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 movstr or libcall instead. */
88 #if defined (HAVE_movstrqi) || defined (HAVE_movstrhi) || defined (HAVE_movstrsi) || defined (HAVE_movstrdi) || defined (HAVE_movstrti)
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 clrstr or libcall instead. */
100 #if defined (HAVE_clrstrqi) || defined (HAVE_clrstrhi) || defined (HAVE_clrstrsi) || defined (HAVE_clrstrdi) || defined (HAVE_clrstrti)
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 tree
split_complex_types (tree
);
207 tree
split_complex_values (tree
);
209 /* Nonzero if we do not know how to pass TYPE solely in registers. */
210 extern bool default_must_pass_in_stack (enum machine_mode
, tree
);
211 #ifndef MUST_PASS_IN_STACK
212 #define MUST_PASS_IN_STACK(MODE,TYPE) default_must_pass_in_stack(MODE, TYPE)
215 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
216 Normally move_insn, so Pmode stack pointer. */
218 #ifndef STACK_SAVEAREA_MODE
219 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
222 /* Supply a default definition of STACK_SIZE_MODE for
223 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
225 #ifndef STACK_SIZE_MODE
226 #define STACK_SIZE_MODE word_mode
229 /* Provide default values for the macros controlling stack checking. */
231 #ifndef STACK_CHECK_BUILTIN
232 #define STACK_CHECK_BUILTIN 0
235 /* The default interval is one page. */
236 #ifndef STACK_CHECK_PROBE_INTERVAL
237 #define STACK_CHECK_PROBE_INTERVAL 4096
240 /* The default is to do a store into the stack. */
241 #ifndef STACK_CHECK_PROBE_LOAD
242 #define STACK_CHECK_PROBE_LOAD 0
245 /* This value is arbitrary, but should be sufficient for most machines. */
246 #ifndef STACK_CHECK_PROTECT
247 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
250 /* Make the maximum frame size be the largest we can and still only need
251 one probe per function. */
252 #ifndef STACK_CHECK_MAX_FRAME_SIZE
253 #define STACK_CHECK_MAX_FRAME_SIZE \
254 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
257 /* This is arbitrary, but should be large enough everywhere. */
258 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
259 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
262 /* Provide a reasonable default for the maximum size of an object to
263 allocate in the fixed frame. We may need to be able to make this
264 controllable by the user at some point. */
265 #ifndef STACK_CHECK_MAX_VAR_SIZE
266 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
269 /* Functions from optabs.c, commonly used, and without need for the optabs
272 /* Passed to expand_simple_binop and expand_binop to say which options
273 to try to use if the requested operation can't be open-coded on the
274 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
275 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
276 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
277 try anything else. */
288 /* Generate code for a simple binary or unary operation. "Simple" in
289 this case means "can be unambiguously described by a (mode, code)
290 pair and mapped to a single optab." */
291 extern rtx
expand_simple_binop (enum machine_mode
, enum rtx_code
, rtx
,
292 rtx
, rtx
, int, enum optab_methods
);
293 extern rtx
expand_simple_unop (enum machine_mode
, enum rtx_code
, rtx
, rtx
,
296 /* Report whether the machine description contains an insn which can
297 perform the operation described by CODE and MODE. */
298 extern int have_insn_for (enum rtx_code
, enum machine_mode
);
300 /* Emit code to make a call to a constant function or a library call. */
301 extern void emit_libcall_block (rtx
, rtx
, rtx
, rtx
);
303 /* Create but don't emit one rtl instruction to perform certain operations.
