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 EXPAND_MEMORY_USE_* are explained below. */
50 enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM,
51 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER,
52 EXPAND_MEMORY_USE_WO, EXPAND_MEMORY_USE_RW,
53 EXPAND_MEMORY_USE_BAD, EXPAND_MEMORY_USE_DONT};
55 /* Argument for chkr_* functions.
56 MEMORY_USE_RO: the pointer reads memory.
57 MEMORY_USE_WO: the pointer writes to memory.
58 MEMORY_USE_RW: the pointer modifies memory (ie it reads and writes). An
60 MEMORY_USE_BAD: use this if you don't know the behavior of the pointer, or
61 if you know there are no pointers. Using an INDIRECT_REF
62 with MEMORY_USE_BAD will abort.
63 MEMORY_USE_TW: just test for writing, without update. Special.
64 MEMORY_USE_DONT: the memory is neither read nor written. This is used by
66 enum memory_use_mode {MEMORY_USE_BAD = 0, MEMORY_USE_RO = 1,
67 MEMORY_USE_WO = 2, MEMORY_USE_RW = 3,
68 MEMORY_USE_TW = 6, MEMORY_USE_DONT = 99};
70 /* List of labels that must never be deleted. */
71 extern rtx forced_labels;
73 /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
74 So we can mark them all live at the end of the function, if stupid. */
75 extern rtx save_expr_regs;
77 extern int current_function_calls_alloca;
78 extern int current_function_outgoing_args_size;
80 /* This is the offset from the arg pointer to the place where the first
81 anonymous arg can be found, if there is one. */
82 extern rtx current_function_arg_offset_rtx;
84 /* This is nonzero if the current function uses the constant pool. */
85 extern int current_function_uses_const_pool;
87 /* This is nonzero if the current function uses pic_offset_table_rtx. */
88 extern int current_function_uses_pic_offset_table;
90 /* The arg pointer hard register, or the pseudo into which it was copied. */
91 extern rtx current_function_internal_arg_pointer;
93 /* Nonzero means stack pops must not be deferred, and deferred stack
94 pops must not be output. It is nonzero inside a function call,
95 inside a conditional expression, inside a statement expression,
96 and in other cases as well. */
97 extern int inhibit_defer_pop;
99 /* Number of function calls seen so far in current function. */
101 extern int function_call_count;
103 /* RTX for stack slot that holds the current handler for nonlocal gotos.
104 Zero when function does not have nonlocal labels. */
106 extern rtx nonlocal_goto_handler_slot;
108 /* RTX for stack slot that holds the stack pointer value to restore
110 Zero when function does not have nonlocal labels. */
112 extern rtx nonlocal_goto_stack_level;
114 /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
115 (labels to which there can be nonlocal gotos from nested functions)
118 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
119 extern tree nonlocal_labels;
122 #define NO_DEFER_POP (inhibit_defer_pop += 1)
123 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
125 /* Number of units that we should eventually pop off the stack.
126 These are the arguments to function calls that have already returned. */
127 extern int pending_stack_adjust;
129 /* When temporaries are created by TARGET_EXPRs, they are created at
130 this level of temp_slot_level, so that they can remain allocated
131 until no longer needed. CLEANUP_POINT_EXPRs define the lifetime
133 extern int target_temp_slot_level;
135 #ifdef TREE_CODE /* Don't lose if tree.h not included. */
136 /* Structure to record the size of a sequence of arguments
137 as the sum of a tree-expression and a constant. */
146 /* Add the value of the tree INC to the `struct args_size' TO. */
148 #define ADD_PARM_SIZE(TO, INC) \
149 { tree inc = (INC); \
150 if (TREE_CODE (inc) == INTEGER_CST) \
151 (TO).constant += TREE_INT_CST_LOW (inc); \
152 else if ((TO).var == 0) \
155 (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
157 #define SUB_PARM_SIZE(TO, DEC) \
158 { tree dec = (DEC); \
159 if (TREE_CODE (dec) == INTEGER_CST) \
160 (TO).constant -= TREE_INT_CST_LOW (dec); \
161 else if ((TO).var == 0) \
162 (TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
164 (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
166 /* Convert the implicit sum in a `struct args_size' into an rtx. */
167 #define ARGS_SIZE_RTX(SIZE) \
168 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \
169 : expand_expr (size_binop (PLUS_EXPR, (SIZE).var, \
170 size_int ((SIZE).constant)), \
171 NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD))
173 /* Convert the implicit sum in a `struct args_size' into a tree. */
174 #define ARGS_SIZE_TREE(SIZE) \
175 ((SIZE).var == 0 ? size_int ((SIZE).constant) \
176 : size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
178 /* Supply a default definition for FUNCTION_ARG_PADDING:
179 usually pad upward, but pad short args downward on
180 big-endian machines. */
182 enum direction {none, upward, downward}; /* Value has this type. */
184 #ifndef FUNCTION_ARG_PADDING
185 #define FUNCTION_ARG_PADDING(MODE, TYPE) \
186 (! BYTES_BIG_ENDIAN \
188 : (((MODE) == BLKmode \
189 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
190 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
191 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \
192 ? downward : upward))
195 /* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let
196 FUNCTION_ARG_PADDING, which also pads the length, handle any needed
199 #ifndef FUNCTION_ARG_BOUNDARY
200 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY
203 /* Nonzero if we do not know how to pass TYPE solely in registers.
