1 /* Definitions for code generation pass of GNU compiler.
2 Copyright (C) 1987, 91-97, 1998 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 /* Current level for normal temporaries. */
137 extern int temp_slot_level
;
139 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
140 /* Structure to record the size of a sequence of arguments
141 as the sum of a tree-expression and a constant. */
145 HOST_WIDE_INT constant
;
150 /* Add the value of the tree INC to the `struct args_size' TO. */
152 #define ADD_PARM_SIZE(TO, INC) \
153 { tree inc = (INC); \
154 if (TREE_CODE (inc) == INTEGER_CST) \
155 (TO).constant += TREE_INT_CST_LOW (inc); \
156 else if ((TO).var == 0) \
159 (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
161 #define SUB_PARM_SIZE(TO, DEC) \
162 { tree dec = (DEC); \
163 if (TREE_CODE (dec) == INTEGER_CST) \
164 (TO).constant -= TREE_INT_CST_LOW (dec); \
165 else if ((TO).var == 0) \
166 (TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
168 (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
170 /* Convert the implicit sum in a `struct args_size' into an rtx. */
171 #define ARGS_SIZE_RTX(SIZE) \
172 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
173 : expand_expr (size_binop (PLUS_EXPR, (SIZE).var, \
174 size_int ((SIZE).constant)), \
175 NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD))
177 /* Convert the implicit sum in a `struct args_size' into a tree. */
178 #define ARGS_SIZE_TREE(SIZE) \
179 ((SIZE).var == 0 ? size_int ((SIZE).constant) \
180 : size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
182 /* Supply a default definition for FUNCTION_ARG_PADDING:
183 usually pad upward, but pad short args downward on
184 big-endian machines. */
186 enum direction
{none
, upward
, downward
}; /* Value has this type. */
188 #ifndef FUNCTION_ARG_PADDING
189 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
190 (! BYTES_BIG_ENDIAN \
192 : (((MODE) == BLKmode \
193 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
194 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
195 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
196 ? downward : upward))
199 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
200 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
203 #ifndef FUNCTION_ARG_BOUNDARY
204 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
207 /* Provide a default value for STRICT_ARGUMENT_NAMING. */
208 #ifndef STRICT_ARGUMENT_NAMING
209 #define STRICT_ARGUMENT_NAMING 0
212 /* Nonzero if we do not know how to pass TYPE solely in registers.
213 We cannot do so in the following cases:
215 - if the type has variable size
216 - if the type is marked as addressable (it is required to be constructed
218 - if the padding and mode of the type is such that a copy into a register
219 would put it into the wrong part of the register.
221 Which padding can't be supported depends on the byte endianness.
223 A value in a register is implicitly padded at the most significant end.
224 On a big-endian machine, that is the lower end in memory.
225 So a value padded in memory at the upper end can't go in a register.
226 For a little-endian machine, the reverse is true. */
228 #ifndef MUST_PASS_IN_STACK
229 #define MUST_PASS_IN_STACK(MODE,TYPE) \
231 && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
232 || TREE_ADDRESSABLE (TYPE) \
233 || ((MODE) == BLKmode \
234 && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
235 && 0 == (int_size_in_bytes (TYPE) \
236 % (PARM_BOUNDARY / BITS_PER_UNIT))) \
237 && (FUNCTION_ARG_PADDING (MODE, TYPE) \
238 == (BYTES_BIG_ENDIAN ? upward : downward)))))
241 /* Nonzero if type TYPE should be returned in memory.
242 Most machines can use the following default definition. */
244 #ifndef RETURN_IN_MEMORY
245 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
248 /* Provide default values for the macros controlling stack checking. */
250 #ifndef STACK_CHECK_BUILTIN
251 #define STACK_CHECK_BUILTIN 0
254 /* The default interval is one page. */
255 #ifndef STACK_CHECK_PROBE_INTERVAL
256 #define STACK_CHECK_PROBE_INTERVAL 4096
259 /* The default is to do a store into the stack. */
260 #ifndef STACK_CHECK_PROBE_LOAD
261 #define STACK_CHECK_PROBE_LOAD 0
264 /* This value is arbitrary, but should be sufficient for most machines. */
265 #ifndef STACK_CHECK_PROTECT
266 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
269 /* Make the maximum frame size be the largest we can and still only need
270 one probe per function. */
271 #ifndef STACK_CHECK_MAX_FRAME_SIZE
272 #define STACK_CHECK_MAX_FRAME_SIZE \
273 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
276 /* This is arbitrary, but should be large enough everywhere. */
277 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
278 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
281 /* Provide a reasonable default for the maximum size of an object to
282 allocate in the fixed frame. We may need to be able to make this
283 controllable by the user at some point. */
284 #ifndef STACK_CHECK_MAX_VAR_SIZE
285 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
288 /* Optabs are tables saying how to generate insn bodies
289 for various machine modes and numbers of operands.