304 Modes must match; operands must meet the operation's predicates.
305 Likewise for subtraction and for just copying.
306 These do not call protect_from_queue; caller must do so. */
307 extern rtx
gen_add2_insn (rtx
, rtx
);
308 extern rtx
gen_add3_insn (rtx
, rtx
, rtx
);
309 extern rtx
gen_sub2_insn (rtx
, rtx
);
310 extern rtx
gen_sub3_insn (rtx
, rtx
, rtx
);
311 extern rtx
gen_move_insn (rtx
, rtx
);
312 extern int have_add2_insn (rtx
, rtx
);
313 extern int have_sub2_insn (rtx
, rtx
);
315 /* Emit a pair of rtl insns to compare two rtx's and to jump
316 to a label if the comparison is true. */
317 extern void emit_cmp_and_jump_insns (rtx
, rtx
, enum rtx_code
, rtx
,
318 enum machine_mode
, int, rtx
);
320 /* Generate code to indirectly jump to a location given in the rtx LOC. */
321 extern void emit_indirect_jump (rtx
);
323 #include "insn-config.h"
325 #ifdef HAVE_conditional_move
326 /* Emit a conditional move operation. */
327 rtx
emit_conditional_move (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
328 rtx
, rtx
, enum machine_mode
, int);
330 /* Return nonzero if the conditional move is supported. */
331 int can_conditionally_move_p (enum machine_mode mode
);
334 rtx
emit_conditional_add (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
335 rtx
, rtx
, enum machine_mode
, int);
338 /* Functions from expmed.c: */
340 /* Arguments MODE, RTX: return an rtx for the negation of that value.
342 extern rtx
negate_rtx (enum machine_mode
, rtx
);
344 /* Expand a logical AND operation. */
345 extern rtx
expand_and (enum machine_mode
, rtx
, rtx
, rtx
);
347 /* Emit a store-flag operation. */
348 extern rtx
emit_store_flag (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
351 /* Like emit_store_flag, but always succeeds. */
352 extern rtx
emit_store_flag_force (rtx
, enum rtx_code
, rtx
, rtx
,
353 enum machine_mode
, int, int);
355 /* Functions from loop.c: */
357 /* Given an insn and condition, return a canonical description of
358 the test being made. */
359 extern rtx
canonicalize_condition (rtx
, rtx
, int, rtx
*, rtx
, int);
361 /* Given a JUMP_INSN, return a canonical description of the test
363 extern rtx
get_condition (rtx
, rtx
*, int);
365 /* Generate a conditional trap instruction. */
366 extern rtx
gen_cond_trap (enum rtx_code
, rtx
, rtx
, rtx
);
368 /* Functions from builtins.c: */
369 extern rtx
expand_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
370 extern tree
std_build_builtin_va_list (void);
371 extern void std_expand_builtin_va_start (tree
, rtx
);
372 extern rtx
std_expand_builtin_va_arg (tree
, tree
);
373 extern rtx
expand_builtin_va_arg (tree
, tree
);
374 extern rtx
default_expand_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
375 extern void expand_builtin_setjmp_setup (rtx
, rtx
);
376 extern void expand_builtin_setjmp_receiver (rtx
);
377 extern void expand_builtin_longjmp (rtx
, rtx
);
378 extern rtx
expand_builtin_saveregs (void);
379 extern void expand_builtin_trap (void);
380 extern tree
simplify_builtin_fputs (tree
, int, int, tree
);
381 extern tree
simplify_builtin_strcpy (tree
, tree
);
382 extern tree
simplify_builtin_strncpy (tree
, tree
);
384 /* Functions from expr.c: */
386 /* This is run once per compilation to set up which modes can be used
387 directly in memory and to initialize the block move optab. */
388 extern void init_expr_once (void);
390 /* This is run at the start of compiling a function. */
391 extern void init_expr (void);
393 /* This is run at the end of compiling a function. */
394 extern void finish_expr_for_function (void);
396 /* Use protect_from_queue to convert a QUEUED expression
397 into something that you can put immediately into an instruction. */
398 extern rtx
protect_from_queue (rtx
, int);
400 /* Perform all the pending incrementations. */
401 extern void emit_queue (void);
403 /* Tell if something has a queued subexpression. */
404 extern int queued_subexp_p (rtx
);
406 /* Emit some rtl insns to move data between rtx's, converting machine modes.
407 Both modes must be floating or both fixed. */
408 extern void convert_move (rtx
, rtx
, int);
410 /* Convert an rtx to specified machine mode and return the result. */
411 extern rtx
convert_to_mode (enum machine_mode
, rtx
, int);
413 /* Convert an rtx to MODE from OLDMODE and return the result. */
414 extern rtx
convert_modes (enum machine_mode
, enum machine_mode
, rtx
, int);
416 /* Emit code to move a block Y to a block X. */
418 enum block_op_methods
425 extern void init_block_move_fn (const char *);
426 extern void init_block_clear_fn (const char *);
428 extern rtx
emit_block_move (rtx
, rtx
, rtx
, enum block_op_methods
);
430 /* Copy all or part of a value X into registers starting at REGNO.
