1 /* Definitions for code generation pass of GNU compiler.
2 Copyright (C) 1987, 91-98, 1999 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 If more than one insn is emitted, this is the first insn. */
35 #define QUEUED_INSN(P) XEXP (P, 1)
36 /* If a pre-increment copy has been generated, this is the copy
37 (it is a temporary reg). Zero if no copy made yet. */
38 #define QUEUED_COPY(P) XEXP (P, 2)
39 /* This is the body to use for the insn to do the increment.
40 It is used to emit the increment. */
41 #define QUEUED_BODY(P) XEXP (P, 3)
42 /* Next QUEUED in the queue. */
43 #define QUEUED_NEXT(P) XEXP (P, 4)
45 /* This is the 4th arg to `expand_expr'.
46 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
47 EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
48 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
49 is a constant that is not a legitimate address.
50 EXPAND_MEMORY_USE_* are explained below. */
51 enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM,
52 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER,
53 EXPAND_MEMORY_USE_WO, EXPAND_MEMORY_USE_RW,
54 EXPAND_MEMORY_USE_BAD, EXPAND_MEMORY_USE_DONT};
56 /* Argument for chkr_* functions.
57 MEMORY_USE_RO: the pointer reads memory.
58 MEMORY_USE_WO: the pointer writes to memory.
59 MEMORY_USE_RW: the pointer modifies memory (ie it reads and writes). An
61 MEMORY_USE_BAD: use this if you don't know the behavior of the pointer, or
62 if you know there are no pointers. Using an INDIRECT_REF
63 with MEMORY_USE_BAD will abort.
64 MEMORY_USE_TW: just test for writing, without update. Special.
65 MEMORY_USE_DONT: the memory is neither read nor written. This is used by
67 enum memory_use_mode {MEMORY_USE_BAD = 0, MEMORY_USE_RO = 1,
68 MEMORY_USE_WO = 2, MEMORY_USE_RW = 3,
69 MEMORY_USE_TW = 6, MEMORY_USE_DONT = 99};
71 /* Prevent the compiler from deferring stack pops. See
72 inhibit_defer_pop for more information. */
73 #define NO_DEFER_POP (inhibit_defer_pop += 1)
75 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for
77 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
79 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
80 /* Structure to record the size of a sequence of arguments
81 as the sum of a tree-expression and a constant. */
85 HOST_WIDE_INT constant;
90 /* Add the value of the tree INC to the `struct args_size' TO. */
92 #define ADD_PARM_SIZE(TO, INC) \
94 if (TREE_CODE (inc) == INTEGER_CST) \
95 (TO).constant += TREE_INT_CST_LOW (inc); \
96 else if ((TO).var == 0) \
99 (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
101 #define SUB_PARM_SIZE(TO, DEC) \
102 { tree dec = (DEC); \
103 if (TREE_CODE (dec) == INTEGER_CST) \
104 (TO).constant -= TREE_INT_CST_LOW (dec); \
105 else if ((TO).var == 0) \
106 (TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
108 (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
110 /* Convert the implicit sum in a `struct args_size' into an rtx. */
111 #define ARGS_SIZE_RTX(SIZE) \
112 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
113 : expand_expr (size_binop (PLUS_EXPR, (SIZE).var, \
114 size_int ((SIZE).constant)), \
115 NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD))
117 /* Convert the implicit sum in a `struct args_size' into a tree. */
118 #define ARGS_SIZE_TREE(SIZE) \
119 ((SIZE).var == 0 ? size_int ((SIZE).constant) \
120 : size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
122 /* Supply a default definition for FUNCTION_ARG_PADDING:
123 usually pad upward, but pad short args downward on
124 big-endian machines. */
126 enum direction {none, upward, downward}; /* Value has this type. */
128 #ifndef FUNCTION_ARG_PADDING
129 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
130 (! BYTES_BIG_ENDIAN \
132 : (((MODE) == BLKmode \
133 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
134 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
135 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
136 ? downward : upward))
139 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
140 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
143 #ifndef FUNCTION_ARG_BOUNDARY
144 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
147 /* Provide a default value for STRICT_ARGUMENT_NAMING. */
148 #ifndef STRICT_ARGUMENT_NAMING
149 #define STRICT_ARGUMENT_NAMING 0
152 /* Provide a default value for PRETEND_OUTGOING_VARARGS_NAMED. */
153 #ifdef SETUP_INCOMING_VARARGS
154 #ifndef PRETEND_OUTGOING_VARARGS_NAMED
155 #define PRETEND_OUTGOING_VARARGS_NAMED 1
158 /* It is an error to define PRETEND_OUTGOING_VARARGS_NAMED without
159 defining SETUP_INCOMING_VARARGS. */
160 #define PRETEND_OUTGOING_VARARGS_NAMED 0
163 /* Nonzero if we do not know how to pass TYPE solely in registers.
