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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ConditionalNode.java @ 12655:2c4aa758ee18

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made ConstantNodes external to a Graph (GRAAL-508)
author Doug Simon <doug.simon@oracle.com>
date Sun, 03 Nov 2013 15:27:52 +0100
parents da9db8331658
children 34c07ef28bc9
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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.kind(), trueValue, falseValue);
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53 assert trueValue.kind() == falseValue.kind();
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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(LIRGeneratorTool 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 }