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 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_STACK_PARM means we are possibly expanding a call param onto
48 the stack. Choosing a value of 2 isn't special; It just allows
49 some code optimization in store_expr.
50 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
51 EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
52 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
53 is a constant that is not a legitimate address.
54 EXPAND_WRITE means we are only going to write to the resulting rtx. */
55 enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM = 2, EXPAND_SUM,
56 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE};
58 /* Prevent the compiler from deferring stack pops. See
59 inhibit_defer_pop for more information. */
60 #define NO_DEFER_POP (inhibit_defer_pop += 1)
62 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for
64 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
66 enum direction {none, upward, downward};
68 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
69 /* Structure to record the size of a sequence of arguments
70 as the sum of a tree-expression and a constant. This structure is
71 also used to store offsets from the stack, which might be negative,
72 so the variable part must be ssizetype, not sizetype. */
76 HOST_WIDE_INT constant;
80 /* Package up various arg related fields of struct args for
81 locate_and_pad_parm. */
82 struct locate_and_pad_arg_data
84 /* Size of this argument on the stack, rounded up for any padding it
85 gets. If REG_PARM_STACK_SPACE is defined, then register parms are
86 counted here, otherwise they aren't. */
87 struct args_size size;
88 /* Offset of this argument from beginning of stack-args. */
89 struct args_size offset;
90 /* Offset to the start of the stack slot. Different from OFFSET
91 if this arg pads downward. */
92 struct args_size slot_offset;
93 /* The amount that the stack pointer needs to be adjusted to
94 force alignment for the next argument. */
95 struct args_size alignment_pad;
99 /* Add the value of the tree INC to the `struct args_size' TO. */
101 #define ADD_PARM_SIZE(TO, INC) \
104 if (host_integerp (inc, 0)) \
105 (TO).constant += tree_low_cst (inc, 0); \
106 else if ((TO).var == 0) \
107 (TO).var = convert (ssizetype, inc); \
109 (TO).var = size_binop (PLUS_EXPR, (TO).var, \
110 convert (ssizetype, inc)); \
113 #define SUB_PARM_SIZE(TO, DEC) \
116 if (host_integerp (dec, 0)) \
117 (TO).constant -= tree_low_cst (dec, 0); \
118 else if ((TO).var == 0) \
119 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \
120 convert (ssizetype, dec)); \
122 (TO).var = size_binop (MINUS_EXPR, (TO).var, \
123 convert (ssizetype, dec)); \
126 /* Convert the implicit sum in a `struct args_size' into a tree
127 of type ssizetype. */
128 #define ARGS_SIZE_TREE(SIZE) \
129 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \
130 : size_binop (PLUS_EXPR, convert (ssizetype, (SIZE).var), \
131 ssize_int ((SIZE).constant)))
133 /* Convert the implicit sum in a `struct args_size' into an rtx. */
134 #define ARGS_SIZE_RTX(SIZE) \
135 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
136 : expand_expr (ARGS_SIZE_TREE (SIZE), NULL_RTX, VOIDmode, 0))
138 /* Supply a default definition for FUNCTION_ARG_PADDING:
139 usually pad upward, but pad short args downward on
140 big-endian machines. */
142 #ifndef FUNCTION_ARG_PADDING
143 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
144 (! BYTES_BIG_ENDIAN \
146 : (((MODE) == BLKmode \
147 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
148 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
149 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
150 ? downward : upward))
153 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
154 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
157 #ifndef FUNCTION_ARG_BOUNDARY
158 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
161 /* Provide a default value for STRICT_ARGUMENT_NAMING. */
162 #ifndef STRICT_ARGUMENT_NAMING
163 #define STRICT_ARGUMENT_NAMING 0
166 /* Provide a default value for PRETEND_OUTGOING_VARARGS_NAMED. */
167 #ifdef SETUP_INCOMING_VARARGS
168 #ifndef PRETEND_OUTGOING_VARARGS_NAMED
169 #define PRETEND_OUTGOING_VARARGS_NAMED 1
172 /* It is an error to define PRETEND_OUTGOING_VARARGS_NAMED without
173 defining SETUP_INCOMING_VARARGS. */
174 #define PRETEND_OUTGOING_VARARGS_NAMED 0
177 /* Nonzero if we do not know how to pass TYPE solely in registers. */
178 extern bool default_must_pass_in_stack PARAMS((enum machine_mode, tree));
179 #ifndef MUST_PASS_IN_STACK
180 #define MUST_PASS_IN_STACK(MODE,TYPE) default_must_pass_in_stack(MODE, TYPE)
183 /* Nonzero if type TYPE should be returned in memory.
