Mercurial > hg > graal-jvmci-8
annotate graal/GraalCompiler/src/com/sun/c1x/ir/ComputeLinearScanOrder.java @ 2653:7c8ad40c1f88
No need for stateAfter on volatile field loads.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 11 May 2011 15:11:33 +0200 |
parents | 6d19b4f476db |
children | 4a6518c4d17d |
rev | line source |
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1 /* |
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2 * Copyright (c) 2009, 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 |
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24 package com.sun.c1x.ir; |
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25 |
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26 import java.util.*; |
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27 |
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28 import com.sun.c1x.*; |
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29 import com.sun.c1x.debug.*; |
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30 import com.sun.c1x.util.*; |
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31 import com.sun.cri.ci.*; |
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32 |
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33 /** |
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34 * @author Thomas Wuerthinger |
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35 * |
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36 */ |
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37 public final class ComputeLinearScanOrder { |
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38 |
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39 private final int maxBlockId; // the highest blockId of a block |
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40 private int numBlocks; // total number of blocks (smaller than maxBlockId) |
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41 private int numLoops; // total number of loops |
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42 private boolean iterativeDominators; // method requires iterative computation of dominators |
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43 |
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44 List<BlockBegin> linearScanOrder; // the resulting list of blocks in correct order |
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45 |
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46 final CiBitMap visitedBlocks; // used for recursive processing of blocks |
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47 final CiBitMap activeBlocks; // used for recursive processing of blocks |
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48 final CiBitMap dominatorBlocks; // temporary BitMap used for computation of dominator |
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49 final int[] forwardBranches; // number of incoming forward branches for each block |
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50 final List<BlockBegin> loopEndBlocks; // list of all loop end blocks collected during countEdges |
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51 BitMap2D loopMap; // two-dimensional bit set: a bit is set if a block is contained in a loop |
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52 final List<BlockBegin> workList; // temporary list (used in markLoops and computeOrder) |
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53 |
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54 // accessors for visitedBlocks and activeBlocks |
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55 private void initVisited() { |
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56 activeBlocks.clearAll(); |
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57 visitedBlocks.clearAll(); |
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58 } |
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59 |
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60 private boolean isVisited(BlockBegin b) { |
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61 return visitedBlocks.get(b.blockID); |
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62 } |
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63 |
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64 private boolean isActive(BlockBegin b) { |
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65 return activeBlocks.get(b.blockID); |
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66 } |
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67 |
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68 private void setVisited(BlockBegin b) { |
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69 assert !isVisited(b) : "already set"; |
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70 visitedBlocks.set(b.blockID); |
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71 } |
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72 |
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73 private void setActive(BlockBegin b) { |
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74 assert !isActive(b) : "already set"; |
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75 activeBlocks.set(b.blockID); |
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76 } |
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77 |
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78 private void clearActive(BlockBegin b) { |
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79 assert isActive(b) : "not already"; |
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80 activeBlocks.clear(b.blockID); |
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81 } |
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82 |
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83 // accessors for forwardBranches |
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84 private void incForwardBranches(BlockBegin b) { |
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85 forwardBranches[b.blockID]++; |
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86 } |
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87 |
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88 private int decForwardBranches(BlockBegin b) { |
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89 return --forwardBranches[b.blockID]; |
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90 } |
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91 |
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92 // accessors for loopMap |
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93 private boolean isBlockInLoop(int loopIdx, BlockBegin b) { |
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94 return loopMap.at(loopIdx, b.blockID); |
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95 } |
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96 |
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97 private void setBlockInLoop(int loopIdx, BlockBegin b) { |
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98 loopMap.setBit(loopIdx, b.blockID); |
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99 } |
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100 |
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101 private void clearBlockInLoop(int loopIdx, int blockId) { |
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102 loopMap.clearBit(loopIdx, blockId); |
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103 } |
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104 |
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105 // accessors for final result |
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106 public List<BlockBegin> linearScanOrder() { |
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107 return linearScanOrder; |
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108 } |
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109 |
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110 public int numLoops() { |
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111 return numLoops; |
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112 } |
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113 |
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114 public ComputeLinearScanOrder(int maxBlockId, BlockBegin startBlock) { |
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115 |
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116 this.maxBlockId = maxBlockId; |
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117 visitedBlocks = new CiBitMap(maxBlockId); |
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118 activeBlocks = new CiBitMap(maxBlockId); |
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119 dominatorBlocks = new CiBitMap(maxBlockId); |
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120 forwardBranches = new int[maxBlockId]; |
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121 loopEndBlocks = new ArrayList<BlockBegin>(8); |
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122 workList = new ArrayList<BlockBegin>(8); |
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123 |
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124 countEdges(startBlock, null); |
