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, 2010
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 /* This is the 4th arg to `expand_expr'.
38 EXPAND_STACK_PARM means we are possibly expanding a call param onto
40 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
41 EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
42 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
43 is a constant that is not a legitimate address.
44 EXPAND_WRITE means we are only going to write to the resulting rtx.
45 EXPAND_MEMORY means we are interested in a memory result, even if
46 the memory is constant and we could have propagated a constant value. */
47 enum expand_modifier
{EXPAND_NORMAL
= 0, EXPAND_STACK_PARM
, EXPAND_SUM
,
48 EXPAND_CONST_ADDRESS
, EXPAND_INITIALIZER
, EXPAND_WRITE
,
51 /* Prevent the compiler from deferring stack pops. See
52 inhibit_defer_pop for more information. */
53 #define NO_DEFER_POP (inhibit_defer_pop += 1)
55 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for
57 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
59 enum direction
{none
, upward
, downward
};
61 /* Structure to record the size of a sequence of arguments
62 as the sum of a tree-expression and a constant. This structure is
63 also used to store offsets from the stack, which might be negative,
64 so the variable part must be ssizetype, not sizetype. */
68 HOST_WIDE_INT constant
;
72 /* Package up various arg related fields of struct args for
73 locate_and_pad_parm. */
74 struct locate_and_pad_arg_data
76 /* Size of this argument on the stack, rounded up for any padding it
77 gets. If REG_PARM_STACK_SPACE is defined, then register parms are
78 counted here, otherwise they aren't. */
79 struct args_size size
;
80 /* Offset of this argument from beginning of stack-args. */
81 struct args_size offset
;
82 /* Offset to the start of the stack slot. Different from OFFSET
83 if this arg pads downward. */
84 struct args_size slot_offset
;
85 /* The amount that the stack pointer needs to be adjusted to
86 force alignment for the next argument. */
87 struct args_size alignment_pad
;
88 /* Which way we should pad this arg. */
89 enum direction where_pad
;
90 /* slot_offset is at least this aligned. */
91 unsigned int boundary
;
94 /* Add the value of the tree INC to the `struct args_size' TO. */
96 #define ADD_PARM_SIZE(TO, INC) \
99 if (host_integerp (inc, 0)) \
100 (TO).constant += tree_low_cst (inc, 0); \
101 else if ((TO).var == 0) \
102 (TO).var = fold_convert (ssizetype, inc); \
104 (TO).var = size_binop (PLUS_EXPR, (TO).var, \
105 fold_convert (ssizetype, inc)); \
108 #define SUB_PARM_SIZE(TO, DEC) \
111 if (host_integerp (dec, 0)) \
112 (TO).constant -= tree_low_cst (dec, 0); \
113 else if ((TO).var == 0) \
114 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \
115 fold_convert (ssizetype, dec)); \
117 (TO).var = size_binop (MINUS_EXPR, (TO).var, \
118 fold_convert (ssizetype, dec)); \
121 /* Convert the implicit sum in a `struct args_size' into a tree
122 of type ssizetype. */
123 #define ARGS_SIZE_TREE(SIZE) \
124 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \
125 : size_binop (PLUS_EXPR, fold_convert (ssizetype, (SIZE).var), \
126 ssize_int ((SIZE).constant)))
128 /* Convert the implicit sum in a `struct args_size' into an rtx. */
129 #define ARGS_SIZE_RTX(SIZE) \
130 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
131 : expand_normal (ARGS_SIZE_TREE (SIZE)))
134 /* This structure is used to pass around information about exploded
135 unary, binary and trinary expressions between expand_expr_real_1 and
137 typedef struct separate_ops
145 /* Functions from optabs.c, commonly used, and without need for the optabs
148 /* Passed to expand_simple_binop and expand_binop to say which options
149 to try to use if the requested operation can't be open-coded on the
150 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
151 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
152 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
153 try anything else. */
164 /* Generate code for a simple binary or unary operation. "Simple" in
165 this case means "can be unambiguously described by a (mode, code)
166 pair and mapped to a single optab." */
167 extern rtx
expand_simple_binop (enum machine_mode
, enum rtx_code
, rtx
,
168 rtx
, rtx
, int, enum optab_methods
);
169 extern rtx
expand_simple_unop (enum machine_mode
, enum rtx_code
, rtx
, rtx
,
172 /* Report whether the machine description contains an insn which can
173 perform the operation described by CODE and MODE. */
174 extern int have_insn_for (enum rtx_code
, enum machine_mode
);
176 /* Emit code to make a call to a constant function or a library call. */
177 extern void emit_libcall_block (rtx
, rtx
, rtx
, rtx
);
179 /* Create but don't emit one rtl instruction to perform certain operations.
