1 /* Generate from machine description:
2 - some #define configuration flags.
3 Copyright (C) 1987, 1991, 1997 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
32 static struct obstack obstack;
33 struct obstack *rtl_obstack = &obstack;
35 #define obstack_chunk_alloc xmalloc
36 #define obstack_chunk_free free
39 extern rtx read_rtx ();
41 /* flags to determine output of machine description dependent #define's. */
42 static int max_recog_operands; /* Largest operand number seen. */
43 static int max_dup_operands; /* Largest number of match_dup in any insn. */
44 static int max_clobbers_per_insn;
45 static int register_constraint_flag;
46 static int have_cc0_flag;
47 static int have_cmove_flag;
48 static int have_lo_sum_flag;
50 /* Maximum number of insns seen in a split. */
51 static int max_insns_per_split = 1;
53 static int clobbers_seen_this_insn;
54 static int dup_operands_seen_this_insn;
60 /* RECOG_P will be non-zero if this pattern was seen in a context where it will
61 be used to recognize, rather than just generate an insn.
63 NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC
64 of a SET whose destination is not (pc). */
67 walk_insn_part (part, recog_p, non_pc_set_src)
73 register RTX_CODE code;
74 register char *format_ptr;
79 code = GET_CODE (part);
83 clobbers_seen_this_insn++;
87 if (XINT (part, 0) > max_recog_operands)
88 max_recog_operands = XINT (part, 0);
89 if (XSTR (part, 2) && *XSTR (part, 2))
90 register_constraint_flag = 1;
95 ++dup_operands_seen_this_insn;
99 if (XINT (part, 0) > max_recog_operands)
100 max_recog_operands = XINT (part, 0);
101 /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
106 if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND)
111 ++dup_operands_seen_this_insn;
112 if (XINT (part, 0) > max_recog_operands)
113 max_recog_operands = XINT (part, 0);
123 have_lo_sum_flag = 1;
127 walk_insn_part (SET_DEST (part), 0, recog_p);
128 walk_insn_part (SET_SRC (part), recog_p,
129 GET_CODE (SET_DEST (part)) != PC);
133 /* Only consider this machine as having a conditional move if the
134 two arms of the IF_THEN_ELSE are both MATCH_OPERAND. Otherwise,
135 we have some specific IF_THEN_ELSE construct (like the doz
136 instruction on the RS/6000) that can't be used in the general
137 context we want it for. */
139 if (recog_p && non_pc_set_src
140 && GET_CODE (XEXP (part, 1)) == MATCH_OPERAND
141 && GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)
145 case REG: case CONST_INT: case SYMBOL_REF:
153 format_ptr = GET_RTX_FORMAT (GET_CODE (part));
155 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
156 switch (*format_ptr++)
160 walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);
163 if (XVEC (part, i) != NULL)
164 for (j = 0; j < XVECLEN (part, i); j++)
165 walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);
176 /* Walk the insn pattern to gather the #define's status. */
177 clobbers_seen_this_insn = 0;
178 dup_operands_seen_this_insn = 0;
179 if (XVEC (insn, 1) != 0)
180 for (i = 0; i < XVECLEN (insn, 1); i++)
181 walk_insn_part (XVECEXP (insn, 1, i), 1, 0);
183 if (clobbers_seen_this_insn > max_clobbers_per_insn)
184 max_clobbers_per_insn = clobbers_seen_this_insn;
185 if (dup_operands_seen_this_insn > max_dup_operands)
186 max_dup_operands = dup_operands_seen_this_insn;
189 /* Similar but scan a define_expand. */
197 /* Walk the insn pattern to gather the #define's status. */
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 if (XVEC (insn, 1) != 0)
202 for (i = 0; i < XVECLEN (insn, 1); i++)
204 /* Compute the maximum SETs and CLOBBERS
205 in any one of the sub-insns;
206 don't sum across all of them. */
207 clobbers_seen_this_insn = 0;
209 walk_insn_part (XVECEXP (insn, 1, i), 0, 0);
211 if (clobbers_seen_this_insn > max_clobbers_per_insn)
212 max_clobbers_per_insn = clobbers_seen_this_insn;
216 /* Similar but scan a define_split. */
224 /* Look through the patterns that are matched
225 to compute the maximum operand number. */
226 for (i = 0; i < XVECLEN (split, 0); i++)
227 walk_insn_part (XVECEXP (split, 0, i), 1, 0);
228 /* Look at the number of insns this insn could split into. */
229 if (XVECLEN (split, 2) > max_insns_per_split)
230 max_insns_per_split = XVECLEN (split, 2);
239 /* Look through the patterns that are matched
240 to compute the maximum operand number. */
241 for (i = 0; i < XVECLEN (peep, 0); i++)
242 walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
249 register char *val = (char *) malloc (size);
252 fatal ("virtual memory exhausted");
262 char *result = (char *) realloc (ptr, size);
264 fatal ("virtual memory exhausted");
272 fprintf (stderr, "genconfig: ");
273 fprintf (stderr, s, a1, a2);
274 fprintf (stderr, "\n");
275 exit (FATAL_EXIT_CODE);
278 /* More 'friendly' abort that prints the line and file.
279 config.h can #define abort fancy_abort if you like that sort of thing. */
284 fatal ("Internal gcc abort.");
296 obstack_init (rtl_obstack);
299 fatal ("No input file name.");
301 infile = fopen (argv[1], "r");
305 exit (FATAL_EXIT_CODE);
310 printf ("/* Generated automatically by the program `genconfig'\n\
311 from the machine description file `md'. */\n\n");
313 /* Allow at least 10 operands for the sake of asm constructs. */
314 max_recog_operands = 9; /* We will add 1 later. */
315 max_dup_operands = 1;
317 /* Read the machine description. */
321 c = read_skip_spaces (infile);
326 desc = read_rtx (infile);
327 if (GET_CODE (desc) == DEFINE_INSN)
329 if (GET_CODE (desc) == DEFINE_EXPAND)
331 if (GET_CODE (desc) == DEFINE_SPLIT)
333 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
337 printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);
339 printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands);
341 /* This is conditionally defined, in case the user writes code which emits
342 more splits than we can readily see (and knows s/he does it). */
343 printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n",
344 max_insns_per_split);
346 if (register_constraint_flag)
347 printf ("#define REGISTER_CONSTRAINTS\n");
350 printf ("#define HAVE_cc0\n");
353 printf ("#define HAVE_conditional_move\n");
355 if (have_lo_sum_flag)
356 printf ("#define HAVE_lo_sum\n");
359 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);