Daily bump.
[official-gcc.git] / gcc / genemit.c
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1 /* Generate code from machine description to emit insns as rtl.
2 Copyright (C) 1987, 1988, 1991, 1994, 1995, 1997, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
10 version.
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
20 02111-1307, USA. */
23 #include "hconfig.h"
24 #include "system.h"
25 #include "rtl.h"
26 #include "errors.h"
27 #include "gensupport.h"
30 static int max_opno;
31 static int max_dup_opno;
32 static int max_scratch_opno;
33 static int register_constraints;
34 static int insn_code_number;
35 static int insn_index_number;
37 /* Data structure for recording the patterns of insns that have CLOBBERs.
38 We use this to output a function that adds these CLOBBERs to a
39 previously-allocated PARALLEL expression. */
41 struct clobber_pat
43 struct clobber_ent *insns;
44 rtx pattern;
45 int first_clobber;
46 struct clobber_pat *next;
47 int has_hard_reg;
48 } *clobber_list;
50 /* Records one insn that uses the clobber list. */
52 struct clobber_ent
54 int code_number; /* Counts only insns. */
55 struct clobber_ent *next;
58 static void max_operand_1 PARAMS ((rtx));
59 static int max_operand_vec PARAMS ((rtx, int));
60 static void print_code PARAMS ((RTX_CODE));
61 static void gen_exp PARAMS ((rtx, enum rtx_code, char *));
62 static void gen_insn PARAMS ((rtx));
63 static void gen_expand PARAMS ((rtx));
64 static void gen_split PARAMS ((rtx));
65 static void output_add_clobbers PARAMS ((void));
66 static void output_added_clobbers_hard_reg_p PARAMS ((void));
67 static void gen_rtx_scratch PARAMS ((rtx, enum rtx_code));
68 static void output_peephole2_scratches PARAMS ((rtx));
71 static void
72 max_operand_1 (x)
73 rtx x;
75 RTX_CODE code;
76 int i;
77 int len;
78 const char *fmt;
80 if (x == 0)
81 return;
83 code = GET_CODE (x);
85 if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
86 register_constraints = 1;
87 if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
88 register_constraints = 1;
89 if (code == MATCH_OPERAND || code == MATCH_OPERATOR
90 || code == MATCH_PARALLEL)
91 max_opno = MAX (max_opno, XINT (x, 0));
92 if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
93 max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
94 if (code == MATCH_SCRATCH)
95 max_scratch_opno = MAX (max_scratch_opno, XINT (x, 0));
97 fmt = GET_RTX_FORMAT (code);
98 len = GET_RTX_LENGTH (code);
99 for (i = 0; i < len; i++)
101 if (fmt[i] == 'e' || fmt[i] == 'u')
102 max_operand_1 (XEXP (x, i));
103 else if (fmt[i] == 'E')
105 int j;
106 for (j = 0; j < XVECLEN (x, i); j++)
107 max_operand_1 (XVECEXP (x, i, j));
112 static int
113 max_operand_vec (insn, arg)
114 rtx insn;
115 int arg;
117 int len = XVECLEN (insn, arg);
118 int i;
120 max_opno = -1;
121 max_dup_opno = -1;
122 max_scratch_opno = -1;
124 for (i = 0; i < len; i++)
125 max_operand_1 (XVECEXP (insn, arg, i));
127 return max_opno + 1;
130 static void
131 print_code (code)
132 RTX_CODE code;
134 const char *p1;
135 for (p1 = GET_RTX_NAME (code); *p1; p1++)
136 putchar (TOUPPER(*p1));
139 static void
140 gen_rtx_scratch (x, subroutine_type)
141 rtx x;
142 enum rtx_code subroutine_type;
144 if (subroutine_type == DEFINE_PEEPHOLE2)
146 printf ("operand%d", XINT (x, 0));
148 else
150 printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
154 /* Print a C expression to construct an RTX just like X,
155 substituting any operand references appearing within. */
157 static void
158 gen_exp (x, subroutine_type, used)
159 rtx x;
160 enum rtx_code subroutine_type;
161 char *used;
163 RTX_CODE code;
164 int i;
165 int len;
166 const char *fmt;
168 if (x == 0)
170 printf ("NULL_RTX");
171 return;
174 code = GET_CODE (x);
176 switch (code)
178 case MATCH_OPERAND:
179 case MATCH_DUP:
180 if (used)
