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annotate graal/com.oracle.max.graal.nodes/src/com/oracle/max/graal/nodes/calc/ConditionalNode.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
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children aaac4894175c
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3733
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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.max.graal.nodes.calc;
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24
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25 import com.oracle.max.graal.graph.*;
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26 import com.oracle.max.graal.nodes.*;
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27 import com.oracle.max.graal.nodes.PhiNode.PhiType;
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28 import com.oracle.max.graal.nodes.spi.*;
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29 import com.sun.cri.ci.*;
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30
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31 /**
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32 * The {@code ConditionalNode} class represents a comparison that yields one of two values. Note that these nodes are not
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33 * built directly from the bytecode but are introduced by canonicalization.
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34 */
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35 public class ConditionalNode extends BinaryNode implements Canonicalizable, LIRLowerable {
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36
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37 @Input private BooleanNode condition;
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38
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39 public BooleanNode condition() {
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40 return condition;
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41 }
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42
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43 public ConditionalNode(BooleanNode condition, ValueNode trueValue, ValueNode falseValue) {
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44 super(trueValue.kind(), trueValue, falseValue);
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45 assert trueValue.kind() == falseValue.kind();
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46 this.condition = condition;
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47 }
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48
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49 public ValueNode trueValue() {
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50 return x();
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51 }
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52
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53 public ValueNode falseValue() {
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54 return y();
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55 }
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56
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57 public static class ConditionalStructure {
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58
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59 public final IfNode ifNode;
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60 public final PhiNode phi;
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61 public final MergeNode merge;
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62
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63 public ConditionalStructure(IfNode ifNode, PhiNode phi, MergeNode merge) {
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64 this.ifNode = ifNode;
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65 this.phi = phi;
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66 this.merge = merge;
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67 }
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68 }
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69
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70 public static ConditionalStructure createConditionalStructure(BooleanNode condition, ValueNode trueValue, ValueNode falseValue) {
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71 return createConditionalStructure(condition, trueValue, falseValue, 0.5);
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72 }
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73
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74 public static ConditionalStructure createConditionalStructure(BooleanNode condition, ValueNode trueValue, ValueNode falseValue, double trueProbability) {
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75 Graph graph = condition.graph();
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76 assert trueValue.kind() == falseValue.kind();
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77 CiKind kind = trueValue.kind();
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78 IfNode ifNode = graph.add(new IfNode(condition, trueProbability));
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79 EndNode trueEnd = graph.add(new EndNode());
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80 EndNode falseEnd = graph.add(new EndNode());
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81 ifNode.setTrueSuccessor(BeginNode.begin(trueEnd));
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82 ifNode.setFalseSuccessor(BeginNode.begin(falseEnd));
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83 MergeNode merge = graph.add(new MergeNode());
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84 merge.addEnd(trueEnd);
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85 merge.addEnd(falseEnd);
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86 PhiNode phi = graph.unique(new PhiNode(kind, merge, PhiType.Value));
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87 phi.addInput(trueValue);
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88 phi.addInput(falseValue);
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89 return new ConditionalStructure(ifNode, phi, merge);
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90 }
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91
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92 @Override
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93 public Node canonical(CanonicalizerTool tool) {
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94 if (condition instanceof ConstantNode) {
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95 ConstantNode c = (ConstantNode) condition;
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96 if (c.asConstant().asBoolean()) {
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97 return trueValue();
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98 } else {
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99 return falseValue();
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100 }
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101 }
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102 if (trueValue() == falseValue()) {
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103 return trueValue();
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104 }
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105
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106 return this;
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107 }
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108
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109 @Override
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110 public void generate(LIRGeneratorTool generator) {
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111 generator.emitConditional(this);
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112 }
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113 }