1 /* Definitions for code generation pass of GNU compiler.
2 Copyright (C) 1987, 91-96, 1997 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, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* The default branch cost is 1. */
26 /* Macros to access the slots of a QUEUED rtx.
27 Here rather than in rtl.h because only the expansion pass
28 should ever encounter a QUEUED. */
30 /* The variable for which an increment is queued. */
31 #define QUEUED_VAR(P) XEXP (P, 0)
32 /* If the increment has been emitted, this is the insn
33 that does the increment. It is zero before the increment is emitted. */
34 #define QUEUED_INSN(P) XEXP (P, 1)
35 /* If a pre-increment copy has been generated, this is the copy
36 (it is a temporary reg). Zero if no copy made yet. */
37 #define QUEUED_COPY(P) XEXP (P, 2)
38 /* This is the body to use for the insn to do the increment.
39 It is used to emit the increment. */
40 #define QUEUED_BODY(P) XEXP (P, 3)
41 /* Next QUEUED in the queue. */
42 #define QUEUED_NEXT(P) XEXP (P, 4)
44 /* This is the 4th arg to `expand_expr'.
45 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
46 EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
47 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
48 is a constant that is not a legitimate address.
49 EXPAND_MEMORY_USE_* are explained below. */
50 enum expand_modifier
{EXPAND_NORMAL
, EXPAND_SUM
,
51 EXPAND_CONST_ADDRESS
, EXPAND_INITIALIZER
,
52 EXPAND_MEMORY_USE_WO
, EXPAND_MEMORY_USE_RW
,
53 EXPAND_MEMORY_USE_BAD
, EXPAND_MEMORY_USE_DONT
};
55 /* Argument for chkr_* functions.
56 MEMORY_USE_RO: the pointer reads memory.
57 MEMORY_USE_WO: the pointer writes to memory.
58 MEMORY_USE_RW: the pointer modifies memory (ie it reads and writes). An
60 MEMORY_USE_BAD: use this if you don't know the behavior of the pointer, or
61 if you know there are no pointers. Using an INDIRECT_REF
62 with MEMORY_USE_BAD will abort.
63 MEMORY_USE_TW: just test for writing, without update. Special.
64 MEMORY_USE_DONT: the memory is neither read nor written. This is used by
66 enum memory_use_mode
{MEMORY_USE_BAD
= 0, MEMORY_USE_RO
= 1,
67 MEMORY_USE_WO
= 2, MEMORY_USE_RW
= 3,
68 MEMORY_USE_TW
= 6, MEMORY_USE_DONT
= 99};
70 /* List of labels that must never be deleted. */
71 extern rtx forced_labels
;
73 /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
74 So we can mark them all live at the end of the function, if stupid. */
75 extern rtx save_expr_regs
;
77 extern int current_function_calls_alloca
;
78 extern int current_function_outgoing_args_size
;
80 /* This is the offset from the arg pointer to the place where the first
81 anonymous arg can be found, if there is one. */
82 extern rtx current_function_arg_offset_rtx
;
84 /* This is nonzero if the current function uses the constant pool. */
85 extern int current_function_uses_const_pool
;
87 /* This is nonzero if the current function uses pic_offset_table_rtx. */
88 extern int current_function_uses_pic_offset_table
;
90 /* The arg pointer hard register, or the pseudo into which it was copied. */
91 extern rtx current_function_internal_arg_pointer
;
93 /* Nonzero means stack pops must not be deferred, and deferred stack
94 pops must not be output. It is nonzero inside a function call,
95 inside a conditional expression, inside a statement expression,
96 and in other cases as well. */
97 extern int inhibit_defer_pop
;
99 /* Number of function calls seen so far in current function. */
101 extern int function_call_count
;
103 /* RTX for stack slot that holds the current handler for nonlocal gotos.
104 Zero when function does not have nonlocal labels. */
106 extern rtx nonlocal_goto_handler_slot
;
108 /* RTX for stack slot that holds the stack pointer value to restore
110 Zero when function does not have nonlocal labels. */
112 extern rtx nonlocal_goto_stack_level
;
114 /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
115 (labels to which there can be nonlocal gotos from nested functions)
118 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
119 extern tree nonlocal_labels
;
122 #define NO_DEFER_POP (inhibit_defer_pop += 1)
123 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
125 /* Number of units that we should eventually pop off the stack.
