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/*
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* Copyright (c) 2012, 2019, 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.loop;
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import java.util.ArrayList;
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import java.util.LinkedList;
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import java.util.List;
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import jdk.internal.vm.compiler.collections.EconomicMap;
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import jdk.internal.vm.compiler.collections.Equivalence;
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import org.graalvm.compiler.core.common.type.IntegerStamp;
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import org.graalvm.compiler.debug.DebugCloseable;
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import org.graalvm.compiler.debug.DebugContext;
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import org.graalvm.compiler.debug.GraalError;
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import org.graalvm.compiler.graph.Graph.DuplicationReplacement;
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import org.graalvm.compiler.graph.Node;
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import org.graalvm.compiler.graph.NodeBitMap;
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import org.graalvm.compiler.graph.iterators.NodeIterable;
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import org.graalvm.compiler.nodes.AbstractBeginNode;
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import org.graalvm.compiler.nodes.AbstractEndNode;
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import org.graalvm.compiler.nodes.AbstractMergeNode;
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import org.graalvm.compiler.nodes.BeginNode;
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import org.graalvm.compiler.nodes.ConstantNode;
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import org.graalvm.compiler.nodes.EndNode;
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import org.graalvm.compiler.nodes.FixedNode;
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import org.graalvm.compiler.nodes.FixedWithNextNode;
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import org.graalvm.compiler.nodes.FrameState;
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import org.graalvm.compiler.nodes.GuardPhiNode;
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import org.graalvm.compiler.nodes.IfNode;
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import org.graalvm.compiler.nodes.LogicNode;
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import org.graalvm.compiler.nodes.LoopBeginNode;
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import org.graalvm.compiler.nodes.LoopEndNode;
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import org.graalvm.compiler.nodes.LoopExitNode;
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import org.graalvm.compiler.nodes.MergeNode;
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import org.graalvm.compiler.nodes.NodeView;
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import org.graalvm.compiler.nodes.PhiNode;
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import org.graalvm.compiler.nodes.ProxyNode;
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import org.graalvm.compiler.nodes.SafepointNode;
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import org.graalvm.compiler.nodes.StateSplit;
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import org.graalvm.compiler.nodes.StructuredGraph;
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import org.graalvm.compiler.nodes.ValueNode;
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import org.graalvm.compiler.nodes.ValuePhiNode;
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import org.graalvm.compiler.nodes.VirtualState.NodeClosure;
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import org.graalvm.compiler.nodes.calc.AddNode;
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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.SubNode;
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import org.graalvm.compiler.nodes.extended.OpaqueNode;
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import org.graalvm.compiler.nodes.memory.MemoryPhiNode;
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import org.graalvm.compiler.nodes.util.GraphUtil;
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import org.graalvm.compiler.nodes.util.IntegerHelper;
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public class LoopFragmentInside extends LoopFragment {
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/**
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* mergedInitializers. When an inside fragment's (loop)ends are merged to create a unique exit
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* point, some phis must be created : they phis together all the back-values of the loop-phis
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* These can then be used to update the loop-phis' forward edge value ('initializer') in the
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* peeling case. In the unrolling case they will be used as the value that replace the loop-phis
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* of the duplicated inside fragment
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*/
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private EconomicMap<PhiNode, ValueNode> mergedInitializers;
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private final DuplicationReplacement dataFixBefore = new DuplicationReplacement() {
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@Override
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public Node replacement(Node oriInput) {
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if (!(oriInput instanceof ValueNode)) {
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return oriInput;
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}
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return prim((ValueNode) oriInput);
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}