290 Each optab applies to one operation.
291 For example, add_optab applies to addition.
293 The insn_code slot is the enum insn_code that says how to
294 generate an insn for this operation on a particular machine mode.
295 It is CODE_FOR_nothing if there is no such insn on the target machine.
297 The `lib_call' slot is the name of the library function that
298 can be used to perform the operation.
300 A few optabs, such as move_optab and cmp_optab, are used
303 /* Everything that uses expr.h needs to define enum insn_code
304 but we don't list it in the Makefile dependencies just for that. */
305 #include "insn-codes.h"
311 enum insn_code insn_code
;
313 } handlers
[NUM_MACHINE_MODES
];
316 /* Given an enum insn_code, access the function to construct
317 the body of that kind of insn. */
318 #ifdef FUNCTION_CONVERSION_BUG
319 /* Some compilers fail to convert a function properly to a
320 pointer-to-function when used as an argument.
321 So produce the pointer-to-function directly.
322 Luckily, these compilers seem to work properly when you
323 call the pointer-to-function. */
324 #define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
326 #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
329 extern rtx (*const insn_gen_function
[]) PROTO ((rtx
, ...));
331 extern optab add_optab
;
332 extern optab sub_optab
;
333 extern optab smul_optab
; /* Signed and floating-point multiply */
334 extern optab smul_highpart_optab
; /* Signed multiply, return high word */
335 extern optab umul_highpart_optab
;
336 extern optab smul_widen_optab
; /* Signed multiply with result
337 one machine mode wider than args */
338 extern optab umul_widen_optab
;
339 extern optab sdiv_optab
; /* Signed divide */
340 extern optab sdivmod_optab
; /* Signed divide-and-remainder in one */
341 extern optab udiv_optab
;
342 extern optab udivmod_optab
;
343 extern optab smod_optab
; /* Signed remainder */
344 extern optab umod_optab
;
345 extern optab flodiv_optab
; /* Optab for floating divide. */
346 extern optab ftrunc_optab
; /* Convert float to integer in float fmt */
347 extern optab and_optab
; /* Logical and */
348 extern optab ior_optab
; /* Logical or */
349 extern optab xor_optab
; /* Logical xor */
350 extern optab ashl_optab
; /* Arithmetic shift left */
351 extern optab ashr_optab
; /* Arithmetic shift right */
352 extern optab lshr_optab
; /* Logical shift right */
353 extern optab rotl_optab
; /* Rotate left */
354 extern optab rotr_optab
; /* Rotate right */
355 extern optab smin_optab
; /* Signed and floating-point minimum value */
356 extern optab smax_optab
; /* Signed and floating-point maximum value */
357 extern optab umin_optab
; /* Unsigned minimum value */
358 extern optab umax_optab
; /* Unsigned maximum value */
360 extern optab mov_optab
; /* Move instruction. */
361 extern optab movstrict_optab
; /* Move, preserving high part of register. */
363 extern optab cmp_optab
; /* Compare insn; two operands. */
364 extern optab tst_optab
; /* tst insn; compare one operand against 0 */
366 /* Unary operations */
367 extern optab neg_optab
; /* Negation */
368 extern optab abs_optab
; /* Abs value */
369 extern optab one_cmpl_optab
; /* Bitwise not */
370 extern optab ffs_optab
; /* Find first bit set */
371 extern optab sqrt_optab
; /* Square root */
372 extern optab sin_optab
; /* Sine */
373 extern optab cos_optab
; /* Cosine */
374 extern optab strlen_optab
; /* String length */
376 /* Tables of patterns for extending one integer mode to another. */
377 extern enum insn_code extendtab
[MAX_MACHINE_MODE
][MAX_MACHINE_MODE
][2];
379 /* Tables of patterns for converting between fixed and floating point. */
380 extern enum insn_code fixtab
[NUM_MACHINE_MODES
][NUM_MACHINE_MODES
][2];
381 extern enum insn_code fixtrunctab
[NUM_MACHINE_MODES
][NUM_MACHINE_MODES
][2];
382 extern enum insn_code floattab
[NUM_MACHINE_MODES
][NUM_MACHINE_MODES
][2];
384 /* Contains the optab used for each rtx code. */
385 extern optab code_to_optab
[NUM_RTX_CODE
+ 1];
387 /* Passed to expand_binop and expand_unop to say which options to try to use
388 if the requested operation can't be open-coded on the requisite mode.
