fold-const.c (const_binop): Use ulow () instead of elt (0).

2017-03-02  Richard Biener  <rguenther@suse.de>

	* fold-const.c (const_binop): Use ulow () instead of elt (0).

From-SVN: r245841

gcc/ChangeLog

 2017-03-02  Richard Biener  <rguenther@suse.de>
 
+	* fold-const.c (const_binop): Use ulow () instead of elt (0).
+
+2017-03-02  Richard Biener  <rguenther@suse.de>
+
 	PR tree-optimization/79345
 	PR c++/42000
 	* tree-ssa-alias.c (walk_aliased_vdefs_1): Take a limit

gcc/fold-const.c

@@ -1249,7 +1249,7 @@ const_binop (enum tree_code code, tree arg1, tree arg2)
 	      return NULL_TREE;
 	    wide_int w2 = arg2;
 	    f2.data.high = w2.elt (1);
-	    f2.data.low = w2.elt (0);
+	    f2.data.low = w2.ulow ();
 	    f2.mode = SImode;
 	  }
 	  break;