1 /* Definitions for code generation pass of GNU compiler.
2 Copyright (C) 1987, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
27 /* The default branch cost is 1. */
32 /* Macros to access the slots of a QUEUED rtx.
33 Here rather than in rtl.h because only the expansion pass
34 should ever encounter a QUEUED. */
36 /* The variable for which an increment is queued. */
37 #define QUEUED_VAR(P) XEXP (P, 0)
38 /* If the increment has been emitted, this is the insn
39 that does the increment. It is zero before the increment is emitted. */
40 #define QUEUED_INSN(P) XEXP (P, 1)
41 /* If a pre-increment copy has been generated, this is the copy
42 (it is a temporary reg). Zero if no copy made yet. */
43 #define QUEUED_COPY(P) XEXP (P, 2)
44 /* This is the body to use for the insn to do the increment.
45 It is used to emit the increment. */
46 #define QUEUED_BODY(P) XEXP (P, 3)
47 /* Next QUEUED in the queue. */
48 #define QUEUED_NEXT(P) XEXP (P, 4)
50 /* This is the 4th arg to `expand_expr'.
51 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
52 EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
53 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
54 is a constant that is not a legitimate address. */
55 enum expand_modifier
{EXPAND_NORMAL
, EXPAND_SUM
,
56 EXPAND_CONST_ADDRESS
, EXPAND_INITIALIZER
};
58 /* List of labels that must never be deleted. */
59 extern rtx forced_labels
;
61 /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
62 So we can mark them all live at the end of the function, if stupid. */
63 extern rtx save_expr_regs
;
65 extern int current_function_calls_alloca
;
66 extern int current_function_outgoing_args_size
;
68 /* This is the offset from the arg pointer to the place where the first
69 anonymous arg can be found, if there is one. */
70 extern rtx current_function_arg_offset_rtx
;
72 /* This is nonzero if the current function uses the constant pool. */
73 extern int current_function_uses_const_pool
;
75 /* This is nonzero if the current function uses pic_offset_table_rtx. */
76 extern int current_function_uses_pic_offset_table
;
78 /* The arg pointer hard register, or the pseudo into which it was copied. */
79 extern rtx current_function_internal_arg_pointer
;
81 /* Nonzero means stack pops must not be deferred, and deferred stack
82 pops must not be output. It is nonzero inside a function call,
83 inside a conditional expression, inside a statement expression,
84 and in other cases as well. */
85 extern int inhibit_defer_pop
;
87 /* Number of function calls seen so far in current function. */
89 extern int function_call_count
;
91 /* RTX for stack slot that holds the current handler for nonlocal gotos.
92 Zero when function does not have nonlocal labels. */
94 extern rtx nonlocal_goto_handler_slot
;
96 /* RTX for stack slot that holds the stack pointer value to restore
98 Zero when function does not have nonlocal labels. */
100 extern rtx nonlocal_goto_stack_level
;
102 /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
103 (labels to which there can be nonlocal gotos from nested functions)
106 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
107 extern tree nonlocal_labels
;
110 #define NO_DEFER_POP (inhibit_defer_pop += 1)
111 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
113 /* Number of units that we should eventually pop off the stack.
