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annotate graal/com.oracle.graal.phases/src/com/oracle/graal/phases/graph/ComputeProbabilityClosure.java @ 9957:1b33ef6544b4

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Fixed a warning.
author Christian Haeubl <haeubl@ssw.jku.at>
date Mon, 10 Jun 2013 09:30:32 +0200
parents de73bbbde021
children 053b837d0d7d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.phases.graph;
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24
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25 import java.util.*;
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26
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27 import com.oracle.graal.graph.*;
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28 import com.oracle.graal.nodes.*;
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29 import com.oracle.graal.nodes.util.*;
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30
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31 /**
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32 * Computes probabilities for nodes in a graph.
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33 * <p>
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34 * The computation of absolute probabilities works in three steps:
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35 * <ol>
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36 * <li>{@link PropagateProbability} traverses the graph in post order (merges after their ends, ...)
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37 * and keeps track of the "probability state". Whenever it encounters a {@link ControlSplitNode} it
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38 * uses the split's probability information to divide the probability upon the successors. Whenever
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39 * it encounters an {@link Invoke} it assumes that the exception edge is unlikely and propagates the
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40 * whole probability to the normal successor. Whenever it encounters a {@link MergeNode} it sums up
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41 * the probability of all predecessors. It also maintains a set of active loops (whose
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42 * {@link LoopBeginNode} has been visited) and builds def/use information for step 2.</li>
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43 * <li></li>
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44 * <li>{@link PropagateLoopFrequency} propagates the loop frequencies and multiplies each
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45 * {@link FixedNode}'s probability with its loop frequency.</li>
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46 * </ol>
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47 * TODO: add exception probability information to Invokes
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48 */
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49 public class ComputeProbabilityClosure {
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50
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51 private static final double EPSILON = 1d / Integer.MAX_VALUE;
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52
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53 private final StructuredGraph graph;
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54 private final NodesToDoubles nodeProbabilities;
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55 private final Set<LoopInfo> loopInfos;
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56 private final Map<MergeNode, Set<LoopInfo>> mergeLoops;
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57
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58 public ComputeProbabilityClosure(StructuredGraph graph) {
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59 this.graph = graph;
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60 this.nodeProbabilities = new NodesToDoubles(graph.getNodeCount());
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61 this.loopInfos = new HashSet<>();
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62 this.mergeLoops = new IdentityHashMap<>();
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63 }
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64
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65 public NodesToDoubles apply() {
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66 new PropagateProbability(graph.start()).apply();
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67 computeLoopFactors();
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68 new PropagateLoopFrequency(graph.start()).apply();
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69 return nodeProbabilities;
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70 }
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71
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72 private void computeLoopFactors() {
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73 for (LoopInfo info : loopInfos) {
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74 double frequency = info.loopFrequency(nodeProbabilities);
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75 assert frequency != -1;
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76 }
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77 }
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78
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79 public static class LoopInfo {
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80
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81 public final LoopBeginNode loopBegin;
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82
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83 public final NodeMap<Set<LoopInfo>> requires;
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84
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85 private double loopFrequency = -1;
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86 public boolean ended = false;
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87
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88 public LoopInfo(LoopBeginNode loopBegin) {
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89 this.loopBegin = loopBegin;
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90 this.requires = loopBegin.graph().createNodeMap();
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91 }
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92
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93 public double loopFrequency(NodesToDoubles nodeProbabilities) {
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94 if (loopFrequency == -1 && ended) {
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95 double backEdgeProb = 0.0;
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96 for (LoopEndNode le : loopBegin.loopEnds()) {
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97 double factor = 1;
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98 Set<LoopInfo> requireds = requires.get(le);
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99 for (LoopInfo required : requireds) {
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100 double t = required.loopFrequency(nodeProbabilities);
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101 if (t == -1) {
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102 return -1;
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103 }
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104 factor *= t;
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105 }
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106 backEdgeProb += nodeProbabilities.get(le) * factor;
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107 }
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108 double d = nodeProbabilities.get(loopBegin) - backEdgeProb;
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109 if (d < EPSILON) {
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110 d = EPSILON;
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111 }
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112 loopFrequency = nodeProbabilities.get(loopBegin) / d;
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113 loopBegin.setLoopFrequency(loopFrequency);
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114 }
