Mercurial > hg > truffle
annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ConditionalNode.java @ 14841:47e4d2e01c6e
Split LIRGenerator and fix AMD64 backend.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Wed, 26 Mar 2014 11:49:07 +0100 |
parents | 1cf373d2b415 |
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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.calc; |
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24 |
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25 import static com.oracle.graal.nodes.calc.CompareNode.*; |
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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.*; |
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29 import com.oracle.graal.graph.spi.*; |
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30 import com.oracle.graal.nodes.*; |
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31 import com.oracle.graal.nodes.java.*; |
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32 import com.oracle.graal.nodes.spi.*; |
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33 import com.oracle.graal.nodes.type.*; |
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34 |
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35 /** |
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36 * The {@code ConditionalNode} class represents a comparison that yields one of two values. Note |
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37 * that these nodes are not built directly from the bytecode but are introduced by canonicalization. |
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38 */ |
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39 public final class ConditionalNode extends BinaryNode implements Canonicalizable, LIRLowerable { |
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40 |
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41 @Input private LogicNode condition; |
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42 |
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43 public LogicNode condition() { |
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44 return condition; |
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45 } |
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46 |
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47 public ConditionalNode(LogicNode condition) { |
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48 this(condition, ConstantNode.forInt(1, condition.graph()), ConstantNode.forInt(0, condition.graph())); |
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49 } |
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50 |
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51 public ConditionalNode(LogicNode condition, ValueNode trueValue, ValueNode falseValue) { |
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52 super(trueValue.stamp().meet(falseValue.stamp()), trueValue, falseValue); |
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53 assert trueValue.stamp().isCompatible(falseValue.stamp()); |
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54 this.condition = condition; |
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55 } |
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56 |
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57 @Override |
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58 public boolean inferStamp() { |
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59 return updateStamp(x().stamp().meet(y().stamp())); |
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60 } |
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61 |
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62 public ValueNode trueValue() { |
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63 return x(); |
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64 } |
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65 |
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66 public ValueNode falseValue() { |
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67 return y(); |
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68 } |
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69 |
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70 @Override |
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71 public Node canonical(CanonicalizerTool tool) { |
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72 if (condition instanceof LogicNegationNode) { |
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73 LogicNegationNode negated = (LogicNegationNode) condition; |
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74 return graph().unique(new ConditionalNode(negated.getInput(), falseValue(), trueValue())); |
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75 } |
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76 |
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77 // this optimizes the case where a value that can only be 0 or 1 is materialized to 0 or 1 |
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78 if (x().isConstant() && y().isConstant() && condition instanceof IntegerEqualsNode) { |
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79 IntegerEqualsNode equals = (IntegerEqualsNode) condition; |
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80 if (equals.y().isConstant() && equals.y().asConstant().equals(Constant.INT_0) && equals.x().stamp() instanceof IntegerStamp) { |
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81 IntegerStamp equalsXStamp = (IntegerStamp) equals.x().stamp(); |
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82 if (equalsXStamp.upMask() == 1) { |
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83 if (x().asConstant().equals(Constant.INT_0) && y().asConstant().equals(Constant.INT_1)) { |
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84 return equals.x(); |
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85 } |
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86 } |
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87 } |
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88 } |
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89 if (condition instanceof LogicConstantNode) { |
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90 LogicConstantNode c = (LogicConstantNode) condition; |
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91 if (c.getValue()) { |
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92 return trueValue(); |
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93 } else { |
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94 return falseValue(); |
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95 } |
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96 } |
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97 if (condition instanceof CompareNode && ((CompareNode) condition).condition() == Condition.EQ) { |
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98 // optimize the pattern (x == y) ? x : y |
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99 CompareNode compare = (CompareNode) condition; |
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100 if ((compare.x() == trueValue() && compare.y() == falseValue()) || (compare.x() == falseValue() && compare.y() == trueValue())) { |
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101 return falseValue(); |
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102 } |
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103 } |
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104 if (trueValue() == falseValue()) { |
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105 return trueValue(); |
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106 } |
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107 |
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108 return this; |
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109 } |
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110 |
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111 @Override |
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112 public void generate(NodeLIRGeneratorTool generator) { |
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113 generator.emitConditional(this); |
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114 } |
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115 |
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116 private ConditionalNode(@InjectedNodeParameter StructuredGraph graph, Condition condition, ValueNode x, ValueNode y) { |
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117 this(createCompareNode(graph, condition, x, y)); |
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118 } |
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119 |
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120 private ConditionalNode(ValueNode type, ValueNode object) { |
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121 this(type.graph().unique(new InstanceOfDynamicNode(type, object))); |
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122 } |
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123 |
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124 @NodeIntrinsic |
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125 public static native boolean materializeCondition(@ConstantNodeParameter Condition condition, int x, int y); |
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126 |
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127 @NodeIntrinsic |
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128 public static native boolean materializeCondition(@ConstantNodeParameter Condition condition, long x, long y); |
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129 |
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130 @NodeIntrinsic |
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131 public static boolean materializeIsInstance(Class mirror, Object object) { |
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132 return mirror.isInstance(object); |
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133 } |
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134 } |