1 /* Definitions for code generation pass of GNU compiler.
2 Copyright (C) 1987, 1991, 1992, 1993, 1994 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 /* Macros to access the slots of a QUEUED rtx.
33 Here rather than in rtl.h because only the expansion pass
34 should ever encounter a QUEUED. */
36 /* The variable for which an increment is queued. */
37 #define QUEUED_VAR(P) XEXP (P, 0)
38 /* If the increment has been emitted, this is the insn
39 that does the increment. It is zero before the increment is emitted. */
40 #define QUEUED_INSN(P) XEXP (P, 1)
41 /* If a pre-increment copy has been generated, this is the copy
42 (it is a temporary reg). Zero if no copy made yet. */
43 #define QUEUED_COPY(P) XEXP (P, 2)
44 /* This is the body to use for the insn to do the increment.
45 It is used to emit the increment. */
46 #define QUEUED_BODY(P) XEXP (P, 3)
47 /* Next QUEUED in the queue. */
48 #define QUEUED_NEXT(P) XEXP (P, 4)
50 /* This is the 4th arg to `expand_expr'.
51 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
52 EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
53 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
54 is a constant that is not a legitimate address. */
55 enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM,
56 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER};
58 /* List of labels that must never be deleted. */
59 extern rtx forced_labels;
61 /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
62 So we can mark them all live at the end of the function, if stupid. */
63 extern rtx save_expr_regs;
65 extern int current_function_calls_alloca;
66 extern int current_function_outgoing_args_size;
68 /* This is the offset from the arg pointer to the place where the first
69 anonymous arg can be found, if there is one. */
70 extern rtx current_function_arg_offset_rtx;
72 /* This is nonzero if the current function uses the constant pool. */
73 extern int current_function_uses_const_pool;
75 /* This is nonzero if the current function uses pic_offset_table_rtx. */
76 extern int current_function_uses_pic_offset_table;
78 /* The arg pointer hard register, or the pseudo into which it was copied. */
79 extern rtx current_function_internal_arg_pointer;
81 /* Nonzero means stack pops must not be deferred, and deferred stack
82 pops must not be output. It is nonzero inside a function call,
83 inside a conditional expression, inside a statement expression,
84 and in other cases as well. */
85 extern int inhibit_defer_pop;
87 /* Number of function calls seen so far in current function. */
89 extern int function_call_count;
91 /* RTX for stack slot that holds the current handler for nonlocal gotos.
92 Zero when function does not have nonlocal labels. */
94 extern rtx nonlocal_goto_handler_slot;
96 /* RTX for stack slot that holds the stack pointer value to restore
98 Zero when function does not have nonlocal labels. */
100 extern rtx nonlocal_goto_stack_level;
102 /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
103 (labels to which there can be nonlocal gotos from nested functions)
106 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
107 extern tree nonlocal_labels;
110 #define NO_DEFER_POP (inhibit_defer_pop += 1)
111 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
113 /* Number of units that we should eventually pop off the stack.
114 These are the arguments to function calls that have already returned. */
115 extern int pending_stack_adjust;
117 /* A list of all cleanups which belong to the arguments of
118 function calls being expanded by expand_call. */
119 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
120 extern tree cleanups_this_call;
123 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
124 /* Structure to record the size of a sequence of arguments
125 as the sum of a tree-expression and a constant. */
134 /* Add the value of the tree INC to the `struct args_size' TO. */
136 #define ADD_PARM_SIZE(TO, INC) \
137 { tree inc = (INC); \
138 if (TREE_CODE (inc) == INTEGER_CST) \
139 (TO).constant += TREE_INT_CST_LOW (inc); \
140 else if ((TO).var == 0) \
143 (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
145 #define SUB_PARM_SIZE(TO, DEC) \
146 { tree dec = (DEC); \
147 if (TREE_CODE (dec) == INTEGER_CST) \
148 (TO).constant -= TREE_INT_CST_LOW (dec); \
149 else if ((TO).var == 0) \
150 (TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
152 (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
154 /* Convert the implicit sum in a `struct args_size' into an rtx. */
155 #define ARGS_SIZE_RTX(SIZE) \
156 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
157 : expand_expr (size_binop (PLUS_EXPR, (SIZE).var, \
158 size_int ((SIZE).constant)), \
159 NULL_RTX, VOIDmode, 0))
161 /* Convert the implicit sum in a `struct args_size' into a tree. */
162 #define ARGS_SIZE_TREE(SIZE) \
163 ((SIZE).var == 0 ? size_int ((SIZE).constant) \
164 : size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
166 /* Supply a default definition for FUNCTION_ARG_PADDING:
167 usually pad upward, but pad short args downward on
168 big-endian machines. */
170 enum direction {none, upward, downward}; /* Value has this type. */
172 #ifndef FUNCTION_ARG_PADDING
174 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
175 (((MODE) == BLKmode \
176 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
177 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
178 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
181 #define FUNCTION_ARG_PADDING(MODE, TYPE) upward
185 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
186 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
189 #ifndef FUNCTION_ARG_BOUNDARY
190 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
193 /* Nonzero if we do not know how to pass TYPE solely in registers.