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};
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private final DuplicationReplacement dataFixWithinAfter = new DuplicationReplacement() {
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@Override
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public Node replacement(Node oriInput) {
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if (!(oriInput instanceof ValueNode)) {
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return oriInput;
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}
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return primAfter((ValueNode) oriInput);
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}
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};
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public LoopFragmentInside(LoopEx loop) {
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super(loop);
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}
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public LoopFragmentInside(LoopFragmentInside original) {
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super(null, original);
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}
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@Override
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public LoopFragmentInside duplicate() {
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assert !isDuplicate();
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return new LoopFragmentInside(this);
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}
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@Override
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public LoopFragmentInside original() {
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return (LoopFragmentInside) super.original();
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}
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@SuppressWarnings("unused")
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public void appendInside(LoopEx loop) {
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// TODO (gd)
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}
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@Override
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public LoopEx loop() {
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assert !this.isDuplicate();
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return super.loop();
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}
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@Override
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public void insertBefore(LoopEx loop) {
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assert this.isDuplicate() && this.original().loop() == loop;
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patchNodes(dataFixBefore);
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AbstractBeginNode end = mergeEnds();
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mergeEarlyExits();
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original().patchPeeling(this);
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AbstractBeginNode entry = getDuplicatedNode(loop.loopBegin());
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loop.entryPoint().replaceAtPredecessor(entry);
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end.setNext(loop.entryPoint());
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}
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/**
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* Duplicate the body within the loop after the current copy copy of the body, updating the
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* iteration limit to account for the duplication.
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*/
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public void insertWithinAfter(LoopEx loop, EconomicMap<LoopBeginNode, OpaqueNode> opaqueUnrolledStrides) {
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assert isDuplicate() && original().loop() == loop;
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patchNodes(dataFixWithinAfter);
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/*
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* Collect any new back edges values before updating them since they might reference each
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* other.
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*/
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LoopBeginNode mainLoopBegin = loop.loopBegin();
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ArrayList<ValueNode> backedgeValues = new ArrayList<>();
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for (PhiNode mainPhiNode : mainLoopBegin.phis()) {
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ValueNode originalNode = mainPhiNode.valueAt(1);
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ValueNode duplicatedNode = getDuplicatedNode(originalNode);
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if (duplicatedNode == null) {
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if (mainLoopBegin.isPhiAtMerge(originalNode)) {
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duplicatedNode = ((PhiNode) (originalNode)).valueAt(1);
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} else {
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assert originalNode.isConstant() || loop.isOutsideLoop(originalNode) : "Not duplicated node " + originalNode;
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}
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}
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backedgeValues.add(duplicatedNode);
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}
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int index = 0;
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for (PhiNode mainPhiNode : mainLoopBegin.phis()) {
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ValueNode duplicatedNode = backedgeValues.get(index++);
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if (duplicatedNode != null) {
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mainPhiNode.setValueAt(1, duplicatedNode);
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}