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125 |
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126 if (numLoops > 0) { |
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127 markLoops(); |
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128 clearNonNaturalLoops(startBlock); |
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129 assignLoopDepth(startBlock); |
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130 } |
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131 |
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132 computeOrder(startBlock); |
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133 computeDominators(); |
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134 |
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135 printBlocks(); |
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136 assert verify(); |
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137 } |
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138 |
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139 /** |
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140 * Traverses the CFG to analyze block and edge info. The analysis performed is: |
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141 * |
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142 * 1. Count of total number of blocks. |
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143 * 2. Count of all incoming edges and backward incoming edges. |
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144 * 3. Number loop header blocks. |
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145 * 4. Create a list with all loop end blocks. |
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146 */ |
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147 private void countEdges(BlockBegin cur, BlockBegin parent) { |
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148 if (C1XOptions.TraceLinearScanLevel >= 3) { |
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149 TTY.println("Counting edges for block B%d%s", cur.blockID, parent == null ? "" : " coming from B" + parent.blockID); |
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150 } |
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151 assert cur.dominator() == null : "dominator already initialized"; |
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152 |
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153 if (isActive(cur)) { |
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154 if (C1XOptions.TraceLinearScanLevel >= 3) { |
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155 TTY.println("backward branch"); |
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156 } |
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157 assert isVisited(cur) : "block must be visited when block is active"; |
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158 assert parent != null : "must have parent"; |
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159 |
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160 cur.setBlockFlag(BlockBegin.BlockFlag.LinearScanLoopHeader); |
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161 cur.setBlockFlag(BlockBegin.BlockFlag.BackwardBranchTarget); |
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162 |
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163 parent.setBlockFlag(BlockBegin.BlockFlag.LinearScanLoopEnd); |
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164 |
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165 // When a loop header is also the start of an exception handler, then the backward branch is |
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166 // an exception edge. Because such edges are usually critical edges which cannot be split, the |
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167 // loop must be excluded here from processing. |
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168 if (cur.checkBlockFlag(BlockBegin.BlockFlag.ExceptionEntry)) { |
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169 // Make sure that dominators are correct in this weird situation |
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170 iterativeDominators = true; |
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171 return; |
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172 } |
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173 |
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174 loopEndBlocks.add(parent); |
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175 return; |
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176 } |
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177 |
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178 // increment number of incoming forward branches |
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179 incForwardBranches(cur); |
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180 |
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181 if (isVisited(cur)) { |
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182 if (C1XOptions.TraceLinearScanLevel >= 3) { |
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183 TTY.println("block already visited"); |
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184 } |
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185 return; |
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186 } |
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187 |
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188 numBlocks++; |
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189 setVisited(cur); |
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190 setActive(cur); |
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191 |
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192 // recursive call for all successors |
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193 int i; |
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194 for (i = cur.numberOfSux() - 1; i >= 0; i--) { |
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195 countEdges(cur.suxAt(i), cur); |
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196 } |
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197 for (i = cur.numberOfExceptionHandlers() - 1; i >= 0; i--) { |
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198 countEdges(cur.exceptionHandlerAt(i), cur); |
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199 } |
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200 |
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201 clearActive(cur); |
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202 |
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203 // Each loop has a unique number. |
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204 // When multiple loops are nested, assignLoopDepth assumes that the |
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205 // innermost loop has the lowest number. This is guaranteed by setting |
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206 // the loop number after the recursive calls for the successors above |
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207 // have returned. |
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208 if (cur.checkBlockFlag(BlockBegin.BlockFlag.LinearScanLoopHeader)) { |
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209 assert cur.loopIndex() == -1 : "cannot set loop-index twice"; |
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210 if (C1XOptions.TraceLinearScanLevel >= 3) { |
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211 TTY.println("Block B%d is loop header of loop %d", cur.blockID, numLoops); |
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212 } |
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213 |
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214 cur.setLoopIndex(numLoops); |
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215 numLoops++; |
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216 } |
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217 |
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218 if (C1XOptions.TraceLinearScanLevel >= 3) { |
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219 TTY.println("Finished counting edges for block B%d", cur.blockID); |
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220 } |
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221 } |
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222 |
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223 private void markLoops() { |
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224 if (C1XOptions.TraceLinearScanLevel >= 3) { |
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225 TTY.println("----- marking loops"); |
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226 } |
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227 |
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228 loopMap = new BitMap2D(numLoops, maxBlockId); |
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229 |
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230 for (int i = loopEndBlocks.size() - 1; i >= 0; i--) { |