389 Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
390 Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
391 OPTAB_MUST_WIDEN says try widening and don't try anything else. */
402 /* SYMBOL_REF rtx's for the library functions that are called
403 implicitly and not via optabs. */
405 extern rtx extendsfdf2_libfunc
;
406 extern rtx extendsfxf2_libfunc
;
407 extern rtx extendsftf2_libfunc
;
408 extern rtx extenddfxf2_libfunc
;
409 extern rtx extenddftf2_libfunc
;
411 extern rtx truncdfsf2_libfunc
;
412 extern rtx truncxfsf2_libfunc
;
413 extern rtx trunctfsf2_libfunc
;
414 extern rtx truncxfdf2_libfunc
;
415 extern rtx trunctfdf2_libfunc
;
417 extern rtx memcpy_libfunc
;
418 extern rtx bcopy_libfunc
;
419 extern rtx memcmp_libfunc
;
420 extern rtx bcmp_libfunc
;
421 extern rtx memset_libfunc
;
422 extern rtx bzero_libfunc
;
424 extern rtx throw_libfunc
;
425 extern rtx sjthrow_libfunc
;
426 extern rtx sjpopnthrow_libfunc
;
427 extern rtx terminate_libfunc
;
428 extern rtx setjmp_libfunc
;
429 extern rtx longjmp_libfunc
;
431 extern rtx eqhf2_libfunc
;
432 extern rtx nehf2_libfunc
;
433 extern rtx gthf2_libfunc
;
434 extern rtx gehf2_libfunc
;
435 extern rtx lthf2_libfunc
;
436 extern rtx lehf2_libfunc
;
438 extern rtx eqsf2_libfunc
;
439 extern rtx nesf2_libfunc
;
440 extern rtx gtsf2_libfunc
;
441 extern rtx gesf2_libfunc
;
442 extern rtx ltsf2_libfunc
;
443 extern rtx lesf2_libfunc
;
445 extern rtx eqdf2_libfunc
;
446 extern rtx nedf2_libfunc
;
447 extern rtx gtdf2_libfunc
;
448 extern rtx gedf2_libfunc
;
449 extern rtx ltdf2_libfunc
;
450 extern rtx ledf2_libfunc
;
452 extern rtx eqxf2_libfunc
;
453 extern rtx nexf2_libfunc
;
454 extern rtx gtxf2_libfunc
;
455 extern rtx gexf2_libfunc
;
456 extern rtx ltxf2_libfunc
;
457 extern rtx lexf2_libfunc
;
459 extern rtx eqtf2_libfunc
;
460 extern rtx netf2_libfunc
;
461 extern rtx gttf2_libfunc
;
462 extern rtx getf2_libfunc
;
463 extern rtx lttf2_libfunc
;
464 extern rtx letf2_libfunc
;
466 extern rtx floatsisf_libfunc
;
467 extern rtx floatdisf_libfunc
;
468 extern rtx floattisf_libfunc
;
470 extern rtx floatsidf_libfunc
;
471 extern rtx floatdidf_libfunc
;
472 extern rtx floattidf_libfunc
;
474 extern rtx floatsixf_libfunc
;
475 extern rtx floatdixf_libfunc
;
476 extern rtx floattixf_libfunc
;
478 extern rtx floatsitf_libfunc
;
479 extern rtx floatditf_libfunc
;
480 extern rtx floattitf_libfunc
;
482 extern rtx fixsfsi_libfunc
;
483 extern rtx fixsfdi_libfunc
;
484 extern rtx fixsfti_libfunc
;
486 extern rtx fixdfsi_libfunc
;
487 extern rtx fixdfdi_libfunc
;
488 extern rtx fixdfti_libfunc
;
490 extern rtx fixxfsi_libfunc
;
491 extern rtx fixxfdi_libfunc
;
492 extern rtx fixxfti_libfunc
;
494 extern rtx fixtfsi_libfunc
;
495 extern rtx fixtfdi_libfunc
;
496 extern rtx fixtfti_libfunc
;
498 extern rtx fixunssfsi_libfunc
;
499 extern rtx fixunssfdi_libfunc
;
500 extern rtx fixunssfti_libfunc
;
502 extern rtx fixunsdfsi_libfunc
;
503 extern rtx fixunsdfdi_libfunc
;
504 extern rtx fixunsdfti_libfunc
;
506 extern rtx fixunsxfsi_libfunc
;
507 extern rtx fixunsxfdi_libfunc
;
508 extern rtx fixunsxfti_libfunc
;
510 extern rtx fixunstfsi_libfunc
;
511 extern rtx fixunstfdi_libfunc
;
