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 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
22 /* The default branch cost is 1. */
27 /* Macros to access the slots of a QUEUED rtx.
28 Here rather than in rtl.h because only the expansion pass
29 should ever encounter a QUEUED. */
31 /* The variable for which an increment is queued. */
32 #define QUEUED_VAR(P) XEXP (P, 0)
33 /* If the increment has been emitted, this is the insn
34 that does the increment. It is zero before the increment is emitted.
35 If more than one insn is emitted, this is the first insn. */
36 #define QUEUED_INSN(P) XEXP (P, 1)
37 /* If a pre-increment copy has been generated, this is the copy
38 (it is a temporary reg). Zero if no copy made yet. */
39 #define QUEUED_COPY(P) XEXP (P, 2)
40 /* This is the body to use for the insn to do the increment.
41 It is used to emit the increment. */
42 #define QUEUED_BODY(P) XEXP (P, 3)
43 /* Next QUEUED in the queue. */
44 #define QUEUED_NEXT(P) XEXP (P, 4)
46 /* This is the 4th arg to `expand_expr'.
47 EXPAND_STACK_PARM means we are possibly expanding a call param onto
48 the stack. Choosing a value of 2 isn't special; It just allows
49 some code optimization in store_expr.
50 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
51 EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
52 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
53 is a constant that is not a legitimate address.
54 EXPAND_WRITE means we are only going to write to the resulting rtx.
55 EXPAND_MEMORY means we are interested in a memory result, even if
56 the memory is constant and we could have propagated a constant value. */
57 enum expand_modifier
{EXPAND_NORMAL
= 0, EXPAND_STACK_PARM
= 2, EXPAND_SUM
,
58 EXPAND_CONST_ADDRESS
, EXPAND_INITIALIZER
, EXPAND_WRITE
,
61 /* Prevent the compiler from deferring stack pops. See
62 inhibit_defer_pop for more information. */
63 #define NO_DEFER_POP (inhibit_defer_pop += 1)
65 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for
67 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
69 /* If a memory-to-memory move would take MOVE_RATIO or more simple
70 move-instruction sequences, we will do a movstr or libcall instead. */
73 #if defined (HAVE_movstrqi) || defined (HAVE_movstrhi) || defined (HAVE_movstrsi) || defined (HAVE_movstrdi) || defined (HAVE_movstrti)
76 /* If we are optimizing for space (-Os), cut down the default move ratio. */
77 #define MOVE_RATIO (optimize_size ? 3 : 15)
81 /* If a clear memory operation would take CLEAR_RATIO or more simple
82 move-instruction sequences, we will do a clrstr or libcall instead. */
85 #if defined (HAVE_clrstrqi) || defined (HAVE_clrstrhi) || defined (HAVE_clrstrsi) || defined (HAVE_clrstrdi) || defined (HAVE_clrstrti)
88 /* If we are optimizing for space, cut down the default clear ratio. */
89 #define CLEAR_RATIO (optimize_size ? 3 : 15)
93 enum direction
{none
, upward
, downward
};
95 /* Structure to record the size of a sequence of arguments
96 as the sum of a tree-expression and a constant. This structure is
97 also used to store offsets from the stack, which might be negative,
98 so the variable part must be ssizetype, not sizetype. */
102 HOST_WIDE_INT constant
;
106 /* Package up various arg related fields of struct args for
107 locate_and_pad_parm. */
108 struct locate_and_pad_arg_data
110 /* Size of this argument on the stack, rounded up for any padding it
111 gets. If REG_PARM_STACK_SPACE is defined, then register parms are
112 counted here, otherwise they aren't. */
113 struct args_size size
;
114 /* Offset of this argument from beginning of stack-args. */
115 struct args_size offset
;
116 /* Offset to the start of the stack slot. Different from OFFSET
117 if this arg pads downward. */
118 struct args_size slot_offset
;
119 /* The amount that the stack pointer needs to be adjusted to
120 force alignment for the next argument. */
121 struct args_size alignment_pad
;
122 /* Which way we should pad this arg. */
123 enum direction where_pad
;
126 /* Add the value of the tree INC to the `struct args_size' TO. */
128 #define ADD_PARM_SIZE(TO, INC) \
131 if (host_integerp (inc, 0)) \
132 (TO).constant += tree_low_cst (inc, 0); \
133 else if ((TO).var == 0) \
134 (TO).var = convert (ssizetype, inc); \
136 (TO).var = size_binop (PLUS_EXPR, (TO).var, \
137 convert (ssizetype, inc)); \
140 #define SUB_PARM_SIZE(TO, DEC) \
143 if (host_integerp (dec, 0)) \
144 (TO).constant -= tree_low_cst (dec, 0); \
145 else if ((TO).var == 0) \
146 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \
147 convert (ssizetype, dec)); \
149 (TO).var = size_binop (MINUS_EXPR, (TO).var, \
150 convert (ssizetype, dec)); \