194 We cannot do so in the following cases:
196 - if the type has variable size
197 - if the type is marked as addressable (it is required to be constructed
199 - if the padding and mode of the type is such that a copy into a register
200 would put it into the wrong part of the register.
202 Which padding can't be supported depends on the byte endianness.
204 A value in a register is implicitly padded at the most significant end.
205 On a big-endian machine, that is the lower end in memory.
206 So a value padded in memory at the upper end can't go in a register.
207 For a little-endian machine, the reverse is true. */
210 #define MUST_PASS_IN_STACK_BAD_PADDING upward
212 #define MUST_PASS_IN_STACK_BAD_PADDING downward
215 #define MUST_PASS_IN_STACK(MODE,TYPE) \
217 && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
218 || TREE_ADDRESSABLE (TYPE) \
219 || ((MODE) == BLKmode \
220 && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
221 && 0 == (int_size_in_bytes (TYPE) \
222 % (PARM_BOUNDARY / BITS_PER_UNIT))) \
223 && (FUNCTION_ARG_PADDING (MODE, TYPE) \
224 == MUST_PASS_IN_STACK_BAD_PADDING))))
226 /* Nonzero if type TYPE should be returned in memory.
227 Most machines can use the following default definition. */
229 #ifndef RETURN_IN_MEMORY
230 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
233 /* Optabs are tables saying how to generate insn bodies
234 for various machine modes and numbers of operands.
235 Each optab applies to one operation.
236 For example, add_optab applies to addition.
238 The insn_code slot is the enum insn_code that says how to
239 generate an insn for this operation on a particular machine mode.
240 It is CODE_FOR_nothing if there is no such insn on the target machine.
242 The `lib_call' slot is the name of the library function that
243 can be used to perform the operation.
245 A few optabs, such as move_optab and cmp_optab, are used
248 /* Everything that uses expr.h needs to define enum insn_code
249 but we don't list it in the Makefile dependencies just for that. */
250 #include "insn-codes.h"
256 enum insn_code insn_code;
258 } handlers [NUM_MACHINE_MODES];
261 /* Given an enum insn_code, access the function to construct
262 the body of that kind of insn. */
263 #ifdef FUNCTION_CONVERSION_BUG
264 /* Some compilers fail to convert a function properly to a
265 pointer-to-function when used as an argument.
