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/*
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* Copyright (c) 2009, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.nodes;
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import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
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import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_2;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Iterator;
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import java.util.List;
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import org.graalvm.compiler.core.common.calc.Condition;
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import org.graalvm.compiler.core.common.type.IntegerStamp;
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import org.graalvm.compiler.core.common.type.Stamp;
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import org.graalvm.compiler.core.common.type.StampFactory;
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import org.graalvm.compiler.debug.Debug;
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import org.graalvm.compiler.debug.DebugCounter;
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import org.graalvm.compiler.debug.GraalError;
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import org.graalvm.compiler.graph.Node;
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import org.graalvm.compiler.graph.NodeClass;
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import org.graalvm.compiler.graph.iterators.NodeIterable;
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import org.graalvm.compiler.graph.spi.Canonicalizable;
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import org.graalvm.compiler.graph.spi.Simplifiable;
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import org.graalvm.compiler.graph.spi.SimplifierTool;
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import org.graalvm.compiler.nodeinfo.InputType;
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import org.graalvm.compiler.nodeinfo.NodeInfo;
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import org.graalvm.compiler.nodes.calc.CompareNode;
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import org.graalvm.compiler.nodes.calc.ConditionalNode;
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import org.graalvm.compiler.nodes.calc.IntegerBelowNode;
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import org.graalvm.compiler.nodes.calc.IntegerEqualsNode;
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import org.graalvm.compiler.nodes.calc.IntegerLessThanNode;
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import org.graalvm.compiler.nodes.calc.IsNullNode;
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import org.graalvm.compiler.nodes.calc.NormalizeCompareNode;
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import org.graalvm.compiler.nodes.java.InstanceOfNode;
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import org.graalvm.compiler.nodes.spi.LIRLowerable;
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import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
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import org.graalvm.compiler.nodes.util.GraphUtil;
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import org.graalvm.util.EconomicMap;
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import org.graalvm.util.Equivalence;
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import jdk.vm.ci.meta.Constant;
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import jdk.vm.ci.meta.ConstantReflectionProvider;
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import jdk.vm.ci.meta.JavaConstant;
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import jdk.vm.ci.meta.JavaKind;
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import jdk.vm.ci.meta.PrimitiveConstant;
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/**
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* The {@code IfNode} represents a branch that can go one of two directions depending on the outcome
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* of a comparison.
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*/
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@NodeInfo(cycles = CYCLES_2, size = SIZE_2, sizeRationale = "2 jmps")
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public final class IfNode extends ControlSplitNode implements Simplifiable, LIRLowerable {
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public static final NodeClass<IfNode> TYPE = NodeClass.create(IfNode.class);
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private static final DebugCounter CORRECTED_PROBABILITIES = Debug.counter("CorrectedProbabilities");
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@Successor AbstractBeginNode trueSuccessor;
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@Successor AbstractBeginNode falseSuccessor;
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@Input(InputType.Condition) LogicNode condition;
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protected double trueSuccessorProbability;
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public LogicNode condition() {
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return condition;
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}
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public void setCondition(LogicNode x) {
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updateUsages(condition, x);
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condition = x;
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}
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public IfNode(LogicNode condition, FixedNode trueSuccessor, FixedNode falseSuccessor, double trueSuccessorProbability) {
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this(condition, BeginNode.begin(trueSuccessor), BeginNode.begin(falseSuccessor), trueSuccessorProbability);
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}
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public IfNode(LogicNode condition, AbstractBeginNode trueSuccessor, AbstractBeginNode falseSuccessor, double trueSuccessorProbability) {
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super(TYPE, StampFactory.forVoid());
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this.condition = condition;
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this.falseSuccessor = falseSuccessor;
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this.trueSuccessor = trueSuccessor;
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setTrueSuccessorProbability(trueSuccessorProbability);
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}
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/**
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* Gets the true successor.
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*
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* @return the true successor
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*/
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public AbstractBeginNode trueSuccessor() {
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return trueSuccessor;
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}
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/**
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* Gets the false successor.
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*
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* @return the false successor
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*/
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public AbstractBeginNode falseSuccessor() {
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return falseSuccessor;
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}
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public double getTrueSuccessorProbability() {
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return this.trueSuccessorProbability;
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}
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public void setTrueSuccessor(AbstractBeginNode node) {
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updatePredecessor(trueSuccessor, node);
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trueSuccessor = node;
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}
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public void setFalseSuccessor(AbstractBeginNode node) {
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updatePredecessor(falseSuccessor, node);
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falseSuccessor = node;
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}
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/**
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* Gets the node corresponding to the specified outcome of the branch.
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*
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* @param istrue {@code true} if the true successor is requested, {@code false} otherwise
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* @return the corresponding successor
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*/
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public AbstractBeginNode successor(boolean istrue) {
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return istrue ? trueSuccessor : falseSuccessor;
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}
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public void setTrueSuccessorProbability(double prob) {
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assert prob >= -0.000000001 && prob <= 1.000000001 : "Probability out of bounds: " + prob;
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trueSuccessorProbability = Math.min(1.0, Math.max(0.0, prob));
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}
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@Override
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public double probability(AbstractBeginNode successor) {
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return successor == trueSuccessor ? trueSuccessorProbability : 1 - trueSuccessorProbability;
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}
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@Override
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public void generate(NodeLIRBuilderTool gen) {
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gen.emitIf(this);
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}
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@Override
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public boolean verify() {
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assertTrue(condition() != null, "missing condition");
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assertTrue(trueSuccessor() != null, "missing trueSuccessor");
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assertTrue(falseSuccessor() != null, "missing falseSuccessor");
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return super.verify();
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}
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public void eliminateNegation() {
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AbstractBeginNode oldTrueSuccessor = trueSuccessor;
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AbstractBeginNode oldFalseSuccessor = falseSuccessor;
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trueSuccessor = oldFalseSuccessor;
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falseSuccessor = oldTrueSuccessor;
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trueSuccessorProbability = 1 - trueSuccessorProbability;
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setCondition(((LogicNegationNode) condition).getValue());
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}
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@Override
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public void simplify(SimplifierTool tool) {
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if (trueSuccessor().next() instanceof DeoptimizeNode) {
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if (trueSuccessorProbability != 0) {
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CORRECTED_PROBABILITIES.increment();
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trueSuccessorProbability = 0;
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}
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} else if (falseSuccessor().next() instanceof DeoptimizeNode) {
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if (trueSuccessorProbability != 1) {
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CORRECTED_PROBABILITIES.increment();
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trueSuccessorProbability = 1;
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}
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}
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if (condition() instanceof LogicNegationNode) {
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eliminateNegation();
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}
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if (condition() instanceof LogicConstantNode) {
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LogicConstantNode c = (LogicConstantNode) condition();
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if (c.getValue()) {
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tool.deleteBranch(falseSuccessor());
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tool.addToWorkList(trueSuccessor());
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graph().removeSplit(this, trueSuccessor());
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} else {
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tool.deleteBranch(trueSuccessor());
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tool.addToWorkList(falseSuccessor());
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graph().removeSplit(this, falseSuccessor());
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}
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return;
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}
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if (tool.allUsagesAvailable() && trueSuccessor().hasNoUsages() && falseSuccessor().hasNoUsages()) {
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pushNodesThroughIf(tool);
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if (checkForUnsignedCompare(tool) || removeOrMaterializeIf(tool)) {
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return;
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}
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}
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if (removeIntermediateMaterialization(tool)) {
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return;
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}
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if (splitIfAtPhi(tool)) {
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return;
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}
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if (conditionalNodeOptimization(tool)) {
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return;
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}
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if (falseSuccessor().hasNoUsages() && (!(falseSuccessor() instanceof LoopExitNode)) && falseSuccessor().next() instanceof IfNode) {
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AbstractBeginNode intermediateBegin = falseSuccessor();
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IfNode nextIf = (IfNode) intermediateBegin.next();
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double probabilityB = (1.0 - this.trueSuccessorProbability) * nextIf.trueSuccessorProbability;
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if (this.trueSuccessorProbability < probabilityB) {
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// Reordering of those two if statements is beneficial from the point of view of
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// their probabilities.
