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 enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM,
50 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER};
52 /* List of labels that must never be deleted. */
53 extern rtx forced_labels;
55 /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
56 So we can mark them all live at the end of the function, if stupid. */
57 extern rtx save_expr_regs;
59 extern int current_function_calls_alloca;
60 extern int current_function_outgoing_args_size;
62 /* This is the offset from the arg pointer to the place where the first
63 anonymous arg can be found, if there is one. */
64 extern rtx current_function_arg_offset_rtx;
66 /* This is nonzero if the current function uses the constant pool. */
67 extern int current_function_uses_const_pool;
69 /* This is nonzero if the current function uses pic_offset_table_rtx. */
70 extern int current_function_uses_pic_offset_table;
72 /* The arg pointer hard register, or the pseudo into which it was copied. */
73 extern rtx current_function_internal_arg_pointer;
75 /* Nonzero means stack pops must not be deferred, and deferred stack
76 pops must not be output. It is nonzero inside a function call,
77 inside a conditional expression, inside a statement expression,
78 and in other cases as well. */
79 extern int inhibit_defer_pop;
81 /* Number of function calls seen so far in current function. */
83 extern int function_call_count;
85 /* RTX for stack slot that holds the current handler for nonlocal gotos.
86 Zero when function does not have nonlocal labels. */
88 extern rtx nonlocal_goto_handler_slot;
90 /* RTX for stack slot that holds the stack pointer value to restore
92 Zero when function does not have nonlocal labels. */
94 extern rtx nonlocal_goto_stack_level;
96 /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
97 (labels to which there can be nonlocal gotos from nested functions)
100 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
101 extern tree nonlocal_labels;
104 #define NO_DEFER_POP (inhibit_defer_pop += 1)
105 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
107 /* Number of units that we should eventually pop off the stack.
108 These are the arguments to function calls that have already returned. */
109 extern int pending_stack_adjust;
111 /* When temporaries are created by TARGET_EXPRs, they are created at
112 this level of temp_slot_level, so that they can remain allocated
113 until no longer needed. CLEANUP_POINT_EXPRs define the lifetime
115 extern int target_temp_slot_level;
117 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
118 /* Structure to record the size of a sequence of arguments
119 as the sum of a tree-expression and a constant. */
128 /* Add the value of the tree INC to the `struct args_size' TO. */
130 #define ADD_PARM_SIZE(TO, INC) \
131 { tree inc = (INC); \
132 if (TREE_CODE (inc) == INTEGER_CST) \
133 (TO).constant += TREE_INT_CST_LOW (inc); \
134 else if ((TO).var == 0) \
137 (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
139 #define SUB_PARM_SIZE(TO, DEC) \
140 { tree dec = (DEC); \
141 if (TREE_CODE (dec) == INTEGER_CST) \
142 (TO).constant -= TREE_INT_CST_LOW (dec); \
143 else if ((TO).var == 0) \
144 (TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
146 (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
148 /* Convert the implicit sum in a `struct args_size' into an rtx. */
149 #define ARGS_SIZE_RTX(SIZE) \
150 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
151 : expand_expr (size_binop (PLUS_EXPR, (SIZE).var, \
152 size_int ((SIZE).constant)), \
153 NULL_RTX, VOIDmode, 0))
155 /* Convert the implicit sum in a `struct args_size' into a tree. */
156 #define ARGS_SIZE_TREE(SIZE) \
157 ((SIZE).var == 0 ? size_int ((SIZE).constant) \
158 : size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
160 /* Supply a default definition for FUNCTION_ARG_PADDING:
161 usually pad upward, but pad short args downward on
162 big-endian machines. */
164 enum direction {none, upward, downward}; /* Value has this type. */
166 #ifndef FUNCTION_ARG_PADDING
167 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
168 (! BYTES_BIG_ENDIAN \
170 : (((MODE) == BLKmode \
171 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
172 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
173 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
174 ? downward : upward))
177 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
178 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
181 #ifndef FUNCTION_ARG_BOUNDARY
182 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
185 /* Nonzero if we do not know how to pass TYPE solely in registers.