182 if (used[XINT (x, 0)])
184 printf ("copy_rtx (operand%d)", XINT (x, 0));
185 return;
187 used[XINT (x, 0)] = 1;
189 printf ("operand%d", XINT (x, 0));
190 return;
192 case MATCH_OP_DUP:
193 printf ("gen_rtx (GET_CODE (operand%d), ", XINT (x, 0));
194 if (GET_MODE (x) == VOIDmode)
195 printf ("GET_MODE (operand%d)", XINT (x, 0));
196 else
197 printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
198 for (i = 0; i < XVECLEN (x, 1); i++)
200 printf (",\n\t\t");
201 gen_exp (XVECEXP (x, 1, i), subroutine_type, used);
203 printf (")");
204 return;
206 case MATCH_OPERATOR:
207 printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
208 printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
209 for (i = 0; i < XVECLEN (x, 2); i++)
211 printf (",\n\t\t");
212 gen_exp (XVECEXP (x, 2, i), subroutine_type, used);
214 printf (")");
215 return;
217 case MATCH_PARALLEL:
218 case MATCH_PAR_DUP:
219 printf ("operand%d", XINT (x, 0));
220 return;
222 case MATCH_SCRATCH:
223 gen_rtx_scratch (x, subroutine_type);
224 return;
226 case ADDRESS:
227 fatal ("ADDRESS expression code used in named instruction pattern");
229 case PC:
230 printf ("pc_rtx");
231 return;
233 case CC0:
234 printf ("cc0_rtx");
235 return;
237 case CONST_INT:
238 if (INTVAL (x) == 0)
239 printf ("const0_rtx");
240 else if (INTVAL (x) == 1)
241 printf ("const1_rtx");
242 else if (INTVAL (x) == -1)
243 printf ("constm1_rtx");
244 else if (INTVAL (x) == STORE_FLAG_VALUE)
245 printf ("const_true_rtx");
246 else
248 printf ("GEN_INT (");
249 printf (HOST_WIDE_INT_PRINT_DEC, INTVAL (x));
250 printf (")");
252 return;
254 case CONST_DOUBLE:
255 /* These shouldn't be written in MD files. Instead, the appropriate
256 routines in varasm.c should be called. */
257 abort ();
259 default:
260 break;
263 printf ("gen_rtx_");
264 print_code (code);
265 printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
267 fmt = GET_RTX_FORMAT (code);
268 len = GET_RTX_LENGTH (code);
269 for (i = 0; i < len; i++)
271 if (fmt[i] == '0')
272 break;
273 printf (",\n\t");
274 if (fmt[i] == 'e' || fmt[i] == 'u')
275 gen_exp (XEXP (x, i), subroutine_type, used);
276 else if (fmt[i] == 'i')
277 printf ("%u", XINT (x, i));
278 else if (fmt[i] == 's')
279 printf ("\"%s\"", XSTR (x, i));
280 else if (fmt[i] == 'E')
282 int j;
283 printf ("gen_rtvec (%d", XVECLEN (x, i));
284 for (j = 0; j < XVECLEN (x, i); j++)
286 printf (",\n\t\t");
287 gen_exp (XVECEXP (x, i, j), subroutine_type, used);
289 printf (")");
291 else
292 abort ();
294 printf (")");
297 /* Generate the `gen_...' function for a DEFINE_INSN. */
299 static void
300 gen_insn (insn)
301 rtx insn;
303 int operands;
304 int i;
306 /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
307 registers or MATCH_SCRATCHes. If so, store away the information for
308 later. */
310 if (XVEC (insn, 1))
312 int has_hard_reg = 0;
314 for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
316 if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER)
317 break;
319 if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) == REG)
320 has_hard_reg = 1;
321 else if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH)
322 break;
325 if (i != XVECLEN (insn, 1) - 1)
327 struct clobber_pat *p;
328 struct clobber_ent *link
329 = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
330 int j;
332 link->code_number = insn_code_number;
334 /* See if any previous CLOBBER_LIST entry is the same as this
335 one. */
337 for (p = clobber_list; p; p = p->next)
339 if (p->first_clobber != i + 1
340 || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
341 continue;
343 for (j = i + 1; j < XVECLEN (insn, 1); j++)
345 rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
346 rtx new = XEXP (XVECEXP (insn, 1, j), 0);
348 /* OLD and NEW are the same if both are to be a SCRATCH
349 of the same mode,
