Mercurial > hg > truffle
annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/TailDuplicationPhase.java @ 15006:e60ea0bf468d
remove StampFactory.dependency/extension/condition
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Mon, 07 Apr 2014 11:32:08 +0200 |
parents | 27c04ee36dcb |
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1 /* |
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2 * Copyright (c) 2012, 2013, 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.common; |
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24 |
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25 import static com.oracle.graal.phases.GraalOptions.*; |
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26 |
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27 import java.util.*; |
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28 |
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29 import com.oracle.graal.debug.*; |
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30 import com.oracle.graal.graph.Graph.DuplicationReplacement; |
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31 import com.oracle.graal.graph.Graph.Mark; |
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32 import com.oracle.graal.graph.*; |
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33 import com.oracle.graal.graph.NodeClass.NodeClassIterator; |
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34 import com.oracle.graal.graph.NodeClass.Position; |
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35 import com.oracle.graal.nodes.*; |
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36 import com.oracle.graal.nodes.VirtualState.NodeClosure; |
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37 import com.oracle.graal.nodes.extended.*; |
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38 import com.oracle.graal.nodes.java.*; |
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39 import com.oracle.graal.nodes.spi.*; |
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40 import com.oracle.graal.nodes.type.*; |
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41 import com.oracle.graal.nodes.util.*; |
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42 import com.oracle.graal.nodes.virtual.*; |
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43 import com.oracle.graal.phases.*; |
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44 import com.oracle.graal.phases.graph.*; |
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45 import com.oracle.graal.phases.tiers.*; |
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46 |
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47 /** |
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48 * This class is a phase that looks for opportunities for tail duplication. The static method |
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49 * {@link #tailDuplicate(MergeNode, TailDuplicationDecision, List, PhaseContext, CanonicalizerPhase)} |
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50 * can also be used to drive tail duplication from other places, e.g., inlining. |
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51 */ |
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52 public class TailDuplicationPhase extends BasePhase<PhaseContext> { |
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53 |
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54 /* |
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55 * Various metrics on the circumstances in which tail duplication was/wasn't performed. |
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56 */ |
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57 private static final DebugMetric metricDuplicationConsidered = Debug.metric("DuplicationConsidered"); |
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58 private static final DebugMetric metricDuplicationPerformed = Debug.metric("DuplicationPerformed"); |
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59 |
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60 private final CanonicalizerPhase canonicalizer; |
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61 |
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63 public DummyAnchorNode() { | |
64 super(StampFactory.forVoid()); | |
65 } | |
66 } | |
67 | |
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68 /** |
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69 * This interface is used by tail duplication to let clients decide if tail duplication should |
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70 * be performed. |
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71 */ |
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72 public interface TailDuplicationDecision { |
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73 |
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74 /** |
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75 * Queries if tail duplication should be performed at the given merge. If this method |
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76 * returns true then the tail duplication will be performed, because all other checks have |
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77 * happened before. |
15001 | 78 * |
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79 * @param merge The merge at which tail duplication can be performed. |
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80 * @param fixedNodeCount The size of the set of fixed nodes that forms the base for the |
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81 * duplicated set of nodes. |
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82 * @return true if the tail duplication should be performed, false otherwise. |
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83 */ |
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84 boolean doTransform(MergeNode merge, int fixedNodeCount); |
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85 } |
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86 |
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87 /** |
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88 * A tail duplication decision closure that employs the default algorithm: Check if there are |
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89 * any phis on the merge whose stamps improve and that have usages within the duplicated set of |
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90 * fixed nodes. |
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91 */ |
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92 public static final TailDuplicationDecision DEFAULT_DECISION = new TailDuplicationDecision() { |
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93 |
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94 public boolean doTransform(MergeNode merge, int fixedNodeCount) { |
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95 if (fixedNodeCount < TailDuplicationTrivialSize.getValue()) { |
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96 return true; |
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97 } |
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98 ArrayList<PhiNode> improvements = null; |
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99 for (PhiNode phi : merge.phis()) { |
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100 Stamp phiStamp = phi.stamp(); |
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101 for (ValueNode input : phi.values()) { |
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102 if (!input.stamp().equals(phiStamp)) { |
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103 if (improvements == null) { |
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104 improvements = new ArrayList<>(); |
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105 } |
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106 if (!improvements.contains(phi)) { |
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107 improvements.add(phi); |
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108 } |
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109 break; |
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110 } |