266 So produce the pointer-to-function directly.
267 Luckily, these compilers seem to work properly when you
268 call the pointer-to-function. */
269 #define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
271 #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
274 extern rtx (*const insn_gen_function[]) ();
276 extern optab add_optab;
277 extern optab sub_optab;
278 extern optab smul_optab; /* Signed and floating-point multiply */
279 extern optab smul_widen_optab; /* Signed multiply with result
280 one machine mode wider than args */
281 extern optab umul_widen_optab;
282 extern optab sdiv_optab; /* Signed divide */
283 extern optab sdivmod_optab; /* Signed divide-and-remainder in one */
284 extern optab udiv_optab;
285 extern optab udivmod_optab;
286 extern optab smod_optab; /* Signed remainder */
287 extern optab umod_optab;
288 extern optab flodiv_optab; /* Optab for floating divide. */
289 extern optab ftrunc_optab; /* Convert float to integer in float fmt */
290 extern optab and_optab; /* Logical and */
291 extern optab ior_optab; /* Logical or */
292 extern optab xor_optab; /* Logical xor */
293 extern optab ashl_optab; /* Arithmetic shift left */
294 extern optab ashr_optab; /* Arithmetic shift right */
295 extern optab lshr_optab; /* Logical shift right */
296 extern optab rotl_optab; /* Rotate left */
297 extern optab rotr_optab; /* Rotate right */
298 extern optab smin_optab; /* Signed and floating-point minimum value */
299 extern optab smax_optab; /* Signed and floating-point maximum value */
300 extern optab umin_optab; /* Unsigned minimum value */
301 extern optab umax_optab; /* Unsigned maximum value */
303 extern optab mov_optab; /* Move instruction. */
304 extern optab movstrict_optab; /* Move, preserving high part of register. */
306 extern optab cmp_optab; /* Compare insn; two operands. */
307 extern optab tst_optab; /* tst insn; compare one operand against 0 */
309 /* Unary operations */
310 extern optab neg_optab; /* Negation */
311 extern optab abs_optab; /* Abs value */
312 extern optab one_cmpl_optab; /* Bitwise not */
313 extern optab ffs_optab; /* Find first bit set */
314 extern optab sqrt_optab; /* Square root */
315 extern optab sin_optab; /* Sine */
316 extern optab cos_optab; /* Cosine */
317 extern optab strlen_optab; /* String length */
319 /* Tables of patterns for extending one integer mode to another. */
320 extern enum insn_code extendtab[MAX_MACHINE_MODE][MAX_MACHINE_MODE][2];
322 /* Tables of patterns for converting between fixed and floating point. */
323 extern enum insn_code fixtab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
324 extern enum insn_code fixtrunctab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
325 extern enum insn_code floattab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
327 /* Contains the optab used for each rtx code. */
328 extern optab code_to_optab[NUM_RTX_CODE + 1];
330 /* Passed to expand_binop and expand_unop to say which options to try to use
331 if the requested operation can't be open-coded on the requisite mode.
332 Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
333 Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
334 OPTAB_MUST_WIDEN says try widening and don't try anything else. */
345 /* SYMBOL_REF rtx's for the library functions that are called
346 implicitly and not via optabs. */
348 extern rtx extendsfdf2_libfunc;
349 extern rtx extendsfxf2_libfunc;
350 extern rtx extendsftf2_libfunc;
351 extern rtx extenddfxf2_libfunc;
352 extern rtx extenddftf2_libfunc;
354 extern rtx truncdfsf2_libfunc;
355 extern rtx truncxfsf2_libfunc;
356 extern rtx trunctfsf2_libfunc;
357 extern rtx truncxfdf2_libfunc;
358 extern rtx trunctfdf2_libfunc;
360 extern rtx memcpy_libfunc;
361 extern rtx bcopy_libfunc;
362 extern rtx memcmp_libfunc;
363 extern rtx bcmp_libfunc;
364 extern rtx memset_libfunc;
365 extern rtx bzero_libfunc;
367 extern rtx eqsf2_libfunc;
368 extern rtx nesf2_libfunc;
369 extern rtx gtsf2_libfunc;
370 extern rtx gesf2_libfunc;
371 extern rtx ltsf2_libfunc;
372 extern rtx lesf2_libfunc;
374 extern rtx eqdf2_libfunc;
375 extern rtx nedf2_libfunc;
376 extern rtx gtdf2_libfunc;
377 extern rtx gedf2_libfunc;
378 extern rtx ltdf2_libfunc;
379 extern rtx ledf2_libfunc;
381 extern rtx eqxf2_libfunc;
382 extern rtx nexf2_libfunc;