114 These are the arguments to function calls that have already returned. */
115 extern int pending_stack_adjust
;
117 /* A list of all cleanups which belong to the arguments of
118 function calls being expanded by expand_call. */
119 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
120 extern tree cleanups_this_call
;
123 /* When temporaries are created by TARGET_EXPRs, they are created at
124 this level of temp_slot_level, so that they can remain allocated
125 until no longer needed. CLEANUP_POINT_EXPRs define the lifetime
127 extern int target_temp_slot_level
;
129 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
130 /* Structure to record the size of a sequence of arguments
131 as the sum of a tree-expression and a constant. */
140 /* Add the value of the tree INC to the `struct args_size' TO. */
142 #define ADD_PARM_SIZE(TO, INC) \
143 { tree inc = (INC); \
144 if (TREE_CODE (inc) == INTEGER_CST) \
145 (TO).constant += TREE_INT_CST_LOW (inc); \
146 else if ((TO).var == 0) \
149 (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
151 #define SUB_PARM_SIZE(TO, DEC) \
152 { tree dec = (DEC); \
153 if (TREE_CODE (dec) == INTEGER_CST) \
154 (TO).constant -= TREE_INT_CST_LOW (dec); \
155 else if ((TO).var == 0) \
156 (TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
158 (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
160 /* Convert the implicit sum in a `struct args_size' into an rtx. */
161 #define ARGS_SIZE_RTX(SIZE) \
162 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
163 : expand_expr (size_binop (PLUS_EXPR, (SIZE).var, \
164 size_int ((SIZE).constant)), \
165 NULL_RTX, VOIDmode, 0))
167 /* Convert the implicit sum in a `struct args_size' into a tree. */
168 #define ARGS_SIZE_TREE(SIZE) \
169 ((SIZE).var == 0 ? size_int ((SIZE).constant) \
170 : size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
172 /* Supply a default definition for FUNCTION_ARG_PADDING:
173 usually pad upward, but pad short args downward on
174 big-endian machines. */
176 enum direction
{none
, upward
, downward
}; /* Value has this type. */
178 #ifndef FUNCTION_ARG_PADDING
179 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
180 (! BYTES_BIG_ENDIAN \
182 : (((MODE) == BLKmode \
183 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
184 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
185 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
186 ? downward : upward))
189 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
190 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
193 #ifndef FUNCTION_ARG_BOUNDARY
194 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
197 /* Nonzero if we do not know how to pass TYPE solely in registers.
198 We cannot do so in the following cases:
200 - if the type has variable size
201 - if the type is marked as addressable (it is required to be constructed
203 - if the padding and mode of the type is such that a copy into a register
204 would put it into the wrong part of the register.
206 Which padding can't be supported depends on the byte endianness.
208 A value in a register is implicitly padded at the most significant end.
209 On a big-endian machine, that is the lower end in memory.
210 So a value padded in memory at the upper end can't go in a register.
211 For a little-endian machine, the reverse is true. */
213 #define MUST_PASS_IN_STACK(MODE,TYPE) \
215 && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
216 || TREE_ADDRESSABLE (TYPE) \
217 || ((MODE) == BLKmode \
218 && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
219 && 0 == (int_size_in_bytes (TYPE) \
220 % (PARM_BOUNDARY / BITS_PER_UNIT))) \
221 && (FUNCTION_ARG_PADDING (MODE, TYPE) \
222 == (BYTES_BIG_ENDIAN ? upward : downward)))))
224 /* Nonzero if type TYPE should be returned in memory.
225 Most machines can use the following default definition. */
227 #ifndef RETURN_IN_MEMORY
228 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
231 /* Optabs are tables saying how to generate insn bodies
232 for various machine modes and numbers of operands.
233 Each optab applies to one operation.
234 For example, add_optab applies to addition.
236 The insn_code slot is the enum insn_code that says how to
237 generate an insn for this operation on a particular machine mode.
238 It is CODE_FOR_nothing if there is no such insn on the target machine.
240 The `lib_call' slot is the name of the library function that
241 can be used to perform the operation.
243 A few optabs, such as move_optab and cmp_optab, are used
246 /* Everything that uses expr.h needs to define enum insn_code
247 but we don't list it in the Makefile dependencies just for that. */
248 #include "insn-codes.h"
254 enum insn_code insn_code
;
256 } handlers
[NUM_MACHINE_MODES
];
259 /* Given an enum insn_code, access the function to construct
260 the body of that kind of insn. */
261 #ifdef FUNCTION_CONVERSION_BUG
262 /* Some compilers fail to convert a function properly to a
263 pointer-to-function when used as an argument.
