1 /* Definitions for code generation pass of GNU compiler.
2 Copyright (C) 1987-2014 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 */
29 #include "hard-reg-set.h"
32 /* For XEXP, GEN_INT, rtx_code */
34 /* For optimize_size */
36 /* For tree_fits_[su]hwi_p, tree_to_[su]hwi, fold_convert, size_binop,
37 ssize_int, TREE_CODE, TYPE_SIZE, int_size_in_bytes, */
38 #include "tree-core.h"
39 /* For GET_MODE_BITSIZE, word_mode */
40 #include "insn-config.h"
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 or the memory is unaligned on a STRICT_ALIGNMENT target. */
53 enum expand_modifier
{EXPAND_NORMAL
= 0, EXPAND_STACK_PARM
, EXPAND_SUM
,
54 EXPAND_CONST_ADDRESS
, EXPAND_INITIALIZER
, EXPAND_WRITE
,
57 /* Prevent the compiler from deferring stack pops. See
58 inhibit_defer_pop for more information. */
59 #define NO_DEFER_POP (inhibit_defer_pop += 1)
61 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for
63 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
65 /* This structure is used to pass around information about exploded
66 unary, binary and trinary expressions between expand_expr_real_1 and
68 typedef struct separate_ops
76 /* Functions from expmed.c: */
78 /* Arguments MODE, RTX: return an rtx for the negation of that value.
80 extern rtx
negate_rtx (machine_mode
, rtx
);
82 /* Expand a logical AND operation. */
83 extern rtx
expand_and (machine_mode
, rtx
, rtx
, rtx
);
85 /* Emit a store-flag operation. */
86 extern rtx
emit_store_flag (rtx
, enum rtx_code
, rtx
, rtx
, machine_mode
,
89 /* Like emit_store_flag, but always succeeds. */
90 extern rtx
emit_store_flag_force (rtx
, enum rtx_code
, rtx
, rtx
,
91 machine_mode
, int, int);
93 /* Choose a minimal N + 1 bit approximation to 1/D that can be used to
94 replace division by D, and put the least significant N bits of the result
95 in *MULTIPLIER_PTR and return the most significant bit. */
96 extern unsigned HOST_WIDE_INT
choose_multiplier (unsigned HOST_WIDE_INT
, int,
97 int, unsigned HOST_WIDE_INT
*,
100 /* Functions from expr.c: */
102 /* This is run during target initialization to set up which modes can be
103 used directly in memory and to initialize the block move optab. */
104 extern void init_expr_target (void);
106 /* This is run at the start of compiling a function. */
107 extern void init_expr (void);
109 /* Emit some rtl insns to move data between rtx's, converting machine modes.
110 Both modes must be floating or both fixed. */
111 extern void convert_move (rtx
, rtx
, int);
113 /* Convert an rtx to specified machine mode and return the result. */
114 extern rtx
convert_to_mode (machine_mode
, rtx
, int);
116 /* Convert an rtx to MODE from OLDMODE and return the result. */
117 extern rtx
convert_modes (machine_mode
, machine_mode
, rtx
, int);
119 /* Emit code to move a block Y to a block X. */
121 enum block_op_methods
126 /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */
130 extern GTY(()) tree block_clear_fn
;
131 extern void init_block_move_fn (const char *);
132 extern void init_block_clear_fn (const char *);
134 extern rtx
emit_block_move (rtx
, rtx
, rtx
, enum block_op_methods
);
135 extern rtx
emit_block_move_via_libcall (rtx
, rtx
, rtx
, bool);
136 extern rtx
emit_block_move_hints (rtx
, rtx
, rtx
, enum block_op_methods
,
137 unsigned int, HOST_WIDE_INT
,
138 unsigned HOST_WIDE_INT
,
139 unsigned HOST_WIDE_INT
,
140 unsigned HOST_WIDE_INT
);
141 extern bool emit_storent_insn (rtx to
, rtx from
);
143 /* Copy all or part of a value X into registers starting at REGNO.
