1 /* Definitions for code generation pass of GNU compiler.
2 Copyright (C) 1987-2013 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
23 /* For inhibit_defer_pop */
25 /* For XEXP, GEN_INT, rtx_code */
27 /* For optimize_size */
29 /* For tree_fits_[su]hwi_p, tree_low_cst, fold_convert, size_binop, ssize_int,
30 TREE_CODE, TYPE_SIZE, int_size_in_bytes, */
31 #include "tree-core.h"
32 /* For GET_MODE_BITSIZE, word_mode */
35 /* This is the 4th arg to `expand_expr'.
36 EXPAND_STACK_PARM means we are possibly expanding a call param onto
38 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
39 EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
40 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
41 is a constant that is not a legitimate address.
42 EXPAND_WRITE means we are only going to write to the resulting rtx.
43 EXPAND_MEMORY means we are interested in a memory result, even if
44 the memory is constant and we could have propagated a constant value. */
45 enum expand_modifier
{EXPAND_NORMAL
= 0, EXPAND_STACK_PARM
, EXPAND_SUM
,
46 EXPAND_CONST_ADDRESS
, EXPAND_INITIALIZER
, EXPAND_WRITE
,
49 /* Prevent the compiler from deferring stack pops. See
50 inhibit_defer_pop for more information. */
51 #define NO_DEFER_POP (inhibit_defer_pop += 1)
53 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for
55 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
57 enum direction
{none
, upward
, downward
};
59 /* Structure to record the size of a sequence of arguments
60 as the sum of a tree-expression and a constant. This structure is
61 also used to store offsets from the stack, which might be negative,
62 so the variable part must be ssizetype, not sizetype. */
66 HOST_WIDE_INT constant
;
70 /* Package up various arg related fields of struct args for
71 locate_and_pad_parm. */
72 struct locate_and_pad_arg_data
74 /* Size of this argument on the stack, rounded up for any padding it
75 gets. If REG_PARM_STACK_SPACE is defined, then register parms are
76 counted here, otherwise they aren't. */
77 struct args_size size
;
78 /* Offset of this argument from beginning of stack-args. */
79 struct args_size offset
;
80 /* Offset to the start of the stack slot. Different from OFFSET
81 if this arg pads downward. */
82 struct args_size slot_offset
;
83 /* The amount that the stack pointer needs to be adjusted to
84 force alignment for the next argument. */
85 struct args_size alignment_pad
;
86 /* Which way we should pad this arg. */
87 enum direction where_pad
;
88 /* slot_offset is at least this aligned. */
89 unsigned int boundary
;
92 /* Add the value of the tree INC to the `struct args_size' TO. */
94 #define ADD_PARM_SIZE(TO, INC) \
97 if (tree_fits_shwi_p (inc)) \
98 (TO).constant += tree_to_shwi (inc); \
99 else if ((TO).var == 0) \
100 (TO).var = fold_convert (ssizetype, inc); \
102 (TO).var = size_binop (PLUS_EXPR, (TO).var, \
103 fold_convert (ssizetype, inc)); \
106 #define SUB_PARM_SIZE(TO, DEC) \
109 if (tree_fits_shwi_p (dec)) \
110 (TO).constant -= tree_to_shwi (dec); \
111 else if ((TO).var == 0) \
112 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \
113 fold_convert (ssizetype, dec)); \
115 (TO).var = size_binop (MINUS_EXPR, (TO).var, \
116 fold_convert (ssizetype, dec)); \
119 /* Convert the implicit sum in a `struct args_size' into a tree
120 of type ssizetype. */
121 #define ARGS_SIZE_TREE(SIZE) \
122 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \
123 : size_binop (PLUS_EXPR, fold_convert (ssizetype, (SIZE).var), \
124 ssize_int ((SIZE).constant)))
126 /* Convert the implicit sum in a `struct args_size' into an rtx. */
127 #define ARGS_SIZE_RTX(SIZE) \
128 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
129 : expand_normal (ARGS_SIZE_TREE (SIZE)))
132 /* This structure is used to pass around information about exploded
133 unary, binary and trinary expressions between expand_expr_real_1 and
135 typedef struct separate_ops
143 /* Functions from optabs.c, commonly used, and without need for the optabs
146 /* Passed to expand_simple_binop and expand_binop to say which options
147 to try to use if the requested operation can't be open-coded on the
148 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
149 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
150 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
151 try anything else. */
162 /* Generate code for a simple binary or unary operation. "Simple" in
163 this case means "can be unambiguously described by a (mode, code)
164 pair and mapped to a single optab." */
165 extern rtx
expand_simple_binop (enum machine_mode
, enum rtx_code
, rtx
,
166 rtx
, rtx
, int, enum optab_methods
);
167 extern rtx
expand_simple_unop (enum machine_mode
, enum rtx_code
, rtx
, rtx
,
170 /* Report whether the machine description contains an insn which can
171 perform the operation described by CODE and MODE. */
172 extern int have_insn_for (enum rtx_code
, enum machine_mode
);
174 /* Emit code to make a call to a constant function or a library call. */
175 extern void emit_libcall_block (rtx
, rtx
, rtx
, rtx
);
177 /* Create but don't emit one rtl instruction to perform certain operations.
