1 /* Definitions for code generation pass of GNU compiler.
2 Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
25 /* For inhibit_defer_pop */
27 /* For XEXP, GEN_INT, rtx_code */
29 /* For optimize_size */
31 /* For host_integerp, tree_low_cst, fold_convert, size_binop, ssize_int,
32 TREE_CODE, TYPE_SIZE, int_size_in_bytes, */
34 /* For GET_MODE_BITSIZE, word_mode */
37 /* The default branch cost is 1. */
39 #define BRANCH_COST(speed_p, predictable_p) 1
42 /* This is the 4th arg to `expand_expr'.
43 EXPAND_STACK_PARM means we are possibly expanding a call param onto
45 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
46 EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
47 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
48 is a constant that is not a legitimate address.
49 EXPAND_WRITE means we are only going to write to the resulting rtx.
50 EXPAND_MEMORY means we are interested in a memory result, even if
51 the memory is constant and we could have propagated a constant value. */
52 enum expand_modifier
{EXPAND_NORMAL
= 0, EXPAND_STACK_PARM
, EXPAND_SUM
,
53 EXPAND_CONST_ADDRESS
, EXPAND_INITIALIZER
, EXPAND_WRITE
,
56 /* Prevent the compiler from deferring stack pops. See
57 inhibit_defer_pop for more information. */
58 #define NO_DEFER_POP (inhibit_defer_pop += 1)
60 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for
62 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
64 /* If a memory-to-memory move would take MOVE_RATIO or more simple
65 move-instruction sequences, we will do a movmem or libcall instead. */
68 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
69 #define MOVE_RATIO(speed) 2
71 /* If we are optimizing for space (-Os), cut down the default move ratio. */
72 #define MOVE_RATIO(speed) ((speed) ? 15 : 3)
76 /* If a clear memory operation would take CLEAR_RATIO or more simple
77 move-instruction sequences, we will do a setmem or libcall instead. */
80 #if defined (HAVE_setmemqi) || defined (HAVE_setmemhi) || defined (HAVE_setmemsi) || defined (HAVE_setmemdi) || defined (HAVE_setmemti)
81 #define CLEAR_RATIO(speed) 2
83 /* If we are optimizing for space, cut down the default clear ratio. */
84 #define CLEAR_RATIO(speed) ((speed) ? 15 :3)
88 /* If a memory set (to value other than zero) operation would take
89 SET_RATIO or more simple move-instruction sequences, we will do a movmem
90 or libcall instead. */
92 #define SET_RATIO(speed) MOVE_RATIO(speed)
95 enum direction
{none
, upward
, downward
};
97 /* Structure to record the size of a sequence of arguments
98 as the sum of a tree-expression and a constant. This structure is
99 also used to store offsets from the stack, which might be negative,
100 so the variable part must be ssizetype, not sizetype. */
104 HOST_WIDE_INT constant
;
108 /* Package up various arg related fields of struct args for
109 locate_and_pad_parm. */
110 struct locate_and_pad_arg_data
112 /* Size of this argument on the stack, rounded up for any padding it
113 gets. If REG_PARM_STACK_SPACE is defined, then register parms are
114 counted here, otherwise they aren't. */
115 struct args_size size
;
116 /* Offset of this argument from beginning of stack-args. */
117 struct args_size offset
;
118 /* Offset to the start of the stack slot. Different from OFFSET
119 if this arg pads downward. */
120 struct args_size slot_offset
;
121 /* The amount that the stack pointer needs to be adjusted to
122 force alignment for the next argument. */
123 struct args_size alignment_pad
;
124 /* Which way we should pad this arg. */
125 enum direction where_pad
;
126 /* slot_offset is at least this aligned. */
127 unsigned int boundary
;
130 /* Add the value of the tree INC to the `struct args_size' TO. */
132 #define ADD_PARM_SIZE(TO, INC) \
135 if (host_integerp (inc, 0)) \
136 (TO).constant += tree_low_cst (inc, 0); \