264 So produce the pointer-to-function directly.
265 Luckily, these compilers seem to work properly when you
266 call the pointer-to-function. */
267 #define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
269 #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
272 extern rtx (*const insn_gen_function
[]) ();
274 extern optab add_optab
;
275 extern optab sub_optab
;
276 extern optab smul_optab
; /* Signed and floating-point multiply */
277 extern optab smul_highpart_optab
; /* Signed multiply, return high word */
278 extern optab umul_highpart_optab
;
279 extern optab smul_widen_optab
; /* Signed multiply with result
280 one machine mode wider than args */
281 extern optab umul_widen_optab
;
282 extern optab sdiv_optab
; /* Signed divide */
283 extern optab sdivmod_optab
; /* Signed divide-and-remainder in one */
284 extern optab udiv_optab
;
285 extern optab udivmod_optab
;
286 extern optab smod_optab
; /* Signed remainder */
287 extern optab umod_optab
;
288 extern optab flodiv_optab
; /* Optab for floating divide. */
289 extern optab ftrunc_optab
; /* Convert float to integer in float fmt */
290 extern optab and_optab
; /* Logical and */
291 extern optab ior_optab
; /* Logical or */
292 extern optab xor_optab
; /* Logical xor */
293 extern optab ashl_optab
; /* Arithmetic shift left */
294 extern optab ashr_optab
; /* Arithmetic shift right */
295 extern optab lshr_optab
; /* Logical shift right */
296 extern optab rotl_optab
; /* Rotate left */
297 extern optab rotr_optab
; /* Rotate right */
298 extern optab smin_optab
; /* Signed and floating-point minimum value */
299 extern optab smax_optab
; /* Signed and floating-point maximum value */
300 extern optab umin_optab
; /* Unsigned minimum value */
301 extern optab umax_optab
; /* Unsigned maximum value */
303 extern optab mov_optab
; /* Move instruction. */
304 extern optab movstrict_optab
; /* Move, preserving high part of register. */
306 extern optab cmp_optab
; /* Compare insn; two operands. */
307 extern optab tst_optab
; /* tst insn; compare one operand against 0 */
309 /* Unary operations */
310 extern optab neg_optab
; /* Negation */
311 extern optab abs_optab
; /* Abs value */
312 extern optab one_cmpl_optab
; /* Bitwise not */
313 extern optab ffs_optab
; /* Find first bit set */
314 extern optab sqrt_optab
; /* Square root */
315 extern optab sin_optab
; /* Sine */
316 extern optab cos_optab
; /* Cosine */
317 extern optab strlen_optab
; /* String length */
319 /* Tables of patterns for extending one integer mode to another. */
320 extern enum insn_code extendtab
[MAX_MACHINE_MODE
][MAX_MACHINE_MODE
][2];
322 /* Tables of patterns for converting between fixed and floating point. */
323 extern enum insn_code fixtab
[NUM_MACHINE_MODES
][NUM_MACHINE_MODES
][2];
324 extern enum insn_code fixtrunctab
[NUM_MACHINE_MODES
][NUM_MACHINE_MODES
][2];
325 extern enum insn_code floattab
[NUM_MACHINE_MODES
][NUM_MACHINE_MODES
][2];
327 /* Contains the optab used for each rtx code. */
328 extern optab code_to_optab
[NUM_RTX_CODE
+ 1];
330 /* Passed to expand_binop and expand_unop to say which options to try to use
331 if the requested operation can't be open-coded on the requisite mode.
332 Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
333 Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
334 OPTAB_MUST_WIDEN says try widening and don't try anything else. */
345 /* SYMBOL_REF rtx's for the library functions that are called
346 implicitly and not via optabs. */
348 extern rtx extendsfdf2_libfunc
;
349 extern rtx extendsfxf2_libfunc
;
350 extern rtx extendsftf2_libfunc
;
351 extern rtx extenddfxf2_libfunc
;
352 extern rtx extenddftf2_libfunc
;
354 extern rtx truncdfsf2_libfunc
;
