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) \
81 if (host_integerp (inc, 0)) \
82 (TO).constant += tree_low_cst (inc, 0); \
83 else if ((TO).var == 0) \
84 (TO).var = convert (ssizetype, inc); \
86 (TO).var = size_binop (PLUS_EXPR, (TO).var, \
87 convert (ssizetype, inc)); \
90 #define SUB_PARM_SIZE(TO, DEC) \
93 if (host_integerp (dec, 0)) \
94 (TO).constant -= tree_low_cst (dec, 0); \
95 else if ((TO).var == 0) \
96 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \
97 convert (ssizetype, dec)); \
99 (TO).var = size_binop (MINUS_EXPR, (TO).var, \
100 convert (ssizetype, dec)); \
103 /* Convert the implicit sum in a `struct args_size' into a tree
104 of type ssizetype. */
105 #define ARGS_SIZE_TREE(SIZE) \
106 ((SIZE).var == 0 ? ssize_int ((SIZE).constant) \
107 : size_binop (PLUS_EXPR, convert (ssizetype, (SIZE).var), \
108 ssize_int ((SIZE).constant)))
110 /* Convert the implicit sum in a `struct args_size' into an rtx. */
111 #define ARGS_SIZE_RTX(SIZE) \
112 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
113 : expand_expr (ARGS_SIZE_TREE (SIZE), NULL_RTX, VOIDmode, 0))
115 /* Supply a default definition for FUNCTION_ARG_PADDING:
116 usually pad upward, but pad short args downward on
117 big-endian machines. */
119 enum direction
{none
, upward
, downward
}; /* Value has this type. */
121 #ifndef FUNCTION_ARG_PADDING
122 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
123 (! BYTES_BIG_ENDIAN \
125 : (((MODE) == BLKmode \
126 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
127 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
128 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
129 ? downward : upward))
132 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
133 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
136 #ifndef FUNCTION_ARG_BOUNDARY
137 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
140 /* Provide a default value for STRICT_ARGUMENT_NAMING. */
141 #ifndef STRICT_ARGUMENT_NAMING
142 #define STRICT_ARGUMENT_NAMING 0
145 /* Provide a default value for PRETEND_OUTGOING_VARARGS_NAMED. */
146 #ifdef SETUP_INCOMING_VARARGS
147 #ifndef PRETEND_OUTGOING_VARARGS_NAMED
148 #define PRETEND_OUTGOING_VARARGS_NAMED 1
151 /* It is an error to define PRETEND_OUTGOING_VARARGS_NAMED without
152 defining SETUP_INCOMING_VARARGS. */
153 #define PRETEND_OUTGOING_VARARGS_NAMED 0
156 /* Nonzero if we do not know how to pass TYPE solely in registers.
157 We cannot do so in the following cases:
159 - if the type has variable size
160 - if the type is marked as addressable (it is required to be constructed
162 - if the padding and mode of the type is such that a copy into a register
163 would put it into the wrong part of the register.
165 Which padding can't be supported depends on the byte endianness.
167 A value in a register is implicitly padded at the most significant end.
168 On a big-endian machine, that is the lower end in memory.
169 So a value padded in memory at the upper end can't go in a register.
170 For a little-endian machine, the reverse is true. */
172 #ifndef MUST_PASS_IN_STACK
173 #define MUST_PASS_IN_STACK(MODE,TYPE) \
175 && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
176 || TREE_ADDRESSABLE (TYPE) \
177 || ((MODE) == BLKmode \
178 && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
179 && 0 == (int_size_in_bytes (TYPE) \
180 % (PARM_BOUNDARY / BITS_PER_UNIT))) \
181 && (FUNCTION_ARG_PADDING (MODE, TYPE) \
182 == (BYTES_BIG_ENDIAN ? upward : downward)))))
185 /* Nonzero if type TYPE should be returned in memory.