180 Modes must match; operands must meet the operation's predicates.
181 Likewise for subtraction and for just copying. */
182 extern rtx
gen_add2_insn (rtx
, rtx
);
183 extern rtx
gen_add3_insn (rtx
, rtx
, rtx
);
184 extern rtx
gen_sub2_insn (rtx
, rtx
);
185 extern rtx
gen_sub3_insn (rtx
, rtx
, rtx
);
186 extern rtx
gen_move_insn (rtx
, rtx
);
187 extern int have_add2_insn (rtx
, rtx
);
188 extern int have_sub2_insn (rtx
, rtx
);
190 /* Emit a pair of rtl insns to compare two rtx's and to jump
191 to a label if the comparison is true. */
192 extern void emit_cmp_and_jump_insns (rtx
, rtx
, enum rtx_code
, rtx
,
193 enum machine_mode
, int, rtx
);
195 /* Generate code to indirectly jump to a location given in the rtx LOC. */
196 extern void emit_indirect_jump (rtx
);
198 /* Generate a conditional trap instruction. */
199 extern rtx
gen_cond_trap (enum rtx_code
, rtx
, rtx
, rtx
);
201 #include "insn-config.h"
203 #ifdef HAVE_conditional_move
204 /* Emit a conditional move operation. */
205 rtx
emit_conditional_move (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
206 rtx
, rtx
, enum machine_mode
, int);
208 /* Return nonzero if the conditional move is supported. */
209 int can_conditionally_move_p (enum machine_mode mode
);
212 rtx
emit_conditional_add (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
213 rtx
, rtx
, enum machine_mode
, int);
215 rtx
expand_sync_operation (rtx
, rtx
, enum rtx_code
);
216 rtx
expand_sync_fetch_operation (rtx
, rtx
, enum rtx_code
, bool, rtx
);
217 rtx
expand_sync_lock_test_and_set (rtx
, rtx
, rtx
);
219 rtx
expand_atomic_exchange (rtx
, rtx
, rtx
, enum memmodel
);
220 rtx
expand_atomic_load (rtx
, rtx
, enum memmodel
);
221 rtx
expand_atomic_store (rtx
, rtx
, enum memmodel
, bool);
222 rtx
expand_atomic_fetch_op (rtx
, rtx
, rtx
, enum rtx_code
, enum memmodel
,
224 rtx
expand_atomic_test_and_set (rtx
, rtx
, enum memmodel
);
225 rtx
expand_atomic_clear (rtx
, enum memmodel
);
226 void expand_atomic_thread_fence (enum memmodel
);
227 void expand_atomic_signal_fence (enum memmodel
);
230 /* Functions from expmed.c: */
232 /* Arguments MODE, RTX: return an rtx for the negation of that value.