184 Most machines can use the following default definition. */
186 #ifndef RETURN_IN_MEMORY
187 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
190 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
191 Normally move_insn, so Pmode stack pointer. */
193 #ifndef STACK_SAVEAREA_MODE
194 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
197 /* Supply a default definition of STACK_SIZE_MODE for
198 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
200 #ifndef STACK_SIZE_MODE
201 #define STACK_SIZE_MODE word_mode
204 /* Provide default values for the macros controlling stack checking. */
206 #ifndef STACK_CHECK_BUILTIN
207 #define STACK_CHECK_BUILTIN 0
210 /* The default interval is one page. */
211 #ifndef STACK_CHECK_PROBE_INTERVAL
212 #define STACK_CHECK_PROBE_INTERVAL 4096
215 /* The default is to do a store into the stack. */
216 #ifndef STACK_CHECK_PROBE_LOAD
217 #define STACK_CHECK_PROBE_LOAD 0
220 /* This value is arbitrary, but should be sufficient for most machines. */
221 #ifndef STACK_CHECK_PROTECT
222 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
225 /* Make the maximum frame size be the largest we can and still only need
226 one probe per function. */
227 #ifndef STACK_CHECK_MAX_FRAME_SIZE
228 #define STACK_CHECK_MAX_FRAME_SIZE \
229 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
232 /* This is arbitrary, but should be large enough everywhere. */
233 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
234 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
237 /* Provide a reasonable default for the maximum size of an object to
238 allocate in the fixed frame. We may need to be able to make this
239 controllable by the user at some point. */
240 #ifndef STACK_CHECK_MAX_VAR_SIZE
241 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
244 /* Functions from optabs.c, commonly used, and without need for the optabs
247 /* Passed to expand_simple_binop and expand_binop to say which options
248 to try to use if the requested operation can't be open-coded on the
249 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
250 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
251 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
252 try anything else. */
263 /* Generate code for a simple binary or unary operation. "Simple" in
264 this case means "can be unambiguously described by a (mode, code)
265 pair and mapped to a single optab." */
266 extern rtx expand_simple_binop PARAMS ((enum machine_mode, enum rtx_code, rtx,
267 rtx, rtx, int, enum optab_methods));
268 extern rtx expand_simple_unop PARAMS ((enum machine_mode, enum rtx_code,
271 /* Report whether the machine description contains an insn which can
272 perform the operation described by CODE and MODE. */
273 extern int have_insn_for PARAMS ((enum rtx_code, enum machine_mode));
275 /* Emit code to make a call to a constant function or a library call. */
276 extern void emit_libcall_block PARAMS ((rtx, rtx, rtx, rtx));
278 /* Create but don't emit one rtl instruction to perform certain operations.
279 Modes must match; operands must meet the operation's predicates.
280 Likewise for subtraction and for just copying.
281 These do not call protect_from_queue; caller must do so. */
282 extern rtx gen_add2_insn PARAMS ((rtx, rtx));
283 extern rtx gen_add3_insn PARAMS ((rtx, rtx, rtx));
284 extern rtx gen_sub2_insn PARAMS ((rtx, rtx));
285 extern rtx gen_sub3_insn PARAMS ((rtx, rtx, rtx));
286 extern rtx gen_move_insn PARAMS ((rtx, rtx));
287 extern int have_add2_insn PARAMS ((rtx, rtx));
288 extern int have_sub2_insn PARAMS ((rtx, rtx));
290 /* Emit a pair of rtl insns to compare two rtx's and to jump
291 to a label if the comparison is true. */
292 extern void emit_cmp_and_jump_insns PARAMS ((rtx, rtx, enum rtx_code, rtx,
293 enum machine_mode, int, rtx));
295 /* Generate code to indirectly jump to a location given in the rtx LOC. */
296 extern void emit_indirect_jump PARAMS ((rtx));
298 #ifdef HAVE_conditional_move
299 /* Emit a conditional move operation. */
300 rtx emit_conditional_move PARAMS ((rtx, enum rtx_code, rtx, rtx,
301 enum machine_mode, rtx, rtx,
302 enum machine_mode, int));
304 /* Return nonzero if the conditional move is supported. */
305 int can_conditionally_move_p PARAMS ((enum machine_mode mode));
308 rtx emit_conditional_add PARAMS ((rtx, enum rtx_code, rtx, rtx,
309 enum machine_mode, rtx, rtx,
310 enum machine_mode, int));
313 /* Functions from expmed.c: */
315 /* Arguments MODE, RTX: return an rtx for the negation of that value.