186 Most machines can use the following default definition. */
188 #ifndef RETURN_IN_MEMORY
189 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
192 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
193 Normally move_insn, so Pmode stack pointer. */
195 #ifndef STACK_SAVEAREA_MODE
196 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
199 /* Supply a default definition of STACK_SIZE_MODE for
200 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
202 #ifndef STACK_SIZE_MODE
203 #define STACK_SIZE_MODE word_mode
206 /* Provide default values for the macros controlling stack checking. */
208 #ifndef STACK_CHECK_BUILTIN
209 #define STACK_CHECK_BUILTIN 0
212 /* The default interval is one page. */
213 #ifndef STACK_CHECK_PROBE_INTERVAL
214 #define STACK_CHECK_PROBE_INTERVAL 4096
217 /* The default is to do a store into the stack. */
218 #ifndef STACK_CHECK_PROBE_LOAD
219 #define STACK_CHECK_PROBE_LOAD 0
222 /* This value is arbitrary, but should be sufficient for most machines. */
223 #ifndef STACK_CHECK_PROTECT
224 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
227 /* Make the maximum frame size be the largest we can and still only need
228 one probe per function. */
229 #ifndef STACK_CHECK_MAX_FRAME_SIZE
230 #define STACK_CHECK_MAX_FRAME_SIZE \
231 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
234 /* This is arbitrary, but should be large enough everywhere. */
235 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
236 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
239 /* Provide a reasonable default for the maximum size of an object to
240 allocate in the fixed frame. We may need to be able to make this
241 controllable by the user at some point. */
242 #ifndef STACK_CHECK_MAX_VAR_SIZE
243 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
246 /* Functions from optabs.c, commonly used, and without need for the optabs
249 /* Passed to expand_simple_binop and expand_binop to say which options
250 to try to use if the requested operation can't be open-coded on the
251 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
252 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
253 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't
254 try anything else. */
265 /* Generate code for a simple binary or unary operation. "Simple" in
266 this case means "can be unambiguously described by a (mode, code)
267 pair and mapped to a single optab." */
268 extern rtx expand_simple_binop
PARAMS ((enum machine_mode
, enum rtx_code
, rtx
,
269 rtx
, rtx
, int, enum optab_methods
));
270 extern rtx expand_simple_unop
PARAMS ((enum machine_mode
, enum rtx_code
,
273 /* Report whether the machine description contains an insn which can
274 perform the operation described by CODE and MODE. */
275 extern int have_insn_for
PARAMS ((enum rtx_code
, enum machine_mode
));
277 /* Emit code to make a call to a constant function or a library call. */
278 extern void emit_libcall_block
PARAMS ((rtx
, rtx
, rtx
, rtx
));
280 /* Create but don't emit one rtl instruction to perform certain operations.
281 Modes must match; operands must meet the operation's predicates.
282 Likewise for subtraction and for just copying.
283 These do not call protect_from_queue; caller must do so. */
284 extern rtx gen_add2_insn
PARAMS ((rtx
, rtx
));
285 extern rtx gen_add3_insn
PARAMS ((rtx
, rtx
, rtx
));
286 extern rtx gen_sub2_insn
PARAMS ((rtx
, rtx
));
287 extern rtx gen_sub3_insn
PARAMS ((rtx
, rtx
, rtx
));
288 extern rtx gen_move_insn
PARAMS ((rtx
, rtx
));
289 extern int have_add2_insn
PARAMS ((rtx
, rtx
));
290 extern int have_sub2_insn
PARAMS ((rtx
, rtx
));
292 /* Emit a pair of rtl insns to compare two rtx's and to jump
293 to a label if the comparison is true. */
294 extern void emit_cmp_and_jump_insns
PARAMS ((rtx
, rtx
, enum rtx_code
, rtx
,
295 enum machine_mode
, int, rtx
));
297 /* Generate code to indirectly jump to a location given in the rtx LOC. */
298 extern void emit_indirect_jump
PARAMS ((rtx
));
300 #ifdef HAVE_conditional_move
301 /* Emit a conditional move operation. */
302 rtx emit_conditional_move
PARAMS ((rtx
, enum rtx_code
, rtx
, rtx
,
303 enum machine_mode
, rtx
, rtx
,
304 enum machine_mode
, int));
306 /* Return nonzero if the conditional move is supported. */
307 int can_conditionally_move_p
PARAMS ((enum machine_mode mode
));
312 /* Functions from expmed.c: */
314 /* Arguments MODE, RTX: return an rtx for the negation of that value.