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if (prepareForSwap(tool.getConstantReflection(), condition(), nextIf.condition())) {
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// Reordering is allowed from (if1 => begin => if2) to (if2 => begin => if1).
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assert intermediateBegin.next() == nextIf;
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AbstractBeginNode bothFalseBegin = nextIf.falseSuccessor();
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nextIf.setFalseSuccessor(null);
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intermediateBegin.setNext(null);
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this.setFalseSuccessor(null);
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this.replaceAtPredecessor(nextIf);
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nextIf.setFalseSuccessor(intermediateBegin);
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intermediateBegin.setNext(this);
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this.setFalseSuccessor(bothFalseBegin);
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nextIf.setTrueSuccessorProbability(probabilityB);
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if (probabilityB == 1.0) {
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this.setTrueSuccessorProbability(0.0);
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} else {
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double newProbability = this.trueSuccessorProbability / (1.0 - probabilityB);
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this.setTrueSuccessorProbability(Math.min(1.0, newProbability));
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}
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return;
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}
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}
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}
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}
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/**
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* Try to optimize this as if it were a {@link ConditionalNode}.
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*/
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private boolean conditionalNodeOptimization(SimplifierTool tool) {
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if (trueSuccessor().next() instanceof AbstractEndNode && falseSuccessor().next() instanceof AbstractEndNode) {
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AbstractEndNode trueEnd = (AbstractEndNode) trueSuccessor().next();
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AbstractEndNode falseEnd = (AbstractEndNode) falseSuccessor().next();
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if (trueEnd.merge() != falseEnd.merge()) {
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return false;
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}
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if (!(trueEnd.merge() instanceof MergeNode)) {
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return false;
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}
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MergeNode merge = (MergeNode) trueEnd.merge();
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if (merge.usages().count() != 1 || merge.phis().count() != 1) {
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return false;
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}
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if (trueSuccessor().anchored().isNotEmpty() || falseSuccessor().anchored().isNotEmpty()) {
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return false;
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}
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PhiNode phi = merge.phis().first();
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ValueNode falseValue = phi.valueAt(falseEnd);
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ValueNode trueValue = phi.valueAt(trueEnd);
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ValueNode result = ConditionalNode.canonicalizeConditional(condition, trueValue, falseValue, phi.stamp());
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if (result != null) {
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/*
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* canonicalizeConditional returns possibly new nodes so add them to the graph.
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*/
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if (result.graph() == null) {
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result = graph().addOrUniqueWithInputs(result);
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}
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/*
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* This optimization can be performed even if multiple values merge at this phi
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* since the two inputs get simplified into one.
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*/
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phi.setValueAt(trueEnd, result);
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removeThroughFalseBranch(tool);
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return true;
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}
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}
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return false;
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}
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private void pushNodesThroughIf(SimplifierTool tool) {
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assert trueSuccessor().hasNoUsages() && falseSuccessor().hasNoUsages();
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// push similar nodes upwards through the if, thereby deduplicating them
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do {
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AbstractBeginNode trueSucc = trueSuccessor();
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AbstractBeginNode falseSucc = falseSuccessor();
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if (trueSucc instanceof BeginNode && falseSucc instanceof BeginNode && trueSucc.next() instanceof FixedWithNextNode && falseSucc.next() instanceof FixedWithNextNode) {
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FixedWithNextNode trueNext = (FixedWithNextNode) trueSucc.next();
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FixedWithNextNode falseNext = (FixedWithNextNode) falseSucc.next();
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NodeClass<?> nodeClass = trueNext.getNodeClass();
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if (trueNext.getClass() == falseNext.getClass()) {
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if (nodeClass.equalInputs(trueNext, falseNext) && trueNext.valueEquals(falseNext)) {
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falseNext.replaceAtUsages(trueNext);
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graph().removeFixed(falseNext);
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GraphUtil.unlinkFixedNode(trueNext);
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graph().addBeforeFixed(this, trueNext);
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for (Node usage : trueNext.usages().snapshot()) {
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if (usage.isAlive()) {
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NodeClass<?> usageNodeClass = usage.getNodeClass();
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if (usageNodeClass.valueNumberable() && !usageNodeClass.isLeafNode()) {
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Node newNode = graph().findDuplicate(usage);
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if (newNode != null) {
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usage.replaceAtUsagesAndDelete(newNode);
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}
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}
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if (usage.isAlive()) {
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tool.addToWorkList(usage);
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}
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}
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}
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continue;
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}
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}
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}
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break;
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} while (true);
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}
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/**
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* Recognize a couple patterns that can be merged into an unsigned compare.
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*
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* @param tool
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* @return true if a replacement was done.
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*/
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private boolean checkForUnsignedCompare(SimplifierTool tool) {
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assert trueSuccessor().hasNoUsages() && falseSuccessor().hasNoUsages();
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if (condition() instanceof IntegerLessThanNode) {
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IntegerLessThanNode lessThan = (IntegerLessThanNode) condition();
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Constant y = lessThan.getY().stamp().asConstant();
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if (y instanceof PrimitiveConstant && ((PrimitiveConstant) y).asLong() == 0 && falseSuccessor().next() instanceof IfNode) {
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IfNode ifNode2 = (IfNode) falseSuccessor().next();
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if (ifNode2.condition() instanceof IntegerLessThanNode) {
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IntegerLessThanNode lessThan2 = (IntegerLessThanNode) ifNode2.condition();
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AbstractBeginNode falseSucc = ifNode2.falseSuccessor();
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AbstractBeginNode trueSucc = ifNode2.trueSuccessor();
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IntegerBelowNode below = null;
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/*
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* Convert x >= 0 && x < positive which is represented as !(x < 0) && x <
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* <positive> into an unsigned compare.
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*/
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if (lessThan2.getX() == lessThan.getX() && lessThan2.getY().stamp() instanceof IntegerStamp && ((IntegerStamp) lessThan2.getY().stamp()).isPositive() &&
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sameDestination(trueSuccessor(), ifNode2.falseSuccessor)) {
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below = graph().unique(new IntegerBelowNode(lessThan2.getX(), lessThan2.getY()));
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// swap direction
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AbstractBeginNode tmp = falseSucc;
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falseSucc = trueSucc;
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trueSucc = tmp;
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} else if (lessThan2.getY() == lessThan.getX() && sameDestination(trueSuccessor(), ifNode2.trueSuccessor)) {
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/*
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* Convert x >= 0 && x <= positive which is represented as !(x < 0) &&
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* !(<positive> > x), into x <| positive + 1. This can only be done for
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* constants since there isn't a IntegerBelowEqualThanNode but that doesn't
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* appear to be interesting.