512 extern rtx fixunstfti_libfunc
;
514 /* For check-memory-usage. */
515 extern rtx chkr_check_addr_libfunc
;
516 extern rtx chkr_set_right_libfunc
;
517 extern rtx chkr_copy_bitmap_libfunc
;
518 extern rtx chkr_check_exec_libfunc
;
519 extern rtx chkr_check_str_libfunc
;
521 typedef rtx (*rtxfun
) PROTO ((rtx
));
523 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
524 gives the gen_function to make a branch to test that condition. */
526 extern rtxfun bcc_gen_fctn
[NUM_RTX_CODE
];
528 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
529 gives the insn code to make a store-condition insn
530 to test that condition. */
532 extern enum insn_code setcc_gen_code
[NUM_RTX_CODE
];
534 #ifdef HAVE_conditional_move
535 /* Indexed by the the machine mode, gives the insn code to make a conditional
538 extern enum insn_code movcc_gen_code
[NUM_MACHINE_MODES
];
541 /* This array records the insn_code of insns to perform block moves. */
542 extern enum insn_code movstr_optab
[NUM_MACHINE_MODES
];
544 /* This array records the insn_code of insns to perform block clears. */
545 extern enum insn_code clrstr_optab
[NUM_MACHINE_MODES
];
547 /* Define functions given in optabs.c. */
549 /* Expand a binary operation given optab and rtx operands. */
550 extern rtx expand_binop
PROTO((enum machine_mode
, optab
, rtx
, rtx
, rtx
,
551 int, enum optab_methods
));
553 /* Expand a binary operation with both signed and unsigned forms. */
554 extern rtx sign_expand_binop
PROTO((enum machine_mode
, optab
, optab
, rtx
,
555 rtx
, rtx
, int, enum optab_methods
));
557 /* Generate code to perform an operation on two operands with two results. */
558 extern int expand_twoval_binop
PROTO((optab
, rtx
, rtx
, rtx
, rtx
, int));
560 /* Expand a unary arithmetic operation given optab rtx operand. */
561 extern rtx expand_unop
PROTO((enum machine_mode
, optab
, rtx
, rtx
, int));
563 /* Expand the absolute value operation. */
564 extern rtx expand_abs
PROTO((enum machine_mode
, rtx
, rtx
, int, int));
566 /* Expand the complex absolute value operation. */
567 extern rtx expand_complex_abs
PROTO((enum machine_mode
, rtx
, rtx
, int));
569 /* Generate an instruction with a given INSN_CODE with an output and
571 extern void emit_unop_insn
PROTO((int, rtx
, rtx
, enum rtx_code
));
573 /* Emit code to perform a series of operations on a multi-word quantity, one
575 extern rtx emit_no_conflict_block
PROTO((rtx
, rtx
, rtx
, rtx
, rtx
));
577 /* Emit code to make a call to a constant function or a library call. */
578 extern void emit_libcall_block
PROTO((rtx
, rtx
, rtx
, rtx
));
580 /* Emit one rtl instruction to store zero in specified rtx. */
581 extern void emit_clr_insn
PROTO((rtx
));
583 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0. */
584 extern void emit_0_to_1_insn
PROTO((rtx
));
586 /* Emit one rtl insn to compare two rtx's. */
587 extern void emit_cmp_insn
PROTO((rtx
, rtx
, enum rtx_code
, rtx
,
588 enum machine_mode
, int, int));
590 /* Nonzero if a compare of mode MODE can be done straightforwardly
591 (without splitting it into pieces). */
592 extern int can_compare_p
PROTO((enum machine_mode
));
594 /* Emit a library call comparison between floating point X and Y.
