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69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/* Common subexpression elimination for GNU compiler.
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Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
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1999 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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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 GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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/* Describe a value. */
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typedef struct cselib_val_struct GTY(())
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{
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/* The hash value. */
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unsigned int value;
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union cselib_val_u
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{
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/* A VALUE rtx that points back to this structure. */
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rtx GTY ((tag ("1"))) val_rtx;
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/* Used to keep a list of free cselib_val structures. */
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struct cselib_val_struct * GTY ((skip (""))) next_free;
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} GTY ((desc ("1"))) 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 GTY(())
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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 GTY(())
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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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extern rtx cselib_subst_to_values PARAMS ((rtx));
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