126 These are the arguments to function calls that have already returned. */
127 extern int pending_stack_adjust
;
129 /* When temporaries are created by TARGET_EXPRs, they are created at
130 this level of temp_slot_level, so that they can remain allocated
131 until no longer needed. CLEANUP_POINT_EXPRs define the lifetime
133 extern int target_temp_slot_level
;
135 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
136 /* Structure to record the size of a sequence of arguments
137 as the sum of a tree-expression and a constant. */
146 /* Add the value of the tree INC to the `struct args_size' TO. */
148 #define ADD_PARM_SIZE(TO, INC) \
149 { tree inc = (INC); \
150 if (TREE_CODE (inc) == INTEGER_CST) \
151 (TO).constant += TREE_INT_CST_LOW (inc); \
152 else if ((TO).var == 0) \
155 (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
157 #define SUB_PARM_SIZE(TO, DEC) \
158 { tree dec = (DEC); \
159 if (TREE_CODE (dec) == INTEGER_CST) \
160 (TO).constant -= TREE_INT_CST_LOW (dec); \
161 else if ((TO).var == 0) \
162 (TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
164 (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
166 /* Convert the implicit sum in a `struct args_size' into an rtx. */
167 #define ARGS_SIZE_RTX(SIZE) \
168 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
169 : expand_expr (size_binop (PLUS_EXPR, (SIZE).var, \
170 size_int ((SIZE).constant)), \
171 NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD))
173 /* Convert the implicit sum in a `struct args_size' into a tree. */
174 #define ARGS_SIZE_TREE(SIZE) \
175 ((SIZE).var == 0 ? size_int ((SIZE).constant) \
176 : size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
178 /* Supply a default definition for FUNCTION_ARG_PADDING:
179 usually pad upward, but pad short args downward on
180 big-endian machines. */
182 enum direction
{none
, upward
, downward
}; /* Value has this type. */
184 #ifndef FUNCTION_ARG_PADDING
185 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
186 (! BYTES_BIG_ENDIAN \
188 : (((MODE) == BLKmode \
189 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
190 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
191 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
192 ? downward : upward))
195 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
196 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
199 #ifndef FUNCTION_ARG_BOUNDARY
200 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
203 /* Nonzero if we do not know how to pass TYPE solely in registers.
204 We cannot do so in the following cases:
206 - if the type has variable size
207 - if the type is marked as addressable (it is required to be constructed
209 - if the padding and mode of the type is such that a copy into a register
210 would put it into the wrong part of the register.
212 Which padding can't be supported depends on the byte endianness.
214 A value in a register is implicitly padded at the most significant end.
215 On a big-endian machine, that is the lower end in memory.
216 So a value padded in memory at the upper end can't go in a register.
217 For a little-endian machine, the reverse is true. */
219 #ifndef MUST_PASS_IN_STACK
220 #define MUST_PASS_IN_STACK(MODE,TYPE) \
222 && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
223 || TREE_ADDRESSABLE (TYPE) \
224 || ((MODE) == BLKmode \
225 && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
226 && 0 == (int_size_in_bytes (TYPE) \
227 % (PARM_BOUNDARY / BITS_PER_UNIT))) \
228 && (FUNCTION_ARG_PADDING (MODE, TYPE) \
229 == (BYTES_BIG_ENDIAN ? upward : downward)))))
232 /* Nonzero if type TYPE should be returned in memory.
233 Most machines can use the following default definition. */
235 #ifndef RETURN_IN_MEMORY
236 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
239 /* Provide default values for the macros controlling stack checking. */
241 #ifndef STACK_CHECK_BUILTIN
242 #define STACK_CHECK_BUILTIN 0
245 /* The default interval is one page. */
246 #ifndef STACK_CHECK_PROBE_INTERVAL
247 #define STACK_CHECK_PROBE_INTERVAL 4096
250 /* The default is to do a store into the stack. */
251 #ifndef STACK_CHECK_PROBE_LOAD
252 #define STACK_CHECK_PROBE_LOAD 0
255 /* This value is arbitrary, but should be sufficient for most machines. */
256 #ifndef STACK_CHECK_PROTECT
257 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
260 /* Make the maximum frame size be the largest we can and still only need
261 one probe per function. */
262 #ifndef STACK_CHECK_MAX_FRAME_SIZE
263 #define STACK_CHECK_MAX_FRAME_SIZE \
264 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
267 /* This is arbitrary, but should be large enough everywhere. */
268 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
269 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
272 /* Provide a reasonable default for the maximum size of an object to
273 allocate in the fixed frame. We may need to be able to make this
274 controllable by the user at some point. */
275 #ifndef STACK_CHECK_MAX_VAR_SIZE
276 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
279 /* Optabs are tables saying how to generate insn bodies
280 for various machine modes and numbers of operands.
281 Each optab applies to one operation.
282 For example, add_optab applies to addition.
284 The insn_code slot is the enum insn_code that says how to
285 generate an insn for this operation on a particular machine mode.
286 It is CODE_FOR_nothing if there is no such insn on the target machine.
288 The `lib_call' slot is the name of the library function that
289 can be used to perform the operation.
