* For inhibit_defer_pop */
26 #include "function.h"
27 /* For XEXP, GEN_INT, rtx_code */
28 #include "rtl.h"
29 /* For optimize_size */
30 #include "flags.h"
31 /* For host_integerp, tree_low_cst, convert, size_binop, ssize_int, TREE_CODE,
32 TYPE_SIZE, int_size_in_bytes, */
33 #include "tree.h"
34 /* For GET_MODE_BITSIZE, word_mode */
35 #include "machmode.h"
37 /* The default branch cost is 1. */
38 #ifndef BRANCH_COST
39 #define BRANCH_COST 1
40 #endif
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,
55 EXPAND_MEMORY};
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
62 more information. */
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. */
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
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. */
80 #ifndef CLEAR_RATIO
81 #if defined (HAVE_clrmemqi) || defined (HAVE_clrmemhi) || defined (HAVE_clrmemsi) || defined (HAVE_clrmemdi) || defined (HAVE_clrmemti)
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
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. */
96 struct args_size
98 HOST_WIDE_INT constant;
99 tree var;
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) \
125 do { \
126 tree inc = (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); \
131 else \
132 (TO).var = size_binop (PLUS_EXPR, (TO).var, \
133 convert (ssizetype, inc)); \
134 } while (0)
136 #define SUB_PARM_SIZE(TO, DEC) \
137 do { \
138 tree dec = (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)); \
144 else \
145 (TO).var = size_binop (MINUS_EXPR, (TO).var, \
146 convert (ssizetype, dec)); \
147 } while (0)
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 \
167 ? upward \
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))
177 #endif
179 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
180 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
181 alignment. */
183 #ifndef FUNCTION_ARG_BOUNDARY
184 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
185 #endif
187 #ifndef FUNCTION_ARG_PARTIAL_NREGS
188 #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED) 0
189 #endif
191 #ifndef FUNCTION_ARG_CALLEE_COPIES
192 #define FUNCTION_ARG_CALLEE_COPIES(CUM, MODE, TYPE, NAMED) 0
193 #endif
195 tree split_complex_types (tree);
196 tree split_complex_values (tree);
198 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
199 Normally move_insn, so Pmode stack pointer. */
201 #ifndef STACK_SAVEAREA_MODE
202 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
203 #endif
205 /* Supply a default definition of STACK_SIZE_MODE for
206 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
208 #ifndef STACK_SIZE_MODE
209 #define STACK_SIZE_MODE word_mode
210 #endif
212 /* Provide default values for the macros controlling stack checking. */
214 #ifndef STACK_CHECK_BUILTIN
215 #define STACK_CHECK_BUILTIN 0
216 #endif
218 /* The default interval is one page. */
219 #ifndef STACK_CHECK_PROBE_INTERVAL
220 #define STACK_CHECK_PROBE_INTERVAL 4096
221 #endif
223 /* The default is to do a store into the stack. */
224 #ifndef STACK_CHECK_PROBE_LOAD
225 #define STACK_CHECK_PROBE_LOAD 0
226 #endif
228 /* This value is arbitrary, but should be sufficient for most machines. */
229 #ifndef STACK_CHECK_PROTECT
230 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
231 #endif
233 /* Make the maximum frame size be the largest we can and still only need
234 one probe per function. */
235 #ifndef STACK_CHECK_MAX_FRAME_SIZE
236 #define STACK_CHECK_MAX_FRAME_SIZE \
237 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
238 #endif
240 /* This is arbitrary, but should be large enough everywhere. */
241 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
242 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
243 #endif
245 /* Provide a reasonable default for the maximum size of an object to
246 allocate in the fixed frame. We may need to be able to make this
247 controllable by the user at some point. */
248 #ifndef STACK_CHECK_MAX_VAR_SIZE
249 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
250 #endif
252 /* Functions from optabs.c, commonly used, and without need for the optabs
253 tables: */
255 /* Passed to expand_simple_binop and expand_binop to say which options
256 to try to use if the requested operation can't be open-coded on the
257 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
258 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
259 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
260 try anything else. */
262 enum optab_methods
264 OPTAB_DIRECT,
265 OPTAB_LIB,
266 OPTAB_WIDEN,
267 OPTAB_LIB_WIDEN,
268 OPTAB_MUST_WIDEN
271 /* Generate code for a simple binary or unary operation. "Simple" in
272 this case means "can be unambiguously described by a (mode, code)
273 pair and mapped to a single optab." */
274 extern rtx expand_simple_binop (enum machine_mode, enum rtx_code, rtx,
275 rtx, rtx, int, enum optab_methods);
276 extern rtx expand_simple_unop (enum machine_mode, enum rtx_code, rtx, rtx,
277 int);
279 /* Report whether the machine description contains an insn which can
280 perform the operation described by CODE and MODE. */
281 extern int have_insn_for (enum rtx_code, enum machine_mode);
283 /* Emit code to make a call to a constant function or a library call. */
284 extern void emit_libcall_block (rtx, rtx, rtx, rtx);
286 /* Create but don't emit one rtl instruction to perform certain operations.