383 extern rtx gtxf2_libfunc;
384 extern rtx gexf2_libfunc;
385 extern rtx ltxf2_libfunc;
386 extern rtx lexf2_libfunc;
388 extern rtx eqtf2_libfunc;
389 extern rtx netf2_libfunc;
390 extern rtx gttf2_libfunc;
391 extern rtx getf2_libfunc;
392 extern rtx lttf2_libfunc;
393 extern rtx letf2_libfunc;
395 extern rtx floatsisf_libfunc;
396 extern rtx floatdisf_libfunc;
397 extern rtx floattisf_libfunc;
399 extern rtx floatsidf_libfunc;
400 extern rtx floatdidf_libfunc;
401 extern rtx floattidf_libfunc;
403 extern rtx floatsixf_libfunc;
404 extern rtx floatdixf_libfunc;
405 extern rtx floattixf_libfunc;
407 extern rtx floatsitf_libfunc;
408 extern rtx floatditf_libfunc;
409 extern rtx floattitf_libfunc;
411 extern rtx fixsfsi_libfunc;
412 extern rtx fixsfdi_libfunc;
413 extern rtx fixsfti_libfunc;
415 extern rtx fixdfsi_libfunc;
416 extern rtx fixdfdi_libfunc;
417 extern rtx fixdfti_libfunc;
419 extern rtx fixxfsi_libfunc;
420 extern rtx fixxfdi_libfunc;
421 extern rtx fixxfti_libfunc;
423 extern rtx fixtfsi_libfunc;
424 extern rtx fixtfdi_libfunc;
425 extern rtx fixtfti_libfunc;
427 extern rtx fixunssfsi_libfunc;
428 extern rtx fixunssfdi_libfunc;
429 extern rtx fixunssfti_libfunc;
431 extern rtx fixunsdfsi_libfunc;
432 extern rtx fixunsdfdi_libfunc;
433 extern rtx fixunsdfti_libfunc;
435 extern rtx fixunsxfsi_libfunc;
436 extern rtx fixunsxfdi_libfunc;
437 extern rtx fixunsxfti_libfunc;
439 extern rtx fixunstfsi_libfunc;
440 extern rtx fixunstfdi_libfunc;
441 extern rtx fixunstfti_libfunc;
443 typedef rtx (*rtxfun) ();
445 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
446 gives the gen_function to make a branch to test that condition. */
448 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
450 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
451 gives the insn code to make a store-condition insn
452 to test that condition. */
454 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
456 /* This array records the insn_code of insns to perform block moves. */
457 extern enum insn_code movstr_optab[NUM_MACHINE_MODES];
459 /* Define functions given in optabs.c. */
461 /* Expand a binary operation given optab and rtx operands. */
462 extern rtx expand_binop PROTO((enum machine_mode, optab, rtx, rtx, rtx,
463 int, enum optab_methods));
465 /* Expand a binary operation with both signed and unsigned forms. */
466 extern rtx sign_expand_binop PROTO((enum machine_mode, optab, optab, rtx,
467 rtx, rtx, int, enum optab_methods));
469 /* Generate code to perform an operation on two operands with two results. */
470 extern int expand_twoval_binop PROTO((optab, rtx, rtx, rtx, rtx, int));
472 /* Expand a unary arithmetic operation given optab rtx operand. */
473 extern rtx expand_unop PROTO((enum machine_mode, optab, rtx, rtx, int));
475 /* Expand the complex absolute value operation. */
476 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
478 /* Generate an instruction with a given INSN_CODE with an output and
480 extern void emit_unop_insn PROTO((int, rtx, rtx, enum rtx_code));
482 /* Emit code to perform a series of operations on a multi-word quantity, one
484 extern rtx emit_no_conflict_block PROTO((rtx, rtx, rtx, rtx, rtx));
486 /* Emit code to make a call to a constant function or a library call. */
487 extern void emit_libcall_block PROTO((rtx, rtx, rtx, rtx));
489 /* Emit one rtl instruction to store zero in specified rtx. */
490 extern void emit_clr_insn PROTO((rtx));
492 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0. */
493 extern void emit_0_to_1_insn PROTO((rtx));
495 /* Emit one rtl insn to compare two rtx's. */
496 extern void emit_cmp_insn PROTO((rtx, rtx, enum rtx_code, rtx,
497 enum machine_mode, int, int));
499 /* Nonzero if a compare of mode MODE can be done straightforwardly
500 (without splitting it into pieces). */
501 extern int can_compare_p PROTO((enum machine_mode));
503 /* Emit a library call comparison between floating point X and Y.
504 COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.). */
505 extern void emit_float_lib_cmp PROTO((rtx, rtx, enum rtx_code));
507 /* Generate code to indirectly jump to a location given in the rtx LOC. */
508 extern void emit_indirect_jump PROTO((rtx));
510 /* Create but don't emit one rtl instruction to add one rtx into another.