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}
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placeNewSegmentAndCleanup(loop);
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// Remove any safepoints from the original copy leaving only the duplicated one
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assert loop.whole().nodes().filter(SafepointNode.class).count() == nodes().filter(SafepointNode.class).count();
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for (SafepointNode safepoint : loop.whole().nodes().filter(SafepointNode.class)) {
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graph().removeFixed(safepoint);
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}
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StructuredGraph graph = mainLoopBegin.graph();
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if (opaqueUnrolledStrides != null) {
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OpaqueNode opaque = opaqueUnrolledStrides.get(loop.loopBegin());
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CountedLoopInfo counted = loop.counted();
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ValueNode counterStride = counted.getCounter().strideNode();
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if (opaque == null) {
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opaque = new OpaqueNode(AddNode.add(counterStride, counterStride, NodeView.DEFAULT));
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ValueNode limit = counted.getLimit();
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int bits = ((IntegerStamp) limit.stamp(NodeView.DEFAULT)).getBits();
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ValueNode newLimit = SubNode.create(limit, opaque, NodeView.DEFAULT);
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IntegerHelper helper = counted.getCounterIntegerHelper();
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LogicNode overflowCheck;
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ConstantNode extremum;
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if (counted.getDirection() == InductionVariable.Direction.Up) {
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// limit - counterStride could overflow negatively if limit - min <
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// counterStride
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extremum = ConstantNode.forIntegerBits(bits, helper.minValue());
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overflowCheck = IntegerBelowNode.create(SubNode.create(limit, extremum, NodeView.DEFAULT), opaque, NodeView.DEFAULT);
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} else {
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assert counted.getDirection() == InductionVariable.Direction.Down;
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// limit - counterStride could overflow if max - limit < -counterStride
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// i.e., counterStride < limit - max
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extremum = ConstantNode.forIntegerBits(bits, helper.maxValue());
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overflowCheck = IntegerBelowNode.create(opaque, SubNode.create(limit, extremum, NodeView.DEFAULT), NodeView.DEFAULT);
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}
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newLimit = ConditionalNode.create(overflowCheck, extremum, newLimit, NodeView.DEFAULT);
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CompareNode compareNode = (CompareNode) counted.getLimitTest().condition();
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compareNode.replaceFirstInput(limit, graph.addOrUniqueWithInputs(newLimit));
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opaqueUnrolledStrides.put(loop.loopBegin(), opaque);
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} else {
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assert counted.getCounter().isConstantStride();
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assert Math.addExact(counted.getCounter().constantStride(), counted.getCounter().constantStride()) == counted.getCounter().constantStride() * 2;
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ValueNode previousValue = opaque.getValue();
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opaque.setValue(graph.addOrUniqueWithInputs(AddNode.add(counterStride, previousValue, NodeView.DEFAULT)));
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GraphUtil.tryKillUnused(previousValue);
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}
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}
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mainLoopBegin.setUnrollFactor(mainLoopBegin.getUnrollFactor() * 2);
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mainLoopBegin.setLoopFrequency(mainLoopBegin.loopFrequency() / 2);
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graph.getDebug().dump(DebugContext.DETAILED_LEVEL, graph, "LoopPartialUnroll %s", loop);
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mainLoopBegin.getDebug().dump(DebugContext.VERBOSE_LEVEL, mainLoopBegin.graph(), "After insertWithinAfter %s", mainLoopBegin);
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}
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private void placeNewSegmentAndCleanup(LoopEx loop) {
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CountedLoopInfo mainCounted = loop.counted();
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LoopBeginNode mainLoopBegin = loop.loopBegin();
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// Discard the segment entry and its flow, after if merging it into the loop
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StructuredGraph graph = mainLoopBegin.graph();
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IfNode loopTest = mainCounted.getLimitTest();
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IfNode newSegmentLoopTest = getDuplicatedNode(loopTest);
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// Redirect anchors
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AbstractBeginNode falseSuccessor = newSegmentLoopTest.falseSuccessor();