178 Modes must match; operands must meet the operation's predicates.
179 Likewise for subtraction and for just copying. */
180 extern rtx
gen_add2_insn (rtx
, rtx
);
181 extern rtx
gen_add3_insn (rtx
, rtx
, rtx
);
182 extern rtx
gen_sub2_insn (rtx
, rtx
);
183 extern rtx
gen_sub3_insn (rtx
, rtx
, rtx
);
184 extern rtx
gen_move_insn (rtx
, rtx
);
185 extern int have_add2_insn (rtx
, rtx
);
186 extern int have_sub2_insn (rtx
, rtx
);
188 /* Emit a pair of rtl insns to compare two rtx's and to jump
189 to a label if the comparison is true. */
190 extern void emit_cmp_and_jump_insns (rtx
, rtx
, enum rtx_code
, rtx
,
191 enum machine_mode
, int, rtx
, int prob
=-1);
193 /* Generate code to indirectly jump to a location given in the rtx LOC. */
194 extern void emit_indirect_jump (rtx
);
196 /* Generate a conditional trap instruction. */
197 extern rtx
gen_cond_trap (enum rtx_code
, rtx
, rtx
, rtx
);
199 #include "insn-config.h"
201 #ifdef HAVE_conditional_move
202 /* Emit a conditional move operation. */
203 rtx
emit_conditional_move (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
204 rtx
, rtx
, enum machine_mode
, int);
206 /* Return nonzero if the conditional move is supported. */
207 int can_conditionally_move_p (enum machine_mode mode
);
210 rtx
emit_conditional_add (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
211 rtx
, rtx
, enum machine_mode
, int);
213 rtx
expand_sync_operation (rtx
, rtx
, enum rtx_code
);
214 rtx
expand_sync_fetch_operation (rtx
, rtx
, enum rtx_code
, bool, rtx
);
215 rtx
expand_sync_lock_test_and_set (rtx
, rtx
, rtx
);
217 rtx
expand_atomic_exchange (rtx
, rtx
, rtx
, enum memmodel
);
218 rtx
expand_atomic_load (rtx
, rtx
, enum memmodel
);
219 rtx
expand_atomic_store (rtx
, rtx
, enum memmodel
, bool);
220 rtx
expand_atomic_fetch_op (rtx
, rtx
, rtx
, enum rtx_code
, enum memmodel
,
222 rtx
expand_atomic_test_and_set (rtx
, rtx
, enum memmodel
);
223 rtx
expand_atomic_clear (rtx
, enum memmodel
);
224 void expand_atomic_thread_fence (enum memmodel
);
225 void expand_atomic_signal_fence (enum memmodel
);
228 /* Functions from expmed.c: */
230 /* Arguments MODE, RTX: return an rtx for the negation of that value.