431 The number of registers to be filled is NREGS. */
432 extern void move_block_to_reg (int, rtx
, int, enum machine_mode
);
434 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
435 The number of registers to be filled is NREGS. */
436 extern void move_block_from_reg (int, rtx
, int);
438 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
439 extern rtx
gen_group_rtx (rtx
);
441 /* Load a BLKmode value into non-consecutive registers represented by a
443 extern void emit_group_load (rtx
, rtx
, tree
, int);
445 /* Move a non-consecutive group of registers represented by a PARALLEL into
446 a non-consecutive group of registers represented by a PARALLEL. */
447 extern void emit_group_move (rtx
, rtx
);
449 /* Store a BLKmode value from non-consecutive registers represented by a
451 extern void emit_group_store (rtx
, rtx
, tree
, int);
453 /* Copy BLKmode object from a set of registers. */
454 extern rtx
copy_blkmode_from_reg (rtx
, rtx
, tree
);
456 /* Mark REG as holding a parameter for the next CALL_INSN. */
457 extern void use_reg (rtx
*, rtx
);
459 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
460 for the next CALL_INSN. */
461 extern void use_regs (rtx
*, int, int);
463 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
464 extern void use_group_regs (rtx
*, rtx
);
466 /* Write zeros through the storage of OBJECT.
467 If OBJECT has BLKmode, SIZE is its length in bytes. */
468 extern rtx
clear_storage (rtx
, rtx
);
470 /* Determine whether the LEN bytes can be moved by using several move
471 instructions. Return nonzero if a call to move_by_pieces should
473 extern int can_move_by_pieces (unsigned HOST_WIDE_INT
, unsigned int);
475 /* Return nonzero if it is desirable to store LEN bytes generated by
476 CONSTFUN with several move instructions by store_by_pieces
477 function. CONSTFUNDATA is a pointer which will be passed as argument
478 in every CONSTFUN call.
479 ALIGN is maximum alignment we can assume. */
480 extern int can_store_by_pieces (unsigned HOST_WIDE_INT
,
481 rtx (*) (void *, HOST_WIDE_INT
,
483 void *, unsigned int);
485 /* Generate several move instructions to store LEN bytes generated by
486 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
487 pointer which will be passed as argument in every CONSTFUN call.
488 ALIGN is maximum alignment we can assume.
490 extern rtx
store_by_pieces (rtx
, unsigned HOST_WIDE_INT
,
491 rtx (*) (void *, HOST_WIDE_INT
, enum machine_mode
),
492 void *, unsigned int, int);
494 /* Emit insns to set X from Y. */
495 extern rtx
emit_move_insn (rtx
, rtx
);
497 /* Emit insns to set X from Y, with no frills. */
498 extern rtx
emit_move_insn_1 (rtx
, rtx
);
500 /* Push a block of length SIZE (perhaps variable)
501 and return an rtx to address the beginning of the block. */
502 extern rtx
push_block (rtx
, int, int);
504 /* Generate code to push something onto the stack, given its mode and type. */
505 extern void emit_push_insn (rtx
, enum machine_mode
, tree
, rtx
, unsigned int,
506 int, rtx
, int, rtx
, rtx
, int, rtx
);
508 /* Expand an assignment that stores the value of FROM into TO. */
509 extern rtx
expand_assignment (tree
, tree
, int);
511 /* Generate code for computing expression EXP,
512 and storing the value into TARGET.
513 If SUGGEST_REG is nonzero, copy the value through a register
514 and return that register, if that is possible. */
515 extern rtx
store_expr (tree
, rtx
, int);
517 /* Given an rtx that may include add and multiply operations,
518 generate them as insns and return a pseudo-reg containing the value.
