| /* |
| * Copyright (c) 2013, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package org.graalvm.compiler.phases.common; |
| |
| import org.graalvm.compiler.debug.GraalError; |
| import org.graalvm.compiler.graph.Graph; |
| import org.graalvm.compiler.graph.Node; |
| import org.graalvm.compiler.nodes.AbstractBeginNode; |
| import org.graalvm.compiler.nodes.AbstractMergeNode; |
| import org.graalvm.compiler.nodes.BeginNode; |
| import org.graalvm.compiler.nodes.EndNode; |
| import org.graalvm.compiler.nodes.IfNode; |
| import org.graalvm.compiler.nodes.LogicNode; |
| import org.graalvm.compiler.nodes.MergeNode; |
| import org.graalvm.compiler.nodes.ShortCircuitOrNode; |
| import org.graalvm.compiler.nodes.StructuredGraph; |
| import org.graalvm.compiler.nodes.ValueNode; |
| import org.graalvm.compiler.nodes.calc.ConditionalNode; |
| import org.graalvm.compiler.phases.Phase; |
| |
| public class ExpandLogicPhase extends Phase { |
| |
| @Override |
| protected void run(StructuredGraph graph) { |
| for (ShortCircuitOrNode logic : graph.getNodes(ShortCircuitOrNode.TYPE)) { |
| processBinary(logic); |
| } |
| assert graph.getNodes(ShortCircuitOrNode.TYPE).isEmpty(); |
| } |
| |
| private static void processBinary(ShortCircuitOrNode binary) { |
| while (binary.usages().isNotEmpty()) { |
| Node usage = binary.usages().first(); |
| if (usage instanceof ShortCircuitOrNode) { |
| processBinary((ShortCircuitOrNode) usage); |
| } else if (usage instanceof IfNode) { |
| processIf(binary.getX(), binary.isXNegated(), binary.getY(), binary.isYNegated(), (IfNode) usage, binary.getShortCircuitProbability()); |
| } else if (usage instanceof ConditionalNode) { |
| processConditional(binary.getX(), binary.isXNegated(), binary.getY(), binary.isYNegated(), (ConditionalNode) usage); |
| } else { |
| throw GraalError.shouldNotReachHere(); |
| } |
| } |
| binary.safeDelete(); |
| } |
| |
| private static void processIf(LogicNode x, boolean xNegated, LogicNode y, boolean yNegated, IfNode ifNode, double shortCircuitProbability) { |
| AbstractBeginNode trueTarget = ifNode.trueSuccessor(); |
| AbstractBeginNode falseTarget = ifNode.falseSuccessor(); |
| double firstIfProbability = shortCircuitProbability; |
| /* |
| * P(Y | not(X)) = P(Y inter not(X)) / P(not(X)) = (P(X union Y) - P(X)) / (1 - P(X)) |
| * |
| * P(X) = shortCircuitProbability |
| * |
| * P(X union Y) = ifNode.probability(trueTarget) |
| */ |
| double secondIfProbability = (ifNode.probability(trueTarget) - shortCircuitProbability) / (1 - shortCircuitProbability); |
| secondIfProbability = Math.min(1.0, Math.max(0.0, secondIfProbability)); |
| if (Double.isNaN(secondIfProbability)) { |
| secondIfProbability = 0.5; |
| } |
| ifNode.clearSuccessors(); |
| Graph graph = ifNode.graph(); |
| AbstractMergeNode trueTargetMerge = graph.add(new MergeNode()); |
| trueTargetMerge.setNext(trueTarget); |
| EndNode firstTrueEnd = graph.add(new EndNode()); |
| EndNode secondTrueEnd = graph.add(new EndNode()); |
| trueTargetMerge.addForwardEnd(firstTrueEnd); |
| trueTargetMerge.addForwardEnd(secondTrueEnd); |
| AbstractBeginNode firstTrueTarget = BeginNode.begin(firstTrueEnd); |
| AbstractBeginNode secondTrueTarget = BeginNode.begin(secondTrueEnd); |
| AbstractBeginNode secondIf = BeginNode.begin(graph.add(new IfNode(y, yNegated ? falseTarget : secondTrueTarget, yNegated ? secondTrueTarget : falseTarget, secondIfProbability))); |
| IfNode firstIf = graph.add(new IfNode(x, xNegated ? secondIf : firstTrueTarget, xNegated ? firstTrueTarget : secondIf, firstIfProbability)); |
| ifNode.replaceAtPredecessor(firstIf); |
| ifNode.safeDelete(); |
| } |
| |
| private static void processConditional(LogicNode x, boolean xNegated, LogicNode y, boolean yNegated, ConditionalNode conditional) { |
| ValueNode trueTarget = conditional.trueValue(); |
| ValueNode falseTarget = conditional.falseValue(); |
| Graph graph = conditional.graph(); |
| ConditionalNode secondConditional = graph.unique(new ConditionalNode(y, yNegated ? falseTarget : trueTarget, yNegated ? trueTarget : falseTarget)); |
| ConditionalNode firstConditional = graph.unique(new ConditionalNode(x, xNegated ? secondConditional : trueTarget, xNegated ? trueTarget : secondConditional)); |
| conditional.replaceAndDelete(firstConditional); |
| } |
| |
| @Override |
| public boolean checkContract() { |
| return false; |
| } |
| } |