153 /* Convert the implicit sum in a `struct args_size' into a tree
154 of type ssizetype. */
155 #define ARGS_SIZE_TREE(SIZE) \
156 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \
157 : size_binop (PLUS_EXPR, convert (ssizetype, (SIZE).var), \
158 ssize_int ((SIZE).constant)))
160 /* Convert the implicit sum in a `struct args_size' into an rtx. */
161 #define ARGS_SIZE_RTX(SIZE) \
162 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
163 : expand_expr (ARGS_SIZE_TREE (SIZE), NULL_RTX, VOIDmode, 0))
165 /* Supply a default definition for FUNCTION_ARG_PADDING:
166 usually pad upward, but pad short args downward on
167 big-endian machines. */
169 #define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE) \
170 (! BYTES_BIG_ENDIAN \
172 : (((MODE) == BLKmode \
173 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
174 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
175 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
176 ? downward : upward))
178 #ifndef FUNCTION_ARG_PADDING
179 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
180 DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE))
183 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
184 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
187 #ifndef FUNCTION_ARG_BOUNDARY
188 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
191 /* Define to nonzero if complex arguments should be split into their
192 corresponding components. */
193 #ifndef SPLIT_COMPLEX_ARGS
194 #define SPLIT_COMPLEX_ARGS 0
196 tree
split_complex_types (tree
);
197 tree
split_complex_values (tree
);
199 /* Nonzero if we do not know how to pass TYPE solely in registers. */
200 extern bool default_must_pass_in_stack (enum machine_mode
, tree
);
201 #ifndef MUST_PASS_IN_STACK
202 #define MUST_PASS_IN_STACK(MODE,TYPE) default_must_pass_in_stack(MODE, TYPE)
205 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
206 Normally move_insn, so Pmode stack pointer. */
208 #ifndef STACK_SAVEAREA_MODE
209 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
212 /* Supply a default definition of STACK_SIZE_MODE for
213 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
215 #ifndef STACK_SIZE_MODE
216 #define STACK_SIZE_MODE word_mode
219 /* Provide default values for the macros controlling stack checking. */
221 #ifndef STACK_CHECK_BUILTIN
222 #define STACK_CHECK_BUILTIN 0
225 /* The default interval is one page. */
226 #ifndef STACK_CHECK_PROBE_INTERVAL
227 #define STACK_CHECK_PROBE_INTERVAL 4096
230 /* The default is to do a store into the stack. */
231 #ifndef STACK_CHECK_PROBE_LOAD
232 #define STACK_CHECK_PROBE_LOAD 0
235 /* This value is arbitrary, but should be sufficient for most machines. */
236 #ifndef STACK_CHECK_PROTECT
237 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
240 /* Make the maximum frame size be the largest we can and still only need
241 one probe per function. */
242 #ifndef STACK_CHECK_MAX_FRAME_SIZE
243 #define STACK_CHECK_MAX_FRAME_SIZE \
244 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
247 /* This is arbitrary, but should be large enough everywhere. */
248 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
249 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
252 /* Provide a reasonable default for the maximum size of an object to
253 allocate in the fixed frame. We may need to be able to make this
254 controllable by the user at some point. */
255 #ifndef STACK_CHECK_MAX_VAR_SIZE
256 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
259 /* Functions from optabs.c, commonly used, and without need for the optabs
262 /* Passed to expand_simple_binop and expand_binop to say which options
263 to try to use if the requested operation can't be open-coded on the
264 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
265 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
266 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
267 try anything else. */
278 /* Generate code for a simple binary or unary operation. "Simple" in
279 this case means "can be unambiguously described by a (mode, code)
280 pair and mapped to a single optab." */
281 extern rtx
expand_simple_binop (enum machine_mode
, enum rtx_code
, rtx
,
282 rtx
, rtx
, int, enum optab_methods
);
283 extern rtx
expand_simple_unop (enum machine_mode
, enum rtx_code
, rtx
, rtx
,
286 /* Report whether the machine description contains an insn which can
287 perform the operation described by CODE and MODE. */
288 extern int have_insn_for (enum rtx_code
, enum machine_mode
);
290 /* Emit code to make a call to a constant function or a library call. */
291 extern void emit_libcall_block (rtx
, rtx
, rtx
, rtx
);
293 /* Create but don't emit one rtl instruction to perform certain operations.
