tree-vrp.c (extract_range_from_binary_expr_1): Initialze neg_*_op* variables.

       * tree-vrp.c (extract_range_from_binary_expr_1): Initialze
       neg_*_op* variables.

From-SVN: r262380

gcc/ChangeLog

+2018-07-04  Aldy Hernandez  <aldyh@redhat.com>
+
+	* tree-vrp.c (extract_range_from_binary_expr_1): Initialize
+	neg_*_op* variables.
+
 2018-07-04  Martin Liska  <mliska@suse.cz>
 
 	* tree-switch-conversion.c: Define

gcc/tree-vrp.c

@@ -1661,6 +1661,8 @@ extract_range_from_binary_expr_1 (value_range *vr,
       tree sym_max_op1 = NULL_TREE;
       bool neg_min_op0, neg_min_op1, neg_max_op0, neg_max_op1;
 
+      neg_min_op0 = neg_min_op1 = neg_max_op0 = neg_max_op1 = false;
+
       /* If we have a PLUS or MINUS with two VR_RANGEs, either constant or
 	 single-symbolic ranges, try to compute the precise resulting range,
 	 but only if we know that this resulting range will also be constant