1 /* Generate code from machine description to perform peephole optimizations.
2 Copyright (C) 1987, 1989, 1992, 1997, 1998, 1999, 2000, 2003, 2004,
3 2007, 2010 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 3, or (at your option) any later
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
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
28 #include "gensupport.h"
31 /* While tree-walking an instruction pattern, we keep a chain
32 of these `struct link's to record how to get down to the
33 current position. In each one, POS is the operand number,
34 and if the operand is a vector VEC is the element number.
35 VEC is -1 if the operand is not a vector. */
46 /* Number of operands used in current peephole definition. */
48 static int n_operands
;
50 /* Peephole optimizations get insn codes just like insn patterns.
51 Count them so we know the code of the define_peephole we are handling. */
53 static int insn_code_number
= 0;
55 static void gen_peephole (rtx
);
56 static void match_rtx (rtx
, struct link
*, int);
57 static void print_path (struct link
*);
58 static void print_code (RTX_CODE
);
61 gen_peephole (rtx peep
)
63 int ninsns
= XVECLEN (peep
, 0);
68 printf (" insn = ins1;\n");
70 for (i
= 0; i
< ninsns
; i
++)
74 printf (" do { insn = NEXT_INSN (insn);\n");
75 printf (" if (insn == 0) goto L%d; }\n",
77 printf (" while (NOTE_P (insn)\n");
78 printf ("\t || (NONJUMP_INSN_P (insn)\n");
79 printf ("\t && (GET_CODE (PATTERN (insn)) == USE\n");
80 printf ("\t\t || GET_CODE (PATTERN (insn)) == CLOBBER)));\n");
82 printf (" if (LABEL_P (insn)\n\
83 || BARRIER_P (insn))\n goto L%d;\n",
87 printf (" pat = PATTERN (insn);\n");
89 /* Walk the insn's pattern, remembering at all times the path
90 down to the walking point. */
92 match_rtx (XVECEXP (peep
, 0, i
), NULL
, insn_code_number
);
95 /* We get this far if the pattern matches.
96 Now test the extra condition. */
98 if (XSTR (peep
, 1) && XSTR (peep
, 1)[0])
99 printf (" if (! (%s)) goto L%d;\n",
100 XSTR (peep
, 1), insn_code_number
);
102 /* If that matches, construct new pattern and put it in the first insn.
103 This new pattern will never be matched.
104 It exists only so that insn-extract can get the operands back.
105 So use a simple regular form: a PARALLEL containing a vector
106 of all the operands. */
108 printf (" PATTERN (ins1) = gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (%d, operands));\n", n_operands
);
110 /* Record this define_peephole's insn code in the insn,
111 as if it had been recognized to match this. */
112 printf (" INSN_CODE (ins1) = %d;\n",
115 /* Delete the remaining insns. */
117 printf (" delete_for_peephole (NEXT_INSN (ins1), insn);\n");
119 /* See reload1.c for insertion of NOTE which guarantees that this
121 printf (" return NEXT_INSN (insn);\n");
123 printf (" L%d:\n\n", insn_code_number
);
127 match_rtx (rtx x
, struct link
*path
, int fail_label
)
144 if (XINT (x
, 0) > max_opno
)
145 max_opno
= XINT (x
, 0);
146 if (XINT (x
, 0) >= n_operands
)
147 n_operands
= 1 + XINT (x
, 0);
153 printf (" operands[%d] = x;\n", XINT (x
, 0));
154 if (XSTR (x
, 1) && XSTR (x
, 1)[0])
155 printf (" if (! %s (x, %smode)) goto L%d;\n",
156 XSTR (x
, 1), GET_MODE_NAME (GET_MODE (x
)), fail_label
);
165 printf (" if (!rtx_equal_p (operands[%d], x)) goto L%d;\n",
166 XINT (x
, 0), fail_label
);
174 printf (" if (GET_CODE (operands[%d]) != GET_CODE (x)\n", XINT (x
, 0));
175 printf (" || GET_MODE (operands[%d]) != GET_MODE (x)) goto L%d;\n",
176 XINT (x
, 0), fail_label
);
177 printf (" operands[%d] = x;\n", XINT (x
, 0));
180 for (i
= 0; i
< XVECLEN (x
, 1); i
++)
183 match_rtx (XVECEXP (x
, 1, i
), &link
, fail_label
);
188 if (XINT (x
, 0) > max_opno
)
189 max_opno
= XINT (x
, 0);
190 if (XINT (x
, 0) >= n_operands
)
191 n_operands
= 1 + XINT (x
, 0);
197 printf (" operands[%d] = x;\n", XINT (x
, 0));
198 if (XSTR (x
, 1) && XSTR (x
, 1)[0])
199 printf (" if (! %s (x, %smode)) goto L%d;\n",
200 XSTR (x
, 1), GET_MODE_NAME (GET_MODE (x
)), fail_label
);
203 for (i
= 0; i
< XVECLEN (x
, 2); i
++)
206 match_rtx (XVECEXP (x
, 2, i
), &link
, fail_label
);
211 if (XINT (x
, 0) > max_opno
)