294 Modes must match; operands must meet the operation's predicates.
295 Likewise for subtraction and for just copying.
296 These do not call protect_from_queue; caller must do so. */
297 extern rtx
gen_add2_insn (rtx
, rtx
);
298 extern rtx
gen_add3_insn (rtx
, rtx
, rtx
);
299 extern rtx
gen_sub2_insn (rtx
, rtx
);
300 extern rtx
gen_sub3_insn (rtx
, rtx
, rtx
);
301 extern rtx
gen_move_insn (rtx
, rtx
);
302 extern int have_add2_insn (rtx
, rtx
);
303 extern int have_sub2_insn (rtx
, rtx
);
305 /* Emit a pair of rtl insns to compare two rtx's and to jump
306 to a label if the comparison is true. */
307 extern void emit_cmp_and_jump_insns (rtx
, rtx
, enum rtx_code
, rtx
,
308 enum machine_mode
, int, rtx
);
310 /* Generate code to indirectly jump to a location given in the rtx LOC. */
311 extern void emit_indirect_jump (rtx
);
313 #ifdef HAVE_conditional_move
314 /* Emit a conditional move operation. */
315 rtx
emit_conditional_move (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
316 rtx
, rtx
, enum machine_mode
, int);
318 /* Return nonzero if the conditional move is supported. */
319 int can_conditionally_move_p (enum machine_mode mode
);
322 rtx
emit_conditional_add (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
323 rtx
, rtx
, enum machine_mode
, int);
326 /* Functions from expmed.c: */
328 /* Arguments MODE, RTX: return an rtx for the negation of that value.
330 extern rtx
negate_rtx (enum machine_mode
, rtx
);
332 /* Expand a logical AND operation. */
333 extern rtx
expand_and (enum machine_mode
, rtx
, rtx
, rtx
);
335 /* Emit a store-flag operation. */
336 extern rtx
emit_store_flag (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
339 /* Like emit_store_flag, but always succeeds. */
340 extern rtx
emit_store_flag_force (rtx
, enum rtx_code
, rtx
, rtx
,
341 enum machine_mode
, int, int);
343 /* Functions from loop.c: */
345 /* Given an insn and condition, return a canonical description of
346 the test being made. */
347 extern rtx
canonicalize_condition (rtx
, rtx
, int, rtx
*, rtx
, int);
349 /* Given a JUMP_INSN, return a canonical description of the test
351 extern rtx
get_condition (rtx
, rtx
*, int);
353 /* Generate a conditional trap instruction. */
354 extern rtx
gen_cond_trap (enum rtx_code
, rtx
, rtx
, rtx
);
356 /* Functions from builtins.c: */
357 extern rtx
expand_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
358 extern tree
std_build_builtin_va_list (void);
359 extern void std_expand_builtin_va_start (tree
, rtx
);
360 extern rtx
std_expand_builtin_va_arg (tree
, tree
);
361 extern rtx
expand_builtin_va_arg (tree
, tree
);
362 extern rtx
default_expand_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
363 extern void expand_builtin_setjmp_setup (rtx
, rtx
);
364 extern void expand_builtin_setjmp_receiver (rtx
);
365 extern void expand_builtin_longjmp (rtx
, rtx
);
366 extern rtx
expand_builtin_saveregs (void);
367 extern void expand_builtin_trap (void);
368 extern HOST_WIDE_INT
get_varargs_alias_set (void);
369 extern HOST_WIDE_INT
get_frame_alias_set (void);
370 extern void record_base_value (unsigned int, rtx
, int);
371 extern void record_alias_subset (HOST_WIDE_INT
, HOST_WIDE_INT
);
372 extern HOST_WIDE_INT
new_alias_set (void);
373 extern int can_address_p (tree
);
375 /* Functions from expr.c: */
377 /* This is run once per compilation to set up which modes can be used
378 directly in memory and to initialize the block move optab. */
379 extern void init_expr_once (void);
381 /* This is run at the start of compiling a function. */
382 extern void init_expr (void);
384 /* This is run at the end of compiling a function. */
385 extern void finish_expr_for_function (void);
387 /* Use protect_from_queue to convert a QUEUED expression
388 into something that you can put immediately into an instruction. */
389 extern rtx
protect_from_queue (rtx
, int);
391 /* Perform all the pending incrementations. */
392 extern void emit_queue (void);
394 /* Tell if something has a queued subexpression. */
395 extern int queued_subexp_p (rtx
);
397 /* Emit some rtl insns to move data between rtx's, converting machine modes.
