IntegerSubExactSplitNode.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package org.graalvm.compiler.replacements.nodes.arithmetic;

import org.graalvm.compiler.core.common.type.IntegerStamp;
import org.graalvm.compiler.core.common.type.Stamp;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.graph.spi.SimplifierTool;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.AbstractBeginNode;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.calc.SubNode;
import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;

import jdk.vm.ci.meta.Value;

@NodeInfo
public final class IntegerSubExactSplitNode extends IntegerExactArithmeticSplitNode {
    public static final NodeClass<IntegerSubExactSplitNode> TYPE = NodeClass.create(IntegerSubExactSplitNode.class);

    public IntegerSubExactSplitNode(Stamp stamp, ValueNode x, ValueNode y, AbstractBeginNode next, AbstractBeginNode overflowSuccessor) {
        super(TYPE, stamp, x, y, next, overflowSuccessor);
    }

    @Override
    protected Value generateArithmetic(NodeLIRBuilderTool gen) {
        return gen.getLIRGeneratorTool().getArithmetic().emitSub(gen.operand(getX()), gen.operand(getY()), true);
    }

    @Override
    public void simplify(SimplifierTool tool) {
        if (!IntegerStamp.subtractionCanOverflow((IntegerStamp) x.stamp(), (IntegerStamp) y.stamp())) {
            tool.deleteBranch(overflowSuccessor);
            tool.addToWorkList(next);
            SubNode replacement = graph().unique(new SubNode(x, y));
            graph().replaceSplitWithFloating(this, replacement, next);
            tool.addToWorkList(replacement);
        }
    }
}