186 We cannot do so in the following cases:
188 - if the type has variable size
189 - if the type is marked as addressable (it is required to be constructed
191 - if the padding and mode of the type is such that a copy into a register
192 would put it into the wrong part of the register.
194 Which padding can't be supported depends on the byte endianness.
196 A value in a register is implicitly padded at the most significant end.
197 On a big-endian machine, that is the lower end in memory.
198 So a value padded in memory at the upper end can't go in a register.
199 For a little-endian machine, the reverse is true. */
201 #define MUST_PASS_IN_STACK(MODE,TYPE) \
203 && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
204 || TREE_ADDRESSABLE (TYPE) \
205 || ((MODE) == BLKmode \
206 && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
207 && 0 == (int_size_in_bytes (TYPE) \
208 % (PARM_BOUNDARY / BITS_PER_UNIT))) \
209 && (FUNCTION_ARG_PADDING (MODE, TYPE) \
210 == (BYTES_BIG_ENDIAN ? upward : downward)))))
212 /* Nonzero if type TYPE should be returned in memory.
213 Most machines can use the following default definition. */
215 #ifndef RETURN_IN_MEMORY
216 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
219 /* Provide default values for the macros controlling stack checking. */
221 #ifndef STACK_CHECK_BUILTIN
222 #define STACK_CHECK_BUILTIN 0
225 /* The default interval is one page. */
226 #ifndef STACK_CHECK_PROBE_INTERVAL
227 #define STACK_CHECK_PROBE_INTERVAL 4096
230 /* The default is to do a store into the stack. */
231 #ifndef STACK_CHECK_PROBE_LOAD
232 #define STACK_CHECK_PROBE_LOAD 0
235 /* This value is arbitrary, but should be sufficient for most machines. */
236 #ifndef STACK_CHECK_PROTECT
237 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
240 /* Make the maximum frame size be the largest we can and still only need
241 one probe per function. */
242 #ifndef STACK_CHECK_MAX_FRAME_SIZE
243 #define STACK_CHECK_MAX_FRAME_SIZE \
244 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
247 /* This is arbitrary, but should be large enough everywhere. */
248 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
249 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
252 /* Provide a reasonable default for the maximum size of an object to
253 allocate in the fixed frame. We may need to be able to make this
254 controllable by the user at some point. */
255 #ifndef STACK_CHECK_MAX_VAR_SIZE
256 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
259 /* Optabs are tables saying how to generate insn bodies
260 for various machine modes and numbers of operands.
261 Each optab applies to one operation.
262 For example, add_optab applies to addition.
264 The insn_code slot is the enum insn_code that says how to
265 generate an insn for this operation on a particular machine mode.
266 It is CODE_FOR_nothing if there is no such insn on the target machine.
268 The `lib_call' slot is the name of the library function that
269 can be used to perform the operation.
271 A few optabs, such as move_optab and cmp_optab, are used
274 /* Everything that uses expr.h needs to define enum insn_code
275 but we don't list it in the Makefile dependencies just for that. */
276 #include "insn-codes.h"
282 enum insn_code insn_code;
284 } handlers [NUM_MACHINE_MODES];
287 /* Given an enum insn_code, access the function to construct
288 the body of that kind of insn. */
289 #ifdef FUNCTION_CONVERSION_BUG
290 /* Some compilers fail to convert a function properly to a
291 pointer-to-function when used as an argument.