317 extern rtx negate_rtx PARAMS ((enum machine_mode, rtx));
319 /* Expand a logical AND operation. */
320 extern rtx expand_and PARAMS ((enum machine_mode, rtx, rtx, rtx));
322 /* Emit a store-flag operation. */
323 extern rtx emit_store_flag PARAMS ((rtx, enum rtx_code, rtx, rtx,
324 enum machine_mode, int, int));
326 /* Like emit_store_flag, but always succeeds. */
327 extern rtx emit_store_flag_force PARAMS ((rtx, enum rtx_code, rtx, rtx,
328 enum machine_mode, int, int));
330 /* Functions from loop.c: */
332 /* Given an insn and condition, return a canonical description of
333 the test being made. */
334 extern rtx canonicalize_condition PARAMS ((rtx, rtx, int, rtx *, rtx));
336 /* Given a JUMP_INSN, return a canonical description of the test
338 extern rtx get_condition PARAMS ((rtx, rtx *));
340 /* Generate a conditional trap instruction. */
341 extern rtx gen_cond_trap PARAMS ((enum rtx_code, rtx, rtx, rtx));
343 /* Functions from builtins.c: */
344 extern rtx expand_builtin PARAMS ((tree, rtx, rtx, enum machine_mode, int));
345 extern void std_expand_builtin_va_start PARAMS ((tree, rtx));
346 extern rtx std_expand_builtin_va_arg PARAMS ((tree, tree));
347 extern rtx expand_builtin_va_arg PARAMS ((tree, tree));
348 extern void default_init_builtins PARAMS ((void));
349 extern rtx default_expand_builtin PARAMS ((tree, rtx, rtx,
350 enum machine_mode, int));
351 extern void expand_builtin_setjmp_setup PARAMS ((rtx, rtx));
352 extern void expand_builtin_setjmp_receiver PARAMS ((rtx));
353 extern void expand_builtin_longjmp PARAMS ((rtx, rtx));
354 extern rtx expand_builtin_saveregs PARAMS ((void));
355 extern void expand_builtin_trap PARAMS ((void));
356 extern HOST_WIDE_INT get_varargs_alias_set PARAMS ((void));
357 extern HOST_WIDE_INT get_frame_alias_set PARAMS ((void));
358 extern void record_base_value PARAMS ((unsigned int, rtx, int));
359 extern void record_alias_subset PARAMS ((HOST_WIDE_INT,
361 extern HOST_WIDE_INT new_alias_set PARAMS ((void));
362 extern int can_address_p PARAMS ((tree));
364 /* Functions from expr.c: */
366 /* This is run once per compilation to set up which modes can be used
367 directly in memory and to initialize the block move optab. */
368 extern void init_expr_once PARAMS ((void));
370 /* This is run at the start of compiling a function. */
371 extern void init_expr PARAMS ((void));
373 /* This is run at the end of compiling a function. */
374 extern void finish_expr_for_function PARAMS ((void));
376 /* Use protect_from_queue to convert a QUEUED expression
377 into something that you can put immediately into an instruction. */
378 extern rtx protect_from_queue PARAMS ((rtx, int));
380 /* Perform all the pending incrementations. */
381 extern void emit_queue PARAMS ((void));
383 /* Tell if something has a queued subexpression. */
384 extern int queued_subexp_p PARAMS ((rtx));
386 /* Emit some rtl insns to move data between rtx's, converting machine modes.
387 Both modes must be floating or both fixed. */
388 extern void convert_move PARAMS ((rtx, rtx, int));
390 /* Convert an rtx to specified machine mode and return the result. */
391 extern rtx convert_to_mode PARAMS ((enum machine_mode, rtx, int));
393 /* Convert an rtx to MODE from OLDMODE and return the result. */
394 extern rtx convert_modes PARAMS ((enum machine_mode, enum machine_mode,
397 /* Emit code to move a block Y to a block X. */
399 enum block_op_methods
406 extern void init_block_move_fn PARAMS ((const char *));
407 extern void init_block_clear_fn PARAMS ((const char *));
409 extern rtx emit_block_move PARAMS ((rtx, rtx, rtx, enum block_op_methods));
411 /* Copy all or part of a value X into registers starting at REGNO.
