1 /* Definitions for code generation pass of GNU compiler.
2 Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* The default branch cost is 1. */
27 /* Macros to access the slots of a QUEUED rtx.
28 Here rather than in rtl.h because only the expansion pass
29 should ever encounter a QUEUED. */
31 /* The variable for which an increment is queued. */
32 #define QUEUED_VAR(P) XEXP (P, 0)
33 /* If the increment has been emitted, this is the insn
34 that does the increment. It is zero before the increment is emitted.
35 If more than one insn is emitted, this is the first insn. */
36 #define QUEUED_INSN(P) XEXP (P, 1)
37 /* If a pre-increment copy has been generated, this is the copy
38 (it is a temporary reg). Zero if no copy made yet. */
39 #define QUEUED_COPY(P) XEXP (P, 2)
40 /* This is the body to use for the insn to do the increment.
41 It is used to emit the increment. */
42 #define QUEUED_BODY(P) XEXP (P, 3)
43 /* Next QUEUED in the queue. */
44 #define QUEUED_NEXT(P) XEXP (P, 4)
46 /* This is the 4th arg to `expand_expr'.
47 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
48 EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
49 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
50 is a constant that is not a legitimate address.
51 EXPAND_WRITE means we are only going to write to the resulting rtx. */
52 enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM, EXPAND_CONST_ADDRESS,
53 EXPAND_INITIALIZER, EXPAND_WRITE};
55 /* Prevent the compiler from deferring stack pops. See
56 inhibit_defer_pop for more information. */
57 #define NO_DEFER_POP (inhibit_defer_pop += 1)
59 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for
61 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
63 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
64 /* Structure to record the size of a sequence of arguments
65 as the sum of a tree-expression and a constant. This structure is
66 also used to store offsets from the stack, which might be negative,
67 so the variable part must be ssizetype, not sizetype. */
71 HOST_WIDE_INT constant;
76 /* Add the value of the tree INC to the `struct args_size' TO. */
78 #define ADD_PARM_SIZE(TO, INC) \
80 if (host_integerp (inc, 0)) \
81 (TO).constant += tree_low_cst (inc, 0); \
82 else if ((TO).var == 0) \
85 (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
87 #define SUB_PARM_SIZE(TO, DEC) \
89 if (host_integerp (dec, 0)) \
90 (TO).constant -= tree_low_cst (dec, 0); \
91 else if ((TO).var == 0) \
92 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), dec); \
94 (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
96 /* Convert the implicit sum in a `struct args_size' into a tree
98 #define ARGS_SIZE_TREE(SIZE) \
99 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \
100 : size_binop (PLUS_EXPR, convert (ssizetype, (SIZE).var), \
101 ssize_int ((SIZE).constant)))
103 /* Convert the implicit sum in a `struct args_size' into an rtx. */
104 #define ARGS_SIZE_RTX(SIZE) \
105 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
106 : expand_expr (ARGS_SIZE_TREE (SIZE), NULL_RTX, VOIDmode, 0))
108 /* Supply a default definition for FUNCTION_ARG_PADDING:
109 usually pad upward, but pad short args downward on
110 big-endian machines. */
112 enum direction {none, upward, downward}; /* Value has this type. */
114 #ifndef FUNCTION_ARG_PADDING
115 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
116 (! BYTES_BIG_ENDIAN \
118 : (((MODE) == BLKmode \
119 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
120 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
121 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
122 ? downward : upward))
125 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
126 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
129 #ifndef FUNCTION_ARG_BOUNDARY
130 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
133 /* Provide a default value for STRICT_ARGUMENT_NAMING. */
134 #ifndef STRICT_ARGUMENT_NAMING
135 #define STRICT_ARGUMENT_NAMING 0
138 /* Provide a default value for PRETEND_OUTGOING_VARARGS_NAMED. */
139 #ifdef SETUP_INCOMING_VARARGS
140 #ifndef PRETEND_OUTGOING_VARARGS_NAMED
141 #define PRETEND_OUTGOING_VARARGS_NAMED 1
144 /* It is an error to define PRETEND_OUTGOING_VARARGS_NAMED without
145 defining SETUP_INCOMING_VARARGS. */
146 #define PRETEND_OUTGOING_VARARGS_NAMED 0
149 /* Nonzero if we do not know how to pass TYPE solely in registers.
