Mercurial > hg > truffle
annotate graal/com.oracle.max.graal.nodes/src/com/oracle/max/graal/nodes/LoopBeginNode.java @ 4617:113d66f7454d
Add merge-before-loopend simplification for merges
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 16 Feb 2012 14:43:05 +0100 |
parents | a3882fd1ae61 |
children | a09b44a28e7f |
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1 /* |
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.oracle.max.graal.nodes; |
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24 |
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25 import java.util.*; |
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26 |
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27 import com.oracle.max.graal.graph.*; |
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28 import com.oracle.max.graal.graph.iterators.*; |
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29 import com.oracle.max.graal.nodes.spi.*; |
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30 |
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31 |
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32 public class LoopBeginNode extends MergeNode implements Node.IterableNodeType, LIRLowerable { |
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33 private double loopFrequency; |
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34 private int nextEndIndex; |
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35 |
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36 public LoopBeginNode() { |
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37 loopFrequency = 1; |
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38 } |
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39 |
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40 public double loopFrequency() { |
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41 return loopFrequency; |
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42 } |
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43 |
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44 public void setLoopFrequency(double loopFrequency) { |
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45 this.loopFrequency = loopFrequency; |
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46 } |
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47 |
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48 public NodeIterable<LoopEndNode> loopEnds() { |
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49 return usages().filter(LoopEndNode.class); |
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50 } |
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51 |
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52 public List<LoopEndNode> orderedLoopEnds() { |
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53 List<LoopEndNode> snapshot = usages().filter(LoopEndNode.class).snapshot(); |
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54 Collections.sort(snapshot, new Comparator<LoopEndNode>() { |
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55 @Override |
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56 public int compare(LoopEndNode o1, LoopEndNode o2) { |
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57 return o1.endIndex() - o2.endIndex(); |
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58 } |
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59 }); |
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60 return snapshot; |
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61 } |
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62 |
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63 public EndNode forwardEnd() { |
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64 assert forwardEndCount() == 1; |
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65 return forwardEndAt(0); |
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66 } |
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67 |
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68 @Override |
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69 public void generate(LIRGeneratorTool gen) { |
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70 // Nothing to emit, since this is node is used for structural purposes only. |
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71 } |
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72 |
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73 @Override |
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74 protected void deleteEnd(EndNode end) { |
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75 if (end instanceof LoopEndNode) { |
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76 LoopEndNode loopEnd = (LoopEndNode) end; |
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77 loopEnd.setLoopBegin(null); |
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78 int idx = loopEnd.endIndex(); |
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79 for (LoopEndNode le : loopEnds()) { |
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80 int leIdx = le.endIndex(); |
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81 assert leIdx != idx; |
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82 if (leIdx > idx) { |
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83 le.setEndIndex(leIdx - 1); |
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84 } |
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85 } |
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86 nextEndIndex--; |
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87 } else { |
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88 super.deleteEnd(end); |
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89 } |
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90 } |
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91 |
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92 @Override |
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93 public int phiPredecessorCount() { |
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94 return forwardEndCount() + loopEnds().count(); |
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95 } |
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96 |
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97 @Override |
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98 public int phiPredecessorIndex(EndNode pred) { |
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99 if (pred instanceof LoopEndNode) { |
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100 LoopEndNode loopEnd = (LoopEndNode) pred; |
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101 if (loopEnd.loopBegin() == this) { |
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102 assert loopEnd.endIndex() < loopEnds().count() : "Invalid endIndex : " + loopEnd; |
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103 return loopEnd.endIndex() + forwardEndCount(); |
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104 } |
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105 } else { |
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106 return super.forwardEndIndex(pred); |
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107 } |
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108 throw ValueUtil.shouldNotReachHere("unknown pred : " + pred); |
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109 } |
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110 |
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111 @Override |
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112 public EndNode phiPredecessorAt(int index) { |
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113 if (index < forwardEndCount()) { |
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114 return forwardEndAt(index); |
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115 } |
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116 for (LoopEndNode end : loopEnds()) { |
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117 int idx = index - forwardEndCount(); |
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118 assert idx >= 0; |
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119 if (end.endIndex() == idx) { |
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120 return end; |
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121 } |
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122 } |
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123 throw ValueUtil.shouldNotReachHere(); |
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124 } |
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125 |
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126 @Override |
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127 public boolean verify() { |
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128 assertTrue(loopEnds().count() > 0, "missing loopEnd"); |
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129 assertTrue(forwardEndCount() == 1, "LoopBegin should only have one forward edge"); |
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130 return super.verify(); |
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131 } |
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132 |
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133 @Override |
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134 public Map<Object, Object> getDebugProperties() { |
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135 Map<Object, Object> properties = super.getDebugProperties(); |
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136 properties.put("loopFrequency", String.format("%7.1f", loopFrequency)); |
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137 return properties; |
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138 } |
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139 |
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140 public int nextEndIndex() { |
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141 return nextEndIndex++; |
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142 } |
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143 |
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144 @Override |
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145 public void simplify(SimplifierTool tool) { |
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146 // nothing yet |
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147 } |
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148 } |