355 extern rtx truncxfsf2_libfunc
;
356 extern rtx trunctfsf2_libfunc
;
357 extern rtx truncxfdf2_libfunc
;
358 extern rtx trunctfdf2_libfunc
;
360 extern rtx memcpy_libfunc
;
361 extern rtx bcopy_libfunc
;
362 extern rtx memcmp_libfunc
;
363 extern rtx bcmp_libfunc
;
364 extern rtx memset_libfunc
;
365 extern rtx bzero_libfunc
;
367 extern rtx eqhf2_libfunc
;
368 extern rtx nehf2_libfunc
;
369 extern rtx gthf2_libfunc
;
370 extern rtx gehf2_libfunc
;
371 extern rtx lthf2_libfunc
;
372 extern rtx lehf2_libfunc
;
374 extern rtx eqsf2_libfunc
;
375 extern rtx nesf2_libfunc
;
376 extern rtx gtsf2_libfunc
;
377 extern rtx gesf2_libfunc
;
378 extern rtx ltsf2_libfunc
;
379 extern rtx lesf2_libfunc
;
381 extern rtx eqdf2_libfunc
;
382 extern rtx nedf2_libfunc
;
383 extern rtx gtdf2_libfunc
;
384 extern rtx gedf2_libfunc
;
385 extern rtx ltdf2_libfunc
;
386 extern rtx ledf2_libfunc
;
388 extern rtx eqxf2_libfunc
;
389 extern rtx nexf2_libfunc
;
390 extern rtx gtxf2_libfunc
;
391 extern rtx gexf2_libfunc
;
392 extern rtx ltxf2_libfunc
;
393 extern rtx lexf2_libfunc
;
395 extern rtx eqtf2_libfunc
;
396 extern rtx netf2_libfunc
;
397 extern rtx gttf2_libfunc
;
398 extern rtx getf2_libfunc
;
399 extern rtx lttf2_libfunc
;
400 extern rtx letf2_libfunc
;
402 extern rtx floatsisf_libfunc
;
403 extern rtx floatdisf_libfunc
;
404 extern rtx floattisf_libfunc
;
406 extern rtx floatsidf_libfunc
;
407 extern rtx floatdidf_libfunc
;
408 extern rtx floattidf_libfunc
;
410 extern rtx floatsixf_libfunc
;
411 extern rtx floatdixf_libfunc
;
412 extern rtx floattixf_libfunc
;
414 extern rtx floatsitf_libfunc
;
415 extern rtx floatditf_libfunc
;
416 extern rtx floattitf_libfunc
;
418 extern rtx fixsfsi_libfunc
;
419 extern rtx fixsfdi_libfunc
;
420 extern rtx fixsfti_libfunc
;
422 extern rtx fixdfsi_libfunc
;
423 extern rtx fixdfdi_libfunc
;
424 extern rtx fixdfti_libfunc
;
426 extern rtx fixxfsi_libfunc
;
427 extern rtx fixxfdi_libfunc
;
428 extern rtx fixxfti_libfunc
;
430 extern rtx fixtfsi_libfunc
;
431 extern rtx fixtfdi_libfunc
;
432 extern rtx fixtfti_libfunc
;
434 extern rtx fixunssfsi_libfunc
;
435 extern rtx fixunssfdi_libfunc
;
436 extern rtx fixunssfti_libfunc
;
438 extern rtx fixunsdfsi_libfunc
;
439 extern rtx fixunsdfdi_libfunc
;
440 extern rtx fixunsdfti_libfunc
;
442 extern rtx fixunsxfsi_libfunc
;
443 extern rtx fixunsxfdi_libfunc
;
444 extern rtx fixunsxfti_libfunc
;
446 extern rtx fixunstfsi_libfunc
;
447 extern rtx fixunstfdi_libfunc
;
448 extern rtx fixunstfti_libfunc
;
450 typedef rtx (*rtxfun
) ();
452 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
453 gives the gen_function to make a branch to test that condition. */
455 extern rtxfun bcc_gen_fctn
[NUM_RTX_CODE
];
457 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
458 gives the insn code to make a store-condition insn
459 to test that condition. */
461 extern enum insn_code setcc_gen_code
[NUM_RTX_CODE
];
463 #ifdef HAVE_conditional_move
464 /* Indexed by the the machine mode, gives the insn code to make a conditional
467 extern enum insn_code movcc_gen_code
[NUM_MACHINE_MODES
];
470 /* This array records the insn_code of insns to perform block moves. */
471 extern enum insn_code movstr_optab
[NUM_MACHINE_MODES
];
473 /* Define functions given in optabs.c. */
475 /* Expand a binary operation given optab and rtx operands. */
476 extern rtx expand_binop
PROTO((enum machine_mode
, optab
, rtx
, rtx
, rtx
,
477 int, enum optab_methods
));
479 /* Expand a binary operation with both signed and unsigned forms. */
480 extern rtx sign_expand_binop
PROTO((enum machine_mode
, optab
, optab
, rtx
,
481 rtx
, rtx
, int, enum optab_methods
));
483 /* Generate code to perform an operation on two operands with two results. */
