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annotate graal/com.oracle.graal.lir/src/com/oracle/graal/lir/alloc/lsra/OptimizeSpillPosition.java @ 21322:73942ac6e650

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LinearScan: outsource OptimizeSpillPosition.
author Josef Eisl <josef.eisl@jku.at>
date Tue, 12 May 2015 10:57:59 +0200
parents
children b8dcf353b822
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21322
73942ac6e650 LinearScan: outsource OptimizeSpillPosition.
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1 /*
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2 * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.lir.alloc.lsra;
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24
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25 import static com.oracle.graal.api.code.ValueUtil.*;
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26 import static com.oracle.graal.compiler.common.cfg.AbstractControlFlowGraph.*;
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27
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28 import java.util.*;
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29
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30 import com.oracle.graal.api.code.*;
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31 import com.oracle.graal.api.meta.*;
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32 import com.oracle.graal.compiler.common.cfg.*;
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33 import com.oracle.graal.debug.*;
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34 import com.oracle.graal.lir.*;
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35 import com.oracle.graal.lir.LIRInstruction.OperandMode;
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36 import com.oracle.graal.lir.alloc.lsra.Interval.SpillState;
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37 import com.oracle.graal.lir.gen.*;
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38 import com.oracle.graal.lir.gen.LIRGeneratorTool.SpillMoveFactory;
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39 import com.oracle.graal.lir.phases.*;
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40
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41 final class OptimizeSpillPosition extends AllocationPhase {
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42
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43 private static final DebugMetric betterSpillPos = Debug.metric("BetterSpillPosition");
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44 private static final DebugMetric betterSpillPosWithLowerProbability = Debug.metric("BetterSpillPositionWithLowerProbability");
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45
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46 private final LinearScan allocator;
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47
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48 OptimizeSpillPosition(LinearScan allocator) {
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49 this.allocator = allocator;
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50 }
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51
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52 @Override
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53 protected <B extends AbstractBlockBase<B>> void run(TargetDescription target, LIRGenerationResult lirGenRes, List<B> codeEmittingOrder, List<B> linearScanOrder, SpillMoveFactory spillMoveFactory) {
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54 optimizeSpillPosition();
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55 allocator.printIntervals("After optimize spill position");
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56 }
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57
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58 private void optimizeSpillPosition() {
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59 LIRInsertionBuffer[] insertionBuffers = new LIRInsertionBuffer[allocator.ir.linearScanOrder().size()];
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60 for (Interval interval : allocator.intervals) {
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61 if (interval != null && interval.isSplitParent() && interval.spillState() == SpillState.SpillInDominator) {
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62 AbstractBlockBase<?> defBlock = allocator.blockForId(interval.spillDefinitionPos());
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63 AbstractBlockBase<?> spillBlock = null;
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64 Interval firstSpillChild = null;
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65 try (Indent indent = Debug.logAndIndent("interval %s (%s)", interval, defBlock)) {
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66 for (Interval splitChild : interval.getSplitChildren()) {
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67 if (isStackSlotValue(splitChild.location())) {
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68 if (firstSpillChild == null || splitChild.from() < firstSpillChild.from()) {
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69 firstSpillChild = splitChild;
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70 } else {
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71 assert firstSpillChild.from() < splitChild.from();
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72 }
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73 // iterate all blocks where the interval has use positions
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74 for (AbstractBlockBase<?> splitBlock : blocksForInterval(splitChild)) {
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75 if (dominates(defBlock, splitBlock)) {
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76 if (Debug.isLogEnabled()) {
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77 Debug.log("Split interval %s, block %s", splitChild, splitBlock);
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78 }
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79 if (spillBlock == null) {
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80 spillBlock = splitBlock;
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81 } else {
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82 spillBlock = commonDominator(spillBlock, splitBlock);
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83 assert spillBlock != null;
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84 }
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85 }
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86 }
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87 }
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88 }
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89 if (spillBlock == null) {
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90 // no spill interval
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91 interval.setSpillState(SpillState.StoreAtDefinition);
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92 } else {
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93 // move out of loops
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94 if (defBlock.getLoopDepth() < spillBlock.getLoopDepth()) {
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95 spillBlock = moveSpillOutOfLoop(defBlock, spillBlock);
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96 }
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97
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98 /*
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99 * If the spill block is the begin of the first split child (aka the value
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100 * is on the stack) spill in the dominator.
