67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/* Common subexpression elimination for GNU compiler.
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Copyright (C) 1987, 88, 89, 92-7, 1998, 1999 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Describe a value. */
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typedef struct cselib_val_struct
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{
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/* The hash value. */
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unsigned int value;
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union
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{
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/* A VALUE rtx that points back to this structure. */
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rtx val_rtx;
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/* Used to keep a list of free cselib_val structures. */
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struct cselib_val_struct *next_free;
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} u;
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/* All rtl expressions that hold this value at the current time during a
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scan. */
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struct elt_loc_list *locs;
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/* If this value is used as an address, points to a list of values that
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use it as an address in a MEM. */
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struct elt_list *addr_list;
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} cselib_val;
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/* A list of rtl expressions that hold the same value. */
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struct elt_loc_list
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{
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/* Next element in the list. */
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struct elt_loc_list *next;
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/* An rtl expression that holds the value. */
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rtx loc;
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/* The insn that made the equivalence. */
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rtx setting_insn;
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};
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/* A list of cselib_val structures. */
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struct elt_list
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{
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struct elt_list *next;
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cselib_val *elt;
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};
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extern cselib_val *cselib_lookup PARAMS ((rtx, enum machine_mode, int));
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extern void cselib_update_varray_sizes PARAMS ((void));
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extern void cselib_init PARAMS ((void));
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extern void cselib_finish PARAMS ((void));
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extern void cselib_process_insn PARAMS ((rtx));
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extern int rtx_equal_for_cselib_p PARAMS ((rtx, rtx));
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extern int references_value_p PARAMS ((rtx, int));
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