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*/
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JavaConstant positive = lessThan2.getX().asJavaConstant();
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if (positive != null && positive.asLong() > 0 && positive.asLong() < positive.getJavaKind().getMaxValue()) {
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|
384 |
ConstantNode newLimit = ConstantNode.forIntegerStamp(lessThan2.getX().stamp(), positive.asLong() + 1, graph());
|
|
385 |
below = graph().unique(new IntegerBelowNode(lessThan.getX(), newLimit));
|
|
386 |
}
|
|
387 |
}
|
|
388 |
if (below != null) {
|
|
389 |
ifNode2.setTrueSuccessor(null);
|
|
390 |
ifNode2.setFalseSuccessor(null);
|
|
391 |
|
|
392 |
IfNode newIfNode = graph().add(new IfNode(below, falseSucc, trueSucc, 1 - trueSuccessorProbability));
|
|
393 |
// Remove the < 0 test.
|
|
394 |
tool.deleteBranch(trueSuccessor);
|
|
395 |
graph().removeSplit(this, falseSuccessor);
|
|
396 |
|
|
397 |
// Replace the second test with the new one.
|
|
398 |
ifNode2.predecessor().replaceFirstSuccessor(ifNode2, newIfNode);
|
|
399 |
ifNode2.safeDelete();
|
|
400 |
return true;
|
|
401 |
}
|
|
402 |
}
|
|
403 |
}
|
|
404 |
}
|
|
405 |
return false;
|
|
406 |
}
|
|
407 |
|
|
408 |
/**
|
|
409 |
* Check it these two blocks end up at the same place. Meeting at the same merge, or
|
|
410 |
* deoptimizing in the same way.
|
|
411 |
*/
|
|
412 |
private static boolean sameDestination(AbstractBeginNode succ1, AbstractBeginNode succ2) {
|
|
413 |
Node next1 = succ1.next();
|
|
414 |
Node next2 = succ2.next();
|
|
415 |
if (next1 instanceof EndNode && next2 instanceof EndNode) {
|
|
416 |
EndNode end1 = (EndNode) next1;
|
|
417 |
EndNode end2 = (EndNode) next2;
|
|
418 |
if (end1.merge() == end2.merge()) {
|
|
419 |
for (PhiNode phi : end1.merge().phis()) {
|
|
420 |
if (phi.valueAt(end1) != phi.valueAt(end2)) {
|
|
421 |
return false;
|
|
422 |
}
|
|
423 |
}
|
|
424 |
// They go to the same MergeNode and merge the same values
|
|
425 |
return true;
|
|
426 |
}
|
|
427 |
} else if (next1 instanceof DeoptimizeNode && next2 instanceof DeoptimizeNode) {
|
|
428 |
DeoptimizeNode deopt1 = (DeoptimizeNode) next1;
|
|
429 |
DeoptimizeNode deopt2 = (DeoptimizeNode) next2;
|
|
430 |
if (deopt1.reason() == deopt2.reason() && deopt1.action() == deopt2.action()) {
|
|
431 |
// Same deoptimization reason and action.
|
|
432 |
return true;
|
|
433 |
}
|
|
434 |
} else if (next1 instanceof LoopExitNode && next2 instanceof LoopExitNode) {
|
|
435 |
LoopExitNode exit1 = (LoopExitNode) next1;
|
|
436 |
LoopExitNode exit2 = (LoopExitNode) next2;
|
|
437 |
if (exit1.loopBegin() == exit2.loopBegin() && exit1.stateAfter() == exit2.stateAfter() && exit1.stateAfter() == null && sameDestination(exit1, exit2)) {
|
|
438 |
// Exit the same loop and end up at the same place.
|
|
439 |
return true;
|
|
440 |
}
|
|
441 |
} else if (next1 instanceof ReturnNode && next2 instanceof ReturnNode) {
|
|
442 |
ReturnNode exit1 = (ReturnNode) next1;
|
|
443 |
ReturnNode exit2 = (ReturnNode) next2;
|
|
444 |
if (exit1.result() == exit2.result()) {
|
|
445 |
// Exit the same loop and end up at the same place.
|
|
446 |
return true;
|
|
447 |
}
|
|
448 |
}
|
|
449 |
return false;
|
|
450 |
}
|
|
451 |
|
|
452 |
private static boolean prepareForSwap(ConstantReflectionProvider constantReflection, LogicNode a, LogicNode b) {
|
|
453 |
if (a instanceof InstanceOfNode) {
|
|
454 |
InstanceOfNode instanceOfA = (InstanceOfNode) a;
|
|
455 |
if (b instanceof IsNullNode) {
|
|
456 |
IsNullNode isNullNode = (IsNullNode) b;
|
|
457 |
if (isNullNode.getValue() == instanceOfA.getValue()) {
|
|
458 |
Debug.log("Can swap instanceof and isnull if");
|
|
459 |
return true;
|
|
460 |
}
|
|
461 |
} else if (b instanceof InstanceOfNode) {
|
|
462 |
InstanceOfNode instanceOfB = (InstanceOfNode) b;
|
|
463 |
if (instanceOfA.getValue() == instanceOfB.getValue() && !instanceOfA.type().getType().isInterface() && !instanceOfB.type().getType().isInterface() &&
|
|
464 |
!instanceOfA.type().getType().isAssignableFrom(instanceOfB.type().getType()) && !instanceOfB.type().getType().isAssignableFrom(instanceOfA.type().getType())) {
|
|
465 |
// Two instanceof on the same value with mutually exclusive types.
|
|
466 |
Debug.log("Can swap instanceof for types %s and %s", instanceOfA.type(), instanceOfB.type());
|
|
467 |
return true;
|
|
468 |
}
|
|
469 |
}
|
|
470 |
} else if (a instanceof CompareNode) {
|
|
471 |
CompareNode compareA = (CompareNode) a;
|
|
472 |
Condition conditionA = compareA.condition();
|
|
473 |
if (compareA.unorderedIsTrue()) {
|
|
474 |
return false;
|
|
475 |
}
|
|
476 |
if (b instanceof CompareNode) {
|
|
477 |
CompareNode compareB = (CompareNode) b;
|
|
478 |
if (compareA == compareB) {
|
|
479 |
Debug.log("Same conditions => do not swap and leave the work for global value numbering.");
|
|
480 |
return false;
|
|
481 |
}
|
|
482 |
if (compareB.unorderedIsTrue()) {
|
|
483 |
return false;
|
|
484 |
}
|
|
485 |
Condition comparableCondition = null;
|
|
486 |
Condition conditionB = compareB.condition();
|
|
487 |
if (compareB.getX() == compareA.getX() && compareB.getY() == compareA.getY()) {
|
|
488 |
comparableCondition = conditionB;
|
|
489 |
} else if (compareB.getX() == compareA.getY() && compareB.getY() == compareA.getX()) {
|
|
490 |
comparableCondition = conditionB.mirror();
|
|
491 |
}
|
|
492 |
|
|
493 |
if (comparableCondition != null) {
|
|
494 |
Condition combined = conditionA.join(comparableCondition);
|
|
495 |
if (combined == null) {
|
|
496 |
// The two conditions are disjoint => can reorder.
|
|
497 |
Debug.log("Can swap disjoint coditions on same values: %s and %s", conditionA, comparableCondition);
|
|
498 |
return true;
|
|
499 |
}
|
|
500 |
} else if (conditionA == Condition.EQ && conditionB == Condition.EQ) {
|
|
501 |
boolean canSwap = false;
|
|
502 |
if ((compareA.getX() == compareB.getX() && valuesDistinct(constantReflection, compareA.getY(), compareB.getY()))) {
|
|
503 |
canSwap = true;
|
|
504 |
} else if ((compareA.getX() == compareB.getY() && valuesDistinct(constantReflection, compareA.getY(), compareB.getX()))) {
|
|
505 |
canSwap = true;
|
|
506 |
} else if ((compareA.getY() == compareB.getX() && valuesDistinct(constantReflection, compareA.getX(), compareB.getY()))) {
|
|
507 |
canSwap = true;
|
|
508 |
} else if ((compareA.getY() == compareB.getY() && valuesDistinct(constantReflection, compareA.getX(), compareB.getX()))) {
|
|
509 |
canSwap = true;
|
|
510 |
}
|
|
511 |
|
|
512 |
if (canSwap) {
|
|
513 |
Debug.log("Can swap equality condition with one shared and one disjoint value.");
|
|
514 |
return true;
|
|
515 |
}
|
|
516 |
}
|
|
517 |
}
|
|
518 |
}
|
|
519 |
|
|
520 |
return false;
|
|
521 |
}
|
|
522 |
|
|
523 |
private static boolean valuesDistinct(ConstantReflectionProvider constantReflection, ValueNode a, ValueNode b) {
|
|
524 |
if (a.isConstant() && b.isConstant()) {
|
|
525 |
Boolean equal = constantReflection.constantEquals(a.asConstant(), b.asConstant());
|
|
526 |
if (equal != null) {
|
|
527 |
return !equal.booleanValue();
|
|
528 |
}
|
|
529 |
}
|
|
530 |
|
|
531 |
Stamp stampA = a.stamp();
|
|
532 |
Stamp stampB = b.stamp();
|
|
533 |
return stampA.alwaysDistinct(stampB);
|
|
534 |
}
|
|
535 |
|
|
536 |
/**
|
|
537 |
* Tries to remove an empty if construct or replace an if construct with a materialization.
