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/*
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* Copyright (c) 2015, 2017, 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.phases.common;
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import static org.graalvm.compiler.nodes.StaticDeoptimizingNode.mergeActions;
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import java.util.ArrayDeque;
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import java.util.Deque;
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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 jdk.internal.vm.compiler.collections.MapCursor;
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import jdk.internal.vm.compiler.collections.Pair;
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import org.graalvm.compiler.core.common.cfg.AbstractControlFlowGraph;
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import org.graalvm.compiler.core.common.cfg.BlockMap;
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import org.graalvm.compiler.core.common.type.ArithmeticOpTable;
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import org.graalvm.compiler.core.common.type.ArithmeticOpTable.BinaryOp;
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import org.graalvm.compiler.core.common.type.ArithmeticOpTable.BinaryOp.And;
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import org.graalvm.compiler.core.common.type.ArithmeticOpTable.BinaryOp.Or;
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import org.graalvm.compiler.core.common.type.IntegerStamp;
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import org.graalvm.compiler.core.common.type.ObjectStamp;
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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.CounterKey;
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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.graph.Node;
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import org.graalvm.compiler.graph.NodeMap;
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import org.graalvm.compiler.graph.NodeStack;
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import org.graalvm.compiler.graph.spi.CanonicalizerTool;
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import org.graalvm.compiler.nodeinfo.InputType;
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import org.graalvm.compiler.nodes.AbstractBeginNode;
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import org.graalvm.compiler.nodes.AbstractMergeNode;
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import org.graalvm.compiler.nodes.BinaryOpLogicNode;
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import org.graalvm.compiler.nodes.ConditionAnchorNode;
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import org.graalvm.compiler.nodes.DeoptimizeNode;
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import org.graalvm.compiler.nodes.DeoptimizingGuard;
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import org.graalvm.compiler.nodes.EndNode;
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import org.graalvm.compiler.nodes.FixedGuardNode;
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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.GuardNode;
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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.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.ParameterNode;
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import org.graalvm.compiler.nodes.PiNode;
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import org.graalvm.compiler.nodes.ProxyNode;
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import org.graalvm.compiler.nodes.ShortCircuitOrNode;
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import org.graalvm.compiler.nodes.StructuredGraph;
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import org.graalvm.compiler.nodes.StructuredGraph.ScheduleResult;
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import org.graalvm.compiler.nodes.UnaryOpLogicNode;
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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.calc.AndNode;
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import org.graalvm.compiler.nodes.calc.BinaryArithmeticNode;
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import org.graalvm.compiler.nodes.calc.BinaryNode;
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import org.graalvm.compiler.nodes.calc.IntegerEqualsNode;
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import org.graalvm.compiler.nodes.calc.UnaryNode;
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import org.graalvm.compiler.nodes.cfg.Block;
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import org.graalvm.compiler.nodes.cfg.ControlFlowGraph;
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import org.graalvm.compiler.nodes.extended.GuardingNode;
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import org.graalvm.compiler.nodes.extended.IntegerSwitchNode;
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import org.graalvm.compiler.nodes.extended.LoadHubNode;
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import org.graalvm.compiler.nodes.extended.ValueAnchorNode;
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import org.graalvm.compiler.nodes.java.TypeSwitchNode;
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import org.graalvm.compiler.nodes.spi.NodeWithState;
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import org.graalvm.compiler.nodes.spi.StampInverter;
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import org.graalvm.compiler.nodes.util.GraphUtil;
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import org.graalvm.compiler.phases.BasePhase;
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import org.graalvm.compiler.phases.schedule.SchedulePhase;
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import org.graalvm.compiler.phases.schedule.SchedulePhase.SchedulingStrategy;
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import org.graalvm.compiler.phases.tiers.PhaseContext;
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import jdk.vm.ci.meta.DeoptimizationAction;
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import jdk.vm.ci.meta.JavaConstant;
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import jdk.vm.ci.meta.SpeculationLog.Speculation;
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import jdk.vm.ci.meta.TriState;
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public class ConditionalEliminationPhase extends BasePhase<PhaseContext> {
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private static final CounterKey counterStampsRegistered = DebugContext.counter("StampsRegistered");
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private static final CounterKey counterStampsFound = DebugContext.counter("StampsFound");
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private static final CounterKey counterIfsKilled = DebugContext.counter("CE_KilledIfs");
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private static final CounterKey counterPhiStampsImproved = DebugContext.counter("CE_ImprovedPhis");
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private final boolean fullSchedule;
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private final boolean moveGuards;
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public ConditionalEliminationPhase(boolean fullSchedule) {
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this(fullSchedule, true);
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}
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public ConditionalEliminationPhase(boolean fullSchedule, boolean moveGuards) {
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this.fullSchedule = fullSchedule;
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this.moveGuards = moveGuards;
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}
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@Override
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@SuppressWarnings("try")
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protected void run(StructuredGraph graph, PhaseContext context) {
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try (DebugContext.Scope s = graph.getDebug().scope("DominatorConditionalElimination")) {
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BlockMap<List<Node>> blockToNodes = null;
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NodeMap<Block> nodeToBlock = null;
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ControlFlowGraph cfg = ControlFlowGraph.compute(graph, true, true, true, true);
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if (fullSchedule) {
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if (moveGuards) {
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cfg.visitDominatorTree(new MoveGuardsUpwards(), graph.hasValueProxies());
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}
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try (DebugContext.Scope scheduleScope = graph.getDebug().scope(SchedulePhase.class)) {
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SchedulePhase.run(graph, SchedulingStrategy.EARLIEST_WITH_GUARD_ORDER, cfg);
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} catch (Throwable t) {
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throw graph.getDebug().handle(t);
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}
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ScheduleResult r = graph.getLastSchedule();
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blockToNodes = r.getBlockToNodesMap();
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nodeToBlock = r.getNodeToBlockMap();
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} else {
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nodeToBlock = cfg.getNodeToBlock();
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blockToNodes = getBlockToNodes(cfg);
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}
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ControlFlowGraph.RecursiveVisitor<?> visitor = createVisitor(graph, cfg, blockToNodes, nodeToBlock, context);
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cfg.visitDominatorTree(visitor, graph.hasValueProxies());
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}
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}
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protected BlockMap<List<Node>> getBlockToNodes(@SuppressWarnings("unused") ControlFlowGraph cfg) {
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return null;
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}
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protected ControlFlowGraph.RecursiveVisitor<?> createVisitor(StructuredGraph graph, @SuppressWarnings("unused") ControlFlowGraph cfg, BlockMap<List<Node>> blockToNodes,
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NodeMap<Block> nodeToBlock, PhaseContext context) {
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return new Instance(graph, blockToNodes, nodeToBlock, context);
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}
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public static class MoveGuardsUpwards implements ControlFlowGraph.RecursiveVisitor<Block> {
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Block anchorBlock;
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@Override
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@SuppressWarnings("try")
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public Block enter(Block b) {
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Block oldAnchorBlock = anchorBlock;
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if (b.getDominator() == null || b.getDominator().getPostdominator() != b) {
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// New anchor.
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anchorBlock = b;
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}
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AbstractBeginNode beginNode = b.getBeginNode();
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if (beginNode instanceof AbstractMergeNode && anchorBlock != b) {
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AbstractMergeNode mergeNode = (AbstractMergeNode) beginNode;
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for (GuardNode guard : mergeNode.guards().snapshot()) {
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try (DebugCloseable closeable = guard.withNodeSourcePosition()) {
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GuardNode newlyCreatedGuard = new GuardNode(guard.getCondition(), anchorBlock.getBeginNode(), guard.getReason(), guard.getAction(), guard.isNegated(), guard.getSpeculation(),
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guard.getNoDeoptSuccessorPosition());
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GuardNode newGuard = mergeNode.graph().unique(newlyCreatedGuard);
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guard.replaceAndDelete(newGuard);
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}
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}
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}
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FixedNode endNode = b.getEndNode();
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if (endNode instanceof IfNode) {
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IfNode node = (IfNode) endNode;
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// Check if we can move guards upwards.
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AbstractBeginNode trueSuccessor = node.trueSuccessor();
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EconomicMap<LogicNode, GuardNode> trueGuards = EconomicMap.create(Equivalence.IDENTITY);
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for (GuardNode guard : trueSuccessor.guards()) {
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LogicNode condition = guard.getCondition();
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if (condition.hasMoreThanOneUsage()) {
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trueGuards.put(condition, guard);
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}
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}
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if (!trueGuards.isEmpty()) {
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for (GuardNode guard : node.falseSuccessor().guards().snapshot()) {
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GuardNode otherGuard = trueGuards.get(guard.getCondition());
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if (otherGuard != null && guard.isNegated() == otherGuard.isNegated()) {
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Speculation speculation = otherGuard.getSpeculation();
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if (speculation == null) {
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speculation = guard.getSpeculation();
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} else if (guard.getSpeculation() != null && guard.getSpeculation() != speculation) {
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// Cannot optimize due to different speculations.
