Mercurial > hg > truffle
annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/TailDuplicationPhase.java @ 15470:c55f44b3c5e5
remove NodesToDoubles, refactoring of node probability and inlining relevance computation
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Fri, 02 May 2014 12:02:27 +0200 |
parents | 882f4cb7cfcf |
children | 5d468add216f |
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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.compiler.common.GraalOptions.*; |
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26 |
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27 import java.util.*; |
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28 import java.util.function.*; |
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29 |
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30 import com.oracle.graal.compiler.common.*; |
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31 import com.oracle.graal.compiler.common.type.*; |
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32 import com.oracle.graal.debug.*; |
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33 import com.oracle.graal.graph.Graph.DuplicationReplacement; |
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34 import com.oracle.graal.graph.Graph.Mark; |
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35 import com.oracle.graal.graph.*; |
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36 import com.oracle.graal.graph.NodeClass.NodeClassIterator; |
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37 import com.oracle.graal.graph.NodeClass.Position; |
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38 import com.oracle.graal.nodes.*; |
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39 import com.oracle.graal.nodes.VirtualState.NodeClosure; |
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40 import com.oracle.graal.nodes.extended.*; |
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41 import com.oracle.graal.nodes.java.*; |
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42 import com.oracle.graal.nodes.spi.*; |
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43 import com.oracle.graal.nodes.util.*; |
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44 import com.oracle.graal.nodes.virtual.*; |
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45 import com.oracle.graal.phases.*; |
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46 import com.oracle.graal.phases.graph.*; |
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47 import com.oracle.graal.phases.tiers.*; |
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48 |
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49 /** |
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50 * This class is a phase that looks for opportunities for tail duplication. The static method |
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51 * {@link #tailDuplicate(MergeNode, TailDuplicationDecision, List, PhaseContext, CanonicalizerPhase)} |
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52 * can also be used to drive tail duplication from other places, e.g., inlining. |
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53 */ |
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54 public class TailDuplicationPhase extends BasePhase<PhaseContext> { |
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55 |
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56 /* |
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57 * Various metrics on the circumstances in which tail duplication was/wasn't performed. |
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58 */ |
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59 private static final DebugMetric metricDuplicationConsidered = Debug.metric("DuplicationConsidered"); |
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60 private static final DebugMetric metricDuplicationPerformed = Debug.metric("DuplicationPerformed"); |
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61 |
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62 private final CanonicalizerPhase canonicalizer; |
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63 |
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65 public DummyAnchorNode() { | |
66 super(StampFactory.forVoid()); | |
67 } | |
68 } | |
69 | |
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70 /** |
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71 * This interface is used by tail duplication to let clients decide if tail duplication should |
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72 * be performed. |
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73 */ |
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74 public interface TailDuplicationDecision { |
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75 |
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76 /** |
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77 * Queries if tail duplication should be performed at the given merge. If this method |
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78 * returns true then the tail duplication will be performed, because all other checks have |
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79 * happened before. |
15001 | 80 * |
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81 * @param merge The merge at which tail duplication can be performed. |
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82 * @param fixedNodeCount The size of the set of fixed nodes that forms the base for the |
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83 * duplicated set of nodes. |
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84 * @return true if the tail duplication should be performed, false otherwise. |
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85 */ |
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86 boolean doTransform(MergeNode merge, int fixedNodeCount); |
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87 } |
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88 |
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89 /** |
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90 * A tail duplication decision closure that employs the default algorithm: Check if there are |
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91 * any phis on the merge whose stamps improve and that have usages within the duplicated set of |
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92 * fixed nodes. |
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93 */ |
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94 public static final TailDuplicationDecision DEFAULT_DECISION = new TailDuplicationDecision() { |
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95 |
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96 public boolean doTransform(MergeNode merge, int fixedNodeCount) { |
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97 if (fixedNodeCount < TailDuplicationTrivialSize.getValue()) { |
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98 return true; |
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99 } |
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100 ArrayList<PhiNode> improvements = null; |
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101 for (PhiNode phi : merge.phis()) { |
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102 Stamp phiStamp = phi.stamp(); |
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103 for (ValueNode input : phi.values()) { |
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104 if (!input.stamp().equals(phiStamp)) { |
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105 if (improvements == null) { |
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106 improvements = new ArrayList<>(); |
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107 } |
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108 if (!improvements.contains(phi)) { |
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109 improvements.add(phi); |
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110 } |
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111 break; |
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112 } |
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113 } |