316 extern rtx negate_rtx
PARAMS ((enum machine_mode
, rtx
));
318 /* Expand a logical AND operation. */
319 extern rtx expand_and
PARAMS ((enum machine_mode
, rtx
, rtx
, rtx
));
321 /* Emit a store-flag operation. */
322 extern rtx emit_store_flag
PARAMS ((rtx
, enum rtx_code
, rtx
, rtx
,
323 enum machine_mode
, int, int));
325 /* Like emit_store_flag, but always succeeds. */
326 extern rtx emit_store_flag_force
PARAMS ((rtx
, enum rtx_code
, rtx
, rtx
,
327 enum machine_mode
, int, int));
329 /* Functions from loop.c: */
331 /* Given an insn and condition, return a canonical description of
332 the test being made. */
333 extern rtx canonicalize_condition
PARAMS ((rtx
, rtx
, int, rtx
*, rtx
));
335 /* Given a JUMP_INSN, return a canonical description of the test
337 extern rtx get_condition
PARAMS ((rtx
, rtx
*));
339 /* Generate a conditional trap instruction. */
340 extern rtx gen_cond_trap
PARAMS ((enum rtx_code
, rtx
, rtx
, rtx
));
342 /* Functions from builtins.c: */
343 extern rtx expand_builtin
PARAMS ((tree
, rtx
, rtx
, enum machine_mode
, int));
344 extern void std_expand_builtin_va_start
PARAMS ((tree
, rtx
));
345 extern rtx std_expand_builtin_va_arg
PARAMS ((tree
, tree
));
346 extern rtx expand_builtin_va_arg
PARAMS ((tree
, tree
));
347 extern void default_init_builtins
PARAMS ((void));
348 extern rtx default_expand_builtin
PARAMS ((tree
, rtx
, rtx
,
349 enum machine_mode
, int));
350 extern void expand_builtin_setjmp_setup
PARAMS ((rtx
, rtx
));
351 extern void expand_builtin_setjmp_receiver
PARAMS ((rtx
));
352 extern void expand_builtin_longjmp
PARAMS ((rtx
, rtx
));
353 extern rtx expand_builtin_saveregs
PARAMS ((void));
354 extern void expand_builtin_trap
PARAMS ((void));
355 extern HOST_WIDE_INT get_varargs_alias_set
PARAMS ((void));
356 extern HOST_WIDE_INT get_frame_alias_set
PARAMS ((void));
357 extern void record_base_value
PARAMS ((unsigned int, rtx
, int));
358 extern void record_alias_subset
PARAMS ((HOST_WIDE_INT
,
360 extern HOST_WIDE_INT new_alias_set
PARAMS ((void));
361 extern int can_address_p
PARAMS ((tree
));
363 /* Functions from expr.c: */
365 /* This is run once per compilation to set up which modes can be used
366 directly in memory and to initialize the block move optab. */
367 extern void init_expr_once
PARAMS ((void));
369 /* This is run at the start of compiling a function. */
370 extern void init_expr
PARAMS ((void));
372 /* This is run at the end of compiling a function. */
373 extern void finish_expr_for_function
PARAMS ((void));
375 /* Use protect_from_queue to convert a QUEUED expression
376 into something that you can put immediately into an instruction. */
377 extern rtx protect_from_queue
PARAMS ((rtx
, int));
379 /* Perform all the pending incrementations. */
380 extern void emit_queue
PARAMS ((void));
382 /* Tell if something has a queued subexpression. */
383 extern int queued_subexp_p
PARAMS ((rtx
));
385 /* Emit some rtl insns to move data between rtx's, converting machine modes.
386 Both modes must be floating or both fixed. */
387 extern void convert_move
PARAMS ((rtx
, rtx
, int));
389 /* Convert an rtx to specified machine mode and return the result. */
390 extern rtx convert_to_mode
PARAMS ((enum machine_mode
, rtx
, int));
392 /* Convert an rtx to MODE from OLDMODE and return the result. */
393 extern rtx convert_modes
PARAMS ((enum machine_mode
, enum machine_mode
,
396 /* Emit code to move a block Y to a block X. */
398 enum block_op_methods
405 extern rtx emit_block_move
PARAMS ((rtx
, rtx
, rtx
, enum block_op_methods
));
407 /* Copy all or part of a value X into registers starting at REGNO.