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231 BlockBegin loopEnd = loopEndBlocks.get(i); |
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232 BlockBegin loopStart = loopEnd.suxAt(0); |
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233 int loopIdx = loopStart.loopIndex(); |
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234 |
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235 if (C1XOptions.TraceLinearScanLevel >= 3) { |
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236 TTY.println("Processing loop from B%d to B%d (loop %d):", loopStart.blockID, loopEnd.blockID, loopIdx); |
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237 } |
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238 assert loopEnd.checkBlockFlag(BlockBegin.BlockFlag.LinearScanLoopEnd) : "loop end flag must be set"; |
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239 assert loopStart.checkBlockFlag(BlockBegin.BlockFlag.LinearScanLoopHeader) : "loop header flag must be set"; |
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240 assert loopIdx >= 0 && loopIdx < numLoops : "loop index not set"; |
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241 assert workList.isEmpty() : "work list must be empty before processing"; |
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242 |
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243 // add the end-block of the loop to the working list |
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244 workList.add(loopEnd); |
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245 setBlockInLoop(loopIdx, loopEnd); |
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246 do { |
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247 BlockBegin cur = workList.remove(workList.size() - 1); |
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248 |
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249 if (C1XOptions.TraceLinearScanLevel >= 3) { |
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250 TTY.println(" processing B%d", cur.blockID); |
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251 } |
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252 assert isBlockInLoop(loopIdx, cur) : "bit in loop map must be set when block is in work list"; |
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253 |
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254 // recursive processing of all predecessors ends when start block of loop is reached |
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255 if (cur != loopStart) { |
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256 for (int j = cur.numberOfPreds() - 1; j >= 0; j--) { |
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257 BlockBegin pred = cur.predAt(j); |
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258 |
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259 if (!isBlockInLoop(loopIdx, pred)) { |
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260 // this predecessor has not been processed yet, so add it to work list |
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261 if (C1XOptions.TraceLinearScanLevel >= 3) { |
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262 TTY.println(" pushing B%d", pred.blockID); |
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263 } |
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264 workList.add(pred); |
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265 setBlockInLoop(loopIdx, pred); |
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266 } |
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267 } |
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268 } |
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269 } while (!workList.isEmpty()); |
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270 } |
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271 } |
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272 |
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273 // check for non-natural loops (loops where the loop header does not dominate |
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274 // all other loop blocks = loops with multiple entries). |
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275 // such loops are ignored |
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276 private void clearNonNaturalLoops(BlockBegin startBlock) { |
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277 for (int i = numLoops - 1; i >= 0; i--) { |
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278 if (isBlockInLoop(i, startBlock)) { |
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279 // loop i contains the entry block of the method. |
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280 // this is not a natural loop, so ignore it |
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281 if (C1XOptions.TraceLinearScanLevel >= 2) { |
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282 TTY.println("Loop %d is non-natural, so it is ignored", i); |
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283 } |
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284 |
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285 for (int blockId = maxBlockId - 1; blockId >= 0; blockId--) { |
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286 clearBlockInLoop(i, blockId); |
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287 } |
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288 iterativeDominators = true; |
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289 } |
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290 } |
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291 } |
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292 |
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293 private void assignLoopDepth(BlockBegin startBlock) { |
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294 if (C1XOptions.TraceLinearScanLevel >= 3) { |
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295 TTY.println("----- computing loop-depth and weight"); |
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296 } |
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297 initVisited(); |
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298 |
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299 assert workList.isEmpty() : "work list must be empty before processing"; |
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300 workList.add(startBlock); |
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301 |
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302 do { |
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303 BlockBegin cur = workList.remove(workList.size() - 1); |
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304 |
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305 if (!isVisited(cur)) { |
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306 setVisited(cur); |
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307 if (C1XOptions.TraceLinearScanLevel >= 4) { |
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308 TTY.println("Computing loop depth for block B%d", cur.blockID); |
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309 } |
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310 |
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311 // compute loop-depth and loop-index for the block |
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312 assert cur.loopDepth() == 0 : "cannot set loop-depth twice"; |
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313 int i; |
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314 int loopDepth = 0; |
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315 int minLoopIdx = -1; |
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316 for (i = numLoops - 1; i >= 0; i--) { |
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317 if (isBlockInLoop(i, cur)) { |
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318 loopDepth++; |
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319 minLoopIdx = i; |
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320 } |
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321 } |
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322 cur.setLoopDepth(loopDepth); |
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323 cur.setLoopIndex(minLoopIdx); |
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324 |
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325 // append all unvisited successors to work list |
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326 for (i = cur.numberOfSux() - 1; i >= 0; i--) { |
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327 workList.add(cur.suxAt(i)); |
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328 } |
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329 for (i = cur.numberOfExceptionHandlers() - 1; i >= 0; i--) { |
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330 workList.add(cur.exceptionHandlerAt(i)); |
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331 } |
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332 } |
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333 } while (!workList.isEmpty()); |