292 So produce the pointer-to-function directly.
293 Luckily, these compilers seem to work properly when you
294 call the pointer-to-function. */
295 #define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
297 #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
300 extern rtx (*const insn_gen_function[]) ();
302 extern optab add_optab;
303 extern optab sub_optab;
304 extern optab smul_optab; /* Signed and floating-point multiply */
305 extern optab smul_highpart_optab; /* Signed multiply, return high word */
306 extern optab umul_highpart_optab;
307 extern optab smul_widen_optab; /* Signed multiply with result
308 one machine mode wider than args */
309 extern optab umul_widen_optab;
310 extern optab sdiv_optab; /* Signed divide */
311 extern optab sdivmod_optab; /* Signed divide-and-remainder in one */
312 extern optab udiv_optab;
313 extern optab udivmod_optab;
314 extern optab smod_optab; /* Signed remainder */
315 extern optab umod_optab;
316 extern optab flodiv_optab; /* Optab for floating divide. */
317 extern optab ftrunc_optab; /* Convert float to integer in float fmt */
318 extern optab and_optab; /* Logical and */
319 extern optab ior_optab; /* Logical or */
320 extern optab xor_optab; /* Logical xor */
321 extern optab ashl_optab; /* Arithmetic shift left */
322 extern optab ashr_optab; /* Arithmetic shift right */
323 extern optab lshr_optab; /* Logical shift right */
324 extern optab rotl_optab; /* Rotate left */
325 extern optab rotr_optab; /* Rotate right */
326 extern optab smin_optab; /* Signed and floating-point minimum value */
327 extern optab smax_optab; /* Signed and floating-point maximum value */
328 extern optab umin_optab; /* Unsigned minimum value */
329 extern optab umax_optab; /* Unsigned maximum value */
331 extern optab mov_optab; /* Move instruction. */
332 extern optab movstrict_optab; /* Move, preserving high part of register. */
334 extern optab cmp_optab; /* Compare insn; two operands. */
335 extern optab tst_optab; /* tst insn; compare one operand against 0 */
337 /* Unary operations */
338 extern optab neg_optab; /* Negation */
339 extern optab abs_optab; /* Abs value */
340 extern optab one_cmpl_optab; /* Bitwise not */
341 extern optab ffs_optab; /* Find first bit set */
342 extern optab sqrt_optab; /* Square root */
343 extern optab sin_optab; /* Sine */
344 extern optab cos_optab; /* Cosine */
345 extern optab strlen_optab; /* String length */
347 /* Tables of patterns for extending one integer mode to another. */
348 extern enum insn_code extendtab[MAX_MACHINE_MODE][MAX_MACHINE_MODE][2];
350 /* Tables of patterns for converting between fixed and floating point. */
351 extern enum insn_code fixtab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
352 extern enum insn_code fixtrunctab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
353 extern enum insn_code floattab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
355 /* Contains the optab used for each rtx code. */
356 extern optab code_to_optab[NUM_RTX_CODE + 1];
358 /* Passed to expand_binop and expand_unop to say which options to try to use
359 if the requested operation can't be open-coded on the requisite mode.
360 Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
361 Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
362 OPTAB_MUST_WIDEN says try widening and don't try anything else. */
373 /* SYMBOL_REF rtx's for the library functions that are called
374 implicitly and not via optabs. */
376 extern rtx extendsfdf2_libfunc;
377 extern rtx extendsfxf2_libfunc;
378 extern rtx extendsftf2_libfunc;
379 extern rtx extenddfxf2_libfunc;
380 extern rtx extenddftf2_libfunc;
382 extern rtx truncdfsf2_libfunc;
383 extern rtx truncxfsf2_libfunc;
384 extern rtx trunctfsf2_libfunc;
385 extern rtx truncxfdf2_libfunc;