408 The number of registers to be filled is NREGS. */
409 extern void move_block_to_reg
PARAMS ((int, rtx
, int, enum machine_mode
));
411 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
412 The number of registers to be filled is NREGS. */
413 extern void move_block_from_reg
PARAMS ((int, rtx
, int, int));
415 /* Load a BLKmode value into non-consecutive registers represented by a
417 extern void emit_group_load
PARAMS ((rtx
, rtx
, int));
419 /* Store a BLKmode value from non-consecutive registers represented by a
421 extern void emit_group_store
PARAMS ((rtx
, rtx
, int));
424 /* Copy BLKmode object from a set of registers. */
425 extern rtx copy_blkmode_from_reg
PARAMS ((rtx
,rtx
,tree
));
428 /* Mark REG as holding a parameter for the next CALL_INSN. */
429 extern void use_reg
PARAMS ((rtx
*, rtx
));
431 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
432 for the next CALL_INSN. */
433 extern void use_regs
PARAMS ((rtx
*, int, int));
435 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
436 extern void use_group_regs
PARAMS ((rtx
*, rtx
));
438 /* Write zeros through the storage of OBJECT.
439 If OBJECT has BLKmode, SIZE is its length in bytes. */
440 extern rtx clear_storage
PARAMS ((rtx
, rtx
));
442 /* Return nonzero if it is desirable to store LEN bytes generated by
443 CONSTFUN with several move instructions by store_by_pieces
444 function. CONSTFUNDATA is a pointer which will be passed as argument
445 in every CONSTFUN call.
446 ALIGN is maximum alignment we can assume. */
447 extern int can_store_by_pieces
PARAMS ((unsigned HOST_WIDE_INT
,
448 rtx (*) (PTR
, HOST_WIDE_INT
,
452 /* Generate several move instructions to store LEN bytes generated by
453 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
454 pointer which will be passed as argument in every CONSTFUN call.
455 ALIGN is maximum alignment we can assume. */
456 extern void store_by_pieces
PARAMS ((rtx
, unsigned HOST_WIDE_INT
,
457 rtx (*) (PTR
, HOST_WIDE_INT
,
461 /* Emit insns to set X from Y. */
462 extern rtx emit_move_insn
PARAMS ((rtx
, rtx
));
464 /* Emit insns to set X from Y, with no frills. */
465 extern rtx emit_move_insn_1
PARAMS ((rtx
, rtx
));
467 /* Push a block of length SIZE (perhaps variable)
468 and return an rtx to address the beginning of the block. */
469 extern rtx push_block
PARAMS ((rtx
, int, int));
472 /* Generate code to push something onto the stack, given its mode and type. */
473 extern void emit_push_insn
PARAMS ((rtx
, enum machine_mode
, tree
, rtx
,
474 unsigned int, int, rtx
, int, rtx
, rtx
,
477 /* Expand an assignment that stores the value of FROM into TO. */
478 extern rtx expand_assignment
PARAMS ((tree
, tree
, int, int));
480 /* Generate code for computing expression EXP,
481 and storing the value into TARGET.
482 If SUGGEST_REG is nonzero, copy the value through a register
483 and return that register, if that is possible. */
484 extern rtx store_expr
PARAMS ((tree
, rtx
, int));
487 /* Given an rtx that may include add and multiply operations,
488 generate them as insns and return a pseudo-reg containing the value.
489 Useful after calling expand_expr with 1 as sum_ok. */
490 extern rtx force_operand
PARAMS ((rtx
, rtx
));
492 /* Return an object on the placeholder list that matches EXP, a
493 PLACEHOLDER_EXPR. An object "matches" if it is of the type of the
494 PLACEHOLDER_EXPR or a pointer type to it. For further information, see
495 tree.def. If no such object is found, abort. If PLIST is nonzero, it is
496 a location which initially points to a starting location in the
497 placeholder list (zero means start of the list) and where a pointer into
498 the placeholder list at which the object is found is placed. */
499 extern tree find_placeholder
PARAMS ((tree
, tree
*));
501 /* Generate code for computing expression EXP.
