Mercurial > hg > truffle
annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/CompareNode.java @ 18713:cbb097347545
Convert compare against Class to compare against Klass
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Wed, 17 Dec 2014 19:57:58 -0800 |
parents | 0f4813e0b4a9 |
children | ab9d3ff6829b |
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.spi.*; |
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30 import com.oracle.graal.nodeinfo.*; |
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31 import com.oracle.graal.nodes.*; |
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32 |
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33 /* 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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34 * 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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35 * |
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36 * 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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37 * into variants that do not materialize the value (CompareIf, CompareGuard...) |
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38 */ |
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39 @NodeInfo |
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40 public abstract class CompareNode extends BinaryOpLogicNode { |
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41 |
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42 /** |
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43 * Constructs a new Compare instruction. |
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44 * |
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45 * @param x the instruction producing the first input to the instruction |
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46 * @param y the instruction that produces the second input to this instruction |
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47 */ |
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48 public CompareNode(ValueNode x, ValueNode y) { |
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49 super(x, y); |
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50 } |
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51 |
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52 /** |
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53 * Gets the condition (comparison operation) for this instruction. |
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54 * |
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55 * @return the condition |
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56 */ |
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57 public abstract Condition condition(); |
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58 |
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59 /** |
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60 * Checks whether unordered inputs mean true or false (only applies to float operations). |
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61 * |
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62 * @return {@code true} if unordered inputs produce true |
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63 */ |
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64 public abstract boolean unorderedIsTrue(); |
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65 |
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66 private ValueNode optimizeConditional(Constant constant, ConditionalNode conditionalNode, ConstantReflectionProvider constantReflection, Condition cond) { |
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67 Constant trueConstant = conditionalNode.trueValue().asConstant(); |
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68 Constant falseConstant = conditionalNode.falseValue().asConstant(); |
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69 |
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70 if (falseConstant != null && trueConstant != null && constantReflection != null) { |
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71 boolean trueResult = cond.foldCondition(trueConstant, constant, constantReflection, unorderedIsTrue()); |
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72 boolean falseResult = cond.foldCondition(falseConstant, constant, constantReflection, unorderedIsTrue()); |
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73 |
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74 if (trueResult == falseResult) { |
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75 return LogicConstantNode.forBoolean(trueResult); |
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76 } else { |
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77 if (trueResult) { |
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78 assert falseResult == false; |
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79 return conditionalNode.condition(); |
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80 } else { |
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81 assert falseResult == true; |
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82 return LogicNegationNode.create(conditionalNode.condition()); |
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83 |
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84 } |
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85 } |
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86 } |
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87 return this; |
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88 } |
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89 |
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90 protected ValueNode optimizeNormalizeCmp(Constant constant, NormalizeCompareNode normalizeNode, boolean mirrored) { |
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91 throw new GraalInternalError("NormalizeCompareNode connected to %s (%s %s %s)", this, constant, normalizeNode, mirrored); |
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92 } |
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93 |
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94 @Override |
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95 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) { |
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96 if (forX.isConstant() && forY.isConstant()) { |
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97 return LogicConstantNode.forBoolean(condition().foldCondition(forX.asConstant(), forY.asConstant(), tool.getConstantReflection(), unorderedIsTrue())); |
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98 } |
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99 ValueNode result; |
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100 if (forX.isConstant()) { |
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101 if ((result = canonicalizeSymmetricConstant(tool, forX.asConstant(), forY, true)) != this) { |
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102 return result; |
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103 } |
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104 } else if (forY.isConstant()) { |
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105 if ((result = canonicalizeSymmetricConstant(tool, forY.asConstant(), forX, false)) != this) { |
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106 return result; |
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107 } |
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108 } else if (forX instanceof ConvertNode && forY instanceof ConvertNode) { |
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109 ConvertNode convertX = (ConvertNode) forX; |
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110 ConvertNode convertY = (ConvertNode) forY; |
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111 if (convertX.preservesOrder(condition()) && convertY.preservesOrder(condition()) && convertX.getValue().stamp().isCompatible(convertY.getValue().stamp())) { |
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112 return duplicateModified(convertX.getValue(), convertY.getValue()); |
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113 } |
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114 } |
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115 return this; |
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116 } |
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117 |
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118 protected abstract CompareNode duplicateModified(ValueNode newX, ValueNode newY); |
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119 |
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120 protected ValueNode canonicalizeSymmetricConstant(CanonicalizerTool tool, Constant constant, ValueNode nonConstant, boolean mirrored) { |
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121 if (nonConstant instanceof ConditionalNode) { |
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122 return optimizeConditional(constant, (ConditionalNode) nonConstant, tool.getConstantReflection(), mirrored ? condition().mirror() : condition()); |
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123 } else if (nonConstant instanceof NormalizeCompareNode) { |
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124 return optimizeNormalizeCmp(constant, (NormalizeCompareNode) nonConstant, mirrored); |
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125 } else if (nonConstant instanceof ConvertNode) { |
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126 ConvertNode convert = (ConvertNode) nonConstant; |
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127 ConstantNode newConstant = canonicalConvertConstant(tool, convert, constant); |
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128 if (newConstant != null) { |
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129 if (mirrored) { |
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130 return duplicateModified(newConstant, convert.getValue()); |
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131 } else { |
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132 return duplicateModified(convert.getValue(), newConstant); |
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133 } |
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134 } |
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135 } |
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136 return this; |
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137 } |
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138 |
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139 private ConstantNode canonicalConvertConstant(CanonicalizerTool tool, ConvertNode convert, Constant constant) { |
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140 if (convert.preservesOrder(condition(), constant)) { |
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141 Constant reverseConverted = convert.reverse(constant); |
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142 if (convert.convert(reverseConverted).equals(constant)) { |
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143 return ConstantNode.forConstant(convert.getValue().stamp(), reverseConverted, tool.getMetaAccess()); |
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144 } |
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145 } |
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146 return null; |
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147 } |
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148 |
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149 public static CompareNode createCompareNode(StructuredGraph graph, Condition condition, ValueNode x, ValueNode y) { |
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150 return graph.unique(createCompareNode(condition, x, y)); |
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151 } |
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152 |
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153 public static CompareNode createCompareNode(Condition condition, ValueNode x, ValueNode y) { |
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154 assert x.getKind() == y.getKind(); |
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155 assert condition.isCanonical() : "condition is not canonical: " + condition; |
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156 assert !x.getKind().isNumericFloat(); |
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157 |
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158 CompareNode comparison; |
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159 if (condition == Condition.EQ) { |
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160 if (x.stamp() instanceof AbstractObjectStamp) { |
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161 comparison = ObjectEqualsNode.create(x, y); |
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162 } else if (x.stamp() instanceof AbstractPointerStamp) { |
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163 comparison = PointerEqualsNode.create(x, y); |
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164 } else { |
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165 assert x.getKind().isNumericInteger(); |
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166 comparison = IntegerEqualsNode.create(x, y); |
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167 } |
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168 } else if (condition == Condition.LT) { |
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169 assert x.getKind().isNumericInteger(); |
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170 comparison = IntegerLessThanNode.create(x, y); |
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171 } else { |
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172 assert condition == Condition.BT; |
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173 assert x.getKind().isNumericInteger(); |
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174 comparison = IntegerBelowNode.create(x, y); |
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175 } |
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176 |
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177 return comparison; |
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178 } |
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179 } |