--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/cselib.h	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,71 @@
+/* Common subexpression elimination for GNU compiler.
+   Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
+   1999, 2003, 2004, 2005, 2006, 2007, 2008 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 3, 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 COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+/* Describe a value.  */
+typedef struct cselib_val_struct GTY(())
+{
+  /* The hash value.  */
+  unsigned int value;
+
+  /* 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 GTY(())
+{
+  /* 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 GTY(())
+{
+  struct elt_list *next;
+  cselib_val *elt;
+};
+
+extern void (*cselib_discard_hook) (cselib_val *);
+
+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);
+extern rtx cselib_subst_to_values (rtx);
+extern void cselib_invalidate_rtx (rtx);