* configure.in: Add ${libgcj} to noconfigdirs for xtensa-*-* targets.
[official-gcc.git] / gcc / genemit.c
blobea787d24c003416741689404b216eb5db5b5f6b4
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 2003 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 "bconfig.h"
24 #include "system.h"
25 #include "coretypes.h"
26 #include "tm.h"
27 #include "rtl.h"
28 #include "errors.h"
29 #include "gensupport.h"
32 static int max_opno;
33 static int max_dup_opno;
34 static int max_scratch_opno;
35 static int register_constraints;
36 static int insn_code_number;
37 static int insn_index_number;
39 /* Data structure for recording the patterns of insns that have CLOBBERs.
40 We use this to output a function that adds these CLOBBERs to a
41 previously-allocated PARALLEL expression. */
43 struct clobber_pat
45 struct clobber_ent *insns;
46 rtx pattern;
47 int first_clobber;
48 struct clobber_pat *next;
49 int has_hard_reg;
50 } *clobber_list;
52 /* Records one insn that uses the clobber list. */
54 struct clobber_ent
56 int code_number; /* Counts only insns. */
57 struct clobber_ent *next;
60 static void max_operand_1 (rtx);
61 static int max_operand_vec (rtx, int);
62 static void print_code (RTX_CODE);
63 static void gen_exp (rtx, enum rtx_code, char *);
64 static void gen_insn (rtx, int);
65 static void gen_expand (rtx);
66 static void gen_split (rtx);
67 static void output_add_clobbers (void);
68 static void output_added_clobbers_hard_reg_p (void);
69 static void gen_rtx_scratch (rtx, enum rtx_code);
70 static void output_peephole2_scratches (rtx);
73 static void
74 max_operand_1 (rtx x)
76 RTX_CODE code;
77 int i;
78 int len;
79 const char *fmt;
81 if (x == 0)
82 return;
84 code = GET_CODE (x);
86 if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
87 register_constraints = 1;
88 if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
89 register_constraints = 1;
90 if (code == MATCH_OPERAND || code == MATCH_OPERATOR
91 || code == MATCH_PARALLEL)
92 max_opno = MAX (max_opno, XINT (x, 0));
93 if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
94 max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
95 if (code == MATCH_SCRATCH)
96 max_scratch_opno = MAX (max_scratch_opno, XINT (x, 0));
98 fmt = GET_RTX_FORMAT (code);
99 len = GET_RTX_LENGTH (code);
100 for (i = 0; i < len; i++)
102 if (fmt[i] == 'e' || fmt[i] == 'u')
103 max_operand_1 (XEXP (x, i));
104 else if (fmt[i] == 'E')
106 int j;
107 for (j = 0; j < XVECLEN (x, i); j++)
108 max_operand_1 (XVECEXP (x, i, j));
113 static int
114 max_operand_vec (rtx insn, int arg)
116 int len = XVECLEN (insn, arg);
117 int i;
119 max_opno = -1;
120 max_dup_opno = -1;
121 max_scratch_opno = -1;
123 for (i = 0; i < len; i++)
124 max_operand_1 (XVECEXP (insn, arg, i));
126 return max_opno + 1;
129 static void
130 print_code (RTX_CODE code)
132 const char *p1;
133 for (p1 = GET_RTX_NAME (code); *p1; p1++)
134 putchar (TOUPPER(*p1));
137 static void
138 gen_rtx_scratch (rtx x, enum rtx_code subroutine_type)
140 if (subroutine_type == DEFINE_PEEPHOLE2)
142 printf ("operand%d", XINT (x, 0));
144 else
146 printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
150 /* Print a C expression to construct an RTX just like X,
151 substituting any operand references appearing within. */
153 static void
154 gen_exp (rtx x, enum rtx_code subroutine_type, char *used)
156 RTX_CODE code;
157 int i;
158 int len;
159 const char *fmt;
161 if (x == 0)
163 printf ("NULL_RTX");
164 return;
167 code = GET_CODE (x);
169 switch (code)
171 case MATCH_OPERAND:
172 case MATCH_DUP:
173 if (used)
175 if (used[XINT (x, 0)])
177 printf ("copy_rtx (operand%d)", XINT (x, 0));
178 return;
180 used[XINT (x, 0)] = 1;
182 printf ("operand%d", XINT (x, 0));
183 return;
185 case MATCH_OP_DUP:
