re PR tree-optimization/80374 (ICE in fold_convert_loc, at fold-const.c:2384)

2017-04-11  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/80374
	* tree-ssa-dom.c (derive_equivalences_from_bit_ior): Use
	build_zero_cst, remove fold_convertible_p check again.

From-SVN: r246840

gcc/ChangeLog

+2017-04-11  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/80374
+	* tree-ssa-dom.c (derive_equivalences_from_bit_ior): Use
+	build_zero_cst, remove fold_convertible_p check again.
+
 2017-04-11  Martin Liska  <mliska@suse.cz>
 
 	PR sanitizer/70878

gcc/tree-ssa-dom.c

@@ -701,13 +701,12 @@ derive_equivalences_from_bit_ior (tree name,
 				  const_and_copies *const_and_copies,
 				  int recursion_limit)
 {
-  if (recursion_limit == 0
-      || !fold_convertible_p (TREE_TYPE (name), integer_zero_node))
+  if (recursion_limit == 0)
     return;
 
   if (TREE_CODE (name) == SSA_NAME)
     {
-      tree value = fold_convert (TREE_TYPE (name), integer_zero_node);
+      tree value = build_zero_cst (TREE_TYPE (name));
 
       /* This records the equivalence for the toplevel object.  */
       record_equality (name, value, const_and_copies);