502 An rtx for the computed value is returned. The value is never null.
503 In the case of a void EXP, const0_rtx is returned. */
504 extern rtx expand_expr
PARAMS ((tree
, rtx
, enum machine_mode
,
505 enum expand_modifier
));
507 /* At the start of a function, record that we have no previously-pushed
508 arguments waiting to be popped. */
509 extern void init_pending_stack_adjust
PARAMS ((void));
511 /* When exiting from function, if safe, clear out any pending stack adjust
512 so the adjustment won't get done. */
513 extern void clear_pending_stack_adjust
PARAMS ((void));
515 /* Pop any previously-pushed arguments that have not been popped yet. */
516 extern void do_pending_stack_adjust
PARAMS ((void));
519 /* Return the tree node and offset if a given argument corresponds to
520 a string constant. */
521 extern tree string_constant
PARAMS ((tree
, tree
*));
523 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
524 extern void jumpifnot
PARAMS ((tree
, rtx
));
526 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
527 extern void jumpif
PARAMS ((tree
, rtx
));
529 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
530 the result is zero, or IF_TRUE_LABEL if the result is one. */
531 extern void do_jump
PARAMS ((tree
, rtx
, rtx
));
534 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
535 extern rtx compare_from_rtx
PARAMS ((rtx
, rtx
, enum rtx_code
, int,
536 enum machine_mode
, rtx
));
537 extern void do_compare_rtx_and_jump
PARAMS ((rtx
, rtx
, enum rtx_code
, int,
538 enum machine_mode
, rtx
,
541 /* Two different ways of generating switch statements. */
542 extern int try_casesi
PARAMS ((tree
, tree
, tree
, tree
, rtx
, rtx
));
543 extern int try_tablejump
PARAMS ((tree
, tree
, tree
, tree
, rtx
, rtx
));
545 /* Smallest number of adjacent cases before we use a jump table.
546 XXX Should be a target hook. */
547 extern unsigned int case_values_threshold
PARAMS ((void));
551 /* rtl.h and tree.h were included. */
552 /* Return an rtx for the size in bytes of the value of an expr. */
553 extern rtx expr_size
PARAMS ((tree
));
555 /* Return a wide integer for the size in bytes of the value of EXP, or -1
556 if the size can vary or is larger than an integer. */
557 extern HOST_WIDE_INT int_expr_size
PARAMS ((tree
));
559 extern rtx lookup_static_chain
PARAMS ((tree
));
561 /* Convert a stack slot address ADDR valid in function FNDECL
562 into an address valid in this function (using a static chain). */
563 extern rtx fix_lexical_addr
PARAMS ((rtx
, tree
));
565 /* Return the address of the trampoline for entering nested fn FUNCTION. */
566 extern rtx trampoline_address
PARAMS ((tree
));
568 /* Return an rtx that refers to the value returned by a function
569 in its original home. This becomes invalid if any more code is emitted. */
570 extern rtx hard_function_value
PARAMS ((tree
, tree
, int));
572 extern rtx prepare_call_address
PARAMS ((rtx
, tree
, rtx
*, int, int));
574 extern rtx expand_call
PARAMS ((tree
, rtx
, int));
576 extern rtx expand_shift
PARAMS ((enum tree_code
, enum machine_mode
, rtx
, tree
,
578 extern rtx expand_divmod
PARAMS ((int, enum tree_code
, enum machine_mode
, rtx
,
580 extern void locate_and_pad_parm
PARAMS ((enum machine_mode
, tree
, int, tree
,
584 struct args_size
*));
585 extern rtx expand_inline_function
PARAMS ((tree
, tree
, rtx
, int, tree
, rtx
));
587 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
588 extern rtx label_rtx
PARAMS ((tree
));
591 /* Indicate how an input argument register was promoted. */
592 extern rtx promoted_input_arg
PARAMS ((unsigned int, enum machine_mode
*,
595 /* Return an rtx like arg but sans any constant terms.
596 Returns the original rtx if it has no constant terms.
597 The constant terms are added and stored via a second arg. */
598 extern rtx eliminate_constant_term
PARAMS ((rtx
, rtx
*));
600 /* Convert arg to a valid memory address for specified machine mode,
601 by emitting insns to perform arithmetic if nec. */
602 extern rtx memory_address
PARAMS ((enum machine_mode
, rtx
));
604 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
605 extern rtx memory_address_noforce
PARAMS ((enum machine_mode
, rtx
));
607 /* Set the alias set of MEM to SET. */
608 extern void set_mem_alias_set
PARAMS ((rtx
, HOST_WIDE_INT
));
610 /* Set the alignment of MEM to ALIGN bits. */
611 extern void set_mem_align
PARAMS ((rtx
, unsigned int));
613 /* Set the expr for MEM to EXPR. */
614 extern void set_mem_expr
PARAMS ((rtx
, tree
));
616 /* Set the offset for MEM to OFFSET. */
617 extern void set_mem_offset
PARAMS ((rtx
, rtx
));
619 /* Set the size for MEM to SIZE. */
620 extern void set_mem_size
PARAMS ((rtx
, rtx
));
622 /* Return a memory reference like MEMREF, but with its mode changed
623 to MODE and its address changed to ADDR.