|
|
538 |
*
|
|
539 |
* @return true if a transformation was made, false otherwise
|
|
540 |
*/
|
|
541 |
private boolean removeOrMaterializeIf(SimplifierTool tool) {
|
|
542 |
assert trueSuccessor().hasNoUsages() && falseSuccessor().hasNoUsages();
|
|
543 |
if (trueSuccessor().next() instanceof AbstractEndNode && falseSuccessor().next() instanceof AbstractEndNode) {
|
|
544 |
AbstractEndNode trueEnd = (AbstractEndNode) trueSuccessor().next();
|
|
545 |
AbstractEndNode falseEnd = (AbstractEndNode) falseSuccessor().next();
|
|
546 |
AbstractMergeNode merge = trueEnd.merge();
|
|
547 |
if (merge == falseEnd.merge() && trueSuccessor().anchored().isEmpty() && falseSuccessor().anchored().isEmpty()) {
|
|
548 |
PhiNode singlePhi = null;
|
|
549 |
int distinct = 0;
|
|
550 |
for (PhiNode phi : merge.phis()) {
|
|
551 |
ValueNode trueValue = phi.valueAt(trueEnd);
|
|
552 |
ValueNode falseValue = phi.valueAt(falseEnd);
|
|
553 |
if (trueValue != falseValue) {
|
|
554 |
distinct++;
|
|
555 |
singlePhi = phi;
|
|
556 |
}
|
|
557 |
}
|
|
558 |
if (distinct == 0) {
|
|
559 |
/*
|
|
560 |
* Multiple phis but merging same values for true and false, so simply delete
|
|
561 |
* the path
|
|
562 |
*/
|
|
563 |
removeThroughFalseBranch(tool);
|
|
564 |
return true;
|
|
565 |
} else if (distinct == 1) {
|
|
566 |
ValueNode trueValue = singlePhi.valueAt(trueEnd);
|
|
567 |
ValueNode falseValue = singlePhi.valueAt(falseEnd);
|
46344
|
568 |
ValueNode conditional = canonicalizeConditionalCascade(trueValue, falseValue);
|
43972
|
569 |
if (conditional != null) {
|
|
570 |
singlePhi.setValueAt(trueEnd, conditional);
|
|
571 |
removeThroughFalseBranch(tool);
|
|
572 |
return true;
|
|
573 |
}
|
|
574 |
}
|
|
575 |
}
|
|
576 |
}
|
|
577 |
if (trueSuccessor().next() instanceof ReturnNode && falseSuccessor().next() instanceof ReturnNode) {
|
|
578 |
ReturnNode trueEnd = (ReturnNode) trueSuccessor().next();
|
|
579 |
ReturnNode falseEnd = (ReturnNode) falseSuccessor().next();
|
|
580 |
ValueNode trueValue = trueEnd.result();
|
|
581 |
ValueNode falseValue = falseEnd.result();
|
|
582 |
ValueNode value = null;
|
|
583 |
if (trueValue != null) {
|
|
584 |
if (trueValue == falseValue) {
|
|
585 |
value = trueValue;
|
|
586 |
} else {
|
|
587 |
value = canonicalizeConditionalCascade(trueValue, falseValue);
|
|
588 |
if (value == null) {
|
|
589 |
return false;
|
|
590 |
}
|
|
591 |
}
|
|
592 |
}
|
|
593 |
ReturnNode newReturn = graph().add(new ReturnNode(value));
|
|
594 |
replaceAtPredecessor(newReturn);
|
|
595 |
GraphUtil.killCFG(this);
|
|
596 |
return true;
|
|
597 |
}
|
|
598 |
return false;
|
|
599 |
}
|
|
600 |
|
|
601 |
protected void removeThroughFalseBranch(SimplifierTool tool) {
|
|
602 |
AbstractBeginNode trueBegin = trueSuccessor();
|
|
603 |
graph().removeSplitPropagate(this, trueBegin, tool);
|
|
604 |
tool.addToWorkList(trueBegin);
|
46344
|
605 |
if (condition() != null) {
|
|
606 |
GraphUtil.tryKillUnused(condition());
|
43972
|
607 |
}
|
|
608 |
}
|
|
609 |
|
46344
|
610 |
private ValueNode canonicalizeConditionalCascade(ValueNode trueValue, ValueNode falseValue) {
|
43972
|
611 |
if (trueValue.getStackKind() != falseValue.getStackKind()) {
|
|
612 |
return null;
|
|
613 |
}
|
|
614 |
if (trueValue.getStackKind() != JavaKind.Int && trueValue.getStackKind() != JavaKind.Long) {
|
|
615 |
return null;
|
|
616 |
}
|
|
617 |
if (trueValue.isConstant() && falseValue.isConstant()) {
|
|
618 |
return graph().unique(new ConditionalNode(condition(), trueValue, falseValue));
|
|
619 |
} else {
|
|
620 |
ConditionalNode conditional = null;
|
|
621 |
ValueNode constant = null;
|
|
622 |
boolean negateCondition;
|
|
623 |
if (trueValue instanceof ConditionalNode && falseValue.isConstant()) {
|
|
624 |
conditional = (ConditionalNode) trueValue;
|
|
625 |
constant = falseValue;
|
|
626 |
negateCondition = true;
|
|
627 |
} else if (falseValue instanceof ConditionalNode && trueValue.isConstant()) {
|
|
628 |
conditional = (ConditionalNode) falseValue;
|
|
629 |
constant = trueValue;
|
|
630 |
negateCondition = false;
|
|
631 |
} else {
|
|
632 |
return null;
|
|
633 |
}
|
46344
|
634 |
boolean negateConditionalCondition = false;
|
|
635 |
ValueNode otherValue = null;
|
43972
|
636 |
if (constant == conditional.trueValue()) {
|
|
637 |
otherValue = conditional.falseValue();
|
|
638 |
negateConditionalCondition = false;
|
|
639 |
} else if (constant == conditional.falseValue()) {
|
|
640 |
otherValue = conditional.trueValue();
|
|
641 |
negateConditionalCondition = true;
|
|
642 |
}
|
46344
|
643 |
if (otherValue != null) {
|
|
644 |
if (otherValue.isConstant() && graph().allowShortCircuitOr()) {
|
|
645 |
double shortCutProbability = probability(trueSuccessor());
|
|
646 |
LogicNode newCondition = LogicNode.or(condition(), negateCondition, conditional.condition(), negateConditionalCondition, shortCutProbability);
|
|
647 |
return graph().unique(new ConditionalNode(newCondition, constant, otherValue));
|
|
648 |
}
|
|
649 |
} else if (!negateCondition && constant.isJavaConstant() && conditional.trueValue().isJavaConstant() && conditional.falseValue().isJavaConstant()) {
|
|
650 |
IntegerLessThanNode lessThan = null;
|
|
651 |
IntegerEqualsNode equals = null;
|
|
652 |
if (condition() instanceof IntegerLessThanNode && conditional.condition() instanceof IntegerEqualsNode && constant.asJavaConstant().asLong() == -1 &&
|
|
653 |
conditional.trueValue().asJavaConstant().asLong() == 0 && conditional.falseValue().asJavaConstant().asLong() == 1) {
|
|
654 |
lessThan = (IntegerLessThanNode) condition();
|
|
655 |
equals = (IntegerEqualsNode) conditional.condition();
|
|
656 |
} else if (condition() instanceof IntegerEqualsNode && conditional.condition() instanceof IntegerLessThanNode && constant.asJavaConstant().asLong() == 0 &&
|
|
657 |
conditional.trueValue().asJavaConstant().asLong() == -1 && conditional.falseValue().asJavaConstant().asLong() == 1) {
|
|
658 |
lessThan = (IntegerLessThanNode) conditional.condition();
|
|
659 |
equals = (IntegerEqualsNode) condition();
|
|
660 |
}
|
|
661 |
if (lessThan != null) {
|
|
662 |
assert equals != null;
|
|
663 |
if ((lessThan.getX() == equals.getX() && lessThan.getY() == equals.getY()) || (lessThan.getX() == equals.getY() && lessThan.getY() == equals.getX())) {
|
|
664 |
return graph().unique(new NormalizeCompareNode(lessThan.getX(), lessThan.getY(), false));
|
|
665 |
}
|
|
666 |
}
|
43972
|
667 |
}
|
|
668 |
}
|
|
669 |
return null;
|
|
670 |
}
|
|
671 |
|
|
672 |
/**
|
|
673 |
* Take an if that is immediately dominated by a merge with a single phi and split off any paths
|
|
674 |
* where the test would be statically decidable creating a new merge below the approriate side
|
|
675 |
* of the IfNode. Any undecidable tests will continue to use the original IfNode.