350 or if both are registers of the same mode and number. */
351 if (! (GET_MODE (old) == GET_MODE (new)
352 && ((GET_CODE (old) == MATCH_SCRATCH
353 && GET_CODE (new) == MATCH_SCRATCH)
354 || (GET_CODE (old) == REG && GET_CODE (new) == REG
355 && REGNO (old) == REGNO (new)))))
356 break;
359 if (j == XVECLEN (insn, 1))
360 break;
363 if (p == 0)
365 p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
367 p->insns = 0;
368 p->pattern = insn;
369 p->first_clobber = i + 1;
370 p->next = clobber_list;
371 p->has_hard_reg = has_hard_reg;
372 clobber_list = p;
375 link->next = p->insns;
376 p->insns = link;
380 /* Don't mention instructions whose names are the null string
381 or begin with '*'. They are in the machine description just
382 to be recognized. */
383 if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
384 return;
386 /* Find out how many operands this function has,
387 and also whether any of them have register constraints. */
388 register_constraints = 0;
389 operands = max_operand_vec (insn, 1);
390 if (max_dup_opno >= operands)
391 fatal ("match_dup operand number has no match_operand");
393 /* Output the function name and argument declarations. */
394 printf ("rtx\ngen_%s (", XSTR (insn, 0));
395 for (i = 0; i < operands; i++)
396 if (i)
397 printf (", operand%d", i);
398 else
399 printf ("operand%d", i);
400 printf (")\n");
401 for (i = 0; i < operands; i++)
402 printf (" rtx operand%d;\n", i);
403 printf ("{\n");
405 /* Output code to construct and return the rtl for the instruction body */
407 if (XVECLEN (insn, 1) == 1)
409 printf (" return ");
410 gen_exp (XVECEXP (insn, 1, 0), DEFINE_INSN, NULL);
411 printf (";\n}\n\n");
413 else
415 printf (" return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d",
416 XVECLEN (insn, 1));
418 for (i = 0; i < XVECLEN (insn, 1); i++)
420 printf (",\n\t\t");
421 gen_exp (XVECEXP (insn, 1, i), DEFINE_INSN, NULL);
423 printf ("));\n}\n\n");
427 /* Generate the `gen_...' function for a DEFINE_EXPAND. */
429 static void
430 gen_expand (expand)
431 rtx expand;
433 int operands;
434 int i;
436 if (strlen (XSTR (expand, 0)) == 0)
437 fatal ("define_expand lacks a name");
438 if (XVEC (expand, 1) == 0)
439 fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
441 /* Find out how many operands this function has,
442 and also whether any of them have register constraints. */
443 register_constraints = 0;
445 operands = max_operand_vec (expand, 1);
447 /* Output the function name and argument declarations. */
448 printf ("rtx\ngen_%s (", XSTR (expand, 0));
449 for (i = 0; i < operands; i++)
450 if (i)
451 printf (", operand%d", i);
452 else
453 printf ("operand%d", i);
454 printf (")\n");
455 for (i = 0; i < operands; i++)
456 printf (" rtx operand%d;\n", i);
457 printf ("{\n");
459 /* If we don't have any C code to write, only one insn is being written,
460 and no MATCH_DUPs are present, we can just return the desired insn
461 like we do for a DEFINE_INSN. This saves memory. */
462 if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
463 && operands > max_dup_opno
464 && XVECLEN (expand, 1) == 1)
466 printf (" return ");
467 gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND, NULL);
468 printf (";\n}\n\n");
469 return;
472 /* For each operand referred to only with MATCH_DUPs,
473 make a local variable. */
474 for (i = operands; i <= max_dup_opno; i++)
475 printf (" rtx operand%d;\n", i);
476 for (; i <= max_scratch_opno; i++)
477 printf (" rtx operand%d ATTRIBUTE_UNUSED;\n", i);
478 printf (" rtx _val = 0;\n");
479 printf (" start_sequence ();\n");
481 /* The fourth operand of DEFINE_EXPAND is some code to be executed
482 before the actual construction.
483 This code expects to refer to `operands'
484 just as the output-code in a DEFINE_INSN does,
485 but here `operands' is an automatic array.
