Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/CompareNode.java @ 19584:f7c6b33489c9
Merge
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Mon, 23 Feb 2015 16:23:23 -0800 |
parents | 8fc336a04d77 b017118b412b |
children | b92530cb27df |
rev | line source |
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1 /* |
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2 * Copyright (c) 2011, 2014, 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.calc; |
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24 |
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25 import com.oracle.graal.api.meta.*; |
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26 import com.oracle.graal.compiler.common.*; |
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27 import com.oracle.graal.compiler.common.calc.*; |
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28 import com.oracle.graal.compiler.common.type.*; |
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29 import com.oracle.graal.graph.*; |
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30 import com.oracle.graal.graph.spi.*; |
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31 import com.oracle.graal.nodeinfo.*; |
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32 import com.oracle.graal.nodes.*; |
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33 |
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34 /* TODO (thomaswue/gdub) For high-level optimization purpose the compare node should be a boolean *value* (it is currently only a helper node) |
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35 * But in the back-end the comparison should not always be materialized (for example in x86 the comparison result will not be in a register but in a flag) |
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36 * |
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37 * Compare should probably be made a value (so that it can be canonicalized for example) and in later stages some Compare usage should be transformed |
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38 * into variants that do not materialize the value (CompareIf, CompareGuard...) |
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39 */ |
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40 @NodeInfo |
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41 public abstract class CompareNode extends BinaryOpLogicNode { |
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42 |
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43 public static final NodeClass<CompareNode> TYPE = NodeClass.create(CompareNode.class); |
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44 protected final Condition condition; |
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45 protected final boolean unorderedIsTrue; |
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46 |
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47 /** |
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48 * Constructs a new Compare instruction. |
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49 * |
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50 * @param x the instruction producing the first input to the instruction |
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51 * @param y the instruction that produces the second input to this instruction |
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52 */ |
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53 protected CompareNode(NodeClass<? extends CompareNode> c, Condition condition, boolean unorderedIsTrue, ValueNode x, ValueNode y) { |
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54 super(c, x, y); |
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55 this.condition = condition; |
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56 this.unorderedIsTrue = unorderedIsTrue; |
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57 } |
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58 |
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59 /** |
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60 * Gets the condition (comparison operation) for this instruction. |
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61 * |
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62 * @return the condition |
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63 */ |
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64 public final Condition condition() { |
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65 return condition; |
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66 } |
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67 |
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68 /** |
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69 * Checks whether unordered inputs mean true or false (only applies to float operations). |
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70 * |
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71 * @return {@code true} if unordered inputs produce true |
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72 */ |
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73 public final boolean unorderedIsTrue() { |
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74 return this.unorderedIsTrue; |
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75 } |
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76 |
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77 private ValueNode optimizeConditional(Constant constant, ConditionalNode conditionalNode, ConstantReflectionProvider constantReflection, Condition cond) { |
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78 Constant trueConstant = conditionalNode.trueValue().asConstant(); |
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79 Constant falseConstant = conditionalNode.falseValue().asConstant(); |
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80 |
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81 if (falseConstant != null && trueConstant != null && constantReflection != null) { |
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82 boolean trueResult = cond.foldCondition(trueConstant, constant, constantReflection, unorderedIsTrue()); |
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83 boolean falseResult = cond.foldCondition(falseConstant, constant, constantReflection, unorderedIsTrue()); |
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84 |
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85 if (trueResult == falseResult) { |
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86 return LogicConstantNode.forBoolean(trueResult); |
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87 } else { |
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88 if (trueResult) { |
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89 assert falseResult == false; |
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90 return conditionalNode.condition(); |
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91 } else { |
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92 assert falseResult == true; |
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93 return LogicNegationNode.create(conditionalNode.condition()); |
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94 |
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95 } |
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96 } |
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97 } |
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98 return this; |
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99 } |
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100 |
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101 protected ValueNode optimizeNormalizeCmp(Constant constant, NormalizeCompareNode normalizeNode, boolean mirrored) { |
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102 throw new GraalInternalError("NormalizeCompareNode connected to %s (%s %s %s)", this, constant, normalizeNode, mirrored); |
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103 } |
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104 |
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105 @Override |
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106 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) { |
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107 ConstantReflectionProvider constantReflection = tool.getConstantReflection(); |
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108 LogicNode constantCondition = tryConstantFold(condition(), forX, forY, constantReflection, unorderedIsTrue()); |
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109 if (constantCondition != null) { |
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110 return constantCondition; |
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111 } |
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112 ValueNode result; |
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113 if (forX.isConstant()) { |
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114 if ((result = canonicalizeSymmetricConstant(tool, forX.asConstant(), forY, true)) != this) { |