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115 return loopFrequency;
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116 }
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117 }
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118
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119 private class Probability implements MergeableState<Probability> {
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120
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121 public double probability;
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122 public HashSet<LoopInfo> loops;
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123 public LoopInfo loopInfo;
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124
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125 public Probability(double probability, HashSet<LoopInfo> loops) {
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126 assert probability >= 0.0;
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127 this.probability = probability;
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128 this.loops = new HashSet<>(4);
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129 if (loops != null) {
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130 this.loops.addAll(loops);
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131 }
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132 }
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parents:
diff changeset
133
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
134 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
135 public Probability clone() {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
136 return new Probability(probability, loops);
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
137 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
138
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
139 @Override
5074
ad00d1d02ed2 change MergeableState to use List<T> instead of Collection<T>
Lukas Stadler <lukas.stadler@jku.at>
parents: 5061
diff changeset
140 public boolean merge(MergeNode merge, List<Probability> withStates) {
4614
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
141 if (merge.forwardEndCount() > 1) {
4142
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
142 HashSet<LoopInfo> intersection = new HashSet<>(loops);
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
143 for (Probability other : withStates) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
144 intersection.retainAll(other.loops);
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
145 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
146 for (LoopInfo info : loops) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
147 if (!intersection.contains(info)) {
9234
b9cf7d0b598e removal of FixedNode.probability (draft)
Christian Haeubl <haeubl@ssw.jku.at>
parents: 9113
diff changeset
148 double loopFrequency = info.loopFrequency(nodeProbabilities);
3733
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parents:
diff changeset
149 if (loopFrequency == -1) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
150 return false;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
151 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
152 probability *= loopFrequency;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
153 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
154 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
155 for (Probability other : withStates) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
156 double prob = other.probability;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
157 for (LoopInfo info : other.loops) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
158 if (!intersection.contains(info)) {
9234
b9cf7d0b598e removal of FixedNode.probability (draft)
Christian Haeubl <haeubl@ssw.jku.at>
parents: 9113
diff changeset
159 double loopFrequency = info.loopFrequency(nodeProbabilities);
3733
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
160 if (loopFrequency == -1) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
161 return false;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
162 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
163 prob *= loopFrequency;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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164 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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165 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
166 probability += prob;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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167 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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168 loops = intersection;
4142
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
169 mergeLoops.put(merge, new HashSet<>(intersection));
9467
3531cdfddff6 Ensure probabilities are never negative. Add additional assertions.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
170 probability = Math.max(0.0, probability);
3733
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
171 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
172 return true;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
173 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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174
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
175 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
176 public void loopBegin(LoopBeginNode loopBegin) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
177 loopInfo = new LoopInfo(loopBegin);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
178 loopInfos.add(loopInfo);
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
179 loops.add(loopInfo);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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180 }
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parents:
diff changeset
181
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
182 @Override
5074
ad00d1d02ed2 change MergeableState to use List<T> instead of Collection<T>
Lukas Stadler <lukas.stadler@jku.at>
parents: 5061
diff changeset
183 public void loopEnds(LoopBeginNode loopBegin, List<Probability> loopEndStates) {
3733
e233f5660da4 Added Java files from Maxine project.
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parents:
diff changeset
184 assert loopInfo != null;
4614
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
185 List<LoopEndNode> loopEnds = loopBegin.orderedLoopEnds();
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
186 int i = 0;
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
187 for (Probability proba : loopEndStates) {
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
188 LoopEndNode loopEnd = loopEnds.get(i++);
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
189 Set<LoopInfo> requires = loopInfo.requires.get(loopEnd);
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
190 if (requires == null) {
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
191 requires = new HashSet<>();
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
192 loopInfo.requires.set(loopEnd, requires);
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
193 }
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
194 for (LoopInfo innerLoop : proba.loops) {
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
195 if (innerLoop != loopInfo && !this.loops.contains(innerLoop)) {
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
196 requires.add(innerLoop);
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
197 }
3733
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parents:
diff changeset
198 }
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parents:
diff changeset
199 }
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parents:
diff changeset
200 loopInfo.ended = true;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
201 }
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parents:
diff changeset
202
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parents:
diff changeset
203 @Override
9436
ae815a4c112a Rename BeginNode => AbstractBeginNode and make abstract. Introduce concrete subclass BeginNode.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9238
diff changeset
204 public void afterSplit(AbstractBeginNode node) {
3733
e233f5660da4 Added Java files from Maxine project.
