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, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
29 static struct obstack obstack;
30 struct obstack *rtl_obstack = &obstack;
32 #define obstack_chunk_alloc xmalloc
33 #define obstack_chunk_free free
36 extern rtx read_rtx ();
38 /* flags to determine output of machine description dependent #define's. */
39 static int max_recog_operands; /* Largest operand number seen. */
40 static int max_dup_operands; /* Largest number of match_dup in any insn. */
41 static int max_clobbers_per_insn;
42 static int register_constraint_flag;
43 static int have_cc0_flag;
44 static int have_cmove_flag;
45 static int have_lo_sum_flag;
47 /* Maximum number of insns seen in a split. */
48 static int max_insns_per_split = 1;
50 static int clobbers_seen_this_insn;
51 static int dup_operands_seen_this_insn;
57 /* RECOG_P will be non-zero if this pattern was seen in a context where it will
58 be used to recognize, rather than just generate an insn.
60 NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC
61 of a SET whose destination is not (pc). */
64 walk_insn_part (part, recog_p, non_pc_set_src)
70 register RTX_CODE code;
71 register char *format_ptr;
76 code = GET_CODE (part);
80 clobbers_seen_this_insn++;
84 if (XINT (part, 0) > max_recog_operands)
85 max_recog_operands = XINT (part, 0);
86 if (XSTR (part, 2) && *XSTR (part, 2))
87 register_constraint_flag = 1;
92 ++dup_operands_seen_this_insn;
96 if (XINT (part, 0) > max_recog_operands)
97 max_recog_operands = XINT (part, 0);
98 /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
103 if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND)
108 ++dup_operands_seen_this_insn;
109 if (XINT (part, 0) > max_recog_operands)
110 max_recog_operands = XINT (part, 0);
120 have_lo_sum_flag = 1;
124 walk_insn_part (SET_DEST (part), 0, recog_p);
125 walk_insn_part (SET_SRC (part), recog_p,
126 GET_CODE (SET_DEST (part)) != PC);
130 /* Only consider this machine as having a conditional move if the
131 two arms of the IF_THEN_ELSE are both MATCH_OPERAND. Otherwise,
132 we have some specific IF_THEN_ELSE construct (like the doz
133 instruction on the RS/6000) that can't be used in the general
134 context we want it for. */
136 if (recog_p && non_pc_set_src
137 && GET_CODE (XEXP (part, 1)) == MATCH_OPERAND
138 && GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)
142 case REG: case CONST_INT: case SYMBOL_REF:
147 format_ptr = GET_RTX_FORMAT (GET_CODE (part));
149 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
150 switch (*format_ptr++)
154 walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);
157 if (XVEC (part, i) != NULL)
158 for (j = 0; j < XVECLEN (part, i); j++)
159 walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);
170 /* Walk the insn pattern to gather the #define's status. */
171 clobbers_seen_this_insn = 0;
172 dup_operands_seen_this_insn = 0;
173 if (XVEC (insn, 1) != 0)
174 for (i = 0; i < XVECLEN (insn, 1); i++)
175 walk_insn_part (XVECEXP (insn, 1, i), 1, 0);
177 if (clobbers_seen_this_insn > max_clobbers_per_insn)
178 max_clobbers_per_insn = clobbers_seen_this_insn;
179 if (dup_operands_seen_this_insn > max_dup_operands)
180 max_dup_operands = dup_operands_seen_this_insn;
183 /* Similar but scan a define_expand. */
191 /* Walk the insn pattern to gather the #define's status. */
193 /* Note that we don't bother recording the number of MATCH_DUPs
194 that occur in a gen_expand, because only reload cares about that. */
195 if (XVEC (insn, 1) != 0)
196 for (i = 0; i < XVECLEN (insn, 1); i++)
198 /* Compute the maximum SETs and CLOBBERS
199 in any one of the sub-insns;
200 don't sum across all of them. */
201 clobbers_seen_this_insn = 0;
203 walk_insn_part (XVECEXP (insn, 1, i), 0, 0);
205 if (clobbers_seen_this_insn > max_clobbers_per_insn)
206 max_clobbers_per_insn = clobbers_seen_this_insn;
210 /* Similar but scan a define_split. */
218 /* Look through the patterns that are matched
219 to compute the maximum operand number. */
220 for (i = 0; i < XVECLEN (split, 0); i++)
221 walk_insn_part (XVECEXP (split, 0, i), 1, 0);
222 /* Look at the number of insns this insn could split into. */
223 if (XVECLEN (split, 2) > max_insns_per_split)
224 max_insns_per_split = XVECLEN (split, 2);
233 /* Look through the patterns that are matched
234 to compute the maximum operand number. */
235 for (i = 0; i < XVECLEN (peep, 0); i++)
236 walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
243 register char *val = (char *) malloc (size);
246 fatal ("virtual memory exhausted");
256 char *result = (char *) realloc (ptr, size);
258 fatal ("virtual memory exhausted");
266 fprintf (stderr, "genconfig: ");
267 fprintf (stderr, s, a1, a2);
268 fprintf (stderr, "\n");
269 exit (FATAL_EXIT_CODE);
272 /* More 'friendly' abort that prints the line and file.
273 config.h can #define abort fancy_abort if you like that sort of thing. */
278 fatal ("Internal gcc abort.");
290 obstack_init (rtl_obstack);
293 fatal ("No input file name.");
295 infile = fopen (argv[1], "r");
299 exit (FATAL_EXIT_CODE);
304 printf ("/* Generated automatically by the program `genconfig'\n\
305 from the machine description file `md'. */\n\n");
307 /* Allow at least 10 operands for the sake of asm constructs. */
308 max_recog_operands = 9; /* We will add 1 later. */
309 max_dup_operands = 1;
311 /* Read the machine description. */
315 c = read_skip_spaces (infile);
320 desc = read_rtx (infile);
321 if (GET_CODE (desc) == DEFINE_INSN)
323 if (GET_CODE (desc) == DEFINE_EXPAND)
325 if (GET_CODE (desc) == DEFINE_SPLIT)
327 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
331 printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);
333 printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands);
335 /* This is conditionally defined, in case the user writes code which emits
336 more splits than we can readily see (and knows s/he does it). */
337 printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n",
338 max_insns_per_split);
340 if (register_constraint_flag)
341 printf ("#define REGISTER_CONSTRAINTS\n");
344 printf ("#define HAVE_cc0\n");
347 printf ("#define HAVE_conditional_move\n");
349 if (have_lo_sum_flag)
350 printf ("#define HAVE_lo_sum\n");
353 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);