--- /dev/null	2016-04-23 10:20:15.433000000 -0700
+++ new/test/compiler/unsafe/OpaqueAccesses.java	2016-10-24 05:16:06.157092731 -0700
@@ -0,0 +1,191 @@
+/*
+ * Copyright (c) 2016, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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 8155781
+ * @modules java.base/jdk.internal.misc
+ *
+ * @run main/bootclasspath/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions
+ *                                 -XX:-TieredCompilation -Xbatch
+ *                                 -XX:+UseCompressedOops -XX:+UseCompressedClassPointers
+ *                                 -XX:CompileCommand=dontinline,compiler.unsafe.OpaqueAccesses::test*
+ *                                 compiler.unsafe.OpaqueAccesses
+ * @run main/bootclasspath/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions
+ *                                 -XX:-TieredCompilation -Xbatch
+ *                                 -XX:+UseCompressedOops -XX:-UseCompressedClassPointers
+ *                                 -XX:CompileCommand=dontinline,compiler.unsafe.OpaqueAccesses::test*
+ *                                 compiler.unsafe.OpaqueAccesses
+ * @run main/bootclasspath/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions
+ *                                 -XX:-TieredCompilation -Xbatch
+ *                                 -XX:-UseCompressedOops -XX:+UseCompressedClassPointers
+ *                                 -XX:CompileCommand=dontinline,compiler.unsafe.OpaqueAccesses::test*
+ *                                 compiler.unsafe.OpaqueAccesses
+ * @run main/bootclasspath/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions
+ *                                 -XX:-TieredCompilation -Xbatch
+ *                                 -XX:-UseCompressedOops -XX:-UseCompressedClassPointers
+ *                                 -XX:CompileCommand=dontinline,compiler.unsafe.OpaqueAccesses::test*
+ *                                 compiler.unsafe.OpaqueAccesses
+ */
+package compiler.unsafe;
+
+import jdk.internal.misc.Unsafe;
+
+import java.lang.reflect.Field;
+
+public class OpaqueAccesses {
+    private static final Unsafe UNSAFE = Unsafe.getUnsafe();
+
+    private static final Object INSTANCE = new OpaqueAccesses();
+
+    private static final Object[] ARRAY = new Object[10];
+
+    private static final long F_OFFSET;
+    private static final long E_OFFSET;
+
+    static {
+        try {
+            Field field = OpaqueAccesses.class.getDeclaredField("f");
+            F_OFFSET = UNSAFE.objectFieldOffset(field);
+
+            E_OFFSET = UNSAFE.arrayBaseOffset(ARRAY.getClass());
+        } catch (NoSuchFieldException e) {
+            throw new Error(e);
+        }
+    }
+
+    private Object f = new Object();
+    private long l1, l2;
+
+    static Object testFixedOffsetField(Object o) {
+        return UNSAFE.getObject(o, F_OFFSET);
+    }
+
+    static int testFixedOffsetHeader0(Object o) {
+        return UNSAFE.getInt(o, 0);
+    }
+
+    static int testFixedOffsetHeader4(Object o) {
+        return UNSAFE.getInt(o, 4);
+    }
+
+    static int testFixedOffsetHeader8(Object o) {
+        return UNSAFE.getInt(o, 8);
+    }
+
+    static int testFixedOffsetHeader12(Object o) {
+        return UNSAFE.getInt(o, 12);
+    }
+
+    static int testFixedOffsetHeader16(Object o) {
+        return UNSAFE.getInt(o, 16);
+    }
+
+    static int testFixedOffsetHeader17(Object o) {
+        return UNSAFE.getIntUnaligned(o, 17);
+    }
+
+    static Object testFixedBase(long off) {
+        return UNSAFE.getObject(INSTANCE, off);
+    }
+
+    static Object testOpaque(Object o, long off) {
+        return UNSAFE.getObject(o, off);
+    }
+
+    static int testFixedOffsetHeaderArray0(Object[] arr) {
+        return UNSAFE.getInt(arr, 0);
+    }
+
+    static int testFixedOffsetHeaderArray4(Object[] arr) {
+        return UNSAFE.getInt(arr, 4);
+    }
+
+    static int testFixedOffsetHeaderArray8(Object[] arr) {
+        return UNSAFE.getInt(arr, 8);
+    }
+
+    static int testFixedOffsetHeaderArray12(Object[] arr) {
+        return UNSAFE.getInt(arr, 12);
+    }
+
+    static int testFixedOffsetHeaderArray16(Object[] arr) {
+        return UNSAFE.getInt(arr, 16);
+    }
+
+    static int testFixedOffsetHeaderArray17(Object[] arr) {
+        return UNSAFE.getIntUnaligned(arr, 17);
+    }
+
+    static Object testFixedOffsetArray(Object[] arr) {
+        return UNSAFE.getObject(arr, E_OFFSET);
+    }
+
+    static Object testFixedBaseArray(long off) {
+        return UNSAFE.getObject(ARRAY, off);
+    }
+
+    static Object testOpaqueArray(Object[] o, long off) {
+        return UNSAFE.getObject(o, off);
+    }
+
+    static final long ADDR = UNSAFE.allocateMemory(10);
+    static boolean flag;
+
+    static int testMixedAccess() {
+        flag = !flag;
+        Object o = (flag ? INSTANCE : null);
+        long off = (flag ? F_OFFSET : ADDR);
+        return UNSAFE.getInt(o, off);
+    }
+
+    public static void main(String[] args) {
+        for (int i = 0; i < 20_000; i++) {
+            // Instance
+            testFixedOffsetField(INSTANCE);
+            testFixedOffsetHeader0(INSTANCE);
+            testFixedOffsetHeader4(INSTANCE);
+            testFixedOffsetHeader8(INSTANCE);
+            testFixedOffsetHeader12(INSTANCE);
+            testFixedOffsetHeader16(INSTANCE);
+            testFixedOffsetHeader17(INSTANCE);
+            testFixedBase(F_OFFSET);
+            testOpaque(INSTANCE, F_OFFSET);
+            testMixedAccess();
+
+            // Array
+            testFixedOffsetHeaderArray0(ARRAY);
+            testFixedOffsetHeaderArray4(ARRAY);
+            testFixedOffsetHeaderArray8(ARRAY);
+            testFixedOffsetHeaderArray12(ARRAY);
+            testFixedOffsetHeaderArray16(ARRAY);
+            testFixedOffsetHeaderArray17(ARRAY);
+            testFixedOffsetArray(ARRAY);
+            testFixedBaseArray(E_OFFSET);
+            testOpaqueArray(ARRAY, E_OFFSET);
+        }
+        System.out.println("TEST PASSED");
+    }
+}