1 /* Generate from machine description:
2 - some #define configuration flags.
3 Copyright (C) 1987, 1991, 1997, 1998,
4 1999, 2000 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
28 #include "gensupport.h"
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_cc0_flag;
36 static int have_cmove_flag;
37 static int have_cond_exec_flag;
38 static int have_lo_sum_flag;
39 static int have_peephole_flag;
40 static int have_peephole2_flag;
42 /* Maximum number of insns seen in a split. */
43 static int max_insns_per_split = 1;
45 /* Maximum number of input insns for peephole2. */
46 static int max_insns_per_peep2;
48 static int clobbers_seen_this_insn;
49 static int dup_operands_seen_this_insn;
51 static void walk_insn_part PARAMS ((rtx, int, int));
52 static void gen_insn PARAMS ((rtx));
53 static void gen_expand PARAMS ((rtx));
54 static void gen_split PARAMS ((rtx));
55 static void gen_peephole PARAMS ((rtx));
56 static void gen_peephole2 PARAMS ((rtx));
58 /* RECOG_P will be non-zero if this pattern was seen in a context where it will
59 be used to recognize, rather than just generate an insn.
61 NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC
62 of a SET whose destination is not (pc). */
65 walk_insn_part (part, recog_p, non_pc_set_src)
72 const char *format_ptr;
77 code = GET_CODE (part);
81 clobbers_seen_this_insn++;
85 if (XINT (part, 0) > max_recog_operands)
86 max_recog_operands = XINT (part, 0);
91 ++dup_operands_seen_this_insn;
95 if (XINT (part, 0) > max_recog_operands)
96 max_recog_operands = XINT (part, 0);
97 /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
102 if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND)
107 ++dup_operands_seen_this_insn;
108 if (XINT (part, 0) > max_recog_operands)
109 max_recog_operands = XINT (part, 0);
119 have_lo_sum_flag = 1;
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);
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. */
135 if (recog_p && non_pc_set_src
136 && GET_CODE (XEXP (part, 1)) == MATCH_OPERAND
137 && GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)
143 have_cond_exec_flag = 1;
146 case REG: case CONST_INT: case SYMBOL_REF:
154 format_ptr = GET_RTX_FORMAT (GET_CODE (part));
156 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
157 switch (*format_ptr++)
161 walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);
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);
177 /* Walk the insn pattern to gather the #define's status. */
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);
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;
190 /* Similar but scan a define_expand. */
198 /* Walk the insn pattern to gather the #define's status. */
200 /* Note that we don't bother recording the number of MATCH_DUPs
201 that occur in a gen_expand, because only reload cares about that. */
202 if (XVEC (insn, 1) != 0)
203 for (i = 0; i < XVECLEN (insn, 1); i++)
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;
210 walk_insn_part (XVECEXP (insn, 1, i), 0, 0);
212 if (clobbers_seen_this_insn > max_clobbers_per_insn)
213 max_clobbers_per_insn = clobbers_seen_this_insn;
217 /* Similar but scan a define_split. */
225 /* Look through the patterns that are matched
226 to compute the maximum operand number. */
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);
240 /* Look through the patterns that are matched
241 to compute the maximum operand number. */
242 for (i = 0; i < XVECLEN (peep, 0); i++)
243 walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
252 /* Look through the patterns that are matched
253 to compute the maximum operand number. */
254 for (i = XVECLEN (peep, 0) - 1; i >= 0; --i)
255 walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
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)
262 if (n > max_insns_per_peep2)
263 max_insns_per_peep2 = n;
266 extern int main PARAMS ((int, char **));
275 progname = "genconfig";
278 fatal ("no input file name");
280 if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
281 return (FATAL_EXIT_CODE);
283 puts ("/* Generated automatically by the program `genconfig'");
284 puts (" from the machine description file `md'. */\n");
285 puts ("#ifndef GCC_INSN_CONFIG_H");
286 puts ("#define GCC_INSN_CONFIG_H\n");
288 /* Allow at least 30 operands for the sake of asm constructs. */
289 /* ??? We *really* ought to reorganize things such that there
290 is no fixed upper bound. */
291 max_recog_operands = 29; /* We will add 1 later. */
292 max_dup_operands = 1;
294 /* Read the machine description. */
298 int line_no, insn_code_number = 0;
300 desc = read_md_rtx (&line_no, &insn_code_number);
304 switch (GET_CODE (desc))
318 case DEFINE_PEEPHOLE2:
319 have_peephole2_flag = 1;
320 gen_peephole2 (desc);
323 case DEFINE_PEEPHOLE:
324 have_peephole_flag = 1;
333 printf ("#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);
334 printf ("#define MAX_DUP_OPERANDS %d\n", max_dup_operands);
336 /* This is conditionally defined, in case the user writes code which emits
337 more splits than we can readily see (and knows s/he does it). */
338 printf ("#ifndef MAX_INSNS_PER_SPLIT\n");
339 printf ("#define MAX_INSNS_PER_SPLIT %d\n", max_insns_per_split);
343 printf ("#define HAVE_cc0 1\n");
346 printf ("#define HAVE_conditional_move 1\n");
348 if (have_cond_exec_flag)
349 printf ("#define HAVE_conditional_execution 1\n");
351 if (have_lo_sum_flag)
352 printf ("#define HAVE_lo_sum 1\n");
354 if (have_peephole_flag)
355 printf ("#define HAVE_peephole 1\n");
357 if (have_peephole2_flag)
359 printf ("#define HAVE_peephole2 1\n");
360 printf ("#define MAX_INSNS_PER_PEEP2 %d\n", max_insns_per_peep2);
363 puts("\n#endif /* GCC_INSN_CONFIG_H */");
365 if (ferror (stdout) || fflush (stdout) || fclose (stdout))
366 return FATAL_EXIT_CODE;
368 return SUCCESS_EXIT_CODE;
371 /* Define this so we can link with print-rtl.o to get debug_rtx function. */
374 int code ATTRIBUTE_UNUSED;