164 We cannot do so in the following cases:
166 - if the type has variable size
167 - if the type is marked as addressable (it is required to be constructed
169 - if the padding and mode of the type is such that a copy into a register
170 would put it into the wrong part of the register.
172 Which padding can't be supported depends on the byte endianness.
174 A value in a register is implicitly padded at the most significant end.
175 On a big-endian machine, that is the lower end in memory.
176 So a value padded in memory at the upper end can't go in a register.
177 For a little-endian machine, the reverse is true. */
179 #ifndef MUST_PASS_IN_STACK
180 #define MUST_PASS_IN_STACK(MODE,TYPE) \
182 && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
183 || TREE_ADDRESSABLE (TYPE) \
184 || ((MODE) == BLKmode \
185 && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
186 && 0 == (int_size_in_bytes (TYPE) \
187 % (PARM_BOUNDARY / BITS_PER_UNIT))) \
188 && (FUNCTION_ARG_PADDING (MODE, TYPE) \
189 == (BYTES_BIG_ENDIAN ? upward : downward)))))
192 /* Nonzero if type TYPE should be returned in memory.
193 Most machines can use the following default definition. */
195 #ifndef RETURN_IN_MEMORY
196 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
199 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
200 Normally move_insn, so Pmode stack pointer. */
202 #ifndef STACK_SAVEAREA_MODE
203 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
206 /* Supply a default definition of STACK_SIZE_MODE for
207 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */
209 #ifndef STACK_SIZE_MODE
210 #define STACK_SIZE_MODE word_mode
213 /* Provide default values for the macros controlling stack checking. */
215 #ifndef STACK_CHECK_BUILTIN
216 #define STACK_CHECK_BUILTIN 0
219 /* The default interval is one page. */
220 #ifndef STACK_CHECK_PROBE_INTERVAL
221 #define STACK_CHECK_PROBE_INTERVAL 4096
224 /* The default is to do a store into the stack. */
225 #ifndef STACK_CHECK_PROBE_LOAD
226 #define STACK_CHECK_PROBE_LOAD 0
229 /* This value is arbitrary, but should be sufficient for most machines. */
230 #ifndef STACK_CHECK_PROTECT
231 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
234 /* Make the maximum frame size be the largest we can and still only need
235 one probe per function. */
236 #ifndef STACK_CHECK_MAX_FRAME_SIZE
237 #define STACK_CHECK_MAX_FRAME_SIZE \
238 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
241 /* This is arbitrary, but should be large enough everywhere. */
242 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
243 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
246 /* Provide a reasonable default for the maximum size of an object to
247 allocate in the fixed frame. We may need to be able to make this
248 controllable by the user at some point. */
249 #ifndef STACK_CHECK_MAX_VAR_SIZE
250 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
253 /* Optabs are tables saying how to generate insn bodies
254 for various machine modes and numbers of operands.
255 Each optab applies to one operation.
256 For example, add_optab applies to addition.
258 The insn_code slot is the enum insn_code that says how to
259 generate an insn for this operation on a particular machine mode.
260 It is CODE_FOR_nothing if there is no such insn on the target machine.
262 The `lib_call' slot is the name of the library function that
263 can be used to perform the operation.
265 A few optabs, such as move_optab and cmp_optab, are used
268 /* Everything that uses expr.h needs to define enum insn_code
269 but we don't list it in the Makefile dependencies just for that. */
270 #include "insn-codes.h"
276 enum insn_code insn_code;
278 } handlers [NUM_MACHINE_MODES];
281 /* Given an enum insn_code, access the function to construct
282 the body of that kind of insn. */
283 #ifdef FUNCTION_CONVERSION_BUG
284 /* Some compilers fail to convert a function properly to a
285 pointer-to-function when used as an argument.