386 extern rtx trunctfdf2_libfunc;
388 extern rtx memcpy_libfunc;
389 extern rtx bcopy_libfunc;
390 extern rtx memcmp_libfunc;
391 extern rtx bcmp_libfunc;
392 extern rtx memset_libfunc;
393 extern rtx bzero_libfunc;
395 extern rtx throw_libfunc;
396 extern rtx sjthrow_libfunc;
397 extern rtx sjpopnthrow_libfunc;
398 extern rtx terminate_libfunc;
399 extern rtx setjmp_libfunc;
400 extern rtx longjmp_libfunc;
401 extern rtx get_dynamic_handler_chain_libfunc;
403 extern rtx eqhf2_libfunc;
404 extern rtx nehf2_libfunc;
405 extern rtx gthf2_libfunc;
406 extern rtx gehf2_libfunc;
407 extern rtx lthf2_libfunc;
408 extern rtx lehf2_libfunc;
410 extern rtx eqsf2_libfunc;
411 extern rtx nesf2_libfunc;
412 extern rtx gtsf2_libfunc;
413 extern rtx gesf2_libfunc;
414 extern rtx ltsf2_libfunc;
415 extern rtx lesf2_libfunc;
417 extern rtx eqdf2_libfunc;
418 extern rtx nedf2_libfunc;
419 extern rtx gtdf2_libfunc;
420 extern rtx gedf2_libfunc;
421 extern rtx ltdf2_libfunc;
422 extern rtx ledf2_libfunc;
424 extern rtx eqxf2_libfunc;
425 extern rtx nexf2_libfunc;
426 extern rtx gtxf2_libfunc;
427 extern rtx gexf2_libfunc;
428 extern rtx ltxf2_libfunc;
429 extern rtx lexf2_libfunc;
431 extern rtx eqtf2_libfunc;
432 extern rtx netf2_libfunc;
433 extern rtx gttf2_libfunc;
434 extern rtx getf2_libfunc;
435 extern rtx lttf2_libfunc;
436 extern rtx letf2_libfunc;
438 extern rtx floatsisf_libfunc;
439 extern rtx floatdisf_libfunc;
440 extern rtx floattisf_libfunc;
442 extern rtx floatsidf_libfunc;
443 extern rtx floatdidf_libfunc;
444 extern rtx floattidf_libfunc;
446 extern rtx floatsixf_libfunc;
447 extern rtx floatdixf_libfunc;
448 extern rtx floattixf_libfunc;
450 extern rtx floatsitf_libfunc;
451 extern rtx floatditf_libfunc;
452 extern rtx floattitf_libfunc;
454 extern rtx fixsfsi_libfunc;
455 extern rtx fixsfdi_libfunc;
456 extern rtx fixsfti_libfunc;
458 extern rtx fixdfsi_libfunc;
459 extern rtx fixdfdi_libfunc;
460 extern rtx fixdfti_libfunc;
462 extern rtx fixxfsi_libfunc;
463 extern rtx fixxfdi_libfunc;
464 extern rtx fixxfti_libfunc;
466 extern rtx fixtfsi_libfunc;
467 extern rtx fixtfdi_libfunc;
468 extern rtx fixtfti_libfunc;
470 extern rtx fixunssfsi_libfunc;
471 extern rtx fixunssfdi_libfunc;
472 extern rtx fixunssfti_libfunc;
474 extern rtx fixunsdfsi_libfunc;
475 extern rtx fixunsdfdi_libfunc;
476 extern rtx fixunsdfti_libfunc;
478 extern rtx fixunsxfsi_libfunc;
479 extern rtx fixunsxfdi_libfunc;
480 extern rtx fixunsxfti_libfunc;
482 extern rtx fixunstfsi_libfunc;
483 extern rtx fixunstfdi_libfunc;
484 extern rtx fixunstfti_libfunc;
486 typedef rtx (*rtxfun) ();
488 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
489 gives the gen_function to make a branch to test that condition. */
491 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
493 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
494 gives the insn code to make a store-condition insn
495 to test that condition. */
497 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
499 #ifdef HAVE_conditional_move
500 /* Indexed by the the machine mode, gives the insn code to make a conditional
503 extern enum insn_code movcc_gen_code[NUM_MACHINE_MODES];
506 /* This array records the insn_code of insns to perform block moves. */
507 extern enum insn_code movstr_optab[NUM_MACHINE_MODES];
509 /* This array records the insn_code of insns to perform block clears. */
510 extern enum insn_code clrstr_optab[NUM_MACHINE_MODES];
512 /* Define functions given in optabs.c. */
514 /* Expand a binary operation given optab and rtx operands. */
515 extern rtx expand_binop PROTO((enum machine_mode, optab, rtx, rtx, rtx,
516 int, enum optab_methods));
518 /* Expand a binary operation with both signed and unsigned forms. */
519 extern rtx sign_expand_binop PROTO((enum machine_mode, optab, optab, rtx,
