91 lines
3.0 KiB
C
91 lines
3.0 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, 2003, 2004, 2005, 2006, 2007, 2008 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 3, 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 COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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/* Describe a value. */
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typedef struct GTY(()) cselib_val_struct {
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/* The hash value. */
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unsigned int value;
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/* A VALUE rtx that points back to this structure. */
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rtx val_rtx;
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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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struct cselib_val_struct *next_containing_mem;
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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 GTY(()) elt_loc_list {
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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 GTY(()) elt_list {
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struct elt_list *next;
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cselib_val *elt;
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};
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/* Describe a single set that is part of an insn. */
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struct cselib_set
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{
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rtx src;
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rtx dest;
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cselib_val *src_elt;
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cselib_val *dest_addr_elt;
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};
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extern void (*cselib_discard_hook) (cselib_val *);
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extern void (*cselib_record_sets_hook) (rtx insn, struct cselib_set *sets,
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int n_sets);
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extern cselib_val *cselib_lookup (rtx, enum machine_mode, int);
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extern void cselib_init (bool record_memory);
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extern void cselib_clear_table (void);
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extern void cselib_finish (void);
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extern void cselib_process_insn (rtx);
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extern enum machine_mode cselib_reg_set_mode (const_rtx);
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extern int rtx_equal_for_cselib_p (rtx, rtx);
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extern int references_value_p (const_rtx, int);
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extern rtx cselib_expand_value_rtx (rtx, bitmap, int);
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typedef rtx (*cselib_expand_callback)(rtx, bitmap, int, void *);
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extern rtx cselib_expand_value_rtx_cb (rtx, bitmap, int,
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cselib_expand_callback, void*);
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extern rtx cselib_subst_to_values (rtx);
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extern void cselib_invalidate_rtx (rtx);
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extern void cselib_reset_table_with_next_value (unsigned int);
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extern unsigned int cselib_get_next_unknown_value (void);
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extern void cselib_preserve_value (cselib_val *);
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extern bool cselib_preserved_value_p (cselib_val *);
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extern void cselib_preserve_only_values (bool);
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extern void dump_cselib_table (FILE *);
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