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111 } |
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112 } |
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113 if (improvements == null) { |
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114 return false; |
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115 } |
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116 FixedNode current = merge; |
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117 int opportunities = 0; |
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118 while (current instanceof FixedWithNextNode) { |
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119 current = ((FixedWithNextNode) current).next(); |
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120 if (current instanceof VirtualizableAllocation) { |
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121 return false; |
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122 } |
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123 for (PhiNode phi : improvements) { |
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124 for (Node input : current.inputs()) { |
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125 if (input == phi) { |
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126 opportunities++; |
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127 } |
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128 if (input.inputs().contains(phi)) { |
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129 opportunities++; |
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130 } |
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131 } |
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132 } |
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133 } |
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134 return opportunities > 0; |
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135 } |
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136 }; |
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137 |
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138 /** |
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139 * A tail duplication decision closure that always returns true. |
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140 */ |
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141 public static final TailDuplicationDecision TRUE_DECISION = new TailDuplicationDecision() { |
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142 |
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143 @Override |
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144 public boolean doTransform(MergeNode merge, int fixedNodeCount) { |
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145 return true; |
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146 } |
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147 }; |
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148 |
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149 public TailDuplicationPhase(CanonicalizerPhase canonicalizer) { |
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150 this.canonicalizer = canonicalizer; |
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151 } |
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152 |
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153 @Override |
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154 protected void run(StructuredGraph graph, PhaseContext phaseContext) { |
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155 NodesToDoubles nodeProbabilities = new ComputeProbabilityClosure(graph).apply(); |
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156 |
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157 // A snapshot is taken here, so that new MergeNode instances aren't considered for tail |
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158 // duplication. |
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159 for (MergeNode merge : graph.getNodes(MergeNode.class).snapshot()) { |
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160 if (!(merge instanceof LoopBeginNode) && nodeProbabilities.get(merge) >= TailDuplicationProbability.getValue()) { |
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161 tailDuplicate(merge, DEFAULT_DECISION, null, phaseContext, canonicalizer); |
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162 } |
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163 } |
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164 } |
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165 |
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166 /** |
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167 * This method attempts to duplicate the tail of the given merge. The merge must not be a |
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168 * {@link LoopBeginNode}. If the merge is eligible for duplication (at least one fixed node in |
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169 * its tail, no {@link MonitorEnterNode}/ {@link MonitorExitNode}, non-null |
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170 * {@link MergeNode#stateAfter()}) then the decision callback is used to determine whether the |
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171 * tail duplication should actually be performed. If replacements is non-null, then this list of |
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172 * {@link PiNode}s is used to replace one value per merge end. |
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174 * @param merge The merge whose tail should be duplicated. |
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175 * @param decision A callback that can make the final decision if tail duplication should occur |
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176 * or not. |
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177 * @param replacements A list of {@link PiNode}s, or null. If this list is non-null then its |
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178 * size needs to match the merge's end count. Each entry can either be null or a |
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179 * {@link PiNode}, and is used to replace {@link PiNode#object()} with the |
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180 * {@link PiNode} in the duplicated branch that corresponds to the entry. |
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181 * @param phaseContext |
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182 */ |
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183 public static boolean tailDuplicate(MergeNode merge, TailDuplicationDecision decision, List<GuardedValueNode> replacements, PhaseContext phaseContext, CanonicalizerPhase canonicalizer) { |
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184 assert !(merge instanceof LoopBeginNode); |
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185 assert replacements == null || replacements.size() == merge.forwardEndCount(); |
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186 FixedNode fixed = merge; |
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187 int fixedCount = 0; |
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188 while (fixed instanceof FixedWithNextNode) { |
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189 fixed = ((FixedWithNextNode) fixed).next(); |
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190 if (fixed instanceof CommitAllocationNode) { |
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191 return false; |
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192 } |
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193 fixedCount++; |
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194 } |
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195 if (fixedCount > 1) { |
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196 metricDuplicationConsidered.increment(); |
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197 if (decision.doTransform(merge, fixedCount)) { |
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198 metricDuplicationPerformed.increment(); |