137 else if ((TO).var == 0) \
138 (TO).var = fold_convert (ssizetype, inc); \
140 (TO).var = size_binop (PLUS_EXPR, (TO).var, \
141 fold_convert (ssizetype, inc)); \
144 #define SUB_PARM_SIZE(TO, DEC) \
147 if (host_integerp (dec, 0)) \
148 (TO).constant -= tree_low_cst (dec, 0); \
149 else if ((TO).var == 0) \
150 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \
151 fold_convert (ssizetype, dec)); \
153 (TO).var = size_binop (MINUS_EXPR, (TO).var, \
154 fold_convert (ssizetype, dec)); \
157 /* Convert the implicit sum in a `struct args_size' into a tree
158 of type ssizetype. */
159 #define ARGS_SIZE_TREE(SIZE) \
160 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \
161 : size_binop (PLUS_EXPR, fold_convert (ssizetype, (SIZE).var), \
162 ssize_int ((SIZE).constant)))
164 /* Convert the implicit sum in a `struct args_size' into an rtx. */
165 #define ARGS_SIZE_RTX(SIZE) \
166 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
167 : expand_normal (ARGS_SIZE_TREE (SIZE)))
169 /* Supply a default definition for FUNCTION_ARG_PADDING:
170 usually pad upward, but pad short args downward on
171 big-endian machines. */
173 #define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE) \
174 (! BYTES_BIG_ENDIAN \
176 : (((MODE) == BLKmode \
177 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
178 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
179 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
180 ? downward : upward))
182 #ifndef FUNCTION_ARG_PADDING
183 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
184 DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE))
187 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
188 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
191 #ifndef FUNCTION_ARG_BOUNDARY
192 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
195 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
196 Normally move_insn, so Pmode stack pointer. */
198 #ifndef STACK_SAVEAREA_MODE
199 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
202 /* Supply a default definition of STACK_SIZE_MODE for
203 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
205 #ifndef STACK_SIZE_MODE
206 #define STACK_SIZE_MODE word_mode
209 /* Provide default values for the macros controlling stack checking. */
211 /* The default is neither full builtin stack checking... */
212 #ifndef STACK_CHECK_BUILTIN
213 #define STACK_CHECK_BUILTIN 0
216 /* ...nor static builtin stack checking. */
217 #ifndef STACK_CHECK_STATIC_BUILTIN
218 #define STACK_CHECK_STATIC_BUILTIN 0
221 /* The default interval is one page. */
222 #ifndef STACK_CHECK_PROBE_INTERVAL
223 #define STACK_CHECK_PROBE_INTERVAL 4096
226 /* The default is to do a store into the stack. */
227 #ifndef STACK_CHECK_PROBE_LOAD
228 #define STACK_CHECK_PROBE_LOAD 0
231 /* This is a kludge to try to capture the discrepancy between the old
232 mechanism (generic stack checking) and the new mechanism (static
233 builtin stack checking). STACK_CHECK_PROTECT needs to be bumped
234 for the latter because part of the protection area is effectively
235 included in STACK_CHECK_MAX_FRAME_SIZE for the former. */
236 #ifdef STACK_CHECK_PROTECT
237 #define STACK_OLD_CHECK_PROTECT STACK_CHECK_PROTECT
239 #define STACK_OLD_CHECK_PROTECT \
240 (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 8 * 1024)
243 /* Minimum amount of stack required to recover from an anticipated stack
244 overflow detection. The default value conveys an estimate of the amount
245 of stack required to propagate an exception. */
246 #ifndef STACK_CHECK_PROTECT
247 #define STACK_CHECK_PROTECT \
248 (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 12 * 1024)
251 /* Make the maximum frame size be the largest we can and still only need
252 one probe per function. */
253 #ifndef STACK_CHECK_MAX_FRAME_SIZE
254 #define STACK_CHECK_MAX_FRAME_SIZE \