|
|
676 |
*
|
|
677 |
* @param tool
|
|
678 |
*/
|
|
679 |
private boolean splitIfAtPhi(SimplifierTool tool) {
|
46344
|
680 |
if (graph().getGuardsStage().areFrameStatesAtSideEffects()) {
|
|
681 |
// Disabled until we make sure we have no FrameState-less merges at this stage
|
|
682 |
return false;
|
|
683 |
}
|
|
684 |
|
43972
|
685 |
if (!(predecessor() instanceof MergeNode)) {
|
|
686 |
return false;
|
|
687 |
}
|
|
688 |
MergeNode merge = (MergeNode) predecessor();
|
|
689 |
if (merge.forwardEndCount() == 1) {
|
|
690 |
// Don't bother.
|
|
691 |
return false;
|
|
692 |
}
|
|
693 |
if (merge.usages().count() != 1 || merge.phis().count() != 1) {
|
|
694 |
return false;
|
|
695 |
}
|
|
696 |
if (merge.stateAfter() != null) {
|
|
697 |
/* We'll get the chance to simplify this after frame state assignment. */
|
|
698 |
return false;
|
|
699 |
}
|
|
700 |
PhiNode phi = merge.phis().first();
|
|
701 |
if (phi.usages().count() != 1) {
|
|
702 |
/*
|
|
703 |
* For simplicity the below code assumes assumes the phi goes dead at the end so skip
|
|
704 |
* this case.
|
|
705 |
*/
|
|
706 |
return false;
|
|
707 |
}
|
|
708 |
|
|
709 |
/*
|
|
710 |
* Check that the condition uses the phi and that there is only one user of the condition
|
|
711 |
* expression.
|
|
712 |
*/
|
|
713 |
if (!conditionUses(condition(), phi)) {
|
|
714 |
return false;
|
|
715 |
}
|
|
716 |
|
|
717 |
/*
|
|
718 |
* We could additionally filter for the case that at least some of the Phi inputs or one of
|
|
719 |
* the condition inputs are constants but there are cases where a non-constant is
|
|
720 |
* simplifiable, usually where the stamp allows the question to be answered.
|
|
721 |
*/
|
|
722 |
|
|
723 |
/* Each successor of the if gets a new merge if needed. */
|
|
724 |
MergeNode trueMerge = null;
|
|
725 |
MergeNode falseMerge = null;
|
|
726 |
assert merge.stateAfter() == null;
|
|
727 |
|
|
728 |
for (EndNode end : merge.forwardEnds().snapshot()) {
|
|
729 |
Node value = phi.valueAt(end);
|
|
730 |
LogicNode result = computeCondition(tool, condition, phi, value);
|
|
731 |
if (result instanceof LogicConstantNode) {
|
|
732 |
merge.removeEnd(end);
|
|
733 |
if (((LogicConstantNode) result).getValue()) {
|
|
734 |
if (trueMerge == null) {
|
|
735 |
trueMerge = insertMerge(trueSuccessor());
|
|
736 |
}
|
|
737 |
trueMerge.addForwardEnd(end);
|
|
738 |
} else {
|
|
739 |
if (falseMerge == null) {
|
|
740 |
falseMerge = insertMerge(falseSuccessor());
|
|
741 |
}
|
|
742 |
falseMerge.addForwardEnd(end);
|
|
743 |
}
|
|
744 |
} else if (result != condition) {
|
|
745 |
// Build a new IfNode using the new condition
|
|
746 |
BeginNode trueBegin = graph().add(new BeginNode());
|
|
747 |
BeginNode falseBegin = graph().add(new BeginNode());
|
|
748 |
|
|
749 |
if (result.graph() == null) {
|
|
750 |
result = graph().addOrUniqueWithInputs(result);
|
|
751 |
}
|
|
752 |
IfNode newIfNode = graph().add(new IfNode(result, trueBegin, falseBegin, trueSuccessorProbability));
|
|
753 |
merge.removeEnd(end);
|
|
754 |
((FixedWithNextNode) end.predecessor()).setNext(newIfNode);
|
|
755 |
|
|
756 |
if (trueMerge == null) {
|
|
757 |
trueMerge = insertMerge(trueSuccessor());
|
|
758 |
}
|
|
759 |
trueBegin.setNext(graph().add(new EndNode()));
|
|
760 |
trueMerge.addForwardEnd((EndNode) trueBegin.next());
|
|
761 |
|
|
762 |
if (falseMerge == null) {
|
|
763 |
falseMerge = insertMerge(falseSuccessor());
|
|
764 |
}
|
|
765 |
falseBegin.setNext(graph().add(new EndNode()));
|
|
766 |
falseMerge.addForwardEnd((EndNode) falseBegin.next());
|
|
767 |
|
|
768 |
end.safeDelete();
|
|
769 |
}
|
|
770 |
}
|
46344
|
771 |
|
43972
|
772 |
transferProxies(trueSuccessor(), trueMerge);
|
|
773 |
transferProxies(falseSuccessor(), falseMerge);
|
|
774 |
|
|
775 |
cleanupMerge(tool, merge);
|
|
776 |
cleanupMerge(tool, trueMerge);
|
|
777 |
cleanupMerge(tool, falseMerge);
|
|
778 |
|
|
779 |
return true;
|
|
780 |
}
|
|
781 |
|
|
782 |
/**
|
|
783 |
* @param condition
|
|
784 |
* @param phi
|
|
785 |
* @return true if the passed in {@code condition} uses {@code phi} and the condition is only
|
|
786 |
* used once. Since the phi will go dead the condition using it will also have to be
|
|
787 |
* dead after the optimization.
|
|
788 |
*/
|
|
789 |
private static boolean conditionUses(LogicNode condition, PhiNode phi) {
|
|
790 |
if (condition.usages().count() != 1) {
|
|
791 |
return false;
|
|
792 |
}
|
|
793 |
if (condition instanceof ShortCircuitOrNode) {
|
|
794 |
if (condition.graph().getGuardsStage().areDeoptsFixed()) {
|
|
795 |
/*
|
|
796 |
* It can be unsafe to simplify a ShortCircuitOr before deopts are fixed because
|
|
797 |
* conversion to guards assumes that all the required conditions are being tested.
|
|
798 |
* Simplfying the condition based on context before this happens may lose a
|
|
799 |
* condition.