232 extern rtx
negate_rtx (enum machine_mode
, rtx
);
234 /* Expand a logical AND operation. */
235 extern rtx
expand_and (enum machine_mode
, rtx
, rtx
, rtx
);
237 /* Emit a store-flag operation. */
238 extern rtx
emit_store_flag (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
241 /* Like emit_store_flag, but always succeeds. */
242 extern rtx
emit_store_flag_force (rtx
, enum rtx_code
, rtx
, rtx
,
243 enum machine_mode
, int, int);
245 /* Choose a minimal N + 1 bit approximation to 1/D that can be used to
246 replace division by D, and put the least significant N bits of the result
247 in *MULTIPLIER_PTR and return the most significant bit. */
248 extern unsigned HOST_WIDE_INT
choose_multiplier (unsigned HOST_WIDE_INT
, int,
249 int, unsigned HOST_WIDE_INT
*,
252 /* Functions from builtins.c: */
253 extern rtx
expand_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
254 extern tree
std_build_builtin_va_list (void);
255 extern tree
std_fn_abi_va_list (tree
);
256 extern tree
std_canonical_va_list_type (tree
);
258 extern void std_expand_builtin_va_start (tree
, rtx
);
259 extern rtx
default_expand_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
260 extern void expand_builtin_setjmp_setup (rtx
, rtx
);
261 extern void expand_builtin_setjmp_receiver (rtx
);
262 extern rtx
expand_builtin_saveregs (void);
263 extern void expand_builtin_trap (void);
264 extern rtx
builtin_strncpy_read_str (void *, HOST_WIDE_INT
, enum machine_mode
);
266 /* Functions from expr.c: */
268 /* This is run during target initialization to set up which modes can be
269 used directly in memory and to initialize the block move optab. */
270 extern void init_expr_target (void);
272 /* This is run at the start of compiling a function. */
273 extern void init_expr (void);
275 /* Emit some rtl insns to move data between rtx's, converting machine modes.
276 Both modes must be floating or both fixed. */
277 extern void convert_move (rtx
, rtx
, int);
279 /* Convert an rtx to specified machine mode and return the result. */
280 extern rtx
convert_to_mode (enum machine_mode
, rtx
, int);
282 /* Convert an rtx to MODE from OLDMODE and return the result. */
283 extern rtx
convert_modes (enum machine_mode
, enum machine_mode
, rtx
, int);
285 /* Emit code to move a block Y to a block X. */
287 enum block_op_methods
292 /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */
296 extern GTY(()) tree block_clear_fn
;
297 extern void init_block_move_fn (const char *);
298 extern void init_block_clear_fn (const char *);
300 extern rtx
emit_block_move (rtx
, rtx
, rtx
, enum block_op_methods
);
301 extern rtx
emit_block_move_via_libcall (rtx
, rtx
, rtx
, bool);
302 extern rtx
emit_block_move_hints (rtx
, rtx
, rtx
, enum block_op_methods
,
303 unsigned int, HOST_WIDE_INT
,
304 unsigned HOST_WIDE_INT
,
305 unsigned HOST_WIDE_INT
);
306 extern bool emit_storent_insn (rtx to
, rtx from
);
308 /* Copy all or part of a value X into registers starting at REGNO.
309 The number of registers to be filled is NREGS. */
310 extern void move_block_to_reg (int, rtx
, int, enum machine_mode
);
312 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
313 The number of registers to be filled is NREGS. */
314 extern void move_block_from_reg (int, rtx
, int);
316 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
317 extern rtx
gen_group_rtx (rtx
);
319 /* Load a BLKmode value into non-consecutive registers represented by a
321 extern void emit_group_load (rtx
, rtx
, tree
, int);
323 /* Similarly, but load into new temporaries. */
324 extern rtx
emit_group_load_into_temps (rtx
, rtx
, tree
, int);
326 /* Move a non-consecutive group of registers represented by a PARALLEL into
327 a non-consecutive group of registers represented by a PARALLEL. */
328 extern void emit_group_move (rtx
, rtx
);
330 /* Move a group of registers represented by a PARALLEL into pseudos. */
331 extern rtx
emit_group_move_into_temps (rtx
);
333 /* Store a BLKmode value from non-consecutive registers represented by a
335 extern void emit_group_store (rtx
, rtx
, tree
, int);
337 extern rtx
maybe_emit_group_store (rtx
, tree
);
339 /* Copy BLKmode object from a set of registers. */
340 extern void copy_blkmode_from_reg (rtx
, rtx
, tree
);
342 /* Mark REG as holding a parameter for the next CALL_INSN.