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114 } |
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115 if (improvements == null) { |
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116 return false; |
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117 } |
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118 FixedNode current = merge; |
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119 int opportunities = 0; |
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120 while (current instanceof FixedWithNextNode) { |
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121 current = ((FixedWithNextNode) current).next(); |
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122 if (current instanceof VirtualizableAllocation) { |
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123 return false; |
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124 } |
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125 for (PhiNode phi : improvements) { |
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126 for (Node input : current.inputs()) { |
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127 if (input == phi) { |
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128 opportunities++; |
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129 } |
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130 if (input.inputs().contains(phi)) { |
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131 opportunities++; |
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132 } |
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133 } |
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134 } |
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135 } |
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136 return opportunities > 0; |
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137 } |
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138 }; |
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139 |
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140 /** |
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141 * A tail duplication decision closure that always returns true. |
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142 */ |
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143 public static final TailDuplicationDecision TRUE_DECISION = new TailDuplicationDecision() { |
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144 |
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145 @Override |
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146 public boolean doTransform(MergeNode merge, int fixedNodeCount) { |
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147 return true; |
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148 } |
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149 }; |
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150 |
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151 public TailDuplicationPhase(CanonicalizerPhase canonicalizer) { |
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152 this.canonicalizer = canonicalizer; |
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153 } |
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154 |
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155 @Override |
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156 protected void run(StructuredGraph graph, PhaseContext phaseContext) { |
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157 if (graph.hasNode(MergeNode.class)) { |
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158 ToDoubleFunction<FixedNode> nodeProbabilities = new FixedNodeProbabilityCache(); |
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159 |
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160 // A snapshot is taken here, so that new MergeNode instances aren't considered for tail |
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161 // duplication. |
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162 for (MergeNode merge : graph.getNodes(MergeNode.class).snapshot()) { |
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163 if (!(merge instanceof LoopBeginNode) && nodeProbabilities.applyAsDouble(merge) >= TailDuplicationProbability.getValue()) { |
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164 tailDuplicate(merge, DEFAULT_DECISION, null, phaseContext, canonicalizer); |
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165 } |
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166 } |
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167 } |
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168 } |
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169 |
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170 /** |
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171 * This method attempts to duplicate the tail of the given merge. The merge must not be a |
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172 * {@link LoopBeginNode}. If the merge is eligible for duplication (at least one fixed node in |
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173 * its tail, no {@link MonitorEnterNode}/ {@link MonitorExitNode}, non-null |
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174 * {@link MergeNode#stateAfter()}) then the decision callback is used to determine whether the |
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175 * tail duplication should actually be performed. If replacements is non-null, then this list of |
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176 * {@link PiNode}s is used to replace one value per merge end. |
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178 * @param merge The merge whose tail should be duplicated. |
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179 * @param decision A callback that can make the final decision if tail duplication should occur |
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180 * or not. |
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181 * @param replacements A list of {@link PiNode}s, or null. If this list is non-null then its |
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182 * size needs to match the merge's end count. Each entry can either be null or a |
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183 * {@link PiNode}, and is used to replace {@link PiNode#object()} with the |
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184 * {@link PiNode} in the duplicated branch that corresponds to the entry. |
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185 * @param phaseContext |
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186 */ |
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187 public static boolean tailDuplicate(MergeNode merge, TailDuplicationDecision decision, List<GuardedValueNode> replacements, PhaseContext phaseContext, CanonicalizerPhase canonicalizer) { |
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188 assert !(merge instanceof LoopBeginNode); |
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189 assert replacements == null || replacements.size() == merge.forwardEndCount(); |
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190 FixedNode fixed = merge; |
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191 int fixedCount = 0; |
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192 while (fixed instanceof FixedWithNextNode) { |
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193 fixed = ((FixedWithNextNode) fixed).next(); |
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194 if (fixed instanceof CommitAllocationNode) { |
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195 return false; |
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196 } |
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197 fixedCount++; |
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198 } |
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199 if (fixedCount > 1) { |
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200 metricDuplicationConsidered.increment(); |
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201 if (decision.doTransform(merge, fixedCount)) { |
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202 metricDuplicationPerformed.increment(); |
