/* Common subexpression elimination for GNU compiler.
|
/* Common subexpression elimination for GNU compiler.
|
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
|
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
|
1998, 1999, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
|
1998, 1999, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
|
Free Software Foundation, Inc.
|
Free Software Foundation, Inc.
|
|
|
This file is part of GCC.
|
This file is part of GCC.
|
|
|
GCC is free software; you can redistribute it and/or modify it under
|
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
|
the terms of the GNU General Public License as published by the Free
|
Software Foundation; either version 3, or (at your option) any later
|
Software Foundation; either version 3, or (at your option) any later
|
version.
|
version.
|
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
for more details.
|
for more details.
|
|
|
You should have received a copy of the GNU General Public License
|
You should have received a copy of the GNU General Public License
|
along with GCC; see the file COPYING3. If not see
|
along with GCC; see the file COPYING3. If not see
|
<http://www.gnu.org/licenses/>. */
|
<http://www.gnu.org/licenses/>. */
|
|
|
/* Describe a value. */
|
/* Describe a value. */
|
typedef struct GTY(()) cselib_val_struct {
|
typedef struct GTY(()) cselib_val_struct {
|
/* The hash value. */
|
/* The hash value. */
|
unsigned int hash;
|
unsigned int hash;
|
|
|
/* A unique id assigned to values. */
|
/* A unique id assigned to values. */
|
int uid;
|
int uid;
|
|
|
/* A VALUE rtx that points back to this structure. */
|
/* A VALUE rtx that points back to this structure. */
|
rtx val_rtx;
|
rtx val_rtx;
|
|
|
/* All rtl expressions that hold this value at the current time during a
|
/* All rtl expressions that hold this value at the current time during a
|
scan. */
|
scan. */
|
struct elt_loc_list *locs;
|
struct elt_loc_list *locs;
|
|
|
/* If this value is used as an address, points to a list of values that
|
/* If this value is used as an address, points to a list of values that
|
use it as an address in a MEM. */
|
use it as an address in a MEM. */
|
struct elt_list *addr_list;
|
struct elt_list *addr_list;
|
|
|
struct cselib_val_struct *next_containing_mem;
|
struct cselib_val_struct *next_containing_mem;
|
} cselib_val;
|
} cselib_val;
|
|
|
/* A list of rtl expressions that hold the same value. */
|
/* A list of rtl expressions that hold the same value. */
|
struct GTY(()) elt_loc_list {
|
struct GTY(()) elt_loc_list {
|
/* Next element in the list. */
|
/* Next element in the list. */
|
struct elt_loc_list *next;
|
struct elt_loc_list *next;
|
/* An rtl expression that holds the value. */
|
/* An rtl expression that holds the value. */
|
rtx loc;
|
rtx loc;
|
/* The insn that made the equivalence. */
|
/* The insn that made the equivalence. */
|
rtx setting_insn;
|
rtx setting_insn;
|
};
|
};
|
|
|
/* A list of cselib_val structures. */
|
/* A list of cselib_val structures. */
|
struct GTY(()) elt_list {
|
struct GTY(()) elt_list {
|
struct elt_list *next;
|
struct elt_list *next;
|
cselib_val *elt;
|
cselib_val *elt;
|
};
|
};
|
|
|
/* Describe a single set that is part of an insn. */
|
/* Describe a single set that is part of an insn. */
|
struct cselib_set
|
struct cselib_set
|
{
|
{
|
rtx src;
|
rtx src;
|
rtx dest;
|
rtx dest;
|
cselib_val *src_elt;
|
cselib_val *src_elt;
|
cselib_val *dest_addr_elt;
|
cselib_val *dest_addr_elt;
|
};
|
};
|
|
|
enum cselib_record_what
|
enum cselib_record_what
|
{
|
{
|
CSELIB_RECORD_MEMORY = 1,
|
CSELIB_RECORD_MEMORY = 1,
|
CSELIB_PRESERVE_CONSTANTS = 2
|
CSELIB_PRESERVE_CONSTANTS = 2
|
};
|
};
|
|
|
extern void (*cselib_discard_hook) (cselib_val *);
|
extern void (*cselib_discard_hook) (cselib_val *);
|
extern void (*cselib_record_sets_hook) (rtx insn, struct cselib_set *sets,
|
extern void (*cselib_record_sets_hook) (rtx insn, struct cselib_set *sets,
|
int n_sets);
|
int n_sets);
|
|
|
extern cselib_val *cselib_lookup (rtx, enum machine_mode, int);
|
extern cselib_val *cselib_lookup (rtx, enum machine_mode, int);
|
extern cselib_val *cselib_lookup_from_insn (rtx, enum machine_mode, int, rtx);
|
extern cselib_val *cselib_lookup_from_insn (rtx, enum machine_mode, int, rtx);
|
extern void cselib_init (int);
|
extern void cselib_init (int);
|
extern void cselib_clear_table (void);
|
extern void cselib_clear_table (void);
|
extern void cselib_finish (void);
|
extern void cselib_finish (void);
|
extern void cselib_process_insn (rtx);
|
extern void cselib_process_insn (rtx);
|
extern enum machine_mode cselib_reg_set_mode (const_rtx);
|
extern enum machine_mode cselib_reg_set_mode (const_rtx);
|
extern int rtx_equal_for_cselib_p (rtx, rtx);
|
extern int rtx_equal_for_cselib_p (rtx, rtx);
|
extern int references_value_p (const_rtx, int);
|
extern int references_value_p (const_rtx, int);
|
extern rtx cselib_expand_value_rtx (rtx, bitmap, int);
|
extern rtx cselib_expand_value_rtx (rtx, bitmap, int);
|
typedef rtx (*cselib_expand_callback)(rtx, bitmap, int, void *);
|
typedef rtx (*cselib_expand_callback)(rtx, bitmap, int, void *);
|
extern rtx cselib_expand_value_rtx_cb (rtx, bitmap, int,
|
extern rtx cselib_expand_value_rtx_cb (rtx, bitmap, int,
|
cselib_expand_callback, void *);
|
cselib_expand_callback, void *);
|
extern bool cselib_dummy_expand_value_rtx_cb (rtx, bitmap, int,
|
extern bool cselib_dummy_expand_value_rtx_cb (rtx, bitmap, int,
|
cselib_expand_callback, void *);
|
cselib_expand_callback, void *);
|
extern rtx cselib_subst_to_values (rtx);
|
extern rtx cselib_subst_to_values (rtx);
|
extern void cselib_invalidate_rtx (rtx);
|
extern void cselib_invalidate_rtx (rtx);
|
|
|
extern void cselib_reset_table (unsigned int);
|
extern void cselib_reset_table (unsigned int);
|
extern unsigned int cselib_get_next_uid (void);
|
extern unsigned int cselib_get_next_uid (void);
|
extern void cselib_preserve_value (cselib_val *);
|
extern void cselib_preserve_value (cselib_val *);
|
extern bool cselib_preserved_value_p (cselib_val *);
|
extern bool cselib_preserved_value_p (cselib_val *);
|
extern void cselib_preserve_only_values (void);
|
extern void cselib_preserve_only_values (void);
|
extern void cselib_preserve_cfa_base_value (cselib_val *, unsigned int);
|
extern void cselib_preserve_cfa_base_value (cselib_val *, unsigned int);
|
|
|
extern void dump_cselib_table (FILE *);
|
extern void dump_cselib_table (FILE *);
|
|
|