343 Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode. */
344 extern void use_reg_mode (rtx
*, rtx
, enum machine_mode
);
346 extern rtx
copy_blkmode_to_reg (enum machine_mode
, tree
);
348 /* Mark REG as holding a parameter for the next CALL_INSN. */
350 use_reg (rtx
*fusage
, rtx reg
)
352 use_reg_mode (fusage
, reg
, VOIDmode
);
355 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
356 for the next CALL_INSN. */
357 extern void use_regs (rtx
*, int, int);
359 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
360 extern void use_group_regs (rtx
*, rtx
);
362 /* Write zeros through the storage of OBJECT.
363 If OBJECT has BLKmode, SIZE is its length in bytes. */
364 extern rtx
clear_storage (rtx
, rtx
, enum block_op_methods
);
365 extern rtx
clear_storage_hints (rtx
, rtx
, enum block_op_methods
,
366 unsigned int, HOST_WIDE_INT
,
367 unsigned HOST_WIDE_INT
,
368 unsigned HOST_WIDE_INT
);
369 /* The same, but always output an library call. */
370 rtx
set_storage_via_libcall (rtx
, rtx
, rtx
, bool);
372 /* Expand a setmem pattern; return true if successful. */
373 extern bool set_storage_via_setmem (rtx
, rtx
, rtx
, unsigned int,
374 unsigned int, HOST_WIDE_INT
,
375 unsigned HOST_WIDE_INT
,
376 unsigned HOST_WIDE_INT
);
378 extern unsigned HOST_WIDE_INT
move_by_pieces_ninsns (unsigned HOST_WIDE_INT
,
382 /* Return nonzero if it is desirable to store LEN bytes generated by
383 CONSTFUN with several move instructions by store_by_pieces
384 function. CONSTFUNDATA is a pointer which will be passed as argument
385 in every CONSTFUN call.
386 ALIGN is maximum alignment we can assume.
387 MEMSETP is true if this is a real memset/bzero, not a copy
388 of a const string. */
389 extern int can_store_by_pieces (unsigned HOST_WIDE_INT
,
390 rtx (*) (void *, HOST_WIDE_INT
,
392 void *, unsigned int, bool);
394 /* Generate several move instructions to store LEN bytes generated by
395 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
396 pointer which will be passed as argument in every CONSTFUN call.
397 ALIGN is maximum alignment we can assume.
398 MEMSETP is true if this is a real memset/bzero, not a copy.
400 extern rtx
store_by_pieces (rtx
, unsigned HOST_WIDE_INT
,
401 rtx (*) (void *, HOST_WIDE_INT
, enum machine_mode
),
402 void *, unsigned int, bool, int);
404 /* Emit insns to set X from Y. */
405 extern rtx
emit_move_insn (rtx
, rtx
);
407 /* Emit insns to set X from Y, with no frills. */
408 extern rtx
emit_move_insn_1 (rtx
, rtx
);
410 extern rtx
emit_move_complex_push (enum machine_mode
, rtx
, rtx
);
411 extern rtx
emit_move_complex_parts (rtx
, rtx
);
413 /* Push a block of length SIZE (perhaps variable)
414 and return an rtx to address the beginning of the block. */
415 extern rtx
push_block (rtx
, int, int);
417 /* Generate code to push something onto the stack, given its mode and type. */
418 extern void emit_push_insn (rtx
, enum machine_mode
, tree
, rtx
, unsigned int,
419 int, rtx
, int, rtx
, rtx
, int, rtx
);
421 /* Expand an assignment that stores the value of FROM into TO. */
422 extern void expand_assignment (tree
, tree
, bool);
424 /* Generate code for computing expression EXP,
425 and storing the value into TARGET.
426 If SUGGEST_REG is nonzero, copy the value through a register
427 and return that register, if that is possible. */
428 extern rtx
store_expr (tree
, rtx
, int, bool);
430 /* Given an rtx that may include add and multiply operations,
431 generate them as insns and return a pseudo-reg containing the value.
432 Useful after calling expand_expr with 1 as sum_ok. */
433 extern rtx
force_operand (rtx
, rtx
);
435 /* Work horses for expand_expr. */
436 extern rtx
expand_expr_real (tree
, rtx
, enum machine_mode
,
437 enum expand_modifier
, rtx
*);
438 extern rtx
expand_expr_real_1 (tree
, rtx
, enum machine_mode
,
439 enum expand_modifier
, rtx
*);
440 extern rtx
expand_expr_real_2 (sepops
, rtx
, enum machine_mode
,
441 enum expand_modifier
);
443 /* Generate code for computing expression EXP.