484 extern int expand_twoval_binop
PROTO((optab
, rtx
, rtx
, rtx
, rtx
, int));
486 /* Expand a unary arithmetic operation given optab rtx operand. */
487 extern rtx expand_unop
PROTO((enum machine_mode
, optab
, rtx
, rtx
, int));
489 /* Expand the absolute value operation. */
490 extern rtx expand_abs
PROTO((enum machine_mode
, rtx
, rtx
, int, int));
492 /* Expand the complex absolute value operation. */
493 extern rtx expand_complex_abs
PROTO((enum machine_mode
, rtx
, rtx
, int));
495 /* Generate an instruction with a given INSN_CODE with an output and
497 extern void emit_unop_insn
PROTO((int, rtx
, rtx
, enum rtx_code
));
499 /* Emit code to perform a series of operations on a multi-word quantity, one
501 extern rtx emit_no_conflict_block
PROTO((rtx
, rtx
, rtx
, rtx
, rtx
));
503 /* Emit code to make a call to a constant function or a library call. */
504 extern void emit_libcall_block
PROTO((rtx
, rtx
, rtx
, rtx
));
506 /* Emit one rtl instruction to store zero in specified rtx. */
507 extern void emit_clr_insn
PROTO((rtx
));
509 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0. */
510 extern void emit_0_to_1_insn
PROTO((rtx
));
512 /* Emit one rtl insn to compare two rtx's. */
513 extern void emit_cmp_insn
PROTO((rtx
, rtx
, enum rtx_code
, rtx
,
514 enum machine_mode
, int, int));
516 /* Nonzero if a compare of mode MODE can be done straightforwardly
517 (without splitting it into pieces). */
518 extern int can_compare_p
PROTO((enum machine_mode
));
520 /* Emit a library call comparison between floating point X and Y.
521 COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.). */
522 extern void emit_float_lib_cmp
PROTO((rtx
, rtx
, enum rtx_code
));
524 /* Generate code to indirectly jump to a location given in the rtx LOC. */
525 extern void emit_indirect_jump
PROTO((rtx
));
527 #ifdef HAVE_conditional_move
528 /* Emit a conditional move operation. */
529 rtx emit_conditional_move
PROTO((rtx
, enum rtx_code
, rtx
, rtx
,
530 enum machine_mode
, rtx
, rtx
,
531 enum machine_mode
, int));
533 /* Return non-zero if the conditional move is supported. */
534 int can_conditionally_move_p
PROTO((enum machine_mode mode
));
537 /* Create but don't emit one rtl instruction to add one rtx into another.
538 Modes must match; operands must meet the operation's predicates.
539 Likewise for subtraction and for just copying.
540 These do not call protect_from_queue; caller must do so. */
541 extern rtx gen_add2_insn
PROTO((rtx
, rtx
));
542 extern rtx gen_sub2_insn
PROTO((rtx
, rtx
));
543 extern rtx gen_move_insn
PROTO((rtx
, rtx
));
544 extern int have_add2_insn
PROTO((enum machine_mode
));
545 extern int have_sub2_insn
PROTO((enum machine_mode
));
547 /* Return the INSN_CODE to use for an extend operation. */
548 extern enum insn_code can_extend_p
PROTO((enum machine_mode
,
549 enum machine_mode
, int));
551 /* Generate the body of an insn to extend Y (with mode MFROM)
552 into X (with mode MTO). Do zero-extension if UNSIGNEDP is nonzero. */
553 extern rtx gen_extend_insn
PROTO((rtx
, rtx
, enum machine_mode
,
554 enum machine_mode
, int));
556 /* Initialize the tables that control conversion between fixed and
558 extern void init_fixtab
PROTO((void));
559 extern void init_floattab
PROTO((void));
561 /* Generate code for a FLOAT_EXPR. */
562 extern void expand_float
PROTO((rtx
, rtx
, int));
564 /* Generate code for a FIX_EXPR. */
565 extern void expand_fix
PROTO((rtx
, rtx
, int));
567 /* Call this once to initialize the contents of the optabs
568 appropriately for the current target machine. */
569 extern void init_optabs
PROTO((void));
571 /* Functions from expmed.c: */
573 /* Arguments MODE, RTX: return an rtx for the negation of that value.