520 rtx, rtx, int, enum optab_methods));
522 /* Generate code to perform an operation on two operands with two results. */
523 extern int expand_twoval_binop PROTO((optab, rtx, rtx, rtx, rtx, int));
525 /* Expand a unary arithmetic operation given optab rtx operand. */
526 extern rtx expand_unop PROTO((enum machine_mode, optab, rtx, rtx, int));
528 /* Expand the absolute value operation. */
529 extern rtx expand_abs PROTO((enum machine_mode, rtx, rtx, int, int));
531 /* Expand the complex absolute value operation. */
532 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
534 /* Generate an instruction with a given INSN_CODE with an output and
536 extern void emit_unop_insn PROTO((int, rtx, rtx, enum rtx_code));
538 /* Emit code to perform a series of operations on a multi-word quantity, one
540 extern rtx emit_no_conflict_block PROTO((rtx, rtx, rtx, rtx, rtx));
542 /* Emit code to make a call to a constant function or a library call. */
543 extern void emit_libcall_block PROTO((rtx, rtx, rtx, rtx));
545 /* Emit one rtl instruction to store zero in specified rtx. */
546 extern void emit_clr_insn PROTO((rtx));
548 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0. */
549 extern void emit_0_to_1_insn PROTO((rtx));
551 /* Emit one rtl insn to compare two rtx's. */
552 extern void emit_cmp_insn PROTO((rtx, rtx, enum rtx_code, rtx,
553 enum machine_mode, int, int));
555 /* Nonzero if a compare of mode MODE can be done straightforwardly
556 (without splitting it into pieces). */
557 extern int can_compare_p PROTO((enum machine_mode));
559 /* Emit a library call comparison between floating point X and Y.
560 COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.). */
561 extern void emit_float_lib_cmp PROTO((rtx, rtx, enum rtx_code));
563 /* Generate code to indirectly jump to a location given in the rtx LOC. */
564 extern void emit_indirect_jump PROTO((rtx));
566 #ifdef HAVE_conditional_move
567 /* Emit a conditional move operation. */
568 rtx emit_conditional_move PROTO((rtx, enum rtx_code, rtx, rtx,
569 enum machine_mode, rtx, rtx,
570 enum machine_mode, int));
572 /* Return non-zero if the conditional move is supported. */
573 int can_conditionally_move_p PROTO((enum machine_mode mode));
576 /* Create but don't emit one rtl instruction to add one rtx into another.
577 Modes must match; operands must meet the operation's predicates.
578 Likewise for subtraction and for just copying.
579 These do not call protect_from_queue; caller must do so. */
580 extern rtx gen_add2_insn PROTO((rtx, rtx));
581 extern rtx gen_sub2_insn PROTO((rtx, rtx));
582 extern rtx gen_move_insn PROTO((rtx, rtx));
583 extern int have_add2_insn PROTO((enum machine_mode));
584 extern int have_sub2_insn PROTO((enum machine_mode));
586 /* Return the INSN_CODE to use for an extend operation. */
587 extern enum insn_code can_extend_p PROTO((enum machine_mode,
588 enum machine_mode, int));
590 /* Generate the body of an insn to extend Y (with mode MFROM)
591 into X (with mode MTO). Do zero-extension if UNSIGNEDP is nonzero. */
592 extern rtx gen_extend_insn PROTO((rtx, rtx, enum machine_mode,
593 enum machine_mode, int));
595 /* Initialize the tables that control conversion between fixed and
597 extern void init_fixtab PROTO((void));
598 extern void init_floattab PROTO((void));
600 /* Generate code for a FLOAT_EXPR. */
601 extern void expand_float PROTO((rtx, rtx, int));
603 /* Generate code for a FIX_EXPR. */
604 extern void expand_fix PROTO((rtx, rtx, int));
606 /* Call this once to initialize the contents of the optabs
607 appropriately for the current target machine. */
608 extern void init_optabs PROTO((void));
610 /* Functions from expmed.c: */
612 /* Arguments MODE, RTX: return an rtx for the negation of that value.