286 So produce the pointer-to-function directly.
287 Luckily, these compilers seem to work properly when you
288 call the pointer-to-function. */
289 #define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
291 #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
294 extern rtx (*const insn_gen_function[]) PROTO ((rtx, ...));
296 extern optab add_optab;
297 extern optab sub_optab;
298 extern optab smul_optab; /* Signed and floating-point multiply */
299 extern optab smul_highpart_optab; /* Signed multiply, return high word */
300 extern optab umul_highpart_optab;
301 extern optab smul_widen_optab; /* Signed multiply with result
302 one machine mode wider than args */
303 extern optab umul_widen_optab;
304 extern optab sdiv_optab; /* Signed divide */
305 extern optab sdivmod_optab; /* Signed divide-and-remainder in one */
306 extern optab udiv_optab;
307 extern optab udivmod_optab;
308 extern optab smod_optab; /* Signed remainder */
309 extern optab umod_optab;
310 extern optab flodiv_optab; /* Optab for floating divide. */
311 extern optab ftrunc_optab; /* Convert float to integer in float fmt */
312 extern optab and_optab; /* Logical and */
313 extern optab ior_optab; /* Logical or */
314 extern optab xor_optab; /* Logical xor */
315 extern optab ashl_optab; /* Arithmetic shift left */
316 extern optab ashr_optab; /* Arithmetic shift right */
317 extern optab lshr_optab; /* Logical shift right */
318 extern optab rotl_optab; /* Rotate left */
319 extern optab rotr_optab; /* Rotate right */
320 extern optab smin_optab; /* Signed and floating-point minimum value */
321 extern optab smax_optab; /* Signed and floating-point maximum value */
322 extern optab umin_optab; /* Unsigned minimum value */
323 extern optab umax_optab; /* Unsigned maximum value */
325 extern optab mov_optab; /* Move instruction. */
326 extern optab movstrict_optab; /* Move, preserving high part of register. */
328 extern optab cmp_optab; /* Compare insn; two operands. */
329 extern optab tst_optab; /* tst insn; compare one operand against 0 */
331 /* Unary operations */
332 extern optab neg_optab; /* Negation */
333 extern optab abs_optab; /* Abs value */
334 extern optab one_cmpl_optab; /* Bitwise not */
335 extern optab ffs_optab; /* Find first bit set */
336 extern optab sqrt_optab; /* Square root */
337 extern optab sin_optab; /* Sine */
338 extern optab cos_optab; /* Cosine */
339 extern optab strlen_optab; /* String length */
341 /* Tables of patterns for extending one integer mode to another. */
342 extern enum insn_code extendtab[MAX_MACHINE_MODE][MAX_MACHINE_MODE][2];
344 /* Tables of patterns for converting between fixed and floating point. */
345 extern enum insn_code fixtab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
346 extern enum insn_code fixtrunctab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
347 extern enum insn_code floattab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
349 /* Contains the optab used for each rtx code. */
350 extern optab code_to_optab[NUM_RTX_CODE + 1];
352 /* Passed to expand_binop and expand_unop to say which options to try to use
353 if the requested operation can't be open-coded on the requisite mode.
354 Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
355 Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
356 OPTAB_MUST_WIDEN says try widening and don't try anything else. */
367 /* SYMBOL_REF rtx's for the library functions that are called
368 implicitly and not via optabs. */
370 extern rtx extendsfdf2_libfunc;
371 extern rtx extendsfxf2_libfunc;
372 extern rtx extendsftf2_libfunc;
373 extern rtx extenddfxf2_libfunc;
374 extern rtx extenddftf2_libfunc;
376 extern rtx truncdfsf2_libfunc;
377 extern rtx truncxfsf2_libfunc;
378 extern rtx trunctfsf2_libfunc;
379 extern rtx truncxfdf2_libfunc;
380 extern rtx trunctfdf2_libfunc;
382 extern rtx memcpy_libfunc;
383 extern rtx bcopy_libfunc;
384 extern rtx memcmp_libfunc;
385 extern rtx bcmp_libfunc;
386 extern rtx memset_libfunc;