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199 new DuplicationOperation(merge, replacements, canonicalizer).duplicate(phaseContext); |
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200 return true; |
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201 } |
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202 } |
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203 return false; |
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204 } |
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205 |
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206 /** |
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207 * This class encapsulates one tail duplication operation on a specific {@link MergeNode}. |
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208 */ |
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209 private static class DuplicationOperation { |
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210 |
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211 private final MergeNode merge; |
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212 private final StructuredGraph graph; |
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213 |
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214 private final HashMap<ValueNode, PhiNode> bottomPhis = new HashMap<>(); |
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215 private final List<GuardedValueNode> replacements; |
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216 |
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217 private final CanonicalizerPhase canonicalizer; |
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218 |
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219 /** |
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220 * Initializes the tail duplication operation without actually performing any work. |
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222 * @param merge The merge whose tail should be duplicated. |
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223 * @param replacements A list of replacement {@link PiNode}s, or null. If this is non-null, |
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224 * then the size of the list needs to match the number of end nodes at the merge. |
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225 */ |
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226 public DuplicationOperation(MergeNode merge, List<GuardedValueNode> replacements, CanonicalizerPhase canonicalizer) { |
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227 this.merge = merge; |
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228 this.replacements = replacements; |
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229 this.graph = merge.graph(); |
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230 this.canonicalizer = canonicalizer; |
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231 } |
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232 |
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233 /** |
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234 * Performs the actual tail duplication: |
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235 * <ul> |
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236 * <li>Creates a new {@link ValueAnchorNode} at the beginning of the duplicated area, an |
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237 * transfers all dependencies from the merge to this anchor.</li> |
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238 * <li>Determines the set of fixed nodes to be duplicated.</li> |
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239 * <li>Creates the new merge at the bottom of the duplicated area.</li> |
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240 * <li>Determines the complete set of duplicated nodes.</li> |
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241 * <li>Performs the actual duplication.</li> |
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242 * </ul> |
15001 | 243 * |
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244 * @param phaseContext |
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245 */ |
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246 private void duplicate(PhaseContext phaseContext) { |
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247 Debug.log("tail duplication at merge %s in %s", merge, graph.method()); |
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248 |
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249 Mark startMark = graph.getMark(); |
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250 |
15001 | 251 DummyAnchorNode anchor = addValueAnchor(); |
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252 |
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253 // determine the fixed nodes that should be duplicated (currently: all nodes up until |
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254 // the first control |
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255 // split, end node, deopt or return. |
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256 ArrayList<FixedNode> fixedNodes = new ArrayList<>(); |
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257 FixedNode fixed = merge.next(); |
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258 FrameState stateAfter = merge.stateAfter(); |
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259 while (fixed instanceof FixedWithNextNode) { |
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260 fixedNodes.add(fixed); |
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261 if (fixed instanceof StateSplit && ((StateSplit) fixed).stateAfter() != null) { |
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262 stateAfter = ((StateSplit) fixed).stateAfter(); |
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263 } |
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264 fixed = ((FixedWithNextNode) fixed).next(); |
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265 } |
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266 |
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267 AbstractEndNode endAfter = createNewMerge(fixed, stateAfter); |
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268 MergeNode mergeAfter = endAfter.merge(); |
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269 fixedNodes.add(endAfter); |
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270 final HashSet<Node> duplicatedNodes = buildDuplicatedNodeSet(fixedNodes, stateAfter); |
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271 mergeAfter.clearEnds(); |
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272 expandDuplicated(duplicatedNodes, mergeAfter); |
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273 |
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274 List<AbstractEndNode> endSnapshot = merge.forwardEnds().snapshot(); |
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275 List<PhiNode> phiSnapshot = merge.phis().snapshot(); |
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276 |
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277 int endIndex = 0; |
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278 for (final AbstractEndNode forwardEnd : merge.forwardEnds()) { |
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279 Map<Node, Node> duplicates; |
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280 if (replacements == null || replacements.get(endIndex) == null) { |
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281 duplicates = graph.addDuplicates(duplicatedNodes, graph, duplicatedNodes.size(), (DuplicationReplacement) null); |
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282 } else { |
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283 HashMap<Node, Node> replace = new HashMap<>(); |
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284 replace.put(replacements.get(endIndex).object(), replacements.get(endIndex)); |
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285 duplicates = graph.addDuplicates(duplicatedNodes, graph, duplicatedNodes.size(), replace); |
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286 } |
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287 for (Map.Entry<ValueNode, PhiNode> phi : bottomPhis.entrySet()) { |
