--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/LoweredCompareAndSwapNode.java	2016-12-09 00:55:49.335064268 -0800
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2013, 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.
+ *
+ * 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.nodes.java;
+
+import static org.graalvm.compiler.nodeinfo.InputType.Memory;
+import static org.graalvm.compiler.nodeinfo.InputType.State;
+import static org.graalvm.compiler.nodeinfo.InputType.Value;
+import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_30;
+import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_8;
+
+import org.graalvm.compiler.core.common.LIRKind;
+import org.graalvm.compiler.core.common.LocationIdentity;
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.lir.gen.LIRGeneratorTool;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.FrameState;
+import org.graalvm.compiler.nodes.StateSplit;
+import org.graalvm.compiler.nodes.ValueNode;
+import org.graalvm.compiler.nodes.memory.FixedAccessNode;
+import org.graalvm.compiler.nodes.memory.MemoryCheckpoint;
+import org.graalvm.compiler.nodes.memory.address.AddressNode;
+import org.graalvm.compiler.nodes.spi.LIRLowerable;
+import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
+
+import jdk.vm.ci.meta.JavaConstant;
+import jdk.vm.ci.meta.JavaKind;
+import jdk.vm.ci.meta.Value;
+
+/**
+ * Represents the lowered version of an atomic compare-and-swap operation{@code CompareAndSwapNode}.
+ */
+@NodeInfo(allowedUsageTypes = {Value, Memory}, cycles = CYCLES_30, size = SIZE_8)
+public final class LoweredCompareAndSwapNode extends FixedAccessNode implements StateSplit, LIRLowerable, MemoryCheckpoint.Single {
+
+    public static final NodeClass<LoweredCompareAndSwapNode> TYPE = NodeClass.create(LoweredCompareAndSwapNode.class);
+    @Input ValueNode expectedValue;
+    @Input ValueNode newValue;
+    @OptionalInput(State) FrameState stateAfter;
+
+    @Override
+    public FrameState stateAfter() {
+        return stateAfter;
+    }
+
+    @Override
+    public void setStateAfter(FrameState x) {
+        assert x == null || x.isAlive() : "frame state must be in a graph";
+        updateUsages(stateAfter, x);
+        stateAfter = x;
+    }
+
+    @Override
+    public boolean hasSideEffect() {
+        return true;
+    }
+
+    public ValueNode getExpectedValue() {
+        return expectedValue;
+    }
+
+    public ValueNode getNewValue() {
+        return newValue;
+    }
+
+    public LoweredCompareAndSwapNode(AddressNode address, LocationIdentity location, ValueNode expectedValue, ValueNode newValue, BarrierType barrierType) {
+        super(TYPE, address, location, StampFactory.forKind(JavaKind.Boolean.getStackKind()), barrierType);
+        assert expectedValue.getStackKind() == newValue.getStackKind();
+        this.expectedValue = expectedValue;
+        this.newValue = newValue;
+    }
+
+    @Override
+    public boolean canNullCheck() {
+        return false;
+    }
+
+    @Override
+    public void generate(NodeLIRBuilderTool gen) {
+        assert getNewValue().stamp().isCompatible(getExpectedValue().stamp());
+        LIRGeneratorTool tool = gen.getLIRGeneratorTool();
+
+        LIRKind resultKind = tool.getLIRKind(stamp());
+        Value trueResult = tool.emitConstant(resultKind, JavaConstant.TRUE);
+        Value falseResult = tool.emitConstant(resultKind, JavaConstant.FALSE);
+        Value result = tool.emitCompareAndSwap(gen.operand(getAddress()), gen.operand(getExpectedValue()), gen.operand(getNewValue()), trueResult, falseResult);
+
+        gen.setResult(this, result);
+    }
+}