Mercurial > hg > graal-compiler
annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/ArrayCopyNode.java @ 8559:af0c1352f969
more work on read elimination
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Thu, 28 Mar 2013 15:57:51 +0100 |
parents | 53cc1dd7ee18 |
children | 75db7afee829 |
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1 /* |
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2 * Copyright (c) 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.hotspot.replacements; |
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24 |
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25 import com.oracle.graal.api.meta.*; |
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26 import com.oracle.graal.debug.*; |
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27 import com.oracle.graal.graph.Node.IterableNodeType; |
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28 import com.oracle.graal.loop.phases.*; |
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29 import com.oracle.graal.nodes.*; |
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30 import com.oracle.graal.nodes.spi.*; |
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31 import com.oracle.graal.nodes.virtual.*; |
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32 import com.oracle.graal.phases.*; |
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33 import com.oracle.graal.phases.common.*; |
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34 import com.oracle.graal.replacements.*; |
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35 import com.oracle.graal.replacements.nodes.*; |
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36 |
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37 public class ArrayCopyNode extends MacroNode implements Virtualizable, IterableNodeType, Lowerable { |
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38 |
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39 public ArrayCopyNode(Invoke invoke) { |
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40 super(invoke); |
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41 } |
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42 |
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43 private ValueNode getSource() { |
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44 return arguments.get(0); |
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45 } |
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46 |
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47 private ValueNode getSourcePosition() { |
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48 return arguments.get(1); |
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49 } |
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50 |
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51 private ValueNode getDestination() { |
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52 return arguments.get(2); |
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53 } |
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54 |
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55 private ValueNode getDestinationPosition() { |
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56 return arguments.get(3); |
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57 } |
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58 |
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59 private ValueNode getLength() { |
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60 return arguments.get(4); |
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61 } |
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62 |
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63 private StructuredGraph selectSnippet(LoweringTool tool) { |
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64 ResolvedJavaType srcType = getSource().objectStamp().type(); |
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65 ResolvedJavaType destType = getDestination().objectStamp().type(); |
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66 |
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67 if (srcType == null || !srcType.isArray() || destType == null || !destType.isArray()) { |
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68 return null; |
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69 } |
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70 if (!destType.getComponentType().isAssignableFrom(srcType.getComponentType()) || !getDestination().objectStamp().isExactType()) { |
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71 return null; |
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72 } |
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73 Kind componentKind = srcType.getComponentType().getKind(); |
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74 ResolvedJavaMethod snippetMethod = tool.getRuntime().lookupJavaMethod(ArrayCopySnippets.getSnippetForKind(componentKind)); |
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75 return (StructuredGraph) snippetMethod.getCompilerStorage().get(Snippet.class); |
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76 } |
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77 |
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78 private static void unrollFixedLengthLoop(StructuredGraph snippetGraph, int length, LoweringTool tool) { |
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79 LocalNode lengthLocal = snippetGraph.getLocal(4); |
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80 if (lengthLocal != null) { |
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81 snippetGraph.replaceFloating(lengthLocal, ConstantNode.forInt(length, snippetGraph)); |
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82 } |
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83 // the canonicalization before loop unrolling is needed to propagate the length into |
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84 // additions, etc. |
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85 new CanonicalizerPhase(tool.getRuntime(), tool.assumptions()).apply(snippetGraph); |
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86 new LoopFullUnrollPhase(tool.getRuntime(), tool.assumptions()).apply(snippetGraph); |
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87 new CanonicalizerPhase(tool.getRuntime(), tool.assumptions()).apply(snippetGraph); |
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88 } |
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89 |
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90 @Override |
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91 protected StructuredGraph getSnippetGraph(LoweringTool tool) { |
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92 if (!GraalOptions.IntrinsifyArrayCopy) { |
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93 return null; |
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94 } |
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95 |
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96 StructuredGraph snippetGraph = selectSnippet(tool); |
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97 if (snippetGraph == null) { |
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98 ResolvedJavaMethod snippetMethod = tool.getRuntime().lookupJavaMethod(ArrayCopySnippets.genericArraycopySnippet); |
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99 snippetGraph = ((StructuredGraph) snippetMethod.getCompilerStorage().get(Snippet.class)).copy(); |
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100 assert snippetGraph != null : "ArrayCopySnippets should be installed"; |
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101 |
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102 replaceSnippetInvokes(snippetGraph); |
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103 } else { |
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104 assert snippetGraph != null : "ArrayCopySnippets should be installed"; |
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105 |
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106 if (getLength().isConstant()) { |
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107 snippetGraph = snippetGraph.copy(); |
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108 unrollFixedLengthLoop(snippetGraph, getLength().asConstant().asInt(), tool); |
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109 } |
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110 } |
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111 return snippetGraph; |
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112 } |
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113 |
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114 private static boolean checkBounds(int position, int length, VirtualObjectNode virtualObject) { |
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115 return position >= 0 && position + length <= virtualObject.entryCount(); |
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116 } |
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117 |
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118 private static boolean checkEntryTypes(int srcPos, int length, State srcState, ResolvedJavaType destComponentType) { |
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119 if (destComponentType.getKind() == Kind.Object) { |
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120 for (int i = 0; i < length; i++) { |
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121 if (!destComponentType.isAssignableFrom(srcState.getEntry(srcPos + i).objectStamp().type())) { |
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122 return false; |
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123 } |
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124 } |
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125 } |
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126 return true; |
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127 } |
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128 |
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129 @Override |
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130 public void virtualize(VirtualizerTool tool) { |
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131 if (getSourcePosition().isConstant() && getDestinationPosition().isConstant() && getLength().isConstant()) { |
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132 int srcPos = getSourcePosition().asConstant().asInt(); |
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133 int destPos = getDestinationPosition().asConstant().asInt(); |
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134 int length = getLength().asConstant().asInt(); |
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135 State srcState = tool.getObjectState(getSource()); |
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136 State destState = tool.getObjectState(getDestination()); |
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137 |
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138 if (srcState != null && srcState.getState() == EscapeState.Virtual && destState != null && destState.getState() == EscapeState.Virtual) { |
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139 VirtualObjectNode srcVirtual = srcState.getVirtualObject(); |
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140 VirtualObjectNode destVirtual = destState.getVirtualObject(); |
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141 if (length < 0 || !checkBounds(srcPos, length, srcVirtual) || !checkBounds(destPos, length, destVirtual)) { |
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142 return; |
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143 } |
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144 if (!checkEntryTypes(srcPos, length, srcState, destVirtual.type().getComponentType())) { |
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145 return; |
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146 } |
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147 for (int i = 0; i < length; i++) { |
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148 tool.setVirtualEntry(destState, destPos + i, srcState.getEntry(srcPos + i)); |
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149 } |
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150 tool.delete(); |
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151 if (Debug.isLogEnabled()) { |
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152 Debug.log("virtualized arraycopyf(%s, %d, %s, %d, %d)", getSource(), srcPos, getDestination(), destPos, length); |
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153 } |
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154 } |
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155 } |
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156 } |
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157 } |