519 Useful after calling expand_expr with 1 as sum_ok. */
520 extern rtx
force_operand (rtx
, rtx
);
522 /* Work horse for expand_expr. */
523 extern rtx
expand_expr_real (tree
, rtx
, enum machine_mode
,
524 enum expand_modifier
, rtx
*);
526 /* Generate code for computing expression EXP.
527 An rtx for the computed value is returned. The value is never null.
528 In the case of a void EXP, const0_rtx is returned. */
530 expand_expr (tree exp
, rtx target
, enum machine_mode mode
,
531 enum expand_modifier modifier
)
533 return expand_expr_real (exp
, target
, mode
, modifier
, NULL
);
536 extern void expand_var (tree
);
538 /* At the start of a function, record that we have no previously-pushed
539 arguments waiting to be popped. */
540 extern void init_pending_stack_adjust (void);
542 /* When exiting from function, if safe, clear out any pending stack adjust
543 so the adjustment won't get done. */
544 extern void clear_pending_stack_adjust (void);
546 /* Pop any previously-pushed arguments that have not been popped yet. */
547 extern void do_pending_stack_adjust (void);
549 /* Return the tree node and offset if a given argument corresponds to
550 a string constant. */
551 extern tree
string_constant (tree
, tree
*);
553 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
554 extern void jumpifnot (tree
, rtx
);
556 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
557 extern void jumpif (tree
, rtx
);
559 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
560 the result is zero, or IF_TRUE_LABEL if the result is one. */
561 extern void do_jump (tree
, rtx
, rtx
);
563 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
564 extern rtx
compare_from_rtx (rtx
, rtx
, enum rtx_code
, int, enum machine_mode
,
566 extern void do_compare_rtx_and_jump (rtx
, rtx
, enum rtx_code
, int,
567 enum machine_mode
, rtx
, rtx
, rtx
);
569 /* Two different ways of generating switch statements. */
570 extern int try_casesi (tree
, tree
, tree
, tree
, rtx
, rtx
);
571 extern int try_tablejump (tree
, tree
, tree
, tree
, rtx
, rtx
);
573 /* Smallest number of adjacent cases before we use a jump table.
574 XXX Should be a target hook. */
575 extern unsigned int case_values_threshold (void);
577 /* Functions from alias.c */
579 /* extern HOST_WIDE_INT get_varargs_alias_set (void); */
580 /* extern HOST_WIDE_INT get_frame_alias_set (void); */
581 /* extern void record_base_value (unsigned int, rtx, int); */
582 /* extern void record_alias_subset (HOST_WIDE_INT, HOST_WIDE_INT); */
583 /* extern HOST_WIDE_INT new_alias_set (void); */
584 /* extern int can_address_p (tree); */
587 /* rtl.h and tree.h were included. */
588 /* Return an rtx for the size in bytes of the value of an expr. */
589 extern rtx
expr_size (tree
);
591 /* Return a wide integer for the size in bytes of the value of EXP, or -1
592 if the size can vary or is larger than an integer. */
593 extern HOST_WIDE_INT
int_expr_size (tree
);
595 /* Convert a stack slot address ADDR valid in function FNDECL
596 into an address valid in this function (using a static chain). */
597 extern rtx
fix_lexical_addr (rtx
, tree
);
599 /* Return the address of the trampoline for entering nested fn FUNCTION. */
600 extern rtx
trampoline_address (tree
);
602 /* Return an rtx that refers to the value returned by a function
603 in its original home. This becomes invalid if any more code is emitted. */
604 extern rtx
hard_function_value (tree
, tree
, int);
606 extern rtx
prepare_call_address (rtx
, rtx
, rtx
*, int, int);
608 extern rtx
expand_call (tree
, rtx
, int);
610 extern void fixup_tail_calls (void);
613 extern rtx
expand_shift (enum tree_code
, enum machine_mode
, rtx
, tree
, rtx
,
615 extern rtx
expand_divmod (int, enum tree_code
, enum machine_mode
, rtx
, rtx
,
619 extern void locate_and_pad_parm (enum machine_mode
, tree
, int, int, tree
,
621 struct locate_and_pad_arg_data
*);
623 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
624 extern rtx
label_rtx (tree
);
626 /* As label_rtx, but additionally the label is placed on the forced label
627 list of its containing function (i.e. it is treated as reachable even
628 if how is not obvious). */
629 extern rtx
force_label_rtx (tree
);
631 /* Indicate how an input argument register was promoted. */
632 extern rtx
promoted_input_arg (unsigned int, enum machine_mode
*, int *);
634 /* Return an rtx like arg but sans any constant terms.