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parents:
diff changeset
205 assert node.predecessor() != null;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
206 Node pred = node.predecessor();
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
207 if (pred instanceof Invoke) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
208 Invoke x = (Invoke) pred;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
209 if (x.next() != node) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
210 probability = 0;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
211 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
212 } else {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
213 assert pred instanceof ControlSplitNode;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
214 ControlSplitNode x = (ControlSplitNode) pred;
9467
3531cdfddff6 Ensure probabilities are never negative. Add additional assertions.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
215 double nodeProbability = x.probability(node);
3531cdfddff6 Ensure probabilities are never negative. Add additional assertions.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
216 assert nodeProbability >= 0.0 : "Node " + x + " provided negative probability for begin " + node + ": " + nodeProbability;
3531cdfddff6 Ensure probabilities are never negative. Add additional assertions.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
217 probability *= nodeProbability;
3531cdfddff6 Ensure probabilities are never negative. Add additional assertions.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9436
diff changeset
218 assert probability >= 0.0;
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
219 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
220 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
221 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
222
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
223 private class PropagateProbability extends PostOrderNodeIterator<Probability> {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
224
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
225 public PropagateProbability(FixedNode start) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
226 super(start, new Probability(1d, null));
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
227 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
228
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
229 @Override
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
230 protected void node(FixedNode node) {
9238
8f01fe16e473 refactorings and cleanups for the removal of FixedNode.probability
Christian Haeubl <haeubl@ssw.jku.at>
parents: 9234
diff changeset
231 nodeProbabilities.put(node, state.probability);
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
232 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
233 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
234
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
235 private class LoopCount implements MergeableState<LoopCount> {
7530
5e3d1a68664e applied mx eclipseformat to all Java files
Doug Simon <doug.simon@oracle.com>
parents: 7522
diff changeset
236
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
237 public double count;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
238
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
239 public LoopCount(double count) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
240 this.count = count;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
241 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
242
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
243 @Override
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
244 public LoopCount clone() {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
245 return new LoopCount(count);
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
246 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
247
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
248 @Override
5074
ad00d1d02ed2 change MergeableState to use List<T> instead of Collection<T>
Lukas Stadler <lukas.stadler@jku.at>
parents: 5061
diff changeset
249 public boolean merge(MergeNode merge, List<LoopCount> withStates) {
4614
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
250 assert merge.forwardEndCount() == withStates.size() + 1;
a3882fd1ae61 Make it possible to have multiple LoopEnds per LoopBegin
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 4569
diff changeset
251 if (merge.forwardEndCount() > 1) {
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
252 Set<LoopInfo> loops = mergeLoops.get(merge);
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
253 assert loops != null;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
254 double countProd = 1;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
255 for (LoopInfo loop : loops) {
9234
b9cf7d0b598e removal of FixedNode.probability (draft)
Christian Haeubl <haeubl@ssw.jku.at>
parents: 9113
diff changeset
256 countProd *= loop.loopFrequency(nodeProbabilities);
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
257 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
258 count = countProd;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
259 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
260 return true;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
261 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
262
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
263 @Override
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
264 public void loopBegin(LoopBeginNode loopBegin) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
265 count *= loopBegin.loopFrequency();
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
266 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
267
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
268 @Override
5074
ad00d1d02ed2 change MergeableState to use List<T> instead of Collection<T>
Lukas Stadler <lukas.stadler@jku.at>
parents: 5061
diff changeset
269 public void loopEnds(LoopBeginNode loopBegin, List<LoopCount> loopEndStates) {
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
270 // nothing to do...
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
271 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
272
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
273 @Override
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274 public void afterSplit(AbstractBeginNode node) {
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275 // nothing to do...
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276 }
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277 }
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278
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279 private class PropagateLoopFrequency extends PostOrderNodeIterator<LoopCount> {
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280
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281 public PropagateLoopFrequency(FixedNode start) {
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282 super(start, new LoopCount(1d));
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283 }
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284
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285 @Override
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286 protected void node(FixedNode node) {
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287 nodeProbabilities.put(node, nodeProbabilities.get(node) * state.count);
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288 }
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289
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290 }
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291 }