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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/CompareNode.java @ 5502:13aee5aba8cc

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Moved RiConstant to cri.ri package.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Thu, 07 Jun 2012 17:07:42 +0200
parents d89b20486d87
children dc71b06d09f8
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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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24
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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.ri.*;
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30
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31 /* 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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32 * 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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33 *
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34 * 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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35 * into variants that do not materialize the value (CompareIf, CompareGuard...)
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36 */
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37 public abstract class CompareNode extends BooleanNode implements Canonicalizable, LIRLowerable {
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38
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39 @Input private ValueNode x;
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40 @Input private ValueNode y;
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41
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42 public ValueNode x() {
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43 return x;
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44 }
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45
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46 public ValueNode y() {
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47 return y;
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48 }
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49
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50 /**
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51 * Constructs a new Compare instruction.
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52 *
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53 * @param x the instruction producing the first input to the instruction
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54 * @param y the instruction that produces the second input to this instruction
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55 */
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56 public CompareNode(ValueNode x, ValueNode y) {
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57 super(StampFactory.condition());
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58 assert (x == null && y == null) || x.kind() == y.kind();
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59 this.x = x;
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60 this.y = y;
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61 }
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62
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63 /**
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64 * Gets the condition (comparison operation) for this instruction.
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65 *
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66 * @return the condition
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67 */
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68 public abstract Condition condition();
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69
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70 /**
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71 * Checks whether unordered inputs mean true or false (only applies to float operations).
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72 *
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73 * @return {@code true} if unordered inputs produce true
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74 */
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75 public abstract boolean unorderedIsTrue();
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76
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77 @Override
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78 public void generate(LIRGeneratorTool gen) {
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79 }
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80
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81
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82 private ValueNode optimizeMaterialize(RiConstant constant, MaterializeNode materializeNode, RiRuntime runtime, Condition cond) {
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83 RiConstant trueConstant = materializeNode.trueValue().asConstant();
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84 RiConstant falseConstant = materializeNode.falseValue().asConstant();
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85
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86 if (falseConstant != null && trueConstant != null) {
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87 Boolean trueResult = cond.foldCondition(trueConstant, constant, runtime, unorderedIsTrue());
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88 Boolean falseResult = cond.foldCondition(falseConstant, constant, runtime, unorderedIsTrue());
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89
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90 if (trueResult != null && falseResult != null) {
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91 boolean trueUnboxedResult = trueResult;
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92 boolean falseUnboxedResult = falseResult;
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93 if (trueUnboxedResult == falseUnboxedResult) {
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94 return ConstantNode.forBoolean(trueUnboxedResult, graph());
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95 } else {
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96 if (trueUnboxedResult) {
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97 assert falseUnboxedResult == false;
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98 return materializeNode.condition();
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99 } else {
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100 assert falseUnboxedResult == true;
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101 negateUsages();
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102 return materializeNode.condition();
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103
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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 return this;
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109 }
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110
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111 protected ValueNode optimizeNormalizeCmp(RiConstant constant, NormalizeCompareNode normalizeNode, boolean mirrored) {
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112 throw new GraalInternalError("NormalizeCompareNode connected to %s (%s %s %s)", this, constant, normalizeNode, mirrored);
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113 }
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114
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115 public ValueNode canonical(CanonicalizerTool tool) {
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116 if (x().isConstant() && y().isConstant()) {
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117 return ConstantNode.forBoolean(condition().foldCondition(x().asConstant(), y().asConstant(), tool.runtime(), unorderedIsTrue()), graph());
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118 }
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119 if (x().isConstant()) {
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120 if (y() instanceof MaterializeNode) {
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121 return optimizeMaterialize(x().asConstant(), (MaterializeNode) y(), tool.runtime(), condition().mirror());
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122 } else if (y() instanceof NormalizeCompareNode) {
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123 return optimizeNormalizeCmp(x().asConstant(), (NormalizeCompareNode) y(), true);
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124 }
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125 } else if (y().isConstant()) {
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126 if (x() instanceof MaterializeNode) {
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127 return optimizeMaterialize(y().asConstant(), (MaterializeNode) x(), tool.runtime(), condition());
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128 } else if (x() instanceof NormalizeCompareNode) {
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129 return optimizeNormalizeCmp(y().asConstant(), (NormalizeCompareNode) x(), false);
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130 }
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131 }
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132 return this;
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133 }
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134 }