291 A few optabs, such as move_optab and cmp_optab, are used
294 /* Everything that uses expr.h needs to define enum insn_code
295 but we don't list it in the Makefile dependencies just for that. */
296 #include "insn-codes.h"
302 enum insn_code insn_code
;
304 } handlers
[NUM_MACHINE_MODES
];
307 /* Given an enum insn_code, access the function to construct
308 the body of that kind of insn. */
309 #ifdef FUNCTION_CONVERSION_BUG
310 /* Some compilers fail to convert a function properly to a
311 pointer-to-function when used as an argument.
312 So produce the pointer-to-function directly.
313 Luckily, these compilers seem to work properly when you
314 call the pointer-to-function. */
315 #define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
317 #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
320 extern rtx (*const insn_gen_function
[]) PROTO ((rtx
, ...));
322 extern optab add_optab
;
323 extern optab sub_optab
;
324 extern optab smul_optab
; /* Signed and floating-point multiply */
325 extern optab smul_highpart_optab
; /* Signed multiply, return high word */
326 extern optab umul_highpart_optab
;
327 extern optab smul_widen_optab
; /* Signed multiply with result
328 one machine mode wider than args */
329 extern optab umul_widen_optab
;
330 extern optab sdiv_optab
; /* Signed divide */
331 extern optab sdivmod_optab
; /* Signed divide-and-remainder in one */
332 extern optab udiv_optab
;
333 extern optab udivmod_optab
;
334 extern optab smod_optab
; /* Signed remainder */
335 extern optab umod_optab
;
336 extern optab flodiv_optab
; /* Optab for floating divide. */
337 extern optab ftrunc_optab
; /* Convert float to integer in float fmt */
338 extern optab and_optab
; /* Logical and */
339 extern optab ior_optab
; /* Logical or */
340 extern optab xor_optab
; /* Logical xor */
341 extern optab ashl_optab
; /* Arithmetic shift left */
342 extern optab ashr_optab
; /* Arithmetic shift right */
343 extern optab lshr_optab
; /* Logical shift right */
344 extern optab rotl_optab
; /* Rotate left */
345 extern optab rotr_optab
; /* Rotate right */
346 extern optab smin_optab
; /* Signed and floating-point minimum value */
347 extern optab smax_optab
; /* Signed and floating-point maximum value */
348 extern optab umin_optab
; /* Unsigned minimum value */
349 extern optab umax_optab
; /* Unsigned maximum value */
351 extern optab mov_optab
; /* Move instruction. */
352 extern optab movstrict_optab
; /* Move, preserving high part of register. */
354 extern optab cmp_optab
; /* Compare insn; two operands. */
355 extern optab tst_optab
; /* tst insn; compare one operand against 0 */
357 /* Unary operations */
358 extern optab neg_optab
; /* Negation */
359 extern optab abs_optab
; /* Abs value */
360 extern optab one_cmpl_optab
; /* Bitwise not */
361 extern optab ffs_optab
; /* Find first bit set */
362 extern optab sqrt_optab
; /* Square root */
363 extern optab sin_optab
; /* Sine */
364 extern optab cos_optab
; /* Cosine */
365 extern optab strlen_optab
; /* String length */
367 /* Tables of patterns for extending one integer mode to another. */
368 extern enum insn_code extendtab
[MAX_MACHINE_MODE
][MAX_MACHINE_MODE
][2];
370 /* Tables of patterns for converting between fixed and floating point. */
371 extern enum insn_code fixtab
[NUM_MACHINE_MODES
][NUM_MACHINE_MODES
][2];
372 extern enum insn_code fixtrunctab
[NUM_MACHINE_MODES
][NUM_MACHINE_MODES
][2];
373 extern enum insn_code floattab
[NUM_MACHINE_MODES
][NUM_MACHINE_MODES
][2];
375 /* Contains the optab used for each rtx code. */
376 extern optab code_to_optab
[NUM_RTX_CODE
+ 1];
378 /* Passed to expand_binop and expand_unop to say which options to try to use
379 if the requested operation can't be open-coded on the requisite mode.