204 We cannot do so in the following cases:
206 - if the type has variable size
207 - if the type is marked as addressable (it is required to be constructed
209 - if the padding and mode of the type is such that a copy into a register
210 would put it into the wrong part of the register.
212 Which padding can't be supported depends on the byte endianness.
214 A value in a register is implicitly padded at the most significant end.
215 On a big-endian machine, that is the lower end in memory.
216 So a value padded in memory at the upper end can't go in a register.
217 For a little-endian machine, the reverse is true. */
219 #define MUST_PASS_IN_STACK(MODE,TYPE) \
221 && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
222 || TREE_ADDRESSABLE (TYPE) \
223 || ((MODE) == BLKmode \
224 && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
225 && 0 == (int_size_in_bytes (TYPE) \
226 % (PARM_BOUNDARY / BITS_PER_UNIT))) \
227 && (FUNCTION_ARG_PADDING (MODE, TYPE) \
228 == (BYTES_BIG_ENDIAN ? upward : downward)))))
230 /* Nonzero if type TYPE should be returned in memory.
231 Most machines can use the following default definition. */
233 #ifndef RETURN_IN_MEMORY
234 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
237 /* Provide default values for the macros controlling stack checking. */
239 #ifndef STACK_CHECK_BUILTIN
240 #define STACK_CHECK_BUILTIN 0
243 /* The default interval is one page. */
244 #ifndef STACK_CHECK_PROBE_INTERVAL
245 #define STACK_CHECK_PROBE_INTERVAL 4096
248 /* The default is to do a store into the stack. */
249 #ifndef STACK_CHECK_PROBE_LOAD
250 #define STACK_CHECK_PROBE_LOAD 0
253 /* This value is arbitrary, but should be sufficient for most machines. */
254 #ifndef STACK_CHECK_PROTECT
255 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
258 /* Make the maximum frame size be the largest we can and still only need
259 one probe per function. */
260 #ifndef STACK_CHECK_MAX_FRAME_SIZE
261 #define STACK_CHECK_MAX_FRAME_SIZE \
262 (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
265 /* This is arbitrary, but should be large enough everywhere. */
266 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
267 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
270 /* Provide a reasonable default for the maximum size of an object to
271 allocate in the fixed frame. We may need to be able to make this
272 controllable by the user at some point. */
273 #ifndef STACK_CHECK_MAX_VAR_SIZE
274 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
277 /* Optabs are tables saying how to generate insn bodies
278 for various machine modes and numbers of operands.
279 Each optab applies to one operation.
280 For example, add_optab applies to addition.
282 The insn_code slot is the enum insn_code that says how to
283 generate an insn for this operation on a particular machine mode.
284 It is CODE_FOR_nothing if there is no such insn on the target machine.
286 The `lib_call' slot is the name of the library function that
287 can be used to perform the operation.
289 A few optabs, such as move_optab and cmp_optab, are used
292 /* Everything that uses expr.h needs to define enum insn_code
293 but we don't list it in the Makefile dependencies just for that. */
294 #include "insn-codes.h"
300 enum insn_code insn_code;
302 } handlers [NUM_MACHINE_MODES];
305 /* Given an enum insn_code, access the function to construct
306 the body of that kind of insn. */
307 #ifdef FUNCTION_CONVERSION_BUG
308 /* Some compilers fail to convert a function properly to a
309 pointer-to-function when used as an argument.
