1 /* Definitions for code generation pass of GNU compiler.
2 Copyright (C) 1987, 1991, 1992, 1993 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
27 /* The default branch cost is 1. */
32 /* The default is that we do not promote the mode of an object. */
34 #define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE)
37 /* Macros to access the slots of a QUEUED rtx.
38 Here rather than in rtl.h because only the expansion pass
39 should ever encounter a QUEUED. */
41 /* The variable for which an increment is queued. */
42 #define QUEUED_VAR(P) XEXP (P, 0)
43 /* If the increment has been emitted, this is the insn
44 that does the increment. It is zero before the increment is emitted. */
45 #define QUEUED_INSN(P) XEXP (P, 1)
46 /* If a pre-increment copy has been generated, this is the copy
47 (it is a temporary reg). Zero if no copy made yet. */
48 #define QUEUED_COPY(P) XEXP (P, 2)
49 /* This is the body to use for the insn to do the increment.
50 It is used to emit the increment. */
51 #define QUEUED_BODY(P) XEXP (P, 3)
52 /* Next QUEUED in the queue. */
53 #define QUEUED_NEXT(P) XEXP (P, 4)
55 /* This is the 4th arg to `expand_expr'.
56 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
57 EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
58 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
59 is a constant that is not a legitimate address. */
60 enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM,
61 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER};
63 /* List of labels that must never be deleted. */
64 extern rtx forced_labels;
66 /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
67 So we can mark them all live at the end of the function, if stupid. */
68 extern rtx save_expr_regs;
70 extern int current_function_calls_alloca;
71 extern int current_function_outgoing_args_size;
73 /* This is the offset from the arg pointer to the place where the first
74 anonymous arg can be found, if there is one. */
75 extern rtx current_function_arg_offset_rtx;
77 /* This is nonzero if the current function uses the constant pool. */
78 extern int current_function_uses_const_pool;
80 /* This is nonzero if the current function uses pic_offset_table_rtx. */
81 extern int current_function_uses_pic_offset_table;
83 /* The arg pointer hard register, or the pseudo into which it was copied. */
84 extern rtx current_function_internal_arg_pointer;
86 /* Nonzero means stack pops must not be deferred, and deferred stack
87 pops must not be output. It is nonzero inside a function call,
88 inside a conditional expression, inside a statement expression,
89 and in other cases as well. */
90 extern int inhibit_defer_pop;
92 /* Number of function calls seen so far in current function. */
94 extern int function_call_count;
96 /* RTX for stack slot that holds the current handler for nonlocal gotos.
97 Zero when function does not have nonlocal labels. */
99 extern rtx nonlocal_goto_handler_slot;
101 /* RTX for stack slot that holds the stack pointer value to restore
103 Zero when function does not have nonlocal labels. */
105 extern rtx nonlocal_goto_stack_level;
107 /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
108 (labels to which there can be nonlocal gotos from nested functions)
111 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
112 extern tree nonlocal_labels;
115 #define NO_DEFER_POP (inhibit_defer_pop += 1)
116 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
118 /* Number of units that we should eventually pop off the stack.
119 These are the arguments to function calls that have already returned. */
120 extern int pending_stack_adjust;
122 /* A list of all cleanups which belong to the arguments of
123 function calls being expanded by expand_call. */
124 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
125 extern tree cleanups_this_call;
128 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
129 /* Structure to record the size of a sequence of arguments
130 as the sum of a tree-expression and a constant. */
139 /* Add the value of the tree INC to the `struct args_size' TO. */
141 #define ADD_PARM_SIZE(TO, INC) \
142 { tree inc = (INC); \
143 if (TREE_CODE (inc) == INTEGER_CST) \
144 (TO).constant += TREE_INT_CST_LOW (inc); \
145 else if ((TO).var == 0) \
148 (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
150 #define SUB_PARM_SIZE(TO, DEC) \
151 { tree dec = (DEC); \
152 if (TREE_CODE (dec) == INTEGER_CST) \
153 (TO).constant -= TREE_INT_CST_LOW (dec); \
154 else if ((TO).var == 0) \
155 (TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
157 (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
159 /* Convert the implicit sum in a `struct args_size' into an rtx. */
160 #define ARGS_SIZE_RTX(SIZE) \
161 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
162 : expand_expr (size_binop (PLUS_EXPR, (SIZE).var, \
163 size_int ((SIZE).constant)), \
164 NULL_RTX, VOIDmode, 0))
166 /* Convert the implicit sum in a `struct args_size' into a tree. */
167 #define ARGS_SIZE_TREE(SIZE) \
168 ((SIZE).var == 0 ? size_int ((SIZE).constant) \
169 : size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
171 /* Supply a default definition for FUNCTION_ARG_PADDING:
172 usually pad upward, but pad short args downward on
173 big-endian machines. */
175 enum direction {none, upward, downward}; /* Value has this type. */
177 #ifndef FUNCTION_ARG_PADDING
179 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
180 (((MODE) == BLKmode \
181 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
182 && int_size_in_bytes (TYPE) < PARM_BOUNDARY / BITS_PER_UNIT) \
183 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
186 #define FUNCTION_ARG_PADDING(MODE, TYPE) upward
190 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
191 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
194 #ifndef FUNCTION_ARG_BOUNDARY
195 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
198 /* Nonzero if we do not know how to pass TYPE solely in registers.