186 printf ("gen_rtx (GET_CODE (operand%d), ", XINT (x, 0));
187 if (GET_MODE (x) == VOIDmode)
188 printf ("GET_MODE (operand%d)", XINT (x, 0));
189 else
190 printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
191 for (i = 0; i < XVECLEN (x, 1); i++)
193 printf (",\n\t\t");
194 gen_exp (XVECEXP (x, 1, i), subroutine_type, used);
196 printf (")");
197 return;
199 case MATCH_OPERATOR:
200 printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
201 printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
202 for (i = 0; i < XVECLEN (x, 2); i++)
204 printf (",\n\t\t");
205 gen_exp (XVECEXP (x, 2, i), subroutine_type, used);
207 printf (")");
208 return;
210 case MATCH_PARALLEL:
211 case MATCH_PAR_DUP:
212 printf ("operand%d", XINT (x, 0));
213 return;
215 case MATCH_SCRATCH:
216 gen_rtx_scratch (x, subroutine_type);
217 return;
219 case ADDRESS:
220 fatal ("ADDRESS expression code used in named instruction pattern");
222 case PC:
223 printf ("pc_rtx");
224 return;
226 case CC0:
227 printf ("cc0_rtx");
228 return;
230 case CONST_INT:
231 if (INTVAL (x) == 0)
232 printf ("const0_rtx");
233 else if (INTVAL (x) == 1)
234 printf ("const1_rtx");
235 else if (INTVAL (x) == -1)
236 printf ("constm1_rtx");
237 else if (INTVAL (x) == STORE_FLAG_VALUE)
238 printf ("const_true_rtx");
239 else
241 printf ("GEN_INT (");
242 printf (HOST_WIDE_INT_PRINT_DEC_C, INTVAL (x));
243 printf (")");
245 return;
247 case CONST_DOUBLE:
248 /* These shouldn't be written in MD files. Instead, the appropriate
249 routines in varasm.c should be called. */
250 abort ();
252 default:
253 break;
256 printf ("gen_rtx_");
257 print_code (code);
258 printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
260 fmt = GET_RTX_FORMAT (code);
261 len = GET_RTX_LENGTH (code);
262 for (i = 0; i < len; i++)
264 if (fmt[i] == '0')
265 break;
266 printf (",\n\t");
267 if (fmt[i] == 'e' || fmt[i] == 'u')
268 gen_exp (XEXP (x, i), subroutine_type, used);
269 else if (fmt[i] == 'i')
270 printf ("%u", XINT (x, i));
271 else if (fmt[i] == 's')
272 printf ("\"%s\"", XSTR (x, i));
273 else if (fmt[i] == 'E')
275 int j;
276 printf ("gen_rtvec (%d", XVECLEN (x, i));
277 for (j = 0; j < XVECLEN (x, i); j++)
279 printf (",\n\t\t");
280 gen_exp (XVECEXP (x, i, j), subroutine_type, used);
282 printf (")");
284 else
285 abort ();
287 printf (")");
290 /* Generate the `gen_...' function for a DEFINE_INSN. */
292 static void
293 gen_insn (rtx insn, int lineno)
295 int operands;
296 int i;
298 /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
299 registers or MATCH_SCRATCHes. If so, store away the information for
300 later. */
302 if (XVEC (insn, 1))
304 int has_hard_reg = 0;
306 for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
308 if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER)
309 break;
311 if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) == REG)
312 has_hard_reg = 1;
313 else if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH)
314 break;
317 if (i != XVECLEN (insn, 1) - 1)
319 struct clobber_pat *p;
320 struct clobber_ent *link
321 = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
322 int j;
324 link->code_number = insn_code_number;
326 /* See if any previous CLOBBER_LIST entry is the same as this
327 one. */
329 for (p = clobber_list; p; p = p->next)
331 if (p->first_clobber != i + 1
332 || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
333 continue;
335 for (j = i + 1; j < XVECLEN (insn, 1); j++)
337 rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
338 rtx new = XEXP (XVECEXP (insn, 1, j), 0);
340 /* OLD and NEW are the same if both are to be a SCRATCH
341 of the same mode,
342 or if both are registers of the same mode and number. */
343 if (! (GET_MODE (old) == GET_MODE (new)