310 So produce the pointer-to-function directly.
311 Luckily, these compilers seem to work properly when you
312 call the pointer-to-function. */
313 #define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
315 #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
318 extern rtx (*const insn_gen_function[]) PROTO ((rtx, ...));
320 extern optab add_optab;
321 extern optab sub_optab;
322 extern optab smul_optab; /* Signed and floating-point multiply */
323 extern optab smul_highpart_optab; /* Signed multiply, return high word */
324 extern optab umul_highpart_optab;
325 extern optab smul_widen_optab; /* Signed multiply with result
326 one machine mode wider than args */
327 extern optab umul_widen_optab;
328 extern optab sdiv_optab; /* Signed divide */
329 extern optab sdivmod_optab; /* Signed divide-and-remainder in one */
330 extern optab udiv_optab;
331 extern optab udivmod_optab;
332 extern optab smod_optab; /* Signed remainder */
333 extern optab umod_optab;
334 extern optab flodiv_optab; /* Optab for floating divide. */
335 extern optab ftrunc_optab; /* Convert float to integer in float fmt */
336 extern optab and_optab; /* Logical and */
337 extern optab ior_optab; /* Logical or */
338 extern optab xor_optab; /* Logical xor */
339 extern optab ashl_optab; /* Arithmetic shift left */
340 extern optab ashr_optab; /* Arithmetic shift right */
341 extern optab lshr_optab; /* Logical shift right */
342 extern optab rotl_optab; /* Rotate left */
343 extern optab rotr_optab; /* Rotate right */
344 extern optab smin_optab; /* Signed and floating-point minimum value */
345 extern optab smax_optab; /* Signed and floating-point maximum value */
346 extern optab umin_optab; /* Unsigned minimum value */
347 extern optab umax_optab; /* Unsigned maximum value */
349 extern optab mov_optab; /* Move instruction. */
350 extern optab movstrict_optab; /* Move, preserving high part of register. */
352 extern optab cmp_optab; /* Compare insn; two operands. */
353 extern optab tst_optab; /* tst insn; compare one operand against 0 */
355 /* Unary operations */
356 extern optab neg_optab; /* Negation */
357 extern optab abs_optab; /* Abs value */
358 extern optab one_cmpl_optab; /* Bitwise not */
359 extern optab ffs_optab; /* Find first bit set */
360 extern optab sqrt_optab; /* Square root */
361 extern optab sin_optab; /* Sine */
362 extern optab cos_optab; /* Cosine */
363 extern optab strlen_optab; /* String length */
365 /* Tables of patterns for extending one integer mode to another. */
366 extern enum insn_code extendtab[MAX_MACHINE_MODE][MAX_MACHINE_MODE][2];
368 /* Tables of patterns for converting between fixed and floating point. */
369 extern enum insn_code fixtab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
370 extern enum insn_code fixtrunctab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
371 extern enum insn_code floattab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
373 /* Contains the optab used for each rtx code. */
374 extern optab code_to_optab[NUM_RTX_CODE + 1];
376 /* Passed to expand_binop and expand_unop to say which options to try to use
377 if the requested operation can't be open-coded on the requisite mode.
378 Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
379 Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
380 OPTAB_MUST_WIDEN says try widening and don't try anything else. */
391 /* SYMBOL_REF rtx's for the library functions that are called
392 implicitly and not via optabs. */
394 extern rtx extendsfdf2_libfunc;
395 extern rtx extendsfxf2_libfunc;
396 extern rtx extendsftf2_libfunc;
397 extern rtx extenddfxf2_libfunc;
398 extern rtx extenddftf2_libfunc;
400 extern rtx truncdfsf2_libfunc;
401 extern rtx truncxfsf2_libfunc;
402 extern rtx trunctfsf2_libfunc;
403 extern rtx truncxfdf2_libfunc;
404 extern rtx trunctfdf2_libfunc;
406 extern rtx memcpy_libfunc;