234 extern rtx
negate_rtx (enum machine_mode
, rtx
);
236 /* Expand a logical AND operation. */
237 extern rtx
expand_and (enum machine_mode
, rtx
, rtx
, rtx
);
239 /* Emit a store-flag operation. */
240 extern rtx
emit_store_flag (rtx
, enum rtx_code
, rtx
, rtx
, enum machine_mode
,
243 /* Like emit_store_flag, but always succeeds. */
244 extern rtx
emit_store_flag_force (rtx
, enum rtx_code
, rtx
, rtx
,
245 enum machine_mode
, int, int);
247 /* Choose a minimal N + 1 bit approximation to 1/D that can be used to
248 replace division by D, and put the least significant N bits of the result
249 in *MULTIPLIER_PTR and return the most significant bit. */
250 extern unsigned HOST_WIDE_INT
choose_multiplier (unsigned HOST_WIDE_INT
, int,
251 int, unsigned HOST_WIDE_INT
*,
254 /* Functions from builtins.c: */
255 extern rtx
expand_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
256 extern tree
std_build_builtin_va_list (void);
257 extern tree
std_fn_abi_va_list (tree
);
258 extern tree
std_canonical_va_list_type (tree
);
260 extern void std_expand_builtin_va_start (tree
, rtx
);
261 extern rtx
default_expand_builtin (tree
, rtx
, rtx
, enum machine_mode
, int);
262 extern void expand_builtin_setjmp_setup (rtx
, rtx
);
263 extern void expand_builtin_setjmp_receiver (rtx
);
264 extern rtx
expand_builtin_saveregs (void);
265 extern void expand_builtin_trap (void);
266 extern rtx
builtin_strncpy_read_str (void *, HOST_WIDE_INT
, enum machine_mode
);
268 /* Functions from expr.c: */
270 /* This is run during target initialization to set up which modes can be
271 used directly in memory and to initialize the block move optab. */
272 extern void init_expr_target (void);
274 /* This is run at the start of compiling a function. */
275 extern void init_expr (void);
277 /* Emit some rtl insns to move data between rtx's, converting machine modes.
278 Both modes must be floating or both fixed. */
279 extern void convert_move (rtx
, rtx
, int);
281 /* Convert an rtx to specified machine mode and return the result. */
282 extern rtx
convert_to_mode (enum machine_mode
, rtx
, int);
284 /* Convert an rtx to MODE from OLDMODE and return the result. */
285 extern rtx
convert_modes (enum machine_mode
, enum machine_mode
, rtx
, int);
287 /* Emit code to move a block Y to a block X. */
289 enum block_op_methods
294 /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */
298 extern GTY(()) tree block_clear_fn
;
299 extern void init_block_move_fn (const char *);
300 extern void init_block_clear_fn (const char *);
302 extern rtx
emit_block_move (rtx
, rtx
, rtx
, enum block_op_methods
);
303 extern rtx
emit_block_move_via_libcall (rtx
, rtx
, rtx
, bool);
304 extern rtx
emit_block_move_hints (rtx
, rtx
, rtx
, enum block_op_methods
,
305 unsigned int, 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 /* Copy BLKmode object from a set of registers. */
338 extern rtx
copy_blkmode_from_reg (rtx
, rtx
, tree
);
340 /* Mark REG as holding a parameter for the next CALL_INSN.
341 Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode. */
342 extern void use_reg_mode (rtx
*, rtx
, enum machine_mode
);
344 extern rtx
copy_blkmode_to_reg (enum machine_mode
, tree
);
346 /* Mark REG as holding a parameter for the next CALL_INSN. */
348 use_reg (rtx
*fusage
, rtx reg
)
350 use_reg_mode (fusage
, reg
, VOIDmode
);
353 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
354 for the next CALL_INSN. */
355 extern void use_regs (rtx
*, int, int);
357 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
358 extern void use_group_regs (rtx
*, rtx
);
360 /* Write zeros through the storage of OBJECT.