150 We cannot do so in the following cases:
152 - if the type has variable size
153 - if the type is marked as addressable (it is required to be constructed
155 - if the padding and mode of the type is such that a copy into a register
156 would put it into the wrong part of the register.
158 Which padding can't be supported depends on the byte endianness.
160 A value in a register is implicitly padded at the most significant end.
161 On a big-endian machine, that is the lower end in memory.
162 So a value padded in memory at the upper end can't go in a register.
163 For a little-endian machine, the reverse is true. */
165 #ifndef MUST_PASS_IN_STACK
166 #define MUST_PASS_IN_STACK(MODE,TYPE) \
168 && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
169 || TREE_ADDRESSABLE (TYPE) \
170 || ((MODE) == BLKmode \
171 && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
172 && 0 == (int_size_in_bytes (TYPE) \
173 % (PARM_BOUNDARY / BITS_PER_UNIT))) \
174 && (FUNCTION_ARG_PADDING (MODE, TYPE) \
175 == (BYTES_BIG_ENDIAN ? upward : downward)))))
178 /* Nonzero if type TYPE should be returned in memory.
179 Most machines can use the following default definition. */
181 #ifndef RETURN_IN_MEMORY
182 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
185 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
186 Normally move_insn, so Pmode stack pointer. */
188 #ifndef STACK_SAVEAREA_MODE
189 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
192 /* Supply a default definition of STACK_SIZE_MODE for
193 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
195 #ifndef STACK_SIZE_MODE
196 #define STACK_SIZE_MODE word_mode
199 /* Provide default values for the macros controlling stack checking. */
201 #ifndef STACK_CHECK_BUILTIN
202 #define STACK_CHECK_BUILTIN 0
205 /* The default interval is one page. */
206 #ifndef STACK_CHECK_PROBE_INTERVAL
207 #define STACK_CHECK_PROBE_INTERVAL 4096
210 /* The default is to do a store into the stack. */
211 #ifndef STACK_CHECK_PROBE_LOAD
212 #define STACK_CHECK_PROBE_LOAD 0
215 /* This value is arbitrary, but should be sufficient for most machines. */
216 #ifndef STACK_CHECK_PROTECT
217 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
220 /* Make the maximum frame size be the largest we can and still only need
221 one probe per function. */
222 #ifndef STACK_CHECK_MAX_FRAME_SIZE
223 #define STACK_CHECK_MAX_FRAME_SIZE \
224 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
227 /* This is arbitrary, but should be large enough everywhere. */
228 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
229 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
232 /* Provide a reasonable default for the maximum size of an object to
233 allocate in the fixed frame. We may need to be able to make this
234 controllable by the user at some point. */
235 #ifndef STACK_CHECK_MAX_VAR_SIZE
236 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
239 /* Functions from optabs.c, commonly used, and without need for the optabs
242 /* Passed to expand_simple_binop and expand_binop to say which options
243 to try to use if the requested operation can't be open-coded on the
244 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
245 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
246 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
247 try anything else. */
258 /* Generate code for a simple binary or unary operation. "Simple" in
259 this case means "can be unambiguously described by a (mode, code)
260 pair and mapped to a single optab." */
261 extern rtx expand_simple_binop PARAMS ((enum machine_mode, enum rtx_code, rtx,
262 rtx, rtx, int, enum optab_methods));
263 extern rtx expand_simple_unop PARAMS ((enum machine_mode, enum rtx_code,
266 /* Report whether the machine description contains an insn which can
267 perform the operation described by CODE and MODE. */
268 extern int have_insn_for PARAMS ((enum rtx_code, enum machine_mode));
270 /* Emit code to make a call to a constant function or a library call. */
271 extern void emit_libcall_block PARAMS ((rtx, rtx, rtx, rtx));
273 /* Create but don't emit one rtl instruction to perform certain operations.