624 (VOIDmode means don't change the mode.
625 NULL for ADDR means don't change the address.) */
626 extern rtx change_address
PARAMS ((rtx
, enum machine_mode
, rtx
));
628 /* Return a memory reference like MEMREF, but with its mode changed
629 to MODE and its address offset by OFFSET bytes. */
630 #define adjust_address(MEMREF, MODE, OFFSET) \
631 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
633 /* Likewise, but the reference is not required to be valid. */
634 #define adjust_address_nv(MEMREF, MODE, OFFSET) \
635 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
637 /* Return a memory reference like MEMREF, but with its mode changed
638 to MODE and its address changed to ADDR, which is assumed to be
639 increased by OFFSET bytes from MEMREF. */
640 #define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
641 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
643 /* Likewise, but the reference is not required to be valid. */
644 #define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
645 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
647 extern rtx adjust_address_1
PARAMS ((rtx
, enum machine_mode
, HOST_WIDE_INT
,
649 extern rtx adjust_automodify_address_1
PARAMS ((rtx
, enum machine_mode
,
650 rtx
, HOST_WIDE_INT
, int));
652 /* Return a memory reference like MEMREF, but whose address is changed by
653 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
654 known to be in OFFSET (possibly 1). */
655 extern rtx offset_address
PARAMS ((rtx
, rtx
, HOST_WIDE_INT
));
657 /* Return a memory reference like MEMREF, but with its address changed to
658 ADDR. The caller is asserting that the actual piece of memory pointed
659 to is the same, just the form of the address is being changed, such as
660 by putting something into a register. */
661 extern rtx replace_equiv_address
PARAMS ((rtx
, rtx
));
663 /* Likewise, but the reference is not required to be valid. */
664 extern rtx replace_equiv_address_nv
PARAMS ((rtx
, rtx
));
666 /* Return a memory reference like MEMREF, but with its mode widened to
667 MODE and adjusted by OFFSET. */
668 extern rtx widen_memory_access
PARAMS ((rtx
, enum machine_mode
, HOST_WIDE_INT
));
670 /* Return a memory reference like MEMREF, but which is known to have a
672 extern rtx validize_mem
PARAMS ((rtx
));
675 /* Given REF, either a MEM or a REG, and T, either the type of X or
676 the expression corresponding to REF, set RTX_UNCHANGING_P if
678 extern void maybe_set_unchanging
PARAMS ((rtx
, tree
));
680 /* Given REF, a MEM, and T, either the type of X or the expression
681 corresponding to REF, set the memory attributes. OBJECTP is nonzero
682 if we are making a new object of this type. */
683 extern void set_mem_attributes
PARAMS ((rtx
, tree
, int));
685 /* Similar, except that BITPOS has not yet been applied to REF, so if
686 we alter MEM_OFFSET according to T then we should subtract BITPOS
687 expecting that it'll be added back in later. */
688 extern void set_mem_attributes_minus_bitpos
PARAMS ((rtx
, tree
, int,
692 /* Assemble the static constant template for function entry trampolines. */
693 extern rtx assemble_trampoline_template
PARAMS ((void));
695 /* Given rtx, return new rtx whose address won't be affected by
696 any side effects. It has been copied to a new temporary reg. */
697 extern rtx stabilize
PARAMS ((rtx
));
699 /* Given an rtx, copy all regs it refers to into new temps
700 and return a modified copy that refers to the new temps. */
701 extern rtx copy_all_regs
PARAMS ((rtx
));
703 /* Copy given rtx to a new temp reg and return that. */
704 extern rtx copy_to_reg
PARAMS ((rtx
));
706 /* Like copy_to_reg but always make the reg Pmode. */
707 extern rtx copy_addr_to_reg
PARAMS ((rtx
));
709 /* Like copy_to_reg but always make the reg the specified mode MODE. */
710 extern rtx copy_to_mode_reg
PARAMS ((enum machine_mode
, rtx
));
712 /* Copy given rtx to given temp reg and return that. */
713 extern rtx copy_to_suggested_reg
PARAMS ((rtx
, rtx
, enum machine_mode
));
715 /* Copy a value to a register if it isn't already a register.
