mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/* Common subexpression elimination for GNU compiler.
|
|
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
|
|
1999 Free Software Foundation, Inc.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 2, or (at your option) any later
|
|
version.
|
|
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GCC; see the file COPYING. If not, write to the Free
|
|
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
|
|
02111-1307, USA. */
|
|
|
|
/* Describe a value. */
|
|
typedef struct cselib_val_struct
|
|
{
|
|
/* The hash value. */
|
|
unsigned int value;
|
|
union
|
|
{
|
|
/* A VALUE rtx that points back to this structure. */
|
|
rtx val_rtx;
|
|
/* Used to keep a list of free cselib_val structures. */
|
|
struct cselib_val_struct *next_free;
|
|
} u;
|
|
|
|
/* All rtl expressions that hold this value at the current time during a
|
|
scan. */
|
|
struct elt_loc_list *locs;
|
|
/* If this value is used as an address, points to a list of values that
|
|
use it as an address in a MEM. */
|
|
struct elt_list *addr_list;
|
|
} cselib_val;
|
|
|
|
/* A list of rtl expressions that hold the same value. */
|
|
struct elt_loc_list
|
|
{
|
|
/* Next element in the list. */
|
|
struct elt_loc_list *next;
|
|
/* An rtl expression that holds the value. */
|
|
rtx loc;
|
|
/* The insn that made the equivalence. */
|
|
rtx setting_insn;
|
|
};
|
|
|
|
/* A list of cselib_val structures. */
|
|
struct elt_list
|
|
{
|
|
struct elt_list *next;
|
|
cselib_val *elt;
|
|
};
|
|
|
|
extern cselib_val *cselib_lookup PARAMS ((rtx, enum machine_mode, int));
|
|
extern void cselib_update_varray_sizes PARAMS ((void));
|
|
extern void cselib_init PARAMS ((void));
|
|
extern void cselib_finish PARAMS ((void));
|
|
extern void cselib_process_insn PARAMS ((rtx));
|
|
extern int rtx_equal_for_cselib_p PARAMS ((rtx, rtx));
|
|
extern int references_value_p PARAMS ((rtx, int));
|
|
extern rtx cselib_subst_to_values PARAMS ((rtx));
|