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annotate graal/GraalCompiler/src/com/sun/c1x/ir/If.java @ 2755:80b024e75b29

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small fix for dead blocks
author Lukas Stadler <lukas.stadler@jku.at>
date Fri, 20 May 2011 14:50:04 +0200
parents 6048da340364
children ca31e84ff154
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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 package com.sun.c1x.ir;
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24
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25 import com.oracle.graal.graph.*;
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26 import com.sun.c1x.debug.*;
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27 import com.sun.c1x.util.*;
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28 import com.sun.c1x.value.*;
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29 import com.sun.cri.ci.*;
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30
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31 /**
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32 * The {@code If} instruction represents a branch that can go one of two directions
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33 * depending on the outcome of a comparison.
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34 */
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35 public final class If extends BlockEnd {
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36
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37 private static final int INPUT_COUNT = 2;
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38 private static final int INPUT_X = 0;
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39 private static final int INPUT_Y = 1;
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40
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41 private static final int SUCCESSOR_COUNT = 0;
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42
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43 @Override
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44 protected int inputCount() {
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45 return super.inputCount() + INPUT_COUNT;
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46 }
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47
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48 @Override
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49 protected int successorCount() {
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50 return super.successorCount() + SUCCESSOR_COUNT;
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51 }
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52
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53 /**
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54 * The instruction that produces the first input to this comparison.
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55 */
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56 public Value x() {
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57 return (Value) inputs().get(super.inputCount() + INPUT_X);
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58 }
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59
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60 public Value setX(Value n) {
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61 return (Value) inputs().set(super.inputCount() + INPUT_X, n);
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62 }
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63
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64 /**
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65 * The instruction that produces the second input to this comparison.
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66 */
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67 public Value y() {
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68 return (Value) inputs().get(super.inputCount() + INPUT_Y);
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69 }
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70
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71 public Value setY(Value n) {
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72 return (Value) inputs().set(super.inputCount() + INPUT_Y, n);
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73 }
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74
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75 Condition condition;
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76 boolean unorderedIsTrue;
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77
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78 /**
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79 * Constructs a new If instruction.
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80 * @param x the instruction producing the first input to the instruction
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81 * @param cond the condition (comparison operation)
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82 * @param y the instruction that produces the second input to this instruction
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83 * @param trueSucc the block representing the true successor
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84 * @param falseSucc the block representing the false successor
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85 * @param stateAfter the state before the branch but after the input values have been popped
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86 * @param isSafepoint {@code true} if this branch should be considered a safepoint
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87 * @param graph
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88 */
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89 public If(Value x, Condition cond, Value y, Instruction trueSucc, Instruction falseSucc, FrameState stateAfter, Graph graph) {
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90 super(CiKind.Illegal, stateAfter, 2, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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91 assert Util.archKindsEqual(x, y);
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92 condition = cond;
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93 setX(x);
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94 setY(y);
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95 setBlockSuccessor(0, trueSucc);
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96 setBlockSuccessor(1, falseSucc);
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97 }
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98
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99 /**
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100 * Gets the condition (comparison operation) for this instruction.
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101 * @return the condition
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102 */
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103 public Condition condition() {
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104 return condition;
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105 }
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106
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107 /**
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108 * Checks whether unordered inputs mean true or false.
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109 * @return {@code true} if unordered inputs produce true
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110 */
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111 public boolean unorderedIsTrue() {
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112 return unorderedIsTrue;
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113 }
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114
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115 /**
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116 * Gets the block corresponding to the true successor.
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117 * @return the true successor
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118 */
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119 public Instruction trueSuccessor() {
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120 return blockSuccessor(0);
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121 }
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122
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123 /**
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124 * Gets the block corresponding to the false successor.
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125 * @return the false successor
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126 */
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127 public Instruction falseSuccessor() {
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128 return blockSuccessor(1);
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129 }
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130
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131 /**
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132 * Gets the block corresponding to the specified outcome of the branch.
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133 * @param istrue {@code true} if the true successor is requested, {@code false} otherwise
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134 * @return the corresponding successor
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135 */
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136 public Instruction successor(boolean istrue) {
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137 return blockSuccessor(istrue ? 0 : 1);
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138 }
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139
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140 /**
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141 * Gets the successor of this instruction for the unordered case.
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142 * @return the successor for unordered inputs
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143 */
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144 public Instruction unorderedSuccessor() {
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145 return successor(unorderedIsTrue());
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146 }
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147
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148 /**
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149 * Swaps the operands to this if and reverses the condition (e.g. > goes to <=).
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150 * @see Condition#mirror()
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151 */
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152 public void swapOperands() {
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153 condition = condition.mirror();
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154 Value t = x();
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155 setX(y());
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156 setY(t);
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157 }
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158
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159 /**
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160 * Swaps the successor blocks to this if and negates the condition (e.g. == goes to !=)
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161 * @see Condition#negate()
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162 */
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163 public void swapSuccessors() {
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164 unorderedIsTrue = !unorderedIsTrue;
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165 condition = condition.negate();
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166 Instruction t = blockSuccessor(0);
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167 Instruction f = blockSuccessor(1);
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168 setBlockSuccessor(0, f);
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169 setBlockSuccessor(1, t);
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170 }
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171
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172 @Override
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173 public void accept(ValueVisitor v) {
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174 v.visitIf(this);
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175 }
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176
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177 @Override
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178 public void print(LogStream out) {
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179 out.print("if ").
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180 print(x()).
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181 print(' ').
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182 print(condition().operator).
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183 print(' ').
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184 print(y()).
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185 print(" then B").
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186 print(blockSuccessors().get(0).blockID).
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187 print(" else B").
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188 print(blockSuccessors().get(1).blockID);
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189 }
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190
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191 @Override
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192 public String shortName() {
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193 return "If " + condition.operator;
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194 }
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195
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196
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197 }