412 The number of registers to be filled is NREGS. */
413 extern void move_block_to_reg PARAMS ((int, rtx, int, enum machine_mode));
415 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
416 The number of registers to be filled is NREGS. */
417 extern void move_block_from_reg PARAMS ((int, rtx, int));
419 /* Generate a non-consecutive group of registers represented by a PARALLEL. */
420 extern rtx gen_group_rtx PARAMS ((rtx));
422 /* Load a BLKmode value into non-consecutive registers represented by a
424 extern void emit_group_load PARAMS ((rtx, rtx, int));
426 /* Move a non-consecutive group of registers represented by a PARALLEL into
427 a non-consecutive group of registers represented by a PARALLEL. */
428 extern void emit_group_move PARAMS ((rtx, rtx));
430 /* Store a BLKmode value from non-consecutive registers represented by a
432 extern void emit_group_store PARAMS ((rtx, rtx, int));
435 /* Copy BLKmode object from a set of registers. */
436 extern rtx copy_blkmode_from_reg PARAMS ((rtx, rtx, tree));
439 /* Mark REG as holding a parameter for the next CALL_INSN. */
440 extern void use_reg PARAMS ((rtx *, rtx));
442 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
443 for the next CALL_INSN. */
444 extern void use_regs PARAMS ((rtx *, int, int));
446 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
447 extern void use_group_regs PARAMS ((rtx *, rtx));
449 /* Write zeros through the storage of OBJECT.
450 If OBJECT has BLKmode, SIZE is its length in bytes. */
451 extern rtx clear_storage PARAMS ((rtx, rtx));
453 /* Determine whether the LEN bytes can be moved by using several move
454 instructions. Return nonzero if a call to move_by_pieces should
456 extern int can_move_by_pieces PARAMS ((unsigned HOST_WIDE_INT, unsigned int));
458 /* Return nonzero if it is desirable to store LEN bytes generated by
459 CONSTFUN with several move instructions by store_by_pieces
460 function. CONSTFUNDATA is a pointer which will be passed as argument
461 in every CONSTFUN call.
462 ALIGN is maximum alignment we can assume. */
463 extern int can_store_by_pieces PARAMS ((unsigned HOST_WIDE_INT,
464 rtx (*) (PTR, HOST_WIDE_INT,
468 /* Generate several move instructions to store LEN bytes generated by
469 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
470 pointer which will be passed as argument in every CONSTFUN call.
471 ALIGN is maximum alignment we can assume.
473 extern rtx store_by_pieces PARAMS ((rtx, unsigned HOST_WIDE_INT,
474 rtx (*) (PTR, HOST_WIDE_INT,
476 PTR, unsigned int, int));
478 /* Emit insns to set X from Y. */
479 extern rtx emit_move_insn PARAMS ((rtx, rtx));
481 /* Emit insns to set X from Y, with no frills. */
482 extern rtx emit_move_insn_1 PARAMS ((rtx, rtx));
484 /* Push a block of length SIZE (perhaps variable)
485 and return an rtx to address the beginning of the block. */
486 extern rtx push_block PARAMS ((rtx, int, int));
489 /* Generate code to push something onto the stack, given its mode and type. */
490 extern void emit_push_insn PARAMS ((rtx, enum machine_mode, tree, rtx,
491 unsigned int, int, rtx, int, rtx, rtx,
494 /* Expand an assignment that stores the value of FROM into TO. */
495 extern rtx expand_assignment PARAMS ((tree, tree, int, int));
497 /* Generate code for computing expression EXP,
498 and storing the value into TARGET.
499 If SUGGEST_REG is nonzero, copy the value through a register
500 and return that register, if that is possible. */
501 extern rtx store_expr PARAMS ((tree, rtx, int));
504 /* Given an rtx that may include add and multiply operations,
505 generate them as insns and return a pseudo-reg containing the value.
506 Useful after calling expand_expr with 1 as sum_ok. */
507 extern rtx force_operand PARAMS ((rtx, rtx));
509 /* Return an object on the placeholder list that matches EXP, a
510 PLACEHOLDER_EXPR. An object "matches" if it is of the type of the
511 PLACEHOLDER_EXPR or a pointer type to it. For further information, see
512 tree.def. If no such object is found, abort. If PLIST is nonzero, it is
513 a location which initially points to a starting location in the
514 placeholder list (zero means start of the list) and where a pointer into
515 the placeholder list at which the object is found is placed. */
516 extern tree find_placeholder PARAMS ((tree, tree *));
518 /* Generate code for computing expression EXP.