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continue;
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}
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try (DebugCloseable closeable = guard.withNodeSourcePosition()) {
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GuardNode newlyCreatedGuard = new GuardNode(guard.getCondition(), anchorBlock.getBeginNode(), guard.getReason(), guard.getAction(), guard.isNegated(), speculation,
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guard.getNoDeoptSuccessorPosition());
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GuardNode newGuard = node.graph().unique(newlyCreatedGuard);
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if (otherGuard.isAlive()) {
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otherGuard.replaceAndDelete(newGuard);
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}
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guard.replaceAndDelete(newGuard);
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}
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}
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}
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}
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}
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return oldAnchorBlock;
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}
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@Override
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public void exit(Block b, Block value) {
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anchorBlock = value;
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}
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}
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private static final class PhiInfoElement {
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private EconomicMap<EndNode, InfoElement> infoElements;
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public void set(EndNode end, InfoElement infoElement) {
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if (infoElements == null) {
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infoElements = EconomicMap.create(Equivalence.IDENTITY);
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}
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infoElements.put(end, infoElement);
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}
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public InfoElement get(EndNode end) {
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if (infoElements == null) {
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return null;
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}
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return infoElements.get(end);
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}
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}
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public static final class Marks {
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final int infoElementOperations;
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final int conditions;
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public Marks(int infoElementOperations, int conditions) {
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this.infoElementOperations = infoElementOperations;
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this.conditions = conditions;
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}
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}
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protected static final class GuardedCondition {
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private final GuardingNode guard;
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private final LogicNode condition;
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private final boolean negated;
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public GuardedCondition(GuardingNode guard, LogicNode condition, boolean negated) {
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this.guard = guard;
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this.condition = condition;
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this.negated = negated;
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}
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public GuardingNode getGuard() {
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return guard;
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}
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public LogicNode getCondition() {
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return condition;
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}
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public boolean isNegated() {
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return negated;
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}
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}
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public static class Instance implements ControlFlowGraph.RecursiveVisitor<Marks> {
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protected final NodeMap<InfoElement> map;
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protected final BlockMap<List<Node>> blockToNodes;
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protected final NodeMap<Block> nodeToBlock;
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protected final CanonicalizerTool tool;
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protected final NodeStack undoOperations;
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protected final StructuredGraph graph;
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protected final DebugContext debug;
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protected final EconomicMap<MergeNode, EconomicMap<ValuePhiNode, PhiInfoElement>> mergeMaps;
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protected final ArrayDeque<GuardedCondition> conditions;
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/**
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* Tests which may be eliminated because post dominating tests to prove a broader condition.
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*/
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private Deque<DeoptimizingGuard> pendingTests;
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public Instance(StructuredGraph graph, BlockMap<List<Node>> blockToNodes, NodeMap<Block> nodeToBlock, PhaseContext context) {
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this.graph = graph;
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this.debug = graph.getDebug();
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this.blockToNodes = blockToNodes;
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this.nodeToBlock = nodeToBlock;
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this.undoOperations = new NodeStack();
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this.map = graph.createNodeMap();
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this.pendingTests = new ArrayDeque<>();
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this.conditions = new ArrayDeque<>();
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tool = GraphUtil.getDefaultSimplifier(context.getMetaAccess(), context.getConstantReflection(), context.getConstantFieldProvider(), false, graph.getAssumptions(), graph.getOptions(),
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context.getLowerer());
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mergeMaps = EconomicMap.create();
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}
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protected void processConditionAnchor(ConditionAnchorNode node) {
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319 |
tryProveCondition(node.condition(), (guard, result, guardedValueStamp, newInput) -> {
|
|
|
320 |
if (result != node.isNegated()) {
|
|
|
321 |
node.replaceAtUsages(guard.asNode());
|
|
|
322 |
GraphUtil.unlinkFixedNode(node);
|
|
|
323 |
GraphUtil.killWithUnusedFloatingInputs(node);
|
|
|
324 |
} else {
|
|
|
325 |
ValueAnchorNode valueAnchor = node.graph().add(new ValueAnchorNode(null));
|
|
|
326 |
node.replaceAtUsages(valueAnchor);
|
|
|
327 |
node.graph().replaceFixedWithFixed(node, valueAnchor);
|
|
|
328 |
}
|
|
|
329 |
return true;
|
|
|
330 |
});
|
|
|
331 |
}
|
|
|
332 |
|
|
|
333 |
protected void processGuard(GuardNode node) {
|
|
|
334 |
if (!tryProveGuardCondition(node, node.getCondition(), (guard, result, guardedValueStamp, newInput) -> {
|
|
|
335 |
if (result != node.isNegated()) {
|
|
|
336 |
node.replaceAndDelete(guard.asNode());
|
|
|
337 |
} else {
|
|
|
338 |
DeoptimizeNode deopt = node.graph().add(new DeoptimizeNode(node.getAction(), node.getReason(), node.getSpeculation()));
|
|
|
339 |
AbstractBeginNode beginNode = (AbstractBeginNode) node.getAnchor();
|
|
|
340 |
FixedNode next = beginNode.next();
|
|
|
341 |
beginNode.setNext(deopt);
|
|
|
342 |
GraphUtil.killCFG(next);
|
|
|
343 |
}
|
|
|
344 |
return true;
|
|
|
345 |
})) {
|
|
|
346 |
registerNewCondition(node.getCondition(), node.isNegated(), node);
|
|
|
347 |
}
|
|
|
348 |
}
|
|
|
349 |
|
|
|
350 |
protected void processFixedGuard(FixedGuardNode node) {
|
|
|
351 |
if (!tryProveGuardCondition(node, node.condition(), (guard, result, guardedValueStamp, newInput) -> {
|
|
|
352 |
if (result != node.isNegated()) {
|
|
|
353 |
node.replaceAtUsages(guard.asNode());
|
|
|
354 |
GraphUtil.unlinkFixedNode(node);
|
|
|
355 |
GraphUtil.killWithUnusedFloatingInputs(node);
|
|
|
356 |
} else {
|
|
|
357 |
DeoptimizeNode deopt = node.graph().add(new DeoptimizeNode(node.getAction(), node.getReason(), node.getSpeculation()));
|
|
|
358 |
deopt.setStateBefore(node.stateBefore());
|
|
|
359 |
node.replaceAtPredecessor(deopt);
|
|
|
360 |
GraphUtil.killCFG(node);
|
|
|
361 |
}
|
|
46640
|
362 |
debug.log("Kill fixed guard guard");
|
|
46459
|
363 |
return true;
|
|
|
364 |
})) {
|
|
|
365 |
registerNewCondition(node.condition(), node.isNegated(), node);
|
|
|
366 |
}
|
|
|
367 |
}
|
|
|
368 |
|
|
|
369 |
protected void processIf(IfNode node) {
|
|
|
370 |
tryProveCondition(node.condition(), (guard, result, guardedValueStamp, newInput) -> {
|
|
|
371 |
AbstractBeginNode survivingSuccessor = node.getSuccessor(result);
|
|
|
372 |
survivingSuccessor.replaceAtUsages(InputType.Guard, guard.asNode());
|
|
|
373 |
survivingSuccessor.replaceAtPredecessor(null);
|
|
|
374 |
node.replaceAtPredecessor(survivingSuccessor);
|
|
|
375 |
GraphUtil.killCFG(node);
|
|
46640
|
376 |
counterIfsKilled.increment(debug);
|
|
46459
|
377 |
return true;
|
|
|
378 |
});
|
|
|
379 |
}
|
|
|
380 |
|
|
|
381 |
@Override
|
|
50330
|
382 |
public Marks enter(Block block) {
|
|
|
383 |
int infoElementsMark = undoOperations.size();
|
|
|
384 |
int conditionsMark = conditions.size();
|
|
46640
|
385 |
debug.log("[Pre Processing block %s]", block);
|
|
46459
|
386 |
// For now conservatively collect guards only within the same block.
