2010-04-30 Richard Guenther <rguenther@suse.de>

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

diff --git a/gcc/cselib.c b/gcc/cselib.c
index b5750a0..f46c5ec 100644 (file)
--- a/gcc/cselib.c
+++ b/gcc/cselib.c
@@ -567,6 +567,18 @@ cselib_preserved_value_p (cselib_val *v)
   return PRESERVED_VALUE_P (v->val_rtx);
 }
 
+/* Arrange for a REG value to be assumed constant through the whole function,
+   never invalidated and preserved across cselib_reset_table calls.  */
+
+void
+cselib_preserve_cfa_base_value (cselib_val *v)
+{
+  if (cselib_preserve_constants
+      && v->locs
+      && REG_P (v->locs->loc))
+    cfa_base_preserved_val = v;
+}
+
 /* Clean all non-constant expressions in the hash table, but retain
    their values.  */