1 /* Generate from machine description:
2 - some #define configuration flags.
3 Copyright (C) 1987, 1991, 1997, 1998 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
38 #ifdef NEED_DECLARATION_FREE
41 extern rtx
read_rtx ();
43 /* flags to determine output of machine description dependent #define's. */
44 static int max_recog_operands
; /* Largest operand number seen. */
45 static int max_dup_operands
; /* Largest number of match_dup in any insn. */
46 static int max_clobbers_per_insn
;
47 static int register_constraint_flag
;
48 static int have_cc0_flag
;
49 static int have_cmove_flag
;
50 static int have_lo_sum_flag
;
52 /* Maximum number of insns seen in a split. */
53 static int max_insns_per_split
= 1;
55 static int clobbers_seen_this_insn
;
56 static int dup_operands_seen_this_insn
;
62 /* RECOG_P will be non-zero if this pattern was seen in a context where it will
63 be used to recognize, rather than just generate an insn.
65 NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC
66 of a SET whose destination is not (pc). */
69 walk_insn_part (part
, recog_p
, non_pc_set_src
)
75 register RTX_CODE code
;
76 register char *format_ptr
;
81 code
= GET_CODE (part
);
85 clobbers_seen_this_insn
++;
89 if (XINT (part
, 0) > max_recog_operands
)
90 max_recog_operands
= XINT (part
, 0);
91 if (XSTR (part
, 2) && *XSTR (part
, 2))
92 register_constraint_flag
= 1;
97 ++dup_operands_seen_this_insn
;
101 if (XINT (part
, 0) > max_recog_operands
)
102 max_recog_operands
= XINT (part
, 0);
103 /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
108 if (GET_CODE (XEXP (part
, 0)) == MATCH_OPERAND
)
113 ++dup_operands_seen_this_insn
;
114 if (XINT (part
, 0) > max_recog_operands
)
115 max_recog_operands
= XINT (part
, 0);
125 have_lo_sum_flag
= 1;
129 walk_insn_part (SET_DEST (part
), 0, recog_p
);
130 walk_insn_part (SET_SRC (part
), recog_p
,
131 GET_CODE (SET_DEST (part
)) != PC
);
135 /* Only consider this machine as having a conditional move if the
136 two arms of the IF_THEN_ELSE are both MATCH_OPERAND. Otherwise,
137 we have some specific IF_THEN_ELSE construct (like the doz
138 instruction on the RS/6000) that can't be used in the general
139 context we want it for. */
141 if (recog_p
&& non_pc_set_src
142 && GET_CODE (XEXP (part
, 1)) == MATCH_OPERAND
143 && GET_CODE (XEXP (part
, 2)) == MATCH_OPERAND
)
147 case REG
: case CONST_INT
: case SYMBOL_REF
:
155 format_ptr
= GET_RTX_FORMAT (GET_CODE (part
));
157 for (i
= 0; i
< GET_RTX_LENGTH (GET_CODE (part
)); i
++)
158 switch (*format_ptr
++)
162 walk_insn_part (XEXP (part
, i
), recog_p
, non_pc_set_src
);
165 if (XVEC (part
, i
) != NULL
)
166 for (j
= 0; j
< XVECLEN (part
, i
); j
++)
167 walk_insn_part (XVECEXP (part
, i
, j
), recog_p
, non_pc_set_src
);
178 /* Walk the insn pattern to gather the #define's status. */
179 clobbers_seen_this_insn
= 0;
180 dup_operands_seen_this_insn
= 0;
181 if (XVEC (insn
, 1) != 0)
182 for (i
= 0; i
< XVECLEN (insn
, 1); i
++)
183 walk_insn_part (XVECEXP (insn
, 1, i
), 1, 0);
185 if (clobbers_seen_this_insn
> max_clobbers_per_insn
)
186 max_clobbers_per_insn
= clobbers_seen_this_insn
;
187 if (dup_operands_seen_this_insn
> max_dup_operands
)
188 max_dup_operands
= dup_operands_seen_this_insn
;
191 /* Similar but scan a define_expand. */
199 /* Walk the insn pattern to gather the #define's status. */
201 /* Note that we don't bother recording the number of MATCH_DUPs
202 that occur in a gen_expand, because only reload cares about that. */
203 if (XVEC (insn
, 1) != 0)
204 for (i
= 0; i
< XVECLEN (insn
, 1); i
++)
206 /* Compute the maximum SETs and CLOBBERS
207 in any one of the sub-insns;
208 don't sum across all of them. */
209 clobbers_seen_this_insn
= 0;
211 walk_insn_part (XVECEXP (insn
, 1, i
), 0, 0);
213 if (clobbers_seen_this_insn
> max_clobbers_per_insn
)
214 max_clobbers_per_insn
= clobbers_seen_this_insn
;
218 /* Similar but scan a define_split. */
226 /* Look through the patterns that are matched
227 to compute the maximum operand number. */
228 for (i
= 0; i
< XVECLEN (split
, 0); i
++)
229 walk_insn_part (XVECEXP (split
, 0, i
), 1, 0);
230 /* Look at the number of insns this insn could split into. */
231 if (XVECLEN (split
, 2) > max_insns_per_split
)
232 max_insns_per_split
= XVECLEN (split
, 2);
241 /* Look through the patterns that are matched
242 to compute the maximum operand number. */
243 for (i
= 0; i
< XVECLEN (peep
, 0); i
++)
244 walk_insn_part (XVECEXP (peep
, 0, i
), 1, 0);
251 register char *val
= (char *) malloc (size
);
254 fatal ("virtual memory exhausted");
264 char *result
= (char *) realloc (ptr
, size
);
266 fatal ("virtual memory exhausted");
274 fprintf (stderr
, "genconfig: ");
275 fprintf (stderr
, s
, a1
, a2
);
276 fprintf (stderr
, "\n");
277 exit (FATAL_EXIT_CODE
);
280 /* More 'friendly' abort that prints the line and file.
281 config.h can #define abort fancy_abort if you like that sort of thing. */
286 fatal ("Internal gcc abort.");
298 obstack_init (rtl_obstack
);
301 fatal ("No input file name.");
303 infile
= fopen (argv
[1], "r");
307 exit (FATAL_EXIT_CODE
);
312 printf ("/* Generated automatically by the program `genconfig'\n\
313 from the machine description file `md'. */\n\n");
315 /* Allow at least 10 operands for the sake of asm constructs. */
316 max_recog_operands
= 9; /* We will add 1 later. */
317 max_dup_operands
= 1;
319 /* Read the machine description. */
323 c
= read_skip_spaces (infile
);
328 desc
= read_rtx (infile
);
329 if (GET_CODE (desc
) == DEFINE_INSN
)
331 if (GET_CODE (desc
) == DEFINE_EXPAND
)
333 if (GET_CODE (desc
) == DEFINE_SPLIT
)
335 if (GET_CODE (desc
) == DEFINE_PEEPHOLE
)
339 printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands
+ 1);
341 printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands
);
343 /* This is conditionally defined, in case the user writes code which emits
344 more splits than we can readily see (and knows s/he does it). */
345 printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n",
346 max_insns_per_split
);
348 if (register_constraint_flag
)
349 printf ("#define REGISTER_CONSTRAINTS\n");
352 printf ("#define HAVE_cc0\n");
355 printf ("#define HAVE_conditional_move\n");
357 if (have_lo_sum_flag
)
358 printf ("#define HAVE_lo_sum\n");
361 exit (ferror (stdout
) != 0 ? FATAL_EXIT_CODE
: SUCCESS_EXIT_CODE
);