1 /* Generate from machine description:
2 - some #define configuration flags.
3 Copyright (C) 1987-2022 Free Software Foundation, Inc.
4
5 This file is part of GCC.
6
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
10 version.
11
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.
16
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/>. */
20
21
22 #include "bconfig.h"
23 #include "system.h"
24 #include "coretypes.h"
25 #include "tm.h"
26 #include "rtl.h"
27 #include "errors.h"
28 #include "gensupport.h"
29
30
31 /* flags to determine output of machine description dependent #define's. */
32 static int max_recog_operands; /* Largest operand number seen. */
33 static int max_dup_operands; /* Largest number of match_dup in any insn. */
34 static int max_clobbers_per_insn;
35 static int have_cmove_flag;
36 static int have_cond_exec_flag;
37 static int have_lo_sum_flag;
38 static int have_rotate_flag;
39 static int have_rotatert_flag;
40 static int have_peephole_flag;
41 static int have_peephole2_flag;
42
43 /* Maximum number of insns seen in a split. */
44 static int max_insns_per_split = 1;
45
46 /* Maximum number of input insns for peephole2. */
47 static int max_insns_per_peep2;
48
49 static int clobbers_seen_this_insn;
50 static int dup_operands_seen_this_insn;
51
52 static void walk_insn_part (rtx, int, int);
53
54 /* RECOG_P will be nonzero if this pattern was seen in a context where it will
55 be used to recognize, rather than just generate an insn.
56
57 NON_PC_SET_SRC will be nonzero if this pattern was seen in a SET_SRC
58 of a SET whose destination is not (pc). */
59
60 static void
walk_insn_part(rtx part,int recog_p,int non_pc_set_src)61 walk_insn_part (rtx part, int recog_p, int non_pc_set_src)
62 {
63 int i, j;
64 RTX_CODE code;
65 const char *format_ptr;
66
67 if (part == 0)
68 return;
69
70 code = GET_CODE (part);
71 switch (code)
72 {
73 case CLOBBER:
74 clobbers_seen_this_insn++;
75 break;
76
77 case MATCH_OPERAND:
78 if (XINT (part, 0) > max_recog_operands)
79 max_recog_operands = XINT (part, 0);
80 return;
81
82 case MATCH_OP_DUP:
83 case MATCH_PAR_DUP:
84 ++dup_operands_seen_this_insn;
85 /* FALLTHRU */
86 case MATCH_SCRATCH:
87 case MATCH_PARALLEL:
88 case MATCH_OPERATOR:
89 if (XINT (part, 0) > max_recog_operands)
90 max_recog_operands = XINT (part, 0);
91 /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
92 MATCH_PARALLEL. */
93 break;
94
95 case LABEL_REF:
96 if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND
97 || GET_CODE (XEXP (part, 0)) == MATCH_DUP)
98 break;
99 return;
100
101 case MATCH_DUP:
102 ++dup_operands_seen_this_insn;
103 if (XINT (part, 0) > max_recog_operands)
104 max_recog_operands = XINT (part, 0);
105 return;
106
107 case LO_SUM:
108 if (recog_p)
109 have_lo_sum_flag = 1;
110 return;
111
112 case ROTATE:
113 if (recog_p)
114 have_rotate_flag = 1;
115 return;
116
117 case ROTATERT:
118 if (recog_p)
119 have_rotatert_flag = 1;
120 return;
121
122 case SET:
123 walk_insn_part (SET_DEST (part), 0, recog_p);
124 walk_insn_part (SET_SRC (part), recog_p,
125 GET_CODE (SET_DEST (part)) != PC);
126 return;
127
128 case IF_THEN_ELSE:
129 /* Only consider this machine as having a conditional move if the
130 two arms of the IF_THEN_ELSE are both MATCH_OPERAND. Otherwise,
131 we have some specific IF_THEN_ELSE construct (like the doz