344 && ((GET_CODE (old) == MATCH_SCRATCH
345 && GET_CODE (new) == MATCH_SCRATCH)
346 || (GET_CODE (old) == REG && GET_CODE (new) == REG
347 && REGNO (old) == REGNO (new)))))
348 break;
351 if (j == XVECLEN (insn, 1))
352 break;
355 if (p == 0)
357 p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
359 p->insns = 0;
360 p->pattern = insn;
361 p->first_clobber = i + 1;
362 p->next = clobber_list;
363 p->has_hard_reg = has_hard_reg;
364 clobber_list = p;
367 link->next = p->insns;
368 p->insns = link;
372 /* Don't mention instructions whose names are the null string
373 or begin with '*'. They are in the machine description just
374 to be recognized. */
375 if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
376 return;
378 printf ("/* %s:%d */\n", read_rtx_filename, lineno);
380 /* Find out how many operands this function has,
381 and also whether any of them have register constraints. */
382 register_constraints = 0;
383 operands = max_operand_vec (insn, 1);
384 if (max_dup_opno >= operands)
385 fatal ("match_dup operand number has no match_operand");
387 /* Output the function name and argument declarations. */
388 printf ("rtx\ngen_%s (", XSTR (insn, 0));
389 if (operands)
390 for (i = 0; i < operands; i++)
391 if (i)
392 printf (",\n\trtx operand%d ATTRIBUTE_UNUSED", i);
393 else
394 printf ("rtx operand%d ATTRIBUTE_UNUSED", i);
395 else
396 printf ("void");
397 printf (")\n");
398 printf ("{\n");
400 /* Output code to construct and return the rtl for the instruction body */
402 if (XVECLEN (insn, 1) == 1)
404 printf (" return ");
405 gen_exp (XVECEXP (insn, 1, 0), DEFINE_INSN, NULL);
406 printf (";\n}\n\n");
408 else
410 printf (" return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d",
411 XVECLEN (insn, 1));
413 for (i = 0; i < XVECLEN (insn, 1); i++)
415 printf (",\n\t\t");
416 gen_exp (XVECEXP (insn, 1, i), DEFINE_INSN, NULL);
418 printf ("));\n}\n\n");
422 /* Generate the `gen_...' function for a DEFINE_EXPAND. */
424 static void
425 gen_expand (rtx expand)
427 int operands;
428 int i;
430 if (strlen (XSTR (expand, 0)) == 0)
431 fatal ("define_expand lacks a name");
432 if (XVEC (expand, 1) == 0)
433 fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
435 /* Find out how many operands this function has,
436 and also whether any of them have register constraints. */
437 register_constraints = 0;
439 operands = max_operand_vec (expand, 1);
441 /* Output the function name and argument declarations. */
442 printf ("rtx\ngen_%s (", XSTR (expand, 0));
443 if (operands)
444 for (i = 0; i < operands; i++)
445 if (i)
446 printf (",\n\trtx operand%d", i);
447 else
448 printf ("rtx operand%d", i);
449 else
450 printf ("void");
451 printf (")\n");
452 printf ("{\n");
454 /* If we don't have any C code to write, only one insn is being written,
455 and no MATCH_DUPs are present, we can just return the desired insn
456 like we do for a DEFINE_INSN. This saves memory. */
457 if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
458 && operands > max_dup_opno
459 && XVECLEN (expand, 1) == 1)
461 printf (" return ");
462 gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND, NULL);
463 printf (";\n}\n\n");
464 return;
467 /* For each operand referred to only with MATCH_DUPs,
468 make a local variable. */
469 for (i = operands; i <= max_dup_opno; i++)
470 printf (" rtx operand%d;\n", i);
471 for (; i <= max_scratch_opno; i++)
472 printf (" rtx operand%d ATTRIBUTE_UNUSED;\n", i);
473 printf (" rtx _val = 0;\n");
474 printf (" start_sequence ();\n");
476 /* The fourth operand of DEFINE_EXPAND is some code to be executed
477 before the actual construction.
478 This code expects to refer to `operands'
479 just as the output-code in a DEFINE_INSN does,
480 but here `operands' is an automatic array.