398 Both modes must be floating or both fixed. */
399 extern void convert_move (rtx
, rtx
, int);
401 /* Convert an rtx to specified machine mode and return the result. */
402 extern rtx
convert_to_mode (enum machine_mode
, rtx
, int);
404 /* Convert an rtx to MODE from OLDMODE and return the result. */
405 extern rtx
convert_modes (enum machine_mode
, enum machine_mode
, rtx
, int);
407 /* Emit code to move a block Y to a block X. */
409 enum block_op_methods
416 extern void init_block_move_fn (const char *);
417 extern void init_block_clear_fn (const char *);
419 extern rtx
emit_block_move (rtx
, rtx
, rtx
, enum block_op_methods
);
421 /* Copy all or part of a value X into registers starting at REGNO.
422 The number of registers to be filled is NREGS. */
423 extern void move_block_to_reg (int, rtx
, int, enum machine_mode
);
425 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
426 The number of registers to be filled is NREGS. */
427 extern void move_block_from_reg (int, rtx
, int);
429 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
430 extern rtx
gen_group_rtx (rtx
);
432 /* Load a BLKmode value into non-consecutive registers represented by a
434 extern void emit_group_load (rtx
, rtx
, tree
, int);
436 /* Move a non-consecutive group of registers represented by a PARALLEL into
437 a non-consecutive group of registers represented by a PARALLEL. */
438 extern void emit_group_move (rtx
, rtx
);
440 /* Store a BLKmode value from non-consecutive registers represented by a
442 extern void emit_group_store (rtx
, rtx
, tree
, int);
444 /* Copy BLKmode object from a set of registers. */
445 extern rtx
copy_blkmode_from_reg (rtx
, rtx
, tree
);
447 /* Mark REG as holding a parameter for the next CALL_INSN. */
448 extern void use_reg (rtx
*, rtx
);
450 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
451 for the next CALL_INSN. */
452 extern void use_regs (rtx
*, int, int);
454 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
455 extern void use_group_regs (rtx
*, rtx
);
457 /* Write zeros through the storage of OBJECT.
458 If OBJECT has BLKmode, SIZE is its length in bytes. */
459 extern rtx
clear_storage (rtx
, rtx
);
461 /* Determine whether the LEN bytes can be moved by using several move
462 instructions. Return nonzero if a call to move_by_pieces should
464 extern int can_move_by_pieces (unsigned HOST_WIDE_INT
, unsigned int);
466 /* Return nonzero if it is desirable to store LEN bytes generated by
467 CONSTFUN with several move instructions by store_by_pieces
468 function. CONSTFUNDATA is a pointer which will be passed as argument
469 in every CONSTFUN call.
470 ALIGN is maximum alignment we can assume. */
471 extern int can_store_by_pieces (unsigned HOST_WIDE_INT
,
472 rtx (*) (void *, HOST_WIDE_INT
,
474 void *, unsigned int);
476 /* Generate several move instructions to store LEN bytes generated by
477 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
478 pointer which will be passed as argument in every CONSTFUN call.
479 ALIGN is maximum alignment we can assume.
481 extern rtx
store_by_pieces (rtx
, unsigned HOST_WIDE_INT
,
482 rtx (*) (void *, HOST_WIDE_INT
, enum machine_mode
),
483 void *, unsigned int, int);
485 /* Emit insns to set X from Y. */
486 extern rtx
emit_move_insn (rtx
, rtx
);
488 /* Emit insns to set X from Y, with no frills. */
489 extern rtx
emit_move_insn_1 (rtx
, rtx
);
491 /* Push a block of length SIZE (perhaps variable)
492 and return an rtx to address the beginning of the block. */
493 extern rtx
push_block (rtx
, int, int);
495 /* Generate code to push something onto the stack, given its mode and type. */
496 extern void emit_push_insn (rtx
, enum machine_mode
, tree
, rtx
, unsigned int,
497 int, rtx
, int, rtx
, rtx
, int, rtx
);
499 /* Expand an assignment that stores the value of FROM into TO. */
500 extern rtx
expand_assignment (tree
, tree
, int);
502 /* Generate code for computing expression EXP,
503 and storing the value into TARGET.