635 Returns the original rtx if it has no constant terms.
636 The constant terms are added and stored via a second arg. */
637 extern rtx
eliminate_constant_term (rtx
, rtx
*);
639 /* Convert arg to a valid memory address for specified machine mode,
640 by emitting insns to perform arithmetic if nec. */
641 extern rtx
memory_address (enum machine_mode
, rtx
);
643 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
644 extern rtx
memory_address_noforce (enum machine_mode
, rtx
);
646 /* Return a memory reference like MEMREF, but with its mode changed
647 to MODE and its address changed to ADDR.
648 (VOIDmode means don't change the mode.
649 NULL for ADDR means don't change the address.) */
650 extern rtx
change_address (rtx
, enum machine_mode
, rtx
);
652 /* Return a memory reference like MEMREF, but with its mode changed
653 to MODE and its address offset by OFFSET bytes. */
654 #define adjust_address(MEMREF, MODE, OFFSET) \
655 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
657 /* Likewise, but the reference is not required to be valid. */
658 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
659 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
661 /* Return a memory reference like MEMREF, but with its mode changed
662 to MODE and its address changed to ADDR, which is assumed to be
663 increased by OFFSET bytes from MEMREF. */
664 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
665 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
667 /* Likewise, but the reference is not required to be valid. */
668 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
669 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
671 extern rtx
adjust_address_1 (rtx
, enum machine_mode
, HOST_WIDE_INT
, int, int);
672 extern rtx
adjust_automodify_address_1 (rtx
, enum machine_mode
, rtx
,
675 /* Return a memory reference like MEMREF, but whose address is changed by
676 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
677 known to be in OFFSET (possibly 1). */
678 extern rtx
offset_address (rtx
, rtx
, unsigned HOST_WIDE_INT
);
680 /* Definitions from emit-rtl.c */
681 #include "emit-rtl.h"
683 /* Return a memory reference like MEMREF, but with its mode widened to
684 MODE and adjusted by OFFSET. */
685 extern rtx
widen_memory_access (rtx
, enum machine_mode
, HOST_WIDE_INT
);
687 /* Return a memory reference like MEMREF, but which is known to have a
689 extern rtx
validize_mem (rtx
);
691 /* Given REF, either a MEM or a REG, and T, either the type of X or
692 the expression corresponding to REF, set RTX_UNCHANGING_P if
694 extern void maybe_set_unchanging (rtx
, tree
);
696 /* Given REF, a MEM, and T, either the type of X or the expression
697 corresponding to REF, set the memory attributes. OBJECTP is nonzero
698 if we are making a new object of this type. */
699 extern void set_mem_attributes (rtx
, tree
, int);
701 /* Similar, except that BITPOS has not yet been applied to REF, so if
702 we alter MEM_OFFSET according to T then we should subtract BITPOS
703 expecting that it'll be added back in later. */
704 extern void set_mem_attributes_minus_bitpos (rtx
, tree
, int, HOST_WIDE_INT
);
706 /* Assemble the static constant template for function entry trampolines. */
707 extern rtx
assemble_trampoline_template (void);
709 /* Given rtx, return new rtx whose address won't be affected by
710 any side effects. It has been copied to a new temporary reg. */
711 extern rtx
stabilize (rtx
);
713 /* Given an rtx, copy all regs it refers to into new temps
714 and return a modified copy that refers to the new temps. */
715 extern rtx
copy_all_regs (rtx
);
717 /* Copy given rtx to a new temp reg and return that. */
718 extern rtx
copy_to_reg (rtx
);
720 /* Like copy_to_reg but always make the reg Pmode. */
721 extern rtx
copy_addr_to_reg (rtx
);
723 /* Like copy_to_reg but always make the reg the specified mode MODE. */
724 extern rtx
copy_to_mode_reg (enum machine_mode
, rtx
);
726 /* Copy given rtx to given temp reg and return that. */
727 extern rtx
copy_to_suggested_reg (rtx
, rtx
, enum machine_mode
);
729 /* Copy a value to a register if it isn't already a register.