287 Modes must match; operands must meet the operation's predicates.
288 Likewise for subtraction and for just copying. */
289 extern rtx gen_add2_insn (rtx, rtx);
290 extern rtx gen_add3_insn (rtx, rtx, rtx);
291 extern rtx gen_sub2_insn (rtx, rtx);
292 extern rtx gen_sub3_insn (rtx, rtx, rtx);
293 extern rtx gen_move_insn (rtx, rtx);
294 extern int have_add2_insn (rtx, rtx);
295 extern int have_sub2_insn (rtx, rtx);
297 /* Emit a pair of rtl insns to compare two rtx's and to jump
298 to a label if the comparison is true. */
299 extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx,
300 enum machine_mode, int, rtx);
302 /* Generate code to indirectly jump to a location given in the rtx LOC. */
303 extern void emit_indirect_jump (rtx);
305 #include "insn-config.h"
307 #ifdef HAVE_conditional_move
308 /* Emit a conditional move operation. */
309 rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
310 rtx, rtx, enum machine_mode, int);
312 /* Return nonzero if the conditional move is supported. */
313 int can_conditionally_move_p (enum machine_mode mode);
315 #endif
316 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
317 rtx, rtx, enum machine_mode, int);
320 /* Functions from expmed.c: */
322 /* Arguments MODE, RTX: return an rtx for the negation of that value.
323 May emit insns. */
324 extern rtx negate_rtx (enum machine_mode, rtx);
326 /* Expand a logical AND operation. */
327 extern rtx expand_and (enum machine_mode, rtx, rtx, rtx);
329 /* Emit a store-flag operation. */
330 extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
331 int, int);
333 /* Like emit_store_flag, but always succeeds. */
334 extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx,
335 enum machine_mode, int, int);
337 /* Functions from loop.c: */
339 /* Given an insn and condition, return a canonical description of
340 the test being made. */
341 extern rtx canonicalize_condition (rtx, rtx, int, rtx *, rtx, int);
343 /* Given a JUMP_INSN, return a canonical description of the test
344 being made. */
345 extern rtx get_condition (rtx, rtx *, int);
347 /* Generate a conditional trap instruction. */
348 extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
350 /* Functions from builtins.c: */
351 extern rtx expand_builtin (tree, rtx, rtx, enum machine_mode, int);
352 extern tree std_build_builtin_va_list (void);
353 extern void std_expand_builtin_va_start (tree, rtx);
354 extern rtx default_expand_builtin (tree, rtx, rtx, enum machine_mode, int);
355 extern void expand_builtin_setjmp_setup (rtx, rtx);
356 extern void expand_builtin_setjmp_receiver (rtx);
357 extern void expand_builtin_longjmp (rtx, rtx);
358 extern rtx expand_builtin_saveregs (void);
359 extern void expand_builtin_trap (void);
361 /* Functions from expr.c: */
363 /* This is run once per compilation to set up which modes can be used
364 directly in memory and to initialize the block move optab. */
365 extern void init_expr_once (void);
367 /* This is run at the start of compiling a function. */
368 extern void init_expr (void);
370 /* Emit some rtl insns to move data between rtx's, converting machine modes.