255 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
258 /* This is arbitrary, but should be large enough everywhere. */
259 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
260 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
263 /* Provide a reasonable default for the maximum size of an object to
264 allocate in the fixed frame. We may need to be able to make this
265 controllable by the user at some point. */
266 #ifndef STACK_CHECK_MAX_VAR_SIZE
267 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
270 /* This structure is used to pass around information about exploded
271 unary, binary and trinary expressions between expand_expr_real_1 and
273 typedef struct separate_ops
281 /* Functions from optabs.c, commonly used, and without need for the optabs
284 /* Passed to expand_simple_binop and expand_binop to say which options
285 to try to use if the requested operation can't be open-coded on the
286 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
287 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
288 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
289 try anything else. */
300 /* Generate code for a simple binary or unary operation. "Simple" in
301 this case means "can be unambiguously described by a (mode, code)
302 pair and mapped to a single optab." */
303 extern rtx
expand_simple_binop (enum machine_mode
, enum rtx_code
, rtx
,
304 rtx
, rtx
, int, enum optab_methods
);
305 extern rtx
expand_simple_unop (enum machine_mode
, enum rtx_code
, rtx
, rtx
,
308 /* Report whether the machine description contains an insn which can
309 perform the operation described by CODE and MODE. */
310 extern int have_insn_for (enum rtx_code
, enum machine_mode
);
312 extern rtx
prepare_operand (int, rtx
, int, enum machine_mode
, enum machine_mode
,
315 /* Emit code to make a call to a constant function or a library call. */
316 extern void emit_libcall_block (rtx
, rtx
, rtx
, rtx
);
318 /* Create but don't emit one rtl instruction to perform certain operations.
319 Modes must match; operands must meet the operation's predicates.
320 Likewise for subtraction and for just copying. */
321 extern rtx
gen_add2_insn (rtx
, rtx
);
322 extern rtx
gen_add3_insn (rtx
, rtx
, rtx
);
323 extern rtx
gen_sub2_insn (rtx
, rtx
);
324 extern rtx
gen_sub3_insn (rtx
, rtx
, rtx
);
325 extern rtx
gen_move_insn (rtx
, rtx
);
326 extern int have_add2_insn (rtx
, rtx
);
327 extern int have_sub2_insn (rtx
, rtx
);
329 /* Emit a pair of rtl insns to compare two rtx's and to jump
330 to a label if the comparison is true. */
331 extern void emit_cmp_and_jump_insns (rtx
, rtx
, enum rtx_code
, rtx
,
332 enum machine_mode
, int, rtx
);
334 /* Generate code to indirectly jump to a location given in the rtx LOC. */
335 extern void emit_indirect_jump (rtx
);
337 /* Generate a conditional trap instruction. */
338 extern rtx
gen_cond_trap (enum rtx_code
, rtx
, rtx
, rtx
);
340 #include "insn-config.h"
342 #ifdef HAVE_conditional_move
343 /* Emit a conditional move operation. */
344 rtx
emit_conditional_move (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
345 rtx
, rtx
, enum machine_mode
, int);
347 /* Return nonzero if the conditional move is supported. */
348 int can_conditionally_move_p (enum machine_mode mode
);
351 rtx
emit_conditional_add (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
352 rtx
, rtx
, enum machine_mode
, int);
354 rtx
expand_val_compare_and_swap (rtx
, rtx
, rtx
, rtx
);
355 rtx
expand_bool_compare_and_swap (rtx
, rtx
, rtx
, rtx
);
356 rtx
expand_sync_operation (rtx
, rtx
, enum rtx_code
);
357 rtx
expand_sync_fetch_operation (rtx
, rtx
, enum rtx_code
, bool, rtx
);
358 rtx
expand_sync_lock_test_and_set (rtx
, rtx
, rtx
);
360 /* Functions from expmed.c: */
362 /* Arguments MODE, RTX: return an rtx for the negation of that value.