519 An rtx for the computed value is returned. The value is never null.
520 In the case of a void EXP, const0_rtx is returned. */
521 extern rtx expand_expr PARAMS ((tree, rtx, enum machine_mode,
522 enum expand_modifier));
524 /* At the start of a function, record that we have no previously-pushed
525 arguments waiting to be popped. */
526 extern void init_pending_stack_adjust PARAMS ((void));
528 /* When exiting from function, if safe, clear out any pending stack adjust
529 so the adjustment won't get done. */
530 extern void clear_pending_stack_adjust PARAMS ((void));
532 /* Pop any previously-pushed arguments that have not been popped yet. */
533 extern void do_pending_stack_adjust PARAMS ((void));
536 /* Return the tree node and offset if a given argument corresponds to
537 a string constant. */
538 extern tree string_constant PARAMS ((tree, tree *));
540 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
541 extern void jumpifnot PARAMS ((tree, rtx));
543 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
544 extern void jumpif PARAMS ((tree, rtx));
546 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
547 the result is zero, or IF_TRUE_LABEL if the result is one. */
548 extern void do_jump PARAMS ((tree, rtx, rtx));
551 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
552 extern rtx compare_from_rtx PARAMS ((rtx, rtx, enum rtx_code, int,
553 enum machine_mode, rtx));
554 extern void do_compare_rtx_and_jump PARAMS ((rtx, rtx, enum rtx_code, int,
555 enum machine_mode, rtx,
558 /* Two different ways of generating switch statements. */
559 extern int try_casesi PARAMS ((tree, tree, tree, tree, rtx, rtx));
560 extern int try_tablejump PARAMS ((tree, tree, tree, tree, rtx, rtx));
562 /* Smallest number of adjacent cases before we use a jump table.
563 XXX Should be a target hook. */
564 extern unsigned int case_values_threshold PARAMS ((void));
568 /* rtl.h and tree.h were included. */
569 /* Return an rtx for the size in bytes of the value of an expr. */
570 extern rtx expr_size PARAMS ((tree));
572 /* Return a wide integer for the size in bytes of the value of EXP, or -1
573 if the size can vary or is larger than an integer. */
574 extern HOST_WIDE_INT int_expr_size PARAMS ((tree));
576 extern rtx lookup_static_chain PARAMS ((tree));
578 /* Convert a stack slot address ADDR valid in function FNDECL
579 into an address valid in this function (using a static chain). */
580 extern rtx fix_lexical_addr PARAMS ((rtx, tree));
582 /* Return the address of the trampoline for entering nested fn FUNCTION. */
583 extern rtx trampoline_address PARAMS ((tree));
585 /* Return an rtx that refers to the value returned by a function
586 in its original home. This becomes invalid if any more code is emitted. */
587 extern rtx hard_function_value PARAMS ((tree, tree, int));
589 extern rtx prepare_call_address PARAMS ((rtx, tree, rtx *, int, int));
591 extern rtx expand_call PARAMS ((tree, rtx, int));
593 extern rtx expand_shift PARAMS ((enum tree_code, enum machine_mode, rtx, tree,
595 extern rtx expand_divmod PARAMS ((int, enum tree_code, enum machine_mode, rtx,
597 extern void locate_and_pad_parm PARAMS ((enum machine_mode, tree, int, int,
598 tree, struct args_size *,
599 struct locate_and_pad_arg_data *));
600 extern rtx expand_inline_function PARAMS ((tree, tree, rtx, int, tree, rtx));
602 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
603 extern rtx label_rtx PARAMS ((tree));
605 /* As label_rtx, but additionally the label is placed on the forced label
606 list of its containing function (i.e. it is treated as reachable even
607 if how is not obvious). */
608 extern rtx force_label_rtx PARAMS ((tree));
611 /* Indicate how an input argument register was promoted. */
612 extern rtx promoted_input_arg PARAMS ((unsigned int, enum machine_mode *,
615 /* Return an rtx like arg but sans any constant terms.
