tree-ssa-copy.c (copy_prop_visit_phi_node): Do not leave the PHIs value undefined.

2009-03-28  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-copy.c (copy_prop_visit_phi_node): Do not leave
	the PHIs value undefined.

From-SVN: r145193

gcc/ChangeLog

+2009-03-28  Richard Guenther  <rguenther@suse.de>
+
+	* tree-ssa-copy.c (copy_prop_visit_phi_node): Do not leave
+	the PHIs value undefined.
+
 2009-03-28  Jan Hubicka  <jh@suse.cz>
 
 	* tree-pass.h (pass_fixup_cfg): New pass.

gcc/tree-ssa-copy.c

@@ -892,7 +892,7 @@ copy_prop_visit_phi_node (gimple phi)
 	 memory reference of all the other arguments.  */
       if (phi_val.value == NULL_TREE)
 	{
-	  phi_val.value = arg_val->value;
+	  phi_val.value = arg_val->value ? arg_val->value : arg;
 	  continue;
 	}