|
|
|
387 |
pendingTests.clear();
|
|
|
388 |
processNodes(block);
|
|
50330
|
389 |
return new Marks(infoElementsMark, conditionsMark);
|
|
46459
|
390 |
}
|
|
|
391 |
|
|
|
392 |
protected void processNodes(Block block) {
|
|
|
393 |
if (blockToNodes != null) {
|
|
|
394 |
for (Node n : blockToNodes.get(block)) {
|
|
|
395 |
if (n.isAlive()) {
|
|
|
396 |
processNode(n);
|
|
|
397 |
}
|
|
|
398 |
}
|
|
|
399 |
} else {
|
|
|
400 |
processBlock(block);
|
|
|
401 |
}
|
|
|
402 |
}
|
|
|
403 |
|
|
|
404 |
private void processBlock(Block block) {
|
|
|
405 |
FixedNode n = block.getBeginNode();
|
|
|
406 |
FixedNode endNode = block.getEndNode();
|
|
46640
|
407 |
debug.log("[Processing block %s]", block);
|
|
46459
|
408 |
while (n != endNode) {
|
|
|
409 |
if (n.isDeleted() || endNode.isDeleted()) {
|
|
|
410 |
// This branch was deleted!
|
|
|
411 |
return;
|
|
|
412 |
}
|
|
|
413 |
FixedNode next = ((FixedWithNextNode) n).next();
|
|
|
414 |
processNode(n);
|
|
|
415 |
n = next;
|
|
|
416 |
}
|
|
|
417 |
if (endNode.isAlive()) {
|
|
|
418 |
processNode(endNode);
|
|
|
419 |
}
|
|
|
420 |
}
|
|
|
421 |
|
|
|
422 |
@SuppressWarnings("try")
|
|
|
423 |
protected void processNode(Node node) {
|
|
|
424 |
try (DebugCloseable closeable = node.withNodeSourcePosition()) {
|
|
|
425 |
if (node instanceof NodeWithState && !(node instanceof GuardingNode)) {
|
|
|
426 |
pendingTests.clear();
|
|
|
427 |
}
|
|
|
428 |
|
|
|
429 |
if (node instanceof MergeNode) {
|
|
|
430 |
introducePisForPhis((MergeNode) node);
|
|
|
431 |
}
|
|
|
432 |
|
|
|
433 |
if (node instanceof AbstractBeginNode) {
|
|
|
434 |
if (node instanceof LoopExitNode && graph.hasValueProxies()) {
|
|
|
435 |
// Condition must not be used down this path.
|
|
|
436 |
return;
|
|
|
437 |
}
|
|
|
438 |
processAbstractBegin((AbstractBeginNode) node);
|
|
|
439 |
} else if (node instanceof FixedGuardNode) {
|
|
|
440 |
processFixedGuard((FixedGuardNode) node);
|
|
|
441 |
} else if (node instanceof GuardNode) {
|
|
|
442 |
processGuard((GuardNode) node);
|
|
|
443 |
} else if (node instanceof ConditionAnchorNode) {
|
|
|
444 |
processConditionAnchor((ConditionAnchorNode) node);
|
|
|
445 |
} else if (node instanceof IfNode) {
|
|
|
446 |
processIf((IfNode) node);
|
|
|
447 |
} else if (node instanceof EndNode) {
|
|
|
448 |
processEnd((EndNode) node);
|
|
|
449 |
}
|
|
|
450 |
}
|
|
|
451 |
}
|
|
|
452 |
|
|
|
453 |
protected void introducePisForPhis(MergeNode merge) {
|
|
|
454 |
EconomicMap<ValuePhiNode, PhiInfoElement> mergeMap = this.mergeMaps.get(merge);
|
|
|
455 |
if (mergeMap != null) {
|
|
|
456 |
MapCursor<ValuePhiNode, PhiInfoElement> entries = mergeMap.getEntries();
|
|
|
457 |
while (entries.advance()) {
|
|
|
458 |
ValuePhiNode phi = entries.getKey();
|
|
46509
|
459 |
assert phi.isAlive() || phi.isDeleted();
|
|
|
460 |
/*
|
|
|
461 |
* Phi might have been killed already via a conditional elimination in another
|
|
|
462 |
* branch.
|
|
|
463 |
*/
|
|
|
464 |
if (phi.isDeleted()) {
|
|
|
465 |
continue;
|
|
|
466 |
}
|
|
46459
|
467 |
PhiInfoElement phiInfoElements = entries.getValue();
|
|
|
468 |
Stamp bestPossibleStamp = null;
|
|
|
469 |
for (int i = 0; i < phi.valueCount(); ++i) {
|
|
|
470 |
ValueNode valueAt = phi.valueAt(i);
|
|
48190
|
471 |
Stamp curBestStamp = valueAt.stamp(NodeView.DEFAULT);
|
|
46459
|
472 |
InfoElement infoElement = phiInfoElements.get(merge.forwardEndAt(i));
|
|
|
473 |
if (infoElement != null) {
|
|
|
474 |
curBestStamp = curBestStamp.join(infoElement.getStamp());
|
|
|
475 |
}
|
|
|
476 |
|
|
|
477 |
if (bestPossibleStamp == null) {
|
|
|
478 |
bestPossibleStamp = curBestStamp;
|
|
|
479 |
} else {
|
|
|
480 |
bestPossibleStamp = bestPossibleStamp.meet(curBestStamp);
|
|
|
481 |
}
|
|
|
482 |
}
|
|
|
483 |
|
|
48190
|
484 |
Stamp oldStamp = phi.stamp(NodeView.DEFAULT);
|
|
46459
|
485 |
if (oldStamp.tryImproveWith(bestPossibleStamp) != null) {
|
|
|
486 |
|
|
|
487 |
// Need to be careful to not run into stamp update cycles with the iterative
|
|
|
488 |
// canonicalization.
|
|
|
489 |
boolean allow = false;
|
|
|
490 |
if (bestPossibleStamp instanceof ObjectStamp) {
|
|
|
491 |
// Always allow object stamps.
|
|
|
492 |
allow = true;
|
|
|
493 |
} else if (bestPossibleStamp instanceof IntegerStamp) {
|
|
|
494 |
IntegerStamp integerStamp = (IntegerStamp) bestPossibleStamp;
|
|
|
495 |
IntegerStamp oldIntegerStamp = (IntegerStamp) oldStamp;
|
|
|
496 |
if (integerStamp.isPositive() != oldIntegerStamp.isPositive()) {
|
|
|
497 |
allow = true;
|
|
|
498 |
} else if (integerStamp.isNegative() != oldIntegerStamp.isNegative()) {
|
|
|
499 |
allow = true;
|
|
|
500 |
} else if (integerStamp.isStrictlyPositive() != oldIntegerStamp.isStrictlyPositive()) {
|
|
|
501 |
allow = true;
|
|
|
502 |
} else if (integerStamp.isStrictlyNegative() != oldIntegerStamp.isStrictlyNegative()) {
|
|
|
503 |
allow = true;
|
|
|
504 |
} else if (integerStamp.asConstant() != null) {
|
|
|
505 |
allow = true;
|
|
|
506 |
} else if (oldStamp.isUnrestricted()) {
|
|
|
507 |
allow = true;
|
|
|
508 |
}
|
|
|
509 |
} else {
|
|
|
510 |
allow = (bestPossibleStamp.asConstant() != null);
|
|
|
511 |
}
|
|
|
512 |
|
|
|
513 |
if (allow) {
|
|
|
514 |
ValuePhiNode newPhi = graph.addWithoutUnique(new ValuePhiNode(bestPossibleStamp, merge));
|
|
|
515 |
for (int i = 0; i < phi.valueCount(); ++i) {
|
|
|
516 |
ValueNode valueAt = phi.valueAt(i);
|
|
48190
|
517 |
if (bestPossibleStamp.meet(valueAt.stamp(NodeView.DEFAULT)).equals(bestPossibleStamp)) {
|
|
46459
|
518 |
// Pi not required here.