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115 return result; |
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116 } |
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117 } else if (forY.isConstant()) { |
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118 if ((result = canonicalizeSymmetricConstant(tool, forY.asConstant(), forX, false)) != this) { |
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119 return result; |
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120 } |
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121 } else if (forX instanceof ConvertNode && forY instanceof ConvertNode) { |
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122 ConvertNode convertX = (ConvertNode) forX; |
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123 ConvertNode convertY = (ConvertNode) forY; |
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124 if (convertX.preservesOrder(condition()) && convertY.preservesOrder(condition()) && convertX.getValue().stamp().isCompatible(convertY.getValue().stamp())) { |
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125 return duplicateModified(convertX.getValue(), convertY.getValue()); |
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126 } |
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127 } |
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128 if (condition.isCommutative()) { |
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129 return this.maybeCommuteInputs(); |
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130 } |
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131 return this; |
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132 } |
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133 |
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134 public static LogicNode tryConstantFold(Condition condition, ValueNode forX, ValueNode forY, ConstantReflectionProvider constantReflection, boolean unorderedIsTrue) { |
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135 if (forX.isConstant() && forY.isConstant() && constantReflection != null) { |
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136 return LogicConstantNode.forBoolean(condition.foldCondition(forX.asConstant(), forY.asConstant(), constantReflection, unorderedIsTrue)); |
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137 } |
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138 return null; |
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139 } |
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140 |
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141 protected abstract LogicNode duplicateModified(ValueNode newX, ValueNode newY); |
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142 |
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143 protected ValueNode canonicalizeSymmetricConstant(CanonicalizerTool tool, Constant constant, ValueNode nonConstant, boolean mirrored) { |
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144 if (nonConstant instanceof ConditionalNode) { |
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145 return optimizeConditional(constant, (ConditionalNode) nonConstant, tool.getConstantReflection(), mirrored ? condition().mirror() : condition()); |
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146 } else if (nonConstant instanceof NormalizeCompareNode) { |
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147 return optimizeNormalizeCmp(constant, (NormalizeCompareNode) nonConstant, mirrored); |
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148 } else if (nonConstant instanceof ConvertNode) { |
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149 ConvertNode convert = (ConvertNode) nonConstant; |
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150 ConstantNode newConstant = canonicalConvertConstant(tool, convert, constant); |
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151 if (newConstant != null) { |
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152 if (mirrored) { |
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153 return duplicateModified(newConstant, convert.getValue()); |
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154 } else { |
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155 return duplicateModified(convert.getValue(), newConstant); |
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156 } |
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157 } |
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158 } |
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159 return this; |
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160 } |
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161 |
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162 private ConstantNode canonicalConvertConstant(CanonicalizerTool tool, ConvertNode convert, Constant constant) { |
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163 ConstantReflectionProvider constantReflection = tool.getConstantReflection(); |
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164 if (convert.preservesOrder(condition(), constant, constantReflection)) { |
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165 Constant reverseConverted = convert.reverse(constant, constantReflection); |
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166 if (convert.convert(reverseConverted, constantReflection).equals(constant)) { |
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167 return ConstantNode.forConstant(convert.getValue().stamp(), reverseConverted, tool.getMetaAccess()); |
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168 } |
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169 } |
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170 return null; |
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171 } |
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172 |
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173 public static LogicNode createCompareNode(StructuredGraph graph, Condition condition, ValueNode x, ValueNode y, ConstantReflectionProvider constantReflection) { |
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174 LogicNode result = createCompareNode(condition, x, y, constantReflection); |
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175 return (result.graph() == null ? graph.unique(result) : result); |
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176 } |
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177 |
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178 public static LogicNode createCompareNode(Condition condition, ValueNode x, ValueNode y, ConstantReflectionProvider constantReflection) { |
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179 assert x.getKind() == y.getKind(); |
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180 assert condition.isCanonical() : "condition is not canonical: " + condition; |
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181 assert !x.getKind().isNumericFloat(); |
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182 |
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183 LogicNode comparison; |
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184 if (condition == Condition.EQ) { |
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185 if (x.stamp() instanceof AbstractObjectStamp) { |
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186 comparison = ObjectEqualsNode.create(x, y, constantReflection); |
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187 } else if (x.stamp() instanceof AbstractPointerStamp) { |
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188 comparison = new PointerEqualsNode(x, y); |
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189 } else { |
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190 assert x.getKind().isNumericInteger(); |
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191 comparison = IntegerEqualsNode.create(x, y, constantReflection); |
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192 } |
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193 } else if (condition == Condition.LT) { |
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194 assert x.getKind().isNumericInteger(); |
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195 comparison = IntegerLessThanNode.create(x, y, constantReflection); |
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196 } else { |
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197 assert condition == Condition.BT; |
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198 assert x.getKind().isNumericInteger(); |
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199 comparison = IntegerBelowNode.create(x, y, constantReflection); |
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200 } |
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201 |
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202 return comparison; |
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203 } |
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204 } |