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 /* Macros to access the slots of a QUEUED rtx.
43 Here rather than in rtl.h because only the expansion pass
44 should ever encounter a QUEUED. */
46 /* The variable for which an increment is queued. */
47 #define QUEUED_VAR(P) XEXP (P, 0)
48 /* If the increment has been emitted, this is the insn
49 that does the increment. It is zero before the increment is emitted.
50 If more than one insn is emitted, this is the first insn. */
51 #define QUEUED_INSN(P) XEXP (P, 1)
52 /* If a pre-increment copy has been generated, this is the copy
53 (it is a temporary reg). Zero if no copy made yet. */
54 #define QUEUED_COPY(P) XEXP (P, 2)
55 /* This is the body to use for the insn to do the increment.
56 It is used to emit the increment. */
57 #define QUEUED_BODY(P) XEXP (P, 3)
58 /* Next QUEUED in the queue. */
59 #define QUEUED_NEXT(P) XEXP (P, 4)
61 /* This is the 4th arg to `expand_expr'.
62 EXPAND_STACK_PARM means we are possibly expanding a call param onto
63 the stack. Choosing a value of 2 isn't special; It just allows
64 some code optimization in store_expr.
65 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
66 EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
67 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
68 is a constant that is not a legitimate address.
69 EXPAND_WRITE means we are only going to write to the resulting rtx.
70 EXPAND_MEMORY means we are interested in a memory result, even if
71 the memory is constant and we could have propagated a constant value. */
72 enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM = 2, EXPAND_SUM,
73 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE,
76 /* Prevent the compiler from deferring stack pops. See
77 inhibit_defer_pop for more information. */
78 #define NO_DEFER_POP (inhibit_defer_pop += 1)
80 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for
82 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
84 /* If a memory-to-memory move would take MOVE_RATIO or more simple
85 move-instruction sequences, we will do a movmem or libcall instead. */
88 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
91 /* If we are optimizing for space (-Os), cut down the default move ratio. */
92 #define MOVE_RATIO (optimize_size ? 3 : 15)
96 /* If a clear memory operation would take CLEAR_RATIO or more simple
97 move-instruction sequences, we will do a clrmem or libcall instead. */
100 #if defined (HAVE_clrmemqi) || defined (HAVE_clrmemhi) || defined (HAVE_clrmemsi) || defined (HAVE_clrmemdi) || defined (HAVE_clrmemti)
101 #define CLEAR_RATIO 2
103 /* If we are optimizing for space, cut down the default clear ratio. */
104 #define CLEAR_RATIO (optimize_size ? 3 : 15)
108 enum direction {none, upward, downward};
110 /* Structure to record the size of a sequence of arguments
111 as the sum of a tree-expression and a constant. This structure is
112 also used to store offsets from the stack, which might be negative,
113 so the variable part must be ssizetype, not sizetype. */
117 HOST_WIDE_INT constant;
121 /* Package up various arg related fields of struct args for
122 locate_and_pad_parm. */
123 struct locate_and_pad_arg_data
125 /* Size of this argument on the stack, rounded up for any padding it
126 gets. If REG_PARM_STACK_SPACE is defined, then register parms are
127 counted here, otherwise they aren't. */
128 struct args_size size;
129 /* Offset of this argument from beginning of stack-args. */
130 struct args_size offset;
131 /* Offset to the start of the stack slot. Different from OFFSET
132 if this arg pads downward. */
133 struct args_size slot_offset;
134 /* The amount that the stack pointer needs to be adjusted to
135 force alignment for the next argument. */
136 struct args_size alignment_pad;
137 /* Which way we should pad this arg. */
138 enum direction where_pad;
141 /* Add the value of the tree INC to the `struct args_size' TO. */
143 #define ADD_PARM_SIZE(TO, INC) \
146 if (host_integerp (inc, 0)) \
147 (TO).constant += tree_low_cst (inc, 0); \
148 else if ((TO).var == 0) \
149 (TO).var = convert (ssizetype, inc); \
151 (TO).var = size_binop (PLUS_EXPR, (TO).var, \
152 convert (ssizetype, inc)); \
155 #define SUB_PARM_SIZE(TO, DEC) \
158 if (host_integerp (dec, 0)) \
159 (TO).constant -= tree_low_cst (dec, 0); \
160 else if ((TO).var == 0) \
161 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \
162 convert (ssizetype, dec)); \
164 (TO).var = size_binop (MINUS_EXPR, (TO).var, \
165 convert (ssizetype, dec)); \