595 COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.). */
596 extern void emit_float_lib_cmp
PROTO((rtx
, rtx
, enum rtx_code
));
598 /* Generate code to indirectly jump to a location given in the rtx LOC. */
599 extern void emit_indirect_jump
PROTO((rtx
));
601 #ifdef HAVE_conditional_move
602 /* Emit a conditional move operation. */
603 rtx emit_conditional_move
PROTO((rtx
, enum rtx_code
, rtx
, rtx
,
604 enum machine_mode
, rtx
, rtx
,
605 enum machine_mode
, int));
607 /* Return non-zero if the conditional move is supported. */
608 int can_conditionally_move_p
PROTO((enum machine_mode mode
));
612 /* Create but don't emit one rtl instruction to add one rtx into another.
613 Modes must match; operands must meet the operation's predicates.
614 Likewise for subtraction and for just copying.
615 These do not call protect_from_queue; caller must do so. */
616 extern rtx gen_add2_insn
PROTO((rtx
, rtx
));
617 extern rtx gen_sub2_insn
PROTO((rtx
, rtx
));
618 extern rtx gen_move_insn
PROTO((rtx
, rtx
));
619 extern int have_add2_insn
PROTO((enum machine_mode
));
620 extern int have_sub2_insn
PROTO((enum machine_mode
));
622 /* Return the INSN_CODE to use for an extend operation. */
623 extern enum insn_code can_extend_p
PROTO((enum machine_mode
,
624 enum machine_mode
, int));
626 /* Generate the body of an insn to extend Y (with mode MFROM)
627 into X (with mode MTO). Do zero-extension if UNSIGNEDP is nonzero. */
628 extern rtx gen_extend_insn
PROTO((rtx
, rtx
, enum machine_mode
,
629 enum machine_mode
, int));
631 /* Initialize the tables that control conversion between fixed and
633 extern void init_fixtab
PROTO((void));
634 extern void init_floattab
PROTO((void));
636 /* Generate code for a FLOAT_EXPR. */
637 extern void expand_float
PROTO((rtx
, rtx
, int));
639 /* Generate code for a FIX_EXPR. */
640 extern void expand_fix
PROTO((rtx
, rtx
, int));
642 /* Call this once to initialize the contents of the optabs
643 appropriately for the current target machine. */
644 extern void init_optabs
PROTO((void));
646 /* Functions from expmed.c: */
648 /* Arguments MODE, RTX: return an rtx for the negation of that value.
650 extern rtx negate_rtx
PROTO((enum machine_mode
, rtx
));
652 /* Expand a logical AND operation. */
653 extern rtx expand_and
PROTO((rtx
, rtx
, rtx
));
655 /* Emit a store-flag operation. */
656 extern rtx emit_store_flag
PROTO((rtx
, enum rtx_code
, rtx
, rtx
,
657 enum machine_mode
, int, int));
659 /* Like emit_store_flag, but always succeeds. */
660 extern rtx emit_store_flag_force
PROTO((rtx
, enum rtx_code
, rtx
, rtx
,
661 enum machine_mode
, int, int));
663 /* Functions from loop.c: */
665 /* Given a JUMP_INSN, return a description of the test being made. */
666 extern rtx get_condition
PROTO((rtx
, rtx
*));
668 /* Functions from expr.c: */
670 /* This is run once per compilation to set up which modes can be used
671 directly in memory and to initialize the block move optab. */
672 extern void init_expr_once
PROTO((void));
674 /* This is run at the start of compiling a function. */
675 extern void init_expr
PROTO((void));
677 /* Use protect_from_queue to convert a QUEUED expression
678 into something that you can put immediately into an instruction. */
679 extern rtx protect_from_queue
PROTO((rtx
, int));
681 /* Perform all the pending incrementations. */
682 extern void emit_queue
PROTO((void));
684 /* Emit some rtl insns to move data between rtx's, converting machine modes.