444 An rtx for the computed value is returned. The value is never null.
445 In the case of a void EXP, const0_rtx is returned. */
447 expand_expr (tree exp
, rtx target
, enum machine_mode mode
,
448 enum expand_modifier modifier
)
450 return expand_expr_real (exp
, target
, mode
, modifier
, NULL
);
454 expand_normal (tree exp
)
456 return expand_expr_real (exp
, NULL_RTX
, VOIDmode
, EXPAND_NORMAL
, NULL
);
459 /* At the start of a function, record that we have no previously-pushed
460 arguments waiting to be popped. */
461 extern void init_pending_stack_adjust (void);
463 /* Discard any pending stack adjustment. */
464 extern void discard_pending_stack_adjust (void);
466 /* When exiting from function, if safe, clear out any pending stack adjust
467 so the adjustment won't get done. */
468 extern void clear_pending_stack_adjust (void);
470 /* Pop any previously-pushed arguments that have not been popped yet. */
471 extern void do_pending_stack_adjust (void);
473 /* Return the tree node and offset if a given argument corresponds to
474 a string constant. */
475 extern tree
string_constant (tree
, tree
*);
477 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
478 extern void jumpifnot (tree
, rtx
, int);
479 extern void jumpifnot_1 (enum tree_code
, tree
, tree
, rtx
, int);
481 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
482 extern void jumpif (tree
, rtx
, int);
483 extern void jumpif_1 (enum tree_code
, tree
, tree
, rtx
, int);
485 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
486 the result is zero, or IF_TRUE_LABEL if the result is one. */
487 extern void do_jump (tree
, rtx
, rtx
, int);
488 extern void do_jump_1 (enum tree_code
, tree
, tree
, rtx
, rtx
, int);
490 extern void do_compare_rtx_and_jump (rtx
, rtx
, enum rtx_code
, int,
491 enum machine_mode
, rtx
, rtx
, rtx
, int);
493 /* Two different ways of generating switch statements. */
494 extern int try_casesi (tree
, tree
, tree
, tree
, rtx
, rtx
, rtx
, int);
495 extern int try_tablejump (tree
, tree
, tree
, tree
, rtx
, rtx
, int);
497 /* Functions from alias.c */
501 /* rtl.h and tree.h were included. */
502 /* Return an rtx for the size in bytes of the value of an expr. */
503 extern rtx
expr_size (tree
);
505 /* Return a wide integer for the size in bytes of the value of EXP, or -1
506 if the size can vary or is larger than an integer. */
507 extern HOST_WIDE_INT
int_expr_size (tree
);
509 /* Return an rtx that refers to the value returned by a function
510 in its original home. This becomes invalid if any more code is emitted. */
511 extern rtx
hard_function_value (const_tree
, const_tree
, const_tree
, int);
513 extern rtx
prepare_call_address (tree
, rtx
, rtx
, rtx
*, int, int);
515 extern bool shift_return_value (enum machine_mode
, bool, rtx
);
517 extern rtx
expand_call (tree
, rtx
, int);
519 extern void fixup_tail_calls (void);
522 extern rtx
expand_variable_shift (enum tree_code
, enum machine_mode
,
523 rtx
, tree
, rtx
, int);
524 extern rtx
expand_shift (enum tree_code
, enum machine_mode
, rtx
, int, rtx
,
526 extern rtx
expand_divmod (int, enum tree_code
, enum machine_mode
, rtx
, rtx
,
530 extern void locate_and_pad_parm (enum machine_mode
, tree
, int, int, int,
531 tree
, struct args_size
*,
532 struct locate_and_pad_arg_data
*);
534 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
535 extern rtx
label_rtx (tree
);
537 /* As label_rtx, but additionally the label is placed on the forced label
538 list of its containing function (i.e. it is treated as reachable even
539 if how is not obvious). */
540 extern rtx
force_label_rtx (tree
);
542 /* Return an rtx like arg but sans any constant terms.
543 Returns the original rtx if it has no constant terms.
544 The constant terms are added and stored via a second arg. */
545 extern rtx
eliminate_constant_term (rtx
, rtx
*);
547 /* Convert arg to a valid memory address for specified machine mode that points
548 to a specific named address space, by emitting insns to perform arithmetic
550 extern rtx
memory_address_addr_space (enum machine_mode
, rtx
, addr_space_t
);
552 /* Like memory_address_addr_space, except assume the memory address points to
553 the generic named address space. */
554 #define memory_address(MODE,RTX) \
555 memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC)
557 /* Return a memory reference like MEMREF, but with its mode changed
558 to MODE and its address changed to ADDR.