486 So copy the operand values there before executing it. */
487 if (XSTR (expand, 3) && *XSTR (expand, 3))
489 printf (" {\n");
490 if (operands > 0 || max_dup_opno >= 0 || max_scratch_opno >= 0)
491 printf (" rtx operands[%d];\n",
492 MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));
493 /* Output code to copy the arguments into `operands'. */
494 for (i = 0; i < operands; i++)
495 printf (" operands[%d] = operand%d;\n", i, i);
497 /* Output the special code to be executed before the sequence
498 is generated. */
499 printf ("%s\n", XSTR (expand, 3));
501 /* Output code to copy the arguments back out of `operands'
502 (unless we aren't going to use them at all). */
503 if (XVEC (expand, 1) != 0)
505 for (i = 0; i < operands; i++)
506 printf (" operand%d = operands[%d];\n", i, i);
507 for (; i <= max_dup_opno; i++)
508 printf (" operand%d = operands[%d];\n", i, i);
509 for (; i <= max_scratch_opno; i++)
510 printf (" operand%d = operands[%d];\n", i, i);
512 printf (" }\n");
515 /* Output code to construct the rtl for the instruction bodies.
516 Use emit_insn to add them to the sequence being accumulated.
517 But don't do this if the user's code has set `no_more' nonzero. */
519 for (i = 0; i < XVECLEN (expand, 1); i++)
521 rtx next = XVECEXP (expand, 1, i);
522 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
523 || (GET_CODE (next) == PARALLEL
524 && GET_CODE (XVECEXP (next, 0, 0)) == SET
525 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
526 || GET_CODE (next) == RETURN)
527 printf (" emit_jump_insn (");
528 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
529 || GET_CODE (next) == CALL
530 || (GET_CODE (next) == PARALLEL
531 && GET_CODE (XVECEXP (next, 0, 0)) == SET
532 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
533 || (GET_CODE (next) == PARALLEL
534 && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
535 printf (" emit_call_insn (");
536 else if (GET_CODE (next) == CODE_LABEL)
537 printf (" emit_label (");
538 else if (GET_CODE (next) == MATCH_OPERAND
539 || GET_CODE (next) == MATCH_DUP
540 || GET_CODE (next) == MATCH_OPERATOR
541 || GET_CODE (next) == MATCH_OP_DUP
542 || GET_CODE (next) == MATCH_PARALLEL
543 || GET_CODE (next) == MATCH_PAR_DUP
544 || GET_CODE (next) == PARALLEL)
545 printf (" emit (");
546 else
547 printf (" emit_insn (");
548 gen_exp (next, DEFINE_EXPAND, NULL);
549 printf (");\n");
550 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
551 && GET_CODE (SET_SRC (next)) == LABEL_REF)
552 printf (" emit_barrier ();");
555 /* Call `gen_sequence' to make a SEQUENCE out of all the
556 insns emitted within this gen_... function. */
558 printf (" _val = gen_sequence ();\n");
559 printf (" end_sequence ();\n");
560 printf (" return _val;\n}\n\n");
563 /* Like gen_expand, but generates a SEQUENCE. */
565 static void
566 gen_split (split)
567 rtx split;
569 int i;
570 int operands;
571 const char *const name =
572 ((GET_CODE (split) == DEFINE_PEEPHOLE2) ? "peephole2" : "split");
573 const char *unused;
574 char *used;
576 if (XVEC (split, 0) == 0)
577 fatal ("define_%s (definition %d) lacks a pattern", name,
578 insn_index_number);
579 else if (XVEC (split, 2) == 0)
580 fatal ("define_%s (definition %d) lacks a replacement pattern", name,
581 insn_index_number);
583 /* Find out how many operands this function has. */
585 max_operand_vec (split, 2);
586 operands = MAX (max_opno, MAX (max_dup_opno, max_scratch_opno)) + 1;
587 unused = (operands == 0 ? " ATTRIBUTE_UNUSED" : "");
588 used = xcalloc (1, operands);
590 /* Output the prototype, function name and argument declarations. */
591 if (GET_CODE (split) == DEFINE_PEEPHOLE2)
593 printf ("extern rtx gen_%s_%d PARAMS ((rtx, rtx *));\n",
594 name, insn_code_number);
595 printf ("rtx\ngen_%s_%d (curr_insn, operands)\n",
596 name, insn_code_number);
597 printf (" rtx curr_insn ATTRIBUTE_UNUSED;\n");
598 printf (" rtx *operands%s;\n", unused);
600 else
602 printf ("extern rtx gen_split_%d PARAMS ((rtx *));\n", insn_code_number);
603 printf ("rtx\ngen_%s_%d (operands)\n", name, insn_code_number);
604 printf (" rtx *operands%s;\n", unused);
606 printf ("{\n");
608 /* Declare all local variables. */
609 for (i = 0; i < operands; i++)
610 printf (" rtx operand%d;\n", i);
611 printf (" rtx _val = 0;\n");
613 if (GET_CODE (split) == DEFINE_PEEPHOLE2)
614 output_peephole2_scratches (split);
616 printf (" start_sequence ();\n");
618 /* The fourth operand of DEFINE_SPLIT is some code to be executed
619 before the actual construction. */
621 if (XSTR (split, 3))
622 printf ("%s\n", XSTR (split, 3));
624 /* Output code to copy the arguments back out of `operands' */
625 for (i = 0; i < operands; i++)
626 printf (" operand%d = operands[%d];\n", i, i);
628 /* Output code to construct the rtl for the instruction bodies.