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203 new DuplicationOperation(merge, replacements, canonicalizer).duplicate(phaseContext); |
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204 return true; |
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205 } |
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206 } |
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207 return false; |
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208 } |
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209 |
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210 /** |
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211 * This class encapsulates one tail duplication operation on a specific {@link MergeNode}. |
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212 */ |
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213 private static class DuplicationOperation { |
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214 |
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215 private final MergeNode merge; |
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216 private final StructuredGraph graph; |
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217 |
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218 private final HashMap<ValueNode, PhiNode> bottomPhis = new HashMap<>(); |
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219 private final List<GuardedValueNode> replacements; |
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220 |
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221 private final CanonicalizerPhase canonicalizer; |
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222 |
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223 /** |
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224 * Initializes the tail duplication operation without actually performing any work. |
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226 * @param merge The merge whose tail should be duplicated. |
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227 * @param replacements A list of replacement {@link PiNode}s, or null. If this is non-null, |
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228 * then the size of the list needs to match the number of end nodes at the merge. |
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229 */ |
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230 public DuplicationOperation(MergeNode merge, List<GuardedValueNode> replacements, CanonicalizerPhase canonicalizer) { |
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231 this.merge = merge; |
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232 this.replacements = replacements; |
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233 this.graph = merge.graph(); |
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234 this.canonicalizer = canonicalizer; |
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235 } |
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236 |
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237 /** |
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238 * Performs the actual tail duplication: |
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239 * <ul> |
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240 * <li>Creates a new {@link ValueAnchorNode} at the beginning of the duplicated area, an |
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241 * transfers all dependencies from the merge to this anchor.</li> |
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242 * <li>Determines the set of fixed nodes to be duplicated.</li> |
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243 * <li>Creates the new merge at the bottom of the duplicated area.</li> |
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244 * <li>Determines the complete set of duplicated nodes.</li> |
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245 * <li>Performs the actual duplication.</li> |
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246 * </ul> |
15001 | 247 * |
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248 * @param phaseContext |
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249 */ |
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250 private void duplicate(PhaseContext phaseContext) { |
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251 Debug.log("tail duplication at merge %s in %s", merge, graph.method()); |
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252 |
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253 Mark startMark = graph.getMark(); |
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254 |
15001 | 255 DummyAnchorNode anchor = addValueAnchor(); |
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256 |
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257 // determine the fixed nodes that should be duplicated (currently: all nodes up until |
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258 // the first control |
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259 // split, end node, deopt or return. |
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260 ArrayList<FixedNode> fixedNodes = new ArrayList<>(); |
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261 FixedNode fixed = merge.next(); |
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262 FrameState stateAfter = merge.stateAfter(); |
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263 while (fixed instanceof FixedWithNextNode) { |
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264 fixedNodes.add(fixed); |
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265 if (fixed instanceof StateSplit && ((StateSplit) fixed).stateAfter() != null) { |
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266 stateAfter = ((StateSplit) fixed).stateAfter(); |
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267 } |
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268 fixed = ((FixedWithNextNode) fixed).next(); |
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269 } |
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270 |
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271 AbstractEndNode endAfter = createNewMerge(fixed, stateAfter); |
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272 MergeNode mergeAfter = endAfter.merge(); |
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273 fixedNodes.add(endAfter); |
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274 final HashSet<Node> duplicatedNodes = buildDuplicatedNodeSet(fixedNodes, stateAfter); |
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275 mergeAfter.clearEnds(); |
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276 expandDuplicated(duplicatedNodes, mergeAfter); |
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277 |
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278 List<AbstractEndNode> endSnapshot = merge.forwardEnds().snapshot(); |
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279 List<PhiNode> phiSnapshot = merge.phis().snapshot(); |
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280 |
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281 int endIndex = 0; |
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282 for (final AbstractEndNode forwardEnd : merge.forwardEnds()) { |
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283 Map<Node, Node> duplicates; |
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284 if (replacements == null || replacements.get(endIndex) == null) { |
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285 duplicates = graph.addDuplicates(duplicatedNodes, graph, duplicatedNodes.size(), (DuplicationReplacement) null); |
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286 } else { |
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287 HashMap<Node, Node> replace = new HashMap<>(); |
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288 replace.put(replacements.get(endIndex).object(), replacements.get(endIndex)); |
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289 duplicates = graph.addDuplicates(duplicatedNodes, graph, duplicatedNodes.size(), replace); |
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290 } |
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291 for (Map.Entry<ValueNode, PhiNode> phi : bottomPhis.entrySet()) { |