|
|
|
519 |
} else {
|
|
|
520 |
InfoElement infoElement = phiInfoElements.get(merge.forwardEndAt(i));
|
|
|
521 |
assert infoElement != null;
|
|
|
522 |
Stamp curBestStamp = infoElement.getStamp();
|
|
|
523 |
ValueNode input = infoElement.getProxifiedInput();
|
|
|
524 |
if (input == null) {
|
|
|
525 |
input = valueAt;
|
|
|
526 |
}
|
|
|
527 |
ValueNode valueNode = graph.maybeAddOrUnique(PiNode.create(input, curBestStamp, (ValueNode) infoElement.guard));
|
|
|
528 |
valueAt = valueNode;
|
|
|
529 |
}
|
|
|
530 |
newPhi.addInput(valueAt);
|
|
|
531 |
}
|
|
46640
|
532 |
counterPhiStampsImproved.increment(debug);
|
|
46459
|
533 |
phi.replaceAtUsagesAndDelete(newPhi);
|
|
|
534 |
}
|
|
|
535 |
}
|
|
|
536 |
}
|
|
|
537 |
}
|
|
|
538 |
}
|
|
|
539 |
|
|
|
540 |
protected void processEnd(EndNode end) {
|
|
|
541 |
AbstractMergeNode abstractMerge = end.merge();
|
|
|
542 |
if (abstractMerge instanceof MergeNode) {
|
|
|
543 |
MergeNode merge = (MergeNode) abstractMerge;
|
|
|
544 |
|
|
|
545 |
EconomicMap<ValuePhiNode, PhiInfoElement> mergeMap = this.mergeMaps.get(merge);
|
|
|
546 |
for (ValuePhiNode phi : merge.valuePhis()) {
|
|
|
547 |
ValueNode valueAt = phi.valueAt(end);
|
|
|
548 |
InfoElement infoElement = this.getInfoElements(valueAt);
|
|
|
549 |
while (infoElement != null) {
|
|
|
550 |
Stamp newStamp = infoElement.getStamp();
|
|
48190
|
551 |
if (phi.stamp(NodeView.DEFAULT).tryImproveWith(newStamp) != null) {
|
|
46459
|
552 |
if (mergeMap == null) {
|
|
|
553 |
mergeMap = EconomicMap.create();
|
|
|
554 |
mergeMaps.put(merge, mergeMap);
|
|
|
555 |
}
|
|
|
556 |
|
|
|
557 |
PhiInfoElement phiInfoElement = mergeMap.get(phi);
|
|
|
558 |
if (phiInfoElement == null) {
|
|
|
559 |
phiInfoElement = new PhiInfoElement();
|
|
|
560 |
mergeMap.put(phi, phiInfoElement);
|
|
|
561 |
}
|
|
|
562 |
|
|
|
563 |
phiInfoElement.set(end, infoElement);
|
|
|
564 |
break;
|
|
|
565 |
}
|
|
|
566 |
infoElement = nextElement(infoElement);
|
|
|
567 |
}
|
|
|
568 |
}
|
|
|
569 |
}
|
|
|
570 |
}
|
|
|
571 |
|
|
|
572 |
protected void registerNewCondition(LogicNode condition, boolean negated, GuardingNode guard) {
|
|
|
573 |
if (condition instanceof UnaryOpLogicNode) {
|
|
|
574 |
UnaryOpLogicNode unaryLogicNode = (UnaryOpLogicNode) condition;
|
|
|
575 |
ValueNode value = unaryLogicNode.getValue();
|
|
|
576 |
if (maybeMultipleUsages(value)) {
|
|
50330
|
577 |
// getSucceedingStampForValue doesn't take the (potentially a Pi Node) input
|
|
|
578 |
// stamp into account, so it can be safely propagated.
|
|
46459
|
579 |
Stamp newStamp = unaryLogicNode.getSucceedingStampForValue(negated);
|
|
50330
|
580 |
registerNewStamp(value, newStamp, guard, true);
|
|
46459
|
581 |
}
|
|
|
582 |
} else if (condition instanceof BinaryOpLogicNode) {
|
|
|
583 |
BinaryOpLogicNode binaryOpLogicNode = (BinaryOpLogicNode) condition;
|
|
|
584 |
ValueNode x = binaryOpLogicNode.getX();
|
|
|
585 |
ValueNode y = binaryOpLogicNode.getY();
|
|
|
586 |
if (!x.isConstant() && maybeMultipleUsages(x)) {
|
|
|
587 |
Stamp newStampX = binaryOpLogicNode.getSucceedingStampForX(negated, getSafeStamp(x), getOtherSafeStamp(y));
|
|
|
588 |
registerNewStamp(x, newStampX, guard);
|
|
|
589 |
}
|
|
|
590 |
|
|
|
591 |
if (!y.isConstant() && maybeMultipleUsages(y)) {
|
|
|
592 |
Stamp newStampY = binaryOpLogicNode.getSucceedingStampForY(negated, getOtherSafeStamp(x), getSafeStamp(y));
|
|
|
593 |
registerNewStamp(y, newStampY, guard);
|
|
|
594 |
}
|
|
|
595 |
|
|
|
596 |
if (condition instanceof IntegerEqualsNode && guard instanceof DeoptimizingGuard && !negated) {
|
|
|
597 |
if (y.isConstant() && x instanceof AndNode) {
|
|
|
598 |
AndNode and = (AndNode) x;
|
|
|
599 |
ValueNode andX = and.getX();
|
|
|
600 |
if (and.getY() == y && maybeMultipleUsages(andX)) {
|
|
|
601 |
/*
|
|
|
602 |
* This 'and' proves something about some of the bits in and.getX().
|
|
|
603 |
* It's equivalent to or'ing in the mask value since those values are
|
|
|
604 |
* known to be set.
|
|
|
605 |
*/
|
|
48190
|
606 |
BinaryOp<Or> op = ArithmeticOpTable.forStamp(x.stamp(NodeView.DEFAULT)).getOr();
|
|
46459
|
607 |
IntegerStamp newStampX = (IntegerStamp) op.foldStamp(getSafeStamp(andX), getOtherSafeStamp(y));
|
|
|
608 |
registerNewStamp(andX, newStampX, guard);
|
|
|
609 |
}
|
|
|
610 |
}
|
|
|
611 |
}
|
|
|
612 |
}
|
|
|
613 |
if (guard instanceof DeoptimizingGuard) {
|
|
47798
|
614 |
assert ((DeoptimizingGuard) guard).getCondition() == condition;
|
|
|
615 |
pendingTests.push((DeoptimizingGuard) guard);
|
|
46459
|
616 |
}
|
|
|
617 |
registerCondition(condition, negated, guard);
|
|
|
618 |
}
|
|
|
619 |
|
|
|
620 |
Pair<InfoElement, Stamp> recursiveFoldStamp(Node node) {
|
|
|
621 |
if (node instanceof UnaryNode) {
|
|
|
622 |
UnaryNode unary = (UnaryNode) node;
|
|
|
623 |
ValueNode value = unary.getValue();
|
|
|
624 |
InfoElement infoElement = getInfoElements(value);
|
|
|
625 |
while (infoElement != null) {
|
|
|
626 |
Stamp result = unary.foldStamp(infoElement.getStamp());
|
|
|
627 |
if (result != null) {
|
|
|
628 |
return Pair.create(infoElement, result);
|
|
|
629 |
}
|
|
|
630 |
infoElement = nextElement(infoElement);
|
|
|
631 |
}
|
|
|
632 |
} else if (node instanceof BinaryNode) {
|
|
|
633 |
BinaryNode binary = (BinaryNode) node;
|
|
|
634 |
ValueNode y = binary.getY();
|
|
|
635 |
ValueNode x = binary.getX();
|
|
|
636 |
if (y.isConstant()) {
|
|
|
637 |
InfoElement infoElement = getInfoElements(x);
|
|
|
638 |
while (infoElement != null) {
|
|
48190
|
639 |
Stamp result = binary.foldStamp(infoElement.stamp, y.stamp(NodeView.DEFAULT));
|
|
46459
|
640 |
if (result != null) {
|
|
|
641 |
return Pair.create(infoElement, result);
|
|
|
642 |
}
|
|
|
643 |
infoElement = nextElement(infoElement);
|
|
|
644 |
}
|
|
|
645 |
}
|
|
|
646 |
}
|
|
|
647 |
return null;
|
|
|
648 |
}
|
|
|
649 |
|
|
|
650 |
/**
|
|
|
651 |
* Get the stamp that may be used for the value for which we are registering the condition.
|
|
|
652 |
* We may directly use the stamp here without restriction, because any later lookup of the
|
|
|
653 |
* registered info elements is in the same chain of pi nodes.
|
|
|
654 |
*/
|
|
|
655 |
private static Stamp getSafeStamp(ValueNode x) {
|
|
48190
|
656 |
return x.stamp(NodeView.DEFAULT);
|
|
46459
|
657 |
}
|
|
|
658 |
|
|
|
659 |
/**
|
|
|
660 |
* We can only use the stamp of a second value involved in the condition if we are sure that
|
|
|
661 |
* we are not implicitly creating a dependency on a pi node that is responsible for that
|
|
|
662 |
* stamp. For now, we are conservatively only using the stamps of constants. Under certain
|
|
|
663 |
* circumstances, we may also be able to use the stamp of the value after skipping pi nodes
|
|
|
664 |
* (e.g., the stamp of a parameter after inlining, or the stamp of a fixed node that can
|
|
|
665 |
* never be replaced with a pi node via canonicalization).