199 We cannot do so in the following cases:
201 - if the type has variable size
202 - if the type is marked as addressable (it is required to be constructed
204 - if the padding and mode of the type is such that a copy into a register
205 would put it into the wrong part of the register.
207 Which padding can't be supported depends on the byte endianness.
209 A value in a register is implicitly padded at the most significant end.
210 On a big-endian machine, that is the lower end in memory.
211 So a value padded in memory at the upper end can't go in a register.
212 For a little-endian machine, the reverse is true. */
214 /* ??? Perhaps later rename this to FUNCTION_ARG_MUST_PASS_IN_STACK?
215 (although it is a little long). */
217 #ifndef MUST_PASS_IN_STACK
220 #define MUST_PASS_IN_STACK_BAD_PADDING upward
222 #define MUST_PASS_IN_STACK_BAD_PADDING downward
225 #define MUST_PASS_IN_STACK(MODE,TYPE) \
227 && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
228 || TREE_ADDRESSABLE (TYPE) \
229 || ((MODE) == BLKmode \
230 && (FUNCTION_ARG_PADDING (MODE, TYPE) \
231 == MUST_PASS_IN_STACK_BAD_PADDING))))
234 /* Nonzero if type TYPE should be returned in memory.
235 Most machines can use the following default definition. */
237 #ifndef RETURN_IN_MEMORY
238 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
241 /* Optabs are tables saying how to generate insn bodies
242 for various machine modes and numbers of operands.
243 Each optab applies to one operation.
244 For example, add_optab applies to addition.
246 The insn_code slot is the enum insn_code that says how to
247 generate an insn for this operation on a particular machine mode.
248 It is CODE_FOR_nothing if there is no such insn on the target machine.
250 The `lib_call' slot is the name of the library function that
251 can be used to perform the operation.
253 A few optabs, such as move_optab and cmp_optab, are used
256 /* Everything that uses expr.h needs to define enum insn_code
257 but we don't list it in the Makefile dependencies just for that. */
258 #include "insn-codes.h"
264 enum insn_code insn_code;
266 } handlers [NUM_MACHINE_MODES];
269 /* Given an enum insn_code, access the function to construct
270 the body of that kind of insn. */
271 #ifdef FUNCTION_CONVERSION_BUG
272 /* Some compilers fail to convert a function properly to a
273 pointer-to-function when used as an argument.