575 extern rtx negate_rtx
PROTO((enum machine_mode
, rtx
));
577 /* Expand a logical AND operation. */
578 extern rtx expand_and
PROTO((rtx
, rtx
, rtx
));
580 /* Emit a store-flag operation. */
581 extern rtx emit_store_flag
PROTO((rtx
, enum rtx_code
, rtx
, rtx
,
582 enum machine_mode
, int, int));
584 /* Functions from loop.c: */
586 /* Given a JUMP_INSN, return a description of the test being made. */
587 extern rtx get_condition
PROTO((rtx
, rtx
*));
589 /* Functions from expr.c: */
591 /* This is run once per compilation to set up which modes can be used
592 directly in memory and to initialize the block move optab. */
593 extern void init_expr_once
PROTO((void));
595 /* This is run at the start of compiling a function. */
596 extern void init_expr
PROTO((void));
598 /* Use protect_from_queue to convert a QUEUED expression
599 into something that you can put immediately into an instruction. */
600 extern rtx protect_from_queue
PROTO((rtx
, int));
602 /* Perform all the pending incrementations. */
603 extern void emit_queue
PROTO((void));
605 /* Emit some rtl insns to move data between rtx's, converting machine modes.
606 Both modes must be floating or both fixed. */
607 extern void convert_move
PROTO((rtx
, rtx
, int));
609 /* Convert an rtx to specified machine mode and return the result. */
610 extern rtx convert_to_mode
PROTO((enum machine_mode
, rtx
, int));
612 /* Convert an rtx to MODE from OLDMODE and return the result. */
613 extern rtx convert_modes
PROTO((enum machine_mode
, enum machine_mode
, rtx
, int));
615 /* Emit code to move a block Y to a block X. */
616 extern void emit_block_move
PROTO((rtx
, rtx
, rtx
, int));
618 /* Copy all or part of a value X into registers starting at REGNO.
619 The number of registers to be filled is NREGS. */
620 extern void move_block_to_reg
PROTO((int, rtx
, int, enum machine_mode
));
622 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
623 The number of registers to be filled is NREGS. */
624 extern void move_block_from_reg
PROTO((int, rtx
, int, int));
626 /* Mark REG as holding a parameter for the next CALL_INSN. */
627 extern void use_reg
PROTO((rtx
*, rtx
));
628 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
629 for the next CALL_INSN. */
630 extern void use_regs
PROTO((rtx
*, int, int));
632 /* Write zeros through the storage of OBJECT.
633 If OBJECT has BLKmode, SIZE is its length in bytes. */
634 extern void clear_storage
PROTO((rtx
, int));
636 /* Emit insns to set X from Y. */
637 extern rtx emit_move_insn
PROTO((rtx
, rtx
));
639 /* Emit insns to set X from Y, with no frills. */
640 extern rtx emit_move_insn_1
PROTO ((rtx
, rtx
));
642 /* Push a block of length SIZE (perhaps variable)
643 and return an rtx to address the beginning of the block. */
644 extern rtx push_block
PROTO((rtx
, int, int));
646 /* Make an operand to push something on the stack. */
647 extern rtx gen_push_operand
PROTO((void));
650 /* Generate code to push something onto the stack, given its mode and type. */
651 extern void emit_push_insn
PROTO((rtx
, enum machine_mode
, tree
, rtx
, int,
652 int, rtx
, int, rtx
, rtx
));
654 /* Emit library call. */
655 extern void emit_library_call
PVPROTO((rtx orgfun
, int no_queue
,
656 enum machine_mode outmode
, int nargs
, ...));
657 extern rtx emit_library_call_value
PVPROTO((rtx orgfun
, rtx value
, int no_queue
,
658 enum machine_mode outmode
, int nargs
, ...));
660 /* Expand an assignment that stores the value of FROM into TO. */
661 extern rtx expand_assignment
PROTO((tree
, tree
, int, int));
663 /* Generate code for computing expression EXP,
664 and storing the value into TARGET.
665 If SUGGEST_REG is nonzero, copy the value through a register
666 and return that register, if that is possible. */
667 extern rtx store_expr
PROTO((tree
, rtx
, int));
670 /* Given an rtx that may include add and multiply operations,
671 generate them as insns and return a pseudo-reg containing the value.