511 Modes must match; operands must meet the operation's predicates.
512 Likewise for subtraction and for just copying.
513 These do not call protect_from_queue; caller must do so. */
514 extern rtx gen_add2_insn PROTO((rtx, rtx));
515 extern rtx gen_sub2_insn PROTO((rtx, rtx));
516 extern rtx gen_move_insn PROTO((rtx, rtx));
517 extern int have_add2_insn PROTO((enum machine_mode));
518 extern int have_sub2_insn PROTO((enum machine_mode));
520 /* Return the INSN_CODE to use for an extend operation. */
521 extern enum insn_code can_extend_p PROTO((enum machine_mode,
522 enum machine_mode, int));
524 /* Generate the body of an insn to extend Y (with mode MFROM)
525 into X (with mode MTO). Do zero-extension if UNSIGNEDP is nonzero. */
526 extern rtx gen_extend_insn PROTO((rtx, rtx, enum machine_mode,
527 enum machine_mode, int));
529 /* Initialize the tables that control conversion between fixed and
531 extern void init_fixtab PROTO((void));
532 extern void init_floattab PROTO((void));
534 /* Generate code for a FLOAT_EXPR. */
535 extern void expand_float PROTO((rtx, rtx, int));
537 /* Generate code for a FIX_EXPR. */
538 extern void expand_fix PROTO((rtx, rtx, int));
540 /* Call this once to initialize the contents of the optabs
541 appropriately for the current target machine. */
542 extern void init_optabs PROTO((void));
544 /* Functions from expmed.c: */
546 /* Arguments MODE, RTX: return an rtx for the negation of that value.
548 extern rtx negate_rtx PROTO((enum machine_mode, rtx));
550 /* Expand a logical AND operation. */
551 extern rtx expand_and PROTO((rtx, rtx, rtx));
553 /* Emit a store-flag operation. */
554 extern rtx emit_store_flag PROTO((rtx, enum rtx_code, rtx, rtx,
555 enum machine_mode, int, int));
557 /* Functions from loop.c: */
559 /* Given a JUMP_INSN, return a description of the test being made. */
560 extern rtx get_condition PROTO((rtx, rtx *));
562 /* Functions from expr.c: */
564 /* This is run once per compilation to set up which modes can be used
565 directly in memory and to initialize the block move optab. */
566 extern void init_expr_once PROTO((void));
568 /* This is run at the start of compiling a function. */
569 extern void init_expr PROTO((void));
571 /* Use protect_from_queue to convert a QUEUED expression
572 into something that you can put immediately into an instruction. */
573 extern rtx protect_from_queue PROTO((rtx, int));
575 /* Perform all the pending incrementations. */
576 extern void emit_queue PROTO((void));
578 /* Emit some rtl insns to move data between rtx's, converting machine modes.
579 Both modes must be floating or both fixed. */
580 extern void convert_move PROTO((rtx, rtx, int));
582 /* Convert an rtx to specified machine mode and return the result. */
583 extern rtx convert_to_mode PROTO((enum machine_mode, rtx, int));
585 /* Convert an rtx to MODE from OLDMODE and return the result. */
586 extern rtx convert_modes PROTO((enum machine_mode, enum machine_mode, rtx, int));
588 /* Emit code to move a block Y to a block X. */
589 extern void emit_block_move PROTO((rtx, rtx, rtx, int));
591 /* Copy all or part of a value X into registers starting at REGNO.
592 The number of registers to be filled is NREGS. */
593 extern void move_block_to_reg PROTO((int, rtx, int, enum machine_mode));
595 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
596 The number of registers to be filled is NREGS. */
597 extern void move_block_from_reg PROTO((int, rtx, int, int));
599 /* Mark NREGS consecutive regs, starting at REGNO, as being live now. */
600 extern void use_regs PROTO((int, int));
602 /* Write zeros through the storage of OBJECT.
603 If OBJECT has BLKmode, SIZE is its length in bytes. */
604 extern void clear_storage PROTO((rtx, int));
606 /* Emit insns to set X from Y. */
607 extern rtx emit_move_insn PROTO((rtx, rtx));
609 /* Emit insns to set X from Y, with no frills. */
610 extern rtx emit_move_insn_1 PROTO ((rtx, rtx));
612 /* Push a block of length SIZE (perhaps variable)
613 and return an rtx to address the beginning of the block. */
614 extern rtx push_block PROTO((rtx, int, int));
616 /* Make an operand to push someting on the stack. */
617 extern rtx gen_push_operand PROTO((void));
620 /* Generate code to push something onto the stack, given its mode and type. */
621 extern void emit_push_insn PROTO((rtx, enum machine_mode, tree, rtx, int,
622 int, rtx, int, rtx, rtx));
624 /* Emit library call. */
625 extern void emit_library_call PVPROTO((rtx orgfun, int no_queue,
626 enum machine_mode outmode, int nargs, ...));
627 extern rtx emit_library_call_value PVPROTO((rtx orgfun, rtx value, int no_queue,
628 enum machine_mode outmode, int nargs, ...));
630 /* Expand an assignment that stores the value of FROM into TO. */
631 extern rtx expand_assignment PROTO((tree, tree, int, int));
633 /* Generate code for computing expression EXP,
634 and storing the value into TARGET.