371 Both modes must be floating or both fixed. */
372 extern void convert_move (rtx, rtx, int);
374 /* Convert an rtx to specified machine mode and return the result. */
375 extern rtx convert_to_mode (enum machine_mode, rtx, int);
377 /* Convert an rtx to MODE from OLDMODE and return the result. */
378 extern rtx convert_modes (enum machine_mode, enum machine_mode, rtx, int);
380 /* Emit code to move a block Y to a block X. */
382 enum block_op_methods
384 BLOCK_OP_NORMAL,
385 BLOCK_OP_NO_LIBCALL,
386 BLOCK_OP_CALL_PARM
389 extern void init_block_move_fn (const char *);
390 extern void init_block_clear_fn (const char *);
392 extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods);
394 /* Copy all or part of a value X into registers starting at REGNO.
395 The number of registers to be filled is NREGS. */
396 extern void move_block_to_reg (int, rtx, int, enum machine_mode);
398 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
399 The number of registers to be filled is NREGS. */
400 extern void move_block_from_reg (int, rtx, int);
402 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
403 extern rtx gen_group_rtx (rtx);
405 /* Load a BLKmode value into non-consecutive registers represented by a
406 PARALLEL. */
407 extern void emit_group_load (rtx, rtx, tree, int);
409 /* Move a non-consecutive group of registers represented by a PARALLEL into
410 a non-consecutive group of registers represented by a PARALLEL. */
411 extern void emit_group_move (rtx, rtx);
413 /* Store a BLKmode value from non-consecutive registers represented by a
414 PARALLEL. */
415 extern void emit_group_store (rtx, rtx, tree, int);
417 /* Copy BLKmode object from a set of registers. */
418 extern rtx copy_blkmode_from_reg (rtx, rtx, tree);
420 /* Mark REG as holding a parameter for the next CALL_INSN. */
421 extern void use_reg (rtx *, rtx);
423 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
424 for the next CALL_INSN. */
425 extern void use_regs (rtx *, int, int);
427 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
428 extern void use_group_regs (rtx *, rtx);
430 /* Write zeros through the storage of OBJECT.
431 If OBJECT has BLKmode, SIZE is its length in bytes. */
432 extern rtx clear_storage (rtx, rtx);
434 /* Determine whether the LEN bytes can be moved by using several move
435 instructions. Return nonzero if a call to move_by_pieces should
436 succeed. */
437 extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
439 /* Return nonzero if it is desirable to store LEN bytes generated by
440 CONSTFUN with several move instructions by store_by_pieces
441 function. CONSTFUNDATA is a pointer which will be passed as argument
442 in every CONSTFUN call.
443 ALIGN is maximum alignment we can assume. */
444 extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
445 rtx (*) (void *, HOST_WIDE_INT,
446 enum machine_mode),
447 void *, unsigned int);
449 /* Generate several move instructions to store LEN bytes generated by
450 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
451 pointer which will be passed as argument in every CONSTFUN call.
452 ALIGN is maximum alignment we can assume.
453 Returns TO + LEN. */
454 extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT,
455 rtx (*) (void *, HOST_WIDE_INT, enum machine_mode),
456 void *, unsigned int, int);
458 /* Emit insns to set X from Y. */
459 extern rtx emit_move_insn (rtx, rtx);
461 /* Emit insns to set X from Y, with no frills. */
462 extern rtx emit_move_insn_1 (rtx, rtx);
464 /* Push a block of length SIZE (perhaps variable)
465 and return an rtx to address the beginning of the block. */
466 extern rtx push_block (rtx, int, int);
468 /* Generate code to push something onto the stack, given its mode and type. */
469 extern void emit_push_insn (rtx, enum machine_mode, tree, rtx, unsigned int,
470 int, rtx, int, rtx, rtx, int, rtx);
472 /* Expand an assignment that stores the value of FROM into TO. */
473 extern rtx expand_assignment (tree, tree, int);
475 /* Generate code for computing expression EXP,
476 and storing the value into TARGET.