672 Useful after calling expand_expr with 1 as sum_ok. */
673 extern rtx force_operand
PROTO((rtx
, rtx
));
676 /* Generate code for computing expression EXP.
677 An rtx for the computed value is returned. The value is never null.
678 In the case of a void EXP, const0_rtx is returned. */
679 extern rtx expand_expr
PROTO((tree
, rtx
, enum machine_mode
,
680 enum expand_modifier
));
683 /* At the start of a function, record that we have no previously-pushed
684 arguments waiting to be popped. */
685 extern void init_pending_stack_adjust
PROTO((void));
687 /* When exiting from function, if safe, clear out any pending stack adjust
688 so the adjustment won't get done. */
689 extern void clear_pending_stack_adjust
PROTO((void));
691 /* Pop any previously-pushed arguments that have not been popped yet. */
692 extern void do_pending_stack_adjust
PROTO((void));
695 /* Expand all cleanups up to OLD_CLEANUPS. */
696 extern void expand_cleanups_to
PROTO((tree
));
698 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
699 extern void jumpifnot
PROTO((tree
, rtx
));
701 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
702 extern void jumpif
PROTO((tree
, rtx
));
704 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
705 the result is zero, or IF_TRUE_LABEL if the result is one. */
706 extern void do_jump
PROTO((tree
, rtx
, rtx
));
709 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
710 extern rtx compare_from_rtx
PROTO((rtx
, rtx
, enum rtx_code
, int,
711 enum machine_mode
, rtx
, int));
713 /* Generate a tablejump instruction (used for switch statements). */
714 extern void do_tablejump
PROTO((rtx
, enum machine_mode
, rtx
, rtx
, rtx
));
717 /* rtl.h and tree.h were included. */
718 /* Return an rtx for the size in bytes of the value of an expr. */
719 extern rtx expr_size
PROTO((tree
));
721 extern rtx lookup_static_chain
PROTO((tree
));
723 /* Convert a stack slot address ADDR valid in function FNDECL
724 into an address valid in this function (using a static chain). */
725 extern rtx fix_lexical_addr
PROTO((rtx
, tree
));
727 /* Return the address of the trampoline for entering nested fn FUNCTION. */
728 extern rtx trampoline_address
PROTO((tree
));
730 /* Return an rtx that refers to the value returned by a function
731 in its original home. This becomes invalid if any more code is emitted. */
732 extern rtx hard_function_value
PROTO((tree
, tree
));
734 extern rtx prepare_call_address
PROTO((rtx
, tree
, rtx
*, int));
736 extern rtx expand_call
PROTO((tree
, rtx
, int));
738 extern rtx expand_shift
PROTO((enum tree_code
, enum machine_mode
, rtx
, tree
, rtx
, int));
739 extern rtx expand_divmod
PROTO((int, enum tree_code
, enum machine_mode
, rtx
, rtx
, rtx
, int));
740 extern void locate_and_pad_parm
PROTO((enum machine_mode
, tree
, int, tree
, struct args_size
*, struct args_size
*, struct args_size
*));
741 extern rtx expand_inline_function
PROTO((tree
, tree
, rtx
, int, tree
, rtx
));
742 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
743 extern rtx label_rtx
PROTO((tree
));
746 /* Indicate how an input argument register was promoted. */
747 extern rtx promoted_input_arg
PROTO((int, enum machine_mode
*, int *));
749 /* Return an rtx like arg but sans any constant terms.
750 Returns the original rtx if it has no constant terms.
751 The constant terms are added and stored via a second arg. */
752 extern rtx eliminate_constant_term
PROTO((rtx
, rtx
*));
754 /* Convert arg to a valid memory address for specified machine mode,
755 by emitting insns to perform arithmetic if nec. */
756 extern rtx memory_address
PROTO((enum machine_mode
, rtx
));
758 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
759 extern rtx memory_address_noforce
PROTO((enum machine_mode
, rtx
));
761 /* Return a memory reference like MEMREF, but with its mode changed
762 to MODE and its address changed to ADDR.
763 (VOIDmode means don't change the mode.