559 (VOIDmode means don't change the mode.
560 NULL for ADDR means don't change the address.) */
561 extern rtx
change_address (rtx
, enum machine_mode
, rtx
);
563 /* Return a memory reference like MEMREF, but with its mode changed
564 to MODE and its address offset by OFFSET bytes. */
565 #define adjust_address(MEMREF, MODE, OFFSET) \
566 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 0, 0)
568 /* Likewise, but the reference is not required to be valid. */
569 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
570 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1, 0, 0)
572 /* Return a memory reference like MEMREF, but with its mode changed
573 to MODE and its address offset by OFFSET bytes. Assume that it's
574 for a bitfield and conservatively drop the underlying object if we
575 cannot be sure to stay within its bounds. */
576 #define adjust_bitfield_address(MEMREF, MODE, OFFSET) \
577 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 1, 0)
579 /* As for adjust_bitfield_address, but specify that the width of
580 BLKmode accesses is SIZE bytes. */
581 #define adjust_bitfield_address_size(MEMREF, MODE, OFFSET, SIZE) \
582 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 1, SIZE)
584 /* Likewise, but the reference is not required to be valid. */
585 #define adjust_bitfield_address_nv(MEMREF, MODE, OFFSET) \
586 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1, 1, 0)
588 /* Return a memory reference like MEMREF, but with its mode changed
589 to MODE and its address changed to ADDR, which is assumed to be
590 increased by OFFSET bytes from MEMREF. */
591 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
592 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
594 /* Likewise, but the reference is not required to be valid. */
595 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
596 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
598 extern rtx
adjust_address_1 (rtx
, enum machine_mode
, HOST_WIDE_INT
, int, int,
600 extern rtx
adjust_automodify_address_1 (rtx
, enum machine_mode
, rtx
,
603 /* Return a memory reference like MEMREF, but whose address is changed by
604 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
605 known to be in OFFSET (possibly 1). */
606 extern rtx
offset_address (rtx
, rtx
, unsigned HOST_WIDE_INT
);
608 /* Definitions from emit-rtl.c */
609 #include "emit-rtl.h"
611 /* Return a memory reference like MEMREF, but with its mode widened to
612 MODE and adjusted by OFFSET. */
613 extern rtx
widen_memory_access (rtx
, enum machine_mode
, HOST_WIDE_INT
);
615 /* Return a memory reference like MEMREF, but which is known to have a
617 extern rtx
validize_mem (rtx
);
619 extern rtx
use_anchored_address (rtx
);
621 /* Given REF, a MEM, and T, either the type of X or the expression
622 corresponding to REF, set the memory attributes. OBJECTP is nonzero
623 if we are making a new object of this type. */
624 extern void set_mem_attributes (rtx
, tree
, int);
626 /* Similar, except that BITPOS has not yet been applied to REF, so if
627 we alter MEM_OFFSET according to T then we should subtract BITPOS
628 expecting that it'll be added back in later. */
629 extern void set_mem_attributes_minus_bitpos (rtx
, tree
, int, HOST_WIDE_INT
);
631 /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN
632 bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or
634 extern int get_mem_align_offset (rtx
, unsigned int);
636 /* Assemble the static constant template for function entry trampolines. */
637 extern rtx
assemble_trampoline_template (void);
639 /* Copy given rtx to a new temp reg and return that. */
640 extern rtx
copy_to_reg (rtx
);
642 /* Like copy_to_reg but always make the reg Pmode. */
643 extern rtx
copy_addr_to_reg (rtx
);
645 /* Like copy_to_reg but always make the reg the specified mode MODE. */
646 extern rtx
copy_to_mode_reg (enum machine_mode
, rtx
);
648 /* Copy given rtx to given temp reg and return that. */
649 extern rtx
copy_to_suggested_reg (rtx
, rtx
, enum machine_mode
);
651 /* Copy a value to a register if it isn't already a register.
