Daily bump.
[official-gcc.git] / gcc / genpeep.c
blob036f68812d17180901bfa641d5ea9e3ceb976d06
1 /* Generate code from machine description to perform peephole optimizations.
2 Copyright (C) 1987, 1989, 1992, 1997, 1998,
3 1999, 2000 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 /* While tree-walking an instruction pattern, we keep a chain
31 of these `struct link's to record how to get down to the
32 current position. In each one, POS is the operand number,
33 and if the operand is a vector VEC is the element number.
34 VEC is -1 if the operand is not a vector. */
36 struct link
38 struct link *next;
39 int pos;
40 int vecelt;
43 static int max_opno;
45 /* Number of operands used in current peephole definition. */
47 static int n_operands;
49 /* Peephole optimizations get insn codes just like insn patterns.
50 Count them so we know the code of the define_peephole we are handling. */
52 static int insn_code_number = 0;
54 static void gen_peephole PARAMS ((rtx));
55 static void match_rtx PARAMS ((rtx, struct link *, int));
56 static void print_path PARAMS ((struct link *));
57 static void print_code PARAMS ((RTX_CODE));
59 static void
60 gen_peephole (peep)
61 rtx peep;
63 int ninsns = XVECLEN (peep, 0);
64 int i;
66 n_operands = 0;
68 printf (" insn = ins1;\n");
69 #if 0
70 printf (" want_jump = 0;\n");
71 #endif
73 for (i = 0; i < ninsns; i++)
75 if (i > 0)
77 printf (" do { insn = NEXT_INSN (insn);\n");
78 printf (" if (insn == 0) goto L%d; }\n",
79 insn_code_number);
80 printf (" while (GET_CODE (insn) == NOTE\n");
81 printf ("\t || (GET_CODE (insn) == INSN\n");
82 printf ("\t && (GET_CODE (PATTERN (insn)) == USE\n");
83 printf ("\t\t || GET_CODE (PATTERN (insn)) == CLOBBER)));\n");
85 printf (" if (GET_CODE (insn) == CODE_LABEL\n\
86 || GET_CODE (insn) == BARRIER)\n goto L%d;\n",
87 insn_code_number);
90 #if 0
91 printf (" if (GET_CODE (insn) == JUMP_INSN)\n");
92 printf (" want_jump = JUMP_LABEL (insn);\n");
93 #endif
95 printf (" pat = PATTERN (insn);\n");
97 /* Walk the insn's pattern, remembering at all times the path
98 down to the walking point. */
100 match_rtx (XVECEXP (peep, 0, i), NULL, insn_code_number);
103 /* We get this far if the pattern matches.
104 Now test the extra condition. */
106 if (XSTR (peep, 1) && XSTR (peep, 1)[0])
107 printf (" if (! (%s)) goto L%d;\n",
108 XSTR (peep, 1), insn_code_number);
110 /* If that matches, construct new pattern and put it in the first insn.
111 This new pattern will never be matched.
112 It exists only so that insn-extract can get the operands back.
113 So use a simple regular form: a PARALLEL containing a vector
114 of all the operands. */
116 printf (" PATTERN (ins1) = gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (%d, operands));\n", n_operands);
118 #if 0
119 printf (" if (want_jump && GET_CODE (ins1) != JUMP_INSN)\n");
120 printf (" {\n");
121 printf (" rtx insn2 = emit_jump_insn_before (PATTERN (ins1), ins1);\n");
122 printf (" delete_related_insns (ins1);\n");
123 printf (" ins1 = ins2;\n");
124 printf (" }\n");
125 #endif
127 /* Record this define_peephole's insn code in the insn,
128 as if it had been recognized to match this. */
129 printf (" INSN_CODE (ins1) = %d;\n",
130 insn_code_number);
132 /* Delete the remaining insns. */
133 if (ninsns > 1)
134 printf (" delete_for_peephole (NEXT_INSN (ins1), insn);\n");
136 /* See reload1.c for insertion of NOTE which guarantees that this
137 cannot be zero. */
138 printf (" return NEXT_INSN (insn);\n");
140 printf (" L%d:\n\n", insn_code_number);
143 static void
144 match_rtx (x, path, fail_label)
145 rtx x;