|
|
|
666 |
*/
|
|
|
667 |
private static Stamp getOtherSafeStamp(ValueNode x) {
|
|
49451
|
668 |
if (x.isConstant() || x.graph().isAfterFixedReadPhase()) {
|
|
48190
|
669 |
return x.stamp(NodeView.DEFAULT);
|
|
46459
|
670 |
}
|
|
48190
|
671 |
return x.stamp(NodeView.DEFAULT).unrestricted();
|
|
46459
|
672 |
}
|
|
|
673 |
|
|
|
674 |
/**
|
|
|
675 |
* Recursively try to fold stamps within this expression using information from
|
|
|
676 |
* {@link #getInfoElements(ValueNode)}. It's only safe to use constants and one
|
|
|
677 |
* {@link InfoElement} otherwise more than one guard would be required.
|
|
|
678 |
*
|
|
|
679 |
* @param node
|
|
|
680 |
* @return the pair of the @{link InfoElement} used and the stamp produced for the whole
|
|
|
681 |
* expression
|
|
|
682 |
*/
|
|
|
683 |
Pair<InfoElement, Stamp> recursiveFoldStampFromInfo(Node node) {
|
|
|
684 |
return recursiveFoldStamp(node);
|
|
|
685 |
}
|
|
|
686 |
|
|
49451
|
687 |
/**
|
|
|
688 |
* Look for a preceding guard whose condition is implied by {@code thisGuard}. If we find
|
|
|
689 |
* one, try to move this guard just above that preceding guard so that we can fold it:
|
|
|
690 |
*
|
|
|
691 |
* <pre>
|
|
|
692 |
* guard(C1); // preceding guard
|
|
|
693 |
* ...
|
|
|
694 |
* guard(C2); // thisGuard
|
|
|
695 |
* </pre>
|
|
|
696 |
*
|
|
|
697 |
* If C2 => C1, transform to:
|
|
|
698 |
*
|
|
|
699 |
* <pre>
|
|
|
700 |
* guard(C2);
|
|
|
701 |
* ...
|
|
|
702 |
* </pre>
|
|
|
703 |
*/
|
|
46459
|
704 |
protected boolean foldPendingTest(DeoptimizingGuard thisGuard, ValueNode original, Stamp newStamp, GuardRewirer rewireGuardFunction) {
|
|
47798
|
705 |
for (DeoptimizingGuard pendingGuard : pendingTests) {
|
|
|
706 |
LogicNode pendingCondition = pendingGuard.getCondition();
|
|
46459
|
707 |
TriState result = TriState.UNKNOWN;
|
|
47798
|
708 |
if (pendingCondition instanceof UnaryOpLogicNode) {
|
|
|
709 |
UnaryOpLogicNode unaryLogicNode = (UnaryOpLogicNode) pendingCondition;
|
|
46459
|
710 |
if (unaryLogicNode.getValue() == original) {
|
|
|
711 |
result = unaryLogicNode.tryFold(newStamp);
|
|
|
712 |
}
|
|
47798
|
713 |
} else if (pendingCondition instanceof BinaryOpLogicNode) {
|
|
|
714 |
BinaryOpLogicNode binaryOpLogicNode = (BinaryOpLogicNode) pendingCondition;
|
|
46459
|
715 |
ValueNode x = binaryOpLogicNode.getX();
|
|
|
716 |
ValueNode y = binaryOpLogicNode.getY();
|
|
|
717 |
if (x == original) {
|
|
|
718 |
result = binaryOpLogicNode.tryFold(newStamp, getOtherSafeStamp(y));
|
|
|
719 |
} else if (y == original) {
|
|
|
720 |
result = binaryOpLogicNode.tryFold(getOtherSafeStamp(x), newStamp);
|
|
|
721 |
} else if (binaryOpLogicNode instanceof IntegerEqualsNode && y.isConstant() && x instanceof AndNode) {
|
|
|
722 |
AndNode and = (AndNode) x;
|
|
|
723 |
if (and.getY() == y && and.getX() == original) {
|
|
|
724 |
BinaryOp<And> andOp = ArithmeticOpTable.forStamp(newStamp).getAnd();
|
|
|
725 |
result = binaryOpLogicNode.tryFold(andOp.foldStamp(newStamp, getOtherSafeStamp(y)), getOtherSafeStamp(y));
|
|
|
726 |
}
|
|
|
727 |
}
|
|
|
728 |
}
|
|
|
729 |
if (result.isKnown()) {
|
|
|
730 |
/*
|
|
|
731 |
* The test case be folded using the information available but the test can only
|
|
49451
|
732 |
* be moved up if we're sure there's no schedule dependence.
|
|
46459
|
733 |
*/
|
|
49451
|
734 |
if (canScheduleAbove(thisGuard.getCondition(), pendingGuard.asNode(), original) && foldGuard(thisGuard, pendingGuard, result.toBoolean(), newStamp, rewireGuardFunction)) {
|
|
46459
|
735 |
return true;
|
|
|
736 |
}
|
|
|
737 |
}
|
|
|
738 |
}
|
|
|
739 |
return false;
|
|
|
740 |
}
|
|
|
741 |
|
|
49451
|
742 |
private boolean canScheduleAbove(Node n, Node target, ValueNode knownToBeAbove) {
|
|
|
743 |
Block targetBlock = nodeToBlock.get(target);
|
|
|
744 |
Block testBlock = nodeToBlock.get(n);
|
|
|
745 |
if (targetBlock != null && testBlock != null) {
|
|
|
746 |
if (targetBlock == testBlock) {
|
|
|
747 |
for (Node fixed : blockToNodes.get(targetBlock)) {
|
|
|
748 |
if (fixed == n) {
|
|
|
749 |
return true;
|
|
|
750 |
} else if (fixed == target) {
|
|
|
751 |
break;
|
|
|
752 |
}
|
|
|
753 |
}
|
|
|
754 |
} else if (AbstractControlFlowGraph.dominates(testBlock, targetBlock)) {
|
|
|
755 |
return true;
|
|
|
756 |
}
|
|
|
757 |
}
|
|
|
758 |
InputFilter v = new InputFilter(knownToBeAbove);
|
|
|
759 |
n.applyInputs(v);
|
|
|
760 |
return v.ok;
|
|
|
761 |
}
|
|
|
762 |
|
|
48861
|
763 |
protected boolean foldGuard(DeoptimizingGuard thisGuard, DeoptimizingGuard otherGuard, boolean outcome, Stamp guardedValueStamp, GuardRewirer rewireGuardFunction) {
|
|
49451
|
764 |
DeoptimizationAction action = mergeActions(otherGuard.getAction(), thisGuard.getAction());
|
|
|
765 |
if (action != null && otherGuard.getSpeculation() == thisGuard.getSpeculation()) {
|
|
46459
|
766 |
LogicNode condition = (LogicNode) thisGuard.getCondition().copyWithInputs();
|
|
48861
|
767 |
/*
|
|
|
768 |
* We have ...; guard(C1); guard(C2);...
|
|
|
769 |
*
|
|
|
770 |
* Where the first guard is `otherGuard` and the second one `thisGuard`.
|
|
|
771 |
*
|
|
|
772 |
* Depending on `outcome`, we have C2 => C1 or C2 => !C1.
|
|
|
773 |
*
|
|
|
774 |
* - If C2 => C1, `mustDeopt` below is false and we transform to ...; guard(C2); ...