380 Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
381 Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
382 OPTAB_MUST_WIDEN says try widening and don't try anything else. */
393 /* SYMBOL_REF rtx's for the library functions that are called
394 implicitly and not via optabs. */
396 extern rtx extendsfdf2_libfunc
;
397 extern rtx extendsfxf2_libfunc
;
398 extern rtx extendsftf2_libfunc
;
399 extern rtx extenddfxf2_libfunc
;
400 extern rtx extenddftf2_libfunc
;
402 extern rtx truncdfsf2_libfunc
;
403 extern rtx truncxfsf2_libfunc
;
404 extern rtx trunctfsf2_libfunc
;
405 extern rtx truncxfdf2_libfunc
;
406 extern rtx trunctfdf2_libfunc
;
408 extern rtx memcpy_libfunc
;
409 extern rtx bcopy_libfunc
;
410 extern rtx memcmp_libfunc
;
411 extern rtx bcmp_libfunc
;
412 extern rtx memset_libfunc
;
413 extern rtx bzero_libfunc
;
415 extern rtx throw_libfunc
;
416 extern rtx sjthrow_libfunc
;
417 extern rtx sjpopnthrow_libfunc
;
418 extern rtx terminate_libfunc
;
419 extern rtx setjmp_libfunc
;
420 extern rtx longjmp_libfunc
;
422 extern rtx eqhf2_libfunc
;
423 extern rtx nehf2_libfunc
;
424 extern rtx gthf2_libfunc
;
425 extern rtx gehf2_libfunc
;
426 extern rtx lthf2_libfunc
;
427 extern rtx lehf2_libfunc
;
429 extern rtx eqsf2_libfunc
;
430 extern rtx nesf2_libfunc
;
431 extern rtx gtsf2_libfunc
;
432 extern rtx gesf2_libfunc
;
433 extern rtx ltsf2_libfunc
;
434 extern rtx lesf2_libfunc
;
436 extern rtx eqdf2_libfunc
;
437 extern rtx nedf2_libfunc
;
438 extern rtx gtdf2_libfunc
;
439 extern rtx gedf2_libfunc
;
440 extern rtx ltdf2_libfunc
;
441 extern rtx ledf2_libfunc
;
443 extern rtx eqxf2_libfunc
;
444 extern rtx nexf2_libfunc
;
445 extern rtx gtxf2_libfunc
;
446 extern rtx gexf2_libfunc
;
447 extern rtx ltxf2_libfunc
;
448 extern rtx lexf2_libfunc
;
450 extern rtx eqtf2_libfunc
;
451 extern rtx netf2_libfunc
;
452 extern rtx gttf2_libfunc
;
453 extern rtx getf2_libfunc
;
454 extern rtx lttf2_libfunc
;
455 extern rtx letf2_libfunc
;
457 extern rtx floatsisf_libfunc
;
458 extern rtx floatdisf_libfunc
;
459 extern rtx floattisf_libfunc
;
461 extern rtx floatsidf_libfunc
;
462 extern rtx floatdidf_libfunc
;
463 extern rtx floattidf_libfunc
;
465 extern rtx floatsixf_libfunc
;
466 extern rtx floatdixf_libfunc
;
467 extern rtx floattixf_libfunc
;
469 extern rtx floatsitf_libfunc
;
470 extern rtx floatditf_libfunc
;
471 extern rtx floattitf_libfunc
;
473 extern rtx fixsfsi_libfunc
;
474 extern rtx fixsfdi_libfunc
;
475 extern rtx fixsfti_libfunc
;
477 extern rtx fixdfsi_libfunc
;
478 extern rtx fixdfdi_libfunc
;
479 extern rtx fixdfti_libfunc
;
481 extern rtx fixxfsi_libfunc
;
482 extern rtx fixxfdi_libfunc
;
483 extern rtx fixxfti_libfunc
;
485 extern rtx fixtfsi_libfunc
;
486 extern rtx fixtfdi_libfunc
;
487 extern rtx fixtfti_libfunc
;
489 extern rtx fixunssfsi_libfunc
;
490 extern rtx fixunssfdi_libfunc
;
491 extern rtx fixunssfti_libfunc
;
493 extern rtx fixunsdfsi_libfunc
;
494 extern rtx fixunsdfdi_libfunc
;
495 extern rtx fixunsdfti_libfunc
;
497 extern rtx fixunsxfsi_libfunc
;
498 extern rtx fixunsxfdi_libfunc
;
499 extern rtx fixunsxfti_libfunc
;
501 extern rtx fixunstfsi_libfunc
;
502 extern rtx fixunstfdi_libfunc
;
503 extern rtx fixunstfti_libfunc
;
505 /* For check-memory-usage. */
506 extern rtx chkr_check_addr_libfunc
;
507 extern rtx chkr_set_right_libfunc
;
508 extern rtx chkr_copy_bitmap_libfunc
;
509 extern rtx chkr_check_exec_libfunc
;
510 extern rtx chkr_check_str_libfunc
;
512 typedef rtx (*rtxfun
) PROTO ((rtx
));
514 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
515 gives the gen_function to make a branch to test that condition. */
517 extern rtxfun bcc_gen_fctn
[NUM_RTX_CODE
];
519 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
520 gives the insn code to make a store-condition insn
521 to test that condition. */
523 extern enum insn_code setcc_gen_code
[NUM_RTX_CODE
];
525 #ifdef HAVE_conditional_move
526 /* Indexed by the the machine mode, gives the insn code to make a conditional
529 extern enum insn_code movcc_gen_code
[NUM_MACHINE_MODES
];
532 /* This array records the insn_code of insns to perform block moves. */
533 extern enum insn_code movstr_optab
[NUM_MACHINE_MODES
];
535 /* This array records the insn_code of insns to perform block clears. */