146 struct link *path;
147 int fail_label;
149 RTX_CODE code;
150 int i;
151 int len;
152 const char *fmt;
153 struct link link;
155 if (x == 0)
156 return;
159 code = GET_CODE (x);
161 switch (code)
163 case MATCH_OPERAND:
164 if (XINT (x, 0) > max_opno)
165 max_opno = XINT (x, 0);
166 if (XINT (x, 0) >= n_operands)
167 n_operands = 1 + XINT (x, 0);
169 printf (" x = ");
170 print_path (path);
171 printf (";\n");
173 printf (" operands[%d] = x;\n", XINT (x, 0));
174 if (XSTR (x, 1) && XSTR (x, 1)[0])
175 printf (" if (! %s (x, %smode)) goto L%d;\n",
176 XSTR (x, 1), GET_MODE_NAME (GET_MODE (x)), fail_label);
177 return;
179 case MATCH_DUP:
180 case MATCH_PAR_DUP:
181 printf (" x = ");
182 print_path (path);
183 printf (";\n");
185 printf (" if (!rtx_equal_p (operands[%d], x)) goto L%d;\n",
186 XINT (x, 0), fail_label);
187 return;
189 case MATCH_OP_DUP:
190 printf (" x = ");
191 print_path (path);
192 printf (";\n");
194 printf (" if (GET_CODE (operands[%d]) != GET_CODE (x)\n", XINT (x, 0));
195 printf (" || GET_MODE (operands[%d]) != GET_MODE (x)) goto L%d;\n",
196 XINT (x, 0), fail_label);
197 printf (" operands[%d] = x;\n", XINT (x, 0));
198 link.next = path;
199 link.vecelt = -1;
200 for (i = 0; i < XVECLEN (x, 1); i++)
202 link.pos = i;
203 match_rtx (XVECEXP (x, 1, i), &link, fail_label);
205 return;
207 case MATCH_OPERATOR:
208 if (XINT (x, 0) > max_opno)
209 max_opno = XINT (x, 0);
210 if (XINT (x, 0) >= n_operands)
211 n_operands = 1 + XINT (x, 0);
213 printf (" x = ");
214 print_path (path);
215 printf (";\n");
217 printf (" operands[%d] = x;\n", XINT (x, 0));
218 if (XSTR (x, 1) && XSTR (x, 1)[0])
219 printf (" if (! %s (x, %smode)) goto L%d;\n",
220 XSTR (x, 1), GET_MODE_NAME (GET_MODE (x)), fail_label);
221 link.next = path;
222 link.vecelt = -1;
223 for (i = 0; i < XVECLEN (x, 2); i++)
225 link.pos = i;
226 match_rtx (XVECEXP (x, 2, i), &link, fail_label);
228 return;
230 case MATCH_PARALLEL:
231 if (XINT (x, 0) > max_opno)
232 max_opno = XINT (x, 0);
233 if (XINT (x, 0) >= n_operands)
234 n_operands = 1 + XINT (x, 0);
236 printf (" x = ");
237 print_path (path);
238 printf (";\n");
240 printf (" if (GET_CODE (x) != PARALLEL) goto L%d;\n", fail_label);
241 printf (" operands[%d] = x;\n", XINT (x, 0));
242 if (XSTR (x, 1) && XSTR (x, 1)[0])
243 printf (" if (! %s (x, %smode)) goto L%d;\n",
244 XSTR (x, 1), GET_MODE_NAME (GET_MODE (x)), fail_label);
245 link.next = path;
246 link.pos = 0;
247 for (i = 0; i < XVECLEN (x, 2); i++)
249 link.vecelt = i;
250 match_rtx (XVECEXP (x, 2, i), &link, fail_label);
252 return;
254 case ADDRESS:
255 match_rtx (XEXP (x, 0), path, fail_label);
256 return;
258 default:
259 break;
262 printf (" x = ");
263 print_path (path);
264 printf (";\n");
266 printf (" if (GET_CODE (x) != ");
267 print_code (code);
268 printf (") goto L%d;\n", fail_label);
270 if (GET_MODE (x) != VOIDmode)
272 printf (" if (GET_MODE (x) != %smode) goto L%d;\n",
273 GET_MODE_NAME (GET_MODE (x)), fail_label);
276 link.next = path;
277 link.vecelt = -1;
278 fmt = GET_RTX_FORMAT (code);
279 len = GET_RTX_LENGTH (code);
280 for (i = 0; i < len; i++)
282 link.pos = i;
283 if (fmt[i] == 'e' || fmt[i] == 'u')
284 match_rtx (XEXP (x, i), &link, fail_label);
285 else if (fmt[i] == 'E')
287 int j;
288 printf (" if (XVECLEN (x, %d) != %d) goto L%d;\n",
289 i, XVECLEN (x, i), fail_label);
290 for (j = 0; j < XVECLEN (x, i); j++)
292 link.vecelt = j;
293 match_rtx (XVECEXP (x, i, j), &link, fail_label);
296 else if (fmt[i] == 'i')
298 /* Make sure that at run time `x' is the RTX we want to test. */
299 if (i != 0)