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for (Node usage : falseSuccessor.anchored().snapshot()) {
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usage.replaceFirstInput(falseSuccessor, loopTest.falseSuccessor());
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}
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AbstractBeginNode trueSuccessor = newSegmentLoopTest.trueSuccessor();
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for (Node usage : trueSuccessor.anchored().snapshot()) {
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usage.replaceFirstInput(trueSuccessor, loopTest.trueSuccessor());
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}
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// remove if test
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graph.removeSplitPropagate(newSegmentLoopTest, loopTest.trueSuccessor() == mainCounted.getBody() ? trueSuccessor : falseSuccessor);
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graph.getDebug().dump(DebugContext.DETAILED_LEVEL, graph, "Before placing segment");
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if (mainCounted.getBody().next() instanceof LoopEndNode) {
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GraphUtil.killCFG(getDuplicatedNode(mainLoopBegin));
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} else {
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AbstractBeginNode newSegmentBegin = getDuplicatedNode(mainLoopBegin);
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FixedNode newSegmentFirstNode = newSegmentBegin.next();
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EndNode newSegmentEnd = getBlockEnd(newSegmentBegin);
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FixedWithNextNode newSegmentLastNode = (FixedWithNextNode) newSegmentEnd.predecessor();
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LoopEndNode loopEndNode = mainLoopBegin.getSingleLoopEnd();
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FixedWithNextNode lastCodeNode = (FixedWithNextNode) loopEndNode.predecessor();
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newSegmentBegin.clearSuccessors();
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lastCodeNode.replaceFirstSuccessor(loopEndNode, newSegmentFirstNode);
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newSegmentLastNode.replaceFirstSuccessor(newSegmentEnd, loopEndNode);
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newSegmentBegin.safeDelete();
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newSegmentEnd.safeDelete();
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}
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graph.getDebug().dump(DebugContext.DETAILED_LEVEL, graph, "After placing segment");
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}
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private static EndNode getBlockEnd(FixedNode node) {
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FixedNode curNode = node;
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while (curNode instanceof FixedWithNextNode) {
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curNode = ((FixedWithNextNode) curNode).next();
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}
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return (EndNode) curNode;
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}
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@Override
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public NodeBitMap nodes() {
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if (nodes == null) {
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LoopFragmentWhole whole = loop().whole();
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whole.nodes(); // init nodes bitmap in whole
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nodes = whole.nodes.copy();
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// remove the phis
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LoopBeginNode loopBegin = loop().loopBegin();
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for (PhiNode phi : loopBegin.phis()) {
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nodes.clear(phi);
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}
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clearStateNodes(loopBegin);
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for (LoopExitNode exit : exits()) {
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clearStateNodes(exit);
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for (ProxyNode proxy : exit.proxies()) {
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nodes.clear(proxy);
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}
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}
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}
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return nodes;
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}
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private void clearStateNodes(StateSplit stateSplit) {
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FrameState loopState = stateSplit.stateAfter();
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if (loopState != null) {
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loopState.applyToVirtual(v -> {
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if (v.usages().filter(n -> nodes.isMarked(n) && n != stateSplit).isEmpty()) {
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nodes.clear(v);
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}
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});
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}
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}
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public NodeIterable<LoopExitNode> exits() {
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return loop().loopBegin().loopExits();
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}
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@Override
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@SuppressWarnings("try")
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protected DuplicationReplacement getDuplicationReplacement() {
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final LoopBeginNode loopBegin = loop().loopBegin();