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292 phi.getValue().initializeValueAt(merge.forwardEndIndex(forwardEnd), (ValueNode) duplicates.get(phi.getKey())); |
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293 } |
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294 mergeAfter.addForwardEnd((AbstractEndNode) duplicates.get(endAfter)); |
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295 |
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296 // re-wire the duplicated ValueAnchorNode to the predecessor of the corresponding |
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297 // EndNode |
15001 | 298 FixedWithNextNode anchorDuplicate = (FixedWithNextNode) duplicates.get(anchor); |
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299 // move dependencies on the ValueAnchorNode to the previous BeginNode |
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300 BeginNode prevBegin = BeginNode.prevBegin(forwardEnd); |
15001 | 301 anchorDuplicate.replaceAtUsages(InputType.Guard, prevBegin); |
302 anchorDuplicate.replaceAtUsages(InputType.Anchor, prevBegin); | |
303 assert anchorDuplicate.usages().isEmpty(); | |
304 | |
305 FixedNode next = anchorDuplicate.next(); | |
306 anchorDuplicate.setNext(null); | |
307 ((FixedWithNextNode) forwardEnd.predecessor()).setNext(next); | |
308 anchorDuplicate.safeDelete(); | |
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309 |
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310 // re-wire the phi duplicates to the correct input |
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311 for (PhiNode phi : phiSnapshot) { |
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312 PhiNode phiDuplicate = (PhiNode) duplicates.get(phi); |
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313 phiDuplicate.replaceAtUsages(phi.valueAt(forwardEnd)); |
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314 phiDuplicate.safeDelete(); |
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315 } |
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316 endIndex++; |
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317 } |
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318 GraphUtil.killCFG(merge); |
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319 for (AbstractEndNode forwardEnd : endSnapshot) { |
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320 forwardEnd.safeDelete(); |
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321 } |
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322 for (PhiNode phi : phiSnapshot) { |
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323 // these phis should go away, but they still need to be anchored to a merge to be |
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324 // valid... |
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325 if (phi.isAlive()) { |
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326 phi.setMerge(mergeAfter); |
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327 } |
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328 } |
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329 canonicalizer.applyIncremental(graph, phaseContext, startMark); |
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330 Debug.dump(graph, "After tail duplication at %s", merge); |
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331 } |
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332 |
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333 /** |
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334 * Inserts a new ValueAnchorNode after the merge and transfers all dependency-usages (not |
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335 * phis) to this ValueAnchorNode. |
15001 | 336 * |
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337 * @return The new {@link ValueAnchorNode} that was created. |
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338 */ |
15001 | 339 private DummyAnchorNode addValueAnchor() { |
340 DummyAnchorNode anchor = graph.add(new DummyAnchorNode()); | |
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341 graph.addAfterFixed(merge, anchor); |
15001 | 342 merge.replaceAtUsages(InputType.Guard, anchor); |
343 merge.replaceAtUsages(InputType.Anchor, anchor); | |
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344 return anchor; |
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345 } |
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346 |
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347 /** |
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348 * Given a set of fixed nodes, this method determines the set of fixed and floating nodes |
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349 * that needs to be duplicated, i.e., all nodes that due to data flow and other dependencies |
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350 * needs to be duplicated. |
15001 | 351 * |
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352 * @param fixedNodes The set of fixed nodes that should be duplicated. |
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353 * @param stateAfter The frame state of the merge that follows the set of fixed nodes. All |
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354 * {@link ValueNode}s reachable from this state are considered to be reachable |
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355 * from within the duplicated set of nodes. |
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356 * @return The set of nodes that need to be duplicated. |
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357 */ |
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358 private HashSet<Node> buildDuplicatedNodeSet(final ArrayList<FixedNode> fixedNodes, FrameState stateAfter) { |
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359 final NodeBitMap aboveBound = graph.createNodeBitMap(); |
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360 final NodeBitMap belowBound = graph.createNodeBitMap(); |
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361 |
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362 final Deque<Node> worklist = new ArrayDeque<>(); |
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363 |
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364 // Build the set of nodes that have (transitive) usages within the duplicatedNodes. |
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365 // This is achieved by iterating all nodes that are reachable via inputs from the the |
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366 // fixed nodes. |
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367 aboveBound.markAll(fixedNodes); |
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368 worklist.addAll(fixedNodes); |
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369 |
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370 // the phis at the original merge should always be duplicated |
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371 for (PhiNode phi : merge.phis()) { |
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372 aboveBound.mark(phi); |
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373 worklist.add(phi); |
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374 } |
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375 |
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376 NodeClosure<Node> aboveClosure = new NodeClosure<Node>() { |
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377 |
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378 @Override |
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379 public void apply(Node usage, Node node) { |
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380 if (node instanceof PhiNode && !fixedNodes.contains(((PhiNode) node).merge())) { |
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381 // stop iterating: phis belonging to outside merges are known to be outside. |
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382 } else if (node instanceof FixedNode) { |
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383 // stop iterating: fixed nodes within the given set are traversal roots |
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384 // anyway, and all other |