629 Use emit_insn to add them to the sequence being accumulated.
630 But don't do this if the user's code has set `no_more' nonzero. */
632 for (i = 0; i < XVECLEN (split, 2); i++)
634 rtx next = XVECEXP (split, 2, i);
635 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
636 || (GET_CODE (next) == PARALLEL
637 && GET_CODE (XVECEXP (next, 0, 0)) == SET
638 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
639 || GET_CODE (next) == RETURN)
640 printf (" emit_jump_insn (");
641 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
642 || GET_CODE (next) == CALL
643 || (GET_CODE (next) == PARALLEL
644 && GET_CODE (XVECEXP (next, 0, 0)) == SET
645 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
646 || (GET_CODE (next) == PARALLEL
647 && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
648 printf (" emit_call_insn (");
649 else if (GET_CODE (next) == CODE_LABEL)
650 printf (" emit_label (");
651 else if (GET_CODE (next) == MATCH_OPERAND
652 || GET_CODE (next) == MATCH_OPERATOR
653 || GET_CODE (next) == MATCH_PARALLEL
654 || GET_CODE (next) == MATCH_OP_DUP
655 || GET_CODE (next) == MATCH_DUP
656 || GET_CODE (next) == PARALLEL)
657 printf (" emit (");
658 else
659 printf (" emit_insn (");
660 gen_exp (next, GET_CODE (split), used);
661 printf (");\n");
662 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
663 && GET_CODE (SET_SRC (next)) == LABEL_REF)
664 printf (" emit_barrier ();");
667 /* Call `gen_sequence' to make a SEQUENCE out of all the
668 insns emitted within this gen_... function. */
670 printf (" _val = gen_sequence ();\n");
671 printf (" end_sequence ();\n");
672 printf (" return _val;\n}\n\n");
674 free (used);
677 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
678 size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
679 the end of the vector. */
681 static void
682 output_add_clobbers ()
684 struct clobber_pat *clobber;
685 struct clobber_ent *ent;
686 int i;
688 printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
689 printf (" rtx pattern ATTRIBUTE_UNUSED;\n int insn_code_number;\n");
690 printf ("{\n");
691 printf (" switch (insn_code_number)\n");
692 printf (" {\n");
694 for (clobber = clobber_list; clobber; clobber = clobber->next)
696 for (ent = clobber->insns; ent; ent = ent->next)
697 printf (" case %d:\n", ent->code_number);
699 for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
701 printf (" XVECEXP (pattern, 0, %d) = ", i);
702 gen_exp (XVECEXP (clobber->pattern, 1, i),
703 GET_CODE (clobber->pattern), NULL);
704 printf (";\n");
707 printf (" break;\n\n");
710 printf (" default:\n");
711 printf (" abort ();\n");
712 printf (" }\n");
713 printf ("}\n");
716 /* Write a function, `added_clobbers_hard_reg_p' this is given an insn_code
717 number that needs clobbers and returns 1 if they include a clobber of a
718 hard reg and 0 if they just clobber SCRATCH. */
720 static void
721 output_added_clobbers_hard_reg_p ()
723 struct clobber_pat *clobber;
724 struct clobber_ent *ent;
725 int clobber_p, used;
727 printf ("\n\nint\nadded_clobbers_hard_reg_p (insn_code_number)\n");
728 printf (" int insn_code_number;\n");
729 printf ("{\n");
730 printf (" switch (insn_code_number)\n");
731 printf (" {\n");
733 for (clobber_p = 0; clobber_p <= 1; clobber_p++)
735 used = 0;
736 for (clobber = clobber_list; clobber; clobber = clobber->next)
737 if (clobber->has_hard_reg == clobber_p)
738 for (ent = clobber->insns; ent; ent = ent->next)
740 printf (" case %d:\n", ent->code_number);
741 used++;
744 if (used)
745 printf (" return %d;\n\n", clobber_p);