301 printf (" x = ");
302 print_path (path);
303 printf (";\n");
306 printf (" if (XINT (x, %d) != %d) goto L%d;\n",
307 i, XINT (x, i), fail_label);
309 else if (fmt[i] == 'w')
311 /* Make sure that at run time `x' is the RTX we want to test. */
312 if (i != 0)
314 printf (" x = ");
315 print_path (path);
316 printf (";\n");
319 printf (" if (XWINT (x, %d) != ", i);
320 printf (HOST_WIDE_INT_PRINT_DEC, XWINT (x, i));
321 printf (") goto L%d;\n", fail_label);
323 else if (fmt[i] == 's')
325 /* Make sure that at run time `x' is the RTX we want to test. */
326 if (i != 0)
328 printf (" x = ");
329 print_path (path);
330 printf (";\n");
333 printf (" if (strcmp (XSTR (x, %d), \"%s\")) goto L%d;\n",
334 i, XSTR (x, i), fail_label);
339 /* Given a PATH, representing a path down the instruction's
340 pattern from the root to a certain point, output code to
341 evaluate to the rtx at that point. */
343 static void
344 print_path (path)
345 struct link *path;
347 if (path == 0)
348 printf ("pat");
349 else if (path->vecelt >= 0)
351 printf ("XVECEXP (");
352 print_path (path->next);
353 printf (", %d, %d)", path->pos, path->vecelt);
355 else
357 printf ("XEXP (");
358 print_path (path->next);
359 printf (", %d)", path->pos);
363 static void
364 print_code (code)
365 RTX_CODE code;
367 const char *p1;
368 for (p1 = GET_RTX_NAME (code); *p1; p1++)
369 putchar (TOUPPER(*p1));
372 extern int main PARAMS ((int, char **));
375 main (argc, argv)
376 int argc;
377 char **argv;
379 rtx desc;
381 max_opno = -1;
383 progname = "genpeep";
385 if (argc <= 1)
386 fatal ("no input file name");
388 if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
389 return (FATAL_EXIT_CODE);
391 printf ("/* Generated automatically by the program `genpeep'\n\
392 from the machine description file `md'. */\n\n");
394 printf ("#include \"config.h\"\n");
395 printf ("#include \"system.h\"\n");
396 printf ("#include \"insn-config.h\"\n");
397 printf ("#include \"rtl.h\"\n");
398 printf ("#include \"tm_p.h\"\n");
399 printf ("#include \"regs.h\"\n");
400 printf ("#include \"output.h\"\n");
401 printf ("#include \"real.h\"\n");
402 printf ("#include \"recog.h\"\n");
403 printf ("#include \"except.h\"\n\n");
404 printf ("#include \"function.h\"\n\n");
406 printf ("#ifdef HAVE_peephole\n");
407 printf ("extern rtx peep_operand[];\n\n");
408 printf ("#define operands peep_operand\n\n");
410 printf ("rtx\npeephole (ins1)\n rtx ins1;\n{\n");
411 printf (" rtx insn ATTRIBUTE_UNUSED, x ATTRIBUTE_UNUSED, pat ATTRIBUTE_UNUSED;\n\n");
413 /* Early out: no peepholes for insns followed by barriers. */
414 printf (" if (NEXT_INSN (ins1)\n");
415 printf (" && GET_CODE (NEXT_INSN (ins1)) == BARRIER)\n");
416 printf (" return 0;\n\n");
418 /* Read the machine description. */
420 while (1)
422 int line_no, rtx_number = 0;
424 desc = read_md_rtx (&line_no, &rtx_number);
425 if (desc == NULL)
426 break;
428 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
430 gen_peephole (desc);
431 insn_code_number++;
433 if (GET_CODE (desc) == DEFINE_INSN
434 || GET_CODE (desc) == DEFINE_EXPAND
435 || GET_CODE (desc) == DEFINE_SPLIT
436 || GET_CODE (desc) == DEFINE_PEEPHOLE2)
438 insn_code_number++;
442 printf (" return 0;\n}\n\n");
444 if (max_opno == -1)
445 max_opno = 1;
447 printf ("rtx peep_operand[%d];\n", max_opno + 1);
448 printf ("#endif\n");
450 fflush (stdout);
451 return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
454 /* Define this so we can link with print-rtl.o to get debug_rtx function. */
455 const char *
456 get_insn_name (code)
457 int code ATTRIBUTE_UNUSED;
459 return NULL;