652 Args are mode (in case value is a constant) and the value. */
653 extern rtx
force_reg (enum machine_mode
, rtx
);
655 /* Return given rtx, copied into a new temp reg if it was in memory. */
656 extern rtx
force_not_mem (rtx
);
658 /* Return mode and signedness to use when an argument or result in the
659 given mode is promoted. */
660 extern enum machine_mode
promote_function_mode (const_tree
, enum machine_mode
, int *,
663 /* Return mode and signedness to use when an object in the given mode
665 extern enum machine_mode
promote_mode (const_tree
, enum machine_mode
, int *);
667 /* Return mode and signedness to use when object is promoted. */
668 enum machine_mode
promote_decl_mode (const_tree
, int *);
670 /* Remove some bytes from the stack. An rtx says how many. */
671 extern void adjust_stack (rtx
);
673 /* Add some bytes to the stack. An rtx says how many. */
674 extern void anti_adjust_stack (rtx
);
676 /* Add some bytes to the stack while probing it. An rtx says how many. */
677 extern void anti_adjust_stack_and_probe (rtx
, bool);
679 /* This enum is used for the following two functions. */
680 enum save_level
{SAVE_BLOCK
, SAVE_FUNCTION
, SAVE_NONLOCAL
};
682 /* Save the stack pointer at the specified level. */
683 extern void emit_stack_save (enum save_level
, rtx
*);
685 /* Restore the stack pointer from a save area of the specified level. */
686 extern void emit_stack_restore (enum save_level
, rtx
);
688 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */
689 extern void update_nonlocal_goto_save_area (void);
691 /* Allocate some space on the stack dynamically and return its address. */
692 extern rtx
allocate_dynamic_stack_space (rtx
, unsigned, unsigned, bool);
694 /* Emit one stack probe at ADDRESS, an address within the stack. */
695 extern void emit_stack_probe (rtx
);
697 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
698 FIRST is a constant and size is a Pmode RTX. These are offsets from
699 the current stack pointer. STACK_GROWS_DOWNWARD says whether to add
700 or subtract them from the stack pointer. */
701 extern void probe_stack_range (HOST_WIDE_INT
, rtx
);
703 /* Return an rtx that refers to the value returned by a library call
704 in its original home. This becomes invalid if any more code is emitted. */
705 extern rtx
hard_libcall_value (enum machine_mode
, rtx
);
707 extern void store_bit_field (rtx
, unsigned HOST_WIDE_INT
,
708 unsigned HOST_WIDE_INT
,
709 unsigned HOST_WIDE_INT
,
710 unsigned HOST_WIDE_INT
,
711 enum machine_mode
, rtx
);
712 extern rtx
extract_bit_field (rtx
, unsigned HOST_WIDE_INT
,
713 unsigned HOST_WIDE_INT
, int, rtx
,
714 enum machine_mode
, enum machine_mode
);
715 extern rtx
extract_low_bits (enum machine_mode
, enum machine_mode
, rtx
);
716 extern rtx
expand_mult (enum machine_mode
, rtx
, rtx
, rtx
, int);
717 extern rtx
expand_mult_highpart_adjust (enum machine_mode
, rtx
, rtx
, rtx
, rtx
, int);
719 extern rtx
assemble_static_space (unsigned HOST_WIDE_INT
);
720 extern int safe_from_p (const_rtx
, tree
, int);
721 extern bool split_comparison (enum rtx_code
, enum machine_mode
,
722 enum rtx_code
*, enum rtx_code
*);
724 /* Call this once to initialize the contents of the optabs
725 appropriately for the current target machine. */
726 extern void init_optabs (void);
727 extern void init_all_optabs (struct target_optabs
*);
729 /* Call this to initialize an optab function entry. */
730 extern rtx
init_one_libfunc (const char *);
731 extern rtx
set_user_assembler_libfunc (const char *, const char *);
733 /* Build a decl for a libfunc named NAME. */
734 extern tree
build_libfunc_function (const char *);
736 /* Get the personality libfunc for a function decl. */
737 rtx
get_personality_function (tree
);
742 /* Expand a GIMPLE_SWITCH statement. */
743 extern void expand_case (gimple
);
745 /* Like expand_case but special-case for SJLJ exception dispatching. */
746 extern void expand_sjlj_dispatch_table (rtx
, vec
<tree
> );
748 #endif /* GCC_EXPR_H */