748 printf (" default:\n");
749 printf (" abort ();\n");
750 printf (" }\n");
751 printf ("}\n");
754 /* Generate code to invoke find_free_register () as needed for the
755 scratch registers used by the peephole2 pattern in SPLIT. */
757 static void
758 output_peephole2_scratches (split)
759 rtx split;
761 int i;
762 int insn_nr = 0;
764 printf (" HARD_REG_SET _regs_allocated;\n");
765 printf (" CLEAR_HARD_REG_SET (_regs_allocated);\n");
767 for (i = 0; i < XVECLEN (split, 0); i++)
769 rtx elt = XVECEXP (split, 0, i);
770 if (GET_CODE (elt) == MATCH_SCRATCH)
772 int last_insn_nr = insn_nr;
773 int cur_insn_nr = insn_nr;
774 int j;
775 for (j = i + 1; j < XVECLEN (split, 0); j++)
776 if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP)
778 if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0))
779 last_insn_nr = cur_insn_nr;
781 else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH)
782 cur_insn_nr++;
784 printf (" if ((operands[%d] = peep2_find_free_register (%d, %d, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\
785 return NULL;\n",
786 XINT (elt, 0),
787 insn_nr, last_insn_nr,
788 XSTR (elt, 1),
789 GET_MODE_NAME (GET_MODE (elt)));
792 else if (GET_CODE (elt) != MATCH_DUP)
793 insn_nr++;
797 extern int main PARAMS ((int, char **));
800 main (argc, argv)
801 int argc;
802 char **argv;
804 rtx desc;
806 progname = "genemit";
808 if (argc <= 1)
809 fatal ("no input file name");
811 if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
812 return (FATAL_EXIT_CODE);
814 /* Assign sequential codes to all entries in the machine description
815 in parallel with the tables in insn-output.c. */
817 insn_code_number = 0;
818 insn_index_number = 0;
820 printf ("/* Generated automatically by the program `genemit'\n\
821 from the machine description file `md'. */\n\n");
823 printf ("#include \"config.h\"\n");
824 printf ("#include \"system.h\"\n");
825 printf ("#include \"rtl.h\"\n");
826 printf ("#include \"tm_p.h\"\n");
827 printf ("#include \"function.h\"\n");
828 printf ("#include \"expr.h\"\n");
829 printf ("#include \"optabs.h\"\n");
830 printf ("#include \"real.h\"\n");
831 printf ("#include \"flags.h\"\n");
832 printf ("#include \"output.h\"\n");
833 printf ("#include \"insn-config.h\"\n");
834 printf ("#include \"hard-reg-set.h\"\n");
835 printf ("#include \"recog.h\"\n");
836 printf ("#include \"resource.h\"\n");
837 printf ("#include \"reload.h\"\n");
838 printf ("#include \"toplev.h\"\n");
839 printf ("#include \"ggc.h\"\n\n");
840 printf ("#define FAIL return (end_sequence (), _val)\n");
841 printf ("#define DONE return (_val = gen_sequence (), end_sequence (), _val)\n");
843 /* Read the machine description. */
845 while (1)
847 int line_no;
849 desc = read_md_rtx (&line_no, &insn_code_number);
850 if (desc == NULL)
851 break;
853 switch (GET_CODE (desc))
855 case DEFINE_INSN:
856 gen_insn (desc);
857 break;
859 case DEFINE_EXPAND:
860 gen_expand (desc);
861 break;
863 case DEFINE_SPLIT:
864 gen_split (desc);
865 break;
867 case DEFINE_PEEPHOLE2:
868 gen_split (desc);
869 break;
871 default:
872 break;
874 ++insn_index_number;
877 /* Write out the routines to add CLOBBERs to a pattern and say whether they
878 clobber a hard reg. */
879 output_add_clobbers ();
880 output_added_clobbers_hard_reg_p ();
882 fflush (stdout);
883 return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
886 /* Define this so we can link with print-rtl.o to get debug_rtx function. */
887 const char *
888 get_insn_name (code)
889 int code ATTRIBUTE_UNUSED;
891 return NULL;