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final StructuredGraph graph = graph();
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return new DuplicationReplacement() {
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private EconomicMap<Node, Node> seenNode = EconomicMap.create(Equivalence.IDENTITY);
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@Override
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public Node replacement(Node original) {
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try (DebugCloseable position = original.withNodeSourcePosition()) {
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if (original == loopBegin) {
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Node value = seenNode.get(original);
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if (value != null) {
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return value;
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}
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AbstractBeginNode newValue = graph.add(new BeginNode());
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seenNode.put(original, newValue);
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return newValue;
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}
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if (original instanceof LoopExitNode && ((LoopExitNode) original).loopBegin() == loopBegin) {
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Node value = seenNode.get(original);
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if (value != null) {
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return value;
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}
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AbstractBeginNode newValue = graph.add(new BeginNode());
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seenNode.put(original, newValue);
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return newValue;
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}
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if (original instanceof LoopEndNode && ((LoopEndNode) original).loopBegin() == loopBegin) {
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Node value = seenNode.get(original);
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if (value != null) {
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return value;
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}
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EndNode newValue = graph.add(new EndNode());
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seenNode.put(original, newValue);
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return newValue;
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}
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return original;
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43972
|
369 |
}
|
|
370 |
}
|
|
371 |
};
|
|
372 |
}
|
|
373 |
|
|
374 |
@Override
|
46640
|
375 |
protected void beforeDuplication() {
|
|
376 |
// Nothing to do
|
|
377 |
}
|
|
378 |
|
43972
|
379 |
private static PhiNode patchPhi(StructuredGraph graph, PhiNode phi, AbstractMergeNode merge) {
|
|
380 |
PhiNode ret;
|
|
381 |
if (phi instanceof ValuePhiNode) {
|
48190
|
382 |
ret = new ValuePhiNode(phi.stamp(NodeView.DEFAULT), merge);
|
43972
|
383 |
} else if (phi instanceof GuardPhiNode) {
|
|
384 |
ret = new GuardPhiNode(merge);
|
|
385 |
} else if (phi instanceof MemoryPhiNode) {
|
|
386 |
ret = new MemoryPhiNode(merge, ((MemoryPhiNode) phi).getLocationIdentity());
|
|
387 |
} else {
|
|
388 |
throw GraalError.shouldNotReachHere();
|
|
389 |
}
|
|
390 |
return graph.addWithoutUnique(ret);
|
|
391 |
}
|
|
392 |
|
|
393 |
private void patchPeeling(LoopFragmentInside peel) {
|
|
394 |
LoopBeginNode loopBegin = loop().loopBegin();
|
|
395 |
StructuredGraph graph = loopBegin.graph();
|
|
396 |
List<PhiNode> newPhis = new LinkedList<>();
|
|
397 |
|
|
398 |
NodeBitMap usagesToPatch = nodes.copy();
|
|
399 |
for (LoopExitNode exit : exits()) {
|
|
400 |
markStateNodes(exit, usagesToPatch);
|
|
401 |
for (ProxyNode proxy : exit.proxies()) {
|
|
402 |
usagesToPatch.markAndGrow(proxy);
|
|
403 |
}
|
|
404 |
}
|
|
405 |
markStateNodes(loopBegin, usagesToPatch);
|
|
406 |
|
|
407 |
List<PhiNode> oldPhis = loopBegin.phis().snapshot();
|
|
408 |
for (PhiNode phi : oldPhis) {
|
|
409 |
if (phi.hasNoUsages()) {
|
|
410 |
continue;
|
|
411 |
}
|
|
412 |
ValueNode first;
|
|
413 |
if (loopBegin.loopEnds().count() == 1) {
|
|
414 |
ValueNode b = phi.valueAt(loopBegin.loopEnds().first()); // back edge value
|
|
415 |
first = peel.prim(b); // corresponding value in the peel
|
|
416 |
} else {
|
|
417 |
first = peel.mergedInitializers.get(phi);
|
|
418 |
}
|
|
419 |
// create a new phi (we don't patch the old one since some usages of the old one may
|
|
420 |
// still be valid)
|
|
421 |
PhiNode newPhi = patchPhi(graph, phi, loopBegin);
|
|
422 |
newPhi.addInput(first);
|
|
423 |
for (LoopEndNode end : loopBegin.orderedLoopEnds()) {
|
|
424 |
newPhi.addInput(phi.valueAt(end));
|
|
425 |
}
|
|
426 |
peel.putDuplicatedNode(phi, newPhi);
|
|
427 |
newPhis.add(newPhi);
|
|
428 |
for (Node usage : phi.usages().snapshot()) {
|
|
429 |
// patch only usages that should use the new phi ie usages that were peeled
|
|
430 |
if (usagesToPatch.isMarkedAndGrow(usage)) {
|
|
431 |
usage.replaceFirstInput(phi, newPhi);
|
|
432 |
}
|
|
433 |
}
|
|
434 |
}
|
|
435 |
// check new phis to see if they have as input some old phis, replace those inputs with the
|
|
436 |
// new corresponding phis
|
|
437 |
for (PhiNode phi : newPhis) {
|
|
438 |
for (int i = 0; i < phi.valueCount(); i++) {
|
|
439 |
ValueNode v = phi.valueAt(i);
|
|
440 |
if (loopBegin.isPhiAtMerge(v)) {
|
|
441 |
PhiNode newV = peel.getDuplicatedNode((ValuePhiNode) v);
|
|
442 |
if (newV != null) {
|
|
443 |
phi.setValueAt(i, newV);
|
|
444 |
}
|
|
445 |
}
|
|
446 |
}
|
|
447 |
}
|
|
448 |
|
|
449 |
boolean progress = true;
|
|
450 |
while (progress) {
|
|
451 |
progress = false;
|
|
452 |
int i = 0;
|
|
453 |
outer: while (i < oldPhis.size()) {
|
|
454 |
PhiNode oldPhi = oldPhis.get(i);
|
|
455 |
for (Node usage : oldPhi.usages()) {
|
|
456 |
if (usage instanceof PhiNode && oldPhis.contains(usage)) {
|
|
457 |
// Do not mark.