635 If SUGGEST_REG is nonzero, copy the value through a register
636 and return that register, if that is possible. */
637 extern rtx store_expr PROTO((tree, rtx, int));
640 /* Given an rtx that may include add and multiply operations,
641 generate them as insns and return a pseudo-reg containing the value.
642 Useful after calling expand_expr with 1 as sum_ok. */
643 extern rtx force_operand PROTO((rtx, rtx));
646 /* Generate code for computing expression EXP.
647 An rtx for the computed value is returned. The value is never null.
648 In the case of a void EXP, const0_rtx is returned. */
649 extern rtx expand_expr PROTO((tree, rtx, enum machine_mode,
650 enum expand_modifier));
653 /* At the start of a function, record that we have no previously-pushed
654 arguments waiting to be popped. */
655 extern void init_pending_stack_adjust PROTO((void));
657 /* When exiting from function, if safe, clear out any pending stack adjust
658 so the adjustment won't get done. */
659 extern void clear_pending_stack_adjust PROTO((void));
661 /* Pop any previously-pushed arguments that have not been popped yet. */
662 extern void do_pending_stack_adjust PROTO((void));
665 /* Expand all cleanups up to OLD_CLEANUPS. */
666 extern void expand_cleanups_to PROTO((tree));
668 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
669 extern void jumpifnot PROTO((tree, rtx));
671 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
672 extern void jumpif PROTO((tree, rtx));
674 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
675 the result is zero, or IF_TRUE_LABEL if the result is one. */
676 extern void do_jump PROTO((tree, rtx, rtx));
679 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
680 extern rtx compare_from_rtx PROTO((rtx, rtx, enum rtx_code, int,
681 enum machine_mode, rtx, int));
683 /* Generate a tablejump instruction (used for switch statements). */
684 extern void do_tablejump PROTO((rtx, enum machine_mode, rtx, rtx, rtx));
687 /* rtl.h and tree.h were included. */
688 /* Return an rtx for the size in bytes of the value of an expr. */
689 extern rtx expr_size PROTO((tree));
691 extern rtx lookup_static_chain PROTO((tree));
693 /* Convert a stack slot address ADDR valid in function FNDECL
694 into an address valid in this function (using a static chain). */
695 extern rtx fix_lexical_addr PROTO((rtx, tree));
697 /* Return the address of the trampoline for entering nested fn FUNCTION. */
698 extern rtx trampoline_address PROTO((tree));
700 /* Return an rtx that refers to the value returned by a function
701 in its original home. This becomes invalid if any more code is emitted. */
702 extern rtx hard_function_value PROTO((tree, tree));
704 extern rtx prepare_call_address PROTO((rtx, tree, rtx *, int));
706 extern rtx expand_call PROTO((tree, rtx, int));
708 extern rtx expand_shift PROTO((enum tree_code, enum machine_mode, rtx, tree, rtx, int));
709 extern rtx expand_divmod PROTO((int, enum tree_code, enum machine_mode, rtx, rtx, rtx, int));
710 extern void locate_and_pad_parm PROTO((enum machine_mode, tree, int, tree, struct args_size *, struct args_size *, struct args_size *));
711 extern rtx expand_inline_function PROTO((tree, tree, rtx, int, tree, rtx));
712 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
713 extern rtx label_rtx PROTO((tree));
716 /* Indicate how an input argument register was promoted. */
717 extern rtx promoted_input_arg PROTO((int, enum machine_mode *, int *));
719 /* Return an rtx like arg but sans any constant terms.