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288 phi.getValue().initializeValueAt(merge.forwardEndIndex(forwardEnd), (ValueNode) duplicates.get(phi.getKey())); |
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289 } |
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290 mergeAfter.addForwardEnd((AbstractEndNode) duplicates.get(endAfter)); |
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291 |
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292 // re-wire the duplicated ValueAnchorNode to the predecessor of the corresponding |
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293 // EndNode |
15001 | 294 FixedWithNextNode anchorDuplicate = (FixedWithNextNode) duplicates.get(anchor); |
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295 // move dependencies on the ValueAnchorNode to the previous BeginNode |
15001 | 296 AbstractBeginNode prevBegin = AbstractBeginNode.prevBegin(forwardEnd); |
297 anchorDuplicate.replaceAtUsages(InputType.Guard, prevBegin); | |
298 anchorDuplicate.replaceAtUsages(InputType.Anchor, prevBegin); | |
299 assert anchorDuplicate.usages().isEmpty(); | |
300 | |
301 FixedNode next = anchorDuplicate.next(); | |
302 anchorDuplicate.setNext(null); | |
303 ((FixedWithNextNode) forwardEnd.predecessor()).setNext(next); | |
304 anchorDuplicate.safeDelete(); | |
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305 |
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306 // re-wire the phi duplicates to the correct input |
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307 for (PhiNode phi : phiSnapshot) { |
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308 PhiNode phiDuplicate = (PhiNode) duplicates.get(phi); |
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309 phiDuplicate.replaceAtUsages(phi.valueAt(forwardEnd)); |
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310 phiDuplicate.safeDelete(); |
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311 } |
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312 endIndex++; |
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313 } |
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314 GraphUtil.killCFG(merge); |
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315 for (AbstractEndNode forwardEnd : endSnapshot) { |
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316 forwardEnd.safeDelete(); |
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317 } |
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318 for (PhiNode phi : phiSnapshot) { |
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319 // these phis should go away, but they still need to be anchored to a merge to be |
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320 // valid... |
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321 if (phi.isAlive()) { |
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322 phi.setMerge(mergeAfter); |
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323 } |
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324 } |
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325 canonicalizer.applyIncremental(graph, phaseContext, startMark); |
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326 Debug.dump(graph, "After tail duplication at %s", merge); |
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327 } |
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328 |
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329 /** |
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330 * Inserts a new ValueAnchorNode after the merge and transfers all dependency-usages (not |
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331 * phis) to this ValueAnchorNode. |
15001 | 332 * |
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333 * @return The new {@link ValueAnchorNode} that was created. |
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334 */ |
15001 | 335 private DummyAnchorNode addValueAnchor() { |
336 DummyAnchorNode anchor = graph.add(new DummyAnchorNode()); | |
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337 graph.addAfterFixed(merge, anchor); |
15001 | 338 merge.replaceAtUsages(InputType.Guard, anchor); |
339 merge.replaceAtUsages(InputType.Anchor, anchor); | |
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340 return anchor; |
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341 } |
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342 |
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343 /** |
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344 * Given a set of fixed nodes, this method determines the set of fixed and floating nodes |
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345 * that needs to be duplicated, i.e., all nodes that due to data flow and other dependencies |
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346 * needs to be duplicated. |
15001 | 347 * |
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348 * @param fixedNodes The set of fixed nodes that should be duplicated. |
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349 * @param stateAfter The frame state of the merge that follows the set of fixed nodes. All |
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350 * {@link ValueNode}s reachable from this state are considered to be reachable |
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351 * from within the duplicated set of nodes. |
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352 * @return The set of nodes that need to be duplicated. |
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353 */ |
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354 private HashSet<Node> buildDuplicatedNodeSet(final ArrayList<FixedNode> fixedNodes, FrameState stateAfter) { |
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355 final NodeBitMap aboveBound = graph.createNodeBitMap(); |
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356 final NodeBitMap belowBound = graph.createNodeBitMap(); |
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357 |
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358 final Deque<Node> worklist = new ArrayDeque<>(); |
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359 |
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360 // Build the set of nodes that have (transitive) usages within the duplicatedNodes. |
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361 // This is achieved by iterating all nodes that are reachable via inputs from the the |
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362 // fixed nodes. |
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363 aboveBound.markAll(fixedNodes); |
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364 worklist.addAll(fixedNodes); |
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365 |
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366 // the phis at the original merge should always be duplicated |
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367 for (PhiNode phi : merge.phis()) { |
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368 aboveBound.mark(phi); |
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369 worklist.add(phi); |
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370 } |
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371 |
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372 NodeClosure<Node> aboveClosure = new NodeClosure<Node>() { |
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373 |
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374 @Override |
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375 public void apply(Node usage, Node node) { |
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376 if (node instanceof PhiNode && !fixedNodes.contains(((PhiNode) node).merge())) { |
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377 // stop iterating: phis belonging to outside merges are known to be outside. |
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378 } else if (node instanceof FixedNode) { |
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379 // stop iterating: fixed nodes within the given set are traversal roots |