274 So produce the pointer-to-function directly.
275 Luckily, these compilers seem to work properly when you
276 call the pointer-to-function. */
277 #define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
279 #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
282 extern rtx (*const insn_gen_function[]) ();
284 extern optab add_optab;
285 extern optab sub_optab;
286 extern optab smul_optab; /* Signed and floating-point multiply */
287 extern optab smul_widen_optab; /* Signed multiply with result
288 one machine mode wider than args */
289 extern optab umul_widen_optab;
290 extern optab sdiv_optab; /* Signed divide */
291 extern optab sdivmod_optab; /* Signed divide-and-remainder in one */
292 extern optab udiv_optab;
293 extern optab udivmod_optab;
294 extern optab smod_optab; /* Signed remainder */
295 extern optab umod_optab;
296 extern optab flodiv_optab; /* Optab for floating divide. */
297 extern optab ftrunc_optab; /* Convert float to integer in float fmt */
298 extern optab and_optab; /* Logical and */
299 extern optab ior_optab; /* Logical or */
300 extern optab xor_optab; /* Logical xor */
301 extern optab ashl_optab; /* Arithmetic shift left */
302 extern optab ashr_optab; /* Arithmetic shift right */
303 extern optab lshl_optab; /* Logical shift left */
304 extern optab lshr_optab; /* Logical shift right */
305 extern optab rotl_optab; /* Rotate left */
306 extern optab rotr_optab; /* Rotate right */
307 extern optab smin_optab; /* Signed and floating-point minimum value */
308 extern optab smax_optab; /* Signed and floating-point maximum value */
309 extern optab umin_optab; /* Unsigned minimum value */
310 extern optab umax_optab; /* Unsigned maximum value */
312 extern optab mov_optab; /* Move instruction. */
313 extern optab movstrict_optab; /* Move, preserving high part of register. */
315 extern optab cmp_optab; /* Compare insn; two operands. */
316 extern optab tst_optab; /* tst insn; compare one operand against 0 */
318 /* Unary operations */
319 extern optab neg_optab; /* Negation */
320 extern optab abs_optab; /* Abs value */
321 extern optab one_cmpl_optab; /* Bitwise not */
322 extern optab ffs_optab; /* Find first bit set */
323 extern optab sqrt_optab; /* Square root */
324 extern optab sin_optab; /* Sine */
325 extern optab cos_optab; /* Cosine */
326 extern optab strlen_optab; /* String length */
328 /* Passed to expand_binop and expand_unop to say which options to try to use
329 if the requested operation can't be open-coded on the requisite mode.
330 Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
331 Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
332 OPTAB_MUST_WIDEN says try widening and don't try anything else. */
343 /* SYMBOL_REF rtx's for the library functions that are called
344 implicitly and not via optabs. */
346 extern rtx extendsfdf2_libfunc;
347 extern rtx extendsfxf2_libfunc;
348 extern rtx extendsftf2_libfunc;
349 extern rtx extenddfxf2_libfunc;
350 extern rtx extenddftf2_libfunc;
352 extern rtx truncdfsf2_libfunc;
353 extern rtx truncxfsf2_libfunc;
354 extern rtx trunctfsf2_libfunc;
355 extern rtx truncxfdf2_libfunc;
356 extern rtx trunctfdf2_libfunc;
358 extern rtx memcpy_libfunc;
359 extern rtx bcopy_libfunc;
360 extern rtx memcmp_libfunc;
361 extern rtx bcmp_libfunc;
362 extern rtx memset_libfunc;
363 extern rtx bzero_libfunc;
365 extern rtx eqsf2_libfunc;
366 extern rtx nesf2_libfunc;
367 extern rtx gtsf2_libfunc;
368 extern rtx gesf2_libfunc;
369 extern rtx ltsf2_libfunc;
370 extern rtx lesf2_libfunc;
372 extern rtx eqdf2_libfunc;
373 extern rtx nedf2_libfunc;
374 extern rtx gtdf2_libfunc;
375 extern rtx gedf2_libfunc;
376 extern rtx ltdf2_libfunc;
377 extern rtx ledf2_libfunc;
379 extern rtx eqxf2_libfunc;
380 extern rtx nexf2_libfunc;
381 extern rtx gtxf2_libfunc;
382 extern rtx gexf2_libfunc;
383 extern rtx ltxf2_libfunc;
384 extern rtx lexf2_libfunc;
386 extern rtx eqtf2_libfunc;
387 extern rtx netf2_libfunc;
388 extern rtx gttf2_libfunc;
389 extern rtx getf2_libfunc;
390 extern rtx lttf2_libfunc;
391 extern rtx letf2_libfunc;
393 extern rtx floatsisf_libfunc;
394 extern rtx floatdisf_libfunc;
395 extern rtx floattisf_libfunc;
397 extern rtx floatsidf_libfunc;
398 extern rtx floatdidf_libfunc;
399 extern rtx floattidf_libfunc;
401 extern rtx floatsixf_libfunc;
402 extern rtx floatdixf_libfunc;
403 extern rtx floattixf_libfunc;
405 extern rtx floatsitf_libfunc;
406 extern rtx floatditf_libfunc;
407 extern rtx floattitf_libfunc;
409 extern rtx fixsfsi_libfunc;
410 extern rtx fixsfdi_libfunc;
411 extern rtx fixsfti_libfunc;