387 extern rtx bzero_libfunc;
389 extern rtx throw_libfunc;
390 extern rtx rethrow_libfunc;
391 extern rtx sjthrow_libfunc;
392 extern rtx sjpopnthrow_libfunc;
393 extern rtx terminate_libfunc;
394 extern rtx setjmp_libfunc;
395 extern rtx longjmp_libfunc;
396 extern rtx eh_rtime_match_libfunc;
398 extern rtx eqhf2_libfunc;
399 extern rtx nehf2_libfunc;
400 extern rtx gthf2_libfunc;
401 extern rtx gehf2_libfunc;
402 extern rtx lthf2_libfunc;
403 extern rtx lehf2_libfunc;
405 extern rtx eqsf2_libfunc;
406 extern rtx nesf2_libfunc;
407 extern rtx gtsf2_libfunc;
408 extern rtx gesf2_libfunc;
409 extern rtx ltsf2_libfunc;
410 extern rtx lesf2_libfunc;
412 extern rtx eqdf2_libfunc;
413 extern rtx nedf2_libfunc;
414 extern rtx gtdf2_libfunc;
415 extern rtx gedf2_libfunc;
416 extern rtx ltdf2_libfunc;
417 extern rtx ledf2_libfunc;
419 extern rtx eqxf2_libfunc;
420 extern rtx nexf2_libfunc;
421 extern rtx gtxf2_libfunc;
422 extern rtx gexf2_libfunc;
423 extern rtx ltxf2_libfunc;
424 extern rtx lexf2_libfunc;
426 extern rtx eqtf2_libfunc;
427 extern rtx netf2_libfunc;
428 extern rtx gttf2_libfunc;
429 extern rtx getf2_libfunc;
430 extern rtx lttf2_libfunc;
431 extern rtx letf2_libfunc;
433 extern rtx floatsisf_libfunc;
434 extern rtx floatdisf_libfunc;
435 extern rtx floattisf_libfunc;
437 extern rtx floatsidf_libfunc;
438 extern rtx floatdidf_libfunc;
439 extern rtx floattidf_libfunc;
441 extern rtx floatsixf_libfunc;
442 extern rtx floatdixf_libfunc;
443 extern rtx floattixf_libfunc;
445 extern rtx floatsitf_libfunc;
446 extern rtx floatditf_libfunc;
447 extern rtx floattitf_libfunc;
449 extern rtx fixsfsi_libfunc;
450 extern rtx fixsfdi_libfunc;
451 extern rtx fixsfti_libfunc;
453 extern rtx fixdfsi_libfunc;
454 extern rtx fixdfdi_libfunc;
455 extern rtx fixdfti_libfunc;
457 extern rtx fixxfsi_libfunc;
458 extern rtx fixxfdi_libfunc;
459 extern rtx fixxfti_libfunc;
461 extern rtx fixtfsi_libfunc;
462 extern rtx fixtfdi_libfunc;
463 extern rtx fixtfti_libfunc;
465 extern rtx fixunssfsi_libfunc;
466 extern rtx fixunssfdi_libfunc;
467 extern rtx fixunssfti_libfunc;
469 extern rtx fixunsdfsi_libfunc;
470 extern rtx fixunsdfdi_libfunc;
471 extern rtx fixunsdfti_libfunc;
473 extern rtx fixunsxfsi_libfunc;
474 extern rtx fixunsxfdi_libfunc;
475 extern rtx fixunsxfti_libfunc;
477 extern rtx fixunstfsi_libfunc;
478 extern rtx fixunstfdi_libfunc;
479 extern rtx fixunstfti_libfunc;
481 /* For check-memory-usage. */
482 extern rtx chkr_check_addr_libfunc;
483 extern rtx chkr_set_right_libfunc;
484 extern rtx chkr_copy_bitmap_libfunc;
485 extern rtx chkr_check_exec_libfunc;
486 extern rtx chkr_check_str_libfunc;
488 /* For instrument-functions. */
489 extern rtx profile_function_entry_libfunc;
490 extern rtx profile_function_exit_libfunc;
492 typedef rtx (*rtxfun) PROTO ((rtx));
494 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
495 gives the gen_function to make a branch to test that condition. */
497 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
499 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
500 gives the insn code to make a store-condition insn
501 to test that condition. */
503 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
505 #ifdef HAVE_conditional_move
506 /* Indexed by the machine mode, gives the insn code to make a conditional
509 extern enum insn_code movcc_gen_code[NUM_MACHINE_MODES];
512 /* This array records the insn_code of insns to perform block moves. */
513 extern enum insn_code movstr_optab[NUM_MACHINE_MODES];
515 /* This array records the insn_code of insns to perform block clears. */
516 extern enum insn_code clrstr_optab[NUM_MACHINE_MODES];
518 /* Define functions given in optabs.c. */
520 /* Expand a binary operation given optab and rtx operands. */
521 extern rtx expand_binop PROTO((enum machine_mode, optab, rtx, rtx, rtx,
522 int, enum optab_methods));
524 /* Expand a binary operation with both signed and unsigned forms. */
525 extern rtx sign_expand_binop PROTO((enum machine_mode, optab, optab, rtx,
