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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ConditionalNode.java @ 8451:2ffd472c5d25

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Backed out changeset: 10293cbfc2b6
author Doug Simon <doug.simon@oracle.com>
date Fri, 22 Mar 2013 19:08:07 +0100
parents 10293cbfc2b6
children 7abc6865bdc6
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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.nodes.*;
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29 import com.oracle.graal.nodes.java.*;
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30 import com.oracle.graal.nodes.spi.*;
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31
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32 /**
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33 * The {@code ConditionalNode} class represents a comparison that yields one of two values. Note
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34 * that these nodes are not built directly from the bytecode but are introduced by canonicalization.
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35 */
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36 public final class ConditionalNode extends BinaryNode implements Canonicalizable, LIRLowerable, Negatable {
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37
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38 @Input private LogicNode condition;
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39
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40 public LogicNode condition() {
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41 return condition;
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42 }
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43
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44 public ConditionalNode(LogicNode condition, ValueNode trueValue, ValueNode falseValue) {
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45 super(trueValue.kind(), trueValue, falseValue);
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46 assert trueValue.kind() == falseValue.kind();
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47 this.condition = condition;
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48 }
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49
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50 @Override
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51 public boolean inferStamp() {
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52 return updateStamp(x().stamp().meet(y().stamp()));
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53 }
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54
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55 public ValueNode trueValue() {
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56 return x();
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57 }
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58
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59 public ValueNode falseValue() {
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60 return y();
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61 }
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62
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63 @Override
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64 public ValueNode canonical(CanonicalizerTool tool) {
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65 // this optimizes the case where a value that can only be 0 or 1 is materialized to 0 or 1
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66 if (x().isConstant() && y().isConstant() && condition instanceof IntegerEqualsNode) {
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67 IntegerEqualsNode equals = (IntegerEqualsNode) condition;
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68 if (equals.y().isConstant() && equals.y().asConstant().equals(Constant.INT_0)) {
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69 if (equals.x().integerStamp().mask() == 1) {
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70 if (x().asConstant().equals(Constant.INT_0) && y().asConstant().equals(Constant.INT_1)) {
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71 return equals.x();
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72 }
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73 }
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74 }
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75 }
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76 if (condition instanceof LogicConstantNode) {
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77 LogicConstantNode c = (LogicConstantNode) condition;
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78 if (c.getValue()) {
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79 return trueValue();
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80 } else {
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81 return falseValue();
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82 }
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83 }
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84 if (trueValue() == falseValue()) {
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85 return trueValue();
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86 }
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87
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88 return this;
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89 }
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90
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91 @Override
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92 public void generate(LIRGeneratorTool generator) {
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93 generator.emitConditional(this);
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94 }
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95
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96 @Override
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97 public Negatable negate() {
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98 ConditionalNode replacement = graph().unique(new ConditionalNode(condition, falseValue(), trueValue()));
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99 ((StructuredGraph) graph()).replaceFloating(this, replacement);
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100 return replacement;
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101 }
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102
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103 private ConditionalNode(Condition condition, ValueNode x, ValueNode y) {
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104 this(createCompareNode(condition, x, y), ConstantNode.forInt(1, x.graph()), ConstantNode.forInt(0, x.graph()));
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105 }
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106
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107 private ConditionalNode(ValueNode type, ValueNode object) {
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108 this(type.graph().add(new InstanceOfDynamicNode(type, object)), ConstantNode.forInt(1, type.graph()), ConstantNode.forInt(0, type.graph()));
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109 }
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110
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111 @NodeIntrinsic
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112 public static native boolean materializeCondition(@ConstantNodeParameter Condition condition, int x, int y);
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113
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114 @NodeIntrinsic
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115 public static native boolean materializeCondition(@ConstantNodeParameter Condition condition, long x, long y);
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116
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117 @NodeIntrinsic
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118 public static native boolean materializeIsInstance(Class mirror, Object object);
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119 }