Mercurial > hg > truffle

annotate graal/com.oracle.max.graal.nodes/src/com/oracle/max/graal/nodes/calc/CompareNode.java @ 5056:2f2c6347fce4

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comments cleanup/retagging
author Gilles Duboscq <duboscq@ssw.jku.at>
date Thu, 08 Mar 2012 15:01:19 +0100
parents e065aa86d077
children
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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.max.graal.nodes.calc;
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24
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25 import com.oracle.max.cri.ci.*;
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26 import com.oracle.max.cri.ri.*;
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27 import com.oracle.max.graal.nodes.*;
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28 import com.oracle.max.graal.nodes.spi.*;
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29 import com.oracle.max.graal.nodes.type.*;
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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 final 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 @Data private final Condition condition;
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43 @Data private final boolean unorderedIsTrue;
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44
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45 public ValueNode x() {
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46 return x;
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47 }
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48
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49 public ValueNode y() {
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50 return y;
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51 }
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52
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53 /**
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54 * Constructs a new Compare instruction.
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55 *
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56 * @param x the instruction producing the first input to the instruction
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57 * @param condition the condition (comparison operation)
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58 * @param y the instruction that produces the second input to this instruction
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59 * @param graph
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60 */
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61 public CompareNode(ValueNode x, Condition condition, ValueNode y) {
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62 this(x, condition, false, y);
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63 }
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64
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65 /**
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66 * Constructs a new Compare instruction.
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67 *
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68 * @param x the instruction producing the first input to the instruction
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69 * @param condition the condition (comparison operation)
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70 * @param y the instruction that produces the second input to this instruction
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71 * @param graph
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72 */
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73 public CompareNode(ValueNode x, Condition condition, boolean unorderedIsTrue, ValueNode y) {
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74 super(StampFactory.illegal());
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75 assert (x == null && y == null) || x.kind() == y.kind();
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76 this.condition = condition;
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77 this.unorderedIsTrue = unorderedIsTrue;
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78 this.x = x;
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79 this.y = y;
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80 }
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81
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82 /**
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83 * Gets the condition (comparison operation) for this instruction.
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84 *
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85 * @return the condition
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86 */
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87 public Condition condition() {
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88 return condition;
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89 }
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90
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91 /**
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92 * Checks whether unordered inputs mean true or false.
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93 *
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94 * @return {@code true} if unordered inputs produce true
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95 */
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96 public boolean unorderedIsTrue() {
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97 return unorderedIsTrue;
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98 }
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99
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100 @Override
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101 public BooleanNode negate() {
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102 return graph().unique(new CompareNode(x(), condition.negate(), !unorderedIsTrue, y()));
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103 }
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104
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105 @Override
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106 public void generate(LIRGeneratorTool gen) {
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107 }
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108
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109 @Override
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110 public String toString(Verbosity verbosity) {
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111 if (verbosity == Verbosity.Name) {
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112 return super.toString(Verbosity.Name) + " " + condition.operator;
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113 } else {
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114 return super.toString(verbosity);
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115 }
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116 }
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117
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118 private ValueNode optimizeMaterialize(CiConstant constant, MaterializeNode materializeNode, RiRuntime runtime) {
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119 CiConstant trueConstant = materializeNode.trueValue().asConstant();
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120 CiConstant falseConstant = materializeNode.falseValue().asConstant();
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121
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122 if (falseConstant != null && trueConstant != null) {
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123 Boolean trueResult = condition().foldCondition(trueConstant, constant, runtime, unorderedIsTrue());
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124 Boolean falseResult = condition().foldCondition(falseConstant, constant, runtime, unorderedIsTrue());
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125
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126 if (trueResult != null && falseResult != null) {
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127 boolean trueUnboxedResult = trueResult;
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128 boolean falseUnboxedResult = falseResult;
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129 if (trueUnboxedResult == falseUnboxedResult) {
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130 return ConstantNode.forBoolean(trueUnboxedResult, graph());
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131 } else {
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132 if (trueUnboxedResult) {
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133 assert falseUnboxedResult == false;
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134 return materializeNode.condition();
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135 } else {
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136 assert falseUnboxedResult == true;
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137 return materializeNode.condition().negate();
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138
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139 }
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140 }
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141 }
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142 }
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143 return this;
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144 }
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145
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146 private ValueNode optimizeNormalizeCmp(CiConstant constant, NormalizeCompareNode normalizeNode) {
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147 if (constant.kind == CiKind.Int && constant.asInt() == 0) {
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148 Condition cond = condition();
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149 boolean isLess = cond == Condition.LE || cond == Condition.LT || cond == Condition.BE || cond == Condition.BT;
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150 boolean canonUnorderedIsTrue = cond != Condition.EQ && (cond == Condition.NE || !(isLess ^ normalizeNode.isUnorderedLess));
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151 CompareNode result = graph().unique(new CompareNode(normalizeNode.x(), cond, canonUnorderedIsTrue, normalizeNode.y()));
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152 return result;
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153 }
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154 return this;
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155 }
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156
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157 @Override
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158 public ValueNode canonical(CanonicalizerTool tool) {
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159 if (x().isConstant() && !y().isConstant()) { // move constants to the left (y)
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160 return graph().unique(new CompareNode(y(), condition.mirror(), unorderedIsTrue(), x()));
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161 } else if (x().isConstant() && y().isConstant()) {
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162 CiConstant constX = x().asConstant();
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163 CiConstant constY = y().asConstant();
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164 Boolean result = condition().foldCondition(constX, constY, tool.runtime(), unorderedIsTrue());
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165 if (result != null) {
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166 return ConstantNode.forBoolean(result, graph());
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167 }
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168 }
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169
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170 if (y().isConstant()) {
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171 if (x() instanceof MaterializeNode) {
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172 return optimizeMaterialize(y().asConstant(), (MaterializeNode) x(), tool.runtime());
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173 } else if (x() instanceof NormalizeCompareNode) {
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174 return optimizeNormalizeCmp(y().asConstant(), (NormalizeCompareNode) x());
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175 }
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176 }
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177
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178 if (x() == y() && x().kind() != CiKind.Float && x().kind() != CiKind.Double) {
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179 return ConstantNode.forBoolean(condition().check(1, 1), graph());
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180 }
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181 if ((condition == Condition.NE || condition == Condition.EQ) && x().kind() == CiKind.Object) {
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182 ValueNode object = null;
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183 if (x().isNullConstant()) {
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184 object = y();
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185 } else if (y().isNullConstant()) {
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186 object = x();
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187 }
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188 if (object != null) {
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189 return graph().unique(new NullCheckNode(object, condition == Condition.EQ));
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190 } else {
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191 Stamp xStamp = x.stamp();
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192 Stamp yStamp = y.stamp();
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193 if (xStamp.alwaysDistinct(yStamp)) {
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194 return ConstantNode.forBoolean(condition == Condition.NE, graph());
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195 }
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196 }
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197 }
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198 return this;
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199 }
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200 }