re PR tree-optimization/68431 (Regression in GCC-6.0.0's optimizer)

	PR tree-optimization/68431
	* tree-vrp.c (extract_range_from_binary_expr_1): Fix condition.

	* gcc.dg/tree-ssa/pr68431.c: New test.

From-SVN: r230608

gcc/ChangeLog

+2015-11-19  Marek Polacek  <polacek@redhat.com>
+
+	PR tree-optimization/68431
+	* tree-vrp.c (extract_range_from_binary_expr_1): Fix condition.
+
 2015-11-19  Nathan Sidwell  <nathanacm.org>
 
 	* config/nvptx/nvptx.md (atomic_compare_and_swap<mode>_1,

gcc/testsuite/ChangeLog

+2015-11-19  Marek Polacek  <polacek@redhat.com>
+
+	PR tree-optimization/68431
+	* gcc.dg/tree-ssa/pr68431.c: New test.
+
 2015-11-19  Jakub Jelinek  <jakub@redhat.com>
 
 	PR rtl-optimization/68376

gcc/testsuite/gcc.dg/tree-ssa/pr68431.c

+/* PR tree-optimization/68431 */
+/* { dg-options "-O2 -fdump-tree-vrp1-details" } */
+
+unsigned int x = 1;
+int
+main (void)
+{
+  long long int a = -2LL;
+  int t = 1 <= (a / x);
+  if (t != 0)
+    __builtin_abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "Folding predicate .*to 0" 1 "vrp1" } } */

gcc/tree-vrp.c

@@ -2975,7 +2975,7 @@ extract_range_from_binary_expr_1 (value_range *vr,
 		  if (vr1.type == VR_RANGE
 		      && !symbolic_range_p (&vr0)
 		      && !symbolic_range_p (&vr1)
-		      && !compare_values (vr1.min, zero))
+		      && compare_values (vr1.min, zero) != 0)
 		    max = int_const_binop (code, vr0.max, vr1.min);
 		  else
 		    max = zero;