614 extern rtx negate_rtx PROTO((enum machine_mode, rtx));
616 /* Expand a logical AND operation. */
617 extern rtx expand_and PROTO((rtx, rtx, rtx));
619 /* Emit a store-flag operation. */
620 extern rtx emit_store_flag PROTO((rtx, enum rtx_code, rtx, rtx,
621 enum machine_mode, int, int));
623 /* Like emit_store_flag, but always succeeds. */
624 extern rtx emit_store_flag_force PROTO((rtx, enum rtx_code, rtx, rtx,
625 enum machine_mode, int, int));
627 /* Functions from loop.c: */
629 /* Given a JUMP_INSN, return a description of the test being made. */
630 extern rtx get_condition PROTO((rtx, rtx *));
632 /* Functions from expr.c: */
634 /* This is run once per compilation to set up which modes can be used
635 directly in memory and to initialize the block move optab. */
636 extern void init_expr_once PROTO((void));
638 /* This is run at the start of compiling a function. */
639 extern void init_expr PROTO((void));
641 /* Use protect_from_queue to convert a QUEUED expression
642 into something that you can put immediately into an instruction. */
643 extern rtx protect_from_queue PROTO((rtx, int));
645 /* Perform all the pending incrementations. */
646 extern void emit_queue PROTO((void));
648 /* Emit some rtl insns to move data between rtx's, converting machine modes.
649 Both modes must be floating or both fixed. */
650 extern void convert_move PROTO((rtx, rtx, int));
652 /* Convert an rtx to specified machine mode and return the result. */
653 extern rtx convert_to_mode PROTO((enum machine_mode, rtx, int));
655 /* Convert an rtx to MODE from OLDMODE and return the result. */
656 extern rtx convert_modes PROTO((enum machine_mode, enum machine_mode, rtx, int));
658 /* Emit code to move a block Y to a block X. */
659 extern void emit_block_move PROTO((rtx, rtx, rtx, int));
661 /* Copy all or part of a value X into registers starting at REGNO.
662 The number of registers to be filled is NREGS. */
663 extern void move_block_to_reg PROTO((int, rtx, int, enum machine_mode));
665 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
666 The number of registers to be filled is NREGS. */
667 extern void move_block_from_reg PROTO((int, rtx, int, int));
669 /* Load a BLKmode value into non-consecutive registers represented by a
671 extern void emit_group_load PROTO((rtx, rtx));
672 /* Store a BLKmode value from non-consecutive registers represented by a
674 extern void emit_group_store PROTO((rtx, rtx));
676 /* Mark REG as holding a parameter for the next CALL_INSN. */
677 extern void use_reg PROTO((rtx *, rtx));
678 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
679 for the next CALL_INSN. */
680 extern void use_regs PROTO((rtx *, int, int));
681 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
682 extern void use_group_regs PROTO((rtx *, rtx));
684 /* Write zeros through the storage of OBJECT.
685 If OBJECT has BLKmode, SIZE is its length in bytes and ALIGN is its
687 extern void clear_storage PROTO((rtx, rtx, int));
689 /* Emit insns to set X from Y. */
690 extern rtx emit_move_insn PROTO((rtx, rtx));
692 /* Emit insns to set X from Y, with no frills. */
693 extern rtx emit_move_insn_1 PROTO ((rtx, rtx));
695 /* Push a block of length SIZE (perhaps variable)
696 and return an rtx to address the beginning of the block. */
697 extern rtx push_block PROTO((rtx, int, int));
699 /* Make an operand to push something on the stack. */
700 extern rtx gen_push_operand PROTO((void));
703 /* Generate code to push something onto the stack, given its mode and type. */
704 extern void emit_push_insn PROTO((rtx, enum machine_mode, tree, rtx, int,
705 int, rtx, int, rtx, rtx));
707 /* Emit library call. */
708 extern void emit_library_call PVPROTO((rtx orgfun, int no_queue,
709 enum machine_mode outmode, int nargs, ...));
710 extern rtx emit_library_call_value PVPROTO((rtx orgfun, rtx value, int no_queue,
711 enum machine_mode outmode, int nargs, ...));
713 /* Expand an assignment that stores the value of FROM into TO. */
714 extern rtx expand_assignment PROTO((tree, tree, int, int));
716 /* Generate code for computing expression EXP,
717 and storing the value into TARGET.
718 If SUGGEST_REG is nonzero, copy the value through a register
719 and return that register, if that is possible. */
720 extern rtx store_expr PROTO((tree, rtx, int));
723 /* Given an rtx that may include add and multiply operations,
724 generate them as insns and return a pseudo-reg containing the value.