481 So copy the operand values there before executing it. */
482 if (XSTR (expand, 3) && *XSTR (expand, 3))
484 printf (" {\n");
485 if (operands > 0 || max_dup_opno >= 0 || max_scratch_opno >= 0)
486 printf (" rtx operands[%d];\n",
487 MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));
488 /* Output code to copy the arguments into `operands'. */
489 for (i = 0; i < operands; i++)
490 printf (" operands[%d] = operand%d;\n", i, i);
492 /* Output the special code to be executed before the sequence
493 is generated. */
494 printf ("%s\n", XSTR (expand, 3));
496 /* Output code to copy the arguments back out of `operands'
497 (unless we aren't going to use them at all). */
498 if (XVEC (expand, 1) != 0)
500 for (i = 0; i < operands; i++)
501 printf (" operand%d = operands[%d];\n", i, i);
502 for (; i <= max_dup_opno; i++)
503 printf (" operand%d = operands[%d];\n", i, i);
504 for (; i <= max_scratch_opno; i++)
505 printf (" operand%d = operands[%d];\n", i, i);
507 printf (" }\n");
510 /* Output code to construct the rtl for the instruction bodies.
511 Use emit_insn to add them to the sequence being accumulated.
512 But don't do this if the user's code has set `no_more' nonzero. */
514 for (i = 0; i < XVECLEN (expand, 1); i++)
516 rtx next = XVECEXP (expand, 1, i);
517 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
518 || (GET_CODE (next) == PARALLEL
519 && ((GET_CODE (XVECEXP (next, 0, 0)) == SET
520 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
521 || GET_CODE (XVECEXP (next, 0, 0)) == RETURN))
522 || GET_CODE (next) == RETURN)
523 printf (" emit_jump_insn (");
524 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
525 || GET_CODE (next) == CALL
526 || (GET_CODE (next) == PARALLEL
527 && GET_CODE (XVECEXP (next, 0, 0)) == SET
528 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
529 || (GET_CODE (next) == PARALLEL
530 && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
531 printf (" emit_call_insn (");
532 else if (GET_CODE (next) == CODE_LABEL)
533 printf (" emit_label (");
534 else if (GET_CODE (next) == MATCH_OPERAND
535 || GET_CODE (next) == MATCH_DUP
536 || GET_CODE (next) == MATCH_OPERATOR
537 || GET_CODE (next) == MATCH_OP_DUP
538 || GET_CODE (next) == MATCH_PARALLEL
539 || GET_CODE (next) == MATCH_PAR_DUP
540 || GET_CODE (next) == PARALLEL)
541 printf (" emit (");
542 else
543 printf (" emit_insn (");
544 gen_exp (next, DEFINE_EXPAND, NULL);
545 printf (");\n");
546 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
547 && GET_CODE (SET_SRC (next)) == LABEL_REF)
548 printf (" emit_barrier ();");
551 /* Call `get_insns' to extract the list of all the
552 insns emitted within this gen_... function. */
554 printf (" _val = get_insns ();\n");
555 printf (" end_sequence ();\n");
556 printf (" return _val;\n}\n\n");
559 /* Like gen_expand, but generates insns resulting from splitting SPLIT. */
561 static void
562 gen_split (rtx split)
564 int i;
565 int operands;
566 const char *const name =
567 ((GET_CODE (split) == DEFINE_PEEPHOLE2) ? "peephole2" : "split");
568 const char *unused;
569 char *used;
571 if (XVEC (split, 0) == 0)
572 fatal ("define_%s (definition %d) lacks a pattern", name,
573 insn_index_number);
574 else if (XVEC (split, 2) == 0)
575 fatal ("define_%s (definition %d) lacks a replacement pattern", name,
576 insn_index_number);
578 /* Find out how many operands this function has. */
580 max_operand_vec (split, 2);
581 operands = MAX (max_opno, MAX (max_dup_opno, max_scratch_opno)) + 1;
582 unused = (operands == 0 ? " ATTRIBUTE_UNUSED" : "");
583 used = xcalloc (1, operands);
585 /* Output the prototype, function name and argument declarations. */
586 if (GET_CODE (split) == DEFINE_PEEPHOLE2)
588 printf ("extern rtx gen_%s_%d (rtx, rtx *);\n",
589 name, insn_code_number);
590 printf ("rtx\ngen_%s_%d (rtx curr_insn ATTRIBUTE_UNUSED, rtx *operands%s)\n",
591 name, insn_code_number, unused);
593 else
595 printf ("extern rtx gen_split_%d (rtx *);\n", insn_code_number);
596 printf ("rtx\ngen_%s_%d (rtx *operands%s)\n", name, insn_code_number, unused);
598 printf ("{\n");
600 /* Declare all local variables. */
601 for (i = 0; i < operands; i++)
602 printf (" rtx operand%d;\n", i);
603 printf (" rtx _val = 0;\n");
605 if (GET_CODE (split) == DEFINE_PEEPHOLE2)
606 output_peephole2_scratches (split);
608 printf (" start_sequence ();\n");
610 /* The fourth operand of DEFINE_SPLIT is some code to be executed
611 before the actual construction. */
613 if (XSTR (split, 3))
614 printf ("%s\n", XSTR (split, 3));
616 /* Output code to copy the arguments back out of `operands' */
617 for (i = 0; i < operands; i++)
618 printf (" operand%d = operands[%d];\n", i, i);
620 /* Output code to construct the rtl for the instruction bodies.