|
|
458 |
} else {
|
|
459 |
// Mark alive by removing from delete set.
|
|
460 |
oldPhis.remove(i);
|
|
461 |
progress = true;
|
|
462 |
continue outer;
|
|
463 |
}
|
|
464 |
}
|
|
465 |
i++;
|
|
466 |
}
|
|
467 |
}
|
|
468 |
|
|
469 |
for (PhiNode deadPhi : oldPhis) {
|
|
470 |
deadPhi.clearInputs();
|
|
471 |
}
|
|
472 |
|
|
473 |
for (PhiNode deadPhi : oldPhis) {
|
|
474 |
if (deadPhi.isAlive()) {
|
|
475 |
GraphUtil.killWithUnusedFloatingInputs(deadPhi);
|
|
476 |
}
|
|
477 |
}
|
|
478 |
}
|
|
479 |
|
|
480 |
private static void markStateNodes(StateSplit stateSplit, NodeBitMap marks) {
|
|
481 |
FrameState exitState = stateSplit.stateAfter();
|
|
482 |
if (exitState != null) {
|
|
483 |
exitState.applyToVirtual(v -> marks.markAndGrow(v));
|
|
484 |
}
|
|
485 |
}
|
|
486 |
|
|
487 |
/**
|
|
488 |
* Gets the corresponding value in this fragment.
|
|
489 |
*
|
|
490 |
* @param b original value
|
|
491 |
* @return corresponding value in the peel
|
|
492 |
*/
|
|
493 |
@Override
|
|
494 |
protected ValueNode prim(ValueNode b) {
|
|
495 |
assert isDuplicate();
|
|
496 |
LoopBeginNode loopBegin = original().loop().loopBegin();
|
|
497 |
if (loopBegin.isPhiAtMerge(b)) {
|
|
498 |
PhiNode phi = (PhiNode) b;
|
|
499 |
return phi.valueAt(loopBegin.forwardEnd());
|
|
500 |
} else if (nodesReady) {
|
|
501 |
ValueNode v = getDuplicatedNode(b);
|
|
502 |
if (v == null) {
|
|
503 |
return b;
|
|
504 |
}
|
|
505 |
return v;
|
|
506 |
} else {
|
|
507 |
return b;
|
|
508 |
}
|
|
509 |
}
|
|
510 |
|
46640
|
511 |
protected ValueNode primAfter(ValueNode b) {
|
|
512 |
assert isDuplicate();
|
|
513 |
LoopBeginNode loopBegin = original().loop().loopBegin();
|
|
514 |
if (loopBegin.isPhiAtMerge(b)) {
|
|
515 |
PhiNode phi = (PhiNode) b;
|
|
516 |
assert phi.valueCount() == 2;
|
|
517 |
return phi.valueAt(1);
|
|
518 |
} else if (nodesReady) {
|
|
519 |
ValueNode v = getDuplicatedNode(b);
|
|
520 |
if (v == null) {
|
|
521 |
return b;
|
|
522 |
}
|
|
523 |
return v;
|
|
524 |
} else {
|
|
525 |
return b;
|
|
526 |
}
|
|
527 |
}
|
|
528 |
|
50330
|
529 |
@SuppressWarnings("try")
|
43972
|
530 |
private AbstractBeginNode mergeEnds() {
|
|
531 |
assert isDuplicate();
|
|
532 |
List<EndNode> endsToMerge = new LinkedList<>();
|
|
533 |
// map peel exits to the corresponding loop exits
|
46344
|
534 |
EconomicMap<AbstractEndNode, LoopEndNode> reverseEnds = EconomicMap.create(Equivalence.IDENTITY);
