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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/IntegerSwitchNode.java @ 14888:f6630873316b

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Rename NodeLIRGenerator (and related classes and interfaces) to NodeLIRBuilder.
author Josef Eisl <josef.eisl@jku.at>
date Mon, 31 Mar 2014 10:03:32 +0200
parents 47e4d2e01c6e
children d5a1206e1923
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 package com.oracle.graal.nodes.extended;
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24
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25 import java.util.*;
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26
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27 import com.oracle.graal.api.meta.*;
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28 import com.oracle.graal.graph.spi.*;
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29 import com.oracle.graal.nodes.*;
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30 import com.oracle.graal.nodes.spi.*;
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31 import com.oracle.graal.nodes.type.*;
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32 import com.oracle.graal.nodes.util.*;
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33
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34 /**
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35 * The {@code IntegerSwitchNode} represents a switch on integer keys, with a sorted array of key
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36 * values. The actual implementation of the switch will be decided by the backend.
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37 */
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38 public final class IntegerSwitchNode extends SwitchNode implements LIRLowerable, Simplifiable {
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39
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40 private final int[] keys;
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41
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42 /**
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43 * Constructs a integer switch instruction. The keyProbabilities and keySuccessors array contain
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44 * key.length + 1 entries, the last entry describes the default (fall through) case.
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45 *
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46 * @param value the instruction producing the value being switched on
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47 * @param successors the list of successors
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48 * @param keys the sorted list of keys
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49 * @param keyProbabilities the probabilities of the keys
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50 * @param keySuccessors the successor index for each key
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51 */
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52 public IntegerSwitchNode(ValueNode value, AbstractBeginNode[] successors, int[] keys, double[] keyProbabilities, int[] keySuccessors) {
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53 super(value, successors, keySuccessors, keyProbabilities);
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54 assert keySuccessors.length == keys.length + 1;
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55 assert keySuccessors.length == keyProbabilities.length;
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56 this.keys = keys;
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57 assert assertValues();
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58 assert assertSorted();
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59 }
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60
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61 private boolean assertSorted() {
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62 for (int i = 1; i < keys.length; i++) {
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63 assert keys[i - 1] < keys[i];
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64 }
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65 return true;
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66 }
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67
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68 /**
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69 * Constructs a integer switch instruction. The keyProbabilities and keySuccessors array contain
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70 * key.length + 1 entries, the last entry describes the default (fall through) case.
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71 *
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72 * @param value the instruction producing the value being switched on
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73 * @param successorCount the number of successors
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74 * @param keys the sorted list of keys
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75 * @param keyProbabilities the probabilities of the keys
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76 * @param keySuccessors the successor index for each key
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77 */
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78 public IntegerSwitchNode(ValueNode value, int successorCount, int[] keys, double[] keyProbabilities, int[] keySuccessors) {
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79 this(value, new AbstractBeginNode[successorCount], keys, keyProbabilities, keySuccessors);
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80 }
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81
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82 @Override
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83 public boolean isSorted() {
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84 return true;
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85 }
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86
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87 /**
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88 * Gets the key at the specified index.
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89 *
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90 * @param i the index
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91 * @return the key at that index
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92 */
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93 @Override
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94 public Constant keyAt(int i) {
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95 return Constant.forInt(keys[i]);
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96 }
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97
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98 @Override
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99 public int keyCount() {
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100 return keys.length;
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101 }
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102
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103 @Override
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104 public void generate(NodeLIRBuiderTool gen) {
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105 gen.emitSwitch(this);
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106 }
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107
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108 @Override
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109 public void simplify(SimplifierTool tool) {
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110 if (blockSuccessorCount() == 1) {
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111 tool.addToWorkList(defaultSuccessor());
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112 graph().removeSplitPropagate(this, defaultSuccessor());
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113 } else if (value() instanceof ConstantNode) {
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114 int constant = value().asConstant().asInt();
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115
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116 int survivingEdge = keySuccessorIndex(keyCount());
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117 for (int i = 0; i < keyCount(); i++) {
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118 if (keys[i] == constant) {
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119 survivingEdge = keySuccessorIndex(i);
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120 }
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121 }
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122 for (int i = 0; i < blockSuccessorCount(); i++) {
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123 if (i != survivingEdge) {
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124 tool.deleteBranch(blockSuccessor(i));
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125 }
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126 }
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127 tool.addToWorkList(blockSuccessor(survivingEdge));
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128 graph().removeSplit(this, blockSuccessor(survivingEdge));
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129 } else if (value().stamp() instanceof IntegerStamp) {
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130 IntegerStamp stamp = (IntegerStamp) value().stamp();
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131 if (!stamp.isUnrestricted()) {
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132 int validKeys = 0;
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133 for (int i = 0; i < keyCount(); i++) {
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134 if (stamp.contains(keys[i])) {
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135 validKeys++;
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136 }
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137 }
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138 if (validKeys == 0) {
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139 tool.addToWorkList(defaultSuccessor());
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140 graph().removeSplitPropagate(this, defaultSuccessor());
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141 } else if (validKeys != keys.length) {
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142 ArrayList<AbstractBeginNode> newSuccessors = new ArrayList<>(blockSuccessorCount());
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143 int[] newKeys = new int[validKeys];
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144 int[] newKeySuccessors = new int[validKeys + 1];
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145 double[] newKeyProbabilities = new double[validKeys + 1];
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146 double totalProbability = 0;
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147 int current = 0;
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148 for (int i = 0; i < keyCount() + 1; i++) {
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149 if (i == keyCount() || stamp.contains(keys[i])) {
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150 int index = newSuccessors.indexOf(keySuccessor(i));
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151 if (index == -1) {
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152 index = newSuccessors.size();
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153 newSuccessors.add(keySuccessor(i));
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154 }
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155 newKeySuccessors[current] = index;
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156 if (i < keyCount()) {
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157 newKeys[current] = keys[i];
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158 }
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159 newKeyProbabilities[current] = keyProbability(i);
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160 totalProbability += keyProbability(i);
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161 current++;
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162 }
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163 }
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164 if (totalProbability > 0) {
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165 for (int i = 0; i < current; i++) {
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166 newKeyProbabilities[i] /= totalProbability;
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167 }
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168 } else {
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169 for (int i = 0; i < current; i++) {
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170 newKeyProbabilities[i] = 1.0 / current;
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171 }
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172 }
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173
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174 for (int i = 0; i < blockSuccessorCount(); i++) {
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175 AbstractBeginNode successor = blockSuccessor(i);
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176 if (!newSuccessors.contains(successor)) {
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177 tool.deleteBranch(successor);
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178 }
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179 setBlockSuccessor(i, null);
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180 }
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181
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182 AbstractBeginNode[] successorsArray = newSuccessors.toArray(new AbstractBeginNode[newSuccessors.size()]);
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183 IntegerSwitchNode newSwitch = graph().add(new IntegerSwitchNode(value(), successorsArray, newKeys, newKeyProbabilities, newKeySuccessors));
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184 ((FixedWithNextNode) predecessor()).setNext(newSwitch);
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185 GraphUtil.killWithUnusedFloatingInputs(this);
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186 }
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187 }
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188 }
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189 }
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190 }