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385 // fixed nodes are known to be outside. |
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386 } else if (!aboveBound.isMarked(node)) { |
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387 worklist.add(node); |
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388 aboveBound.mark(node); |
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389 } |
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390 } |
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391 }; |
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392 |
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393 if (stateAfter != null) { |
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394 stateAfter.applyToNonVirtual(aboveClosure); |
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395 } |
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396 while (!worklist.isEmpty()) { |
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397 Node current = worklist.remove(); |
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398 for (Node input : current.inputs()) { |
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399 aboveClosure.apply(current, input); |
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400 } |
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401 } |
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402 |
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403 // Build the set of nodes that have (transitive) inputs within the duplicatedNodes. |
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404 // This is achieved by iterating all nodes that are reachable via usages from the fixed |
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405 // nodes. |
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406 belowBound.markAll(fixedNodes); |
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407 worklist.addAll(fixedNodes); |
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408 |
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409 // the phis at the original merge should always be duplicated |
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410 for (PhiNode phi : merge.phis()) { |
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411 belowBound.mark(phi); |
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412 worklist.add(phi); |
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413 } |
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414 |
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415 while (!worklist.isEmpty()) { |
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416 Node current = worklist.remove(); |
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417 for (Node usage : current.usages()) { |
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418 if (usage instanceof PhiNode && !fixedNodes.contains(((PhiNode) usage).merge())) { |
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419 // stop iterating: phis belonging to outside merges are known to be outside. |
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420 } else if (usage instanceof FixedNode) { |
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421 // stop iterating: fixed nodes within the given set are traversal roots |
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422 // anyway, and all other |
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423 // fixed nodes are known to be outside. |
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424 } else if (!belowBound.isMarked(usage)) { |
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425 worklist.add(usage); |
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426 belowBound.mark(usage); |
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427 } |
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428 } |
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429 } |
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430 |
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431 // build the intersection |
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432 belowBound.intersect(aboveBound); |
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433 HashSet<Node> result = new HashSet<>(); |
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434 for (Node node : belowBound) { |
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435 result.add(node); |
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436 } |
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437 return result; |
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438 } |
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439 |
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440 /** |
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441 * Creates a new merge and end node construct at the end of the duplicated area. While it is |
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442 * useless in itself (merge with only one end) it simplifies the later duplication step. |
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444 * @param successor The successor of the duplicated set of nodes, i.e., the first node that |
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445 * should not be duplicated. |
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446 * @param stateAfterMerge The frame state that should be used for the merge. |
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447 * @return The newly created end node. |
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448 */ |
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449 private AbstractEndNode createNewMerge(FixedNode successor, FrameState stateAfterMerge) { |
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450 MergeNode newBottomMerge = graph.add(new MergeNode()); |
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451 AbstractEndNode newBottomEnd = graph.add(new EndNode()); |
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452 newBottomMerge.addForwardEnd(newBottomEnd); |
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453 newBottomMerge.setStateAfter(stateAfterMerge); |
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454 ((FixedWithNextNode) successor.predecessor()).setNext(newBottomEnd); |
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455 newBottomMerge.setNext(successor); |
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456 return newBottomEnd; |
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457 } |
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458 |
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459 /** |
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460 * Expands the set of nodes to be duplicated by looking at a number of conditions: |
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461 * <ul> |
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462 * <li>Inputs of type {@link InputType#Value} into the duplicated set will be rerouted to a |
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463 * new phi node.</li> |
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464 * <li>Inputs of type {@link InputType#Association}, {@link InputType#Condition} and |
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465 * {@link InputType#State} into the duplicated set will be rerouted to a duplicated version |
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466 * of the inside node.</li> |
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467 * <li>Dependencies into the duplicated nodes will be replaced with dependencies on the |
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468 * merge.</li> |
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469 * <li>Inputs of type {@link InputType#Association}, {@link InputType#Condition} and |
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470 * {@link InputType#State} to outside the duplicated set will cause the outside node to be |
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471 * pulled into the duplicated set.</li> |
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472 * </ul> |
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474 * @param duplicatedNodes The set of duplicated nodes that will be modified (expanded). |
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475 * @param newBottomMerge The merge that follows the duplicated set of nodes. It will be used |