|
|
|
775 |
*
|
|
|
776 |
* - If C2 => !C1, `mustDeopt` is true and we transform to ..; guard(C1); deopt;
|
|
|
777 |
*/
|
|
49451
|
778 |
// for the second case, the action of the deopt is copied from there:
|
|
|
779 |
thisGuard.setAction(action);
|
|
46459
|
780 |
GuardRewirer rewirer = (guard, result, innerGuardedValueStamp, newInput) -> {
|
|
48861
|
781 |
// `result` is `outcome`, `guard` is `otherGuard`
|
|
|
782 |
boolean mustDeopt = result == otherGuard.isNegated();
|
|
|
783 |
if (rewireGuardFunction.rewire(guard, mustDeopt == thisGuard.isNegated(), innerGuardedValueStamp, newInput)) {
|
|
|
784 |
if (!mustDeopt) {
|
|
|
785 |
otherGuard.setCondition(condition, thisGuard.isNegated());
|
|
49451
|
786 |
otherGuard.setAction(action);
|
|
|
787 |
otherGuard.setReason(thisGuard.getReason());
|
|
48861
|
788 |
}
|
|
46459
|
789 |
return true;
|
|
|
790 |
}
|
|
|
791 |
condition.safeDelete();
|
|
|
792 |
return false;
|
|
|
793 |
};
|
|
|
794 |
// Move the later test up
|
|
48861
|
795 |
return rewireGuards(otherGuard, outcome, null, guardedValueStamp, rewirer);
|
|
46459
|
796 |
}
|
|
|
797 |
return false;
|
|
|
798 |
}
|
|
|
799 |
|
|
|
800 |
protected void registerCondition(LogicNode condition, boolean negated, GuardingNode guard) {
|
|
50330
|
801 |
if (condition.hasMoreThanOneUsage()) {
|
|
46459
|
802 |
registerNewStamp(condition, negated ? StampFactory.contradiction() : StampFactory.tautology(), guard);
|
|
|
803 |
}
|
|
50330
|
804 |
conditions.push(new GuardedCondition(guard, condition, negated));
|
|
46459
|
805 |
}
|
|
|
806 |
|
|
|
807 |
protected InfoElement getInfoElements(ValueNode proxiedValue) {
|
|
50330
|
808 |
if (proxiedValue == null) {
|
|
46459
|
809 |
return null;
|
|
|
810 |
}
|
|
50330
|
811 |
InfoElement infoElement = map.getAndGrow(proxiedValue);
|
|
|
812 |
if (infoElement == null) {
|
|
|
813 |
infoElement = map.getAndGrow(GraphUtil.skipPi(proxiedValue));
|
|
|
814 |
}
|
|
|
815 |
return infoElement;
|
|
46459
|
816 |
}
|
|
|
817 |
|
|
|
818 |
protected boolean rewireGuards(GuardingNode guard, boolean result, ValueNode proxifiedInput, Stamp guardedValueStamp, GuardRewirer rewireGuardFunction) {
|
|
46640
|
819 |
counterStampsFound.increment(debug);
|
|
46459
|
820 |
return rewireGuardFunction.rewire(guard, result, guardedValueStamp, proxifiedInput);
|
|
|
821 |
}
|
|
|
822 |
|
|
|
823 |
protected boolean tryProveCondition(LogicNode node, GuardRewirer rewireGuardFunction) {
|
|
|
824 |
return tryProveGuardCondition(null, node, rewireGuardFunction);
|
|
|
825 |
}
|
|
|
826 |
|
|
|
827 |
private InfoElement nextElement(InfoElement current) {
|
|
|
828 |
InfoElement parent = current.getParent();
|
|
|
829 |
if (parent != null) {
|
|
|
830 |
return parent;
|
|
|
831 |
} else {
|
|
|
832 |
ValueNode proxifiedInput = current.getProxifiedInput();
|
|
|
833 |
if (proxifiedInput instanceof PiNode) {
|
|
|
834 |
PiNode piNode = (PiNode) proxifiedInput;
|
|
|
835 |
return getInfoElements(piNode.getOriginalNode());
|
|
|
836 |
}
|
|
|
837 |
}
|
|
|
838 |
return null;
|
|
|
839 |
}
|
|
|
840 |
|
|
|
841 |
protected boolean tryProveGuardCondition(DeoptimizingGuard thisGuard, LogicNode node, GuardRewirer rewireGuardFunction) {
|
|
|
842 |
InfoElement infoElement = getInfoElements(node);
|
|
|
843 |
while (infoElement != null) {
|
|
|
844 |
Stamp stamp = infoElement.getStamp();
|
|
|
845 |
JavaConstant constant = (JavaConstant) stamp.asConstant();
|
|
|
846 |
if (constant != null) {
|
|
|
847 |
// No proxified input and stamp required.
|
|
|
848 |
return rewireGuards(infoElement.getGuard(), constant.asBoolean(), null, null, rewireGuardFunction);
|
|
|
849 |
}
|
|
|
850 |
infoElement = nextElement(infoElement);
|
|
|
851 |
}
|
|
|
852 |
|
|
50330
|
853 |
for (GuardedCondition guardedCondition : this.conditions) {
|
|
|
854 |
TriState result = guardedCondition.getCondition().implies(guardedCondition.isNegated(), node);
|
|
|
855 |
if (result.isKnown()) {
|
|
|
856 |
return rewireGuards(guardedCondition.guard, result.toBoolean(), null, null, rewireGuardFunction);
|
|
|
857 |
}
|
|
|
858 |
}
|
|
|
859 |
|
|
46459
|
860 |
if (node instanceof UnaryOpLogicNode) {
|
|
|
861 |
UnaryOpLogicNode unaryLogicNode = (UnaryOpLogicNode) node;
|
|
|
862 |
ValueNode value = unaryLogicNode.getValue();
|
|
|
863 |
infoElement = getInfoElements(value);
|
|
|
864 |
while (infoElement != null) {
|
|
|
865 |
Stamp stamp = infoElement.getStamp();
|
|
|
866 |
TriState result = unaryLogicNode.tryFold(stamp);
|
|
|
867 |
if (result.isKnown()) {
|
|
|
868 |
return rewireGuards(infoElement.getGuard(), result.toBoolean(), infoElement.getProxifiedInput(), infoElement.getStamp(), rewireGuardFunction);
|
|
|
869 |
}
|
|
|
870 |
infoElement = nextElement(infoElement);
|
|
|
871 |
}
|
|
|
872 |
Pair<InfoElement, Stamp> foldResult = recursiveFoldStampFromInfo(value);
|
|
|
873 |
if (foldResult != null) {
|
|
|
874 |
TriState result = unaryLogicNode.tryFold(foldResult.getRight());
|
|
|
875 |
if (result.isKnown()) {
|
|
|
876 |
return rewireGuards(foldResult.getLeft().getGuard(), result.toBoolean(), foldResult.getLeft().getProxifiedInput(), foldResult.getRight(), rewireGuardFunction);
|
|
|
877 |
}
|
|
|
878 |
}
|
|
|
879 |
if (thisGuard != null) {
|
|
|
880 |
Stamp newStamp = unaryLogicNode.getSucceedingStampForValue(thisGuard.isNegated());
|
|
|
881 |
if (newStamp != null && foldPendingTest(thisGuard, value, newStamp, rewireGuardFunction)) {
|
|
|
882 |
return true;
|
|
|
883 |
}
|
|
|
884 |
|
|
|
885 |
}
|
|
|
886 |
} else if (node instanceof BinaryOpLogicNode) {
|
|
|
887 |
BinaryOpLogicNode binaryOpLogicNode = (BinaryOpLogicNode) node;
|
|
|
888 |
ValueNode x = binaryOpLogicNode.getX();
|
|
|
889 |
ValueNode y = binaryOpLogicNode.getY();
|
|
|
890 |
infoElement = getInfoElements(x);
|
|
|
891 |
while (infoElement != null) {
|
|
48190
|
892 |
TriState result = binaryOpLogicNode.tryFold(infoElement.getStamp(), y.stamp(NodeView.DEFAULT));
|
|
46459
|
893 |
if (result.isKnown()) {
|
|
|
894 |
return rewireGuards(infoElement.getGuard(), result.toBoolean(), infoElement.getProxifiedInput(), infoElement.getStamp(), rewireGuardFunction);
|
|
|
895 |
}
|
|
|
896 |
infoElement = nextElement(infoElement);
|
|
|
897 |
}
|
|
|
898 |
|
|
|
899 |
if (y.isConstant()) {
|
|
|
900 |
Pair<InfoElement, Stamp> foldResult = recursiveFoldStampFromInfo(x);
|
|
|
901 |
if (foldResult != null) {
|
|
48190
|
902 |
TriState result = binaryOpLogicNode.tryFold(foldResult.getRight(), y.stamp(NodeView.DEFAULT));
|
|
46459
|
903 |
if (result.isKnown()) {
|
|
|
904 |
return rewireGuards(foldResult.getLeft().getGuard(), result.toBoolean(), foldResult.getLeft().getProxifiedInput(), foldResult.getRight(), rewireGuardFunction);
|
|
|
905 |
}
|
|
|
906 |
}
|
|
|
907 |
} else {
|
|
|
908 |
infoElement = getInfoElements(y);
|
|
|
909 |
while (infoElement != null) {
|
|
48190
|
910 |
TriState result = binaryOpLogicNode.tryFold(x.stamp(NodeView.DEFAULT), infoElement.getStamp());
|
|
46459
|
911 |
if (result.isKnown()) {
|
|
|
912 |
return rewireGuards(infoElement.getGuard(), result.toBoolean(), infoElement.getProxifiedInput(), infoElement.getStamp(), rewireGuardFunction);
|
|
|
913 |
}
|
|
|
914 |
infoElement = nextElement(infoElement);
|
|
|
915 |
}
|
|
|
916 |
}
|
|
|
917 |
|
|
|
918 |
/*
|
|
|
919 |
* For complex expressions involving constants, see if it's possible to fold the
|
|
|
920 |
* tests by using stamps one level up in the expression. For instance, (x + n < y)
|
|
|
921 |
* might fold if something is known about x and all other values are constants. The
|
|
|
922 |
* reason for the constant restriction is that if more than 1 real value is involved
|
|
|
923 |
* the code might need to adopt multiple guards to have proper dependences.
