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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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package org.graalvm.compiler.nodes.calc;

import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
import static org.graalvm.compiler.nodes.calc.BinaryArithmeticNode.getArithmeticOpTable;

import org.graalvm.compiler.core.common.type.ArithmeticOpTable;
import org.graalvm.compiler.core.common.type.ArithmeticOpTable.UnaryOp;
import org.graalvm.compiler.core.common.type.ArithmeticOpTable.UnaryOp.Neg;
import org.graalvm.compiler.core.common.type.IntegerStamp;
import org.graalvm.compiler.core.common.type.FloatStamp;
import org.graalvm.compiler.core.common.type.Stamp;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.graph.spi.CanonicalizerTool;
import org.graalvm.compiler.lir.gen.ArithmeticLIRGeneratorTool;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.NodeView;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
import org.graalvm.compiler.nodes.spi.StampInverter;

The NegateNode node negates its operand.
/** * The {@code NegateNode} node negates its operand. */
@NodeInfo(cycles = CYCLES_2, size = SIZE_1) public final class NegateNode extends UnaryArithmeticNode<Neg> implements NarrowableArithmeticNode, StampInverter { public static final NodeClass<NegateNode> TYPE = NodeClass.create(NegateNode.class); public NegateNode(ValueNode value) { super(TYPE, getArithmeticOpTable(value).getNeg(), value); } public static ValueNode create(ValueNode value, NodeView view) { ValueNode synonym = findSynonym(value, view); if (synonym != null) { return synonym; } return new NegateNode(value); } @Override protected UnaryOp<Neg> getOp(ArithmeticOpTable table) { return table.getNeg(); } @Override public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) { ValueNode synonym = findSynonym(forValue, getOp(forValue)); if (synonym != null) { return synonym; } return this; } protected static ValueNode findSynonym(ValueNode forValue, NodeView view) { ArithmeticOpTable.UnaryOp<Neg> negOp = ArithmeticOpTable.forStamp(forValue.stamp(view)).getNeg(); // Folds constants ValueNode synonym = UnaryArithmeticNode.findSynonym(forValue, negOp); if (synonym != null) { return synonym; } if (forValue instanceof NegateNode) { return ((NegateNode) forValue).getValue(); } if (forValue instanceof SubNode && !(forValue.stamp(view) instanceof FloatStamp)) { SubNode sub = (SubNode) forValue; return SubNode.create(sub.getY(), sub.getX(), view); } // e.g. -(x >> 31) => x >>> 31 if (forValue instanceof RightShiftNode) { RightShiftNode shift = (RightShiftNode) forValue; Stamp stamp = forValue.stamp(view); if (shift.getY().isConstant() && stamp instanceof IntegerStamp) { int shiftAmount = shift.getY().asJavaConstant().asInt(); if (shiftAmount == ((IntegerStamp) stamp).getBits() - 1) { return UnsignedRightShiftNode.create(shift.getX(), shift.getY(), view); } } } return null; } @Override public void generate(NodeLIRBuilderTool nodeValueMap, ArithmeticLIRGeneratorTool gen) { nodeValueMap.setResult(this, gen.emitNegate(nodeValueMap.operand(getValue()))); } @Override public Stamp invertStamp(Stamp outStamp) { return getArithmeticOp().foldStamp(outStamp); } }