536 extern enum insn_code clrstr_optab
[NUM_MACHINE_MODES
];
538 /* Define functions given in optabs.c. */
540 /* Expand a binary operation given optab and rtx operands. */
541 extern rtx expand_binop
PROTO((enum machine_mode
, optab
, rtx
, rtx
, rtx
,
542 int, enum optab_methods
));
544 /* Expand a binary operation with both signed and unsigned forms. */
545 extern rtx sign_expand_binop
PROTO((enum machine_mode
, optab
, optab
, rtx
,
546 rtx
, rtx
, int, enum optab_methods
));
548 /* Generate code to perform an operation on two operands with two results. */
549 extern int expand_twoval_binop
PROTO((optab
, rtx
, rtx
, rtx
, rtx
, int));
551 /* Expand a unary arithmetic operation given optab rtx operand. */
552 extern rtx expand_unop
PROTO((enum machine_mode
, optab
, rtx
, rtx
, int));
554 /* Expand the absolute value operation. */
555 extern rtx expand_abs
PROTO((enum machine_mode
, rtx
, rtx
, int, int));
557 /* Expand the complex absolute value operation. */
558 extern rtx expand_complex_abs
PROTO((enum machine_mode
, rtx
, rtx
, int));
560 /* Generate an instruction with a given INSN_CODE with an output and
562 extern void emit_unop_insn
PROTO((int, rtx
, rtx
, enum rtx_code
));
564 /* Emit code to perform a series of operations on a multi-word quantity, one
566 extern rtx emit_no_conflict_block
PROTO((rtx
, rtx
, rtx
, rtx
, rtx
));
568 /* Emit code to make a call to a constant function or a library call. */
569 extern void emit_libcall_block
PROTO((rtx
, rtx
, rtx
, rtx
));
571 /* Emit one rtl instruction to store zero in specified rtx. */
572 extern void emit_clr_insn
PROTO((rtx
));
574 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0. */
575 extern void emit_0_to_1_insn
PROTO((rtx
));
577 /* Emit one rtl insn to compare two rtx's. */
578 extern void emit_cmp_insn
PROTO((rtx
, rtx
, enum rtx_code
, rtx
,
579 enum machine_mode
, int, int));
581 /* Nonzero if a compare of mode MODE can be done straightforwardly
582 (without splitting it into pieces). */
583 extern int can_compare_p
PROTO((enum machine_mode
));
585 /* Emit a library call comparison between floating point X and Y.
586 COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.). */
587 extern void emit_float_lib_cmp
PROTO((rtx
, rtx
, enum rtx_code
));
589 /* Generate code to indirectly jump to a location given in the rtx LOC. */
590 extern void emit_indirect_jump
PROTO((rtx
));
592 #ifdef HAVE_conditional_move
593 /* Emit a conditional move operation. */
594 rtx emit_conditional_move
PROTO((rtx
, enum rtx_code
, rtx
, rtx
,
595 enum machine_mode
, rtx
, rtx
,
596 enum machine_mode
, int));
598 /* Return non-zero if the conditional move is supported. */
599 int can_conditionally_move_p
PROTO((enum machine_mode mode
));
603 /* Create but don't emit one rtl instruction to add one rtx into another.
604 Modes must match; operands must meet the operation's predicates.
605 Likewise for subtraction and for just copying.
606 These do not call protect_from_queue; caller must do so. */
607 extern rtx gen_add2_insn
PROTO((rtx
, rtx
));
608 extern rtx gen_sub2_insn
PROTO((rtx
, rtx
));
609 extern rtx gen_move_insn
PROTO((rtx
, rtx
));
610 extern int have_add2_insn
PROTO((enum machine_mode
));
611 extern int have_sub2_insn
PROTO((enum machine_mode
));
613 /* Return the INSN_CODE to use for an extend operation. */
614 extern enum insn_code can_extend_p
PROTO((enum machine_mode
,
615 enum machine_mode
, int));
617 /* Generate the body of an insn to extend Y (with mode MFROM)
618 into X (with mode MTO). Do zero-extension if UNSIGNEDP is nonzero. */
619 extern rtx gen_extend_insn
PROTO((rtx
, rtx
, enum machine_mode
,
620 enum machine_mode
, int));
622 /* Initialize the tables that control conversion between fixed and
624 extern void init_fixtab
PROTO((void));
625 extern void init_floattab
PROTO((void));
627 /* Generate code for a FLOAT_EXPR. */
628 extern void expand_float
PROTO((rtx
, rtx
, int));
630 /* Generate code for a FIX_EXPR. */
631 extern void expand_fix
PROTO((rtx
, rtx
, int));
633 /* Call this once to initialize the contents of the optabs
634 appropriately for the current target machine. */
635 extern void init_optabs
PROTO((void));
637 /* Functions from expmed.c: */
639 /* Arguments MODE, RTX: return an rtx for the negation of that value.