685 Both modes must be floating or both fixed. */
686 extern void convert_move
PROTO((rtx
, rtx
, int));
688 /* Convert an rtx to specified machine mode and return the result. */
689 extern rtx convert_to_mode
PROTO((enum machine_mode
, rtx
, int));
691 /* Convert an rtx to MODE from OLDMODE and return the result. */
692 extern rtx convert_modes
PROTO((enum machine_mode
, enum machine_mode
, rtx
, int));
694 /* Emit code to move a block Y to a block X. */
695 extern rtx emit_block_move
PROTO((rtx
, rtx
, rtx
, int));
697 /* Copy all or part of a value X into registers starting at REGNO.
698 The number of registers to be filled is NREGS. */
699 extern void move_block_to_reg
PROTO((int, rtx
, int, enum machine_mode
));
701 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
702 The number of registers to be filled is NREGS. */
703 extern void move_block_from_reg
PROTO((int, rtx
, int, int));
705 /* Load a BLKmode value into non-consecutive registers represented by a
707 extern void emit_group_load
PROTO((rtx
, rtx
));
708 /* Store a BLKmode value from non-consecutive registers represented by a
710 extern void emit_group_store
PROTO((rtx
, rtx
));
712 /* Mark REG as holding a parameter for the next CALL_INSN. */
713 extern void use_reg
PROTO((rtx
*, rtx
));
714 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
715 for the next CALL_INSN. */
716 extern void use_regs
PROTO((rtx
*, int, int));
717 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
718 extern void use_group_regs
PROTO((rtx
*, rtx
));
720 /* Write zeros through the storage of OBJECT.
721 If OBJECT has BLKmode, SIZE is its length in bytes and ALIGN is its
723 extern rtx clear_storage
PROTO((rtx
, rtx
, int));
725 /* Emit insns to set X from Y. */
726 extern rtx emit_move_insn
PROTO((rtx
, rtx
));
728 /* Emit insns to set X from Y, with no frills. */
729 extern rtx emit_move_insn_1
PROTO ((rtx
, rtx
));
731 /* Push a block of length SIZE (perhaps variable)
732 and return an rtx to address the beginning of the block. */
733 extern rtx push_block
PROTO((rtx
, int, int));
735 /* Make an operand to push something on the stack. */
736 extern rtx gen_push_operand
PROTO((void));
739 /* Generate code to push something onto the stack, given its mode and type. */
740 extern void emit_push_insn
PROTO((rtx
, enum machine_mode
, tree
, rtx
, int,
741 int, rtx
, int, rtx
, rtx
, int));
743 /* Emit library call. */
744 extern void emit_library_call
PVPROTO((rtx orgfun
, int no_queue
,
745 enum machine_mode outmode
, int nargs
, ...));
746 extern rtx emit_library_call_value
PVPROTO((rtx orgfun
, rtx value
, int no_queue
,
747 enum machine_mode outmode
, int nargs
, ...));
749 /* Expand an assignment that stores the value of FROM into TO. */
750 extern rtx expand_assignment
PROTO((tree
, tree
, int, int));
752 /* Generate code for computing expression EXP,
753 and storing the value into TARGET.
754 If SUGGEST_REG is nonzero, copy the value through a register
755 and return that register, if that is possible. */
756 extern rtx store_expr
PROTO((tree
, rtx
, int));
759 /* Given an rtx that may include add and multiply operations,
760 generate them as insns and return a pseudo-reg containing the value.
761 Useful after calling expand_expr with 1 as sum_ok. */
762 extern rtx force_operand
PROTO((rtx
, rtx
));
764 extern rtx expand_builtin_setjmp
PROTO((rtx
, rtx
, rtx
, rtx
));
767 /* Generate code for computing expression EXP.