274 Modes must match; operands must meet the operation's predicates.
275 Likewise for subtraction and for just copying.
276 These do not call protect_from_queue; caller must do so. */
277 extern rtx gen_add2_insn PARAMS ((rtx, rtx));
278 extern rtx gen_add3_insn PARAMS ((rtx, rtx, rtx));
279 extern rtx gen_sub2_insn PARAMS ((rtx, rtx));
280 extern rtx gen_sub3_insn PARAMS ((rtx, rtx, rtx));
281 extern rtx gen_move_insn PARAMS ((rtx, rtx));
282 extern int have_add2_insn PARAMS ((rtx, rtx));
283 extern int have_sub2_insn PARAMS ((rtx, rtx));
285 /* Emit a pair of rtl insns to compare two rtx's and to jump
286 to a label if the comparison is true. */
287 extern void emit_cmp_and_jump_insns PARAMS ((rtx, rtx, enum rtx_code, rtx,
288 enum machine_mode, int, rtx));
290 /* Generate code to indirectly jump to a location given in the rtx LOC. */
291 extern void emit_indirect_jump PARAMS ((rtx));
293 #ifdef HAVE_conditional_move
294 /* Emit a conditional move operation. */
295 rtx emit_conditional_move PARAMS ((rtx, enum rtx_code, rtx, rtx,
296 enum machine_mode, rtx, rtx,
297 enum machine_mode, int));
299 /* Return non-zero if the conditional move is supported. */
300 int can_conditionally_move_p PARAMS ((enum machine_mode mode));
305 /* Functions from expmed.c: */
307 /* Arguments MODE, RTX: return an rtx for the negation of that value.
309 extern rtx negate_rtx PARAMS ((enum machine_mode, rtx));
311 /* Expand a logical AND operation. */
312 extern rtx expand_and PARAMS ((enum machine_mode, rtx, rtx, rtx));
314 /* Emit a store-flag operation. */
315 extern rtx emit_store_flag PARAMS ((rtx, enum rtx_code, rtx, rtx,
316 enum machine_mode, int, int));
318 /* Like emit_store_flag, but always succeeds. */
319 extern rtx emit_store_flag_force PARAMS ((rtx, enum rtx_code, rtx, rtx,
320 enum machine_mode, int, int));
322 /* Functions from loop.c: */
324 /* Given an insn and condition, return a canonical description of
325 the test being made. */
326 extern rtx canonicalize_condition PARAMS ((rtx, rtx, int, rtx *, rtx));
328 /* Given a JUMP_INSN, return a canonical description of the test
330 extern rtx get_condition PARAMS ((rtx, rtx *));
332 /* Generate a conditional trap instruction. */
333 extern rtx gen_cond_trap PARAMS ((enum rtx_code, rtx, rtx, rtx));
335 /* Functions from builtins.c: */
337 extern rtx expand_builtin PARAMS ((tree, rtx, rtx, enum machine_mode, int));
338 extern void std_expand_builtin_va_start PARAMS ((int, tree, rtx));
339 extern rtx std_expand_builtin_va_arg PARAMS ((tree, tree));
340 extern rtx expand_builtin_va_arg PARAMS ((tree, tree));
341 extern void default_init_builtins PARAMS ((void));
342 extern rtx default_expand_builtin PARAMS ((tree, rtx, rtx,
343 enum machine_mode, int));
346 extern void expand_builtin_setjmp_setup PARAMS ((rtx, rtx));
347 extern void expand_builtin_setjmp_receiver PARAMS ((rtx));
348 extern void expand_builtin_longjmp PARAMS ((rtx, rtx));
349 extern rtx expand_builtin_saveregs PARAMS ((void));
350 extern HOST_WIDE_INT get_varargs_alias_set PARAMS ((void));
351 extern HOST_WIDE_INT get_frame_alias_set PARAMS ((void));
352 extern void record_base_value PARAMS ((unsigned int, rtx, int));
353 extern void record_alias_subset PARAMS ((HOST_WIDE_INT,
355 extern HOST_WIDE_INT new_alias_set PARAMS ((void));
356 extern int can_address_p PARAMS ((tree));
358 /* Functions from expr.c: */
360 /* This is run once per compilation to set up which modes can be used
361 directly in memory and to initialize the block move optab. */
362 extern void init_expr_once PARAMS ((void));
364 /* This is run at the start of compiling a function. */
365 extern void init_expr PARAMS ((void));
367 /* This function is run once to initialize stor-layout.c. */
369 extern void init_stor_layout_once PARAMS ((void));
371 /* This is run at the end of compiling a function. */
372 extern void finish_expr_for_function PARAMS ((void));
374 /* Use protect_from_queue to convert a QUEUED expression
375 into something that you can put immediately into an instruction. */
376 extern rtx protect_from_queue PARAMS ((rtx, int));
378 /* Perform all the pending incrementations. */
379 extern void emit_queue PARAMS ((void));
381 /* Tell if something has a queued subexpression. */
382 extern int queued_subexp_p PARAMS ((rtx));
384 /* Emit some rtl insns to move data between rtx's, converting machine modes.
