re PR tree-optimization/38458 (copy-propagation doesn't handle cycles)

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

	PR tree-optimization/38458
	* tree-ssa-copy.c (copy_prop_visit_phi_node): For the first
	argument use the arguments copy-of value.

From-SVN: r145185

gcc/ChangeLog

 2009-03-28  Richard Guenther  <rguenther@suse.de>
 
+	PR tree-optimization/38458
+	* tree-ssa-copy.c (copy_prop_visit_phi_node): For the first
+	argument use the arguments copy-of value.
+
+2009-03-28  Richard Guenther  <rguenther@suse.de>
+
 	PR tree-optimization/38180
 	* tree-ssa-ccp.c (get_default_value): Simplify.
 	(likely_value): Likewise.

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;
+	  phi_val.value = arg_val->value;
 	  continue;
 	}