364 extern rtx
negate_rtx (enum machine_mode
, rtx
);
366 /* Expand a logical AND operation. */
367 extern rtx
expand_and (enum machine_mode
, rtx
, rtx
, rtx
);
369 /* Emit a store-flag operation. */
370 extern rtx
emit_store_flag (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
373 /* Like emit_store_flag, but always succeeds. */
374 extern rtx
emit_store_flag_force (rtx
, enum rtx_code
, rtx
, rtx
,
375 enum machine_mode
, int, int);
377 /* Functions from builtins.c: */
378 extern rtx
expand_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
379 extern tree
std_build_builtin_va_list (void);
380 extern tree
std_fn_abi_va_list (tree
);
381 extern tree
std_canonical_va_list_type (tree
);
383 extern void std_expand_builtin_va_start (tree
, rtx
);
384 extern rtx
default_expand_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
385 extern void expand_builtin_setjmp_setup (rtx
, rtx
);
386 extern void expand_builtin_setjmp_receiver (rtx
);
387 extern rtx
expand_builtin_saveregs (void);
388 extern void expand_builtin_trap (void);
389 extern rtx
builtin_strncpy_read_str (void *, HOST_WIDE_INT
, enum machine_mode
);
391 /* Functions from expr.c: */
393 /* This is run during target initialization to set up which modes can be
394 used directly in memory and to initialize the block move optab. */
395 extern void init_expr_target (void);
397 /* This is run at the start of compiling a function. */
398 extern void init_expr (void);
400 /* Emit some rtl insns to move data between rtx's, converting machine modes.
401 Both modes must be floating or both fixed. */
402 extern void convert_move (rtx
, rtx
, int);
404 /* Convert an rtx to specified machine mode and return the result. */
405 extern rtx
convert_to_mode (enum machine_mode
, rtx
, int);
407 /* Convert an rtx to MODE from OLDMODE and return the result. */
408 extern rtx
convert_modes (enum machine_mode
, enum machine_mode
, rtx
, int);
410 /* Emit code to move a block Y to a block X. */
412 enum block_op_methods
417 /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */
421 extern GTY(()) tree block_clear_fn
;
422 extern void init_block_move_fn (const char *);
423 extern void init_block_clear_fn (const char *);
425 extern rtx
emit_block_move (rtx
, rtx
, rtx
, enum block_op_methods
);
426 extern rtx
emit_block_move_via_libcall (rtx
, rtx
, rtx
, bool);
427 extern rtx
emit_block_move_hints (rtx
, rtx
, rtx
, enum block_op_methods
,
428 unsigned int, HOST_WIDE_INT
);
429 extern bool emit_storent_insn (rtx to
, rtx from
);
431 /* Copy all or part of a value X into registers starting at REGNO.
432 The number of registers to be filled is NREGS. */
433 extern void move_block_to_reg (int, rtx
, int, enum machine_mode
);
435 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
436 The number of registers to be filled is NREGS. */
437 extern void move_block_from_reg (int, rtx
, int);
439 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
440 extern rtx
gen_group_rtx (rtx
);
442 /* Load a BLKmode value into non-consecutive registers represented by a
444 extern void emit_group_load (rtx
, rtx
, tree
, int);
446 /* Similarly, but load into new temporaries. */
447 extern rtx
emit_group_load_into_temps (rtx
, rtx
, tree
, int);
449 /* Move a non-consecutive group of registers represented by a PARALLEL into
450 a non-consecutive group of registers represented by a PARALLEL. */
451 extern void emit_group_move (rtx
, rtx
);
453 /* Move a group of registers represented by a PARALLEL into pseudos. */
454 extern rtx
emit_group_move_into_temps (rtx
);
456 /* Store a BLKmode value from non-consecutive registers represented by a
458 extern void emit_group_store (rtx
, rtx
, tree
, int);
460 /* Copy BLKmode object from a set of registers. */
461 extern rtx
copy_blkmode_from_reg (rtx
, rtx
, tree
);
463 /* Mark REG as holding a parameter for the next CALL_INSN. */
464 extern void use_reg (rtx
*, rtx
);
466 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
467 for the next CALL_INSN. */
468 extern void use_regs (rtx
*, int, int);
470 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
471 extern void use_group_regs (rtx
*, rtx
);
473 /* Write zeros through the storage of OBJECT.