132 instruction on the RS/6000) that can't be used in the general
133 context we want it for. */
134
135 if (recog_p && non_pc_set_src
136 && GET_CODE (XEXP (part, 1)) == MATCH_OPERAND
137 && GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)
138 have_cmove_flag = 1;
139 break;
140
141 case COND_EXEC:
142 if (recog_p)
143 have_cond_exec_flag = 1;
144 break;
145
146 case REG: case CONST_INT: case SYMBOL_REF:
147 case PC:
148 return;
149
150 default:
151 break;
152 }
153
154 format_ptr = GET_RTX_FORMAT (GET_CODE (part));
155
156 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
157 switch (*format_ptr++)
158 {
159 case 'e':
160 case 'u':
161 walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);
162 break;
163 case 'E':
164 if (XVEC (part, i) != NULL)
165 for (j = 0; j < XVECLEN (part, i); j++)
166 walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);
167 break;
168 }
169 }
170
171 static void
gen_insn(md_rtx_info * info)172 gen_insn (md_rtx_info *info)
173 {
174 int i;
175
176 /* Walk the insn pattern to gather the #define's status. */
177 rtx insn = info->def;
178 clobbers_seen_this_insn = 0;
179 dup_operands_seen_this_insn = 0;
180 if (XVEC (insn, 1) != 0)
181 for (i = 0; i < XVECLEN (insn, 1); i++)
182 walk_insn_part (XVECEXP (insn, 1, i), 1, 0);
183
184 if (clobbers_seen_this_insn > max_clobbers_per_insn)
185 max_clobbers_per_insn = clobbers_seen_this_insn;
186 if (dup_operands_seen_this_insn > max_dup_operands)
187 max_dup_operands = dup_operands_seen_this_insn;
188 }
189
190 /* Similar but scan a define_expand. */
191
192 static void
gen_expand(md_rtx_info * info)193 gen_expand (md_rtx_info *info)
194 {
195 int i;
196
197 /* Walk the insn pattern to gather the #define's status. */
198
199 /* Note that we don't bother recording the number of MATCH_DUPs
200 that occur in a gen_expand, because only reload cares about that. */
201 rtx insn = info->def;
202 if (XVEC (insn, 1) != 0)
203 for (i = 0; i < XVECLEN (insn, 1); i++)
204 {
205 /* Compute the maximum SETs and CLOBBERS
206 in any one of the sub-insns;
207 don't sum across all of them. */
208 clobbers_seen_this_insn = 0;
209
210 walk_insn_part (XVECEXP (insn, 1, i), 0, 0);
211
212 if (clobbers_seen_this_insn > max_clobbers_per_insn)
213 max_clobbers_per_insn = clobbers_seen_this_insn;
214 }
215 }
216
217 /* Similar but scan a define_split. */
218
219 static void
gen_split(md_rtx_info * info)220 gen_split (md_rtx_info *info)
221 {
222 int i;
223
224 /* Look through the patterns that are matched
225 to compute the maximum operand number. */
226 rtx split = info->def;
227 for (i = 0; i < XVECLEN (split, 0); i++)
228 walk_insn_part (XVECEXP (split, 0, i), 1, 0);
229 /* Look at the number of insns this insn could split into. */
230 if (XVECLEN (split, 2) > max_insns_per_split)
231 max_insns_per_split = XVECLEN (split, 2);
232 }
233
234 static void
gen_peephole(md_rtx_info * info)235 gen_peephole (md_rtx_info *info)
236 {
237 int i;
238
239 /* Look through the patterns that are matched
240 to compute the maximum operand number. */
241 rtx peep = info->def;
242 for (i = 0; i < XVECLEN (peep, 0); i++)
243 walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
244 }
245
246 static void
gen_peephole2(md_rtx_info * info)247 gen_peephole2 (md_rtx_info *info)
248 {
249 int i, n;
250