641 extern rtx negate_rtx
PROTO((enum machine_mode
, rtx
));
643 /* Expand a logical AND operation. */
644 extern rtx expand_and
PROTO((rtx
, rtx
, rtx
));
646 /* Emit a store-flag operation. */
647 extern rtx emit_store_flag
PROTO((rtx
, enum rtx_code
, rtx
, rtx
,
648 enum machine_mode
, int, int));
650 /* Like emit_store_flag, but always succeeds. */
651 extern rtx emit_store_flag_force
PROTO((rtx
, enum rtx_code
, rtx
, rtx
,
652 enum machine_mode
, int, int));
654 /* Functions from loop.c: */
656 /* Given a JUMP_INSN, return a description of the test being made. */
657 extern rtx get_condition
PROTO((rtx
, rtx
*));
659 /* Functions from expr.c: */
661 /* This is run once per compilation to set up which modes can be used
662 directly in memory and to initialize the block move optab. */
663 extern void init_expr_once
PROTO((void));
665 /* This is run at the start of compiling a function. */
666 extern void init_expr
PROTO((void));
668 /* Use protect_from_queue to convert a QUEUED expression
669 into something that you can put immediately into an instruction. */
670 extern rtx protect_from_queue
PROTO((rtx
, int));
672 /* Perform all the pending incrementations. */
673 extern void emit_queue
PROTO((void));
675 /* Emit some rtl insns to move data between rtx's, converting machine modes.
676 Both modes must be floating or both fixed. */
677 extern void convert_move
PROTO((rtx
, rtx
, int));
679 /* Convert an rtx to specified machine mode and return the result. */
680 extern rtx convert_to_mode
PROTO((enum machine_mode
, rtx
, int));
682 /* Convert an rtx to MODE from OLDMODE and return the result. */
683 extern rtx convert_modes
PROTO((enum machine_mode
, enum machine_mode
, rtx
, int));
685 /* Emit code to move a block Y to a block X. */
686 extern rtx emit_block_move
PROTO((rtx
, rtx
, rtx
, int));
688 /* Copy all or part of a value X into registers starting at REGNO.
689 The number of registers to be filled is NREGS. */
690 extern void move_block_to_reg
PROTO((int, rtx
, int, enum machine_mode
));
692 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
693 The number of registers to be filled is NREGS. */
694 extern void move_block_from_reg
PROTO((int, rtx
, int, int));
696 /* Load a BLKmode value into non-consecutive registers represented by a
698 extern void emit_group_load
PROTO((rtx
, rtx
));
699 /* Store a BLKmode value from non-consecutive registers represented by a
701 extern void emit_group_store
PROTO((rtx
, rtx
));
703 /* Mark REG as holding a parameter for the next CALL_INSN. */
704 extern void use_reg
PROTO((rtx
*, rtx
));
705 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
706 for the next CALL_INSN. */
707 extern void use_regs
PROTO((rtx
*, int, int));
708 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
709 extern void use_group_regs
PROTO((rtx
*, rtx
));
711 /* Write zeros through the storage of OBJECT.
712 If OBJECT has BLKmode, SIZE is its length in bytes and ALIGN is its
714 extern rtx clear_storage
PROTO((rtx
, rtx
, int));
716 /* Emit insns to set X from Y. */
717 extern rtx emit_move_insn
PROTO((rtx
, rtx
));
719 /* Emit insns to set X from Y, with no frills. */
720 extern rtx emit_move_insn_1
PROTO ((rtx
, rtx
));
722 /* Push a block of length SIZE (perhaps variable)
723 and return an rtx to address the beginning of the block. */
724 extern rtx push_block
PROTO((rtx
, int, int));
726 /* Make an operand to push something on the stack. */
727 extern rtx gen_push_operand
PROTO((void));
730 /* Generate code to push something onto the stack, given its mode and type. */
731 extern void emit_push_insn
PROTO((rtx
, enum machine_mode
, tree
, rtx
, int,
732 int, rtx
, int, rtx
, rtx
));
734 /* Emit library call. */
735 extern void emit_library_call
PVPROTO((rtx orgfun
, int no_queue
,
736 enum machine_mode outmode
, int nargs
, ...));
737 extern rtx emit_library_call_value
PVPROTO((rtx orgfun
, rtx value
, int no_queue
,
738 enum machine_mode outmode
, int nargs
, ...));
740 /* Expand an assignment that stores the value of FROM into TO. */
741 extern rtx expand_assignment
PROTO((tree
, tree
, int, int));
743 /* Generate code for computing expression EXP,
744 and storing the value into TARGET.