616 Returns the original rtx if it has no constant terms.
617 The constant terms are added and stored via a second arg. */
618 extern rtx eliminate_constant_term PARAMS ((rtx, rtx *));
620 /* Convert arg to a valid memory address for specified machine mode,
621 by emitting insns to perform arithmetic if nec. */
622 extern rtx memory_address PARAMS ((enum machine_mode, rtx));
624 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
625 extern rtx memory_address_noforce PARAMS ((enum machine_mode, rtx));
627 /* Set the alias set of MEM to SET. */
628 extern void set_mem_alias_set PARAMS ((rtx, HOST_WIDE_INT));
630 /* Set the alignment of MEM to ALIGN bits. */
631 extern void set_mem_align PARAMS ((rtx, unsigned int));
633 /* Set the expr for MEM to EXPR. */
634 extern void set_mem_expr PARAMS ((rtx, tree));
636 /* Set the offset for MEM to OFFSET. */
637 extern void set_mem_offset PARAMS ((rtx, rtx));
639 /* Set the size for MEM to SIZE. */
640 extern void set_mem_size PARAMS ((rtx, rtx));
642 /* Return a memory reference like MEMREF, but with its mode changed
643 to MODE and its address changed to ADDR.
644 (VOIDmode means don't change the mode.
645 NULL for ADDR means don't change the address.) */
646 extern rtx change_address PARAMS ((rtx, enum machine_mode, rtx));
648 /* Return a memory reference like MEMREF, but with its mode changed
649 to MODE and its address offset by OFFSET bytes. */
650 #define adjust_address(MEMREF, MODE, OFFSET) \
651 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
653 /* Likewise, but the reference is not required to be valid. */
654 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
655 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
657 /* Return a memory reference like MEMREF, but with its mode changed
658 to MODE and its address changed to ADDR, which is assumed to be
659 increased by OFFSET bytes from MEMREF. */
660 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
661 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
663 /* Likewise, but the reference is not required to be valid. */
664 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
665 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
667 extern rtx adjust_address_1 PARAMS ((rtx, enum machine_mode, HOST_WIDE_INT,
669 extern rtx adjust_automodify_address_1 PARAMS ((rtx, enum machine_mode,
670 rtx, HOST_WIDE_INT, int));
672 /* Return a memory reference like MEMREF, but whose address is changed by
673 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
674 known to be in OFFSET (possibly 1). */
675 extern rtx offset_address PARAMS ((rtx, rtx, unsigned HOST_WIDE_INT));
677 /* Return a memory reference like MEMREF, but with its address changed to
678 ADDR. The caller is asserting that the actual piece of memory pointed
679 to is the same, just the form of the address is being changed, such as
680 by putting something into a register. */
681 extern rtx replace_equiv_address PARAMS ((rtx, rtx));
683 /* Likewise, but the reference is not required to be valid. */
684 extern rtx replace_equiv_address_nv PARAMS ((rtx, rtx));
686 /* Return a memory reference like MEMREF, but with its mode widened to
687 MODE and adjusted by OFFSET. */
688 extern rtx widen_memory_access PARAMS ((rtx, enum machine_mode, HOST_WIDE_INT));
690 /* Return a memory reference like MEMREF, but which is known to have a
692 extern rtx validize_mem PARAMS ((rtx));
695 /* Given REF, either a MEM or a REG, and T, either the type of X or
696 the expression corresponding to REF, set RTX_UNCHANGING_P if
698 extern void maybe_set_unchanging PARAMS ((rtx, tree));
700 /* Given REF, a MEM, and T, either the type of X or the expression
701 corresponding to REF, set the memory attributes. OBJECTP is nonzero
702 if we are making a new object of this type. */
703 extern void set_mem_attributes PARAMS ((rtx, tree, int));
705 /* Similar, except that BITPOS has not yet been applied to REF, so if
706 we alter MEM_OFFSET according to T then we should subtract BITPOS
707 expecting that it'll be added back in later. */
708 extern void set_mem_attributes_minus_bitpos PARAMS ((rtx, tree, int,
712 /* Assemble the static constant template for function entry trampolines. */
713 extern rtx assemble_trampoline_template PARAMS ((void));
715 /* Given rtx, return new rtx whose address won't be affected by
716 any side effects. It has been copied to a new temporary reg. */
717 extern rtx stabilize PARAMS ((rtx));
719 /* Given an rtx, copy all regs it refers to into new temps
720 and return a modified copy that refers to the new temps. */
721 extern rtx copy_all_regs PARAMS ((rtx));
723 /* Copy given rtx to a new temp reg and return that. */
724 extern rtx copy_to_reg PARAMS ((rtx));
726 /* Like copy_to_reg but always make the reg Pmode. */
727 extern rtx copy_addr_to_reg PARAMS ((rtx));
729 /* Like copy_to_reg but always make the reg the specified mode MODE. */
730 extern rtx copy_to_mode_reg PARAMS ((enum machine_mode, rtx));
732 /* Copy given rtx to given temp reg and return that. */
733 extern rtx copy_to_suggested_reg PARAMS ((rtx, rtx, enum machine_mode));
735 /* Copy a value to a register if it isn't already a register.