385 Both modes must be floating or both fixed. */
386 extern void convert_move PARAMS ((rtx, rtx, int));
388 /* Convert an rtx to specified machine mode and return the result. */
389 extern rtx convert_to_mode PARAMS ((enum machine_mode, rtx, int));
391 /* Convert an rtx to MODE from OLDMODE and return the result. */
392 extern rtx convert_modes PARAMS ((enum machine_mode, enum machine_mode,
395 /* Emit code to move a block Y to a block X. */
396 extern rtx emit_block_move PARAMS ((rtx, rtx, rtx));
398 /* Copy all or part of a value X into registers starting at REGNO.
399 The number of registers to be filled is NREGS. */
400 extern void move_block_to_reg PARAMS ((int, rtx, int, enum machine_mode));
402 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
403 The number of registers to be filled is NREGS. */
404 extern void move_block_from_reg PARAMS ((int, rtx, int, int));
406 /* Load a BLKmode value into non-consecutive registers represented by a
408 extern void emit_group_load PARAMS ((rtx, rtx, int));
410 /* Store a BLKmode value from non-consecutive registers represented by a
412 extern void emit_group_store PARAMS ((rtx, rtx, int));
415 /* Copy BLKmode object from a set of registers. */
416 extern rtx copy_blkmode_from_reg PARAMS ((rtx,rtx,tree));
419 /* Mark REG as holding a parameter for the next CALL_INSN. */
420 extern void use_reg PARAMS ((rtx *, rtx));
422 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
423 for the next CALL_INSN. */
424 extern void use_regs PARAMS ((rtx *, int, int));
426 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
427 extern void use_group_regs PARAMS ((rtx *, rtx));
429 /* Write zeros through the storage of OBJECT.
430 If OBJECT has BLKmode, SIZE is its length in bytes. */
431 extern rtx clear_storage PARAMS ((rtx, rtx));
433 /* Return non-zero if it is desirable to store LEN bytes generated by
434 CONSTFUN with several move instructions by store_by_pieces
435 function. CONSTFUNDATA is a pointer which will be passed as argument
436 in every CONSTFUN call.
437 ALIGN is maximum alignment we can assume. */
438 extern int can_store_by_pieces PARAMS ((unsigned HOST_WIDE_INT,
439 rtx (*) (PTR, HOST_WIDE_INT,
443 /* Generate several move instructions to store LEN bytes generated by
444 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
445 pointer which will be passed as argument in every CONSTFUN call.
446 ALIGN is maximum alignment we can assume. */
447 extern void store_by_pieces PARAMS ((rtx, unsigned HOST_WIDE_INT,
448 rtx (*) (PTR, HOST_WIDE_INT,
452 /* Emit insns to set X from Y. */
453 extern rtx emit_move_insn PARAMS ((rtx, rtx));
455 /* Emit insns to set X from Y, with no frills. */
456 extern rtx emit_move_insn_1 PARAMS ((rtx, rtx));
458 /* Push a block of length SIZE (perhaps variable)
459 and return an rtx to address the beginning of the block. */
460 extern rtx push_block PARAMS ((rtx, int, int));
463 /* Generate code to push something onto the stack, given its mode and type. */
464 extern void emit_push_insn PARAMS ((rtx, enum machine_mode, tree, rtx,
465 unsigned int, int, rtx, int, rtx, rtx,
468 /* Expand an assignment that stores the value of FROM into TO. */
469 extern rtx expand_assignment PARAMS ((tree, tree, int, int));
471 /* Generate code for computing expression EXP,
472 and storing the value into TARGET.
473 If SUGGEST_REG is nonzero, copy the value through a register
474 and return that register, if that is possible. */
475 extern rtx store_expr PARAMS ((tree, rtx, int));
478 /* Given an rtx that may include add and multiply operations,
479 generate them as insns and return a pseudo-reg containing the value.