413 extern rtx fixdfsi_libfunc;
414 extern rtx fixdfdi_libfunc;
415 extern rtx fixdfti_libfunc;
417 extern rtx fixxfsi_libfunc;
418 extern rtx fixxfdi_libfunc;
419 extern rtx fixxfti_libfunc;
421 extern rtx fixtfsi_libfunc;
422 extern rtx fixtfdi_libfunc;
423 extern rtx fixtfti_libfunc;
425 extern rtx fixunssfsi_libfunc;
426 extern rtx fixunssfdi_libfunc;
427 extern rtx fixunssfti_libfunc;
429 extern rtx fixunsdfsi_libfunc;
430 extern rtx fixunsdfdi_libfunc;
431 extern rtx fixunsdfti_libfunc;
433 extern rtx fixunsxfsi_libfunc;
434 extern rtx fixunsxfdi_libfunc;
435 extern rtx fixunsxfti_libfunc;
437 extern rtx fixunstfsi_libfunc;
438 extern rtx fixunstfdi_libfunc;
439 extern rtx fixunstfti_libfunc;
441 typedef rtx (*rtxfun) ();
443 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
444 gives the gen_function to make a branch to test that condition. */
446 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
448 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
449 gives the insn code to make a store-condition insn
450 to test that condition. */
452 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
454 /* Define functions given in optabs.c. */
456 /* Expand a binary operation given optab and rtx operands. */
457 extern rtx expand_binop PROTO((enum machine_mode, optab, rtx, rtx, rtx,
458 int, enum optab_methods));
460 /* Expand a binary operation with both signed and unsigned forms. */
461 extern rtx sign_expand_binop PROTO((enum machine_mode, optab, optab, rtx,
462 rtx, rtx, int, enum optab_methods));
464 /* Generate code to perform an operation on two operands with two results. */
465 extern int expand_twoval_binop PROTO((optab, rtx, rtx, rtx, rtx, int));
467 /* Expand a unary arithmetic operation given optab rtx operand. */
468 extern rtx expand_unop PROTO((enum machine_mode, optab, rtx, rtx, int));
470 /* Expand the complex absolute value operation. */
471 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
473 /* Generate an instruction with a given INSN_CODE with an output and
475 extern void emit_unop_insn PROTO((int, rtx, rtx, enum rtx_code));
477 /* Emit code to perform a series of operations on a multi-word quantity, one
479 extern rtx emit_no_conflict_block PROTO((rtx, rtx, rtx, rtx, rtx));
481 /* Emit code to make a call to a constant function or a library call. */
482 extern void emit_libcall_block PROTO((rtx, rtx, rtx, rtx));
484 /* Emit one rtl instruction to store zero in specified rtx. */
485 extern void emit_clr_insn PROTO((rtx));
487 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0. */
488 extern void emit_0_to_1_insn PROTO((rtx));
490 /* Emit one rtl insn to compare two rtx's. */
491 extern void emit_cmp_insn PROTO((rtx, rtx, enum rtx_code, rtx,
492 enum machine_mode, int, int));
494 /* Nonzero if a compare of mode MODE can be done straightforwardly
495 (without splitting it into pieces). */
496 extern int can_compare_p PROTO((enum machine_mode));
498 /* Generate code to indirectly jump to a location given in the rtx LOC. */
499 extern void emit_indirect_jump PROTO((rtx));
501 /* Create but don't emit one rtl instruction to add one rtx into another.
502 Modes must match; operands must meet the operation's predicates.
503 Likewise for subtraction and for just copying.
504 These do not call protect_from_queue; caller must do so. */
505 extern rtx gen_add2_insn PROTO((rtx, rtx));
506 extern rtx gen_sub2_insn PROTO((rtx, rtx));
507 extern rtx gen_move_insn PROTO((rtx, rtx));
508 extern int have_add2_insn PROTO((enum machine_mode));
509 extern int have_sub2_insn PROTO((enum machine_mode));
511 /* Return the INSN_CODE to use for an extend operation. */
512 extern enum insn_code can_extend_p PROTO((enum machine_mode,
513 enum machine_mode, int));
515 /* Generate the body of an insn to extend Y (with mode MFROM)
516 into X (with mode MTO). Do zero-extension if UNSIGNEDP is nonzero. */
517 extern rtx gen_extend_insn PROTO((rtx, rtx, enum machine_mode,
518 enum machine_mode, int));
520 /* Initialize the tables that control conversion between fixed and
522 extern void init_fixtab PROTO((void));
523 extern void init_floattab PROTO((void));
525 /* Generate code for a FLOAT_EXPR. */
526 extern void expand_float PROTO((rtx, rtx, int));
528 /* Generate code for a FIX_EXPR. */
529 extern void expand_fix PROTO((rtx, rtx, int));
531 /* Call this once to initialize the contents of the optabs
532 appropriately for the current target machine. */
533 extern void init_optabs PROTO((void));
535 /* Functions from expmed.c: (/
537 /* Arguments MODE, RTX: return an rtx for the negation of that value.