725 Useful after calling expand_expr with 1 as sum_ok. */
726 extern rtx force_operand PROTO((rtx, rtx));
728 extern rtx expand_builtin_setjmp PROTO((rtx, rtx));
731 /* Generate code for computing expression EXP.
732 An rtx for the computed value is returned. The value is never null.
733 In the case of a void EXP, const0_rtx is returned. */
734 extern rtx expand_expr PROTO((tree, rtx, enum machine_mode,
735 enum expand_modifier));
738 /* At the start of a function, record that we have no previously-pushed
739 arguments waiting to be popped. */
740 extern void init_pending_stack_adjust PROTO((void));
742 /* When exiting from function, if safe, clear out any pending stack adjust
743 so the adjustment won't get done. */
744 extern void clear_pending_stack_adjust PROTO((void));
746 /* Pop any previously-pushed arguments that have not been popped yet. */
747 extern void do_pending_stack_adjust PROTO((void));
750 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
751 extern void jumpifnot PROTO((tree, rtx));
753 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
754 extern void jumpif PROTO((tree, rtx));
756 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
757 the result is zero, or IF_TRUE_LABEL if the result is one. */
758 extern void do_jump PROTO((tree, rtx, rtx));
761 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
762 extern rtx compare_from_rtx PROTO((rtx, rtx, enum rtx_code, int,
763 enum machine_mode, rtx, int));
765 /* Generate a tablejump instruction (used for switch statements). */
766 extern void do_tablejump PROTO((rtx, enum machine_mode, rtx, rtx, rtx));
769 /* rtl.h and tree.h were included. */
770 /* Return an rtx for the size in bytes of the value of an expr. */
771 extern rtx expr_size PROTO((tree));
773 extern rtx lookup_static_chain PROTO((tree));
775 /* Convert a stack slot address ADDR valid in function FNDECL
776 into an address valid in this function (using a static chain). */
777 extern rtx fix_lexical_addr PROTO((rtx, tree));
779 /* Return the address of the trampoline for entering nested fn FUNCTION. */
780 extern rtx trampoline_address PROTO((tree));
782 /* Return an rtx that refers to the value returned by a function
783 in its original home. This becomes invalid if any more code is emitted. */
784 extern rtx hard_function_value PROTO((tree, tree));
786 extern rtx prepare_call_address PROTO((rtx, tree, rtx *, int));
788 extern rtx expand_call PROTO((tree, rtx, int));
790 extern rtx expand_shift PROTO((enum tree_code, enum machine_mode, rtx, tree, rtx, int));
791 extern rtx expand_divmod PROTO((int, enum tree_code, enum machine_mode, rtx, rtx, rtx, int));
792 extern void locate_and_pad_parm PROTO((enum machine_mode, tree, int, tree, struct args_size *, struct args_size *, struct args_size *));
793 extern rtx expand_inline_function PROTO((tree, tree, rtx, int, tree, rtx));
794 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
795 extern rtx label_rtx PROTO((tree));
798 /* Indicate how an input argument register was promoted. */
799 extern rtx promoted_input_arg PROTO((int, enum machine_mode *, int *));
801 /* Return an rtx like arg but sans any constant terms.
802 Returns the original rtx if it has no constant terms.
803 The constant terms are added and stored via a second arg. */
804 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
806 /* Convert arg to a valid memory address for specified machine mode,
807 by emitting insns to perform arithmetic if nec. */
808 extern rtx memory_address PROTO((enum machine_mode, rtx));
810 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
811 extern rtx memory_address_noforce PROTO((enum machine_mode, rtx));
813 /* Return a memory reference like MEMREF, but with its mode changed
814 to MODE and its address changed to ADDR.
815 (VOIDmode means don't change the mode.