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334 } |
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335 |
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336 private BlockBegin commonDominator(BlockBegin a, BlockBegin b) { |
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337 assert a != null && b != null : "must have input blocks"; |
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338 |
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339 dominatorBlocks.clearAll(); |
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340 while (a != null) { |
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341 dominatorBlocks.set(a.blockID); |
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342 assert a.dominator() != null || a == linearScanOrder.get(0) : "dominator must be initialized"; |
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343 a = a.dominator(); |
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344 } |
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345 while (b != null && !dominatorBlocks.get(b.blockID)) { |
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346 assert b.dominator() != null || b == linearScanOrder.get(0) : "dominator must be initialized"; |
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347 b = b.dominator(); |
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348 } |
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349 |
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350 assert b != null : "could not find dominator"; |
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351 return b; |
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352 } |
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353 |
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354 private void computeDominator(BlockBegin cur, BlockBegin parent) { |
2507
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355 if (cur.dominator() == null) { |
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356 if (C1XOptions.TraceLinearScanLevel >= 4) { |
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357 TTY.println("DOM: initializing dominator of B%d to B%d", cur.blockID, parent.blockID); |
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358 } |
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359 if (cur.isExceptionEntry()) { |
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360 assert parent.dominator() != null; |
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361 cur.setDominator(parent.dominator()); |
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362 } else { |
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363 cur.setDominator(parent); |
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364 } |
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365 |
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366 } else if (!(cur.checkBlockFlag(BlockBegin.BlockFlag.LinearScanLoopHeader) && parent.checkBlockFlag(BlockBegin.BlockFlag.LinearScanLoopEnd))) { |
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367 if (C1XOptions.TraceLinearScanLevel >= 4) { |
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368 TTY.println("DOM: computing dominator of B%d: common dominator of B%d and B%d is B%d", cur.blockID, parent.blockID, cur.dominator().blockID, commonDominator(cur.dominator(), parent).blockID); |
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369 } |
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370 assert cur.numberOfPreds() > 1 : ""; |
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371 cur.setDominator(commonDominator(cur.dominator(), parent)); |
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372 } |
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373 } |
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374 |
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No need for stateAfter on volatile field loads.
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375 private int computeWeight(BlockBegin cur) { |
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376 BlockBegin singleSux = null; |
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377 if (cur.numberOfSux() == 1) { |
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378 singleSux = cur.suxAt(0); |
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379 } |
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380 |
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381 // limit loop-depth to 15 bit (only for security reason, it will never be so big) |
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382 int weight = (cur.loopDepth() & 0x7FFF) << 16; |
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383 |
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384 int curBit = 15; |
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|
385 |
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386 // this is necessary for the (very rare) case that two successive blocks have |
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parents:
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387 // the same loop depth, but a different loop index (can happen for endless loops |
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388 // with exception handlers) |
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389 if (!cur.checkBlockFlag(BlockBegin.BlockFlag.LinearScanLoopHeader)) { |
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390 weight |= (1 << curBit); |
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391 } |
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392 curBit--; |
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|
393 |
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394 // loop end blocks (blocks that end with a backward branch) are added |
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395 // after all other blocks of the loop. |
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396 if (!cur.checkBlockFlag(BlockBegin.BlockFlag.LinearScanLoopEnd)) { |
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397 weight |= (1 << curBit); |
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398 } |
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399 curBit--; |
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|
400 |
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401 // critical edge split blocks are preferred because then they have a greater |
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402 // probability to be completely empty |
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403 if (cur.isCriticalEdgeSplit()) { |
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404 weight |= (1 << curBit); |
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405 } |
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406 curBit--; |
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407 |
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408 // exceptions should not be thrown in normal control flow, so these blocks |
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409 // are added as late as possible |
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410 if (!(cur.end() instanceof Throw) && (singleSux == null || !(singleSux.end() instanceof Throw))) { |
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411 weight |= (1 << curBit); |
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412 } |
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413 curBit--; |
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414 if (!(cur.end() instanceof Return) && (singleSux == null || !(singleSux.end() instanceof Return))) { |
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415 weight |= (1 << curBit); |
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416 } |
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417 curBit--; |
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|
418 |
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419 // exceptions handlers are added as late as possible |
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420 if (!cur.checkBlockFlag(BlockBegin.BlockFlag.ExceptionEntry)) { |
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421 weight |= (1 << curBit); |
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422 } |
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423 curBit--; |
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|
424 |
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425 // guarantee that weight is > 0 |
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426 weight |= 1; |
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|
427 |
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428 assert curBit >= 0 : "too many flags"; |
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429 assert weight > 0 : "weight cannot become negative"; |
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430 |
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431 return weight; |
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432 } |
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433 |
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No need for stateAfter on volatile field loads.