539 extern rtx negate_rtx PROTO((enum machine_mode, rtx));
541 /* Expand a logical AND operation. */
542 extern rtx expand_and PROTO((rtx, rtx, rtx));
544 /* Emit a store-flag operation. */
545 extern rtx emit_store_flag PROTO((rtx, enum rtx_code, rtx, rtx,
546 enum machine_mode, int, int));
548 /* Functions from loop.c: */
550 /* Given a JUMP_INSN, return a description of the test being made. */
551 extern rtx get_condition PROTO((rtx, rtx *));
553 /* Functions from expr.c: */
555 /* This is run once per compilation to set up which modes can be used
556 directly in memory and to initialize the block move optab. */
557 extern void init_expr_once PROTO((void));
559 /* This is run at the start of compiling a function. */
560 extern void init_expr PROTO((void));
562 /* Use protect_from_queue to convert a QUEUED expression
563 into something that you can put immediately into an instruction. */
564 extern rtx protect_from_queue PROTO((rtx, int));
566 /* Perform all the pending incrementations. */
567 extern void emit_queue PROTO((void));
569 /* Emit some rtl insns to move data between rtx's, converting machine modes.
570 Both modes must be floating or both fixed. */
571 extern void convert_move PROTO((rtx, rtx, int));
573 /* Convert an rtx to specified machine mode and return the result. */
574 extern rtx convert_to_mode PROTO((enum machine_mode, rtx, int));
576 /* Emit code to move a block Y to a block X.
577 extern void emit_block_move PROTO((rtx, rtx, rtx, int));
579 /* Copy all or part of a value X into registers starting at REGNO.
580 The number of registers to be filled is NREGS. */
581 extern void move_block_to_reg PROTO((int, rtx, int, enum machine_mode));
583 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
584 The number of registers to be filled is NREGS. */
585 extern void move_block_from_reg PROTO((int, rtx, int));
587 /* Mark NREGS consecutive regs, starting at REGNO, as being live now. */
588 extern void use_regs PROTO((int, int));
590 /* Write zeros through the storage of OBJECT.
591 If OBJECT has BLKmode, SIZE is its length in bytes. */
592 extern void clear_storage PROTO((rtx, int));
594 /* Emit insns to set X from Y. */
595 extern rtx emit_move_insn PROTO((rtx, rtx));
597 /* Emit insns to set X from Y, with no frills. */
598 extern rtx emit_move_insn_1 PROTO ((rtx, rtx));
600 /* Push a block of length SIZE (perhaps variable)
601 and return an rtx to address the beginning of the block. */
602 extern rtx push_block PROTO((rtx, int, int));
604 /* Make an operand to push someting on the stack. */
605 extern rtx gen_push_operand PROTO((void));
608 /* Generate code to push something onto the stack, given its mode and type. */
609 extern void emit_push_insn PROTO((rtx, enum machine_mode, tree, rtx, int,
610 int, rtx, int, rtx, rtx));
612 /* Emit library call. These cannot have accurate prototypes since they have
613 a variable number of args. */
614 extern void emit_library_call ();
615 extern void emit_library_call_value ();
617 /* Expand an assignment that stores the value of FROM into TO. */
618 extern rtx expand_assignment PROTO((tree, tree, int, int));
620 /* Generate code for computing expression EXP,
621 and storing the value into TARGET.
622 If SUGGEST_REG is nonzero, copy the value through a register
623 and return that register, if that is possible. */
624 extern rtx store_expr PROTO((tree, rtx, int));
627 /* Given an rtx that may include add and multiply operations,
628 generate them as insns and return a pseudo-reg containing the value.
629 Useful after calling expand_expr with 1 as sum_ok. */
630 extern rtx force_operand PROTO((rtx, rtx));
633 /* Generate code for computing expression EXP.