361 If OBJECT has BLKmode, SIZE is its length in bytes. */
362 extern rtx
clear_storage (rtx
, rtx
, enum block_op_methods
);
363 extern rtx
clear_storage_hints (rtx
, rtx
, enum block_op_methods
,
364 unsigned int, HOST_WIDE_INT
);
365 /* The same, but always output an library call. */
366 rtx
set_storage_via_libcall (rtx
, rtx
, rtx
, bool);
368 /* Expand a setmem pattern; return true if successful. */
369 extern bool set_storage_via_setmem (rtx
, rtx
, rtx
, unsigned int,
370 unsigned int, HOST_WIDE_INT
);
372 extern unsigned HOST_WIDE_INT
move_by_pieces_ninsns (unsigned HOST_WIDE_INT
,
376 /* Return nonzero if it is desirable to store LEN bytes generated by
377 CONSTFUN with several move instructions by store_by_pieces
378 function. CONSTFUNDATA is a pointer which will be passed as argument
379 in every CONSTFUN call.
380 ALIGN is maximum alignment we can assume.
381 MEMSETP is true if this is a real memset/bzero, not a copy
382 of a const string. */
383 extern int can_store_by_pieces (unsigned HOST_WIDE_INT
,
384 rtx (*) (void *, HOST_WIDE_INT
,
386 void *, unsigned int, bool);
388 /* Generate several move instructions to store LEN bytes generated by
389 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
390 pointer which will be passed as argument in every CONSTFUN call.
391 ALIGN is maximum alignment we can assume.
392 MEMSETP is true if this is a real memset/bzero, not a copy.
394 extern rtx
store_by_pieces (rtx
, unsigned HOST_WIDE_INT
,
395 rtx (*) (void *, HOST_WIDE_INT
, enum machine_mode
),
396 void *, unsigned int, bool, int);
398 /* Emit insns to set X from Y. */
399 extern rtx
emit_move_insn (rtx
, rtx
);
401 /* Emit insns to set X from Y, with no frills. */
402 extern rtx
emit_move_insn_1 (rtx
, rtx
);
404 extern rtx
emit_move_complex_push (enum machine_mode
, rtx
, rtx
);
405 extern rtx
emit_move_complex_parts (rtx
, rtx
);
407 /* Push a block of length SIZE (perhaps variable)
408 and return an rtx to address the beginning of the block. */
409 extern rtx
push_block (rtx
, int, int);
411 /* Generate code to push something onto the stack, given its mode and type. */
412 extern void emit_push_insn (rtx
, enum machine_mode
, tree
, rtx
, unsigned int,
413 int, rtx
, int, rtx
, rtx
, int, rtx
);
415 /* Expand an assignment that stores the value of FROM into TO. */
416 extern void expand_assignment (tree
, tree
, bool);
418 /* Generate code for computing expression EXP,
419 and storing the value into TARGET.
420 If SUGGEST_REG is nonzero, copy the value through a register
421 and return that register, if that is possible. */
422 extern rtx
store_expr (tree
, rtx
, int, bool);
424 /* Given an rtx that may include add and multiply operations,
425 generate them as insns and return a pseudo-reg containing the value.
426 Useful after calling expand_expr with 1 as sum_ok. */
427 extern rtx
force_operand (rtx
, rtx
);
429 /* Work horses for expand_expr. */
430 extern rtx
expand_expr_real (tree
, rtx
, enum machine_mode
,
431 enum expand_modifier
, rtx
*);
432 extern rtx
expand_expr_real_1 (tree
, rtx
, enum machine_mode
,
433 enum expand_modifier
, rtx
*);
434 extern rtx
expand_expr_real_2 (sepops
, rtx
, enum machine_mode
,
435 enum expand_modifier
);
437 /* Generate code for computing expression EXP.
