2009-11-28 Kai Tietz <kai.tietz@onevision.com>

[pf3gnuchains/gcc-fork.git] / gcc / cselib.h

diff --git a/gcc/cselib.h b/gcc/cselib.h
index a3f7ee9..433f4de 100644 (file)
--- a/gcc/cselib.h
+++ b/gcc/cselib.h
@@ -1,48 +1,44 @@
 /* Common subexpression elimination for GNU compiler.
    Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-   1999 Free Software Foundation, Inc.
+   1999, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
 
-This file is part of GNU CC.
+This file is part of GCC.
 
-GNU CC 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 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 3, or (at your option) any later
+version.
 
-GNU CC 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.
+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 GNU CC; see the file COPYING.  If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
 
 /* Describe a value.  */
-typedef struct cselib_val_struct
-{
+typedef struct GTY(()) 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;
+
+  /* A VALUE rtx that points back to this structure.  */
+  rtx val_rtx;
 
   /* 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;
+
+  struct cselib_val_struct *next_containing_mem;
 } cselib_val;
 
 /* A list of rtl expressions that hold the same value.  */
-struct elt_loc_list
-{
+struct GTY(()) elt_loc_list {
   /* Next element in the list.  */
   struct elt_loc_list *next;
   /* An rtl expression that holds the value.  */
@@ -52,17 +48,43 @@ struct elt_loc_list
 };
 
 /* A list of cselib_val structures.  */
-struct elt_list
-{
+struct GTY(()) 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));
+/* Describe a single set that is part of an insn.  */
+struct cselib_set
+{
+  rtx src;
+  rtx dest;
+  cselib_val *src_elt;
+  cselib_val *dest_addr_elt;
+};
+
+extern void (*cselib_discard_hook) (cselib_val *);
+extern void (*cselib_record_sets_hook) (rtx insn, struct cselib_set *sets,
+                                       int n_sets);
+
+extern cselib_val *cselib_lookup (rtx, enum machine_mode, int);
+extern void cselib_init (bool record_memory);
+extern void cselib_clear_table (void);
+extern void cselib_finish (void);
+extern void cselib_process_insn (rtx);
+extern enum machine_mode cselib_reg_set_mode (const_rtx);
+extern int rtx_equal_for_cselib_p (rtx, rtx);
+extern int references_value_p (const_rtx, int);
+extern rtx cselib_expand_value_rtx (rtx, bitmap, int);
+typedef rtx (*cselib_expand_callback)(rtx, bitmap, int, void *);
+extern rtx cselib_expand_value_rtx_cb (rtx, bitmap, int,
+                                      cselib_expand_callback, void*);
+extern rtx cselib_subst_to_values (rtx);
+extern void cselib_invalidate_rtx (rtx);
+
+extern void cselib_reset_table_with_next_value (unsigned int);
+extern unsigned int cselib_get_next_unknown_value (void);
+extern void cselib_preserve_value (cselib_val *);
+extern bool cselib_preserved_value_p (cselib_val *);
+extern void cselib_preserve_only_values (bool);
+
+extern void dump_cselib_table (FILE *);