407 extern rtx bcopy_libfunc;
408 extern rtx memcmp_libfunc;
409 extern rtx bcmp_libfunc;
410 extern rtx memset_libfunc;
411 extern rtx bzero_libfunc;
413 extern rtx throw_libfunc;
414 extern rtx sjthrow_libfunc;
415 extern rtx sjpopnthrow_libfunc;
416 extern rtx terminate_libfunc;
417 extern rtx setjmp_libfunc;
418 extern rtx longjmp_libfunc;
419 extern rtx get_dynamic_handler_chain_libfunc;
421 extern rtx eqhf2_libfunc;
422 extern rtx nehf2_libfunc;
423 extern rtx gthf2_libfunc;
424 extern rtx gehf2_libfunc;
425 extern rtx lthf2_libfunc;
426 extern rtx lehf2_libfunc;
428 extern rtx eqsf2_libfunc;
429 extern rtx nesf2_libfunc;
430 extern rtx gtsf2_libfunc;
431 extern rtx gesf2_libfunc;
432 extern rtx ltsf2_libfunc;
433 extern rtx lesf2_libfunc;
435 extern rtx eqdf2_libfunc;
436 extern rtx nedf2_libfunc;
437 extern rtx gtdf2_libfunc;
438 extern rtx gedf2_libfunc;
439 extern rtx ltdf2_libfunc;
440 extern rtx ledf2_libfunc;
442 extern rtx eqxf2_libfunc;
443 extern rtx nexf2_libfunc;
444 extern rtx gtxf2_libfunc;
445 extern rtx gexf2_libfunc;
446 extern rtx ltxf2_libfunc;
447 extern rtx lexf2_libfunc;
449 extern rtx eqtf2_libfunc;
450 extern rtx netf2_libfunc;
451 extern rtx gttf2_libfunc;
452 extern rtx getf2_libfunc;
453 extern rtx lttf2_libfunc;
454 extern rtx letf2_libfunc;
456 extern rtx floatsisf_libfunc;
457 extern rtx floatdisf_libfunc;
458 extern rtx floattisf_libfunc;
460 extern rtx floatsidf_libfunc;
461 extern rtx floatdidf_libfunc;
462 extern rtx floattidf_libfunc;
464 extern rtx floatsixf_libfunc;
465 extern rtx floatdixf_libfunc;
466 extern rtx floattixf_libfunc;
468 extern rtx floatsitf_libfunc;
469 extern rtx floatditf_libfunc;
470 extern rtx floattitf_libfunc;
472 extern rtx fixsfsi_libfunc;
473 extern rtx fixsfdi_libfunc;
474 extern rtx fixsfti_libfunc;
476 extern rtx fixdfsi_libfunc;
477 extern rtx fixdfdi_libfunc;
478 extern rtx fixdfti_libfunc;
480 extern rtx fixxfsi_libfunc;
481 extern rtx fixxfdi_libfunc;
482 extern rtx fixxfti_libfunc;
484 extern rtx fixtfsi_libfunc;
485 extern rtx fixtfdi_libfunc;
486 extern rtx fixtfti_libfunc;
488 extern rtx fixunssfsi_libfunc;
489 extern rtx fixunssfdi_libfunc;
490 extern rtx fixunssfti_libfunc;
492 extern rtx fixunsdfsi_libfunc;
493 extern rtx fixunsdfdi_libfunc;
494 extern rtx fixunsdfti_libfunc;
496 extern rtx fixunsxfsi_libfunc;
497 extern rtx fixunsxfdi_libfunc;
498 extern rtx fixunsxfti_libfunc;
500 extern rtx fixunstfsi_libfunc;
501 extern rtx fixunstfdi_libfunc;
502 extern rtx fixunstfti_libfunc;
504 /* For check-memory-usage. */
505 extern rtx chkr_check_addr_libfunc;
506 extern rtx chkr_set_right_libfunc;
507 extern rtx chkr_copy_bitmap_libfunc;
508 extern rtx chkr_check_exec_libfunc;
510 typedef rtx (*rtxfun) PROTO ((rtx));
512 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
513 gives the gen_function to make a branch to test that condition. */
515 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
517 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
518 gives the insn code to make a store-condition insn
519 to test that condition. */
521 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
523 #ifdef HAVE_conditional_move
524 /* Indexed by the the machine mode, gives the insn code to make a conditional
527 extern enum insn_code movcc_gen_code[NUM_MACHINE_MODES];
530 /* This array records the insn_code of insns to perform block moves. */
531 extern enum insn_code movstr_optab[NUM_MACHINE_MODES];
533 /* This array records the insn_code of insns to perform block clears. */
534 extern enum insn_code clrstr_optab[NUM_MACHINE_MODES];
536 /* Define functions given in optabs.c. */
538 /* Expand a binary operation given optab and rtx operands. */
539 extern rtx expand_binop PROTO((enum machine_mode, optab, rtx, rtx, rtx,
540 int, enum optab_methods));
542 /* Expand a binary operation with both signed and unsigned forms. */