|
|
|
924 |
*/
|
|
|
925 |
if (x instanceof BinaryArithmeticNode<?> && y.isConstant()) {
|
|
|
926 |
BinaryArithmeticNode<?> binary = (BinaryArithmeticNode<?>) x;
|
|
|
927 |
if (binary.getY().isConstant()) {
|
|
|
928 |
infoElement = getInfoElements(binary.getX());
|
|
|
929 |
while (infoElement != null) {
|
|
48190
|
930 |
Stamp newStampX = binary.foldStamp(infoElement.getStamp(), binary.getY().stamp(NodeView.DEFAULT));
|
|
|
931 |
TriState result = binaryOpLogicNode.tryFold(newStampX, y.stamp(NodeView.DEFAULT));
|
|
46459
|
932 |
if (result.isKnown()) {
|
|
|
933 |
return rewireGuards(infoElement.getGuard(), result.toBoolean(), infoElement.getProxifiedInput(), newStampX, rewireGuardFunction);
|
|
|
934 |
}
|
|
|
935 |
infoElement = nextElement(infoElement);
|
|
|
936 |
}
|
|
|
937 |
}
|
|
|
938 |
}
|
|
|
939 |
|
|
|
940 |
if (thisGuard != null && binaryOpLogicNode instanceof IntegerEqualsNode && !thisGuard.isNegated()) {
|
|
|
941 |
if (y.isConstant() && x instanceof AndNode) {
|
|
|
942 |
AndNode and = (AndNode) x;
|
|
|
943 |
if (and.getY() == y) {
|
|
|
944 |
/*
|
|
|
945 |
* This 'and' proves something about some of the bits in and.getX().
|
|
|
946 |
* It's equivalent to or'ing in the mask value since those values are
|
|
|
947 |
* known to be set.
|
|
|
948 |
*/
|
|
48190
|
949 |
BinaryOp<Or> op = ArithmeticOpTable.forStamp(x.stamp(NodeView.DEFAULT)).getOr();
|
|
46459
|
950 |
IntegerStamp newStampX = (IntegerStamp) op.foldStamp(getSafeStamp(and.getX()), getOtherSafeStamp(y));
|
|
|
951 |
if (foldPendingTest(thisGuard, and.getX(), newStampX, rewireGuardFunction)) {
|
|
|
952 |
return true;
|
|
|
953 |
}
|
|
|
954 |
}
|
|
|
955 |
}
|
|
|
956 |
}
|
|
|
957 |
|
|
|
958 |
if (thisGuard != null) {
|
|
|
959 |
if (!x.isConstant()) {
|
|
|
960 |
Stamp newStampX = binaryOpLogicNode.getSucceedingStampForX(thisGuard.isNegated(), getSafeStamp(x), getOtherSafeStamp(y));
|
|
|
961 |
if (newStampX != null && foldPendingTest(thisGuard, x, newStampX, rewireGuardFunction)) {
|
|
|
962 |
return true;
|
|
|
963 |
}
|
|
|
964 |
}
|
|
|
965 |
if (!y.isConstant()) {
|
|
|
966 |
Stamp newStampY = binaryOpLogicNode.getSucceedingStampForY(thisGuard.isNegated(), getOtherSafeStamp(x), getSafeStamp(y));
|
|
|
967 |
if (newStampY != null && foldPendingTest(thisGuard, y, newStampY, rewireGuardFunction)) {
|
|
|
968 |
return true;
|
|
|
969 |
}
|
|
|
970 |
}
|
|
|
971 |
}
|
|
|
972 |
} else if (node instanceof ShortCircuitOrNode) {
|
|
|
973 |
final ShortCircuitOrNode shortCircuitOrNode = (ShortCircuitOrNode) node;
|
|
|
974 |
return tryProveCondition(shortCircuitOrNode.getX(), (guard, result, guardedValueStamp, newInput) -> {
|
|
|
975 |
if (result == !shortCircuitOrNode.isXNegated()) {
|
|
|
976 |
return rewireGuards(guard, true, newInput, guardedValueStamp, rewireGuardFunction);
|
|
|
977 |
} else {
|
|
|
978 |
return tryProveCondition(shortCircuitOrNode.getY(), (innerGuard, innerResult, innerGuardedValueStamp, innerNewInput) -> {
|
|
|
979 |
ValueNode proxifiedInput = newInput;
|
|
|
980 |
if (proxifiedInput == null) {
|
|
|
981 |
proxifiedInput = innerNewInput;
|
|
|
982 |
} else if (innerNewInput != null) {
|
|
|
983 |
if (innerNewInput != newInput) {
|
|
|
984 |
// Cannot canonicalize due to different proxied inputs.
|
|
|
985 |
return false;
|
|
|
986 |
}
|
|
|
987 |
}
|
|
|
988 |
// Can only canonicalize if the guards are equal.
|
|
|
989 |
if (innerGuard == guard) {
|
|
|
990 |
return rewireGuards(guard, innerResult ^ shortCircuitOrNode.isYNegated(), proxifiedInput, guardedValueStamp, rewireGuardFunction);
|
|
|
991 |
}
|
|
|
992 |
return false;
|
|
|
993 |
});
|
|
|
994 |
}
|
|
|
995 |
});
|
|
|
996 |
}
|
|
|
997 |
|
|
|
998 |
return false;
|
|
|
999 |
}
|
|
|
1000 |
|
|
|
1001 |
protected void registerNewStamp(ValueNode maybeProxiedValue, Stamp newStamp, GuardingNode guard) {
|
|
50330
|
1002 |
registerNewStamp(maybeProxiedValue, newStamp, guard, false);
|
|
|
1003 |
}
|
|
|
1004 |
|
|
|
1005 |
protected void registerNewStamp(ValueNode maybeProxiedValue, Stamp newStamp, GuardingNode guard, boolean propagateThroughPis) {
|
|
46459
|
1006 |
assert maybeProxiedValue != null;
|
|
|
1007 |
assert guard != null;
|
|
50330
|
1008 |
|
|
|
1009 |
if (newStamp == null || newStamp.isUnrestricted()) {
|
|
|
1010 |
return;
|
|
|
1011 |
}
|
|
|
1012 |
|
|
|
1013 |
ValueNode value = maybeProxiedValue;
|
|
|
1014 |
Stamp stamp = newStamp;
|
|
|
1015 |
|
|
|
1016 |
while (stamp != null && value != null) {
|
|
46459
|
1017 |
ValueNode proxiedValue = null;
|
|
|
1018 |
if (value instanceof PiNode) {
|
|
|
1019 |
proxiedValue = value;
|
|
|
1020 |
}
|
|
50330
|
1021 |
counterStampsRegistered.increment(debug);
|
|
|
1022 |
debug.log("\t Saving stamp for node %s stamp %s guarded by %s", value, stamp, guard);
|
|
|
1023 |
assert value instanceof LogicNode || stamp.isCompatible(value.stamp(NodeView.DEFAULT)) : stamp + " vs. " + value.stamp(NodeView.DEFAULT) + " (" + value + ")";
|
|
|
1024 |
map.setAndGrow(value, new InfoElement(stamp, guard, proxiedValue, map.getAndGrow(value)));
|
|
|
1025 |
undoOperations.push(value);
|
|
|
1026 |
if (propagateThroughPis && value instanceof PiNode) {
|
|
|
1027 |
PiNode piNode = (PiNode) value;
|
|
|
1028 |
value = piNode.getOriginalNode();
|
|
|
1029 |
} else if (value instanceof StampInverter) {
|
|
|
1030 |
StampInverter stampInverter = (StampInverter) value;
|
|
|
1031 |
value = stampInverter.getValue();
|
|
|
1032 |
stamp = stampInverter.invertStamp(stamp);
|
|
|
1033 |
} else {
|
|
|
1034 |
break;
|
|
|
1035 |
}
|
|
46459
|
1036 |
}
|
|
|
1037 |
}
|
|
|
1038 |
|
|
|
1039 |
protected void processAbstractBegin(AbstractBeginNode beginNode) {
|
|
|
1040 |
Node predecessor = beginNode.predecessor();
|
|
|
1041 |
if (predecessor instanceof IfNode) {
|
|
|
1042 |
IfNode ifNode = (IfNode) predecessor;
|
|
|
1043 |
