fix pr48988

From-SVN: r174077

gcc/ChangeLog

+2011-05-23  David Li  <davidxl@google.com>
+
+	PR tree-optimization/48988
+	* tree-ssa-uninit.c (convert_control_dep_chain_into_preds):
+	Initialize has_valid_pred for each pred chain.
+
 2011-05-23  Richard Guenther  <rguenther@suse.de>
 
 	* gimple.c (gimple_types_compatible_p_1): Always compare type names.

gcc/tree-ssa-uninit.c

@@ -358,6 +358,8 @@ convert_control_dep_chain_into_preds (VEC(edge, heap) **dep_chains,
   for (i = 0; i < num_chains; i++)
     {
       VEC(edge, heap) *one_cd_chain = dep_chains[i];
+
+      has_valid_pred = false;
       for (j = 0; j < VEC_length (edge, one_cd_chain); j++)
         {
           gimple cond_stmt;