144 The number of registers to be filled is NREGS. */
145 extern void move_block_to_reg (int, rtx
, int, machine_mode
);
147 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
148 The number of registers to be filled is NREGS. */
149 extern void move_block_from_reg (int, rtx
, int);
151 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
152 extern rtx
gen_group_rtx (rtx
);
154 /* Load a BLKmode value into non-consecutive registers represented by a
156 extern void emit_group_load (rtx
, rtx
, tree
, int);
158 /* Similarly, but load into new temporaries. */
159 extern rtx
emit_group_load_into_temps (rtx
, rtx
, tree
, int);
161 /* Move a non-consecutive group of registers represented by a PARALLEL into
162 a non-consecutive group of registers represented by a PARALLEL. */
163 extern void emit_group_move (rtx
, rtx
);
165 /* Move a group of registers represented by a PARALLEL into pseudos. */
166 extern rtx
emit_group_move_into_temps (rtx
);
168 /* Store a BLKmode value from non-consecutive registers represented by a
170 extern void emit_group_store (rtx
, rtx
, tree
, int);
172 extern rtx
maybe_emit_group_store (rtx
, tree
);
174 /* Copy BLKmode object from a set of registers. */
175 extern void copy_blkmode_from_reg (rtx
, rtx
, tree
);
177 /* Mark REG as holding a parameter for the next CALL_INSN.
178 Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode. */
179 extern void use_reg_mode (rtx
*, rtx
, machine_mode
);
180 extern void clobber_reg_mode (rtx
*, rtx
, machine_mode
);
182 extern rtx
copy_blkmode_to_reg (machine_mode
, tree
);
184 /* Mark REG as holding a parameter for the next CALL_INSN. */
186 use_reg (rtx
*fusage
, rtx reg
)
188 use_reg_mode (fusage
, reg
, VOIDmode
);
191 /* Mark REG as clobbered by the call with FUSAGE as CALL_INSN_FUNCTION_USAGE. */
193 clobber_reg (rtx
*fusage
, rtx reg
)
195 clobber_reg_mode (fusage
, reg
, VOIDmode
);
198 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
199 for the next CALL_INSN. */
200 extern void use_regs (rtx
*, int, int);
202 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
203 extern void use_group_regs (rtx
*, rtx
);
205 /* Write zeros through the storage of OBJECT.
206 If OBJECT has BLKmode, SIZE is its length in bytes. */
207 extern rtx
clear_storage (rtx
, rtx
, enum block_op_methods
);
208 extern rtx
clear_storage_hints (rtx
, rtx
, enum block_op_methods
,
209 unsigned int, HOST_WIDE_INT
,
210 unsigned HOST_WIDE_INT
,
211 unsigned HOST_WIDE_INT
,
212 unsigned HOST_WIDE_INT
);
213 /* The same, but always output an library call. */
214 rtx
set_storage_via_libcall (rtx
, rtx
, rtx
, bool);
216 /* Expand a setmem pattern; return true if successful. */
217 extern bool set_storage_via_setmem (rtx
, rtx
, rtx
, unsigned int,
218 unsigned int, HOST_WIDE_INT
,
219 unsigned HOST_WIDE_INT
,
220 unsigned HOST_WIDE_INT
,
221 unsigned HOST_WIDE_INT
);
223 extern unsigned HOST_WIDE_INT
move_by_pieces_ninsns (unsigned HOST_WIDE_INT
,
227 /* Return nonzero if it is desirable to store LEN bytes generated by
228 CONSTFUN with several move instructions by store_by_pieces
229 function. CONSTFUNDATA is a pointer which will be passed as argument
230 in every CONSTFUN call.
231 ALIGN is maximum alignment we can assume.
232 MEMSETP is true if this is a real memset/bzero, not a copy
233 of a const string. */
234 extern int can_store_by_pieces (unsigned HOST_WIDE_INT
,
235 rtx (*) (void *, HOST_WIDE_INT
,
237 void *, unsigned int, bool);
239 /* Generate several move instructions to store LEN bytes generated by
240 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
241 pointer which will be passed as argument in every CONSTFUN call.
