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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/CompareNode.java @ 5425:0364a2a874b8

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changes towards a canonical representation of comparisons: * new createNullCheckGuard helper method on CiLoweringTool * replaced NullCheckNode with IsNullNode * GuardNode and FixedGuardNode can be negated * keep a list of conditions that are true/false in CheckCastEliminationPhase * FixedGuardNode has only one condition * GraphBuilderPhase creates canonical CompareNodes * BooleanNodes can negate their usages * added junit test for canonicalized compares * removed junit test for negated instanceof * added more thorough graph comparison for junit tests * CheckCastEliminationPhase keeps track of conditions that are known to be true/false
author Lukas Stadler <lukas.stadler@jku.at>
date Tue, 22 May 2012 16:19:02 +0200
parents 80127e4a1742
children 141817e206d4
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1 /*
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2 * Copyright (c) 2011, 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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25 import com.oracle.graal.graph.*;
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26 import com.oracle.graal.nodes.*;
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27 import com.oracle.graal.nodes.spi.*;
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28 import com.oracle.graal.nodes.type.*;
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29 import com.oracle.max.cri.ci.*;
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30 import com.oracle.max.cri.ri.*;
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31
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32 /* 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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33 * 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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34 *
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35 * 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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36 * into variants that do not materialize the value (CompareIf, CompareGuard...)
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37 */
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38 public abstract class CompareNode extends BooleanNode implements Canonicalizable, LIRLowerable {
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39
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40 @Input private ValueNode x;
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41 @Input private ValueNode y;
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42
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43 public ValueNode x() {
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44 return x;
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45 }
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46
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47 public ValueNode y() {
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48 return y;
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49 }
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50
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51 /**
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52 * Constructs a new Compare instruction.
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53 *
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54 * @param x the instruction producing the first input to the instruction
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55 * @param y the instruction that produces the second input to this instruction
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56 */
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57 public CompareNode(ValueNode x, ValueNode y) {
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58 super(StampFactory.illegal());
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59 assert (x == null && y == null) || x.kind() == y.kind();
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60 this.x = x;
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61 this.y = y;
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62 }
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63
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64 /**
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65 * Gets the condition (comparison operation) for this instruction.
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66 *
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67 * @return the condition
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68 */
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69 public abstract Condition condition();
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70
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71 /**
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72 * Checks whether unordered inputs mean true or false (only applies to float operations).
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73 *
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74 * @return {@code true} if unordered inputs produce true
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75 */
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76 public abstract boolean unorderedIsTrue();
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77
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78 @Override
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79 public void generate(LIRGeneratorTool gen) {
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80 }
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81
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82
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83 private ValueNode optimizeMaterialize(CiConstant constant, MaterializeNode materializeNode, RiRuntime runtime, Condition cond) {
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84 CiConstant trueConstant = materializeNode.trueValue().asConstant();
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85 CiConstant falseConstant = materializeNode.falseValue().asConstant();
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86
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87 if (falseConstant != null && trueConstant != null) {
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88 Boolean trueResult = cond.foldCondition(trueConstant, constant, runtime, unorderedIsTrue());
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89 Boolean falseResult = cond.foldCondition(falseConstant, constant, runtime, unorderedIsTrue());
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90
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91 if (trueResult != null && falseResult != null) {
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92 boolean trueUnboxedResult = trueResult;
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93 boolean falseUnboxedResult = falseResult;
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94 if (trueUnboxedResult == falseUnboxedResult) {
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95 return ConstantNode.forBoolean(trueUnboxedResult, graph());
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96 } else {
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97 if (trueUnboxedResult) {
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98 assert falseUnboxedResult == false;
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99 return materializeNode.condition();
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100 } else {
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101 assert falseUnboxedResult == true;
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102 negateUsages();
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103 return materializeNode.condition();
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104
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105 }
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106 }
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107 }
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108 }
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109 return this;
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110 }
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111
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112 protected ValueNode optimizeNormalizeCmp(CiConstant constant, NormalizeCompareNode normalizeNode, boolean mirrored) {
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113 throw new GraalInternalError("NormalizeCompareNode connected to %s (%s %s %s)", this, constant, normalizeNode, mirrored);
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114 }
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115
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116 public ValueNode canonical(CanonicalizerTool tool) {
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117 if (x().isConstant() && y().isConstant()) {
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118 return ConstantNode.forBoolean(condition().foldCondition(x().asConstant(), y().asConstant(), tool.runtime(), unorderedIsTrue()), graph());
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119 }
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120 if (x().isConstant()) {
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121 if (y() instanceof MaterializeNode) {
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122 return optimizeMaterialize(x().asConstant(), (MaterializeNode) y(), tool.runtime(), condition().mirror());
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123 } else if (y() instanceof NormalizeCompareNode) {
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124 return optimizeNormalizeCmp(x().asConstant(), (NormalizeCompareNode) y(), true);
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125 }
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126 } else if (y().isConstant()) {
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127 if (x() instanceof MaterializeNode) {
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128 return optimizeMaterialize(y().asConstant(), (MaterializeNode) x(), tool.runtime(), condition());
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129 } else if (x() instanceof NormalizeCompareNode) {
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130 return optimizeNormalizeCmp(y().asConstant(), (NormalizeCompareNode) x(), false);
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131 }
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132 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
133 return this;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
134 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
135 }