tree-ssa-sccvn.c (try_to_simplify): Allow gimple_fold_stmt_to_constant_1 to follow SSA edges.

2014-11-27  Richard Biener  <rguenther@suse.de>

	* tree-ssa-sccvn.c (try_to_simplify): Allow
	gimple_fold_stmt_to_constant_1 to follow SSA edges.

From-SVN: r218116

gcc/ChangeLog

 2014-11-27  Richard Biener  <rguenther@suse.de>
 
+	* tree-ssa-sccvn.c (try_to_simplify): Allow
+	gimple_fold_stmt_to_constant_1 to follow SSA edges.
+
+2014-11-27  Richard Biener  <rguenther@suse.de>
+
 	PR tree-optimization/64083
 	* tree-ssa-threadupdate.c (thread_through_all_blocks): Do not
 	forcibly mark loop for removal the wrong way.

gcc/tree-ssa-sccvn.c

@@ -3461,7 +3461,7 @@ try_to_simplify (gassign *stmt)
     return NULL_TREE;
 
   /* First try constant folding based on our current lattice.  */
-  tem = gimple_fold_stmt_to_constant_1 (stmt, vn_valueize);
+  tem = gimple_fold_stmt_to_constant_1 (stmt, vn_valueize, vn_valueize);
   if (tem
       && (TREE_CODE (tem) == SSA_NAME
 	  || is_gimple_min_invariant (tem)))