477 If SUGGEST_REG is nonzero, copy the value through a register
478 and return that register, if that is possible. */
479 extern rtx store_expr (tree, rtx, int);
481 /* Given an rtx that may include add and multiply operations,
482 generate them as insns and return a pseudo-reg containing the value.
483 Useful after calling expand_expr with 1 as sum_ok. */
484 extern rtx force_operand (rtx, rtx);
486 /* Work horse for expand_expr. */
487 extern rtx expand_expr_real (tree, rtx, enum machine_mode,
488 enum expand_modifier, rtx *);
490 /* Generate code for computing expression EXP.
491 An rtx for the computed value is returned. The value is never null.
492 In the case of a void EXP, const0_rtx is returned. */
493 static inline rtx
494 expand_expr (tree exp, rtx target, enum machine_mode mode,
495 enum expand_modifier modifier)
497 return expand_expr_real (exp, target, mode, modifier, NULL);
500 extern void expand_var (tree);
502 /* At the start of a function, record that we have no previously-pushed
503 arguments waiting to be popped. */
504 extern void init_pending_stack_adjust (void);
506 /* When exiting from function, if safe, clear out any pending stack adjust
507 so the adjustment won't get done. */
508 extern void clear_pending_stack_adjust (void);
510 /* Pop any previously-pushed arguments that have not been popped yet. */
511 extern void do_pending_stack_adjust (void);
513 /* Return the tree node and offset if a given argument corresponds to
514 a string constant. */
515 extern tree string_constant (tree, tree *);
517 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
518 extern void jumpifnot (tree, rtx);
520 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
521 extern void jumpif (tree, rtx);
523 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
524 the result is zero, or IF_TRUE_LABEL if the result is one. */
525 extern void do_jump (tree, rtx, rtx);
527 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
528 extern rtx compare_from_rtx (rtx, rtx, enum rtx_code, int, enum machine_mode,
529 rtx);
530 extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int,
531 enum machine_mode, rtx, rtx, rtx);
533 /* Two different ways of generating switch statements. */
534 extern int try_casesi (tree, tree, tree, tree, rtx, rtx);
535 extern int try_tablejump (tree, tree, tree, tree, rtx, rtx);
537 /* Smallest number of adjacent cases before we use a jump table.
538 XXX Should be a target hook. */
539 extern unsigned int case_values_threshold (void);
541 /* Functions from alias.c */
542 #include "alias.h"
543 /* extern HOST_WIDE_INT get_varargs_alias_set (void); */
544 /* extern HOST_WIDE_INT get_frame_alias_set (void); */
545 /* extern void record_base_value (unsigned int, rtx, int); */
546 /* extern void record_alias_subset (HOST_WIDE_INT, HOST_WIDE_INT); */
547 /* extern HOST_WIDE_INT new_alias_set (void); */
548 /* extern int can_address_p (tree); */
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 /* Convert a stack slot address ADDR valid in function FNDECL
560 into an address valid in this function (using a static chain). */
561 extern rtx fix_lexical_addr (rtx, tree);
563 /* Return the address of the trampoline for entering nested fn FUNCTION. */
564 extern rtx trampoline_address (tree);
566 /* Return an rtx that refers to the value returned by a function
567 in its original home. This becomes invalid if any more code is emitted. */
568 extern rtx hard_function_value (tree, tree, int);
570 extern rtx prepare_call_address (rtx, rtx, rtx *, int, int);
572 extern rtx expand_call (tree, rtx, int);
574 extern void fixup_tail_calls (void);
576 #ifdef TREE_CODE
577 extern rtx expand_shift (enum tree_code, enum machine_mode, rtx, tree, rtx,
578 int);
579 extern rtx expand_divmod (int, enum tree_code, enum machine_mode, rtx, rtx,
580 rtx, int);
581 #endif
583 extern void locate_and_pad_parm (enum machine_mode, tree, int, int, tree,
584 struct args_size *,
585 struct locate_and_pad_arg_data *);
587 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
588 extern rtx label_rtx (tree);
590 /* As label_rtx, but additionally the label is placed on the forced label
591 list of its containing function (i.e. it is treated as reachable even
592 if how is not obvious). */
593 extern rtx force_label_rtx (tree);
595 /* Indicate how an input argument register was promoted. */
596 extern rtx promoted_input_arg (unsigned int, enum machine_mode *, int *);
598 /* Return an rtx like arg but sans any constant terms.