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101 */
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102 assert firstSpillChild != null;
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103 if (!defBlock.equals(spillBlock) && spillBlock.equals(allocator.blockForId(firstSpillChild.from()))) {
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104 AbstractBlockBase<?> dom = spillBlock.getDominator();
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105 if (Debug.isLogEnabled()) {
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106 Debug.log("Spill block (%s) is the beginning of a spill child -> use dominator (%s)", spillBlock, dom);
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107 }
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108 spillBlock = dom;
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109 }
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110
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111 if (!defBlock.equals(spillBlock)) {
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112 assert dominates(defBlock, spillBlock);
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113 betterSpillPos.increment();
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114 if (Debug.isLogEnabled()) {
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115 Debug.log("Better spill position found (Block %s)", spillBlock);
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116 }
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117
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118 if (defBlock.probability() <= spillBlock.probability()) {
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119 // better spill block has the same probability -> do nothing
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120 interval.setSpillState(SpillState.StoreAtDefinition);
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121 } else {
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122 LIRInsertionBuffer insertionBuffer = insertionBuffers[spillBlock.getId()];
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123 if (insertionBuffer == null) {
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124 insertionBuffer = new LIRInsertionBuffer();
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125 insertionBuffers[spillBlock.getId()] = insertionBuffer;
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126 insertionBuffer.init(allocator.ir.getLIRforBlock(spillBlock));
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127 }
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128 int spillOpId = allocator.getFirstLirInstructionId(spillBlock);
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129 // insert spill move
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130 AllocatableValue fromLocation = interval.getSplitChildAtOpId(spillOpId, OperandMode.DEF, allocator).location();
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Josef Eisl <josef.eisl@jku.at>
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131 AllocatableValue toLocation = LinearScan.canonicalSpillOpr(interval);
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Josef Eisl <josef.eisl@jku.at>
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132 LIRInstruction move = allocator.getSpillMoveFactory().createMove(toLocation, fromLocation);
73942ac6e650 LinearScan: outsource OptimizeSpillPosition.
Josef Eisl <josef.eisl@jku.at>
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133 move.setId(LinearScan.DOMINATOR_SPILL_MOVE_ID);
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Josef Eisl <josef.eisl@jku.at>
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134 /*
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Josef Eisl <josef.eisl@jku.at>
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135 * We can use the insertion buffer directly because we always insert
73942ac6e650 LinearScan: outsource OptimizeSpillPosition.
Josef Eisl <josef.eisl@jku.at>
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136 * at position 1.
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Josef Eisl <josef.eisl@jku.at>
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137 */
73942ac6e650 LinearScan: outsource OptimizeSpillPosition.
Josef Eisl <josef.eisl@jku.at>
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138 insertionBuffer.append(1, move);
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Josef Eisl <josef.eisl@jku.at>
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139
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Josef Eisl <josef.eisl@jku.at>
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140 betterSpillPosWithLowerProbability.increment();
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Josef Eisl <josef.eisl@jku.at>
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141 interval.setSpillDefinitionPos(spillOpId);
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Josef Eisl <josef.eisl@jku.at>
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142 }
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Josef Eisl <josef.eisl@jku.at>
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143 } else {
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Josef Eisl <josef.eisl@jku.at>
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144 // definition is the best choice
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Josef Eisl <josef.eisl@jku.at>
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145 interval.setSpillState(SpillState.StoreAtDefinition);
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Josef Eisl <josef.eisl@jku.at>
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146 }
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Josef Eisl <josef.eisl@jku.at>
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147 }
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Josef Eisl <josef.eisl@jku.at>
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148 }
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Josef Eisl <josef.eisl@jku.at>
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149 }
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Josef Eisl <josef.eisl@jku.at>
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150 }
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Josef Eisl <josef.eisl@jku.at>
parents:
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151 for (LIRInsertionBuffer insertionBuffer : insertionBuffers) {
73942ac6e650 LinearScan: outsource OptimizeSpillPosition.
Josef Eisl <josef.eisl@jku.at>
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152 if (insertionBuffer != null) {
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Josef Eisl <josef.eisl@jku.at>
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153 assert insertionBuffer.initialized() : "Insertion buffer is nonnull but not initialized!";
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Josef Eisl <josef.eisl@jku.at>
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154 insertionBuffer.finish();
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Josef Eisl <josef.eisl@jku.at>
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155 }
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Josef Eisl <josef.eisl@jku.at>
parents:
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156 }
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Josef Eisl <josef.eisl@jku.at>
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157 }
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Josef Eisl <josef.eisl@jku.at>
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158
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Josef Eisl <josef.eisl@jku.at>
parents:
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159 /**
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Josef Eisl <josef.eisl@jku.at>
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160 * Iterate over all {@link AbstractBlockBase blocks} of an interval.
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Josef Eisl <josef.eisl@jku.at>
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161 */
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Josef Eisl <josef.eisl@jku.at>
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162 private class IntervalBlockIterator implements Iterator<AbstractBlockBase<?>> {
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Josef Eisl <josef.eisl@jku.at>
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163
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Josef Eisl <josef.eisl@jku.at>
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164 Range range;
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Josef Eisl <josef.eisl@jku.at>
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165 AbstractBlockBase<?> block;
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166
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Josef Eisl <josef.eisl@jku.at>
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167 public IntervalBlockIterator(Interval interval) {
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Josef Eisl <josef.eisl@jku.at>
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168 range = interval.first();
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Josef Eisl <josef.eisl@jku.at>
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169 block = allocator.blockForId(range.from);
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Josef Eisl <josef.eisl@jku.at>
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170 }
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Josef Eisl <josef.eisl@jku.at>
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171
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Josef Eisl <josef.eisl@jku.at>
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172 public AbstractBlockBase<?> next() {
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Josef Eisl <josef.eisl@jku.at>
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173 AbstractBlockBase<?> currentBlock = block;
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Josef Eisl <josef.eisl@jku.at>
parents:
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174 int nextBlockIndex = block.getLinearScanNumber() + 1;
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Josef Eisl <josef.eisl@jku.at>
parents:
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175 if (nextBlockIndex < allocator.sortedBlocks.size()) {
73942ac6e650 LinearScan: outsource OptimizeSpillPosition.