816 NULL for ADDR means don't change the address.) */
817 extern rtx change_address PROTO((rtx, enum machine_mode, rtx));
819 /* Return a memory reference like MEMREF, but which is known to have a
822 extern rtx validize_mem PROTO((rtx));
824 /* Assemble the static constant template for function entry trampolines. */
825 extern rtx assemble_trampoline_template PROTO((void));
827 /* Return 1 if two rtx's are equivalent in structure and elements. */
828 extern int rtx_equal_p PROTO((rtx, rtx));
830 /* Given rtx, return new rtx whose address won't be affected by
831 any side effects. It has been copied to a new temporary reg. */
832 extern rtx stabilize PROTO((rtx));
834 /* Given an rtx, copy all regs it refers to into new temps
835 and return a modified copy that refers to the new temps. */
836 extern rtx copy_all_regs PROTO((rtx));
838 /* Copy given rtx to a new temp reg and return that. */
839 extern rtx copy_to_reg PROTO((rtx));
841 /* Like copy_to_reg but always make the reg Pmode. */
842 extern rtx copy_addr_to_reg PROTO((rtx));
844 /* Like copy_to_reg but always make the reg the specified mode MODE. */
845 extern rtx copy_to_mode_reg PROTO((enum machine_mode, rtx));
847 /* Copy given rtx to given temp reg and return that. */
848 extern rtx copy_to_suggested_reg PROTO((rtx, rtx, enum machine_mode));
850 /* Copy a value to a register if it isn't already a register.
851 Args are mode (in case value is a constant) and the value. */
852 extern rtx force_reg PROTO((enum machine_mode, rtx));
854 /* Return given rtx, copied into a new temp reg if it was in memory. */
855 extern rtx force_not_mem PROTO((rtx));
858 /* Return mode and signedness to use when object is promoted. */
859 extern enum machine_mode promote_mode PROTO((tree, enum machine_mode,
863 /* Remove some bytes from the stack. An rtx says how many. */
864 extern void adjust_stack PROTO((rtx));
866 /* Add some bytes to the stack. An rtx says how many. */
867 extern void anti_adjust_stack PROTO((rtx));
869 /* This enum is used for the following two functions. */
870 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
872 /* Save the stack pointer at the specified level. */
873 extern void emit_stack_save PROTO((enum save_level, rtx *, rtx));
875 /* Restore the stack pointer from a save area of the specified level. */
876 extern void emit_stack_restore PROTO((enum save_level, rtx, rtx));
878 /* Allocate some space on the stack dynamically and return its address. An rtx
879 says how many bytes. */
880 extern rtx allocate_dynamic_stack_space PROTO((rtx, rtx, int));
882 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
883 FIRST is a constant and size is a Pmode RTX. These are offsets from the
884 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
885 subtract from the stack. If SIZE is constant, this is done
886 with a fixed number of probes. Otherwise, we must make a loop. */
887 extern void probe_stack_range PROTO((HOST_WIDE_INT, rtx));
889 /* Return an rtx that refers to the value returned by a library call
890 in its original home. This becomes invalid if any more code is emitted. */
891 extern rtx hard_libcall_value PROTO((enum machine_mode));
893 /* Given an rtx, return an rtx for a value rounded up to a multiple
894 of STACK_BOUNDARY / BITS_PER_UNIT. */
895 extern rtx round_push PROTO((rtx));
897 extern void emit_block_move PROTO((rtx, rtx, rtx, int));
899 extern rtx store_bit_field PROTO((rtx, int, int, enum machine_mode, rtx, int, int));
900 extern rtx extract_bit_field PROTO((rtx, int, int, int, rtx, enum machine_mode, enum machine_mode, int, int));
901 extern rtx expand_mult PROTO((enum machine_mode, rtx, rtx, rtx, int));
902 extern rtx expand_mult_add PROTO((rtx, rtx, rtx, rtx,enum machine_mode, int));
903 extern rtx expand_mult_highpart_adjust PROTO((enum machine_mode, rtx, rtx, rtx, rtx, int));
905 extern rtx assemble_static_space PROTO((int));
907 /* Hook called by expand_expr for language-specific tree codes.
908 It is up to the language front end to install a hook
909 if it has any such codes that expand_expr needs to know about. */
910 extern rtx (*lang_expand_expr) ();
913 /* Build bytecode call descriptor for function SUBR. */
914 extern rtx bc_build_calldesc PROTO((tree));
916 /* Emit a type code to be used by the runtime support in handling
917 parameter passing. The type code consists of the machine mode
918 plus the minimal alignment shifted left 8 bits. */
919 extern tree bc_runtime_type_code PROTO((tree));