242 ALIGN is maximum alignment we can assume.
243 MEMSETP is true if this is a real memset/bzero, not a copy.
245 extern rtx
store_by_pieces (rtx
, unsigned HOST_WIDE_INT
,
246 rtx (*) (void *, HOST_WIDE_INT
, machine_mode
),
247 void *, unsigned int, bool, int);
249 /* Emit insns to set X from Y. */
250 extern rtx_insn
*emit_move_insn (rtx
, rtx
);
251 extern rtx
gen_move_insn (rtx
, rtx
);
253 /* Emit insns to set X from Y, with no frills. */
254 extern rtx_insn
*emit_move_insn_1 (rtx
, rtx
);
256 extern rtx_insn
*emit_move_complex_push (machine_mode
, rtx
, rtx
);
257 extern rtx_insn
*emit_move_complex_parts (rtx
, rtx
);
258 extern rtx
emit_move_resolve_push (machine_mode
, rtx
);
260 /* Push a block of length SIZE (perhaps variable)
261 and return an rtx to address the beginning of the block. */
262 extern rtx
push_block (rtx
, int, int);
264 /* Generate code to push something onto the stack, given its mode and type. */
265 extern void emit_push_insn (rtx
, machine_mode
, tree
, rtx
, unsigned int,
266 int, rtx
, int, rtx
, rtx
, int, rtx
);
268 /* Expand an assignment that stores the value of FROM into TO. */
269 extern void expand_assignment (tree
, tree
, bool);
271 /* Generate code for computing expression EXP,
272 and storing the value into TARGET.
273 If SUGGEST_REG is nonzero, copy the value through a register
274 and return that register, if that is possible. */
275 extern rtx
store_expr_with_bounds (tree
, rtx
, int, bool, tree
);
276 extern rtx
store_expr (tree
, rtx
, int, bool);
278 /* Given an rtx that may include add and multiply operations,
279 generate them as insns and return a pseudo-reg containing the value.
280 Useful after calling expand_expr with 1 as sum_ok. */
281 extern rtx
force_operand (rtx
, rtx
);
283 /* Work horses for expand_expr. */
284 extern rtx
expand_expr_real (tree
, rtx
, machine_mode
,
285 enum expand_modifier
, rtx
*, bool);
286 extern rtx
expand_expr_real_1 (tree
, rtx
, machine_mode
,
287 enum expand_modifier
, rtx
*, bool);
288 extern rtx
expand_expr_real_2 (sepops
, rtx
, machine_mode
,
289 enum expand_modifier
);
291 /* Generate code for computing expression EXP.
292 An rtx for the computed value is returned. The value is never null.
293 In the case of a void EXP, const0_rtx is returned. */
295 expand_expr (tree exp
, rtx target
, machine_mode mode
,
296 enum expand_modifier modifier
)
298 return expand_expr_real (exp
, target
, mode
, modifier
, NULL
, false);
302 expand_normal (tree exp
)
304 return expand_expr_real (exp
, NULL_RTX
, VOIDmode
, EXPAND_NORMAL
, NULL
, false);
307 /* At the start of a function, record that we have no previously-pushed
308 arguments waiting to be popped. */
309 extern void init_pending_stack_adjust (void);
311 /* Discard any pending stack adjustment. */
312 extern void discard_pending_stack_adjust (void);
314 /* When exiting from function, if safe, clear out any pending stack adjust
315 so the adjustment won't get done. */
316 extern void clear_pending_stack_adjust (void);
318 /* Pop any previously-pushed arguments that have not been popped yet. */
319 extern void do_pending_stack_adjust (void);
321 /* Struct for saving/restoring of pending_stack_adjust/stack_pointer_delta
324 struct saved_pending_stack_adjust
326 /* Saved value of pending_stack_adjust. */
327 int x_pending_stack_adjust
;
329 /* Saved value of stack_pointer_delta. */
330 int x_stack_pointer_delta
;
333 /* Remember pending_stack_adjust/stack_pointer_delta.