543 extern rtx sign_expand_binop PROTO((enum machine_mode, optab, optab, rtx,
544 rtx, rtx, int, enum optab_methods));
546 /* Generate code to perform an operation on two operands with two results. */
547 extern int expand_twoval_binop PROTO((optab, rtx, rtx, rtx, rtx, int));
549 /* Expand a unary arithmetic operation given optab rtx operand. */
550 extern rtx expand_unop PROTO((enum machine_mode, optab, rtx, rtx, int));
552 /* Expand the absolute value operation. */
553 extern rtx expand_abs PROTO((enum machine_mode, rtx, rtx, int, int));
555 /* Expand the complex absolute value operation. */
556 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
558 /* Generate an instruction with a given INSN_CODE with an output and
560 extern void emit_unop_insn PROTO((int, rtx, rtx, enum rtx_code));
562 /* Emit code to perform a series of operations on a multi-word quantity, one
564 extern rtx emit_no_conflict_block PROTO((rtx, rtx, rtx, rtx, rtx));
566 /* Emit code to make a call to a constant function or a library call. */
567 extern void emit_libcall_block PROTO((rtx, rtx, rtx, rtx));
569 /* Emit one rtl instruction to store zero in specified rtx. */
570 extern void emit_clr_insn PROTO((rtx));
572 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0. */
573 extern void emit_0_to_1_insn PROTO((rtx));
575 /* Emit one rtl insn to compare two rtx's. */
576 extern void emit_cmp_insn PROTO((rtx, rtx, enum rtx_code, rtx,
577 enum machine_mode, int, int));
579 /* Nonzero if a compare of mode MODE can be done straightforwardly
580 (without splitting it into pieces). */
581 extern int can_compare_p PROTO((enum machine_mode));
583 /* Emit a library call comparison between floating point X and Y.
584 COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.). */
585 extern void emit_float_lib_cmp PROTO((rtx, rtx, enum rtx_code));
587 /* Generate code to indirectly jump to a location given in the rtx LOC. */
588 extern void emit_indirect_jump PROTO((rtx));
590 #ifdef HAVE_conditional_move
591 /* Emit a conditional move operation. */
592 rtx emit_conditional_move PROTO((rtx, enum rtx_code, rtx, rtx,
593 enum machine_mode, rtx, rtx,
594 enum machine_mode, int));
596 /* Return non-zero if the conditional move is supported. */
597 int can_conditionally_move_p PROTO((enum machine_mode mode));
601 /* Create but don't emit one rtl instruction to add one rtx into another.
602 Modes must match; operands must meet the operation's predicates.
603 Likewise for subtraction and for just copying.
604 These do not call protect_from_queue; caller must do so. */
605 extern rtx gen_add2_insn PROTO((rtx, rtx));
606 extern rtx gen_sub2_insn PROTO((rtx, rtx));
607 extern rtx gen_move_insn PROTO((rtx, rtx));
608 extern int have_add2_insn PROTO((enum machine_mode));
609 extern int have_sub2_insn PROTO((enum machine_mode));
611 /* Return the INSN_CODE to use for an extend operation. */
612 extern enum insn_code can_extend_p PROTO((enum machine_mode,
613 enum machine_mode, int));
615 /* Generate the body of an insn to extend Y (with mode MFROM)
616 into X (with mode MTO). Do zero-extension if UNSIGNEDP is nonzero. */
617 extern rtx gen_extend_insn PROTO((rtx, rtx, enum machine_mode,
618 enum machine_mode, int));
620 /* Initialize the tables that control conversion between fixed and
622 extern void init_fixtab PROTO((void));
623 extern void init_floattab PROTO((void));
625 /* Generate code for a FLOAT_EXPR. */
626 extern void expand_float PROTO((rtx, rtx, int));
628 /* Generate code for a FIX_EXPR. */
629 extern void expand_fix PROTO((rtx, rtx, int));
631 /* Call this once to initialize the contents of the optabs
632 appropriately for the current target machine. */
633 extern void init_optabs PROTO((void));
635 /* Functions from expmed.c: */
637 /* Arguments MODE, RTX: return an rtx for the negation of that value.