634 An rtx for the computed value is returned. The value is never null.
635 In the case of a void EXP, const0_rtx is returned. */
636 extern rtx expand_expr PROTO((tree, rtx, enum machine_mode,
637 enum expand_modifier));
640 /* At the start of a function, record that we have no previously-pushed
641 arguments waiting to be popped. */
642 extern void init_pending_stack_adjust PROTO((void));
644 /* When exiting from function, if safe, clear out any pending stack adjust
645 so the adjustment won't get done. */
646 extern void clear_pending_stack_adjust PROTO((void));
648 /* Pop any previously-pushed arguments that have not been popped yet. */
649 extern void do_pending_stack_adjust PROTO((void));
652 /* Expand all cleanups up to OLD_CLEANUPS. */
653 extern void expand_cleanups_to PROTO((tree));
655 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
656 extern void jumpifnot PROTO((tree, rtx));
658 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
659 extern void jumpif PROTO((tree, rtx));
661 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
662 the result is zero, or IF_TRUE_LABEL if the result is one. */
663 extern void do_jump PROTO((tree, rtx, rtx));
666 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
667 extern rtx compare_from_rtx PROTO((rtx, rtx, enum rtx_code, int,
668 enum machine_mode, rtx, int));
670 /* Generate a tablejump instruction (used for switch statements). */
671 extern void do_tablejump PROTO((rtx, enum machine_mode, rtx, rtx, rtx));
674 /* rtl.h and tree.h were included. */
675 /* Return an rtx for the size in bytes of the value of an expr. */
676 extern rtx expr_size PROTO((tree));
678 extern rtx lookup_static_chain PROTO((tree));
680 /* Convert a stack slot address ADDR valid in function FNDECL
681 into an address valid in this function (using a static chain). */
682 extern rtx fix_lexical_addr PROTO((rtx, tree));
684 /* Return the address of the trampoline for entering nested fn FUNCTION. */
685 extern rtx trampoline_address PROTO((tree));
687 /* Return an rtx that refers to the value returned by a function
688 in its original home. This becomes invalid if any more code is emitted. */
689 extern rtx hard_function_value PROTO((tree, tree));
692 extern rtx prepare_call_address PROTO((rtx, tree, rtx*));
694 extern rtx expand_call PROTO((tree, rtx, int));
695 extern void emit_call_1 PROTO((rtx, tree, int, int, rtx, rtx, int, rtx, int));
697 extern rtx expand_shift PROTO((enum tree_code, enum machine_mode, rtx, tree, rtx, int));
698 extern rtx expand_divmod PROTO((int, enum tree_code, enum machine_mode, rtx, rtx, rtx, int));
699 extern void locate_and_pad_parm PROTO((enum machine_mode, tree, int, tree, struct args_size *, struct args_size *, struct args_size *));
700 extern rtx expand_inline_function PROTO((tree, tree, rtx, int, tree, rtx));
701 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
702 extern rtx label_rtx PROTO((tree));
704 /* Return an rtx for the size in bytes of the value of an expr. */
705 extern rtx expr_size ();
707 extern rtx lookup_static_chain ();
709 /* Convert a stack slot address ADDR valid in function FNDECL
710 into an address valid in this function (using a static chain). */
711 extern rtx fix_lexical_addr ();
713 /* Return the address of the trampoline for entering nested fn FUNCTION. */
714 extern rtx trampoline_address ();
716 /* Return an rtx that refers to the value returned by a function
717 in its original home. This becomes invalid if any more code is emitted. */
718 extern rtx hard_function_value ();
720 extern rtx prepare_call_address ();
721 extern rtx expand_call ();
722 extern void emit_call_1 ();
723 extern rtx expand_shift ();
724 extern rtx expand_divmod ();
725 extern void locate_and_pad_parm ();
726 extern rtx expand_inline_function ();
728 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
729 extern rtx label_rtx ();
732 /* Indicate how an input argument register was promoted. */
733 extern rtx promoted_input_arg ();
735 /* Return an rtx like arg but sans any constant terms.
736 Returns the original rtx if it has no constant terms.
737 The constant terms are added and stored via a second arg. */
738 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
740 /* Convert arg to a valid memory address for specified machine mode,
741 by emitting insns to perform arithmetic if nec. */
742 extern rtx memory_address PROTO((enum machine_mode, rtx));
744 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
745 extern rtx memory_address_noforce PROTO((enum machine_mode, rtx));
747 /* Return a memory reference like MEMREF, but with its mode changed
748 to MODE and its address changed to ADDR.
