Continue searching in find_oldest_value_reg on class match failure.

From-SVN: r168001

gcc/ChangeLog

+2010-12-17  Richard Henderson  <rth@redhat.com>
+
+	* regcprop.c (find_oldest_value_reg): Continue search instead of
+	failing if an element in the copy chain is of the wrong regclass.
+
 2010-12-17  Paolo Bonzini  <bonzini@gnu.org>
 
 	PR c/20385

gcc/regcprop.c

@@ -457,7 +457,7 @@ find_oldest_value_reg (enum reg_class cl, rtx reg, struct value_data *vd)
       rtx new_rtx;
 
       if (!in_hard_reg_set_p (reg_class_contents[cl], mode, i))
-	return NULL_RTX;
+	continue;
 
       new_rtx = maybe_mode_change (oldmode, vd->e[regno].mode, mode, i, regno);
       if (new_rtx)