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434 private boolean readyForProcessing(BlockBegin cur) { |
2507
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435 // Discount the edge just traveled. |
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436 // When the number drops to zero, all forward branches were processed |
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437 if (decForwardBranches(cur) != 0) { |
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438 return false; |
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439 } |
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440 |
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441 assert !linearScanOrder.contains(cur) : "block already processed (block can be ready only once)"; |
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442 assert !workList.contains(cur) : "block already in work-list (block can be ready only once)"; |
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443 return true; |
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444 } |
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445 |
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No need for stateAfter on volatile field loads.
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446 private void sortIntoWorkList(BlockBegin cur) { |
2507
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447 assert !workList.contains(cur) : "block already in work list"; |
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|
448 |
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449 int curWeight = computeWeight(cur); |
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|
450 |
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451 // the linearScanNumber is used to cache the weight of a block |
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452 cur.setLinearScanNumber(curWeight); |
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|
453 |
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454 if (C1XOptions.StressLinearScan) { |
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455 workList.add(0, cur); |
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456 return; |
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457 } |
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|
458 |
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459 workList.add(null); // provide space for new element |
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|
460 |
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461 int insertIdx = workList.size() - 1; |
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462 while (insertIdx > 0 && workList.get(insertIdx - 1).linearScanNumber() > curWeight) { |
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463 workList.set(insertIdx, workList.get(insertIdx - 1)); |
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464 insertIdx--; |
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|
465 } |
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|
466 workList.set(insertIdx, cur); |
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parents:
diff
changeset
|
467 |
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diff
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|
468 if (C1XOptions.TraceLinearScanLevel >= 3) { |
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|
469 TTY.println("Sorted B%d into worklist. new worklist:", cur.blockID); |
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parents:
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|
470 for (int i = 0; i < workList.size(); i++) { |
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471 TTY.println(String.format("%8d B%02d weight:%6x", i, workList.get(i).blockID, workList.get(i).linearScanNumber())); |
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Pull over of compiler from maxine repository.
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diff
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|
472 } |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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|
473 } |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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|
474 |
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parents:
diff
changeset
|
475 for (int i = 0; i < workList.size(); i++) { |
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parents:
diff
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|
476 assert workList.get(i).linearScanNumber() > 0 : "weight not set"; |
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parents:
diff
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|
477 assert i == 0 || workList.get(i - 1).linearScanNumber() <= workList.get(i).linearScanNumber() : "incorrect order in worklist"; |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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|
478 } |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
479 } |
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parents:
diff
changeset
|
480 |
2653
7c8ad40c1f88
No need for stateAfter on volatile field loads.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
2652
diff
changeset
|
481 private void appendBlock(BlockBegin cur) { |
2507
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diff
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|
482 if (C1XOptions.TraceLinearScanLevel >= 3) { |
9ec15d6914ca
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parents:
diff
changeset
|
483 TTY.println("appending block B%d (weight 0x%06x) to linear-scan order", cur.blockID, cur.linearScanNumber()); |
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parents:
diff
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|
484 } |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
485 assert !linearScanOrder.contains(cur) : "cannot add the same block twice"; |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
486 |
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parents:
diff
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|
487 // currently, the linear scan order and code emit order are equal. |
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parents:
diff
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|
488 // therefore the linearScanNumber and the weight of a block must also |
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parents:
diff
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|
489 // be equal. |
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parents:
diff
changeset
|
490 cur.setLinearScanNumber(linearScanOrder.size()); |
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parents:
diff
changeset
|
491 linearScanOrder.add(cur); |
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parents:
diff
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|
492 } |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
493 |
2653
7c8ad40c1f88
No need for stateAfter on volatile field loads.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
2652
diff
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|
494 private void computeOrder(BlockBegin startBlock) { |
2507
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diff
changeset
|
495 if (C1XOptions.TraceLinearScanLevel >= 3) { |
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parents:
diff
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|
496 TTY.println("----- computing final block order"); |
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parents:
diff
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|
497 } |
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parents:
diff
changeset
|
498 |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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|
499 // the start block is always the first block in the linear scan order |
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500 linearScanOrder = new ArrayList<BlockBegin>(numBlocks); |
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501 appendBlock(startBlock); |
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Pull over of compiler from maxine repository.
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parents:
diff
changeset
|
502 |
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Pull over of compiler from maxine repository.
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503 assert startBlock.end() instanceof Base : "start block must end with Base-instruction"; |
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Pull over of compiler from maxine repository.