474 If OBJECT has BLKmode, SIZE is its length in bytes. */
475 extern rtx
clear_storage (rtx
, rtx
, enum block_op_methods
);
476 extern rtx
clear_storage_hints (rtx
, rtx
, enum block_op_methods
,
477 unsigned int, HOST_WIDE_INT
);
478 /* The same, but always output an library call. */
479 rtx
set_storage_via_libcall (rtx
, rtx
, rtx
, bool);
481 /* Expand a setmem pattern; return true if successful. */
482 extern bool set_storage_via_setmem (rtx
, rtx
, rtx
, unsigned int,
483 unsigned int, HOST_WIDE_INT
);
485 /* Determine whether the LEN bytes can be moved by using several move
486 instructions. Return nonzero if a call to move_by_pieces should
488 extern int can_move_by_pieces (unsigned HOST_WIDE_INT
, unsigned int);
490 /* Return nonzero if it is desirable to store LEN bytes generated by
491 CONSTFUN with several move instructions by store_by_pieces
492 function. CONSTFUNDATA is a pointer which will be passed as argument
493 in every CONSTFUN call.
494 ALIGN is maximum alignment we can assume.
495 MEMSETP is true if this is a real memset/bzero, not a copy
496 of a const string. */
497 extern int can_store_by_pieces (unsigned HOST_WIDE_INT
,
498 rtx (*) (void *, HOST_WIDE_INT
,
500 void *, unsigned int, bool);
502 /* Generate several move instructions to store LEN bytes generated by
503 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
504 pointer which will be passed as argument in every CONSTFUN call.
505 ALIGN is maximum alignment we can assume.
506 MEMSETP is true if this is a real memset/bzero, not a copy.
508 extern rtx
store_by_pieces (rtx
, unsigned HOST_WIDE_INT
,
509 rtx (*) (void *, HOST_WIDE_INT
, enum machine_mode
),
510 void *, unsigned int, bool, int);
512 /* Emit insns to set X from Y. */
513 extern rtx
emit_move_insn (rtx
, rtx
);
515 /* Emit insns to set X from Y, with no frills. */
516 extern rtx
emit_move_insn_1 (rtx
, rtx
);
518 extern rtx
emit_move_complex_push (enum machine_mode
, rtx
, rtx
);
519 extern rtx
emit_move_complex_parts (rtx
, rtx
);
521 /* Push a block of length SIZE (perhaps variable)
522 and return an rtx to address the beginning of the block. */
523 extern rtx
push_block (rtx
, int, int);
525 /* Generate code to push something onto the stack, given its mode and type. */
526 extern void emit_push_insn (rtx
, enum machine_mode
, tree
, rtx
, unsigned int,
527 int, rtx
, int, rtx
, rtx
, int, rtx
);
529 /* Expand an assignment that stores the value of FROM into TO. */
530 extern void expand_assignment (tree
, tree
, bool);
532 /* Generate code for computing expression EXP,
533 and storing the value into TARGET.
534 If SUGGEST_REG is nonzero, copy the value through a register
535 and return that register, if that is possible. */
536 extern rtx
store_expr (tree
, rtx
, int, bool);
538 /* Given an rtx that may include add and multiply operations,
539 generate them as insns and return a pseudo-reg containing the value.
540 Useful after calling expand_expr with 1 as sum_ok. */
541 extern rtx
force_operand (rtx
, rtx
);
543 /* Work horses for expand_expr. */
544 extern rtx
expand_expr_real (tree
, rtx
, enum machine_mode
,
545 enum expand_modifier
, rtx
*);
546 extern rtx
expand_expr_real_1 (tree
, rtx
, enum machine_mode
,
547 enum expand_modifier
, rtx
*);
548 extern rtx
expand_expr_real_2 (sepops
, rtx
, enum machine_mode
,
549 enum expand_modifier
);
551 /* Generate code for computing expression EXP.