764 NULL for ADDR means don't change the address.) */
765 extern rtx change_address
PROTO((rtx
, enum machine_mode
, rtx
));
767 /* Return a memory reference like MEMREF, but which is known to have a
770 extern rtx validize_mem
PROTO((rtx
));
772 /* Assemble the static constant template for function entry trampolines. */
773 extern rtx assemble_trampoline_template
PROTO((void));
775 /* Return 1 if two rtx's are equivalent in structure and elements. */
776 extern int rtx_equal_p
PROTO((rtx
, rtx
));
778 /* Given rtx, return new rtx whose address won't be affected by
779 any side effects. It has been copied to a new temporary reg. */
780 extern rtx stabilize
PROTO((rtx
));
782 /* Given an rtx, copy all regs it refers to into new temps
783 and return a modified copy that refers to the new temps. */
784 extern rtx copy_all_regs
PROTO((rtx
));
786 /* Copy given rtx to a new temp reg and return that. */
787 extern rtx copy_to_reg
PROTO((rtx
));
789 /* Like copy_to_reg but always make the reg Pmode. */
790 extern rtx copy_addr_to_reg
PROTO((rtx
));
792 /* Like copy_to_reg but always make the reg the specified mode MODE. */
793 extern rtx copy_to_mode_reg
PROTO((enum machine_mode
, rtx
));
795 /* Copy given rtx to given temp reg and return that. */
796 extern rtx copy_to_suggested_reg
PROTO((rtx
, rtx
, enum machine_mode
));
798 /* Copy a value to a register if it isn't already a register.
799 Args are mode (in case value is a constant) and the value. */
800 extern rtx force_reg
PROTO((enum machine_mode
, rtx
));
802 /* Return given rtx, copied into a new temp reg if it was in memory. */
803 extern rtx force_not_mem
PROTO((rtx
));
806 /* Return mode and signedness to use when object is promoted. */
807 extern enum machine_mode promote_mode
PROTO((tree
, enum machine_mode
,
811 /* Remove some bytes from the stack. An rtx says how many. */
812 extern void adjust_stack
PROTO((rtx
));
814 /* Add some bytes to the stack. An rtx says how many. */
815 extern void anti_adjust_stack
PROTO((rtx
));
817 /* This enum is used for the following two functions. */
818 enum save_level
{SAVE_BLOCK
, SAVE_FUNCTION
, SAVE_NONLOCAL
};
820 /* Save the stack pointer at the specified level. */
821 extern void emit_stack_save
PROTO((enum save_level
, rtx
*, rtx
));
823 /* Restore the stack pointer from a save area of the specified level. */
824 extern void emit_stack_restore
PROTO((enum save_level
, rtx
, rtx
));
826 /* Allocate some space on the stack dynamically and return its address. An rtx
827 says how many bytes. */
828 extern rtx allocate_dynamic_stack_space
PROTO((rtx
, rtx
, int));
830 /* Emit code to copy function value to a new temp reg and return that reg. */
831 extern rtx
function_value ();
833 /* Return an rtx that refers to the value returned by a library call
834 in its original home. This becomes invalid if any more code is emitted. */
835 extern rtx hard_libcall_value
PROTO((enum machine_mode
));
837 /* Given an rtx, return an rtx for a value rounded up to a multiple
838 of STACK_BOUNDARY / BITS_PER_UNIT. */
839 extern rtx round_push
PROTO((rtx
));
841 extern void emit_block_move
PROTO((rtx
, rtx
, rtx
, int));
843 extern rtx store_bit_field
PROTO((rtx
, int, int, enum machine_mode
, rtx
, int, int));
844 extern rtx extract_bit_field
PROTO((rtx
, int, int, int, rtx
, enum machine_mode
, enum machine_mode
, int, int));
845 extern rtx expand_mult
PROTO((enum machine_mode
, rtx
, rtx
, rtx
, int));
846 extern rtx expand_mult_add
PROTO((rtx
, rtx
, rtx
, rtx
,enum machine_mode
, int));
848 extern rtx assemble_static_space
PROTO((int));
850 /* Hook called by expand_expr for language-specific tree codes.
851 It is up to the language front end to install a hook
852 if it has any such codes that expand_expr needs to know about. */
853 extern rtx (*lang_expand_expr
) ();