599 Returns the original rtx if it has no constant terms.
600 The constant terms are added and stored via a second arg. */
601 extern rtx eliminate_constant_term (rtx, rtx *);
603 /* Convert arg to a valid memory address for specified machine mode,
604 by emitting insns to perform arithmetic if nec. */
605 extern rtx memory_address (enum machine_mode, rtx);
607 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
608 extern rtx memory_address_noforce (enum machine_mode, rtx);
610 /* Return a memory reference like MEMREF, but with its mode changed
611 to MODE and its address changed to ADDR.
612 (VOIDmode means don't change the mode.
613 NULL for ADDR means don't change the address.) */
614 extern rtx change_address (rtx, enum machine_mode, rtx);
616 /* Return a memory reference like MEMREF, but with its mode changed
617 to MODE and its address offset by OFFSET bytes. */
618 #define adjust_address(MEMREF, MODE, OFFSET) \
619 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
621 /* Likewise, but the reference is not required to be valid. */
622 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
623 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
625 /* Return a memory reference like MEMREF, but with its mode changed
626 to MODE and its address changed to ADDR, which is assumed to be
627 increased by OFFSET bytes from MEMREF. */
628 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
629 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
631 /* Likewise, but the reference is not required to be valid. */
632 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
633 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
635 extern rtx adjust_address_1 (rtx, enum machine_mode, HOST_WIDE_INT, int, int);
636 extern rtx adjust_automodify_address_1 (rtx, enum machine_mode, rtx,
637 HOST_WIDE_INT, int);
639 /* Return a memory reference like MEMREF, but whose address is changed by
640 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
641 known to be in OFFSET (possibly 1). */
642 extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT);
644 /* Definitions from emit-rtl.c */
645 #include "emit-rtl.h"
647 /* Return a memory reference like MEMREF, but with its mode widened to
648 MODE and adjusted by OFFSET. */
649 extern rtx widen_memory_access (rtx, enum machine_mode, HOST_WIDE_INT);
651 /* Return a memory reference like MEMREF, but which is known to have a
652 valid address. */
653 extern rtx validize_mem (rtx);
655 /* Given REF, either a MEM or a REG, and T, either the type of X or
656 the expression corresponding to REF, set RTX_UNCHANGING_P if
657 appropriate. */
658 extern void maybe_set_unchanging (rtx, tree);
660 /* Given REF, a MEM, and T, either the type of X or the expression
661 corresponding to REF, set the memory attributes. OBJECTP is nonzero
662 if we are making a new object of this type. */
663 extern void set_mem_attributes (rtx, tree, int);
665 /* Similar, except that BITPOS has not yet been applied to REF, so if
666 we alter MEM_OFFSET according to T then we should subtract BITPOS
667 expecting that it'll be added back in later. */
668 extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT);
670 /* Assemble the static constant template for function entry trampolines. */
671 extern rtx assemble_trampoline_template (void);
673 /* Given rtx, return new rtx whose address won't be affected by
674 any side effects. It has been copied to a new temporary reg. */
675 extern rtx stabilize (rtx);
677 /* Given an rtx, copy all regs it refers to into new temps
678 and return a modified copy that refers to the new temps. */
679 extern rtx copy_all_regs (rtx);
681 /* Copy given rtx to a new temp reg and return that. */
682 extern rtx copy_to_reg (rtx);
684 /* Like copy_to_reg but always make the reg Pmode. */
685 extern rtx copy_addr_to_reg (rtx);
687 /* Like copy_to_reg but always make the reg the specified mode MODE. */
688 extern rtx copy_to_mode_reg (enum machine_mode, rtx);
690 /* Copy given rtx to given temp reg and return that. */
691 extern rtx copy_to_suggested_reg (rtx, rtx, enum machine_mode);
693 /* Copy a value to a register if it isn't already a register.