730 Args are mode (in case value is a constant) and the value. */
731 extern rtx
force_reg (enum machine_mode
, rtx
);
733 /* Return given rtx, copied into a new temp reg if it was in memory. */
734 extern rtx
force_not_mem (rtx
);
736 /* Return mode and signedness to use when object is promoted. */
737 extern enum machine_mode
promote_mode (tree
, enum machine_mode
, int *, int);
739 /* Remove some bytes from the stack. An rtx says how many. */
740 extern void adjust_stack (rtx
);
742 /* Add some bytes to the stack. An rtx says how many. */
743 extern void anti_adjust_stack (rtx
);
745 /* This enum is used for the following two functions. */
746 enum save_level
{SAVE_BLOCK
, SAVE_FUNCTION
, SAVE_NONLOCAL
};
748 /* Save the stack pointer at the specified level. */
749 extern void emit_stack_save (enum save_level
, rtx
*, rtx
);
751 /* Restore the stack pointer from a save area of the specified level. */
752 extern void emit_stack_restore (enum save_level
, rtx
, rtx
);
754 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */
755 extern void update_nonlocal_goto_save_area (void);
757 /* Allocate some space on the stack dynamically and return its address. An rtx
758 says how many bytes. */
759 extern rtx
allocate_dynamic_stack_space (rtx
, rtx
, int);
761 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
762 FIRST is a constant and size is a Pmode RTX. These are offsets from the
763 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
764 subtract from the stack. If SIZE is constant, this is done
765 with a fixed number of probes. Otherwise, we must make a loop. */
766 extern void probe_stack_range (HOST_WIDE_INT
, rtx
);
768 /* Return an rtx that refers to the value returned by a library call
769 in its original home. This becomes invalid if any more code is emitted. */
770 extern rtx
hard_libcall_value (enum machine_mode
);
772 /* Given an rtx, return an rtx for a value rounded up to a multiple
773 of STACK_BOUNDARY / BITS_PER_UNIT. */
774 extern rtx
round_push (rtx
);
776 /* Return the mode desired by operand N of a particular bitfield
777 insert/extract insn, or MAX_MACHINE_MODE if no such insn is
780 enum extraction_pattern
{ EP_insv
, EP_extv
, EP_extzv
};
781 extern enum machine_mode
782 mode_for_extraction (enum extraction_pattern
, int);
784 extern rtx
store_bit_field (rtx
, unsigned HOST_WIDE_INT
,
785 unsigned HOST_WIDE_INT
, enum machine_mode
, rtx
,
787 extern rtx
extract_bit_field (rtx
, unsigned HOST_WIDE_INT
,
788 unsigned HOST_WIDE_INT
, int, rtx
,
789 enum machine_mode
, enum machine_mode
,
791 extern rtx
expand_mult (enum machine_mode
, rtx
, rtx
, rtx
, int);
792 extern bool const_mult_add_overflow_p (rtx
, rtx
, rtx
, enum machine_mode
, int);
793 extern rtx
expand_mult_add (rtx
, rtx
, rtx
, rtx
,enum machine_mode
, int);
794 extern rtx
expand_mult_highpart_adjust (enum machine_mode
, rtx
, rtx
, rtx
, rtx
, int);
796 extern rtx
assemble_static_space (unsigned HOST_WIDE_INT
);
797 extern int safe_from_p (rtx
, tree
, int);
799 /* Call this once to initialize the contents of the optabs
800 appropriately for the current target machine. */
801 extern void init_optabs (void);
802 extern void init_all_optabs (void);
804 /* Call this to initialize an optab function entry. */
805 extern rtx
init_one_libfunc (const char *);
807 extern void do_jump_by_parts_equality_rtx (rtx
, rtx
, rtx
);
808 extern void do_jump_by_parts_greater_rtx (enum machine_mode
, int, rtx
, rtx
,
811 extern int vector_mode_valid_p (enum machine_mode
);
813 #endif /* GCC_EXPR_H */