526 rtx, rtx, int, enum optab_methods));
528 /* Generate code to perform an operation on two operands with two results. */
529 extern int expand_twoval_binop PROTO((optab, rtx, rtx, rtx, rtx, int));
531 /* Expand a unary arithmetic operation given optab rtx operand. */
532 extern rtx expand_unop PROTO((enum machine_mode, optab, rtx, rtx, int));
534 /* Expand the absolute value operation. */
535 extern rtx expand_abs PROTO((enum machine_mode, rtx, rtx, int));
537 /* Expand the complex absolute value operation. */
538 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
540 /* Generate an instruction with a given INSN_CODE with an output and
542 extern void emit_unop_insn PROTO((int, rtx, rtx, enum rtx_code));
544 /* Emit code to perform a series of operations on a multi-word quantity, one
546 extern rtx emit_no_conflict_block PROTO((rtx, rtx, rtx, rtx, rtx));
548 /* Emit code to make a call to a constant function or a library call. */
549 extern void emit_libcall_block PROTO((rtx, rtx, rtx, rtx));
551 /* Emit one rtl instruction to store zero in specified rtx. */
552 extern void emit_clr_insn PROTO((rtx));
554 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0. */
555 extern void emit_0_to_1_insn PROTO((rtx));
557 /* Emit one rtl insn to compare two rtx's. */
558 extern void emit_cmp_insn PROTO((rtx, rtx, enum rtx_code, rtx,
559 enum machine_mode, int, int));
561 /* Emit a pair of rtl insns to compare two rtx's and to jump
562 to a label if the comparison is true. */
563 extern void emit_cmp_and_jump_insns PROTO((rtx, rtx, enum rtx_code, rtx,
564 enum machine_mode, int, int, rtx));
566 /* Nonzero if a compare of mode MODE can be done straightforwardly
567 (without splitting it into pieces). */
568 extern int can_compare_p PROTO((enum machine_mode));
570 /* Emit a library call comparison between floating point X and Y.
571 COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.). */
572 extern void emit_float_lib_cmp PROTO((rtx, rtx, enum rtx_code));
574 /* Generate code to indirectly jump to a location given in the rtx LOC. */
575 extern void emit_indirect_jump PROTO((rtx));
577 #ifdef HAVE_conditional_move
578 /* Emit a conditional move operation. */
579 rtx emit_conditional_move PROTO((rtx, enum rtx_code, rtx, rtx,
580 enum machine_mode, rtx, rtx,
581 enum machine_mode, int));
583 /* Return non-zero if the conditional move is supported. */
584 int can_conditionally_move_p PROTO((enum machine_mode mode));
588 /* Create but don't emit one rtl instruction to add one rtx into another.
589 Modes must match; operands must meet the operation's predicates.
590 Likewise for subtraction and for just copying.
591 These do not call protect_from_queue; caller must do so. */
592 extern rtx gen_add2_insn PROTO((rtx, rtx));
593 extern rtx gen_sub2_insn PROTO((rtx, rtx));
594 extern rtx gen_move_insn PROTO((rtx, rtx));
595 extern int have_add2_insn PROTO((enum machine_mode));
596 extern int have_sub2_insn PROTO((enum machine_mode));
598 /* Return the INSN_CODE to use for an extend operation. */
599 extern enum insn_code can_extend_p PROTO((enum machine_mode,
600 enum machine_mode, int));
602 /* Generate the body of an insn to extend Y (with mode MFROM)
603 into X (with mode MTO). Do zero-extension if UNSIGNEDP is nonzero. */
604 extern rtx gen_extend_insn PROTO((rtx, rtx, enum machine_mode,
605 enum machine_mode, int));
607 /* Initialize the tables that control conversion between fixed and
609 extern void init_fixtab PROTO((void));
610 extern void init_floattab PROTO((void));
612 /* Generate code for a FLOAT_EXPR. */
613 extern void expand_float PROTO((rtx, rtx, int));
615 /* Generate code for a FIX_EXPR. */
616 extern void expand_fix PROTO((rtx, rtx, int));
618 /* Call this once to initialize the contents of the optabs
619 appropriately for the current target machine. */
620 extern void init_optabs PROTO((void));
622 /* Functions from expmed.c: */
624 /* Arguments MODE, RTX: return an rtx for the negation of that value.