768 An rtx for the computed value is returned. The value is never null.
769 In the case of a void EXP, const0_rtx is returned. */
770 extern rtx expand_expr
PROTO((tree
, rtx
, enum machine_mode
,
771 enum expand_modifier
));
774 /* At the start of a function, record that we have no previously-pushed
775 arguments waiting to be popped. */
776 extern void init_pending_stack_adjust
PROTO((void));
778 /* When exiting from function, if safe, clear out any pending stack adjust
779 so the adjustment won't get done. */
780 extern void clear_pending_stack_adjust
PROTO((void));
782 /* Pop any previously-pushed arguments that have not been popped yet. */
783 extern void do_pending_stack_adjust
PROTO((void));
786 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
787 extern void jumpifnot
PROTO((tree
, rtx
));
789 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
790 extern void jumpif
PROTO((tree
, rtx
));
792 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
793 the result is zero, or IF_TRUE_LABEL if the result is one. */
794 extern void do_jump
PROTO((tree
, rtx
, rtx
));
797 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
798 extern rtx compare_from_rtx
PROTO((rtx
, rtx
, enum rtx_code
, int,
799 enum machine_mode
, rtx
, int));
801 /* Generate a tablejump instruction (used for switch statements). */
802 extern void do_tablejump
PROTO((rtx
, enum machine_mode
, rtx
, rtx
, rtx
));
805 /* rtl.h and tree.h were included. */
806 /* Return an rtx for the size in bytes of the value of an expr. */
807 extern rtx expr_size
PROTO((tree
));
809 extern rtx lookup_static_chain
PROTO((tree
));
811 /* Convert a stack slot address ADDR valid in function FNDECL
812 into an address valid in this function (using a static chain). */
813 extern rtx fix_lexical_addr
PROTO((rtx
, tree
));
815 /* Return the address of the trampoline for entering nested fn FUNCTION. */
816 extern rtx trampoline_address
PROTO((tree
));
818 /* Return an rtx that refers to the value returned by a function
819 in its original home. This becomes invalid if any more code is emitted. */
820 extern rtx hard_function_value
PROTO((tree
, tree
));
822 extern rtx prepare_call_address
PROTO((rtx
, tree
, rtx
*, int));
824 extern rtx expand_call
PROTO((tree
, rtx
, int));
826 extern rtx expand_shift
PROTO((enum tree_code
, enum machine_mode
, rtx
, tree
, rtx
, int));
827 extern rtx expand_divmod
PROTO((int, enum tree_code
, enum machine_mode
, rtx
, rtx
, rtx
, int));
828 extern void locate_and_pad_parm
PROTO((enum machine_mode
, tree
, int, tree
, struct args_size
*, struct args_size
*, struct args_size
*));
829 extern rtx expand_inline_function
PROTO((tree
, tree
, rtx
, int, tree
, rtx
));
830 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
831 extern rtx label_rtx
PROTO((tree
));
834 /* Indicate how an input argument register was promoted. */
835 extern rtx promoted_input_arg
PROTO((int, enum machine_mode
*, int *));
837 /* Return an rtx like arg but sans any constant terms.
838 Returns the original rtx if it has no constant terms.
839 The constant terms are added and stored via a second arg. */
840 extern rtx eliminate_constant_term
PROTO((rtx
, rtx
*));
842 /* Convert arg to a valid memory address for specified machine mode,
843 by emitting insns to perform arithmetic if nec. */
844 extern rtx memory_address
PROTO((enum machine_mode
, rtx
));
846 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
847 extern rtx memory_address_noforce
PROTO((enum machine_mode
, rtx
));
849 /* Return a memory reference like MEMREF, but with its mode changed
850 to MODE and its address changed to ADDR.
851 (VOIDmode means don't change the mode.