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parents:
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504 BlockBegin stdEntry = ((Base) startBlock.end()).standardEntry(); |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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diff
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|
505 |
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parents:
diff
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506 computeDominator(stdEntry, startBlock); |
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parents:
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|
507 |
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508 // start processing with standard entry block |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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509 assert workList.isEmpty() : "list must be empty before processing"; |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
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|
510 |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
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511 if (readyForProcessing(stdEntry)) { |
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Pull over of compiler from maxine repository.
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512 sortIntoWorkList(stdEntry); |
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513 } else { |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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|
514 throw new CiBailout("the stdEntry must be ready for processing (otherwise, the method has no start block)"); |
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diff
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|
515 } |
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Pull over of compiler from maxine repository.
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diff
changeset
|
516 |
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517 do { |
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diff
changeset
|
518 BlockBegin cur = workList.remove(workList.size() - 1); |
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519 appendBlock(cur); |
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|
520 |
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521 int i; |
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522 int numSux = cur.numberOfSux(); |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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523 // changed loop order to get "intuitive" order of if- and else-blocks |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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524 for (i = 0; i < numSux; i++) { |
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525 BlockBegin sux = cur.suxAt(i); |
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526 computeDominator(sux, cur); |
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527 if (readyForProcessing(sux)) { |
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528 sortIntoWorkList(sux); |
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529 } |
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|
530 } |
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diff
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|
531 numSux = cur.numberOfExceptionHandlers(); |
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532 for (i = 0; i < numSux; i++) { |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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533 BlockBegin sux = cur.exceptionHandlerAt(i); |
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534 computeDominator(sux, cur); |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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535 if (readyForProcessing(sux)) { |
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536 sortIntoWorkList(sux); |
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parents:
diff
changeset
|
537 } |
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diff
changeset
|
538 } |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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|
539 } while (workList.size() > 0); |
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540 } |
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parents:
diff
changeset
|
541 |
2653
7c8ad40c1f88
No need for stateAfter on volatile field loads.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
2652
diff
changeset
|
542 private boolean computeDominatorsIter() { |
2507
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543 boolean changed = false; |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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544 int numBlocks = linearScanOrder.size(); |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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|
545 |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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546 assert linearScanOrder.get(0).dominator() == null : "must not have dominator"; |
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547 assert linearScanOrder.get(0).numberOfPreds() == 0 : "must not have predecessors"; |
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548 for (int i = 1; i < numBlocks; i++) { |
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parents:
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549 BlockBegin block = linearScanOrder.get(i); |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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|
550 |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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changeset
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551 assert block.numberOfPreds() > 0; |
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parents:
diff
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552 BlockBegin dominator = block.predAt(0); |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
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553 if (block.isExceptionEntry()) { |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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554 dominator = dominator.dominator(); |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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|
555 } |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
556 |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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|
557 int numPreds = block.numberOfPreds(); |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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558 for (int j = 1; j < numPreds; j++) { |
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559 BlockBegin curPred = block.predAt(j); |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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560 if (block.isExceptionEntry()) { |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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diff
changeset
|
561 curPred = curPred.dominator(); |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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|
562 } |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
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563 dominator = commonDominator(dominator, curPred); |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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|
564 } |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
565 |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
566 if (dominator != block.dominator()) { |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
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567 if (C1XOptions.TraceLinearScanLevel >= 4) { |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
568 TTY.println("DOM: updating dominator of B%d from B%d to B%d", block.blockID, block.dominator().blockID, dominator.blockID); |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
569 } |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
570 block.setDominator(dominator); |
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Pull over of compiler from maxine repository.