boolean negated = (ifNode.falseSuccessor() == beginNode);
|
|
|
1044 |
LogicNode condition = ifNode.condition();
|
|
|
1045 |
registerNewCondition(condition, negated, beginNode);
|
|
|
1046 |
} else if (predecessor instanceof TypeSwitchNode) {
|
|
|
1047 |
TypeSwitchNode typeSwitch = (TypeSwitchNode) predecessor;
|
|
|
1048 |
processTypeSwitch(beginNode, typeSwitch);
|
|
|
1049 |
} else if (predecessor instanceof IntegerSwitchNode) {
|
|
|
1050 |
IntegerSwitchNode integerSwitchNode = (IntegerSwitchNode) predecessor;
|
|
|
1051 |
processIntegerSwitch(beginNode, integerSwitchNode);
|
|
|
1052 |
}
|
|
|
1053 |
}
|
|
|
1054 |
|
|
|
1055 |
private static boolean maybeMultipleUsages(ValueNode value) {
|
|
|
1056 |
if (value.hasMoreThanOneUsage()) {
|
|
|
1057 |
return true;
|
|
|
1058 |
} else {
|
|
50330
|
1059 |
return value instanceof ProxyNode ||
|
|
|
1060 |
value instanceof PiNode ||
|
|
|
1061 |
value instanceof StampInverter;
|
|
46459
|
1062 |
}
|
|
|
1063 |
}
|
|
|
1064 |
|
|
|
1065 |
protected void processIntegerSwitch(AbstractBeginNode beginNode, IntegerSwitchNode integerSwitchNode) {
|
|
|
1066 |
ValueNode value = integerSwitchNode.value();
|
|
|
1067 |
if (maybeMultipleUsages(value)) {
|
|
|
1068 |
Stamp stamp = integerSwitchNode.getValueStampForSuccessor(beginNode);
|
|
|
1069 |
if (stamp != null) {
|
|
|
1070 |
registerNewStamp(value, stamp, beginNode);
|
|
|
1071 |
}
|
|
|
1072 |
}
|
|
|
1073 |
}
|
|
|
1074 |
|
|
|
1075 |
protected void processTypeSwitch(AbstractBeginNode beginNode, TypeSwitchNode typeSwitch) {
|
|
|
1076 |
ValueNode hub = typeSwitch.value();
|
|
|
1077 |
if (hub instanceof LoadHubNode) {
|
|
|
1078 |
LoadHubNode loadHub = (LoadHubNode) hub;
|
|
|
1079 |
ValueNode value = loadHub.getValue();
|
|
|
1080 |
if (maybeMultipleUsages(value)) {
|
|
|
1081 |
Stamp stamp = typeSwitch.getValueStampForSuccessor(beginNode);
|
|
|
1082 |
if (stamp != null) {
|
|
|
1083 |
registerNewStamp(value, stamp, beginNode);
|
|
|
1084 |
}
|
|
|
1085 |
}
|
|
|
1086 |
}
|
|
|
1087 |
}
|
|
|
1088 |
|
|
|
1089 |
@Override
|
|
50330
|
1090 |
public void exit(Block b, Marks marks) {
|
|
|
1091 |
int infoElementsMark = marks.infoElementOperations;
|
|
|
1092 |
while (undoOperations.size() > infoElementsMark) {
|
|
46459
|
1093 |
Node node = undoOperations.pop();
|
|
|
1094 |
if (node.isAlive()) {
|
|
|
1095 |
map.set(node, map.get(node).getParent());
|
|
|
1096 |
}
|
|
|
1097 |
}
|
|
50330
|
1098 |
|
|
|
1099 |
int conditionsMark = marks.conditions;
|
|
|
1100 |
while (conditions.size() > conditionsMark) {
|
|
|
1101 |
conditions.pop();
|
|
|
1102 |
}
|
|
46459
|
1103 |
}
|
|
|
1104 |
}
|
|
|
1105 |
|
|
|
1106 |
@FunctionalInterface
|
|
|
1107 |
protected interface InfoElementProvider {
|
|
|
1108 |
Iterable<InfoElement> getInfoElements(ValueNode value);
|
|
|
1109 |
}
|
|
|
1110 |
|
|
|
1111 |
/**
|
|
|
1112 |
* Checks for safe nodes when moving pending tests up.
|
|
|
1113 |
*/
|
|
|
1114 |
static class InputFilter extends Node.EdgeVisitor {
|
|
|
1115 |
boolean ok;
|
|
|
1116 |
private ValueNode value;
|
|
|
1117 |
|
|
|
1118 |
InputFilter(ValueNode value) {
|
|
|
1119 |
this.value = value;
|
|
|
1120 |
this.ok = true;
|
|
|
1121 |
}
|
|
|
1122 |
|
|
|
1123 |
@Override
|
|
|
1124 |
public Node apply(Node node, Node curNode) {
|
|
|
1125 |
if (!ok) {
|
|
|
1126 |
// Abort the recursion
|
|
|
1127 |
return curNode;
|
|
|
1128 |
}
|
|
|
1129 |
if (!(curNode instanceof ValueNode)) {
|
|
|
1130 |
ok = false;
|
|
|
1131 |
return curNode;
|
|
|
1132 |
}
|
|
|
1133 |
ValueNode curValue = (ValueNode) curNode;
|
|
|
1134 |
if (curValue.isConstant() || curValue == value || curValue instanceof ParameterNode) {
|
|
|
1135 |
return curNode;
|
|
|
1136 |
}
|
|
|
1137 |
if (curValue instanceof BinaryNode || curValue instanceof UnaryNode) {
|
|
|
1138 |
curValue.applyInputs(this);
|
|
|
1139 |
} else {
|
|
|
1140 |
ok = false;
|
|
|
1141 |
}
|
|
|
1142 |
return curNode;
|
|
|
1143 |
}
|
|
|
1144 |
}
|
|
|
1145 |
|
|
|
1146 |
@FunctionalInterface
|
|
|
1147 |
protected interface GuardRewirer {
|
|
|
1148 |
/**
|
|
|
1149 |
* Called if the condition could be proven to have a constant value ({@code result}) under
|
|
|
1150 |
* {@code guard}.
|
|
|
1151 |
*
|
|
|
1152 |
* @param guard the guard whose result is proven
|
|
|
1153 |
* @param result the known result of the guard
|
|
|
1154 |
* @param newInput new input to pi nodes depending on the new guard
|
|
|
1155 |
* @return whether the transformation could be applied
|
|
|
1156 |
*/
|
|
|
1157 |
boolean rewire(GuardingNode guard, boolean result, Stamp guardedValueStamp, ValueNode newInput);
|
|
|
1158 |
}
|
|
|
1159 |
|
|
|
1160 |
protected static final class InfoElement {
|
|
|
1161 |
private final Stamp stamp;
|
|
|
1162 |
private final GuardingNode guard;
|
|
|
1163 |
private final ValueNode proxifiedInput;
|
|
|
1164 |
private final InfoElement parent;
|
|
|
1165 |
|
|
|
1166 |
public InfoElement(Stamp stamp, GuardingNode guard, ValueNode proxifiedInput, InfoElement parent) {
|
|
|
1167 |
this.stamp = stamp;
|
|
|
1168 |
this.guard = guard;
|
|
|
1169 |
this.proxifiedInput = proxifiedInput;
|
|
|
1170 |
this.parent = parent;
|
|
|
1171 |
}
|
|
|
1172 |
|
|
|
1173 |
public InfoElement getParent() {
|
|
|
1174 |
return parent;
|
|
|
1175 |
}
|
|
|
1176 |
|
|
|
1177 |
public Stamp getStamp() {
|
|
|
1178 |
return stamp;
|
|
|
1179 |
}
|
|
|
1180 |
|
|
|
1181 |
public GuardingNode getGuard() {
|
|
|
1182 |
return guard;
|
|
|
1183 |
}
|
|
|
1184 |
|
|
|
1185 |
public ValueNode getProxifiedInput() {
|
|
|
1186 |
return proxifiedInput;
|
|
|
1187 |
}
|
|
|
1188 |
|
|
|
1189 |
@Override
|
|
|
1190 |
public String toString() {
|
|
|
1191 |
return stamp + " -> " + guard;
|
|
|
1192 |
}
|
|
|
1193 |
}
|
|
|
1194 |
|
|
|
1195 |
@Override
|
|
|
1196 |
public float codeSizeIncrease() {
|
|
|
1197 |
return 1.5f;
|
|
|
1198 |
}
|
|
|
1199 |
}
|