|
|
800 |
*/
|
|
801 |
ShortCircuitOrNode orNode = (ShortCircuitOrNode) condition;
|
|
802 |
return (conditionUses(orNode.x, phi) || conditionUses(orNode.y, phi));
|
|
803 |
}
|
|
804 |
} else if (condition instanceof Canonicalizable.Unary<?>) {
|
|
805 |
Canonicalizable.Unary<?> unary = (Canonicalizable.Unary<?>) condition;
|
|
806 |
return unary.getValue() == phi;
|
|
807 |
} else if (condition instanceof Canonicalizable.Binary<?>) {
|
|
808 |
Canonicalizable.Binary<?> binary = (Canonicalizable.Binary<?>) condition;
|
|
809 |
return binary.getX() == phi || binary.getY() == phi;
|
|
810 |
}
|
|
811 |
return false;
|
|
812 |
}
|
|
813 |
|
|
814 |
/**
|
|
815 |
* Canonicalize {@code} condition using {@code value} in place of {@code phi}.
|
|
816 |
*
|
|
817 |
* @param tool
|
|
818 |
* @param condition
|
|
819 |
* @param phi
|
|
820 |
* @param value
|
|
821 |
* @return an improved LogicNode or the original condition
|
|
822 |
*/
|
|
823 |
@SuppressWarnings("unchecked")
|
|
824 |
private static LogicNode computeCondition(SimplifierTool tool, LogicNode condition, PhiNode phi, Node value) {
|
|
825 |
if (condition instanceof ShortCircuitOrNode) {
|
46344
|
826 |
if (condition.graph().getGuardsStage().areDeoptsFixed() && condition.graph().allowShortCircuitOr()) {
|
43972
|
827 |
ShortCircuitOrNode orNode = (ShortCircuitOrNode) condition;
|
|
828 |
LogicNode resultX = computeCondition(tool, orNode.x, phi, value);
|
|
829 |
LogicNode resultY = computeCondition(tool, orNode.y, phi, value);
|
|
830 |
if (resultX != orNode.x || resultY != orNode.y) {
|
|
831 |
LogicNode result = orNode.canonical(tool, resultX, resultY);
|
|
832 |
if (result != orNode) {
|
|
833 |
return result;
|
|
834 |
}
|
|
835 |
/*
|
|
836 |
* Create a new node to carry the optimized inputs.
|
|
837 |
*/
|
|
838 |
ShortCircuitOrNode newOr = new ShortCircuitOrNode(resultX, orNode.xNegated, resultY,
|
|
839 |
orNode.yNegated, orNode.getShortCircuitProbability());
|
|
840 |
return newOr.canonical(tool);
|
|
841 |
}
|
|
842 |
return orNode;
|
|
843 |
}
|
|
844 |
} else if (condition instanceof Canonicalizable.Binary<?>) {
|
|
845 |
Canonicalizable.Binary<Node> compare = (Canonicalizable.Binary<Node>) condition;
|
|
846 |
if (compare.getX() == phi) {
|
|
847 |
return (LogicNode) compare.canonical(tool, value, compare.getY());
|
|
848 |
} else if (compare.getY() == phi) {
|
|
849 |
return (LogicNode) compare.canonical(tool, compare.getX(), value);
|
|
850 |
}
|
|
851 |
} else if (condition instanceof Canonicalizable.Unary<?>) {
|
|
852 |
Canonicalizable.Unary<Node> compare = (Canonicalizable.Unary<Node>) condition;
|
|
853 |
if (compare.getValue() == phi) {
|
|
854 |
return (LogicNode) compare.canonical(tool, value);
|
|
855 |
}
|
|
856 |
}
|
|
857 |
if (condition instanceof Canonicalizable) {
|
|
858 |
return (LogicNode) ((Canonicalizable) condition).canonical(tool);
|
|
859 |
}
|
|
860 |
return condition;
|
|
861 |
}
|
|
862 |
|
|
863 |
private static void transferProxies(AbstractBeginNode successor, MergeNode falseMerge) {
|
|
864 |
if (successor instanceof LoopExitNode && falseMerge != null) {
|
|
865 |
LoopExitNode loopExitNode = (LoopExitNode) successor;
|
|
866 |
for (ProxyNode proxy : loopExitNode.proxies().snapshot()) {
|
|
867 |
proxy.replaceFirstInput(successor, falseMerge);
|
|
868 |
}
|
|
869 |
}
|
|
870 |
}
|
|
871 |
|
|
872 |
private void cleanupMerge(SimplifierTool tool, MergeNode merge) {
|
|
873 |
if (merge != null && merge.isAlive()) {
|
|
874 |
if (merge.forwardEndCount() == 0) {
|
|
875 |
GraphUtil.killCFG(merge, tool);
|
|
876 |
} else if (merge.forwardEndCount() == 1) {
|
|
877 |
graph().reduceTrivialMerge(merge);
|
|
878 |
}
|
|
879 |
}
|
|
880 |
}
|
|
881 |
|
|
882 |
private MergeNode insertMerge(AbstractBeginNode begin) {
|
|
883 |
MergeNode merge = graph().add(new MergeNode());
|
|
884 |
if (!begin.anchored().isEmpty()) {
|
|
885 |
Object before = null;
|
|
886 |
before = begin.anchored().snapshot();
|
|
887 |
begin.replaceAtUsages(InputType.Guard, merge);
|
|
888 |
begin.replaceAtUsages(InputType.Anchor, merge);
|
|
889 |
assert begin.anchored().isEmpty() : before + " " + begin.anchored().snapshot();
|
|
890 |
}
|
|
891 |
|
|
892 |
AbstractBeginNode theBegin = begin;
|
|
893 |
if (begin instanceof LoopExitNode) {
|
|
894 |
// Insert an extra begin to make it easier.