745 If SUGGEST_REG is nonzero, copy the value through a register
746 and return that register, if that is possible. */
747 extern rtx store_expr
PROTO((tree
, rtx
, int));
750 /* Given an rtx that may include add and multiply operations,
751 generate them as insns and return a pseudo-reg containing the value.
752 Useful after calling expand_expr with 1 as sum_ok. */
753 extern rtx force_operand
PROTO((rtx
, rtx
));
755 extern rtx expand_builtin_setjmp
PROTO((rtx
, rtx
, rtx
, rtx
));
758 /* Generate code for computing expression EXP.
759 An rtx for the computed value is returned. The value is never null.
760 In the case of a void EXP, const0_rtx is returned. */
761 extern rtx expand_expr
PROTO((tree
, rtx
, enum machine_mode
,
762 enum expand_modifier
));
765 /* At the start of a function, record that we have no previously-pushed
766 arguments waiting to be popped. */
767 extern void init_pending_stack_adjust
PROTO((void));
769 /* When exiting from function, if safe, clear out any pending stack adjust
770 so the adjustment won't get done. */
771 extern void clear_pending_stack_adjust
PROTO((void));
773 /* Pop any previously-pushed arguments that have not been popped yet. */
774 extern void do_pending_stack_adjust
PROTO((void));
777 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
778 extern void jumpifnot
PROTO((tree
, rtx
));
780 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
781 extern void jumpif
PROTO((tree
, rtx
));
783 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
784 the result is zero, or IF_TRUE_LABEL if the result is one. */
785 extern void do_jump
PROTO((tree
, rtx
, rtx
));
788 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
789 extern rtx compare_from_rtx
PROTO((rtx
, rtx
, enum rtx_code
, int,
790 enum machine_mode
, rtx
, int));
792 /* Generate a tablejump instruction (used for switch statements). */
793 extern void do_tablejump
PROTO((rtx
, enum machine_mode
, rtx
, rtx
, rtx
));
796 /* rtl.h and tree.h were included. */
797 /* Return an rtx for the size in bytes of the value of an expr. */
798 extern rtx expr_size
PROTO((tree
));
800 extern rtx lookup_static_chain
PROTO((tree
));
802 /* Convert a stack slot address ADDR valid in function FNDECL
803 into an address valid in this function (using a static chain). */
804 extern rtx fix_lexical_addr
PROTO((rtx
, tree
));
806 /* Return the address of the trampoline for entering nested fn FUNCTION. */
807 extern rtx trampoline_address
PROTO((tree
));
809 /* Return an rtx that refers to the value returned by a function
810 in its original home. This becomes invalid if any more code is emitted. */
811 extern rtx hard_function_value
PROTO((tree
, tree
));
813 extern rtx prepare_call_address
PROTO((rtx
, tree
, rtx
*, int));
815 extern rtx expand_call
PROTO((tree
, rtx
, int));
817 extern rtx expand_shift
PROTO((enum tree_code
, enum machine_mode
, rtx
, tree
, rtx
, int));
818 extern rtx expand_divmod
PROTO((int, enum tree_code
, enum machine_mode
, rtx
, rtx
, rtx
, int));
819 extern void locate_and_pad_parm
PROTO((enum machine_mode
, tree
, int, tree
, struct args_size
*, struct args_size
*, struct args_size
*));
820 extern rtx expand_inline_function
PROTO((tree
, tree
, rtx
, int, tree
, rtx
));
821 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
822 extern rtx label_rtx
PROTO((tree
));
825 /* Indicate how an input argument register was promoted. */
826 extern rtx promoted_input_arg
PROTO((int, enum machine_mode
*, int *));
828 /* Return an rtx like arg but sans any constant terms.
829 Returns the original rtx if it has no constant terms.
830 The constant terms are added and stored via a second arg. */
831 extern rtx eliminate_constant_term
PROTO((rtx
, rtx
*));
833 /* Convert arg to a valid memory address for specified machine mode,
834 by emitting insns to perform arithmetic if nec. */
835 extern rtx memory_address
PROTO((enum machine_mode
, rtx
));
837 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
838 extern rtx memory_address_noforce
PROTO((enum machine_mode
, rtx
));
840 /* Return a memory reference like MEMREF, but with its mode changed
841 to MODE and its address changed to ADDR.
842 (VOIDmode means don't change the mode.