168 /* Convert the implicit sum in a `struct args_size' into a tree
169 of type ssizetype. */
170 #define ARGS_SIZE_TREE(SIZE) \
171 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \
172 : size_binop (PLUS_EXPR, convert (ssizetype, (SIZE).var), \
173 ssize_int ((SIZE).constant)))
175 /* Convert the implicit sum in a `struct args_size' into an rtx. */
176 #define ARGS_SIZE_RTX(SIZE) \
177 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
178 : expand_expr (ARGS_SIZE_TREE (SIZE), NULL_RTX, VOIDmode, 0))
180 /* Supply a default definition for FUNCTION_ARG_PADDING:
181 usually pad upward, but pad short args downward on
182 big-endian machines. */
184 #define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE) \
185 (! BYTES_BIG_ENDIAN \
187 : (((MODE) == BLKmode \
188 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
189 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
190 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
191 ? downward : upward))
193 #ifndef FUNCTION_ARG_PADDING
194 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
195 DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE))
198 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
199 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
202 #ifndef FUNCTION_ARG_BOUNDARY
203 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
206 #ifndef FUNCTION_ARG_PARTIAL_NREGS
207 #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED) 0
210 #ifndef FUNCTION_ARG_CALLEE_COPIES
211 #define FUNCTION_ARG_CALLEE_COPIES(CUM, MODE, TYPE, NAMED) 0
214 tree split_complex_types (tree);
215 tree split_complex_values (tree);
217 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
218 Normally move_insn, so Pmode stack pointer. */
220 #ifndef STACK_SAVEAREA_MODE
221 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
224 /* Supply a default definition of STACK_SIZE_MODE for
225 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
227 #ifndef STACK_SIZE_MODE
228 #define STACK_SIZE_MODE word_mode
231 /* Provide default values for the macros controlling stack checking. */
233 #ifndef STACK_CHECK_BUILTIN
234 #define STACK_CHECK_BUILTIN 0
237 /* The default interval is one page. */
238 #ifndef STACK_CHECK_PROBE_INTERVAL
239 #define STACK_CHECK_PROBE_INTERVAL 4096
242 /* The default is to do a store into the stack. */
243 #ifndef STACK_CHECK_PROBE_LOAD
244 #define STACK_CHECK_PROBE_LOAD 0
247 /* This value is arbitrary, but should be sufficient for most machines. */
248 #ifndef STACK_CHECK_PROTECT
249 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
252 /* Make the maximum frame size be the largest we can and still only need
253 one probe per function. */
254 #ifndef STACK_CHECK_MAX_FRAME_SIZE
255 #define STACK_CHECK_MAX_FRAME_SIZE \
256 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
259 /* This is arbitrary, but should be large enough everywhere. */
260 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
261 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
264 /* Provide a reasonable default for the maximum size of an object to
265 allocate in the fixed frame. We may need to be able to make this
266 controllable by the user at some point. */
267 #ifndef STACK_CHECK_MAX_VAR_SIZE
268 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
271 /* Functions from optabs.c, commonly used, and without need for the optabs
274 /* Passed to expand_simple_binop and expand_binop to say which options
275 to try to use if the requested operation can't be open-coded on the
276 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
277 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
278 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
279 try anything else. */
290 /* Generate code for a simple binary or unary operation. "Simple" in
291 this case means "can be unambiguously described by a (mode, code)
292 pair and mapped to a single optab." */
293 extern rtx expand_simple_binop (enum machine_mode, enum rtx_code, rtx,
294 rtx, rtx, int, enum optab_methods);
295 extern rtx expand_simple_unop (enum machine_mode, enum rtx_code, rtx, rtx,
298 /* Report whether the machine description contains an insn which can
299 perform the operation described by CODE and MODE. */
300 extern int have_insn_for (enum rtx_code, enum machine_mode);
302 /* Emit code to make a call to a constant function or a library call. */
303 extern void emit_libcall_block (rtx, rtx, rtx, rtx);
305 /* Create but don't emit one rtl instruction to perform certain operations.