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380 // anyway, and all other |
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381 // fixed nodes are known to be outside. |
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382 } else if (!aboveBound.isMarked(node)) { |
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383 worklist.add(node); |
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384 aboveBound.mark(node); |
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385 } |
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386 } |
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387 }; |
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388 |
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389 if (stateAfter != null) { |
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390 stateAfter.applyToNonVirtual(aboveClosure); |
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391 } |
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392 while (!worklist.isEmpty()) { |
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393 Node current = worklist.remove(); |
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394 for (Node input : current.inputs()) { |
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395 aboveClosure.apply(current, input); |
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396 } |
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397 } |
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398 |
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399 // Build the set of nodes that have (transitive) inputs within the duplicatedNodes. |
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400 // This is achieved by iterating all nodes that are reachable via usages from the fixed |
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401 // nodes. |
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402 belowBound.markAll(fixedNodes); |
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403 worklist.addAll(fixedNodes); |
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404 |
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405 // the phis at the original merge should always be duplicated |
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406 for (PhiNode phi : merge.phis()) { |
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407 belowBound.mark(phi); |
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408 worklist.add(phi); |
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409 } |
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410 |
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411 while (!worklist.isEmpty()) { |
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412 Node current = worklist.remove(); |
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413 for (Node usage : current.usages()) { |
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414 if (usage instanceof PhiNode && !fixedNodes.contains(((PhiNode) usage).merge())) { |
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415 // stop iterating: phis belonging to outside merges are known to be outside. |
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416 } else if (usage instanceof FixedNode) { |
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417 // stop iterating: fixed nodes within the given set are traversal roots |
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418 // anyway, and all other |
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419 // fixed nodes are known to be outside. |
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420 } else if (!belowBound.isMarked(usage)) { |
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421 worklist.add(usage); |
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422 belowBound.mark(usage); |
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423 } |
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424 } |
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425 } |
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426 |
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427 // build the intersection |
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428 belowBound.intersect(aboveBound); |
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429 HashSet<Node> result = new HashSet<>(); |
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430 for (Node node : belowBound) { |
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431 result.add(node); |
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432 } |
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433 return result; |
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434 } |
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435 |
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436 /** |
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437 * Creates a new merge and end node construct at the end of the duplicated area. While it is |
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438 * useless in itself (merge with only one end) it simplifies the later duplication step. |
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440 * @param successor The successor of the duplicated set of nodes, i.e., the first node that |
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441 * should not be duplicated. |
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442 * @param stateAfterMerge The frame state that should be used for the merge. |
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443 * @return The newly created end node. |
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444 */ |
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445 private AbstractEndNode createNewMerge(FixedNode successor, FrameState stateAfterMerge) { |
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446 MergeNode newBottomMerge = graph.add(new MergeNode()); |
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447 AbstractEndNode newBottomEnd = graph.add(new EndNode()); |
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448 newBottomMerge.addForwardEnd(newBottomEnd); |
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449 newBottomMerge.setStateAfter(stateAfterMerge); |
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450 ((FixedWithNextNode) successor.predecessor()).setNext(newBottomEnd); |
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451 newBottomMerge.setNext(successor); |
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452 return newBottomEnd; |
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453 } |
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454 |
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455 /** |
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456 * Expands the set of nodes to be duplicated by looking at a number of conditions: |
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457 * <ul> |
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458 * <li>Inputs of type {@link InputType#Value} into the duplicated set will be rerouted to a |
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459 * new phi node.</li> |
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460 * <li>Inputs of type {@link InputType#Association}, {@link InputType#Condition} and |
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461 * {@link InputType#State} into the duplicated set will be rerouted to a duplicated version |
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462 * of the inside node.</li> |
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463 * <li>Dependencies into the duplicated nodes will be replaced with dependencies on the |
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464 * merge.</li> |
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465 * <li>Inputs of type {@link InputType#Association}, {@link InputType#Condition} and |
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466 * {@link InputType#State} to outside the duplicated set will cause the outside node to be |
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467 * pulled into the duplicated set.</li> |
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468 * </ul> |
