8027444: mathExact: assert(i < _max) failed: oob: i=1, _max=1

Reviewed-by: duke

src/share/vm/opto/loopTransform.cpp

@@ -713,6 +713,10 @@ bool IdealLoopTree::policy_unroll( PhaseIdealLoop *phase ) const {
       case Op_ModL: body_size += 30; break;
       case Op_DivL: body_size += 30; break;
       case Op_MulL: body_size += 10; break;
+      case Op_FlagsProj:
+        // Can't handle unrolling of loops containing
+        // nodes that generate a FlagsProj at the moment
+        return false;
       case Op_StrComp:
       case Op_StrEquals:
       case Op_StrIndexOf:

test/compiler/intrinsics/mathexact/NestedMathExactTest.java

+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8027444
+ * @summary Test nested loops
+ * @compile NestedMathExactTest.java
+ * @run main NestedMathExactTest
+ *
+ */
+
+public class NestedMathExactTest {
+    public static final int LIMIT = 100;
+    public static int[] result = new int[LIMIT];
+    public static int value = 17;
+
+    public static void main(String[] args) {
+        for (int i = 0; i < 100; ++i) {
+            result[i] = runTest();
+        }
+    }
+
+    public static int runTest() {
+        int sum = 0;
+        for (int j = 0; j < 100000; j = Math.addExact(j, 1)) {
+            sum = 1;
+            for (int i = 0; i < 5; ++i) {
+                sum *= value;
+            }
+        }
+        return sum;
+    }
+}