306 Modes must match; operands must meet the operation's predicates.
307 Likewise for subtraction and for just copying.
308 These do not call protect_from_queue; caller must do so. */
309 extern rtx gen_add2_insn (rtx, rtx);
310 extern rtx gen_add3_insn (rtx, rtx, rtx);
311 extern rtx gen_sub2_insn (rtx, rtx);
312 extern rtx gen_sub3_insn (rtx, rtx, rtx);
313 extern rtx gen_move_insn (rtx, rtx);
314 extern int have_add2_insn (rtx, rtx);
315 extern int have_sub2_insn (rtx, rtx);
317 /* Emit a pair of rtl insns to compare two rtx's and to jump
318 to a label if the comparison is true. */
319 extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx,
320 enum machine_mode, int, rtx);
322 /* Generate code to indirectly jump to a location given in the rtx LOC. */
323 extern void emit_indirect_jump (rtx);
325 #include "insn-config.h"
327 #ifdef HAVE_conditional_move
328 /* Emit a conditional move operation. */
329 rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
330 rtx, rtx, enum machine_mode, int);
332 /* Return nonzero if the conditional move is supported. */
333 int can_conditionally_move_p (enum machine_mode mode);
336 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
337 rtx, rtx, enum machine_mode, int);
340 /* Functions from expmed.c: */
342 /* Arguments MODE, RTX: return an rtx for the negation of that value.
344 extern rtx negate_rtx (enum machine_mode, rtx);
346 /* Expand a logical AND operation. */
347 extern rtx expand_and (enum machine_mode, rtx, rtx, rtx);
349 /* Emit a store-flag operation. */
350 extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
353 /* Like emit_store_flag, but always succeeds. */
354 extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx,
355 enum machine_mode, int, int);
357 /* Functions from loop.c: */
359 /* Given an insn and condition, return a canonical description of
360 the test being made. */
361 extern rtx canonicalize_condition (rtx, rtx, int, rtx *, rtx, int);
363 /* Given a JUMP_INSN, return a canonical description of the test
365 extern rtx get_condition (rtx, rtx *, int);
367 /* Generate a conditional trap instruction. */
368 extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
370 /* Functions from builtins.c: */
371 extern rtx expand_builtin (tree, rtx, rtx, enum machine_mode, int);
372 extern tree std_build_builtin_va_list (void);
373 extern void std_expand_builtin_va_start (tree, rtx);
374 extern rtx std_expand_builtin_va_arg (tree, tree);
375 extern rtx expand_builtin_va_arg (tree, tree);
376 extern rtx default_expand_builtin (tree, rtx, rtx, enum machine_mode, int);
377 extern void expand_builtin_setjmp_setup (rtx, rtx);
378 extern void expand_builtin_setjmp_receiver (rtx);
379 extern void expand_builtin_longjmp (rtx, rtx);
380 extern rtx expand_builtin_saveregs (void);
381 extern void expand_builtin_trap (void);
383 /* Functions from expr.c: */
385 /* This is run once per compilation to set up which modes can be used
386 directly in memory and to initialize the block move optab. */
387 extern void init_expr_once (void);
389 /* This is run at the start of compiling a function. */
390 extern void init_expr (void);
392 /* This is run at the end of compiling a function. */
393 extern void finish_expr_for_function (void);
395 /* Use protect_from_queue to convert a QUEUED expression
396 into something that you can put immediately into an instruction. */
397 extern rtx protect_from_queue (rtx, int);
399 /* Perform all the pending incrementations. */
400 extern void emit_queue (void);
402 /* Tell if something has a queued subexpression. */
403 extern int queued_subexp_p (rtx);
405 /* Emit some rtl insns to move data between rtx's, converting machine modes.