334 To be used around code that may call do_pending_stack_adjust (),
335 but the generated code could be discarded e.g. using delete_insns_since. */
337 extern void save_pending_stack_adjust (saved_pending_stack_adjust
*);
339 /* Restore the saved pending_stack_adjust/stack_pointer_delta. */
341 extern void restore_pending_stack_adjust (saved_pending_stack_adjust
*);
343 /* Return the tree node and offset if a given argument corresponds to
344 a string constant. */
345 extern tree
string_constant (tree
, tree
*);
347 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
348 extern void jumpifnot (tree
, rtx
, int);
349 extern void jumpifnot_1 (enum tree_code
, tree
, tree
, rtx
, int);
351 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
352 extern void jumpif (tree
, rtx
, int);
353 extern void jumpif_1 (enum tree_code
, tree
, tree
, rtx
, int);
355 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
356 the result is zero, or IF_TRUE_LABEL if the result is one. */
357 extern void do_jump (tree
, rtx
, rtx
, int);
358 extern void do_jump_1 (enum tree_code
, tree
, tree
, rtx
, rtx
, int);
360 extern void do_compare_rtx_and_jump (rtx
, rtx
, enum rtx_code
, int,
361 machine_mode
, rtx
, rtx
, rtx
, int);
363 /* Two different ways of generating switch statements. */
364 extern int try_casesi (tree
, tree
, tree
, tree
, rtx
, rtx
, rtx
, int);
365 extern int try_tablejump (tree
, tree
, tree
, tree
, rtx
, rtx
, int);
367 /* Functions from alias.c */
371 /* rtl.h and tree.h were included. */
372 /* Return an rtx for the size in bytes of the value of an expr. */
373 extern rtx
expr_size (tree
);
375 /* Return a wide integer for the size in bytes of the value of EXP, or -1
376 if the size can vary or is larger than an integer. */
377 extern HOST_WIDE_INT
int_expr_size (tree
);
379 /* Return an rtx that refers to the value returned by a function
380 in its original home. This becomes invalid if any more code is emitted. */
381 extern rtx
hard_function_value (const_tree
, const_tree
, const_tree
, int);
383 extern rtx
prepare_call_address (tree
, rtx
, rtx
, rtx
*, int, int);
385 extern bool shift_return_value (machine_mode
, bool, rtx
);
387 extern rtx
expand_call (tree
, rtx
, int);
389 extern void fixup_tail_calls (void);
392 extern rtx
expand_variable_shift (enum tree_code
, machine_mode
,
393 rtx
, tree
, rtx
, int);
394 extern rtx
expand_shift (enum tree_code
, machine_mode
, rtx
, int, rtx
,
396 extern rtx
expand_divmod (int, enum tree_code
, machine_mode
, rtx
, rtx
,
400 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
401 extern rtx
label_rtx (tree
);
403 /* As label_rtx, but additionally the label is placed on the forced label
404 list of its containing function (i.e. it is treated as reachable even
405 if how is not obvious). */
406 extern rtx
force_label_rtx (tree
);
408 /* Return an rtx like arg but sans any constant terms.
409 Returns the original rtx if it has no constant terms.
410 The constant terms are added and stored via a second arg. */
411 extern rtx
eliminate_constant_term (rtx
, rtx
*);
413 /* Convert arg to a valid memory address for specified machine mode that points
414 to a specific named address space, by emitting insns to perform arithmetic
416 extern rtx
memory_address_addr_space (machine_mode
, rtx
, addr_space_t
);
418 /* Like memory_address_addr_space, except assume the memory address points to
419 the generic named address space. */
420 #define memory_address(MODE,RTX) \
421 memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC)
423 /* Return a memory reference like MEMREF, but with its mode changed
424 to MODE and its address changed to ADDR.
425 (VOIDmode means don't change the mode.
