tree-if-conv.c (is_false_predicate): For NULL_TREE return false rather than true.

	* tree-if-conv.c (is_false_predicate): For NULL_TREE return false
	rather than true.

From-SVN: r235272

gcc/ChangeLog

+2016-04-20  Marek Polacek  <polacek@redhat.com>
+
+	* tree-if-conv.c (is_false_predicate): For NULL_TREE return false
+	rather than true.
+
 2016-04-20  Ilya Enkovich  <ilya.enkovich@intel.com>
 
 	* config/i386/sse.md (vec_unpacks_lo_hi): Always

gcc/tree-if-conv.c

@@ -267,9 +267,9 @@ ifc_temp_var (tree type, tree expr, gimple_stmt_iterator *gsi)
 static inline bool
 is_false_predicate (tree cond)
 {
-  return (cond == NULL_TREE
-	  || cond == boolean_false_node
-	  || integer_zerop (cond));
+  return (cond != NULL_TREE
+	  && (cond == boolean_false_node
+	      || integer_zerop (cond)));
 }
 
 /* Return true when COND is a true predicate.  */