|
|
895 |
theBegin = graph().add(new BeginNode());
|
|
896 |
begin.replaceAtPredecessor(theBegin);
|
|
897 |
theBegin.setNext(begin);
|
|
898 |
}
|
|
899 |
FixedNode next = theBegin.next();
|
|
900 |
next.replaceAtPredecessor(merge);
|
|
901 |
theBegin.setNext(graph().add(new EndNode()));
|
|
902 |
merge.addForwardEnd((EndNode) theBegin.next());
|
|
903 |
merge.setNext(next);
|
|
904 |
return merge;
|
|
905 |
}
|
|
906 |
|
|
907 |
/**
|
|
908 |
* Tries to connect code that initializes a variable directly with the successors of an if
|
|
909 |
* construct that switches on the variable. For example, the pseudo code below:
|
|
910 |
*
|
|
911 |
* <pre>
|
|
912 |
* contains(list, e, yes, no) {
|
|
913 |
* if (list == null || e == null) {
|
|
914 |
* condition = false;
|
|
915 |
* } else {
|
|
916 |
* condition = false;
|
|
917 |
* for (i in list) {
|
|
918 |
* if (i.equals(e)) {
|
|
919 |
* condition = true;
|
|
920 |
* break;
|
|
921 |
* }
|
|
922 |
* }
|
|
923 |
* }
|
|
924 |
* if (condition) {
|
|
925 |
* return yes;
|
|
926 |
* } else {
|
|
927 |
* return no;
|
|
928 |
* }
|
|
929 |
* }
|
|
930 |
* </pre>
|
|
931 |
*
|
|
932 |
* will be transformed into:
|
|
933 |
*
|
|
934 |
* <pre>
|
|
935 |
* contains(list, e, yes, no) {
|
|
936 |
* if (list == null || e == null) {
|
|
937 |
* return no;
|
|
938 |
* } else {
|
|
939 |
* condition = false;
|
|
940 |
* for (i in list) {
|
|
941 |
* if (i.equals(e)) {
|
|
942 |
* return yes;
|
|
943 |
* }
|
|
944 |
* }
|
|
945 |
* return no;
|
|
946 |
* }
|
|
947 |
* }
|
|
948 |
* </pre>
|
|
949 |
*
|
|
950 |
* @return true if a transformation was made, false otherwise
|
|
951 |
*/
|
|
952 |
private boolean removeIntermediateMaterialization(SimplifierTool tool) {
|
|
953 |
if (!(predecessor() instanceof AbstractMergeNode) || predecessor() instanceof LoopBeginNode) {
|
|
954 |
return false;
|
|
955 |
}
|
|
956 |
AbstractMergeNode merge = (AbstractMergeNode) predecessor();
|
|
957 |
|
|
958 |
if (!(condition() instanceof CompareNode)) {
|
|
959 |
return false;
|
|
960 |
}
|
|
961 |
|
|
962 |
CompareNode compare = (CompareNode) condition();
|
|
963 |
if (compare.getUsageCount() != 1) {
|
|
964 |
return false;
|
|
965 |
}
|
|
966 |
|
|
967 |
// Only consider merges with a single usage that is both a phi and an operand of the
|
|
968 |
// comparison
|
|
969 |
NodeIterable<Node> mergeUsages = merge.usages();
|
|
970 |
if (mergeUsages.count() != 1) {
|
|
971 |
return false;
|
|
972 |
}
|
|
973 |
Node singleUsage = mergeUsages.first();
|
|
974 |
if (!(singleUsage instanceof ValuePhiNode) || (singleUsage != compare.getX() && singleUsage != compare.getY())) {
|
|
975 |
return false;
|
|
976 |
}
|
|
977 |
|
|
978 |
// Ensure phi is used by at most the comparison and the merge's frame state (if any)
|
|
979 |
ValuePhiNode phi = (ValuePhiNode) singleUsage;
|
|
980 |
NodeIterable<Node> phiUsages = phi.usages();
|
|
981 |
if (phiUsages.count() > 2) {
|
|
982 |
return false;
|
|
983 |
}
|
|
984 |
for (Node usage : phiUsages) {
|
|
985 |
if (usage != compare && usage != merge.stateAfter()) {
|
|
986 |
return false;
|
|
987 |
}
|
|
988 |
}
|
|
989 |
|
|
990 |
List<EndNode> mergePredecessors = merge.cfgPredecessors().snapshot();
|
|
991 |
assert phi.valueCount() == merge.forwardEndCount();
|
|
992 |
|
|
993 |
Constant[] xs = constantValues(compare.getX(), merge, false);
|
|
994 |
Constant[] ys = constantValues(compare.getY(), merge, false);
|
|
995 |
if (xs == null || ys == null) {
|
|
996 |
return false;
|
|
997 |
}
|
|
998 |
|
|
999 |
// Sanity check that both ends are not followed by a merge without frame state.
|
|
1000 |
if (!checkFrameState(trueSuccessor()) && !checkFrameState(falseSuccessor())) {
|
|
1001 |
return false;
|
|
1002 |
}
|
|
1003 |
|
|
1004 |
List<EndNode> falseEnds = new ArrayList<>(mergePredecessors.size());
|
|
1005 |
List<EndNode> trueEnds = new ArrayList<>(mergePredecessors.size());
|
46344
|
1006 |
EconomicMap<AbstractEndNode, ValueNode> phiValues = EconomicMap.create(Equivalence.IDENTITY, mergePredecessors.size());
|
43972
|
1007 |
|
|
1008 |
AbstractBeginNode oldFalseSuccessor = falseSuccessor();
|
|
1009 |
AbstractBeginNode oldTrueSuccessor = trueSuccessor();
|
|
1010 |
|
|
1011 |
setFalseSuccessor(null);
|
|
1012 |
setTrueSuccessor(null);
|
|
1013 |
|
|
1014 |
Iterator<EndNode> ends = mergePredecessors.iterator();
|
|
1015 |
for (int i = 0; i < xs.length; i++) {
|
|
1016 |
EndNode end = ends.next();
|
|
1017 |
phiValues.put(end, phi.valueAt(end));
|
|
1018 |
if (compare.condition().foldCondition(xs[i], ys[i], tool.getConstantReflection(), compare.unorderedIsTrue())) {
|
|
1019 |
trueEnds.add(end);
|
|
1020 |
} else {
|
|
1021 |
falseEnds.add(end);
|
|
1022 |
}
|
|
1023 |
}
|
|
1024 |
assert !ends.hasNext();
|
|
1025 |
assert falseEnds.size() + trueEnds.size() == xs.length;
|
|
1026 |
|
|
1027 |
connectEnds(falseEnds, phiValues, oldFalseSuccessor, merge, tool);
|
|
1028 |
connectEnds(trueEnds, phiValues, oldTrueSuccessor, merge, tool);
|
|
1029 |
|
|
1030 |
if (this.trueSuccessorProbability == 0.0) {
|
|
1031 |
for (AbstractEndNode endNode : trueEnds) {
|
|
1032 |
propagateZeroProbability(endNode);
|
|
1033 |
}
|
|
1034 |
}
|
|
1035 |
|
|
1036 |
if (this.trueSuccessorProbability == 1.0) {
|
|
1037 |
for (AbstractEndNode endNode : falseEnds) {
|
|
1038 |
propagateZeroProbability(endNode);
|
|
1039 |
}
|
|
1040 |
}
|
|
1041 |
|
|
1042 |
/*
|
|
1043 |
* Remove obsolete ends only after processing all ends, otherwise oldTrueSuccessor or
|
|
1044 |
* oldFalseSuccessor might have been removed if it is a LoopExitNode.
|
|
1045 |
*/
|
|
1046 |
if (falseEnds.isEmpty()) {
|
|
1047 |
GraphUtil.killCFG(oldFalseSuccessor);
|
|
1048 |
}
|
|
1049 |
if (trueEnds.isEmpty()) {
|
|
1050 |
GraphUtil.killCFG(oldTrueSuccessor);
|
|
1051 |
}
|
|
1052 |
GraphUtil.killCFG(merge);
|
|
1053 |
|
|
1054 |
assert !merge.isAlive() : merge;
|
|
1055 |
assert !phi.isAlive() : phi;
|
|
1056 |
assert !compare.isAlive() : compare;
|
|
1057 |
assert !this.isAlive() : this;
|
|
1058 |
|
|
1059 |
return true;
|
|
1060 |
}
|
|
1061 |
|
|
1062 |
private void propagateZeroProbability(FixedNode startNode) {
|
|
1063 |
Node prev = null;
|
|
1064 |
for (FixedNode node : GraphUtil.predecessorIterable(startNode)) {
|
|
1065 |
if (node instanceof IfNode) {
|
|
1066 |
IfNode ifNode = (IfNode) node;
|
|
1067 |
if (ifNode.trueSuccessor() == prev) {
|
|
1068 |
if (ifNode.trueSuccessorProbability == 0.0) {
|
|
1069 |
return;
|
|
1070 |