552 An rtx for the computed value is returned. The value is never null.
553 In the case of a void EXP, const0_rtx is returned. */
555 expand_expr (tree exp
, rtx target
, enum machine_mode mode
,
556 enum expand_modifier modifier
)
558 return expand_expr_real (exp
, target
, mode
, modifier
, NULL
);
562 expand_normal (tree exp
)
564 return expand_expr_real (exp
, NULL_RTX
, VOIDmode
, EXPAND_NORMAL
, NULL
);
567 /* At the start of a function, record that we have no previously-pushed
568 arguments waiting to be popped. */
569 extern void init_pending_stack_adjust (void);
571 /* Discard any pending stack adjustment. */
572 extern void discard_pending_stack_adjust (void);
574 /* When exiting from function, if safe, clear out any pending stack adjust
575 so the adjustment won't get done. */
576 extern void clear_pending_stack_adjust (void);
578 /* Pop any previously-pushed arguments that have not been popped yet. */
579 extern void do_pending_stack_adjust (void);
581 /* Return the tree node and offset if a given argument corresponds to
582 a string constant. */
583 extern tree
string_constant (tree
, tree
*);
585 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
586 extern void jumpifnot (tree
, rtx
);
587 extern void jumpifnot_1 (enum tree_code
, tree
, tree
, rtx
);
589 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
590 extern void jumpif (tree
, rtx
);
591 extern void jumpif_1 (enum tree_code
, tree
, tree
, rtx
);
593 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
594 the result is zero, or IF_TRUE_LABEL if the result is one. */
595 extern void do_jump (tree
, rtx
, rtx
);
596 extern void do_jump_1 (enum tree_code
, tree
, tree
, rtx
, rtx
);
598 extern void do_compare_rtx_and_jump (rtx
, rtx
, enum rtx_code
, int,
599 enum machine_mode
, rtx
, rtx
, rtx
);
601 /* Two different ways of generating switch statements. */
602 extern int try_casesi (tree
, tree
, tree
, tree
, rtx
, rtx
, rtx
);
603 extern int try_tablejump (tree
, tree
, tree
, tree
, rtx
, rtx
);
605 /* Functions from alias.c */
609 /* rtl.h and tree.h were included. */
610 /* Return an rtx for the size in bytes of the value of an expr. */
611 extern rtx
expr_size (tree
);
613 /* Return a wide integer for the size in bytes of the value of EXP, or -1
614 if the size can vary or is larger than an integer. */
615 extern HOST_WIDE_INT
int_expr_size (tree
);
617 /* Return an rtx that refers to the value returned by a function
618 in its original home. This becomes invalid if any more code is emitted. */
619 extern rtx
hard_function_value (const_tree
, const_tree
, const_tree
, int);
621 extern rtx
prepare_call_address (tree
, rtx
, rtx
, rtx
*, int, int);
623 extern bool shift_return_value (enum machine_mode
, bool, rtx
);
625 extern rtx
expand_call (tree
, rtx
, int);
627 extern void fixup_tail_calls (void);
630 extern rtx
expand_shift (enum tree_code
, enum machine_mode
, rtx
, tree
, rtx
,
632 extern rtx
expand_divmod (int, enum tree_code
, enum machine_mode
, rtx
, rtx
,
636 extern void locate_and_pad_parm (enum machine_mode
, tree
, int, int, tree
,
638 struct locate_and_pad_arg_data
*);
640 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
641 extern rtx
label_rtx (tree
);
643 /* As label_rtx, but additionally the label is placed on the forced label
644 list of its containing function (i.e. it is treated as reachable even
645 if how is not obvious). */
646 extern rtx
force_label_rtx (tree
);
648 /* Return an rtx like arg but sans any constant terms.