639 extern rtx negate_rtx PROTO((enum machine_mode, rtx));
641 /* Expand a logical AND operation. */
642 extern rtx expand_and PROTO((rtx, rtx, rtx));
644 /* Emit a store-flag operation. */
645 extern rtx emit_store_flag PROTO((rtx, enum rtx_code, rtx, rtx,
646 enum machine_mode, int, int));
648 /* Like emit_store_flag, but always succeeds. */
649 extern rtx emit_store_flag_force PROTO((rtx, enum rtx_code, rtx, rtx,
650 enum machine_mode, int, int));
652 /* Functions from loop.c: */
654 /* Given a JUMP_INSN, return a description of the test being made. */
655 extern rtx get_condition PROTO((rtx, rtx *));
657 /* Functions from expr.c: */
659 /* This is run once per compilation to set up which modes can be used
660 directly in memory and to initialize the block move optab. */
661 extern void init_expr_once PROTO((void));
663 /* This is run at the start of compiling a function. */
664 extern void init_expr PROTO((void));
666 /* Use protect_from_queue to convert a QUEUED expression
667 into something that you can put immediately into an instruction. */
668 extern rtx protect_from_queue PROTO((rtx, int));
670 /* Perform all the pending incrementations. */
671 extern void emit_queue PROTO((void));
673 /* Emit some rtl insns to move data between rtx's, converting machine modes.
674 Both modes must be floating or both fixed. */
675 extern void convert_move PROTO((rtx, rtx, int));
677 /* Convert an rtx to specified machine mode and return the result. */
678 extern rtx convert_to_mode PROTO((enum machine_mode, rtx, int));
680 /* Convert an rtx to MODE from OLDMODE and return the result. */
681 extern rtx convert_modes PROTO((enum machine_mode, enum machine_mode, rtx, int));
683 /* Emit code to move a block Y to a block X. */
684 extern void emit_block_move PROTO((rtx, rtx, rtx, int));
686 /* Copy all or part of a value X into registers starting at REGNO.
687 The number of registers to be filled is NREGS. */
688 extern void move_block_to_reg PROTO((int, rtx, int, enum machine_mode));
690 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
691 The number of registers to be filled is NREGS. */
692 extern void move_block_from_reg PROTO((int, rtx, int, int));
694 /* Load a BLKmode value into non-consecutive registers represented by a
696 extern void emit_group_load PROTO((rtx, rtx));
697 /* Store a BLKmode value from non-consecutive registers represented by a
699 extern void emit_group_store PROTO((rtx, rtx));
701 /* Mark REG as holding a parameter for the next CALL_INSN. */
702 extern void use_reg PROTO((rtx *, rtx));
703 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
704 for the next CALL_INSN. */
705 extern void use_regs PROTO((rtx *, int, int));
706 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */
707 extern void use_group_regs PROTO((rtx *, rtx));
709 /* Write zeros through the storage of OBJECT.
710 If OBJECT has BLKmode, SIZE is its length in bytes and ALIGN is its
712 extern void clear_storage PROTO((rtx, rtx, int));
714 /* Emit insns to set X from Y. */
715 extern rtx emit_move_insn PROTO((rtx, rtx));
717 /* Emit insns to set X from Y, with no frills. */
718 extern rtx emit_move_insn_1 PROTO ((rtx, rtx));
720 /* Push a block of length SIZE (perhaps variable)
721 and return an rtx to address the beginning of the block. */
722 extern rtx push_block PROTO((rtx, int, int));
724 /* Make an operand to push something on the stack. */
725 extern rtx gen_push_operand PROTO((void));
728 /* Generate code to push something onto the stack, given its mode and type. */
729 extern void emit_push_insn PROTO((rtx, enum machine_mode, tree, rtx, int,
730 int, rtx, int, rtx, rtx));
732 /* Emit library call. */
733 extern void emit_library_call PVPROTO((rtx orgfun, int no_queue,
734 enum machine_mode outmode, int nargs, ...));
735 extern rtx emit_library_call_value PVPROTO((rtx orgfun, rtx value, int no_queue,
736 enum machine_mode outmode, int nargs, ...));
738 /* Expand an assignment that stores the value of FROM into TO. */
739 extern rtx expand_assignment PROTO((tree, tree, int, int));
741 /* Generate code for computing expression EXP,
742 and storing the value into TARGET.
743 If SUGGEST_REG is nonzero, copy the value through a register
744 and return that register, if that is possible. */
745 extern rtx store_expr PROTO((tree, rtx, int));
748 /* Given an rtx that may include add and multiply operations,
749 generate them as insns and return a pseudo-reg containing the value.
750 Useful after calling expand_expr with 1 as sum_ok. */
751 extern rtx force_operand PROTO((rtx, rtx));
753 extern rtx expand_builtin_setjmp PROTO((rtx, rtx));
756 /* Generate code for computing expression EXP.