426 NULL for ADDR means don't change the address.) */
427 extern rtx
change_address (rtx
, machine_mode
, rtx
);
429 /* Return a memory reference like MEMREF, but with its mode changed
430 to MODE and its address offset by OFFSET bytes. */
431 #define adjust_address(MEMREF, MODE, OFFSET) \
432 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 0, 0)
434 /* Likewise, but the reference is not required to be valid. */
435 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
436 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1, 0, 0)
438 /* Return a memory reference like MEMREF, but with its mode changed
439 to MODE and its address offset by OFFSET bytes. Assume that it's
440 for a bitfield and conservatively drop the underlying object if we
441 cannot be sure to stay within its bounds. */
442 #define adjust_bitfield_address(MEMREF, MODE, OFFSET) \
443 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 1, 0)
445 /* As for adjust_bitfield_address, but specify that the width of
446 BLKmode accesses is SIZE bytes. */
447 #define adjust_bitfield_address_size(MEMREF, MODE, OFFSET, SIZE) \
448 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 1, SIZE)
450 /* Likewise, but the reference is not required to be valid. */
451 #define adjust_bitfield_address_nv(MEMREF, MODE, OFFSET) \
452 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1, 1, 0)
454 /* Return a memory reference like MEMREF, but with its mode changed
455 to MODE and its address changed to ADDR, which is assumed to be
456 increased by OFFSET bytes from MEMREF. */
457 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
458 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
460 /* Likewise, but the reference is not required to be valid. */
461 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
462 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
464 extern rtx
adjust_address_1 (rtx
, machine_mode
, HOST_WIDE_INT
, int, int,
466 extern rtx
adjust_automodify_address_1 (rtx
, machine_mode
, rtx
,
469 /* Return a memory reference like MEMREF, but whose address is changed by
470 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
471 known to be in OFFSET (possibly 1). */
472 extern rtx
offset_address (rtx
, rtx
, unsigned HOST_WIDE_INT
);
474 /* Definitions from emit-rtl.c */
475 #include "emit-rtl.h"
477 /* Return a memory reference like MEMREF, but with its mode widened to
478 MODE and adjusted by OFFSET. */
479 extern rtx
widen_memory_access (rtx
, machine_mode
, HOST_WIDE_INT
);
481 /* Return a memory reference like MEMREF, but which is known to have a
483 extern rtx
validize_mem (rtx
);
485 extern rtx
use_anchored_address (rtx
);
487 /* Given REF, a MEM, and T, either the type of X or the expression
488 corresponding to REF, set the memory attributes. OBJECTP is nonzero
489 if we are making a new object of this type. */
490 extern void set_mem_attributes (rtx
, tree
, int);
492 /* Similar, except that BITPOS has not yet been applied to REF, so if
493 we alter MEM_OFFSET according to T then we should subtract BITPOS
494 expecting that it'll be added back in later. */
495 extern void set_mem_attributes_minus_bitpos (rtx
, tree
, int, HOST_WIDE_INT
);
497 /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN
498 bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or
500 extern int get_mem_align_offset (rtx
, unsigned int);
502 /* Assemble the static constant template for function entry trampolines. */
503 extern rtx
assemble_trampoline_template (void);
505 /* Copy given rtx to a new temp reg and return that. */
506 extern rtx
copy_to_reg (rtx
);
508 /* Like copy_to_reg but always make the reg Pmode. */
509 extern rtx
copy_addr_to_reg (rtx
);
511 /* Like copy_to_reg but always make the reg the specified mode MODE. */
512 extern rtx
copy_to_mode_reg (machine_mode
, rtx
);
514 /* Copy given rtx to given temp reg and return that. */
515 extern rtx
copy_to_suggested_reg (rtx
, rtx
, machine_mode
);
517 /* Copy a value to a register if it isn't already a register.