406 Both modes must be floating or both fixed. */
407 extern void convert_move (rtx, rtx, int);
409 /* Convert an rtx to specified machine mode and return the result. */
410 extern rtx convert_to_mode (enum machine_mode, rtx, int);
412 /* Convert an rtx to MODE from OLDMODE and return the result. */
413 extern rtx convert_modes (enum machine_mode, enum machine_mode, rtx, int);
415 /* Emit code to move a block Y to a block X. */
417 enum block_op_methods
424 extern void init_block_move_fn (const char *);
425 extern void init_block_clear_fn (const char *);
427 extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods);
429 /* Copy all or part of a value X into registers starting at REGNO.
430 The number of registers to be filled is NREGS. */
431 extern void move_block_to_reg (int, rtx, int, enum machine_mode);
433 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
434 The number of registers to be filled is NREGS. */
435 extern void move_block_from_reg (int, rtx, int);
437 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
438 extern rtx gen_group_rtx (rtx);
440 /* Load a BLKmode value into non-consecutive registers represented by a
442 extern void emit_group_load (rtx, rtx, tree, int);
444 /* Move a non-consecutive group of registers represented by a PARALLEL into
445 a non-consecutive group of registers represented by a PARALLEL. */
446 extern void emit_group_move (rtx, rtx);
448 /* Store a BLKmode value from non-consecutive registers represented by a
450 extern void emit_group_store (rtx, rtx, tree, int);
452 /* Copy BLKmode object from a set of registers. */
453 extern rtx copy_blkmode_from_reg (rtx, rtx, tree);
455 /* Mark REG as holding a parameter for the next CALL_INSN. */
456 extern void use_reg (rtx *, rtx);
458 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
459 for the next CALL_INSN. */
460 extern void use_regs (rtx *, int, int);
462 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
463 extern void use_group_regs (rtx *, rtx);
465 /* Write zeros through the storage of OBJECT.
466 If OBJECT has BLKmode, SIZE is its length in bytes. */
467 extern rtx clear_storage (rtx, rtx);
469 /* Determine whether the LEN bytes can be moved by using several move
470 instructions. Return nonzero if a call to move_by_pieces should
472 extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
474 /* Return nonzero if it is desirable to store LEN bytes generated by
475 CONSTFUN with several move instructions by store_by_pieces
476 function. CONSTFUNDATA is a pointer which will be passed as argument
477 in every CONSTFUN call.
478 ALIGN is maximum alignment we can assume. */
479 extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
480 rtx (*) (void *, HOST_WIDE_INT,
482 void *, unsigned int);
484 /* Generate several move instructions to store LEN bytes generated by
485 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
486 pointer which will be passed as argument in every CONSTFUN call.
487 ALIGN is maximum alignment we can assume.
489 extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT,
490 rtx (*) (void *, HOST_WIDE_INT, enum machine_mode),
491 void *, unsigned int, int);
493 /* Emit insns to set X from Y. */
494 extern rtx emit_move_insn (rtx, rtx);
496 /* Emit insns to set X from Y, with no frills. */
497 extern rtx emit_move_insn_1 (rtx, rtx);
499 /* Push a block of length SIZE (perhaps variable)
500 and return an rtx to address the beginning of the block. */
501 extern rtx push_block (rtx, int, int);
503 /* Generate code to push something onto the stack, given its mode and type. */
504 extern void emit_push_insn (rtx, enum machine_mode, tree, rtx, unsigned int,
505 int, rtx, int, rtx, rtx, int, rtx);
507 /* Expand an assignment that stores the value of FROM into TO. */
508 extern rtx expand_assignment (tree, tree, int);
510 /* Generate code for computing expression EXP,
511 and storing the value into TARGET.