626 extern rtx negate_rtx PROTO((enum machine_mode, rtx));
628 /* Expand a logical AND operation. */
629 extern rtx expand_and PROTO((rtx, rtx, rtx));
631 /* Emit a store-flag operation. */
632 extern rtx emit_store_flag PROTO((rtx, enum rtx_code, rtx, rtx,
633 enum machine_mode, int, int));
635 /* Like emit_store_flag, but always succeeds. */
636 extern rtx emit_store_flag_force PROTO((rtx, enum rtx_code, rtx, rtx,
637 enum machine_mode, int, int));
639 /* Functions from loop.c: */
641 /* Given a JUMP_INSN, return a description of the test being made. */
642 extern rtx get_condition PROTO((rtx, rtx *));
644 /* Generate a conditional trap instruction. */
645 extern rtx gen_cond_trap PROTO((enum rtx_code, rtx, rtx, rtx));
647 /* Functions from builtins.c: */
649 extern rtx expand_builtin PROTO((tree, rtx, rtx, enum machine_mode, int));
650 extern void std_expand_builtin_va_start PROTO((int, tree, rtx));
651 extern rtx std_expand_builtin_va_arg PROTO((tree, tree));
652 extern rtx expand_builtin_va_arg PROTO((tree, tree));
655 extern rtx expand_builtin_setjmp PROTO((rtx, rtx, rtx, rtx));
656 extern rtx expand_builtin_saveregs PROTO((void));
657 extern int get_varargs_alias_set PROTO((void));
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 /* This is run at the end of compiling a function. */
669 extern void finish_expr_for_function PROTO((void));
671 /* Use protect_from_queue to convert a QUEUED expression
672 into something that you can put immediately into an instruction. */
673 extern rtx protect_from_queue PROTO((rtx, int));
675 /* Perform all the pending incrementations. */
676 extern void emit_queue PROTO((void));
678 /* Tell if something has a queued subexpression. */
679 extern int queued_subexp_p PROTO((rtx));
681 /* Emit some rtl insns to move data between rtx's, converting machine modes.
682 Both modes must be floating or both fixed. */
683 extern void convert_move PROTO((rtx, rtx, int));
685 /* Convert an rtx to specified machine mode and return the result. */
686 extern rtx convert_to_mode PROTO((enum machine_mode, rtx, int));
688 /* Convert an rtx to MODE from OLDMODE and return the result. */
689 extern rtx convert_modes PROTO((enum machine_mode, enum machine_mode, rtx, int));
691 /* Emit code to move a block Y to a block X. */
692 extern rtx emit_block_move PROTO((rtx, rtx, rtx, int));
694 /* Copy all or part of a value X into registers starting at REGNO.
695 The number of registers to be filled is NREGS. */
696 extern void move_block_to_reg PROTO((int, rtx, int, enum machine_mode));
698 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
699 The number of registers to be filled is NREGS. */
700 extern void move_block_from_reg PROTO((int, rtx, int, int));
702 /* Load a BLKmode value into non-consecutive registers represented by a
704 extern void emit_group_load PROTO((rtx, rtx, int, int));
705 /* Store a BLKmode value from non-consecutive registers represented by a
707 extern void emit_group_store PROTO((rtx, rtx, int, int));
710 /* Copy BLKmode object from a set of registers. */
711 extern rtx copy_blkmode_from_reg PROTO((rtx,rtx,tree));
714 /* Mark REG as holding a parameter for the next CALL_INSN. */
715 extern void use_reg PROTO((rtx *, rtx));
716 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
717 for the next CALL_INSN. */
718 extern void use_regs PROTO((rtx *, int, int));
719 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
720 extern void use_group_regs PROTO((rtx *, rtx));
722 /* Write zeros through the storage of OBJECT.
723 If OBJECT has BLKmode, SIZE is its length in bytes and ALIGN is its
725 extern rtx clear_storage PROTO((rtx, rtx, int));
727 /* Emit insns to set X from Y. */
728 extern rtx emit_move_insn PROTO((rtx, rtx));
730 /* Emit insns to set X from Y, with no frills. */
731 extern rtx emit_move_insn_1 PROTO ((rtx, rtx));
733 /* Push a block of length SIZE (perhaps variable)
734 and return an rtx to address the beginning of the block. */
735 extern rtx push_block PROTO((rtx, int, int));
737 /* Make an operand to push something on the stack. */
738 extern rtx gen_push_operand PROTO((void));
741 /* Generate code to push something onto the stack, given its mode and type. */
742 extern void emit_push_insn PROTO((rtx, enum machine_mode, tree, rtx, int,
743 int, rtx, int, rtx, rtx, int));
745 /* Emit library call. */
746 extern void emit_library_call PVPROTO((rtx orgfun, int no_queue,
747 enum machine_mode outmode, int nargs, ...));
748 extern rtx emit_library_call_value PVPROTO((rtx orgfun, rtx value, int no_queue,
749 enum machine_mode outmode, int nargs, ...));
751 /* Expand an assignment that stores the value of FROM into TO. */
752 extern rtx expand_assignment PROTO((tree, tree, int, int));
754 /* Generate code for computing expression EXP,
755 and storing the value into TARGET.
