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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/NormalizeCompareNode.java @ 19379:b720a1e02fa0

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Add graph building time canonicalization for NormalizeCompareNode.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 15 Feb 2015 14:33:16 +0100
parents 7227f5671c87
children 7e2c87dae93e
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1 /*
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2 * Copyright (c) 2009, 2014, 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.api.meta.*;
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26 import com.oracle.graal.compiler.common.calc.*;
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27 import com.oracle.graal.compiler.common.type.*;
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28 import com.oracle.graal.graph.spi.*;
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29 import com.oracle.graal.nodeinfo.*;
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30 import com.oracle.graal.nodes.*;
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31 import com.oracle.graal.nodes.spi.*;
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32
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33 /**
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34 * Returns -1, 0, or 1 if either x &lt; y, x == y, or x &gt; y. If the comparison is undecided (one
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35 * of the inputs is NaN), the result is 1 if isUnorderedLess is false and -1 if isUnorderedLess is
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36 * true.
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37 */
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38 @NodeInfo
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39 public class NormalizeCompareNode extends BinaryNode implements Lowerable {
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40
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41 protected final boolean isUnorderedLess;
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42
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43 public NormalizeCompareNode(ValueNode x, ValueNode y, boolean isUnorderedLess) {
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44 super(StampFactory.forKind(Kind.Int), x, y);
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45 this.isUnorderedLess = isUnorderedLess;
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46 }
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47
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48 public static ValueNode create(ValueNode x, ValueNode y, boolean isUnorderedLess, ConstantReflectionProvider constantReflection) {
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49 LogicNode result = CompareNode.tryConstantFold(Condition.EQ, x, y, constantReflection, false);
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50 if (result instanceof LogicConstantNode) {
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51 LogicConstantNode logicConstantNode = (LogicConstantNode) result;
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52 LogicNode resultLT = CompareNode.tryConstantFold(Condition.LT, x, y, constantReflection, isUnorderedLess);
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53 if (resultLT instanceof LogicConstantNode) {
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54 LogicConstantNode logicConstantNodeLT = (LogicConstantNode) resultLT;
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55 if (logicConstantNodeLT.getValue()) {
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56 return ConstantNode.forInt(-1);
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57 } else if (logicConstantNode.getValue()) {
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58 return ConstantNode.forInt(0);
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59 } else {
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60 return ConstantNode.forInt(1);
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61 }
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62 }
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63 }
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64
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65 return new NormalizeCompareNode(x, y, isUnorderedLess);
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66 }
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67
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68 @Override
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69 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
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70 // nothing to do
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71 return this;
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72 }
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73
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74 @Override
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75 public void lower(LoweringTool tool) {
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76 LogicNode equalComp;
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77 LogicNode lessComp;
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78 if (getX().stamp() instanceof FloatStamp) {
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79 equalComp = graph().unique(FloatEqualsNode.create(getX(), getY(), tool.getConstantReflection()));
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80 lessComp = graph().unique(FloatLessThanNode.create(getX(), getY(), isUnorderedLess, tool.getConstantReflection()));
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81 } else {
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82 equalComp = graph().unique(IntegerEqualsNode.create(getX(), getY(), tool.getConstantReflection()));
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83 lessComp = graph().unique(IntegerLessThanNode.create(getX(), getY(), tool.getConstantReflection()));
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84 }
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85
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86 ConditionalNode equalValue = graph().unique(new ConditionalNode(equalComp, ConstantNode.forInt(0, graph()), ConstantNode.forInt(1, graph())));
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87 ConditionalNode value = graph().unique(new ConditionalNode(lessComp, ConstantNode.forInt(-1, graph()), equalValue));
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88
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89 graph().replaceFloating(this, value);
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90 }
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91 }