504 If SUGGEST_REG is nonzero, copy the value through a register
505 and return that register, if that is possible. */
506 extern rtx
store_expr (tree
, rtx
, int);
508 /* Given an rtx that may include add and multiply operations,
509 generate them as insns and return a pseudo-reg containing the value.
510 Useful after calling expand_expr with 1 as sum_ok. */
511 extern rtx
force_operand (rtx
, rtx
);
513 /* Return an object on the placeholder list that matches EXP, a
514 PLACEHOLDER_EXPR. An object "matches" if it is of the type of the
515 PLACEHOLDER_EXPR or a pointer type to it. For further information, see
516 tree.def. If no such object is found, abort. If PLIST is nonzero, it is
517 a location which initially points to a starting location in the
518 placeholder list (zero means start of the list) and where a pointer into
519 the placeholder list at which the object is found is placed. */
520 extern tree
find_placeholder (tree
, tree
*);
522 /* Generate code for computing expression EXP.
523 An rtx for the computed value is returned. The value is never null.
524 In the case of a void EXP, const0_rtx is returned. */
525 #define expand_expr(EXP, TARGET, MODE, MODIFIER) \
526 expand_expr_real((EXP), (TARGET), (MODE), (MODIFIER), NULL)
527 extern rtx
expand_expr_real (tree
, rtx
, enum machine_mode
,
528 enum expand_modifier
, rtx
*);
530 /* At the start of a function, record that we have no previously-pushed
531 arguments waiting to be popped. */
532 extern void init_pending_stack_adjust (void);
534 /* When exiting from function, if safe, clear out any pending stack adjust
535 so the adjustment won't get done. */
536 extern void clear_pending_stack_adjust (void);
538 /* Pop any previously-pushed arguments that have not been popped yet. */
539 extern void do_pending_stack_adjust (void);
541 /* Return the tree node and offset if a given argument corresponds to
542 a string constant. */
543 extern tree
string_constant (tree
, tree
*);
545 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
546 extern void jumpifnot (tree
, rtx
);
548 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
549 extern void jumpif (tree
, rtx
);
551 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
552 the result is zero, or IF_TRUE_LABEL if the result is one. */
553 extern void do_jump (tree
, rtx
, rtx
);
555 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
556 extern rtx
compare_from_rtx (rtx
, rtx
, enum rtx_code
, int, enum machine_mode
,
558 extern void do_compare_rtx_and_jump (rtx
, rtx
, enum rtx_code
, int,
559 enum machine_mode
, rtx
, rtx
, rtx
);
561 /* Two different ways of generating switch statements. */
562 extern int try_casesi (tree
, tree
, tree
, tree
, rtx
, rtx
);
563 extern int try_tablejump (tree
, tree
, tree
, tree
, rtx
, rtx
);
565 /* Smallest number of adjacent cases before we use a jump table.