|
43972
|
535 |
LoopBeginNode loopBegin = original().loop().loopBegin();
|
|
536 |
for (LoopEndNode le : loopBegin.loopEnds()) {
|
|
537 |
AbstractEndNode duplicate = getDuplicatedNode(le);
|
|
538 |
if (duplicate != null) {
|
|
539 |
endsToMerge.add((EndNode) duplicate);
|
|
540 |
reverseEnds.put(duplicate, le);
|
|
541 |
}
|
|
542 |
}
|
46344
|
543 |
mergedInitializers = EconomicMap.create(Equivalence.IDENTITY);
|
43972
|
544 |
AbstractBeginNode newExit;
|
|
545 |
StructuredGraph graph = graph();
|
|
546 |
if (endsToMerge.size() == 1) {
|
|
547 |
AbstractEndNode end = endsToMerge.get(0);
|
|
548 |
assert end.hasNoUsages();
|
50330
|
549 |
try (DebugCloseable position = end.withNodeSourcePosition()) {
|
|
550 |
newExit = graph.add(new BeginNode());
|
|
551 |
end.replaceAtPredecessor(newExit);
|
|
552 |
end.safeDelete();
|
|
553 |
}
|
43972
|
554 |
} else {
|
|
555 |
assert endsToMerge.size() > 1;
|
|
556 |
AbstractMergeNode newExitMerge = graph.add(new MergeNode());
|
|
557 |
newExit = newExitMerge;
|
|
558 |
FrameState state = loopBegin.stateAfter();
|
|
559 |
FrameState duplicateState = null;
|
|
560 |
if (state != null) {
|
|
561 |
duplicateState = state.duplicateWithVirtualState();
|
|
562 |
newExitMerge.setStateAfter(duplicateState);
|
|
563 |
}
|
|
564 |
for (EndNode end : endsToMerge) {
|
|
565 |
newExitMerge.addForwardEnd(end);
|
|
566 |
}
|
|
567 |
|
|
568 |
for (final PhiNode phi : loopBegin.phis().snapshot()) {
|
|
569 |
if (phi.hasNoUsages()) {
|
|
570 |
continue;
|
|
571 |
}
|
|
572 |
final PhiNode firstPhi = patchPhi(graph, phi, newExitMerge);
|
|
573 |
for (AbstractEndNode end : newExitMerge.forwardEnds()) {
|
|
574 |
LoopEndNode loopEnd = reverseEnds.get(end);
|
|
575 |
ValueNode prim = prim(phi.valueAt(loopEnd));
|
|
576 |
assert prim != null;
|
|
577 |
firstPhi.addInput(prim);
|
|
578 |
}
|
|
579 |
ValueNode initializer = firstPhi;
|
|
580 |
if (duplicateState != null) {
|
|
581 |
// fix the merge's state after
|
|
582 |
duplicateState.applyToNonVirtual(new NodeClosure<ValueNode>() {
|
|
583 |
|
|
584 |
@Override
|
|
585 |
public void apply(Node from, ValueNode node) {
|
|
586 |
if (node == phi) {
|
|
587 |
from.replaceFirstInput(phi, firstPhi);
|
|
588 |
}
|
|
589 |
}
|
|
590 |
});
|
|
591 |
}
|
46344
|
592 |
mergedInitializers.put(phi, initializer);
|
43972
|
593 |
}
|
|
594 |
}
|
|
595 |
return newExit;
|
|
596 |
}
|
|
597 |
}
|