Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/ir/If.java @ 2834:bfce42cd9c07
Graph duplication now passes all tests
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 31 May 2011 13:34:52 +0200 |
parents | bd17ac598c6e |
children | 14708c03abba |
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.cri.ci.*; |
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29 |
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30 /** |
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31 * The {@code If} instruction represents a branch that can go one of two directions |
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32 * depending on the outcome of a comparison. |
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33 */ |
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34 public final class If extends BlockEnd { |
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35 |
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36 private static final int INPUT_COUNT = 2; |
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37 private static final int INPUT_X = 0; |
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38 private static final int INPUT_Y = 1; |
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39 |
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40 private static final int SUCCESSOR_COUNT = 0; |
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41 |
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42 @Override |
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43 protected int inputCount() { |
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44 return super.inputCount() + INPUT_COUNT; |
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45 } |
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46 |
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47 @Override |
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48 protected int successorCount() { |
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49 return super.successorCount() + SUCCESSOR_COUNT; |
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50 } |
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51 |
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52 /** |
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53 * The instruction that produces the first input to this comparison. |
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54 */ |
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55 public Value x() { |
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56 return (Value) inputs().get(super.inputCount() + INPUT_X); |
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57 } |
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58 |
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59 public Value setX(Value n) { |
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60 return (Value) inputs().set(super.inputCount() + INPUT_X, n); |
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61 } |
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62 |
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63 /** |
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64 * The instruction that produces the second input to this comparison. |
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65 */ |
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66 public Value y() { |
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67 return (Value) inputs().get(super.inputCount() + INPUT_Y); |
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68 } |
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69 |
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70 public Value setY(Value n) { |
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71 return (Value) inputs().set(super.inputCount() + INPUT_Y, n); |
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72 } |
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73 |
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74 Condition condition; |
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75 boolean unorderedIsTrue; |
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76 |
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77 /** |
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78 * Constructs a new If instruction. |
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79 * @param x the instruction producing the first input to the instruction |
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80 * @param condition the condition (comparison operation) |
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81 * @param y the instruction that produces the second input to this instruction |
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82 * @param graph |
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83 */ |
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84 public If(Value x, Condition condition, Value y, Graph graph) { |
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85 super(CiKind.Illegal, 2, INPUT_COUNT, SUCCESSOR_COUNT, graph); |
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86 assert (x == null && y == null) || Util.archKindsEqual(x, y); |
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87 this.condition = condition; |
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88 setX(x); |
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89 setY(y); |
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90 } |
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91 |
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92 /** |
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93 * Gets the condition (comparison operation) for this instruction. |
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94 * @return the condition |
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95 */ |
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96 public Condition condition() { |
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97 return condition; |
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98 } |
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99 |
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100 /** |
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101 * Checks whether unordered inputs mean true or false. |
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102 * @return {@code true} if unordered inputs produce true |
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103 */ |
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104 public boolean unorderedIsTrue() { |
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105 return unorderedIsTrue; |
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106 } |
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107 |
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108 /** |
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109 * Gets the block corresponding to the true successor. |
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110 * @return the true successor |
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111 */ |
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112 public Instruction trueSuccessor() { |
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113 return blockSuccessor(0); |
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114 } |
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115 |
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116 /** |
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117 * Gets the block corresponding to the false successor. |
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118 * @return the false successor |
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119 */ |
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120 public Instruction falseSuccessor() { |
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121 return blockSuccessor(1); |
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122 } |
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123 |
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124 /** |
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125 * Gets the block corresponding to the specified outcome of the branch. |
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126 * @param istrue {@code true} if the true successor is requested, {@code false} otherwise |
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127 * @return the corresponding successor |
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128 */ |
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129 public Instruction successor(boolean istrue) { |
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130 return blockSuccessor(istrue ? 0 : 1); |
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131 } |
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132 |
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133 /** |
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134 * Gets the successor of this instruction for the unordered case. |
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135 * @return the successor for unordered inputs |
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136 */ |
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137 public Instruction unorderedSuccessor() { |
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138 return successor(unorderedIsTrue()); |
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139 } |
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140 |
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141 /** |
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142 * Swaps the operands to this if and reverses the condition (e.g. > goes to <=). |
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143 * @see Condition#mirror() |
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144 */ |
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145 public void swapOperands() { |
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146 condition = condition.mirror(); |
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147 Value t = x(); |
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148 setX(y()); |
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149 setY(t); |
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150 } |
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151 |
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152 /** |
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153 * Swaps the successor blocks to this if and negates the condition (e.g. == goes to !=) |
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154 * @see Condition#negate() |
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155 */ |
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156 public void swapSuccessors() { |
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157 unorderedIsTrue = !unorderedIsTrue; |
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158 condition = condition.negate(); |
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159 Instruction t = blockSuccessor(0); |
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160 Instruction f = blockSuccessor(1); |
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161 setBlockSuccessor(0, f); |
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162 setBlockSuccessor(1, t); |
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163 } |
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164 |
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165 @Override |
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166 public void accept(ValueVisitor v) { |
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167 v.visitIf(this); |
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168 } |
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169 |
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170 @Override |
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171 public void print(LogStream out) { |
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172 out.print("if "). |
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173 print(x()). |
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174 print(' '). |
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175 print(condition().operator). |
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176 print(' '). |
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177 print(y()). |
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178 print(" then "). |
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179 print(blockSuccessors().get(0)). |
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180 print(" else "). |
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181 print(blockSuccessors().get(1)); |
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182 } |
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183 |
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184 @Override |
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185 public String shortName() { |
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186 return "If " + condition.operator; |
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187 } |
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188 |
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189 @Override |
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190 public Node copy(Graph into) { |
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191 If x = new If(null, condition, null, into); |
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192 x.unorderedIsTrue = unorderedIsTrue; |
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193 x.setNonNull(isNonNull()); |
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194 return x; |
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195 } |
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196 } |