566 XXX Should be a target hook. */
567 extern unsigned int case_values_threshold (void);
570 /* rtl.h and tree.h were included. */
571 /* Return an rtx for the size in bytes of the value of an expr. */
572 extern rtx
expr_size (tree
);
574 /* Return a wide integer for the size in bytes of the value of EXP, or -1
575 if the size can vary or is larger than an integer. */
576 extern HOST_WIDE_INT
int_expr_size (tree
);
578 extern rtx
lookup_static_chain (tree
);
580 /* Convert a stack slot address ADDR valid in function FNDECL
581 into an address valid in this function (using a static chain). */
582 extern rtx
fix_lexical_addr (rtx
, tree
);
584 /* Return the address of the trampoline for entering nested fn FUNCTION. */
585 extern rtx
trampoline_address (tree
);
587 /* Return an rtx that refers to the value returned by a function
588 in its original home. This becomes invalid if any more code is emitted. */
589 extern rtx
hard_function_value (tree
, tree
, int);
591 extern rtx
prepare_call_address (rtx
, tree
, rtx
*, int, int);
593 extern rtx
expand_call (tree
, rtx
, int);
596 extern rtx
expand_shift (enum tree_code
, enum machine_mode
, rtx
, tree
, rtx
,
598 extern rtx
expand_divmod (int, enum tree_code
, enum machine_mode
, rtx
, rtx
,
602 extern void locate_and_pad_parm (enum machine_mode
, tree
, int, int, tree
,
604 struct locate_and_pad_arg_data
*);
605 extern rtx
expand_inline_function (tree
, tree
, rtx
, int, tree
, rtx
);
607 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
608 extern rtx
label_rtx (tree
);
610 /* As label_rtx, but additionally the label is placed on the forced label
611 list of its containing function (i.e. it is treated as reachable even
612 if how is not obvious). */
613 extern rtx
force_label_rtx (tree
);
615 /* Indicate how an input argument register was promoted. */
616 extern rtx
promoted_input_arg (unsigned int, enum machine_mode
*, int *);
618 /* Return an rtx like arg but sans any constant terms.
619 Returns the original rtx if it has no constant terms.
620 The constant terms are added and stored via a second arg. */
621 extern rtx
eliminate_constant_term (rtx
, rtx
*);
623 /* Convert arg to a valid memory address for specified machine mode,
624 by emitting insns to perform arithmetic if nec. */
625 extern rtx
memory_address (enum machine_mode
, rtx
);
627 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
628 extern rtx
memory_address_noforce (enum machine_mode
, rtx
);
630 /* Set the alias set of MEM to SET. */
631 extern void set_mem_alias_set (rtx
, HOST_WIDE_INT
);
633 /* Set the alignment of MEM to ALIGN bits. */
634 extern void set_mem_align (rtx
, unsigned int);
636 /* Set the expr for MEM to EXPR. */
637 extern void set_mem_expr (rtx
, tree
);
639 /* Set the offset for MEM to OFFSET. */
640 extern void set_mem_offset (rtx
, rtx
);
642 /* Set the size for MEM to SIZE. */
643 extern void set_mem_size (rtx
, 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 /* Return a memory reference like MEMREF, but with its address changed to
680 ADDR. The caller is asserting that the actual piece of memory pointed
681 to is the same, just the form of the address is being changed, such as
682 by putting something into a register. */
683 extern rtx
replace_equiv_address (rtx
, rtx
);
685 /* Likewise, but the reference is not required to be valid. */
686 extern rtx
replace_equiv_address_nv (rtx
, rtx
);
688 /* Return a memory reference like MEMREF, but with its mode widened to
689 MODE and adjusted by OFFSET. */
690 extern rtx
widen_memory_access (rtx
, enum machine_mode
, HOST_WIDE_INT
);
692 /* Return a memory reference like MEMREF, but which is known to have a
694 extern rtx
validize_mem (rtx
);
696 /* Given REF, either a MEM or a REG, and T, either the type of X or
697 the expression corresponding to REF, set RTX_UNCHANGING_P if
699 extern void maybe_set_unchanging (rtx
, tree
);
701 /* Given REF, a MEM, and T, either the type of X or the expression
702 corresponding to REF, set the memory attributes. OBJECTP is nonzero
703 if we are making a new object of this type. */
704 extern void set_mem_attributes (rtx
, tree
, int);
706 /* Similar, except that BITPOS has not yet been applied to REF, so if
707 we alter MEM_OFFSET according to T then we should subtract BITPOS
708 expecting that it'll be added back in later. */
709 extern void set_mem_attributes_minus_bitpos (rtx
, tree
, int, HOST_WIDE_INT
);
711 /* Assemble the static constant template for function entry trampolines. */
712 extern rtx
assemble_trampoline_template (void);
714 /* Given rtx, return new rtx whose address won't be affected by
715 any side effects. It has been copied to a new temporary reg. */
716 extern rtx
stabilize (rtx
);
718 /* Given an rtx, copy all regs it refers to into new temps
719 and return a modified copy that refers to the new temps. */
720 extern rtx
copy_all_regs (rtx
);
722 /* Copy given rtx to a new temp reg and return that. */
723 extern rtx
copy_to_reg (rtx
);
725 /* Like copy_to_reg but always make the reg Pmode. */
726 extern rtx
copy_addr_to_reg (rtx
);
728 /* Like copy_to_reg but always make the reg the specified mode MODE. */
729 extern rtx
copy_to_mode_reg (enum machine_mode
, rtx
);
731 /* Copy given rtx to given temp reg and return that. */
732 extern rtx
copy_to_suggested_reg (rtx
, rtx
, enum machine_mode
);
734 /* Copy a value to a register if it isn't already a register.
