--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.phases.common/src/org/graalvm/compiler/phases/common/ExpandLogicPhase.java Thu Feb 16 15:46:09 2017 -0800
@@ -0,0 +1,112 @@
+/*
+ * 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;
+ }
+}