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476 * for newly created phis and to as a target for dependencies that pointed into |
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477 * the duplicated set of nodes. |
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478 */ |
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479 private void expandDuplicated(HashSet<Node> duplicatedNodes, MergeNode newBottomMerge) { |
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480 Deque<Node> worklist = new ArrayDeque<>(duplicatedNodes); |
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481 |
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482 while (!worklist.isEmpty()) { |
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483 Node duplicated = worklist.remove(); |
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484 processUsages(duplicated, duplicatedNodes, newBottomMerge, worklist); |
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485 processInputs(duplicated, duplicatedNodes, worklist); |
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486 } |
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487 } |
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488 |
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489 private void processUsages(Node duplicated, HashSet<Node> duplicatedNodes, MergeNode newBottomMerge, Deque<Node> worklist) { |
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490 HashSet<Node> unique = new HashSet<>(); |
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491 duplicated.usages().snapshotTo(unique); |
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492 Node newOutsideClone = null; |
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493 for (Node usage : unique) { |
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494 if (!duplicatedNodes.contains(usage)) { |
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495 NodeClassIterator iter = usage.inputs().iterator(); |
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496 while (iter.hasNext()) { |
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497 Position pos = iter.nextPosition(); |
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498 if (pos.get(usage) == duplicated) { |
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499 switch (pos.getInputType(usage)) { |
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500 case Extension: |
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501 case Condition: |
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502 case State: |
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503 // clone the offending node to the outside |
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504 if (newOutsideClone == null) { |
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505 newOutsideClone = duplicated.copyWithInputs(); |
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506 // this might cause other nodes to have outside usages |
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507 for (Node input : newOutsideClone.inputs()) { |
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508 if (duplicatedNodes.contains(input)) { |
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509 worklist.add(input); |
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510 } |
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511 } |
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512 } |
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513 pos.set(usage, newOutsideClone); |
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514 break; |
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515 case Guard: |
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516 case Anchor: |
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517 // re-route dependencies to the merge |
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518 pos.set(usage, newBottomMerge); |
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519 break; |
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520 case Value: |
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521 // introduce a new phi |
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522 ValueNode node = (ValueNode) duplicated; |
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523 PhiNode newPhi = bottomPhis.get(node); |
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524 if (newPhi == null) { |
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525 newPhi = graph.addWithoutUnique(new ValuePhiNode(node.stamp().unrestricted(), newBottomMerge)); |
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526 bottomPhis.put(node, newPhi); |
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527 newPhi.addInput(node); |
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528 } |
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529 pos.set(usage, newPhi); |
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530 break; |
15019
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531 case Association: |
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532 default: |
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533 throw GraalInternalError.shouldNotReachHere(); |
5786
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534 } |
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535 } |
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536 } |
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537 } |
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538 } |
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539 } |
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540 |
15006
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541 private void processInputs(Node duplicated, HashSet<Node> duplicatedNodes, Deque<Node> worklist) { |
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542 // check if this node has an input that lies outside and cannot be shared |
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543 NodeClassIterator iter = duplicated.inputs().iterator(); |
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544 while (iter.hasNext()) { |
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545 Position pos = iter.nextPosition(); |
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546 Node input = pos.get(duplicated); |
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547 if (input != null && !duplicatedNodes.contains(input)) { |
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548 switch (pos.getInputType(duplicated)) { |
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549 case Extension: |
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550 case Condition: |
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551 case State: |
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552 if (input != merge) { |
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553 duplicatedNodes.add(input); |
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554 worklist.add(input); |
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555 } |
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556 break; |
15019
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557 case Association: |
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558 case Guard: |
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559 case Anchor: |
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560 case Value: |
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561 // no change needed |
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562 break; |
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563 default: |
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564 throw GraalInternalError.shouldNotReachHere(); |
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565 } |
5786
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|
566 } |
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diff
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|
567 } |
f69a406355b2
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|
568 } |
f69a406355b2
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|
569 } |
f69a406355b2
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570 } |