720 Returns the original rtx if it has no constant terms.
721 The constant terms are added and stored via a second arg. */
722 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
724 /* Convert arg to a valid memory address for specified machine mode,
725 by emitting insns to perform arithmetic if nec. */
726 extern rtx memory_address PROTO((enum machine_mode, rtx));
728 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
729 extern rtx memory_address_noforce PROTO((enum machine_mode, rtx));
731 /* Return a memory reference like MEMREF, but with its mode changed
732 to MODE and its address changed to ADDR.
733 (VOIDmode means don't change the mode.
734 NULL for ADDR means don't change the address.) */
735 extern rtx change_address PROTO((rtx, enum machine_mode, rtx));
737 /* Return a memory reference like MEMREF, but which is known to have a
740 extern rtx validize_mem PROTO((rtx));
742 /* Assemble the static constant template for function entry trampolines. */
743 extern rtx assemble_trampoline_template PROTO((void));
745 /* Return 1 if two rtx's are equivalent in structure and elements. */
746 extern int rtx_equal_p PROTO((rtx, rtx));
748 /* Given rtx, return new rtx whose address won't be affected by
749 any side effects. It has been copied to a new temporary reg. */
750 extern rtx stabilize PROTO((rtx));
752 /* Given an rtx, copy all regs it refers to into new temps
753 and return a modified copy that refers to the new temps. */
754 extern rtx copy_all_regs PROTO((rtx));
756 /* Copy given rtx to a new temp reg and return that. */
757 extern rtx copy_to_reg PROTO((rtx));
759 /* Like copy_to_reg but always make the reg Pmode. */
760 extern rtx copy_addr_to_reg PROTO((rtx));
762 /* Like copy_to_reg but always make the reg the specified mode MODE. */
763 extern rtx copy_to_mode_reg PROTO((enum machine_mode, rtx));
765 /* Copy given rtx to given temp reg and return that. */
766 extern rtx copy_to_suggested_reg PROTO((rtx, rtx, enum machine_mode));
768 /* Copy a value to a register if it isn't already a register.
769 Args are mode (in case value is a constant) and the value. */
770 extern rtx force_reg PROTO((enum machine_mode, rtx));
772 /* Return given rtx, copied into a new temp reg if it was in memory. */
773 extern rtx force_not_mem PROTO((rtx));
776 /* Return mode and signedness to use when object is promoted. */
777 extern enum machine_mode promote_mode PROTO((tree, enum machine_mode,
781 /* Remove some bytes from the stack. An rtx says how many. */
782 extern void adjust_stack PROTO((rtx));
784 /* Add some bytes to the stack. An rtx says how many. */
785 extern void anti_adjust_stack PROTO((rtx));
787 /* This enum is used for the following two functions. */
788 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
790 /* Save the stack pointer at the specified level. */
791 extern void emit_stack_save PROTO((enum save_level, rtx *, rtx));
793 /* Restore the stack pointer from a save area of the specified level. */
794 extern void emit_stack_restore PROTO((enum save_level, rtx, rtx));
796 /* Allocate some space on the stack dynamically and return its address. An rtx
797 says how many bytes. */
798 extern rtx allocate_dynamic_stack_space PROTO((rtx, rtx, int));
800 /* Emit code to copy function value to a new temp reg and return that reg. */
801 extern rtx function_value ();
803 /* Return an rtx that refers to the value returned by a library call
804 in its original home. This becomes invalid if any more code is emitted. */
805 extern rtx hard_libcall_value PROTO((enum machine_mode));
807 /* Given an rtx, return an rtx for a value rounded up to a multiple
808 of STACK_BOUNDARY / BITS_PER_UNIT. */
809 extern rtx round_push PROTO((rtx));
811 extern void emit_block_move PROTO((rtx, rtx, rtx, int));
813 extern rtx store_bit_field PROTO((rtx, int, int, enum machine_mode, rtx, int, int));
814 extern rtx extract_bit_field PROTO((rtx, int, int, int, rtx, enum machine_mode, enum machine_mode, int, int));
815 extern rtx expand_mult PROTO((enum machine_mode, rtx, rtx, rtx, int));
816 extern rtx expand_mult_add PROTO((rtx, rtx, rtx, rtx,enum machine_mode, int));
818 extern rtx assemble_static_space PROTO((int));
820 /* Hook called by expand_expr for language-specific tree codes.
821 It is up to the language front end to install a hook
822 if it has any such codes that expand_expr needs to know about. */
823 extern rtx (*lang_expand_expr) ();