852 NULL for ADDR means don't change the address.) */
853 extern rtx change_address
PROTO((rtx
, enum machine_mode
, rtx
));
855 /* Return a memory reference like MEMREF, but which is known to have a
858 extern rtx validize_mem
PROTO((rtx
));
860 /* Assemble the static constant template for function entry trampolines. */
861 extern rtx assemble_trampoline_template
PROTO((void));
863 /* Return 1 if two rtx's are equivalent in structure and elements. */
864 extern int rtx_equal_p
PROTO((rtx
, rtx
));
866 /* Given rtx, return new rtx whose address won't be affected by
867 any side effects. It has been copied to a new temporary reg. */
868 extern rtx stabilize
PROTO((rtx
));
870 /* Given an rtx, copy all regs it refers to into new temps
871 and return a modified copy that refers to the new temps. */
872 extern rtx copy_all_regs
PROTO((rtx
));
874 /* Copy given rtx to a new temp reg and return that. */
875 extern rtx copy_to_reg
PROTO((rtx
));
877 /* Like copy_to_reg but always make the reg Pmode. */
878 extern rtx copy_addr_to_reg
PROTO((rtx
));
880 /* Like copy_to_reg but always make the reg the specified mode MODE. */
881 extern rtx copy_to_mode_reg
PROTO((enum machine_mode
, rtx
));
883 /* Copy given rtx to given temp reg and return that. */
884 extern rtx copy_to_suggested_reg
PROTO((rtx
, rtx
, enum machine_mode
));
886 /* Copy a value to a register if it isn't already a register.
887 Args are mode (in case value is a constant) and the value. */
888 extern rtx force_reg
PROTO((enum machine_mode
, rtx
));
890 /* Return given rtx, copied into a new temp reg if it was in memory. */
891 extern rtx force_not_mem
PROTO((rtx
));
894 /* Return mode and signedness to use when object is promoted. */
895 extern enum machine_mode promote_mode
PROTO((tree
, enum machine_mode
,
899 /* Remove some bytes from the stack. An rtx says how many. */
900 extern void adjust_stack
PROTO((rtx
));
902 /* Add some bytes to the stack. An rtx says how many. */
903 extern void anti_adjust_stack
PROTO((rtx
));
905 /* This enum is used for the following two functions. */
906 enum save_level
{SAVE_BLOCK
, SAVE_FUNCTION
, SAVE_NONLOCAL
};
908 /* Save the stack pointer at the specified level. */
909 extern void emit_stack_save
PROTO((enum save_level
, rtx
*, rtx
));
911 /* Restore the stack pointer from a save area of the specified level. */
912 extern void emit_stack_restore
PROTO((enum save_level
, rtx
, rtx
));
914 /* Allocate some space on the stack dynamically and return its address. An rtx
915 says how many bytes. */
916 extern rtx allocate_dynamic_stack_space
PROTO((rtx
, rtx
, int));
918 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
919 FIRST is a constant and size is a Pmode RTX. These are offsets from the
920 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
921 subtract from the stack. If SIZE is constant, this is done
922 with a fixed number of probes. Otherwise, we must make a loop. */
923 extern void probe_stack_range
PROTO((HOST_WIDE_INT
, rtx
));
925 /* Return an rtx that refers to the value returned by a library call
926 in its original home. This becomes invalid if any more code is emitted. */
927 extern rtx hard_libcall_value
PROTO((enum machine_mode
));
929 /* Given an rtx, return an rtx for a value rounded up to a multiple
930 of STACK_BOUNDARY / BITS_PER_UNIT. */
931 extern rtx round_push
PROTO((rtx
));
933 extern rtx store_bit_field
PROTO((rtx
, int, int, enum machine_mode
, rtx
, int, int));
934 extern rtx extract_bit_field
PROTO((rtx
, int, int, int, rtx
, enum machine_mode
, enum machine_mode
, int, int));
935 extern rtx expand_mult
PROTO((enum machine_mode
, rtx
, rtx
, rtx
, int));
936 extern rtx expand_mult_add
PROTO((rtx
, rtx
, rtx
, rtx
,enum machine_mode
, int));
937 extern rtx expand_mult_highpart_adjust
PROTO((enum machine_mode
, rtx
, rtx
, rtx
, rtx
, int));
939 extern rtx assemble_static_space
PROTO((int));
941 /* Hook called by expand_expr for language-specific tree codes.
942 It is up to the language front end to install a hook
943 if it has any such codes that expand_expr needs to know about. */
944 extern rtx (*lang_expand_expr
) PROTO ((union tree_node
*, rtx
,
946 enum expand_modifier modifier
));
948 extern void init_all_optabs
PROTO ((void));
949 extern void init_mov_optab
PROTO ((void));
950 extern void do_jump_by_parts_greater_rtx
PROTO ((enum machine_mode
, int,
951 rtx
, rtx
, rtx
, rtx
));