512 If SUGGEST_REG is nonzero, copy the value through a register
513 and return that register, if that is possible. */
514 extern rtx store_expr (tree, rtx, int);
516 /* Given an rtx that may include add and multiply operations,
517 generate them as insns and return a pseudo-reg containing the value.
518 Useful after calling expand_expr with 1 as sum_ok. */
519 extern rtx force_operand (rtx, rtx);
521 /* Work horse for expand_expr. */
522 extern rtx expand_expr_real (tree, rtx, enum machine_mode,
523 enum expand_modifier, rtx *);
525 /* Generate code for computing expression EXP.
526 An rtx for the computed value is returned. The value is never null.
527 In the case of a void EXP, const0_rtx is returned. */
529 expand_expr (tree exp, rtx target, enum machine_mode mode,
530 enum expand_modifier modifier)
532 return expand_expr_real (exp, target, mode, modifier, NULL);
535 extern void expand_var (tree);
537 /* At the start of a function, record that we have no previously-pushed
538 arguments waiting to be popped. */
539 extern void init_pending_stack_adjust (void);
541 /* When exiting from function, if safe, clear out any pending stack adjust
542 so the adjustment won't get done. */
543 extern void clear_pending_stack_adjust (void);
545 /* Pop any previously-pushed arguments that have not been popped yet. */
546 extern void do_pending_stack_adjust (void);
548 /* Return the tree node and offset if a given argument corresponds to
549 a string constant. */
550 extern tree string_constant (tree, tree *);
552 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
553 extern void jumpifnot (tree, rtx);
555 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
556 extern void jumpif (tree, rtx);
558 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
559 the result is zero, or IF_TRUE_LABEL if the result is one. */
560 extern void do_jump (tree, rtx, rtx);
562 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
563 extern rtx compare_from_rtx (rtx, rtx, enum rtx_code, int, enum machine_mode,
565 extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int,
566 enum machine_mode, rtx, rtx, rtx);
568 /* Two different ways of generating switch statements. */
569 extern int try_casesi (tree, tree, tree, tree, rtx, rtx);
570 extern int try_tablejump (tree, tree, tree, tree, rtx, rtx);
572 /* Smallest number of adjacent cases before we use a jump table.
573 XXX Should be a target hook. */
574 extern unsigned int case_values_threshold (void);
576 /* Functions from alias.c */
578 /* extern HOST_WIDE_INT get_varargs_alias_set (void); */
579 /* extern HOST_WIDE_INT get_frame_alias_set (void); */
580 /* extern void record_base_value (unsigned int, rtx, int); */
581 /* extern void record_alias_subset (HOST_WIDE_INT, HOST_WIDE_INT); */
582 /* extern HOST_WIDE_INT new_alias_set (void); */
583 /* extern int can_address_p (tree); */
586 /* rtl.h and tree.h were included. */
587 /* Return an rtx for the size in bytes of the value of an expr. */
588 extern rtx expr_size (tree);
590 /* Return a wide integer for the size in bytes of the value of EXP, or -1
591 if the size can vary or is larger than an integer. */
592 extern HOST_WIDE_INT int_expr_size (tree);
594 /* Convert a stack slot address ADDR valid in function FNDECL
595 into an address valid in this function (using a static chain). */
596 extern rtx fix_lexical_addr (rtx, tree);
598 /* Return the address of the trampoline for entering nested fn FUNCTION. */
599 extern rtx trampoline_address (tree);
601 /* Return an rtx that refers to the value returned by a function
602 in its original home. This becomes invalid if any more code is emitted. */
603 extern rtx hard_function_value (tree, tree, int);
605 extern rtx prepare_call_address (rtx, rtx, rtx *, int, int);
607 extern rtx expand_call (tree, rtx, int);
609 extern void fixup_tail_calls (void);
612 extern rtx expand_shift (enum tree_code, enum machine_mode, rtx, tree, rtx,
614 extern rtx expand_divmod (int, enum tree_code, enum machine_mode, rtx, rtx,
618 extern void locate_and_pad_parm (enum machine_mode, tree, int, int, tree,
620 struct locate_and_pad_arg_data *);
622 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
623 extern rtx label_rtx (tree);
625 /* As label_rtx, but additionally the label is placed on the forced label
626 list of its containing function (i.e. it is treated as reachable even
627 if how is not obvious). */
628 extern rtx force_label_rtx (tree);
630 /* Indicate how an input argument register was promoted. */
631 extern rtx promoted_input_arg (unsigned int, enum machine_mode *, int *);
633 /* Return an rtx like arg but sans any constant terms.