251 /* Look through the patterns that are matched
252 to compute the maximum operand number. */
253 rtx peep = info->def;
254 for (i = XVECLEN (peep, 0) - 1; i >= 0; --i)
255 walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
256
257 /* Look at the number of insns this insn can be matched from. */
258 for (i = XVECLEN (peep, 0) - 1, n = 0; i >= 0; --i)
259 if (GET_CODE (XVECEXP (peep, 0, i)) != MATCH_DUP
260 && GET_CODE (XVECEXP (peep, 0, i)) != MATCH_SCRATCH)
261 n++;
262 if (n > max_insns_per_peep2)
263 max_insns_per_peep2 = n;
264 }
265
266 int
main(int argc,const char ** argv)267 main (int argc, const char **argv)
268 {
269 progname = "genconfig";
270
271 if (!init_rtx_reader_args (argc, argv))
272 return (FATAL_EXIT_CODE);
273
274 puts ("/* Generated automatically by the program `genconfig'");
275 puts (" from the machine description file `md'. */\n");
276 puts ("#ifndef GCC_INSN_CONFIG_H");
277 puts ("#define GCC_INSN_CONFIG_H\n");
278
279 /* Allow at least 30 operands for the sake of asm constructs. */
280 /* ??? We *really* ought to reorganize things such that there
281 is no fixed upper bound. */
282 max_recog_operands = 29; /* We will add 1 later. */
283 max_dup_operands = 1;
284
285 /* Read the machine description. */
286
287 md_rtx_info info;
288 while (read_md_rtx (&info))
289 switch (GET_CODE (info.def))
290 {
291 case DEFINE_INSN:
292 gen_insn (&info);
293 break;
294
295 case DEFINE_EXPAND:
296 gen_expand (&info);
297 break;
298
299 case DEFINE_SPLIT:
300 gen_split (&info);
301 break;
302
303 case DEFINE_PEEPHOLE2:
304 have_peephole2_flag = 1;
305 gen_peephole2 (&info);
306 break;
307
308 case DEFINE_PEEPHOLE:
309 have_peephole_flag = 1;
310 gen_peephole (&info);
311 break;
312
313 default:
314 break;
315 }
316
317 printf ("#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);
318 printf ("#define MAX_DUP_OPERANDS %d\n", max_dup_operands);
319
320 /* This is conditionally defined, in case the user writes code which emits
321 more splits than we can readily see (and knows s/he does it). */
322 printf ("#ifndef MAX_INSNS_PER_SPLIT\n");
323 printf ("#define MAX_INSNS_PER_SPLIT %d\n", max_insns_per_split);
324 printf ("#endif\n");
325
326 if (have_cmove_flag)
327 printf ("#define HAVE_conditional_move 1\n");
328 else
329 printf ("#define HAVE_conditional_move 0\n");
330
331 if (have_cond_exec_flag)
332 printf ("#define HAVE_conditional_execution 1\n");
333 else
334 printf ("#define HAVE_conditional_execution 0\n");
335
336 if (have_lo_sum_flag)
337 printf ("#define HAVE_lo_sum 1\n");
338 else
339 printf ("#define HAVE_lo_sum 0\n");
340
341 if (have_rotate_flag)
342 printf ("#define HAVE_rotate 1\n");
343
344 if (have_rotatert_flag)
345 printf ("#define HAVE_rotatert 1\n");
346
347 if (have_peephole_flag)
348 printf ("#define HAVE_peephole 1\n");
349 else
350 printf ("#define HAVE_peephole 0\n");
351
352 if (have_peephole2_flag)
353 {
354 printf ("#define HAVE_peephole2 1\n");
355 printf ("#define MAX_INSNS_PER_PEEP2 %d\n", max_insns_per_peep2);
356 }
357 else
358 {
359 printf ("#define HAVE_peephole2 0\n");
360 printf ("#define MAX_INSNS_PER_PEEP2 0\n");
361 }
362
363 puts ("\n#endif /* GCC_INSN_CONFIG_H */");
364
365 if (ferror (stdout) || fflush (stdout) || fclose (stdout))
366 return FATAL_EXIT_CODE;
367
368 return SUCCESS_EXIT_CODE;
369 }
370