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470 * @param duplicatedNodes The set of duplicated nodes that will be modified (expanded). |
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471 * @param newBottomMerge The merge that follows the duplicated set of nodes. It will be used |
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472 * for newly created phis and to as a target for dependencies that pointed into |
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473 * the duplicated set of nodes. |
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474 */ |
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475 private void expandDuplicated(HashSet<Node> duplicatedNodes, MergeNode newBottomMerge) { |
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476 Deque<Node> worklist = new ArrayDeque<>(duplicatedNodes); |
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477 |
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478 while (!worklist.isEmpty()) { |
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479 Node duplicated = worklist.remove(); |
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480 processUsages(duplicated, duplicatedNodes, newBottomMerge, worklist); |
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481 processInputs(duplicated, duplicatedNodes, worklist); |
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482 } |
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483 } |
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484 |
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485 private void processUsages(Node duplicated, HashSet<Node> duplicatedNodes, MergeNode newBottomMerge, Deque<Node> worklist) { |
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486 HashSet<Node> unique = new HashSet<>(); |
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487 duplicated.usages().snapshotTo(unique); |
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488 Node newOutsideClone = null; |
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489 for (Node usage : unique) { |
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490 if (!duplicatedNodes.contains(usage)) { |
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491 NodeClassIterator iter = usage.inputs().iterator(); |
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492 while (iter.hasNext()) { |
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493 Position pos = iter.nextPosition(); |
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494 if (pos.get(usage) == duplicated) { |
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495 switch (pos.getInputType(usage)) { |
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496 case Association: |
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497 case Condition: |
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498 case State: |
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499 // clone the offending node to the outside |
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500 if (newOutsideClone == null) { |
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501 newOutsideClone = duplicated.copyWithInputs(); |
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502 // this might cause other nodes to have outside usages |
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503 for (Node input : newOutsideClone.inputs()) { |
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504 if (duplicatedNodes.contains(input)) { |
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505 worklist.add(input); |
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506 } |
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507 } |
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508 } |
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509 pos.set(usage, newOutsideClone); |
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510 break; |
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511 case Guard: |
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512 case Anchor: |
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513 // re-route dependencies to the merge |
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514 pos.set(usage, newBottomMerge); |
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515 break; |
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516 case Value: |
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517 // introduce a new phi |
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518 ValueNode node = (ValueNode) duplicated; |
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519 PhiNode newPhi = bottomPhis.get(node); |
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520 if (newPhi == null) { |
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521 newPhi = graph.addWithoutUnique(new ValuePhiNode(node.stamp().unrestricted(), newBottomMerge)); |
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522 bottomPhis.put(node, newPhi); |
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523 newPhi.addInput(node); |
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524 } |
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525 pos.set(usage, newPhi); |
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526 break; |
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527 default: |
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528 throw GraalInternalError.shouldNotReachHere(); |
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529 } |
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530 } |
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531 } |
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532 } |
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533 } |
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534 } |
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535 |
15006
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536 private void processInputs(Node duplicated, HashSet<Node> duplicatedNodes, Deque<Node> worklist) { |
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537 // check if this node has an input that lies outside and cannot be shared |
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538 NodeClassIterator iter = duplicated.inputs().iterator(); |
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539 while (iter.hasNext()) { |
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540 Position pos = iter.nextPosition(); |
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541 Node input = pos.get(duplicated); |
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542 if (input != null && !duplicatedNodes.contains(input)) { |
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543 switch (pos.getInputType(duplicated)) { |
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544 case Association: |
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545 case Condition: |
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546 case State: |
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547 if (input != merge) { |
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548 duplicatedNodes.add(input); |
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549 worklist.add(input); |
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550 } |
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551 break; |
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552 case Guard: |
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553 case Anchor: |
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554 case Value: |
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555 // no change needed |
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556 break; |
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557 default: |
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558 throw GraalInternalError.shouldNotReachHere(); |
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559 } |
5786
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560 } |
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561 } |
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562 } |
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563 } |
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564 } |