756 If SUGGEST_REG is nonzero, copy the value through a register
757 and return that register, if that is possible. */
758 extern rtx store_expr PROTO((tree, rtx, int));
761 /* Given an rtx that may include add and multiply operations,
762 generate them as insns and return a pseudo-reg containing the value.
763 Useful after calling expand_expr with 1 as sum_ok. */
764 extern rtx force_operand PROTO((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 /* Return the tree node and offset if a given argument corresponds to
787 a string constant. */
788 extern tree string_constant PROTO((tree, tree *));
790 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
791 extern void jumpifnot PROTO((tree, rtx));
793 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
794 extern void jumpif PROTO((tree, rtx));
796 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
797 the result is zero, or IF_TRUE_LABEL if the result is one. */
798 extern void do_jump PROTO((tree, rtx, rtx));
801 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
802 extern rtx compare_from_rtx PROTO((rtx, rtx, enum rtx_code, int,
803 enum machine_mode, rtx, int));
804 extern void do_compare_rtx_and_jump PROTO((rtx, rtx, enum rtx_code, int,
805 enum machine_mode, rtx, int,
808 /* Generate a tablejump instruction (used for switch statements). */
809 extern void do_tablejump PROTO((rtx, enum machine_mode, rtx, rtx, rtx));
812 /* rtl.h and tree.h were included. */
813 /* Return an rtx for the size in bytes of the value of an expr. */
814 extern rtx expr_size PROTO((tree));
816 extern rtx lookup_static_chain PROTO((tree));
818 /* Convert a stack slot address ADDR valid in function FNDECL
819 into an address valid in this function (using a static chain). */
820 extern rtx fix_lexical_addr PROTO((rtx, tree));
822 /* Return the address of the trampoline for entering nested fn FUNCTION. */
823 extern rtx trampoline_address PROTO((tree));
825 /* Return an rtx that refers to the value returned by a function
826 in its original home. This becomes invalid if any more code is emitted. */
827 extern rtx hard_function_value PROTO((tree, tree));
829 extern rtx prepare_call_address PROTO((rtx, tree, rtx *, int));
831 extern rtx expand_call PROTO((tree, rtx, int));
833 extern rtx expand_shift PROTO((enum tree_code, enum machine_mode, rtx, tree, rtx, int));
834 extern rtx expand_divmod PROTO((int, enum tree_code, enum machine_mode, rtx, rtx, rtx, int));
835 extern void locate_and_pad_parm PROTO((enum machine_mode, tree, int, tree, struct args_size *, struct args_size *, struct args_size *));
836 extern rtx expand_inline_function PROTO((tree, tree, rtx, int, tree, rtx));
837 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
838 extern rtx label_rtx PROTO((tree));
841 /* Indicate how an input argument register was promoted. */
842 extern rtx promoted_input_arg PROTO((int, enum machine_mode *, int *));
844 /* Return an rtx like arg but sans any constant terms.
845 Returns the original rtx if it has no constant terms.
846 The constant terms are added and stored via a second arg. */
847 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
849 /* Convert arg to a valid memory address for specified machine mode,
850 by emitting insns to perform arithmetic if nec. */
851 extern rtx memory_address PROTO((enum machine_mode, rtx));
853 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
854 extern rtx memory_address_noforce PROTO((enum machine_mode, rtx));
856 /* Return a memory reference like MEMREF, but with its mode changed
857 to MODE and its address changed to ADDR.
858 (VOIDmode means don't change the mode.