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parents:
diff
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|
571 changed = true; |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
572 } |
9ec15d6914ca
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
573 } |
9ec15d6914ca
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
574 return changed; |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
575 } |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
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diff
changeset
|
576 |
2653
7c8ad40c1f88
No need for stateAfter on volatile field loads.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
2652
diff
changeset
|
577 private void computeDominators() { |
2507
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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|
578 if (C1XOptions.TraceLinearScanLevel >= 3) { |
2653
7c8ad40c1f88
No need for stateAfter on volatile field loads.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
2652
diff
changeset
|
579 TTY.println("----- computing dominators (iterative computation required: %b)", iterativeDominators); |
2507
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
580 } |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
581 |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
582 // iterative computation of dominators is only required for methods with non-natural loops |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
583 // and OSR-methods. For all other methods : the dominators computed when generating the |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
584 // linear scan block order are correct. |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
585 if (iterativeDominators) { |
9ec15d6914ca
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parents:
diff
changeset
|
586 do { |
9ec15d6914ca
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parents:
diff
changeset
|
587 if (C1XOptions.TraceLinearScanLevel >= 1) { |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
588 TTY.println("DOM: next iteration of fix-point calculation"); |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
589 } |
9ec15d6914ca
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
590 } while (computeDominatorsIter()); |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
591 } |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
592 |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
593 // check that dominators are correct |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
594 assert !computeDominatorsIter() : "fix point not reached"; |
9ec15d6914ca
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
595 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
596 |
9ec15d6914ca
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
597 public void printBlocks() { |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
598 if (C1XOptions.TraceLinearScanLevel >= 2) { |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
599 TTY.println("----- loop information:"); |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
600 for (BlockBegin cur : linearScanOrder) { |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
601 TTY.print(String.format("%4d: B%02d: ", cur.linearScanNumber(), cur.blockID)); |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
602 for (int loopIdx = 0; loopIdx < numLoops; loopIdx++) { |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
603 TTY.print(String.format("%d = %b ", loopIdx, isBlockInLoop(loopIdx, cur))); |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
604 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
605 TTY.println(String.format(" . loopIndex: %2d, loopDepth: %2d", cur.loopIndex(), cur.loopDepth())); |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
606 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
607 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
608 |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
609 if (C1XOptions.TraceLinearScanLevel >= 1) { |
9ec15d6914ca
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
610 TTY.println("----- linear-scan block order:"); |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
611 for (BlockBegin cur : linearScanOrder) { |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
612 TTY.print(String.format("%4d: B%02d loop: %2d depth: %2d", cur.linearScanNumber(), cur.blockID, cur.loopIndex(), cur.loopDepth())); |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
613 |
9ec15d6914ca
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
614 TTY.print(cur.isExceptionEntry() ? " ex" : " "); |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
615 TTY.print(cur.isCriticalEdgeSplit() ? " ce" : " "); |
9ec15d6914ca
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parents:
diff
changeset
|
616 TTY.print(cur.checkBlockFlag(BlockBegin.BlockFlag.LinearScanLoopHeader) ? " lh" : " "); |
9ec15d6914ca
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
617 TTY.print(cur.checkBlockFlag(BlockBegin.BlockFlag.LinearScanLoopEnd) ? " le" : " "); |
9ec15d6914ca
Pull over of compiler from maxine repository.
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parents:
diff
changeset
|
618 |
9ec15d6914ca
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parents:
diff
changeset
|
619 if (cur.dominator() != null) { |
9ec15d6914ca
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
620 TTY.print(" dom: B%d ", cur.dominator().blockID); |
9ec15d6914ca
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
621 } else { |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
622 TTY.print(" dom: null "); |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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|
623 } |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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|
624 |
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Pull over of compiler from maxine repository.
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parents:
diff
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625 if (cur.numberOfPreds() > 0) { |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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626 TTY.print(" preds: "); |
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Pull over of compiler from maxine repository.
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parents:
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627 for (int j = 0; j < cur.numberOfPreds(); j++) { |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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628 BlockBegin pred = cur.predAt(j); |
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Pull over of compiler from maxine repository.
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parents:
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629 TTY.print("B%d ", pred.blockID); |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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630 } |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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631 } |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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632 if (cur.numberOfSux() > 0) { |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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|
633 TTY.print(" sux: "); |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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634 for (int j = 0; j < cur.numberOfSux(); j++) { |
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Pull over of compiler from maxine repository.
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parents:
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635 BlockBegin sux = cur.suxAt(j); |
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|
636 TTY.print("B%d ", sux.blockID); |
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Pull over of compiler from maxine repository.
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637 } |
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638 } |
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parents:
diff
changeset
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639 if (cur.numberOfExceptionHandlers() > 0) { |
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parents:
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640 TTY.print(" ex: "); |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
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641 for (int j = 0; j < cur.numberOfExceptionHandlers(); j++) { |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
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642 BlockBegin ex = cur.exceptionHandlerAt(j); |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
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643 TTY.print("B%d ", ex.blockID); |
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Pull over of compiler from maxine repository.