} else if (ifNode.trueSuccessorProbability == 1.0) {
|
|
1071 |
continue;
|
|
1072 |
} else {
|
|
1073 |
ifNode.setTrueSuccessorProbability(0.0);
|
|
1074 |
return;
|
|
1075 |
}
|
|
1076 |
} else if (ifNode.falseSuccessor() == prev) {
|
|
1077 |
if (ifNode.trueSuccessorProbability == 1.0) {
|
|
1078 |
return;
|
|
1079 |
} else if (ifNode.trueSuccessorProbability == 0.0) {
|
|
1080 |
continue;
|
|
1081 |
} else {
|
|
1082 |
ifNode.setTrueSuccessorProbability(1.0);
|
|
1083 |
return;
|
|
1084 |
}
|
|
1085 |
} else {
|
|
1086 |
throw new GraalError("Illegal state");
|
|
1087 |
}
|
|
1088 |
} else if (node instanceof AbstractMergeNode && !(node instanceof LoopBeginNode)) {
|
|
1089 |
for (AbstractEndNode endNode : ((AbstractMergeNode) node).cfgPredecessors()) {
|
|
1090 |
propagateZeroProbability(endNode);
|
|
1091 |
}
|
|
1092 |
return;
|
|
1093 |
}
|
|
1094 |
prev = node;
|
|
1095 |
}
|
|
1096 |
}
|
|
1097 |
|
|
1098 |
private static boolean checkFrameState(FixedNode start) {
|
|
1099 |
FixedNode node = start;
|
|
1100 |
while (true) {
|
|
1101 |
if (node instanceof AbstractMergeNode) {
|
|
1102 |
AbstractMergeNode mergeNode = (AbstractMergeNode) node;
|
|
1103 |
if (mergeNode.stateAfter() == null) {
|
|
1104 |
return false;
|
|
1105 |
} else {
|
|
1106 |
return true;
|
|
1107 |
}
|
|
1108 |
} else if (node instanceof StateSplit) {
|
|
1109 |
StateSplit stateSplitNode = (StateSplit) node;
|
|
1110 |
if (stateSplitNode.stateAfter() != null) {
|
|
1111 |
return true;
|
|
1112 |
}
|
|
1113 |
}
|
|
1114 |
|
|
1115 |
if (node instanceof ControlSplitNode) {
|
|
1116 |
ControlSplitNode controlSplitNode = (ControlSplitNode) node;
|
|
1117 |
for (Node succ : controlSplitNode.cfgSuccessors()) {
|
|
1118 |
if (checkFrameState((FixedNode) succ)) {
|
|
1119 |
return true;
|
|
1120 |
}
|
|
1121 |
}
|
|
1122 |
return false;
|
|
1123 |
} else if (node instanceof FixedWithNextNode) {
|
|
1124 |
FixedWithNextNode fixedWithNextNode = (FixedWithNextNode) node;
|
|
1125 |
node = fixedWithNextNode.next();
|
|
1126 |
} else if (node instanceof AbstractEndNode) {
|
|
1127 |
AbstractEndNode endNode = (AbstractEndNode) node;
|
|
1128 |
node = endNode.merge();
|
|
1129 |
} else if (node instanceof ControlSinkNode) {
|
|
1130 |
return true;
|
|
1131 |
} else {
|
|
1132 |
return false;
|
|
1133 |
}
|
|
1134 |
}
|
|
1135 |
}
|
|
1136 |
|
|
1137 |
/**
|
|
1138 |
* Connects a set of ends to a given successor, inserting a merge node if there is more than one
|
|
1139 |
* end. If {@code ends} is not empty, then {@code successor} is added to {@code tool}'s
|
|
1140 |
* {@linkplain SimplifierTool#addToWorkList(org.graalvm.compiler.graph.Node) work list}.
|
|
1141 |
*
|
|
1142 |
* @param oldMerge the merge being removed
|
|
1143 |
* @param phiValues the values of the phi at the merge, keyed by the merge ends
|
|
1144 |
*/
|
46344
|
1145 |
private void connectEnds(List<EndNode> ends, EconomicMap<AbstractEndNode, ValueNode> phiValues, AbstractBeginNode successor, AbstractMergeNode oldMerge, SimplifierTool tool) {
|
43972
|
1146 |
if (!ends.isEmpty()) {
|
|
1147 |
if (ends.size() == 1) {
|
|
1148 |
AbstractEndNode end = ends.get(0);
|
|
1149 |
((FixedWithNextNode) end.predecessor()).setNext(successor);
|
|
1150 |
oldMerge.removeEnd(end);
|
|
1151 |
GraphUtil.killCFG(end);
|
|
1152 |
} else {
|
|
1153 |
// Need a new phi in case the frame state is used by more than the merge being
|
|
1154 |
// removed
|
|
1155 |
AbstractMergeNode newMerge = graph().add(new MergeNode());
|
|
1156 |
PhiNode oldPhi = (PhiNode) oldMerge.usages().first();
|
|
1157 |
PhiNode newPhi = graph().addWithoutUnique(new ValuePhiNode(oldPhi.stamp(), newMerge));
|
|
1158 |
|
|
1159 |
for (EndNode end : ends) {
|
|
1160 |
newPhi.addInput(phiValues.get(end));
|
|
1161 |
newMerge.addForwardEnd(end);
|
|
1162 |
}
|
|
1163 |
|
|
1164 |
FrameState stateAfter = oldMerge.stateAfter();
|
|
1165 |
if (stateAfter != null) {
|
|
1166 |
stateAfter = stateAfter.duplicate();
|
|
1167 |
stateAfter.replaceFirstInput(oldPhi, newPhi);
|
|
1168 |
newMerge.setStateAfter(stateAfter);
|
|
1169 |
}
|
|
1170 |
|
|
1171 |
newMerge.setNext(successor);
|
|
1172 |
}
|
|
1173 |
tool.addToWorkList(successor);
|
|
1174 |
}
|
|
1175 |
}
|
|
1176 |
|
|
1177 |
/**
|
|
1178 |
* Gets an array of constants derived from a node that is either a {@link ConstantNode} or a
|
|
1179 |
* {@link PhiNode} whose input values are all constants. The length of the returned array is
|
|
1180 |
* equal to the number of ends terminating in a given merge node.
|
|
1181 |
*
|
|
1182 |
* @return null if {@code node} is neither a {@link ConstantNode} nor a {@link PhiNode} whose
|
|
1183 |
* input values are all constants
|
|
1184 |
*/
|
|
1185 |
public static Constant[] constantValues(ValueNode node, AbstractMergeNode merge, boolean allowNull) {
|
|
1186 |
if (node.isConstant()) {
|
|
1187 |
Constant[] result = new Constant[merge.forwardEndCount()];
|
|
1188 |
Arrays.fill(result, node.asConstant());
|
|
1189 |
return result;
|
|
1190 |
}
|
|
1191 |
|
|
1192 |
if (node instanceof PhiNode) {
|
|
1193 |
PhiNode phi = (PhiNode) node;
|
|
1194 |
if (phi.merge() == merge && phi instanceof ValuePhiNode && phi.valueCount() == merge.forwardEndCount()) {
|
|
1195 |
Constant[] result = new Constant[merge.forwardEndCount()];
|
|
1196 |
int i = 0;
|
|
1197 |
for (ValueNode n : phi.values()) {
|
|
1198 |
if (!allowNull && !n.isConstant()) {
|
|
1199 |
return null;
|
|
1200 |
}
|
|
1201 |
result[i++] = n.asConstant();
|
|
1202 |
}
|
|
1203 |
return result;
|
|
1204 |
}
|
|
1205 |
}
|
|
1206 |
|
|
1207 |
return null;
|
|
1208 |
}
|
|
1209 |
|
|
1210 |
@Override
|
|
1211 |
public AbstractBeginNode getPrimarySuccessor() {
|
|
1212 |
return this.trueSuccessor();
|
|
1213 |
}
|
|
1214 |
|
|
1215 |
public AbstractBeginNode getSuccessor(boolean result) {
|
|
1216 |
return result ? this.trueSuccessor() : this.falseSuccessor();
|
|
1217 |
}
|
46344
|
1218 |
|
|
1219 |
@Override
|
|
1220 |
public boolean setProbability(AbstractBeginNode successor, double value) {
|
|
1221 |
if (successor == this.trueSuccessor()) {
|
|
1222 |
this.setTrueSuccessorProbability(value);
|
|
1223 |
return true;
|
|
1224 |
} else if (successor == this.falseSuccessor()) {
|
|
1225 |
this.setTrueSuccessorProbability(1.0 - value);
|
|
1226 |
return true;
|
|
1227 |
}
|
|
1228 |
return false;
|
|
1229 |
}
|
|
1230 |
|
|
1231 |
@Override
|
|
1232 |
public int getSuccessorCount() {
|
|
1233 |
return 2;
|
|
1234 |
}
|
43972
|
1235 |
}
|