843 NULL for ADDR means don't change the address.) */
844 extern rtx change_address
PROTO((rtx
, enum machine_mode
, rtx
));
846 /* Return a memory reference like MEMREF, but which is known to have a
849 extern rtx validize_mem
PROTO((rtx
));
851 /* Assemble the static constant template for function entry trampolines. */
852 extern rtx assemble_trampoline_template
PROTO((void));
854 /* Return 1 if two rtx's are equivalent in structure and elements. */
855 extern int rtx_equal_p
PROTO((rtx
, rtx
));
857 /* Given rtx, return new rtx whose address won't be affected by
858 any side effects. It has been copied to a new temporary reg. */
859 extern rtx stabilize
PROTO((rtx
));
861 /* Given an rtx, copy all regs it refers to into new temps
862 and return a modified copy that refers to the new temps. */
863 extern rtx copy_all_regs
PROTO((rtx
));
865 /* Copy given rtx to a new temp reg and return that. */
866 extern rtx copy_to_reg
PROTO((rtx
));
868 /* Like copy_to_reg but always make the reg Pmode. */
869 extern rtx copy_addr_to_reg
PROTO((rtx
));
871 /* Like copy_to_reg but always make the reg the specified mode MODE. */
872 extern rtx copy_to_mode_reg
PROTO((enum machine_mode
, rtx
));
874 /* Copy given rtx to given temp reg and return that. */
875 extern rtx copy_to_suggested_reg
PROTO((rtx
, rtx
, enum machine_mode
));
877 /* Copy a value to a register if it isn't already a register.
878 Args are mode (in case value is a constant) and the value. */
879 extern rtx force_reg
PROTO((enum machine_mode
, rtx
));
881 /* Return given rtx, copied into a new temp reg if it was in memory. */
882 extern rtx force_not_mem
PROTO((rtx
));
885 /* Return mode and signedness to use when object is promoted. */
886 extern enum machine_mode promote_mode
PROTO((tree
, enum machine_mode
,
890 /* Remove some bytes from the stack. An rtx says how many. */
891 extern void adjust_stack
PROTO((rtx
));
893 /* Add some bytes to the stack. An rtx says how many. */
894 extern void anti_adjust_stack
PROTO((rtx
));
896 /* This enum is used for the following two functions. */
897 enum save_level
{SAVE_BLOCK
, SAVE_FUNCTION
, SAVE_NONLOCAL
};
899 /* Save the stack pointer at the specified level. */
900 extern void emit_stack_save
PROTO((enum save_level
, rtx
*, rtx
));
902 /* Restore the stack pointer from a save area of the specified level. */
903 extern void emit_stack_restore
PROTO((enum save_level
, rtx
, rtx
));
905 /* Allocate some space on the stack dynamically and return its address. An rtx
906 says how many bytes. */
907 extern rtx allocate_dynamic_stack_space
PROTO((rtx
, rtx
, int));
909 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
910 FIRST is a constant and size is a Pmode RTX. These are offsets from the
911 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
912 subtract from the stack. If SIZE is constant, this is done
913 with a fixed number of probes. Otherwise, we must make a loop. */
914 extern void probe_stack_range
PROTO((HOST_WIDE_INT
, rtx
));
916 /* Return an rtx that refers to the value returned by a library call
917 in its original home. This becomes invalid if any more code is emitted. */
918 extern rtx hard_libcall_value
PROTO((enum machine_mode
));
920 /* Given an rtx, return an rtx for a value rounded up to a multiple
921 of STACK_BOUNDARY / BITS_PER_UNIT. */
922 extern rtx round_push
PROTO((rtx
));
924 extern rtx store_bit_field
PROTO((rtx
, int, int, enum machine_mode
, rtx
, int, int));
925 extern rtx extract_bit_field
PROTO((rtx
, int, int, int, rtx
, enum machine_mode
, enum machine_mode
, int, int));
926 extern rtx expand_mult
PROTO((enum machine_mode
, rtx
, rtx
, rtx
, int));
927 extern rtx expand_mult_add
PROTO((rtx
, rtx
, rtx
, rtx
,enum machine_mode
, int));
928 extern rtx expand_mult_highpart_adjust
PROTO((enum machine_mode
, rtx
, rtx
, rtx
, rtx
, int));
930 extern rtx assemble_static_space
PROTO((int));
932 /* Hook called by expand_expr for language-specific tree codes.
933 It is up to the language front end to install a hook
934 if it has any such codes that expand_expr needs to know about. */
935 extern rtx (*lang_expand_expr
) PROTO ((union tree_node
*, rtx
,
937 enum expand_modifier modifier
));
939 extern void init_all_optabs
PROTO ((void));
940 extern void init_mov_optab
PROTO ((void));
941 extern void do_jump_by_parts_greater_rtx
PROTO ((enum machine_mode
, int,
942 rtx
, rtx
, rtx
, rtx
));