736 Args are mode (in case value is a constant) and the value. */
737 extern rtx force_reg PARAMS ((enum machine_mode, rtx));
739 /* Return given rtx, copied into a new temp reg if it was in memory. */
740 extern rtx force_not_mem PARAMS ((rtx));
743 /* Return mode and signedness to use when object is promoted. */
744 extern enum machine_mode promote_mode PARAMS ((tree, enum machine_mode,
748 /* Remove some bytes from the stack. An rtx says how many. */
749 extern void adjust_stack PARAMS ((rtx));
751 /* Add some bytes to the stack. An rtx says how many. */
752 extern void anti_adjust_stack PARAMS ((rtx));
754 /* This enum is used for the following two functions. */
755 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
757 /* Save the stack pointer at the specified level. */
758 extern void emit_stack_save PARAMS ((enum save_level, rtx *, rtx));
760 /* Restore the stack pointer from a save area of the specified level. */
761 extern void emit_stack_restore PARAMS ((enum save_level, rtx, rtx));
763 /* Allocate some space on the stack dynamically and return its address. An rtx
764 says how many bytes. */
765 extern rtx allocate_dynamic_stack_space PARAMS ((rtx, rtx, int));
767 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
768 FIRST is a constant and size is a Pmode RTX. These are offsets from the
769 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
770 subtract from the stack. If SIZE is constant, this is done
771 with a fixed number of probes. Otherwise, we must make a loop. */
772 extern void probe_stack_range PARAMS ((HOST_WIDE_INT, rtx));
774 /* Return an rtx that refers to the value returned by a library call
775 in its original home. This becomes invalid if any more code is emitted. */
776 extern rtx hard_libcall_value PARAMS ((enum machine_mode));
778 /* Given an rtx, return an rtx for a value rounded up to a multiple
779 of STACK_BOUNDARY / BITS_PER_UNIT. */
780 extern rtx round_push PARAMS ((rtx));
782 /* Return the mode desired by operand N of a particular bitfield
783 insert/extract insn, or MAX_MACHINE_MODE if no such insn is
786 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
787 extern enum machine_mode
788 mode_for_extraction PARAMS ((enum extraction_pattern, int));
790 extern rtx store_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
791 unsigned HOST_WIDE_INT,
792 enum machine_mode, rtx, HOST_WIDE_INT));
793 extern rtx extract_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
794 unsigned HOST_WIDE_INT, int, rtx,
795 enum machine_mode, enum machine_mode,
797 extern rtx expand_mult PARAMS ((enum machine_mode, rtx, rtx, rtx, int));
798 extern bool const_mult_add_overflow_p PARAMS ((rtx, rtx, rtx, enum machine_mode, int));
799 extern rtx expand_mult_add PARAMS ((rtx, rtx, rtx, rtx,enum machine_mode, int));
800 extern rtx expand_mult_highpart_adjust PARAMS ((enum machine_mode, rtx, rtx, rtx, rtx, int));
802 extern rtx assemble_static_space PARAMS ((unsigned HOST_WIDE_INT));
803 extern int safe_from_p PARAMS ((rtx, tree, int));
805 /* Call this once to initialize the contents of the optabs
806 appropriately for the current target machine. */
807 extern void init_optabs PARAMS ((void));
808 extern void init_all_optabs PARAMS ((void));
810 /* Call this to initialize an optab function entry. */
811 extern rtx init_one_libfunc PARAMS ((const char *));
813 extern void do_jump_by_parts_equality_rtx PARAMS ((rtx, rtx, rtx));
814 extern void do_jump_by_parts_greater_rtx PARAMS ((enum machine_mode,
818 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
819 extern void mark_seen_cases PARAMS ((tree, unsigned char *,
820 HOST_WIDE_INT, int));
823 extern int vector_mode_valid_p PARAMS ((enum machine_mode));
825 extern tree placeholder_list;