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

diff --git a/gcc/cselib.h b/gcc/cselib.h
index 3590f98..96575f9 100644 (file)
--- a/gcc/cselib.h
+++ b/gcc/cselib.h
@@ -1,6 +1,6 @@
 /* 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, 2009, 2010
+   1998, 1999, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -88,6 +88,7 @@ extern rtx cselib_expand_value_rtx_cb (rtx, bitmap, int,
 extern bool cselib_dummy_expand_value_rtx_cb (rtx, bitmap, int,
                                              cselib_expand_callback, void *);
 extern rtx cselib_subst_to_values (rtx, enum machine_mode);
+extern rtx cselib_subst_to_values_from_insn (rtx, enum machine_mode, rtx);
 extern void cselib_invalidate_rtx (rtx);
 
 extern void cselib_reset_table (unsigned int);
@@ -96,5 +97,25 @@ extern void cselib_preserve_value (cselib_val *);
 extern bool cselib_preserved_value_p (cselib_val *);
 extern void cselib_preserve_only_values (void);
 extern void cselib_preserve_cfa_base_value (cselib_val *, unsigned int);
+extern void cselib_add_permanent_equiv (cselib_val *, rtx, rtx);
+extern bool cselib_have_permanent_equivalences (void);
 
 extern void dump_cselib_table (FILE *);
+
+/* Return the canonical value for VAL, following the equivalence chain
+   towards the earliest (== lowest uid) equivalent value.  */
+
+static inline cselib_val *
+canonical_cselib_val (cselib_val *val)
+{
+  cselib_val *canon;
+
+  if (!val->locs || val->locs->next
+      || !val->locs->loc || GET_CODE (val->locs->loc) != VALUE
+      || val->uid < CSELIB_VAL_PTR (val->locs->loc)->uid)
+    return val;
+
+  canon = CSELIB_VAL_PTR (val->locs->loc);
+  gcc_checking_assert (canonical_cselib_val (canon) == canon);
+  return canon;
+}