859 NULL for ADDR means don't change the address.) */
860 extern rtx change_address PROTO((rtx, enum machine_mode, rtx));
862 /* Return a memory reference like MEMREF, but which is known to have a
865 extern rtx validize_mem PROTO((rtx));
867 /* Assemble the static constant template for function entry trampolines. */
868 extern rtx assemble_trampoline_template PROTO((void));
870 /* Return 1 if two rtx's are equivalent in structure and elements. */
871 extern int rtx_equal_p PROTO((rtx, rtx));
873 /* Given rtx, return new rtx whose address won't be affected by
874 any side effects. It has been copied to a new temporary reg. */
875 extern rtx stabilize PROTO((rtx));
877 /* Given an rtx, copy all regs it refers to into new temps
878 and return a modified copy that refers to the new temps. */
879 extern rtx copy_all_regs PROTO((rtx));
881 /* Copy given rtx to a new temp reg and return that. */
882 extern rtx copy_to_reg PROTO((rtx));
884 /* Like copy_to_reg but always make the reg Pmode. */
885 extern rtx copy_addr_to_reg PROTO((rtx));
887 /* Like copy_to_reg but always make the reg the specified mode MODE. */
888 extern rtx copy_to_mode_reg PROTO((enum machine_mode, rtx));
890 /* Copy given rtx to given temp reg and return that. */
891 extern rtx copy_to_suggested_reg PROTO((rtx, rtx, enum machine_mode));
893 /* Copy a value to a register if it isn't already a register.
894 Args are mode (in case value is a constant) and the value. */
895 extern rtx force_reg PROTO((enum machine_mode, rtx));
897 /* Return given rtx, copied into a new temp reg if it was in memory. */
898 extern rtx force_not_mem PROTO((rtx));
901 /* Return mode and signedness to use when object is promoted. */
902 extern enum machine_mode promote_mode PROTO((tree, enum machine_mode,
906 /* Remove some bytes from the stack. An rtx says how many. */
907 extern void adjust_stack PROTO((rtx));
909 /* Add some bytes to the stack. An rtx says how many. */
910 extern void anti_adjust_stack PROTO((rtx));
912 /* This enum is used for the following two functions. */
913 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
915 /* Save the stack pointer at the specified level. */
916 extern void emit_stack_save PROTO((enum save_level, rtx *, rtx));
918 /* Restore the stack pointer from a save area of the specified level. */
919 extern void emit_stack_restore PROTO((enum save_level, rtx, rtx));
921 /* Allocate some space on the stack dynamically and return its address. An rtx
922 says how many bytes. */
923 extern rtx allocate_dynamic_stack_space PROTO((rtx, rtx, int));
925 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
926 FIRST is a constant and size is a Pmode RTX. These are offsets from the
927 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
928 subtract from the stack. If SIZE is constant, this is done
929 with a fixed number of probes. Otherwise, we must make a loop. */
930 extern void probe_stack_range PROTO((HOST_WIDE_INT, rtx));
932 /* Return an rtx that refers to the value returned by a library call
933 in its original home. This becomes invalid if any more code is emitted. */
934 extern rtx hard_libcall_value PROTO((enum machine_mode));
936 /* Given an rtx, return an rtx for a value rounded up to a multiple
937 of STACK_BOUNDARY / BITS_PER_UNIT. */
938 extern rtx round_push PROTO((rtx));
940 extern rtx store_bit_field PROTO((rtx, int, int, enum machine_mode, rtx, int, int));
941 extern rtx extract_bit_field PROTO((rtx, int, int, int, rtx, enum machine_mode, enum machine_mode, int, int));
942 extern rtx expand_mult PROTO((enum machine_mode, rtx, rtx, rtx, int));
943 extern rtx expand_mult_add PROTO((rtx, rtx, rtx, rtx,enum machine_mode, int));
944 extern rtx expand_mult_highpart_adjust PROTO((enum machine_mode, rtx, rtx, rtx, rtx, int));
946 extern rtx assemble_static_space PROTO((int));
948 /* Hook called by expand_expr for language-specific tree codes.
949 It is up to the language front end to install a hook
950 if it has any such codes that expand_expr needs to know about. */
951 extern rtx (*lang_expand_expr) PROTO ((union tree_node *, rtx,
953 enum expand_modifier modifier));
956 /* Hook called by output_constant for language-specific tree codes.
957 It is up to the language front-end to install a hook if it has any
958 such codes that output_constant needs to know about. Returns a
959 language-independent constant equivalent to its input. */
960 extern tree (*lang_expand_constant) PROTO((tree));
963 extern void init_all_optabs PROTO ((void));
964 extern void init_mov_optab PROTO ((void));
965 extern void do_jump_by_parts_equality_rtx PROTO((rtx, rtx, rtx));
966 extern void do_jump_by_parts_greater_rtx PROTO ((enum machine_mode, int,
967 rtx, rtx, rtx, rtx));
969 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
970 extern void mark_seen_cases PROTO ((tree, unsigned char *,