634 Returns the original rtx if it has no constant terms.
635 The constant terms are added and stored via a second arg. */
636 extern rtx eliminate_constant_term (rtx, rtx *);
638 /* Convert arg to a valid memory address for specified machine mode,
639 by emitting insns to perform arithmetic if nec. */
640 extern rtx memory_address (enum machine_mode, rtx);
642 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
643 extern rtx memory_address_noforce (enum machine_mode, rtx);
645 /* Return a memory reference like MEMREF, but with its mode changed
646 to MODE and its address changed to ADDR.
647 (VOIDmode means don't change the mode.
648 NULL for ADDR means don't change the address.) */
649 extern rtx change_address (rtx, enum machine_mode, rtx);
651 /* Return a memory reference like MEMREF, but with its mode changed
652 to MODE and its address offset by OFFSET bytes. */
653 #define adjust_address(MEMREF, MODE, OFFSET) \
654 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
656 /* Likewise, but the reference is not required to be valid. */
657 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
658 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
660 /* Return a memory reference like MEMREF, but with its mode changed
661 to MODE and its address changed to ADDR, which is assumed to be
662 increased by OFFSET bytes from MEMREF. */
663 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
664 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
666 /* Likewise, but the reference is not required to be valid. */
667 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
668 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
670 extern rtx adjust_address_1 (rtx, enum machine_mode, HOST_WIDE_INT, int, int);
671 extern rtx adjust_automodify_address_1 (rtx, enum machine_mode, rtx,
674 /* Return a memory reference like MEMREF, but whose address is changed by
675 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
676 known to be in OFFSET (possibly 1). */
677 extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT);
679 /* Definitions from emit-rtl.c */
680 #include "emit-rtl.h"
682 /* Return a memory reference like MEMREF, but with its mode widened to
683 MODE and adjusted by OFFSET. */
684 extern rtx widen_memory_access (rtx, enum machine_mode, HOST_WIDE_INT);
686 /* Return a memory reference like MEMREF, but which is known to have a
688 extern rtx validize_mem (rtx);
690 /* Given REF, either a MEM or a REG, and T, either the type of X or
691 the expression corresponding to REF, set RTX_UNCHANGING_P if
693 extern void maybe_set_unchanging (rtx, tree);
695 /* Given REF, a MEM, and T, either the type of X or the expression
696 corresponding to REF, set the memory attributes. OBJECTP is nonzero
697 if we are making a new object of this type. */
698 extern void set_mem_attributes (rtx, tree, int);
700 /* Similar, except that BITPOS has not yet been applied to REF, so if
701 we alter MEM_OFFSET according to T then we should subtract BITPOS
702 expecting that it'll be added back in later. */
703 extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT);
705 /* Assemble the static constant template for function entry trampolines. */
706 extern rtx assemble_trampoline_template (void);
708 /* Given rtx, return new rtx whose address won't be affected by
709 any side effects. It has been copied to a new temporary reg. */
710 extern rtx stabilize (rtx);
712 /* Given an rtx, copy all regs it refers to into new temps
713 and return a modified copy that refers to the new temps. */
714 extern rtx copy_all_regs (rtx);
716 /* Copy given rtx to a new temp reg and return that. */
717 extern rtx copy_to_reg (rtx);
719 /* Like copy_to_reg but always make the reg Pmode. */
720 extern rtx copy_addr_to_reg (rtx);
722 /* Like copy_to_reg but always make the reg the specified mode MODE. */
723 extern rtx copy_to_mode_reg (enum machine_mode, rtx);
725 /* Copy given rtx to given temp reg and return that. */
726 extern rtx copy_to_suggested_reg (rtx, rtx, enum machine_mode);
728 /* Copy a value to a register if it isn't already a register.