438 An rtx for the computed value is returned. The value is never null.
439 In the case of a void EXP, const0_rtx is returned. */
441 expand_expr (tree exp
, rtx target
, enum machine_mode mode
,
442 enum expand_modifier modifier
)
444 return expand_expr_real (exp
, target
, mode
, modifier
, NULL
);
448 expand_normal (tree exp
)
450 return expand_expr_real (exp
, NULL_RTX
, VOIDmode
, EXPAND_NORMAL
, NULL
);
453 /* At the start of a function, record that we have no previously-pushed
454 arguments waiting to be popped. */
455 extern void init_pending_stack_adjust (void);
457 /* Discard any pending stack adjustment. */
458 extern void discard_pending_stack_adjust (void);
460 /* When exiting from function, if safe, clear out any pending stack adjust
461 so the adjustment won't get done. */
462 extern void clear_pending_stack_adjust (void);
464 /* Pop any previously-pushed arguments that have not been popped yet. */
465 extern void do_pending_stack_adjust (void);
467 /* Return the tree node and offset if a given argument corresponds to
468 a string constant. */
469 extern tree
string_constant (tree
, tree
*);
471 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
472 extern void jumpifnot (tree
, rtx
, int);
473 extern void jumpifnot_1 (enum tree_code
, tree
, tree
, rtx
, int);
475 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
476 extern void jumpif (tree
, rtx
, int);
477 extern void jumpif_1 (enum tree_code
, tree
, tree
, rtx
, int);
479 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
480 the result is zero, or IF_TRUE_LABEL if the result is one. */
481 extern void do_jump (tree
, rtx
, rtx
, int);
482 extern void do_jump_1 (enum tree_code
, tree
, tree
, rtx
, rtx
, int);
484 extern void do_compare_rtx_and_jump (rtx
, rtx
, enum rtx_code
, int,
485 enum machine_mode
, rtx
, rtx
, rtx
, int);
487 /* Two different ways of generating switch statements. */
488 extern int try_casesi (tree
, tree
, tree
, tree
, rtx
, rtx
, rtx
);
489 extern int try_tablejump (tree
, tree
, tree
, tree
, rtx
, rtx
);
491 /* Functions from alias.c */
495 /* rtl.h and tree.h were included. */
496 /* Return an rtx for the size in bytes of the value of an expr. */
497 extern rtx
expr_size (tree
);
499 /* Return a wide integer for the size in bytes of the value of EXP, or -1
500 if the size can vary or is larger than an integer. */
501 extern HOST_WIDE_INT
int_expr_size (tree
);
503 /* Return an rtx that refers to the value returned by a function
504 in its original home. This becomes invalid if any more code is emitted. */
505 extern rtx
hard_function_value (const_tree
, const_tree
, const_tree
, int);
507 extern rtx
prepare_call_address (tree
, rtx
, rtx
, rtx
*, int, int);
509 extern bool shift_return_value (enum machine_mode
, bool, rtx
);
511 extern rtx
expand_call (tree
, rtx
, int);
513 extern void fixup_tail_calls (void);
516 extern rtx
expand_variable_shift (enum tree_code
, enum machine_mode
,
517 rtx
, tree
, rtx
, int);
518 extern rtx
expand_shift (enum tree_code
, enum machine_mode
, rtx
, int, rtx
,
520 extern rtx
expand_divmod (int, enum tree_code
, enum machine_mode
, rtx
, rtx
,
524 extern void locate_and_pad_parm (enum machine_mode
, tree
, int, int, tree
,
526 struct locate_and_pad_arg_data
*);
528 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
529 extern rtx
label_rtx (tree
);
531 /* As label_rtx, but additionally the label is placed on the forced label
532 list of its containing function (i.e. it is treated as reachable even
533 if how is not obvious). */
534 extern rtx
force_label_rtx (tree
);
536 /* Return an rtx like arg but sans any constant terms.
537 Returns the original rtx if it has no constant terms.
538 The constant terms are added and stored via a second arg. */
539 extern rtx
eliminate_constant_term (rtx
, rtx
*);
541 /* Convert arg to a valid memory address for specified machine mode that points
542 to a specific named address space, by emitting insns to perform arithmetic
544 extern rtx
memory_address_addr_space (enum machine_mode
, rtx
, addr_space_t
);
546 /* Like memory_address_addr_space, except assume the memory address points to
547 the generic named address space. */
548 #define memory_address(MODE,RTX) \
549 memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC)
551 /* Return a memory reference like MEMREF, but with its mode changed
552 to MODE and its address changed to ADDR.