480 Useful after calling expand_expr with 1 as sum_ok. */
481 extern rtx force_operand PARAMS ((rtx, rtx));
483 /* Return an object on the placeholder list that matches EXP, a
484 PLACEHOLDER_EXPR. An object "matches" if it is of the type of the
485 PLACEHOLDER_EXPR or a pointer type to it. For further information, see
486 tree.def. If no such object is found, abort. If PLIST is nonzero, it is
487 a location which initially points to a starting location in the
488 placeholder list (zero means start of the list) and where a pointer into
489 the placeholder list at which the object is found is placed. */
490 extern tree find_placeholder PARAMS ((tree, tree *));
492 /* Generate code for computing expression EXP.
493 An rtx for the computed value is returned. The value is never null.
494 In the case of a void EXP, const0_rtx is returned. */
495 extern rtx expand_expr PARAMS ((tree, rtx, enum machine_mode,
496 enum expand_modifier));
498 /* At the start of a function, record that we have no previously-pushed
499 arguments waiting to be popped. */
500 extern void init_pending_stack_adjust PARAMS ((void));
502 /* When exiting from function, if safe, clear out any pending stack adjust
503 so the adjustment won't get done. */
504 extern void clear_pending_stack_adjust PARAMS ((void));
506 /* Pop any previously-pushed arguments that have not been popped yet. */
507 extern void do_pending_stack_adjust PARAMS ((void));
510 /* Return the tree node and offset if a given argument corresponds to
511 a string constant. */
512 extern tree string_constant PARAMS ((tree, tree *));
514 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
515 extern void jumpifnot PARAMS ((tree, rtx));
517 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
518 extern void jumpif PARAMS ((tree, rtx));
520 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
521 the result is zero, or IF_TRUE_LABEL if the result is one. */
522 extern void do_jump PARAMS ((tree, rtx, rtx));
525 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
526 extern rtx compare_from_rtx PARAMS ((rtx, rtx, enum rtx_code, int,
527 enum machine_mode, rtx));
528 extern void do_compare_rtx_and_jump PARAMS ((rtx, rtx, enum rtx_code, int,
529 enum machine_mode, rtx,
532 /* Two different ways of generating switch statements. */
533 extern int try_casesi PARAMS ((tree, tree, tree, tree, rtx, rtx));
534 extern int try_tablejump PARAMS ((tree, tree, tree, tree, rtx, rtx));
536 /* Smallest number of adjacent cases before we use a jump table.
537 XXX Should be a target hook. */
538 extern unsigned int case_values_threshold PARAMS ((void));
542 /* rtl.h and tree.h were included. */
543 /* Return an rtx for the size in bytes of the value of an expr. */
544 extern rtx expr_size PARAMS ((tree));
546 extern rtx lookup_static_chain PARAMS ((tree));
548 /* Convert a stack slot address ADDR valid in function FNDECL
549 into an address valid in this function (using a static chain). */
550 extern rtx fix_lexical_addr PARAMS ((rtx, tree));
552 /* Return the address of the trampoline for entering nested fn FUNCTION. */
553 extern rtx trampoline_address PARAMS ((tree));
555 /* Return an rtx that refers to the value returned by a function
556 in its original home. This becomes invalid if any more code is emitted. */
557 extern rtx hard_function_value PARAMS ((tree, tree, int));
559 extern rtx prepare_call_address PARAMS ((rtx, tree, rtx *, int, int));
561 extern rtx expand_call PARAMS ((tree, rtx, int));
563 extern rtx expand_shift PARAMS ((enum tree_code, enum machine_mode, rtx, tree,
565 extern rtx expand_divmod PARAMS ((int, enum tree_code, enum machine_mode, rtx,
567 extern void locate_and_pad_parm PARAMS ((enum machine_mode, tree, int, tree,
571 struct args_size *));
572 extern rtx expand_inline_function PARAMS ((tree, tree, rtx, int, tree, rtx));
574 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
575 extern rtx label_rtx PARAMS ((tree));
578 /* Indicate how an input argument register was promoted. */
579 extern rtx promoted_input_arg PARAMS ((unsigned int, enum machine_mode *,
582 /* Return an rtx like arg but sans any constant terms.