518 Args are mode (in case value is a constant) and the value. */
519 extern rtx
force_reg (machine_mode
, rtx
);
521 /* Return given rtx, copied into a new temp reg if it was in memory. */
522 extern rtx
force_not_mem (rtx
);
524 /* Return mode and signedness to use when an argument or result in the
525 given mode is promoted. */
526 extern machine_mode
promote_function_mode (const_tree
, machine_mode
, int *,
529 /* Return mode and signedness to use when an object in the given mode
531 extern machine_mode
promote_mode (const_tree
, machine_mode
, int *);
533 /* Return mode and signedness to use when object is promoted. */
534 machine_mode
promote_decl_mode (const_tree
, int *);
536 /* Remove some bytes from the stack. An rtx says how many. */
537 extern void adjust_stack (rtx
);
539 /* Add some bytes to the stack. An rtx says how many. */
540 extern void anti_adjust_stack (rtx
);
542 /* Add some bytes to the stack while probing it. An rtx says how many. */
543 extern void anti_adjust_stack_and_probe (rtx
, bool);
545 /* This enum is used for the following two functions. */
546 enum save_level
{SAVE_BLOCK
, SAVE_FUNCTION
, SAVE_NONLOCAL
};
548 /* Save the stack pointer at the specified level. */
549 extern void emit_stack_save (enum save_level
, rtx
*);
551 /* Restore the stack pointer from a save area of the specified level. */
552 extern void emit_stack_restore (enum save_level
, rtx
);
554 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */
555 extern void update_nonlocal_goto_save_area (void);
557 /* Allocate some space on the stack dynamically and return its address. */
558 extern rtx
allocate_dynamic_stack_space (rtx
, unsigned, unsigned, bool);
560 /* Emit one stack probe at ADDRESS, an address within the stack. */
561 extern void emit_stack_probe (rtx
);
563 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
564 FIRST is a constant and size is a Pmode RTX. These are offsets from
565 the current stack pointer. STACK_GROWS_DOWNWARD says whether to add
566 or subtract them from the stack pointer. */
567 extern void probe_stack_range (HOST_WIDE_INT
, rtx
);
569 /* Return an rtx that refers to the value returned by a library call
570 in its original home. This becomes invalid if any more code is emitted. */
571 extern rtx
hard_libcall_value (machine_mode
, rtx
);
573 extern void store_bit_field (rtx
, unsigned HOST_WIDE_INT
,
574 unsigned HOST_WIDE_INT
,
575 unsigned HOST_WIDE_INT
,
576 unsigned HOST_WIDE_INT
,
578 extern rtx
extract_bit_field (rtx
, unsigned HOST_WIDE_INT
,
579 unsigned HOST_WIDE_INT
, int, rtx
,
580 machine_mode
, machine_mode
);
581 extern rtx
extract_low_bits (machine_mode
, machine_mode
, rtx
);
582 extern rtx
expand_mult (machine_mode
, rtx
, rtx
, rtx
, int);
583 extern rtx
expand_mult_highpart_adjust (machine_mode
, rtx
, rtx
, rtx
, rtx
, int);
585 extern rtx
assemble_static_space (unsigned HOST_WIDE_INT
);
586 extern int safe_from_p (const_rtx
, tree
, int);
587 extern bool split_comparison (enum rtx_code
, machine_mode
,
588 enum rtx_code
*, enum rtx_code
*);
590 /* Get the personality libfunc for a function decl. */
591 rtx
get_personality_function (tree
);
596 /* Expand a GIMPLE_SWITCH statement. */
597 extern void expand_case (gimple
);
599 /* Like expand_case but special-case for SJLJ exception dispatching. */
600 extern void expand_sjlj_dispatch_table (rtx
, vec
<tree
> );
602 /* Determine whether the LEN bytes can be moved by using several move
603 instructions. Return nonzero if a call to move_by_pieces should
605 extern int can_move_by_pieces (unsigned HOST_WIDE_INT
, unsigned int);
607 extern unsigned HOST_WIDE_INT
highest_pow2_factor (const_tree
);
608 bool array_at_struct_end_p (tree
);
610 /* Return a tree of sizetype representing the size, in bytes, of the element
611 of EXP, an ARRAY_REF or an ARRAY_RANGE_REF. */
612 extern tree
array_ref_element_size (tree
);
614 extern bool categorize_ctor_elements (const_tree
, HOST_WIDE_INT
*,
615 HOST_WIDE_INT
*, bool *);
617 /* Return a tree representing the offset, in bytes, of the field referenced
618 by EXP. This does not include any offset in DECL_FIELD_BIT_OFFSET. */
619 extern tree
component_ref_field_offset (tree
);
621 #endif /* GCC_EXPR_H */