735 Args are mode (in case value is a constant) and the value. */
736 extern rtx
force_reg (enum machine_mode
, rtx
);
738 /* Return given rtx, copied into a new temp reg if it was in memory. */
739 extern rtx
force_not_mem (rtx
);
741 /* Return mode and signedness to use when object is promoted. */
742 extern enum machine_mode
promote_mode (tree
, enum machine_mode
, int *, int);
744 /* Remove some bytes from the stack. An rtx says how many. */
745 extern void adjust_stack (rtx
);
747 /* Add some bytes to the stack. An rtx says how many. */
748 extern void anti_adjust_stack (rtx
);
750 /* This enum is used for the following two functions. */
751 enum save_level
{SAVE_BLOCK
, SAVE_FUNCTION
, SAVE_NONLOCAL
};
753 /* Save the stack pointer at the specified level. */
754 extern void emit_stack_save (enum save_level
, rtx
*, rtx
);
756 /* Restore the stack pointer from a save area of the specified level. */
757 extern void emit_stack_restore (enum save_level
, rtx
, rtx
);
759 /* Allocate some space on the stack dynamically and return its address. An rtx
760 says how many bytes. */
761 extern rtx
allocate_dynamic_stack_space (rtx
, rtx
, int);
763 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
764 FIRST is a constant and size is a Pmode RTX. These are offsets from the
765 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
766 subtract from the stack. If SIZE is constant, this is done
767 with a fixed number of probes. Otherwise, we must make a loop. */
768 extern void probe_stack_range (HOST_WIDE_INT
, rtx
);
770 /* Return an rtx that refers to the value returned by a library call
771 in its original home. This becomes invalid if any more code is emitted. */
772 extern rtx
hard_libcall_value (enum machine_mode
);
774 /* Given an rtx, return an rtx for a value rounded up to a multiple
775 of STACK_BOUNDARY / BITS_PER_UNIT. */
776 extern rtx
round_push (rtx
);
778 /* Return the mode desired by operand N of a particular bitfield
779 insert/extract insn, or MAX_MACHINE_MODE if no such insn is
782 enum extraction_pattern
{ EP_insv
, EP_extv
, EP_extzv
};
783 extern enum machine_mode
784 mode_for_extraction (enum extraction_pattern
, int);
786 extern rtx
store_bit_field (rtx
, unsigned HOST_WIDE_INT
,
787 unsigned HOST_WIDE_INT
, enum machine_mode
, rtx
,
789 extern rtx
extract_bit_field (rtx
, unsigned HOST_WIDE_INT
,
790 unsigned HOST_WIDE_INT
, int, rtx
,
791 enum machine_mode
, enum machine_mode
,
793 extern rtx
expand_mult (enum machine_mode
, rtx
, rtx
, rtx
, int);
794 extern bool const_mult_add_overflow_p (rtx
, rtx
, rtx
, enum machine_mode
, int);
795 extern rtx
expand_mult_add (rtx
, rtx
, rtx
, rtx
,enum machine_mode
, int);
796 extern rtx
expand_mult_highpart_adjust (enum machine_mode
, rtx
, rtx
, rtx
, rtx
, int);
798 extern rtx
assemble_static_space (unsigned HOST_WIDE_INT
);
799 extern int safe_from_p (rtx
, tree
, int);
801 /* Call this once to initialize the contents of the optabs
802 appropriately for the current target machine. */
803 extern void init_optabs (void);
804 extern void init_all_optabs (void);
806 /* Call this to initialize an optab function entry. */
807 extern rtx
init_one_libfunc (const char *);
809 extern void do_jump_by_parts_equality_rtx (rtx
, rtx
, rtx
);
810 extern void do_jump_by_parts_greater_rtx (enum machine_mode
, int, rtx
, rtx
,
813 extern void mark_seen_cases (tree
, unsigned char *, HOST_WIDE_INT
, int);
815 extern int vector_mode_valid_p (enum machine_mode
);
817 extern tree placeholder_list
;