649 Returns the original rtx if it has no constant terms.
650 The constant terms are added and stored via a second arg. */
651 extern rtx
eliminate_constant_term (rtx
, rtx
*);
653 /* Convert arg to a valid memory address for specified machine mode that points
654 to a specific named address space, by emitting insns to perform arithmetic
656 extern rtx
memory_address_addr_space (enum machine_mode
, rtx
, addr_space_t
);
658 /* Like memory_address_addr_space, except assume the memory address points to
659 the generic named address space. */
660 #define memory_address(MODE,RTX) \
661 memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC)
663 /* Return a memory reference like MEMREF, but with its mode changed
664 to MODE and its address changed to ADDR.
665 (VOIDmode means don't change the mode.
666 NULL for ADDR means don't change the address.) */
667 extern rtx
change_address (rtx
, enum machine_mode
, rtx
);
669 /* Return a memory reference like MEMREF, but with its mode changed
670 to MODE and its address offset by OFFSET bytes. */
671 #define adjust_address(MEMREF, MODE, OFFSET) \
672 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
674 /* Likewise, but the reference is not required to be valid. */
675 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
676 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
678 /* Return a memory reference like MEMREF, but with its mode changed
679 to MODE and its address changed to ADDR, which is assumed to be
680 increased by OFFSET bytes from MEMREF. */
681 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
682 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
684 /* Likewise, but the reference is not required to be valid. */
685 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
686 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
688 extern rtx
adjust_address_1 (rtx
, enum machine_mode
, HOST_WIDE_INT
, int, int);
689 extern rtx
adjust_automodify_address_1 (rtx
, enum machine_mode
, rtx
,
692 /* Return a memory reference like MEMREF, but whose address is changed by
693 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
694 known to be in OFFSET (possibly 1). */
695 extern rtx
offset_address (rtx
, rtx
, unsigned HOST_WIDE_INT
);
697 /* Definitions from emit-rtl.c */
698 #include "emit-rtl.h"
700 /* Return a memory reference like MEMREF, but with its mode widened to
701 MODE and adjusted by OFFSET. */
702 extern rtx
widen_memory_access (rtx
, enum machine_mode
, HOST_WIDE_INT
);
704 /* Return a memory reference like MEMREF, but which is known to have a
706 extern rtx
validize_mem (rtx
);
708 extern rtx
use_anchored_address (rtx
);
710 /* Given REF, a MEM, and T, either the type of X or the expression
711 corresponding to REF, set the memory attributes. OBJECTP is nonzero
712 if we are making a new object of this type. */
713 extern void set_mem_attributes (rtx
, tree
, int);
715 /* Similar, except that BITPOS has not yet been applied to REF, so if
716 we alter MEM_OFFSET according to T then we should subtract BITPOS
717 expecting that it'll be added back in later. */
718 extern void set_mem_attributes_minus_bitpos (rtx
, tree
, int, HOST_WIDE_INT
);
720 /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN
721 bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or
723 extern int get_mem_align_offset (rtx
, unsigned int);
725 /* Assemble the static constant template for function entry trampolines. */
726 extern rtx
assemble_trampoline_template (void);
728 /* Copy given rtx to a new temp reg and return that. */
729 extern rtx
copy_to_reg (rtx
);
731 /* Like copy_to_reg but always make the reg Pmode. */
732 extern rtx
copy_addr_to_reg (rtx
);
734 /* Like copy_to_reg but always make the reg the specified mode MODE. */
735 extern rtx
copy_to_mode_reg (enum machine_mode
, rtx
);
737 /* Copy given rtx to given temp reg and return that. */
738 extern rtx
copy_to_suggested_reg (rtx
, rtx
, enum machine_mode
);
740 /* Copy a value to a register if it isn't already a register.