716 Args are mode (in case value is a constant) and the value. */
717 extern rtx force_reg
PARAMS ((enum machine_mode
, rtx
));
719 /* Return given rtx, copied into a new temp reg if it was in memory. */
720 extern rtx force_not_mem
PARAMS ((rtx
));
723 /* Return mode and signedness to use when object is promoted. */
724 extern enum machine_mode promote_mode
PARAMS ((tree
, enum machine_mode
,
728 /* Remove some bytes from the stack. An rtx says how many. */
729 extern void adjust_stack
PARAMS ((rtx
));
731 /* Add some bytes to the stack. An rtx says how many. */
732 extern void anti_adjust_stack
PARAMS ((rtx
));
734 /* This enum is used for the following two functions. */
735 enum save_level
{SAVE_BLOCK
, SAVE_FUNCTION
, SAVE_NONLOCAL
};
737 /* Save the stack pointer at the specified level. */
738 extern void emit_stack_save
PARAMS ((enum save_level
, rtx
*, rtx
));
740 /* Restore the stack pointer from a save area of the specified level. */
741 extern void emit_stack_restore
PARAMS ((enum save_level
, rtx
, rtx
));
743 /* Allocate some space on the stack dynamically and return its address. An rtx
744 says how many bytes. */
745 extern rtx allocate_dynamic_stack_space
PARAMS ((rtx
, rtx
, int));
747 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
748 FIRST is a constant and size is a Pmode RTX. These are offsets from the
749 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
750 subtract from the stack. If SIZE is constant, this is done
751 with a fixed number of probes. Otherwise, we must make a loop. */
752 extern void probe_stack_range
PARAMS ((HOST_WIDE_INT
, rtx
));
754 /* Return an rtx that refers to the value returned by a library call
755 in its original home. This becomes invalid if any more code is emitted. */
756 extern rtx hard_libcall_value
PARAMS ((enum machine_mode
));
758 /* Given an rtx, return an rtx for a value rounded up to a multiple
759 of STACK_BOUNDARY / BITS_PER_UNIT. */
760 extern rtx round_push
PARAMS ((rtx
));
762 /* Return the mode desired by operand N of a particular bitfield
763 insert/extract insn, or MAX_MACHINE_MODE if no such insn is
766 enum extraction_pattern
{ EP_insv
, EP_extv
, EP_extzv
};
767 extern enum machine_mode
768 mode_for_extraction
PARAMS ((enum extraction_pattern
, int));
770 extern rtx store_bit_field
PARAMS ((rtx
, unsigned HOST_WIDE_INT
,
771 unsigned HOST_WIDE_INT
,
772 enum machine_mode
, rtx
, HOST_WIDE_INT
));
773 extern rtx extract_bit_field
PARAMS ((rtx
, unsigned HOST_WIDE_INT
,
774 unsigned HOST_WIDE_INT
, int, rtx
,
775 enum machine_mode
, enum machine_mode
,
777 extern rtx expand_mult
PARAMS ((enum machine_mode
, rtx
, rtx
, rtx
, int));
778 extern bool const_mult_add_overflow_p
PARAMS ((rtx
, rtx
, rtx
, enum machine_mode
, int));
779 extern rtx expand_mult_add
PARAMS ((rtx
, rtx
, rtx
, rtx
,enum machine_mode
, int));
780 extern rtx expand_mult_highpart_adjust
PARAMS ((enum machine_mode
, rtx
, rtx
, rtx
, rtx
, int));
782 extern rtx assemble_static_space
PARAMS ((int));
784 /* Hook called by expand_expr for language-specific tree codes.
785 It is up to the language front end to install a hook
786 if it has any such codes that expand_expr needs to know about. */
787 extern rtx (*lang_expand_expr
) PARAMS ((union tree_node
*, rtx
,
789 enum expand_modifier modifier
));
791 extern int safe_from_p
PARAMS ((rtx
, tree
, int));
793 /* Call this once to initialize the contents of the optabs
794 appropriately for the current target machine. */
795 extern void init_optabs
PARAMS ((void));
796 extern void init_all_optabs
PARAMS ((void));
798 /* Call this to initialize an optab function entry. */
799 extern rtx init_one_libfunc
PARAMS ((const char *));
801 extern void do_jump_by_parts_equality_rtx
PARAMS ((rtx
, rtx
, rtx
));
802 extern void do_jump_by_parts_greater_rtx
PARAMS ((enum machine_mode
,
806 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
807 extern void mark_seen_cases
PARAMS ((tree
, unsigned char *,
808 HOST_WIDE_INT
, int));
811 extern int vector_mode_valid_p
PARAMS ((enum machine_mode
));