729 Args are mode (in case value is a constant) and the value. */
730 extern rtx force_reg (enum machine_mode, rtx);
732 /* Return given rtx, copied into a new temp reg if it was in memory. */
733 extern rtx force_not_mem (rtx);
735 /* Return mode and signedness to use when object is promoted. */
736 extern enum machine_mode promote_mode (tree, enum machine_mode, int *, int);
738 /* Remove some bytes from the stack. An rtx says how many. */
739 extern void adjust_stack (rtx);
741 /* Add some bytes to the stack. An rtx says how many. */
742 extern void anti_adjust_stack (rtx);
744 /* This enum is used for the following two functions. */
745 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
747 /* Save the stack pointer at the specified level. */
748 extern void emit_stack_save (enum save_level, rtx *, rtx);
750 /* Restore the stack pointer from a save area of the specified level. */
751 extern void emit_stack_restore (enum save_level, rtx, rtx);
753 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */
754 extern void update_nonlocal_goto_save_area (void);
756 /* Allocate some space on the stack dynamically and return its address. An rtx
757 says how many bytes. */
758 extern rtx allocate_dynamic_stack_space (rtx, rtx, int);
760 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
761 FIRST is a constant and size is a Pmode RTX. These are offsets from the
762 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
763 subtract from the stack. If SIZE is constant, this is done
764 with a fixed number of probes. Otherwise, we must make a loop. */
765 extern void probe_stack_range (HOST_WIDE_INT, rtx);
767 /* Return an rtx that refers to the value returned by a library call
768 in its original home. This becomes invalid if any more code is emitted. */
769 extern rtx hard_libcall_value (enum machine_mode);
771 /* Given an rtx, return an rtx for a value rounded up to a multiple
772 of STACK_BOUNDARY / BITS_PER_UNIT. */
773 extern rtx round_push (rtx);
775 /* Return the mode desired by operand N of a particular bitfield
776 insert/extract insn, or MAX_MACHINE_MODE if no such insn is
779 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
780 extern enum machine_mode
781 mode_for_extraction (enum extraction_pattern, int);
783 extern rtx store_bit_field (rtx, unsigned HOST_WIDE_INT,
784 unsigned HOST_WIDE_INT, enum machine_mode, rtx);
785 extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT,
786 unsigned HOST_WIDE_INT, int, rtx,
787 enum machine_mode, enum machine_mode);
788 extern rtx expand_mult (enum machine_mode, rtx, rtx, rtx, int);
789 extern bool const_mult_add_overflow_p (rtx, rtx, rtx, enum machine_mode, int);
790 extern rtx expand_mult_add (rtx, rtx, rtx, rtx,enum machine_mode, int);
791 extern rtx expand_mult_highpart_adjust (enum machine_mode, rtx, rtx, rtx, rtx, int);
793 extern rtx assemble_static_space (unsigned HOST_WIDE_INT);
794 extern int safe_from_p (rtx, tree, int);
796 /* Call this once to initialize the contents of the optabs
797 appropriately for the current target machine. */
798 extern void init_optabs (void);
799 extern void init_all_optabs (void);
801 /* Call this to initialize an optab function entry. */
802 extern rtx init_one_libfunc (const char *);
804 extern void do_jump_by_parts_equality_rtx (rtx, rtx, rtx);
805 extern void do_jump_by_parts_greater_rtx (enum machine_mode, int, rtx, rtx,
808 extern int vector_mode_valid_p (enum machine_mode);
810 #endif /* GCC_EXPR_H */