749 (VOIDmode means don't change the mode.
750 NULL for ADDR means don't change the address.) */
751 extern rtx change_address PROTO((rtx, enum machine_mode, rtx));
753 /* Return a memory reference like MEMREF, but which is known to have a
756 extern rtx validize_mem PROTO((rtx));
758 /* Convert a stack slot address ADDR valid in function FNDECL
759 into an address valid in this function (using a static chain). */
760 extern rtx fix_lexical_addr ();
762 /* Assemble the static constant template for function entry trampolines. */
763 extern rtx assemble_trampoline_template PROTO((void));
765 /* Return 1 if two rtx's are equivalent in structure and elements. */
766 extern int rtx_equal_p PROTO((rtx, rtx));
768 /* Given rtx, return new rtx whose address won't be affected by
769 any side effects. It has been copied to a new temporary reg. */
770 extern rtx stabilize PROTO((rtx));
772 /* Given an rtx, copy all regs it refers to into new temps
773 and return a modified copy that refers to the new temps. */
774 extern rtx copy_all_regs PROTO((rtx));
776 /* Copy given rtx to a new temp reg and return that. */
777 extern rtx copy_to_reg PROTO((rtx));
779 /* Like copy_to_reg but always make the reg Pmode. */
780 extern rtx copy_addr_to_reg PROTO((rtx));
782 /* Like copy_to_reg but always make the reg the specified mode MODE. */
783 extern rtx copy_to_mode_reg PROTO((enum machine_mode, rtx));
785 /* Copy given rtx to given temp reg and return that. */
786 extern rtx copy_to_suggested_reg PROTO((rtx, rtx, enum machine_mode));
788 /* Copy a value to a register if it isn't already a register.
789 Args are mode (in case value is a constant) and the value. */
790 extern rtx force_reg PROTO((enum machine_mode, rtx));
792 /* Return given rtx, copied into a new temp reg if it was in memory. */
793 extern rtx force_not_mem PROTO((rtx));
795 /* Remove some bytes from the stack. An rtx says how many. */
796 extern void adjust_stack PROTO((rtx));
798 /* Add some bytes to the stack. An rtx says how many. */
799 extern void anti_adjust_stack PROTO((rtx));
801 /* This enum is used for the following two functions. */
802 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
804 /* Save the stack pointer at the specified level. */
805 extern void emit_stack_save PROTO((enum save_level, rtx *, rtx));
807 /* Restore the stack pointer from a save area of the specified level. */
808 extern void emit_stack_restore PROTO((enum save_level, rtx, rtx));
810 /* Allocate some space on the stack dynamically and return its address. An rtx
811 says how many bytes. */
812 extern rtx allocate_dynamic_stack_space PROTO((rtx, rtx, int));
814 /* Emit code to copy function value to a new temp reg and return that reg. */
815 extern rtx function_value ();
817 /* Return an rtx that refers to the value returned by a library call
818 in its original home. This becomes invalid if any more code is emitted. */
819 extern rtx hard_libcall_value PROTO((enum machine_mode));
821 /* Emit code to copy function value to a specified place. */
822 extern void copy_function_value ();
824 /* Given an rtx, return an rtx for a value rounded up to a multiple
825 of STACK_BOUNDARY / BITS_PER_UNIT. */
826 extern rtx round_push PROTO((rtx));
828 extern void emit_block_move PROTO((rtx, rtx, rtx, int));
830 extern rtx store_bit_field PROTO((rtx, int, int, enum machine_mode, rtx, int, int));
831 extern rtx extract_bit_field PROTO((rtx, int, int, int, rtx, enum machine_mode, enum machine_mode, int, int));
832 extern rtx expand_mult PROTO((enum machine_mode, rtx, rtx, rtx, int));
833 extern rtx expand_mult_add PROTO((rtx, rtx, rtx, rtx,enum machine_mode, int));
834 extern rtx expand_stmt_expr ();
836 extern rtx assemble_static_space PROTO((int));
838 /* Hook called by expand_expr for language-specific tree codes.
839 It is up to the language front end to install a hook
840 if it has any such codes that expand_expr needs to know about. */
841 extern rtx (*lang_expand_expr) ();