621 Use emit_insn to add them to the sequence being accumulated.
622 But don't do this if the user's code has set `no_more' nonzero. */
624 for (i = 0; i < XVECLEN (split, 2); i++)
626 rtx next = XVECEXP (split, 2, i);
627 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
628 || (GET_CODE (next) == PARALLEL
629 && GET_CODE (XVECEXP (next, 0, 0)) == SET
630 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
631 || GET_CODE (next) == RETURN)
632 printf (" emit_jump_insn (");
633 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
634 || GET_CODE (next) == CALL
635 || (GET_CODE (next) == PARALLEL
636 && GET_CODE (XVECEXP (next, 0, 0)) == SET
637 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
638 || (GET_CODE (next) == PARALLEL
639 && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
640 printf (" emit_call_insn (");
641 else if (GET_CODE (next) == CODE_LABEL)
642 printf (" emit_label (");
643 else if (GET_CODE (next) == MATCH_OPERAND
644 || GET_CODE (next) == MATCH_OPERATOR
645 || GET_CODE (next) == MATCH_PARALLEL
646 || GET_CODE (next) == MATCH_OP_DUP
647 || GET_CODE (next) == MATCH_DUP
648 || GET_CODE (next) == PARALLEL)
649 printf (" emit (");
650 else
651 printf (" emit_insn (");
652 gen_exp (next, GET_CODE (split), used);
653 printf (");\n");
654 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
655 && GET_CODE (SET_SRC (next)) == LABEL_REF)
656 printf (" emit_barrier ();");
659 /* Call `get_insns' to make a list of all the
660 insns emitted within this gen_... function. */
662 printf (" _val = get_insns ();\n");
663 printf (" end_sequence ();\n");
664 printf (" return _val;\n}\n\n");
666 free (used);
669 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
670 size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
671 the end of the vector. */
673 static void
674 output_add_clobbers (void)
676 struct clobber_pat *clobber;
677 struct clobber_ent *ent;
678 int i;
680 printf ("\n\nvoid\nadd_clobbers (rtx pattern ATTRIBUTE_UNUSED, int insn_code_number)\n");
681 printf ("{\n");
682 printf (" switch (insn_code_number)\n");
683 printf (" {\n");
685 for (clobber = clobber_list; clobber; clobber = clobber->next)
687 for (ent = clobber->insns; ent; ent = ent->next)
688 printf (" case %d:\n", ent->code_number);
690 for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
692 printf (" XVECEXP (pattern, 0, %d) = ", i);
693 gen_exp (XVECEXP (clobber->pattern, 1, i),
694 GET_CODE (clobber->pattern), NULL);
695 printf (";\n");
698 printf (" break;\n\n");
701 printf (" default:\n");
702 printf (" abort ();\n");
703 printf (" }\n");
704 printf ("}\n");
707 /* Write a function, `added_clobbers_hard_reg_p' this is given an insn_code
708 number that needs clobbers and returns 1 if they include a clobber of a
709 hard reg and 0 if they just clobber SCRATCH. */
711 static void
712 output_added_clobbers_hard_reg_p (void)
714 struct clobber_pat *clobber;
715 struct clobber_ent *ent;
716 int clobber_p, used;
718 printf ("\n\nint\nadded_clobbers_hard_reg_p (int insn_code_number)\n");
719 printf ("{\n");
720 printf (" switch (insn_code_number)\n");
721 printf (" {\n");
723 for (clobber_p = 0; clobber_p <= 1; clobber_p++)
725 used = 0;
726 for (clobber = clobber_list; clobber; clobber = clobber->next)
727 if (clobber->has_hard_reg == clobber_p)
728 for (ent = clobber->insns; ent; ent = ent->next)
730 printf (" case %d:\n", ent->code_number);
731 used++;
734 if (used)
735 printf (" return %d;\n\n", clobber_p);
738 printf (" default:\n");
739 printf (" abort ();\n");
740 printf (" }\n");
741 printf ("}\n");
