re PR tree-optimization/71031 (ICE in extract_range_from_binary_expr_1, at tree-vrp.c:2535 w/ -Os)

	PR tree-optimization/71031
	* tree-vrp.c (extract_range_from_binary_expr_1): Turn assert into a
	condition and adjust the code a bit.

	* gcc.dg/tree-ssa/vrp100.c: New test.

From-SVN: r236477

gcc/ChangeLog

+2016-05-19  Marek Polacek  <polacek@redhat.com>
+
+	PR tree-optimization/71031
+	* tree-vrp.c (extract_range_from_binary_expr_1): Turn assert into a
+	condition and adjust the code a bit.
+
 2016-05-19  Martin Liska  <mliska@suse.cz>
 
 	* tree-vect-stmts.c (vectorizable_simd_clone_call): Utilize

gcc/testsuite/ChangeLog

+2016-05-19  Marek Polacek  <polacek@redhat.com>
+
+	PR tree-optimization/71031
+	* gcc.dg/tree-ssa/vrp100.c: New test.
+
 2016-05-19  Ilya Enkovich  <ilya.enkovich@intel.com>
 
 	PR rtl-optimization/71148

gcc/testsuite/gcc.dg/tree-ssa/vrp100.c

+/* PR tree-optimization/71031 */
+/* { dg-do compile } */
+/* { dg-options "-Os" } */
+
+int zj;
+int **yr;
+
+void
+nn (void)
+{
+  unsigned int od = 4;
+
+  for (;;)
+    {
+      int lk;
+
+      for (lk = 0; lk < 2; ++lk)
+        {
+          static int cm;
+
+          zj = 0;
+          if (od == 0)
+            return;
+          ++od;
+          for (cm = 0; cm < 2; ++cm)
+            {
+              --od;
+              **yr = 0;
+            }
+        }
+    }
+}

gcc/tree-vrp.c

@@ -2519,20 +2519,13 @@ extract_range_from_binary_expr_1 (value_range *vr,
 		  min = wide_int_to_tree (expr_type, tmin);
 		  max = wide_int_to_tree (expr_type, tmax);
 		}
-	      else if (min_ovf == -1 && max_ovf == 1)
-		{
-		  /* Underflow and overflow, drop to VR_VARYING.  */
-		  set_value_range_to_varying (vr);
-		  return;
-		}
-	      else
+	      else if ((min_ovf == -1 && max_ovf == 0)
+		       || (max_ovf == 1 && min_ovf == 0))
 		{
 		  /* Min underflow or max overflow.  The range kind
 		     changes to VR_ANTI_RANGE.  */
 		  bool covers = false;
 		  wide_int tem = tmin;
-		  gcc_assert ((min_ovf == -1 && max_ovf == 0)
-			      || (max_ovf == 1 && min_ovf == 0));
 		  type = VR_ANTI_RANGE;
 		  tmin = tmax + 1;
 		  if (wi::cmp (tmin, tmax, sgn) < 0)
@@ -2551,6 +2544,12 @@ extract_range_from_binary_expr_1 (value_range *vr,
 		  min = wide_int_to_tree (expr_type, tmin);
 		  max = wide_int_to_tree (expr_type, tmax);
 		}
+	      else
+		{
+		  /* Other underflow and/or overflow, drop to VR_VARYING.  */
+		  set_value_range_to_varying (vr);
+		  return;
+		}
 	    }
 	  else
 	    {