741 Args are mode (in case value is a constant) and the value. */
742 extern rtx
force_reg (enum machine_mode
, rtx
);
744 /* Return given rtx, copied into a new temp reg if it was in memory. */
745 extern rtx
force_not_mem (rtx
);
747 /* Return mode and signedness to use when an argument or result in the
748 given mode is promoted. */
749 extern enum machine_mode
promote_function_mode (const_tree
, enum machine_mode
, int *,
752 /* Return mode and signedness to use when an object in the given mode
754 extern enum machine_mode
promote_mode (const_tree
, enum machine_mode
, int *);
756 /* Return mode and signedness to use when object is promoted. */
757 enum machine_mode
promote_decl_mode (const_tree
, int *);
759 /* Remove some bytes from the stack. An rtx says how many. */
760 extern void adjust_stack (rtx
);
762 /* Add some bytes to the stack. An rtx says how many. */
763 extern void anti_adjust_stack (rtx
);
765 /* This enum is used for the following two functions. */
766 enum save_level
{SAVE_BLOCK
, SAVE_FUNCTION
, SAVE_NONLOCAL
};
768 /* Save the stack pointer at the specified level. */
769 extern void emit_stack_save (enum save_level
, rtx
*, rtx
);
771 /* Restore the stack pointer from a save area of the specified level. */
772 extern void emit_stack_restore (enum save_level
, rtx
, rtx
);
774 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */
775 extern void update_nonlocal_goto_save_area (void);
777 /* Allocate some space on the stack dynamically and return its address. An rtx
778 says how many bytes. */
779 extern rtx
allocate_dynamic_stack_space (rtx
, rtx
, int);
781 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
782 FIRST is a constant and size is a Pmode RTX. These are offsets from the
783 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
784 subtract from the stack. If SIZE is constant, this is done
785 with a fixed number of probes. Otherwise, we must make a loop. */
786 extern void probe_stack_range (HOST_WIDE_INT
, rtx
);
788 /* Return an rtx that refers to the value returned by a library call
789 in its original home. This becomes invalid if any more code is emitted. */
790 extern rtx
hard_libcall_value (enum machine_mode
, rtx
);
792 /* Return the mode desired by operand N of a particular bitfield
793 insert/extract insn, or MAX_MACHINE_MODE if no such insn is
796 enum extraction_pattern
{ EP_insv
, EP_extv
, EP_extzv
};
797 extern enum machine_mode
798 mode_for_extraction (enum extraction_pattern
, int);
800 extern void store_bit_field (rtx
, unsigned HOST_WIDE_INT
,
801 unsigned HOST_WIDE_INT
, enum machine_mode
, rtx
);
802 extern rtx
extract_bit_field (rtx
, unsigned HOST_WIDE_INT
,
803 unsigned HOST_WIDE_INT
, int, rtx
,
804 enum machine_mode
, enum machine_mode
);
805 extern rtx
extract_low_bits (enum machine_mode
, enum machine_mode
, rtx
);
806 extern rtx
expand_mult (enum machine_mode
, rtx
, rtx
, rtx
, int);
807 extern rtx
expand_mult_highpart_adjust (enum machine_mode
, rtx
, rtx
, rtx
, rtx
, int);
809 extern rtx
assemble_static_space (unsigned HOST_WIDE_INT
);
810 extern int safe_from_p (const_rtx
, tree
, int);
811 extern bool split_comparison (enum rtx_code
, enum machine_mode
,
812 enum rtx_code
*, enum rtx_code
*);
814 /* Call this once to initialize the contents of the optabs
815 appropriately for the current target machine. */
816 extern void init_optabs (void);
817 extern void init_all_optabs (void);
819 /* Call this to initialize an optab function entry. */
820 extern rtx
init_one_libfunc (const char *);
821 extern rtx
set_user_assembler_libfunc (const char *, const char *);
823 /* Build a decl for a libfunc named NAME. */
824 extern tree
build_libfunc_function (const char *);
826 /* Get the personality libfunc for a function decl. */
827 rtx
get_personality_function (tree
);
829 extern int vector_mode_valid_p (enum machine_mode
);
831 #endif /* GCC_EXPR_H */