757 An rtx for the computed value is returned. The value is never null.
758 In the case of a void EXP, const0_rtx is returned. */
759 extern rtx expand_expr PROTO((tree, rtx, enum machine_mode,
760 enum expand_modifier));
763 /* At the start of a function, record that we have no previously-pushed
764 arguments waiting to be popped. */
765 extern void init_pending_stack_adjust PROTO((void));
767 /* When exiting from function, if safe, clear out any pending stack adjust
768 so the adjustment won't get done. */
769 extern void clear_pending_stack_adjust PROTO((void));
771 /* Pop any previously-pushed arguments that have not been popped yet. */
772 extern void do_pending_stack_adjust PROTO((void));
775 /* Generate code to evaluate EXP and jump to LABEL if the value is zero. */
776 extern void jumpifnot PROTO((tree, rtx));
778 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */
779 extern void jumpif PROTO((tree, rtx));
781 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
782 the result is zero, or IF_TRUE_LABEL if the result is one. */
783 extern void do_jump PROTO((tree, rtx, rtx));
786 /* Generate rtl to compare two rtx's, will call emit_cmp_insn. */
787 extern rtx compare_from_rtx PROTO((rtx, rtx, enum rtx_code, int,
788 enum machine_mode, rtx, int));
790 /* Generate a tablejump instruction (used for switch statements). */
791 extern void do_tablejump PROTO((rtx, enum machine_mode, rtx, rtx, rtx));
794 /* rtl.h and tree.h were included. */
795 /* Return an rtx for the size in bytes of the value of an expr. */
796 extern rtx expr_size PROTO((tree));
798 extern rtx lookup_static_chain PROTO((tree));
800 /* Convert a stack slot address ADDR valid in function FNDECL
801 into an address valid in this function (using a static chain). */
802 extern rtx fix_lexical_addr PROTO((rtx, tree));
804 /* Return the address of the trampoline for entering nested fn FUNCTION. */
805 extern rtx trampoline_address PROTO((tree));
807 /* Return an rtx that refers to the value returned by a function
808 in its original home. This becomes invalid if any more code is emitted. */
809 extern rtx hard_function_value PROTO((tree, tree));
811 extern rtx prepare_call_address PROTO((rtx, tree, rtx *, int));
813 extern rtx expand_call PROTO((tree, rtx, int));
815 extern rtx expand_shift PROTO((enum tree_code, enum machine_mode, rtx, tree, rtx, int));
816 extern rtx expand_divmod PROTO((int, enum tree_code, enum machine_mode, rtx, rtx, rtx, int));
817 extern void locate_and_pad_parm PROTO((enum machine_mode, tree, int, tree, struct args_size *, struct args_size *, struct args_size *));
818 extern rtx expand_inline_function PROTO((tree, tree, rtx, int, tree, rtx));
819 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */
820 extern rtx label_rtx PROTO((tree));
823 /* Indicate how an input argument register was promoted. */
824 extern rtx promoted_input_arg PROTO((int, enum machine_mode *, int *));
826 /* Return an rtx like arg but sans any constant terms.
827 Returns the original rtx if it has no constant terms.
828 The constant terms are added and stored via a second arg. */
829 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
831 /* Convert arg to a valid memory address for specified machine mode,
832 by emitting insns to perform arithmetic if nec. */
833 extern rtx memory_address PROTO((enum machine_mode, rtx));
835 /* Like `memory_address' but pretent `flag_force_addr' is 0. */
836 extern rtx memory_address_noforce PROTO((enum machine_mode, rtx));
838 /* Return a memory reference like MEMREF, but with its mode changed
839 to MODE and its address changed to ADDR.
840 (VOIDmode means don't change the mode.