583 Returns the original rtx if it has no constant terms.
584 The constant terms are added and stored via a second arg. */
585 extern rtx eliminate_constant_term PARAMS ((rtx, rtx *));
587 /* Convert arg to a valid memory address for specified machine mode,
588 by emitting insns to perform arithmetic if nec. */
589 extern rtx memory_address PARAMS ((enum machine_mode, rtx));
591 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
592 extern rtx memory_address_noforce PARAMS ((enum machine_mode, rtx));
594 /* Set the alias set of MEM to SET. */
595 extern void set_mem_alias_set PARAMS ((rtx, HOST_WIDE_INT));
597 /* Set the alignment of MEM to ALIGN bits. */
598 extern void set_mem_align PARAMS ((rtx, unsigned int));
600 /* Set the expr for MEM to EXPR. */
601 extern void set_mem_expr PARAMS ((rtx, tree));
603 /* Set the offset for MEM to OFFSET. */
604 extern void set_mem_offset PARAMS ((rtx, rtx));
606 /* Return a memory reference like MEMREF, but with its mode changed
607 to MODE and its address changed to ADDR.
608 (VOIDmode means don't change the mode.
609 NULL for ADDR means don't change the address.) */
610 extern rtx change_address PARAMS ((rtx, enum machine_mode, rtx));
612 /* Return a memory reference like MEMREF, but with its mode changed
613 to MODE and its address offset by OFFSET bytes. */
614 #define adjust_address(MEMREF, MODE, OFFSET) \
615 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
617 /* Likewise, but the reference is not required to be valid. */
618 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
619 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
621 /* Return a memory reference like MEMREF, but with its mode changed
622 to MODE and its address changed to ADDR, which is assumed to be
623 increased by OFFSET bytes from MEMREF. */
624 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
625 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
627 /* Likewise, but the reference is not required to be valid. */
628 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
629 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
631 extern rtx adjust_address_1 PARAMS ((rtx, enum machine_mode, HOST_WIDE_INT,
633 extern rtx adjust_automodify_address_1 PARAMS ((rtx, enum machine_mode,
634 rtx, HOST_WIDE_INT, int));
636 /* Return a memory reference like MEMREF, but whose address is changed by
637 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
638 known to be in OFFSET (possibly 1). */
639 extern rtx offset_address PARAMS ((rtx, rtx, HOST_WIDE_INT));
641 /* Return a memory reference like MEMREF, but with its address changed to
642 ADDR. The caller is asserting that the actual piece of memory pointed
643 to is the same, just the form of the address is being changed, such as
644 by putting something into a register. */
645 extern rtx replace_equiv_address PARAMS ((rtx, rtx));
647 /* Likewise, but the reference is not required to be valid. */
648 extern rtx replace_equiv_address_nv PARAMS ((rtx, rtx));
650 /* Return a memory reference like MEMREF, but with its mode widened to
651 MODE and adjusted by OFFSET. */
652 extern rtx widen_memory_access PARAMS ((rtx, enum machine_mode, HOST_WIDE_INT));
654 /* Return a memory reference like MEMREF, but which is known to have a
656 extern rtx validize_mem PARAMS ((rtx));
659 /* Given REF, either a MEM or a REG, and T, either the type of X or
660 the expression corresponding to REF, set RTX_UNCHANGING_P if
662 extern void maybe_set_unchanging PARAMS ((rtx, tree));
664 /* Given REF, a MEM, and T, either the type of X or the expression
665 corresponding to REF, set the memory attributes. OBJECTP is nonzero
666 if we are making a new object of this type. */
667 extern void set_mem_attributes PARAMS ((rtx, tree, int));
670 /* Assemble the static constant template for function entry trampolines. */
671 extern rtx assemble_trampoline_template PARAMS ((void));
673 /* Given rtx, return new rtx whose address won't be affected by
674 any side effects. It has been copied to a new temporary reg. */
675 extern rtx stabilize PARAMS ((rtx));
677 /* Given an rtx, copy all regs it refers to into new temps
678 and return a modified copy that refers to the new temps. */
679 extern rtx copy_all_regs PARAMS ((rtx));
681 /* Copy given rtx to a new temp reg and return that. */
682 extern rtx copy_to_reg PARAMS ((rtx));
684 /* Like copy_to_reg but always make the reg Pmode. */
685 extern rtx copy_addr_to_reg PARAMS ((rtx));
687 /* Like copy_to_reg but always make the reg the specified mode MODE. */
688 extern rtx copy_to_mode_reg PARAMS ((enum machine_mode, rtx));
690 /* Copy given rtx to given temp reg and return that. */
691 extern rtx copy_to_suggested_reg PARAMS ((rtx, rtx, enum machine_mode));
693 /* Copy a value to a register if it isn't already a register.
