1 /* Generate from machine description:
3 - some #define configuration flags.
4 Copyright (C) 1987, 1991 Free Software Foundation, Inc.
6 This file is part of GNU CC.
8 GNU CC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GNU CC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GNU CC; see the file COPYING. If not, write to
20 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
28 static struct obstack obstack;
29 struct obstack *rtl_obstack = &obstack;
31 #define obstack_chunk_alloc xmalloc
32 #define obstack_chunk_free free
35 extern rtx read_rtx ();
37 /* flags to determine output of machine description dependent #define's. */
38 static int max_recog_operands; /* Largest operand number seen. */
39 static int max_dup_operands; /* Largest number of match_dup in any insn. */
40 static int max_clobbers_per_insn;
41 static int register_constraint_flag;
42 static int have_cc0_flag;
43 static int have_cmove_flag;
44 static int have_lo_sum_flag;
46 /* Maximum number of insns seen in a split. */
47 static int max_insns_per_split = 1;
49 static int clobbers_seen_this_insn;
50 static int dup_operands_seen_this_insn;
56 /* RECOG_P will be non-zero if this pattern was seen in a context where it will
57 be used to recognize, rather than just generate an insn.
59 NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC
60 of a SET whose destination is not (pc). */
63 walk_insn_part (part, recog_p, non_pc_set_src)
69 register RTX_CODE code;
70 register char *format_ptr;
75 code = GET_CODE (part);
79 clobbers_seen_this_insn++;
83 if (XINT (part, 0) > max_recog_operands)
84 max_recog_operands = XINT (part, 0);
85 if (XSTR (part, 2) && *XSTR (part, 2))
86 register_constraint_flag = 1;
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)
141 case REG: case CONST_INT: case SYMBOL_REF:
146 format_ptr = GET_RTX_FORMAT (GET_CODE (part));
148 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
149 switch (*format_ptr++)
153 walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);
156 if (XVEC (part, i) != NULL)
157 for (j = 0; j < XVECLEN (part, i); j++)
158 walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);
169 /* Walk the insn pattern to gather the #define's status. */
170 clobbers_seen_this_insn = 0;
171 dup_operands_seen_this_insn = 0;
172 if (XVEC (insn, 1) != 0)
173 for (i = 0; i < XVECLEN (insn, 1); i++)
174 walk_insn_part (XVECEXP (insn, 1, i), 1, 0);
176 if (clobbers_seen_this_insn > max_clobbers_per_insn)
177 max_clobbers_per_insn = clobbers_seen_this_insn;
178 if (dup_operands_seen_this_insn > max_dup_operands)
179 max_dup_operands = dup_operands_seen_this_insn;
182 /* Similar but scan a define_expand. */
190 /* Walk the insn pattern to gather the #define's status. */
192 /* Note that we don't bother recording the number of MATCH_DUPs
193 that occur in a gen_expand, because only reload cares about that. */
194 if (XVEC (insn, 1) != 0)
195 for (i = 0; i < XVECLEN (insn, 1); i++)
197 /* Compute the maximum SETs and CLOBBERS
198 in any one of the sub-insns;
199 don't sum across all of them. */
200 clobbers_seen_this_insn = 0;
202 walk_insn_part (XVECEXP (insn, 1, i), 0, 0);
204 if (clobbers_seen_this_insn > max_clobbers_per_insn)
205 max_clobbers_per_insn = clobbers_seen_this_insn;
209 /* Similar but scan a define_split. */
217 /* Look through the patterns that are matched
218 to compute the maximum operand number. */
219 for (i = 0; i < XVECLEN (split, 0); i++)
220 walk_insn_part (XVECEXP (split, 0, i), 1, 0);
221 /* Look at the number of insns this insn could split into. */
222 if (XVECLEN (split, 2) > max_insns_per_split)
223 max_insns_per_split = XVECLEN (split, 2);
232 /* Look through the patterns that are matched
233 to compute the maximum operand number. */
234 for (i = 0; i < XVECLEN (peep, 0); i++)
235 walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
242 register char *val = (char *) malloc (size);
245 fatal ("virtual memory exhausted");
255 char *result = (char *) realloc (ptr, size);
257 fatal ("virtual memory exhausted");
265 fprintf (stderr, "genconfig: ");
266 fprintf (stderr, s, a1, a2);
267 fprintf (stderr, "\n");
268 exit (FATAL_EXIT_CODE);
271 /* More 'friendly' abort that prints the line and file.
272 config.h can #define abort fancy_abort if you like that sort of thing. */
277 fatal ("Internal gcc abort.");
289 obstack_init (rtl_obstack);
292 fatal ("No input file name.");
294 infile = fopen (argv[1], "r");
298 exit (FATAL_EXIT_CODE);
303 printf ("/* Generated automatically by the program `genconfig'\n\
304 from the machine description file `md'. */\n\n");
306 /* Allow at least 10 operands for the sake of asm constructs. */
307 max_recog_operands = 9; /* We will add 1 later. */
308 max_dup_operands = 1;
310 /* Read the machine description. */
314 c = read_skip_spaces (infile);
319 desc = read_rtx (infile);
320 if (GET_CODE (desc) == DEFINE_INSN)
322 if (GET_CODE (desc) == DEFINE_EXPAND)
324 if (GET_CODE (desc) == DEFINE_SPLIT)
326 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
330 printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);
332 printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands);
334 /* This is conditionally defined, in case the user writes code which emits
335 more splits than we can readily see (and knows s/he does it). */
336 printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n",
337 max_insns_per_split);
339 if (register_constraint_flag)
340 printf ("#define REGISTER_CONSTRAINTS\n");
343 printf ("#define HAVE_cc0\n");
346 printf ("#define HAVE_conditional_move\n");
348 if (have_lo_sum_flag)
349 printf ("#define HAVE_lo_sum\n");
352 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);