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|
644 } |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
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diff
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|
645 } |
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646 TTY.println(); |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
647 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
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diff
changeset
|
648 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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|
649 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
650 |
2653
7c8ad40c1f88
No need for stateAfter on volatile field loads.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
2652
diff
changeset
|
651 private boolean verify() { |
2507
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652 assert linearScanOrder.size() == numBlocks : "wrong number of blocks in list"; |
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parents:
diff
changeset
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653 |
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parents:
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changeset
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654 if (C1XOptions.StressLinearScan) { |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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655 // blocks are scrambled when StressLinearScan is used |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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656 return true; |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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657 } |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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diff
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658 |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
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659 // check that all successors of a block have a higher linear-scan-number |
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Thomas Wuerthinger <thomas@wuerthinger.net>
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660 // and that all predecessors of a block have a lower linear-scan-number |
9ec15d6914ca
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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661 // (only backward branches of loops are ignored) |
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662 int i; |
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663 for (i = 0; i < linearScanOrder.size(); i++) { |
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parents:
diff
changeset
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664 BlockBegin cur = linearScanOrder.get(i); |
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parents:
diff
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|
665 |
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parents:
diff
changeset
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666 assert cur.linearScanNumber() == i : "incorrect linearScanNumber"; |
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parents:
diff
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667 assert cur.linearScanNumber() >= 0 && cur.linearScanNumber() == linearScanOrder.indexOf(cur) : "incorrect linearScanNumber"; |
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parents:
diff
changeset
|
668 |
2581
4a36a0bd6d18
added GraalGraph to classpath, Node as superclass of Value
Lukas Stadler <lukas.stadler@jku.at>
parents:
2516
diff
changeset
|
669 for (BlockBegin sux : cur.end().blockSuccessors()) { |
2507
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parents:
diff
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670 assert sux.linearScanNumber() >= 0 && sux.linearScanNumber() == linearScanOrder.indexOf(sux) : "incorrect linearScanNumber"; |
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parents:
diff
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671 if (!cur.checkBlockFlag(BlockBegin.BlockFlag.LinearScanLoopEnd)) { |
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parents:
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672 assert cur.linearScanNumber() < sux.linearScanNumber() : "invalid order"; |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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673 } |
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Pull over of compiler from maxine repository.
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parents:
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674 if (cur.loopDepth() == sux.loopDepth()) { |
9ec15d6914ca
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parents:
diff
changeset
|
675 assert cur.loopIndex() == sux.loopIndex() || sux.checkBlockFlag(BlockBegin.BlockFlag.LinearScanLoopHeader) : "successing blocks with same loop depth must have same loop index"; |
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parents:
diff
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|
676 } |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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|
677 } |
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Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
678 |
2581
4a36a0bd6d18
added GraalGraph to classpath, Node as superclass of Value
Lukas Stadler <lukas.stadler@jku.at>
parents:
2516
diff
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|
679 for (BlockBegin pred : cur.blockPredecessors()) { |
2507
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parents:
diff
changeset
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680 assert pred.linearScanNumber() >= 0 && pred.linearScanNumber() == linearScanOrder.indexOf(pred) : "incorrect linearScanNumber"; |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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681 if (!cur.checkBlockFlag(BlockBegin.BlockFlag.LinearScanLoopHeader)) { |
9ec15d6914ca
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parents:
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|
682 assert cur.linearScanNumber() > pred.linearScanNumber() : "invalid order"; |
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parents:
diff
changeset
|
683 } |
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Pull over of compiler from maxine repository.
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parents:
diff
changeset
|
684 if (cur.loopDepth() == pred.loopDepth()) { |
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parents:
diff
changeset
|
685 assert cur.loopIndex() == pred.loopIndex() || cur.checkBlockFlag(BlockBegin.BlockFlag.LinearScanLoopHeader) : "successing blocks with same loop depth must have same loop index"; |
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Pull over of compiler from maxine repository.
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parents:
diff
changeset
|
686 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
687 |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
688 assert cur.dominator().linearScanNumber() <= pred.linearScanNumber() : "dominator must be before predecessors"; |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
689 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
690 |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
691 // check dominator |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
692 if (i == 0) { |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
693 assert cur.dominator() == null : "first block has no dominator"; |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
694 } else { |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
695 assert cur.dominator() != null : "all but first block must have dominator"; |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
696 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
697 assert cur.numberOfPreds() != 1 || cur.dominator() == cur.predAt(0) || cur.isExceptionEntry() : "Single predecessor must also be dominator"; |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
698 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
699 |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
700 // check that all loops are continuous |
9ec15d6914ca
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
701 for (int loopIdx = 0; loopIdx < numLoops; loopIdx++) { |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
702 int blockIdx = 0; |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
703 assert !isBlockInLoop(loopIdx, linearScanOrder.get(blockIdx)) : "the first block must not be present in any loop"; |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
704 |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
705 // skip blocks before the loop |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
706 while (blockIdx < numBlocks && !isBlockInLoop(loopIdx, linearScanOrder.get(blockIdx))) { |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
707 blockIdx++; |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
708 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
709 // skip blocks of loop |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
710 while (blockIdx < numBlocks && isBlockInLoop(loopIdx, linearScanOrder.get(blockIdx))) { |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
711 blockIdx++; |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
712 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
713 // after the first non-loop block : there must not be another loop-block |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
714 while (blockIdx < numBlocks) { |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
715 assert !isBlockInLoop(loopIdx, linearScanOrder.get(blockIdx)) : "loop not continuous in linear-scan order"; |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
716 blockIdx++; |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
717 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
718 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
719 |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
720 return true; |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
721 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
722 } |