553 (VOIDmode means don't change the mode.
554 NULL for ADDR means don't change the address.) */
555 extern rtx
change_address (rtx
, enum machine_mode
, rtx
);
557 /* Return a memory reference like MEMREF, but with its mode changed
558 to MODE and its address offset by OFFSET bytes. */
559 #define adjust_address(MEMREF, MODE, OFFSET) \
560 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
562 /* Likewise, but the reference is not required to be valid. */
563 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
564 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
566 /* Return a memory reference like MEMREF, but with its mode changed
567 to MODE and its address changed to ADDR, which is assumed to be
568 increased by OFFSET bytes from MEMREF. */
569 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
570 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
572 /* Likewise, but the reference is not required to be valid. */
573 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
574 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
576 extern rtx
adjust_address_1 (rtx
, enum machine_mode
, HOST_WIDE_INT
, int, int);
577 extern rtx
adjust_automodify_address_1 (rtx
, enum machine_mode
, rtx
,
580 /* Return a memory reference like MEMREF, but whose address is changed by
581 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
582 known to be in OFFSET (possibly 1). */
583 extern rtx
offset_address (rtx
, rtx
, unsigned HOST_WIDE_INT
);
585 /* Definitions from emit-rtl.c */
586 #include "emit-rtl.h"
588 /* Return a memory reference like MEMREF, but with its mode widened to
589 MODE and adjusted by OFFSET. */
590 extern rtx
widen_memory_access (rtx
, enum machine_mode
, HOST_WIDE_INT
);
592 /* Return a memory reference like MEMREF, but which is known to have a
594 extern rtx
validize_mem (rtx
);
596 extern rtx
use_anchored_address (rtx
);
598 /* Given REF, a MEM, and T, either the type of X or the expression
599 corresponding to REF, set the memory attributes. OBJECTP is nonzero
600 if we are making a new object of this type. */
601 extern void set_mem_attributes (rtx
, tree
, int);
603 /* Similar, except that BITPOS has not yet been applied to REF, so if
604 we alter MEM_OFFSET according to T then we should subtract BITPOS
605 expecting that it'll be added back in later. */
606 extern void set_mem_attributes_minus_bitpos (rtx
, tree
, int, HOST_WIDE_INT
);
608 /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN
609 bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or
611 extern int get_mem_align_offset (rtx
, unsigned int);
613 /* Assemble the static constant template for function entry trampolines. */
614 extern rtx
assemble_trampoline_template (void);
616 /* Copy given rtx to a new temp reg and return that. */
617 extern rtx
copy_to_reg (rtx
);
619 /* Like copy_to_reg but always make the reg Pmode. */
620 extern rtx
copy_addr_to_reg (rtx
);
622 /* Like copy_to_reg but always make the reg the specified mode MODE. */
623 extern rtx
copy_to_mode_reg (enum machine_mode
, rtx
);
625 /* Copy given rtx to given temp reg and return that. */
626 extern rtx
copy_to_suggested_reg (rtx
, rtx
, enum machine_mode
);
628 /* Copy a value to a register if it isn't already a register.