744 /* Generate code to invoke find_free_register () as needed for the
745 scratch registers used by the peephole2 pattern in SPLIT. */
747 static void
748 output_peephole2_scratches (rtx split)
750 int i;
751 int insn_nr = 0;
753 printf (" HARD_REG_SET _regs_allocated;\n");
754 printf (" CLEAR_HARD_REG_SET (_regs_allocated);\n");
756 for (i = 0; i < XVECLEN (split, 0); i++)
758 rtx elt = XVECEXP (split, 0, i);
759 if (GET_CODE (elt) == MATCH_SCRATCH)
761 int last_insn_nr = insn_nr;
762 int cur_insn_nr = insn_nr;
763 int j;
764 for (j = i + 1; j < XVECLEN (split, 0); j++)
765 if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP)
767 if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0))
768 last_insn_nr = cur_insn_nr;
770 else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH)
771 cur_insn_nr++;
773 printf (" if ((operands[%d] = peep2_find_free_register (%d, %d, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\
774 return NULL;\n",
775 XINT (elt, 0),
776 insn_nr, last_insn_nr,
777 XSTR (elt, 1),
778 GET_MODE_NAME (GET_MODE (elt)));
781 else if (GET_CODE (elt) != MATCH_DUP)
782 insn_nr++;
787 main (int argc, char **argv)
789 rtx desc;
791 progname = "genemit";
793 if (argc <= 1)
794 fatal ("no input file name");
796 if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
797 return (FATAL_EXIT_CODE);
799 /* Assign sequential codes to all entries in the machine description
800 in parallel with the tables in insn-output.c. */
802 insn_code_number = 0;
803 insn_index_number = 0;
805 printf ("/* Generated automatically by the program `genemit'\n\
806 from the machine description file `md'. */\n\n");
808 printf ("#include \"config.h\"\n");
809 printf ("#include \"system.h\"\n");
810 printf ("#include \"coretypes.h\"\n");
811 printf ("#include \"tm.h\"\n");
812 printf ("#include \"rtl.h\"\n");
813 printf ("#include \"tm_p.h\"\n");
814 printf ("#include \"function.h\"\n");
815 printf ("#include \"expr.h\"\n");
816 printf ("#include \"optabs.h\"\n");
817 printf ("#include \"real.h\"\n");
818 printf ("#include \"flags.h\"\n");
819 printf ("#include \"output.h\"\n");
820 printf ("#include \"insn-config.h\"\n");
821 printf ("#include \"hard-reg-set.h\"\n");
822 printf ("#include \"recog.h\"\n");
823 printf ("#include \"resource.h\"\n");
824 printf ("#include \"reload.h\"\n");
825 printf ("#include \"toplev.h\"\n");
826 printf ("#include \"ggc.h\"\n\n");
827 printf ("#define FAIL return (end_sequence (), _val)\n");
828 printf ("#define DONE return (_val = get_insns (), end_sequence (), _val)\n\n");
830 /* Read the machine description. */
832 while (1)
834 int line_no;
836 desc = read_md_rtx (&line_no, &insn_code_number);
837 if (desc == NULL)
838 break;
840 switch (GET_CODE (desc))
842 case DEFINE_INSN:
843 gen_insn (desc, line_no);
844 break;
846 case DEFINE_EXPAND:
847 printf ("/* %s:%d */\n", read_rtx_filename, line_no);
848 gen_expand (desc);
849 break;
851 case DEFINE_SPLIT:
852 printf ("/* %s:%d */\n", read_rtx_filename, line_no);
853 gen_split (desc);
854 break;
856 case DEFINE_PEEPHOLE2:
857 printf ("/* %s:%d */\n", read_rtx_filename, line_no);
858 gen_split (desc);
859 break;
861 default:
862 break;
864 ++insn_index_number;
867 /* Write out the routines to add CLOBBERs to a pattern and say whether they
868 clobber a hard reg. */
869 output_add_clobbers ();
870 output_added_clobbers_hard_reg_p ();
872 fflush (stdout);
873 return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
876 /* Define this so we can link with print-rtl.o to get debug_rtx function. */
877 const char *
878 get_insn_name (int code ATTRIBUTE_UNUSED)
880 return NULL;