841 NULL for ADDR means don't change the address.) */
842 extern rtx change_address PROTO((rtx, enum machine_mode, rtx));
844 /* Return a memory reference like MEMREF, but which is known to have a
847 extern rtx validize_mem PROTO((rtx));
849 /* Assemble the static constant template for function entry trampolines. */
850 extern rtx assemble_trampoline_template PROTO((void));
852 /* Return 1 if two rtx's are equivalent in structure and elements. */
853 extern int rtx_equal_p PROTO((rtx, rtx));
855 /* Given rtx, return new rtx whose address won't be affected by
856 any side effects. It has been copied to a new temporary reg. */
857 extern rtx stabilize PROTO((rtx));
859 /* Given an rtx, copy all regs it refers to into new temps
860 and return a modified copy that refers to the new temps. */
861 extern rtx copy_all_regs PROTO((rtx));
863 /* Copy given rtx to a new temp reg and return that. */
864 extern rtx copy_to_reg PROTO((rtx));
866 /* Like copy_to_reg but always make the reg Pmode. */
867 extern rtx copy_addr_to_reg PROTO((rtx));
869 /* Like copy_to_reg but always make the reg the specified mode MODE. */
870 extern rtx copy_to_mode_reg PROTO((enum machine_mode, rtx));
872 /* Copy given rtx to given temp reg and return that. */
873 extern rtx copy_to_suggested_reg PROTO((rtx, rtx, enum machine_mode));
875 /* Copy a value to a register if it isn't already a register.
876 Args are mode (in case value is a constant) and the value. */
877 extern rtx force_reg PROTO((enum machine_mode, rtx));
879 /* Return given rtx, copied into a new temp reg if it was in memory. */
880 extern rtx force_not_mem PROTO((rtx));
883 /* Return mode and signedness to use when object is promoted. */
884 extern enum machine_mode promote_mode PROTO((tree, enum machine_mode,
888 /* Remove some bytes from the stack. An rtx says how many. */
889 extern void adjust_stack PROTO((rtx));
891 /* Add some bytes to the stack. An rtx says how many. */
892 extern void anti_adjust_stack PROTO((rtx));
894 /* This enum is used for the following two functions. */
895 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
897 /* Save the stack pointer at the specified level. */
898 extern void emit_stack_save PROTO((enum save_level, rtx *, rtx));
900 /* Restore the stack pointer from a save area of the specified level. */
901 extern void emit_stack_restore PROTO((enum save_level, rtx, rtx));
903 /* Allocate some space on the stack dynamically and return its address. An rtx
904 says how many bytes. */
905 extern rtx allocate_dynamic_stack_space PROTO((rtx, rtx, int));
907 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
908 FIRST is a constant and size is a Pmode RTX. These are offsets from the
909 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
910 subtract from the stack. If SIZE is constant, this is done
911 with a fixed number of probes. Otherwise, we must make a loop. */
912 extern void probe_stack_range PROTO((HOST_WIDE_INT, rtx));
914 /* Return an rtx that refers to the value returned by a library call
915 in its original home. This becomes invalid if any more code is emitted. */
916 extern rtx hard_libcall_value PROTO((enum machine_mode));
918 /* Given an rtx, return an rtx for a value rounded up to a multiple
919 of STACK_BOUNDARY / BITS_PER_UNIT. */
920 extern rtx round_push PROTO((rtx));
922 extern void emit_block_move PROTO((rtx, rtx, rtx, int));
924 extern rtx store_bit_field PROTO((rtx, int, int, enum machine_mode, rtx, int, int));
925 extern rtx extract_bit_field PROTO((rtx, int, int, int, rtx, enum machine_mode, enum machine_mode, int, int));
926 extern rtx expand_mult PROTO((enum machine_mode, rtx, rtx, rtx, int));
927 extern rtx expand_mult_add PROTO((rtx, rtx, rtx, rtx,enum machine_mode, int));
928 extern rtx expand_mult_highpart_adjust PROTO((enum machine_mode, rtx, rtx, rtx, rtx, int));
930 extern rtx assemble_static_space PROTO((int));
932 /* Hook called by expand_expr for language-specific tree codes.
933 It is up to the language front end to install a hook
934 if it has any such codes that expand_expr needs to know about. */
935 extern rtx (*lang_expand_expr) PROTO ((union tree_node *, rtx,
937 enum expand_modifier modifier));
940 /* Build bytecode call descriptor for function SUBR. */
941 extern rtx bc_build_calldesc PROTO((tree));
943 /* Emit a type code to be used by the runtime support in handling
944 parameter passing. The type code consists of the machine mode
945 plus the minimal alignment shifted left 8 bits. */
946 extern tree bc_runtime_type_code PROTO((tree));
949 extern void init_all_optabs PROTO ((void));
950 extern void init_mov_optab PROTO ((void));
951 extern void bc_adjust_stack PROTO ((int));
952 extern void bc_load_localaddr PROTO ((rtx));
953 extern void do_jump_by_parts_greater_rtx PROTO ((enum machine_mode, int,
954 rtx, rtx, rtx, rtx));