--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.jtt/src/org/graalvm/compiler/jtt/optimize/UnsafeDeopt.java	2016-12-09 00:53:05.935861779 -0800
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 2007, 2012, 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.
+ */
+package org.graalvm.compiler.jtt.optimize;
+
+import java.lang.reflect.Field;
+import java.nio.ByteBuffer;
+
+import org.junit.Test;
+import org.junit.internal.AssumptionViolatedException;
+
+import org.graalvm.compiler.api.directives.GraalDirectives;
+import org.graalvm.compiler.jtt.JTTTest;
+
+import jdk.vm.ci.meta.ResolvedJavaMethod;
+import sun.misc.Unsafe;
+
+public class UnsafeDeopt extends JTTTest {
+    private static final Unsafe unsafe;
+
+    static {
+        try {
+            final Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");
+            unsafeField.setAccessible(true);
+            unsafe = (Unsafe) unsafeField.get(null);
+        } catch (Exception e) {
+            throw new Error(e);
+        }
+    }
+
+    public static int readWriteReadUnsafe(long addr, int m) {
+        int original = unsafe.getInt(addr);
+        if (original != 0) {
+            return -m;
+        }
+        unsafe.putInt(addr, m);
+        if (m > 10) {
+            if (m > 20) {
+                GraalDirectives.deoptimize();
+            }
+            unsafe.putInt(addr + 4, m);
+        }
+        return unsafe.getInt(addr);
+    }
+
+    public static int readWriteReadByteBuffer(ByteBuffer buffer, int m) {
+        int original = buffer.getInt(0);
+        if (original != 0) {
+            return -m;
+        }
+        buffer.putInt(0, m);
+        if (m > 10) {
+            if (m > 20) {
+                GraalDirectives.deoptimize();
+                buffer.putInt(4, m);
+            }
+        }
+        return buffer.getInt(0);
+    }
+
+    public long createBuffer() {
+        long addr = unsafe.allocateMemory(32);
+        unsafe.setMemory(addr, 32, (byte) 0);
+        return addr;
+    }
+
+    public void disposeBuffer(long addr) {
+        unsafe.freeMemory(addr);
+    }
+
+    @Test
+    public void testUnsafe() {
+        int m = 42;
+        long addr1 = createBuffer();
+        long addr2 = createBuffer();
+        try {
+            ResolvedJavaMethod method = getResolvedJavaMethod("readWriteReadUnsafe");
+            Object receiver = method.isStatic() ? null : this;
+            Result expect = executeExpected(method, receiver, addr1, m);
+            if (getCodeCache() == null) {
+                return;
+            }
+            testAgainstExpected(method, expect, receiver, addr2, m);
+        } catch (AssumptionViolatedException e) {
+            // Suppress so that subsequent calls to this method within the
+            // same Junit @Test annotated method can proceed.
+        } finally {
+            disposeBuffer(addr1);
+            disposeBuffer(addr2);
+        }
+    }
+
+    @Test
+    public void testByteBuffer() {
+        int m = 42;
+        try {
+            ResolvedJavaMethod method = getResolvedJavaMethod("readWriteReadByteBuffer");
+            Object receiver = method.isStatic() ? null : this;
+            Result expect = executeExpected(method, receiver, ByteBuffer.allocateDirect(32), m);
+            if (getCodeCache() == null) {
+                return;
+            }
+            ByteBuffer warmupBuffer = ByteBuffer.allocateDirect(32);
+            for (int i = 0; i < 10000; ++i) {
+                readWriteReadByteBuffer(warmupBuffer, (i % 50) + 1);
+                warmupBuffer.putInt(0, 0);
+            }
+            testAgainstExpected(method, expect, receiver, ByteBuffer.allocateDirect(32), m);
+        } catch (AssumptionViolatedException e) {
+            // Suppress so that subsequent calls to this method within the
+            // same Junit @Test annotated method can proceed.
+        }
+    }
+}