694 Args are mode (in case value is a constant) and the value. */
695 extern rtx force_reg (enum machine_mode, rtx);
697 /* Return given rtx, copied into a new temp reg if it was in memory. */
698 extern rtx force_not_mem (rtx);
700 /* Return mode and signedness to use when object is promoted. */
701 extern enum machine_mode promote_mode (tree, enum machine_mode, int *, int);
703 /* Remove some bytes from the stack. An rtx says how many. */
704 extern void adjust_stack (rtx);
706 /* Add some bytes to the stack. An rtx says how many. */
707 extern void anti_adjust_stack (rtx);
709 /* This enum is used for the following two functions. */
710 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
712 /* Save the stack pointer at the specified level. */
713 extern void emit_stack_save (enum save_level, rtx *, rtx);
715 /* Restore the stack pointer from a save area of the specified level. */
716 extern void emit_stack_restore (enum save_level, rtx, rtx);
718 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */
719 extern void update_nonlocal_goto_save_area (void);
721 /* Allocate some space on the stack dynamically and return its address. An rtx
722 says how many bytes. */
723 extern rtx allocate_dynamic_stack_space (rtx, rtx, int);
725 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
726 FIRST is a constant and size is a Pmode RTX. These are offsets from the
727 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
728 subtract from the stack. If SIZE is constant, this is done
729 with a fixed number of probes. Otherwise, we must make a loop. */
730 extern void probe_stack_range (HOST_WIDE_INT, rtx);
732 /* Return an rtx that refers to the value returned by a library call
733 in its original home. This becomes invalid if any more code is emitted. */
734 extern rtx hard_libcall_value (enum machine_mode);
736 /* Given an rtx, return an rtx for a value rounded up to a multiple
737 of STACK_BOUNDARY / BITS_PER_UNIT. */
738 extern rtx round_push (rtx);
740 /* Return the mode desired by operand N of a particular bitfield
741 insert/extract insn, or MAX_MACHINE_MODE if no such insn is
742 available. */
744 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
745 extern enum machine_mode
746 mode_for_extraction (enum extraction_pattern, int);
748 extern rtx store_bit_field (rtx, unsigned HOST_WIDE_INT,
749 unsigned HOST_WIDE_INT, enum machine_mode, rtx);
750 extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT,
751 unsigned HOST_WIDE_INT, int, rtx,
752 enum machine_mode, enum machine_mode);
753 extern rtx expand_mult (enum machine_mode, rtx, rtx, rtx, int);
754 extern bool const_mult_add_overflow_p (rtx, rtx, rtx, enum machine_mode, int);
755 extern rtx expand_mult_add (rtx, rtx, rtx, rtx,enum machine_mode, int);
756 extern rtx expand_mult_highpart_adjust (enum machine_mode, rtx, rtx, rtx, rtx, int);
758 extern rtx assemble_static_space (unsigned HOST_WIDE_INT);
759 extern int safe_from_p (rtx, tree, int);
761 /* Call this once to initialize the contents of the optabs
762 appropriately for the current target machine. */
763 extern void init_optabs (void);
764 extern void init_all_optabs (void);
766 /* Call this to initialize an optab function entry. */
767 extern rtx init_one_libfunc (const char *);
769 extern void do_jump_by_parts_equality_rtx (rtx, rtx, rtx);
770 extern void do_jump_by_parts_greater_rtx (enum machine_mode, int, rtx, rtx,
771 rtx, rtx);
773 extern int vector_mode_valid_p (enum machine_mode);
775 #endif /* GCC_EXPR_H */