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The GraalVM compiler and the Graal-truffle optimizer.
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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * 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).
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package jdk.graal.compiler.nodes.java;

import static jdk.graal.compiler.nodeinfo.NodeCycles.CYCLES_8;
import static jdk.graal.compiler.nodeinfo.NodeSize.SIZE_8;

import org.graalvm.word.LocationIdentity;

import jdk.graal.compiler.core.common.memory.BarrierType;
import jdk.graal.compiler.core.common.memory.MemoryOrderMode;
import jdk.graal.compiler.graph.NodeClass;
import jdk.graal.compiler.lir.gen.LIRGeneratorTool;
import jdk.graal.compiler.nodeinfo.NodeInfo;
import jdk.graal.compiler.nodes.NodeView;
import jdk.graal.compiler.nodes.ValueNode;
import jdk.graal.compiler.nodes.memory.address.AddressNode;
import jdk.graal.compiler.nodes.spi.NodeLIRBuilderTool;
import jdk.vm.ci.meta.Value;

/**
 * A special purpose store node that differs from {@link LogicCompareAndSwapNode} in that it returns
 * either the expected value or the compared against value instead of a boolean.
 */
@NodeInfo(cycles = CYCLES_8, size = SIZE_8)
public final class ValueCompareAndSwapNode extends AbstractCompareAndSwapNode {
    public static final NodeClass TYPE = NodeClass.create(ValueCompareAndSwapNode.class);

    public ValueCompareAndSwapNode(AddressNode address, ValueNode expectedValue, ValueNode newValue, LocationIdentity location, BarrierType barrierType, MemoryOrderMode memoryOrder) {
        super(TYPE, address, location, expectedValue, newValue, barrierType, expectedValue.stamp(NodeView.DEFAULT).meet(newValue.stamp(NodeView.DEFAULT)).unrestricted(), memoryOrder);
    }

    @Override
    public void generate(NodeLIRBuilderTool gen) {
        assert getNewValue().stamp(NodeView.DEFAULT).isCompatible(getExpectedValue().stamp(NodeView.DEFAULT));
        LIRGeneratorTool tool = gen.getLIRGeneratorTool();
        assert !this.canDeoptimize();
        Value result = tool.emitValueCompareAndSwap(tool.getLIRKind(getAccessStamp(NodeView.DEFAULT)),
                        gen.operand(getAddress()), gen.operand(getExpectedValue()), gen.operand(getNewValue()), memoryOrder, getBarrierType());
        gen.setResult(this, result);
    }
}