694 Args are mode (in case value is a constant) and the value. */
695 extern rtx force_reg PARAMS ((enum machine_mode, rtx));
697 /* Return given rtx, copied into a new temp reg if it was in memory. */
698 extern rtx force_not_mem PARAMS ((rtx));
701 /* Return mode and signedness to use when object is promoted. */
702 extern enum machine_mode promote_mode PARAMS ((tree, enum machine_mode,
706 /* Remove some bytes from the stack. An rtx says how many. */
707 extern void adjust_stack PARAMS ((rtx));
709 /* Add some bytes to the stack. An rtx says how many. */
710 extern void anti_adjust_stack PARAMS ((rtx));
712 /* This enum is used for the following two functions. */
713 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
715 /* Save the stack pointer at the specified level. */
716 extern void emit_stack_save PARAMS ((enum save_level, rtx *, rtx));
718 /* Restore the stack pointer from a save area of the specified level. */
719 extern void emit_stack_restore PARAMS ((enum save_level, rtx, rtx));
721 /* Allocate some space on the stack dynamically and return its address. An rtx
722 says how many bytes. */
723 extern rtx allocate_dynamic_stack_space PARAMS ((rtx, rtx, int));
725 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
726 FIRST is a constant and size is a Pmode RTX. These are offsets from the
727 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
728 subtract from the stack. If SIZE is constant, this is done
729 with a fixed number of probes. Otherwise, we must make a loop. */
730 extern void probe_stack_range PARAMS ((HOST_WIDE_INT, rtx));
732 /* Return an rtx that refers to the value returned by a library call
733 in its original home. This becomes invalid if any more code is emitted. */
734 extern rtx hard_libcall_value PARAMS ((enum machine_mode));
736 /* Given an rtx, return an rtx for a value rounded up to a multiple
737 of STACK_BOUNDARY / BITS_PER_UNIT. */
738 extern rtx round_push PARAMS ((rtx));
740 /* Return the mode desired by operand N of a particular bitfield
741 insert/extract insn, or MAX_MACHINE_MODE if no such insn is
744 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
745 extern enum machine_mode
746 mode_for_extraction PARAMS ((enum extraction_pattern, int));
748 extern rtx store_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
749 unsigned HOST_WIDE_INT,
750 enum machine_mode, rtx, HOST_WIDE_INT));
751 extern rtx extract_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
752 unsigned HOST_WIDE_INT, int, rtx,
753 enum machine_mode, enum machine_mode,
755 extern rtx expand_mult PARAMS ((enum machine_mode, rtx, rtx, rtx, int));
756 extern rtx expand_mult_add PARAMS ((rtx, rtx, rtx, rtx,enum machine_mode, int));
757 extern rtx expand_mult_highpart_adjust PARAMS ((enum machine_mode, rtx, rtx, rtx, rtx, int));
759 extern rtx assemble_static_space PARAMS ((int));
761 /* Hook called by expand_expr for language-specific tree codes.
762 It is up to the language front end to install a hook
763 if it has any such codes that expand_expr needs to know about. */
764 extern rtx (*lang_expand_expr) PARAMS ((union tree_node *, rtx,
766 enum expand_modifier modifier));
768 extern int safe_from_p PARAMS ((rtx, tree, int));
770 /* Call this once to initialize the contents of the optabs
771 appropriately for the current target machine. */
772 extern void init_optabs PARAMS ((void));
773 extern void init_all_optabs PARAMS ((void));
775 /* Call this to initialize an optab function entry. */
776 extern rtx init_one_libfunc PARAMS ((const char *));
778 extern void do_jump_by_parts_equality_rtx PARAMS ((rtx, rtx, rtx));
779 extern void do_jump_by_parts_greater_rtx PARAMS ((enum machine_mode,
783 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
784 extern void mark_seen_cases PARAMS ((tree, unsigned char *,
785 HOST_WIDE_INT, int));