629 Args are mode (in case value is a constant) and the value. */
630 extern rtx
force_reg (enum machine_mode
, rtx
);
632 /* Return given rtx, copied into a new temp reg if it was in memory. */
633 extern rtx
force_not_mem (rtx
);
635 /* Return mode and signedness to use when an argument or result in the
636 given mode is promoted. */
637 extern enum machine_mode
promote_function_mode (const_tree
, enum machine_mode
, int *,
640 /* Return mode and signedness to use when an object in the given mode
642 extern enum machine_mode
promote_mode (const_tree
, enum machine_mode
, int *);
644 /* Return mode and signedness to use when object is promoted. */
645 enum machine_mode
promote_decl_mode (const_tree
, int *);
647 /* Remove some bytes from the stack. An rtx says how many. */
648 extern void adjust_stack (rtx
);
650 /* Add some bytes to the stack. An rtx says how many. */
651 extern void anti_adjust_stack (rtx
);
653 /* Add some bytes to the stack while probing it. An rtx says how many. */
654 extern void anti_adjust_stack_and_probe (rtx
, bool);
656 /* This enum is used for the following two functions. */
657 enum save_level
{SAVE_BLOCK
, SAVE_FUNCTION
, SAVE_NONLOCAL
};
659 /* Save the stack pointer at the specified level. */
660 extern void emit_stack_save (enum save_level
, rtx
*);
662 /* Restore the stack pointer from a save area of the specified level. */
663 extern void emit_stack_restore (enum save_level
, rtx
);
665 /* Invoke emit_stack_save for the nonlocal_goto_save_area. */
666 extern void update_nonlocal_goto_save_area (void);
668 /* Allocate some space on the stack dynamically and return its address. */
669 extern rtx
allocate_dynamic_stack_space (rtx
, unsigned, unsigned, bool);
671 /* Emit one stack probe at ADDRESS, an address within the stack. */
672 extern void emit_stack_probe (rtx
);
674 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
675 FIRST is a constant and size is a Pmode RTX. These are offsets from
676 the current stack pointer. STACK_GROWS_DOWNWARD says whether to add
677 or subtract them from the stack pointer. */
678 extern void probe_stack_range (HOST_WIDE_INT
, rtx
);
680 /* Return an rtx that refers to the value returned by a library call
681 in its original home. This becomes invalid if any more code is emitted. */
682 extern rtx
hard_libcall_value (enum machine_mode
, rtx
);
684 /* Return the mode desired by operand N of a particular bitfield
685 insert/extract insn, or MAX_MACHINE_MODE if no such insn is
688 enum extraction_pattern
{ EP_insv
, EP_extv
, EP_extzv
};
689 extern enum machine_mode
690 mode_for_extraction (enum extraction_pattern
, int);
692 extern void store_bit_field (rtx
, unsigned HOST_WIDE_INT
,
693 unsigned HOST_WIDE_INT
,
694 unsigned HOST_WIDE_INT
,
695 unsigned HOST_WIDE_INT
,
696 enum machine_mode
, rtx
);
697 extern rtx
extract_bit_field (rtx
, unsigned HOST_WIDE_INT
,
698 unsigned HOST_WIDE_INT
, int, bool, rtx
,
699 enum machine_mode
, enum machine_mode
);
700 extern rtx
extract_low_bits (enum machine_mode
, enum machine_mode
, rtx
);
701 extern rtx
expand_mult (enum machine_mode
, rtx
, rtx
, rtx
, int);
702 extern rtx
expand_mult_highpart_adjust (enum machine_mode
, rtx
, rtx
, rtx
, rtx
, int);
704 extern rtx
assemble_static_space (unsigned HOST_WIDE_INT
);
705 extern int safe_from_p (const_rtx
, tree
, int);
706 extern bool split_comparison (enum rtx_code
, enum machine_mode
,
707 enum rtx_code
*, enum rtx_code
*);
709 /* Call this once to initialize the contents of the optabs
710 appropriately for the current target machine. */
711 extern void init_optabs (void);
712 extern void init_all_optabs (void);
714 /* Call this to initialize an optab function entry. */
715 extern rtx
init_one_libfunc (const char *);
716 extern rtx
set_user_assembler_libfunc (const char *, const char *);
718 /* Build a decl for a libfunc named NAME. */
719 extern tree
build_libfunc_function (const char *);
721 /* Get the personality libfunc for a function decl. */
722 rtx
get_personality_function (tree
);
727 /* Expand a GIMPLE_SWITCH statement. */
728 extern void expand_case (gimple
);
730 /* Like expand_case but special-case for SJLJ exception dispatching. */
731 extern void expand_sjlj_dispatch_table (rtx
, VEC(tree
,heap
) *);
733 #endif /* GCC_EXPR_H */