Josef Eisl <josef.eisl@jku.at>
parents:
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176 block = allocator.sortedBlocks.get(nextBlockIndex);
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Josef Eisl <josef.eisl@jku.at>
parents:
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177 if (range.to <= allocator.getFirstLirInstructionId(block)) {
73942ac6e650 LinearScan: outsource OptimizeSpillPosition.
Josef Eisl <josef.eisl@jku.at>
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178 range = range.next;
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Josef Eisl <josef.eisl@jku.at>
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179 if (range == Range.EndMarker) {
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Josef Eisl <josef.eisl@jku.at>
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180 block = null;
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Josef Eisl <josef.eisl@jku.at>
parents:
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181 } else {
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Josef Eisl <josef.eisl@jku.at>
parents:
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182 block = allocator.blockForId(range.from);
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Josef Eisl <josef.eisl@jku.at>
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183 }
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Josef Eisl <josef.eisl@jku.at>
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184 }
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Josef Eisl <josef.eisl@jku.at>
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185 } else {
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Josef Eisl <josef.eisl@jku.at>
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186 block = null;
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Josef Eisl <josef.eisl@jku.at>
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187 }
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Josef Eisl <josef.eisl@jku.at>
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188 return currentBlock;
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Josef Eisl <josef.eisl@jku.at>
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189 }
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Josef Eisl <josef.eisl@jku.at>
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190
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Josef Eisl <josef.eisl@jku.at>
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191 public boolean hasNext() {
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Josef Eisl <josef.eisl@jku.at>
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192 return block != null;
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Josef Eisl <josef.eisl@jku.at>
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193 }
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Josef Eisl <josef.eisl@jku.at>
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194 }
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Josef Eisl <josef.eisl@jku.at>
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195
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Josef Eisl <josef.eisl@jku.at>
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196 private Iterable<AbstractBlockBase<?>> blocksForInterval(Interval interval) {
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Josef Eisl <josef.eisl@jku.at>
parents:
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197 return new Iterable<AbstractBlockBase<?>>() {
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Josef Eisl <josef.eisl@jku.at>
parents:
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198 public Iterator<AbstractBlockBase<?>> iterator() {
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Josef Eisl <josef.eisl@jku.at>
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199 return new IntervalBlockIterator(interval);
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Josef Eisl <josef.eisl@jku.at>
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200 }
73942ac6e650 LinearScan: outsource OptimizeSpillPosition.
Josef Eisl <josef.eisl@jku.at>
parents:
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201 };
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Josef Eisl <josef.eisl@jku.at>
parents:
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202 }
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Josef Eisl <josef.eisl@jku.at>
parents:
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203
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Josef Eisl <josef.eisl@jku.at>
parents:
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204 private static AbstractBlockBase<?> moveSpillOutOfLoop(AbstractBlockBase<?> defBlock, AbstractBlockBase<?> spillBlock) {
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Josef Eisl <josef.eisl@jku.at>
parents:
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205 int defLoopDepth = defBlock.getLoopDepth();
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Josef Eisl <josef.eisl@jku.at>
parents:
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206 for (AbstractBlockBase<?> block = spillBlock.getDominator(); !defBlock.equals(block); block = block.getDominator()) {
73942ac6e650 LinearScan: outsource OptimizeSpillPosition.
Josef Eisl <josef.eisl@jku.at>
parents:
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207 assert block != null : "spill block not dominated by definition block?";
73942ac6e650 LinearScan: outsource OptimizeSpillPosition.
Josef Eisl <josef.eisl@jku.at>
parents:
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208 if (block.getLoopDepth() <= defLoopDepth) {
73942ac6e650 LinearScan: outsource OptimizeSpillPosition.
Josef Eisl <josef.eisl@jku.at>
parents:
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209 assert block.getLoopDepth() == defLoopDepth : "Cannot spill an interval outside of the loop where it is defined!";
73942ac6e650 LinearScan: outsource OptimizeSpillPosition.
Josef Eisl <josef.eisl@jku.at>
parents:
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210 return block;
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Josef Eisl <josef.eisl@jku.at>
parents:
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211 }
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Josef Eisl <josef.eisl@jku.at>
parents:
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212 }
73942ac6e650 LinearScan: outsource OptimizeSpillPosition.
Josef Eisl <josef.eisl@jku.at>
parents:
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213 return defBlock;
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Josef Eisl <josef.eisl@jku.at>
parents:
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214 }
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Josef Eisl <josef.eisl@jku.at>
parents:
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215 }