212 max_opno
= XINT (x
, 0);
213 if (XINT (x
, 0) >= n_operands
)
214 n_operands
= 1 + XINT (x
, 0);
220 printf (" if (GET_CODE (x) != PARALLEL) goto L%d;\n", fail_label
);
221 printf (" operands[%d] = x;\n", XINT (x
, 0));
222 if (XSTR (x
, 1) && XSTR (x
, 1)[0])
223 printf (" if (! %s (x, %smode)) goto L%d;\n",
224 XSTR (x
, 1), GET_MODE_NAME (GET_MODE (x
)), fail_label
);
227 for (i
= 0; i
< XVECLEN (x
, 2); i
++)
230 match_rtx (XVECEXP (x
, 2, i
), &link
, fail_label
);
242 printf (" if (GET_CODE (x) != ");
244 printf (") goto L%d;\n", fail_label
);
246 if (GET_MODE (x
) != VOIDmode
)
248 printf (" if (GET_MODE (x) != %smode) goto L%d;\n",
249 GET_MODE_NAME (GET_MODE (x
)), fail_label
);
254 fmt
= GET_RTX_FORMAT (code
);
255 len
= GET_RTX_LENGTH (code
);
256 for (i
= 0; i
< len
; i
++)
259 if (fmt
[i
] == 'e' || fmt
[i
] == 'u')
260 match_rtx (XEXP (x
, i
), &link
, fail_label
);
261 else if (fmt
[i
] == 'E')
264 printf (" if (XVECLEN (x, %d) != %d) goto L%d;\n",
265 i
, XVECLEN (x
, i
), fail_label
);
266 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
269 match_rtx (XVECEXP (x
, i
, j
), &link
, fail_label
);
272 else if (fmt
[i
] == 'i')
274 /* Make sure that at run time `x' is the RTX we want to test. */
282 printf (" if (XINT (x, %d) != %d) goto L%d;\n",
283 i
, XINT (x
, i
), fail_label
);
285 else if (fmt
[i
] == 'w')
287 /* Make sure that at run time `x' is the RTX we want to test. */
295 printf (" if (XWINT (x, %d) != ", i
);
296 printf (HOST_WIDE_INT_PRINT_DEC
, XWINT (x
, i
));
297 printf (") goto L%d;\n", fail_label
);
299 else if (fmt
[i
] == 's')
301 /* Make sure that at run time `x' is the RTX we want to test. */
309 printf (" if (strcmp (XSTR (x, %d), \"%s\")) goto L%d;\n",
310 i
, XSTR (x
, i
), fail_label
);
315 /* Given a PATH, representing a path down the instruction's
316 pattern from the root to a certain point, output code to
317 evaluate to the rtx at that point. */
320 print_path (struct link
*path
)
324 else if (path
->vecelt
>= 0)
326 printf ("XVECEXP (");
327 print_path (path
->next
);
328 printf (", %d, %d)", path
->pos
, path
->vecelt
);
333 print_path (path
->next
);
334 printf (", %d)", path
->pos
);
339 print_code (RTX_CODE code
)
342 for (p1
= GET_RTX_NAME (code
); *p1
; p1
++)
343 putchar (TOUPPER(*p1
));
346 extern int main (int, char **);
349 main (int argc
, char **argv
)
355 progname
= "genpeep";
357 if (!init_rtx_reader_args (argc
, argv
))
358 return (FATAL_EXIT_CODE
);
360 printf ("/* Generated automatically by the program `genpeep'\n\
361 from the machine description file `md'. */\n\n");
363 printf ("#include \"config.h\"\n");
364 printf ("#include \"system.h\"\n");
365 printf ("#include \"coretypes.h\"\n");
366 printf ("#include \"tm.h\"\n");
367 printf ("#include \"insn-config.h\"\n");
368 printf ("#include \"rtl.h\"\n");
369 printf ("#include \"tm_p.h\"\n");
370 printf ("#include \"regs.h\"\n");
371 printf ("#include \"output.h\"\n");
372 printf ("#include \"recog.h\"\n");
373 printf ("#include \"except.h\"\n");
374 printf ("#include \"function.h\"\n");
375 printf ("#include \"diagnostic-core.h\"\n");
376 printf ("#include \"flags.h\"\n");
377 printf ("#include \"tm-constrs.h\"\n\n");
379 printf ("#ifdef HAVE_peephole\n");
380 printf ("extern rtx peep_operand[];\n\n");
381 printf ("#define operands peep_operand\n\n");
383 printf ("rtx\npeephole (rtx ins1)\n{\n");
384 printf (" rtx insn ATTRIBUTE_UNUSED, x ATTRIBUTE_UNUSED, pat ATTRIBUTE_UNUSED;\n\n");
386 /* Early out: no peepholes for insns followed by barriers. */
387 printf (" if (NEXT_INSN (ins1)\n");
388 printf (" && BARRIER_P (NEXT_INSN (ins1)))\n");
389 printf (" return 0;\n\n");
391 /* Read the machine description. */
395 int line_no
, rtx_number
= 0;
397 desc
= read_md_rtx (&line_no
, &rtx_number
);
401 if (GET_CODE (desc
) == DEFINE_PEEPHOLE
)
406 if (GET_CODE (desc
) == DEFINE_INSN
407 || GET_CODE (desc
) == DEFINE_EXPAND
408 || GET_CODE (desc
) == DEFINE_SPLIT
409 || GET_CODE (desc
) == DEFINE_PEEPHOLE2
)
415 printf (" return 0;\n}\n\n");
420 printf ("rtx peep_operand[%d];\n", max_opno
+ 1);
424 return (ferror (stdout
) != 0 ? FATAL_EXIT_CODE
: SUCCESS_EXIT_CODE
);