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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/FloatEqualsNode.java @ 16212:51c7c676d41a

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implement Canonicalizable.Binary in the BinaryOpLogicNode hierarchy
author Lukas Stadler <lukas.stadler@oracle.com>
date Wed, 25 Jun 2014 11:21:44 +0200
parents 66a9286203a2
children 5d468add216f
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1 /*
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2 * Copyright (c) 2011, 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.compiler.common.*;
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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.*;
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29 import com.oracle.graal.graph.spi.*;
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30 import com.oracle.graal.nodes.*;
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31 import com.oracle.graal.nodes.util.*;
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32
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33 @NodeInfo(shortName = "==")
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34 public final class FloatEqualsNode extends CompareNode {
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35
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36 /**
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37 * Constructs a new floating point equality comparison node.
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38 *
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39 * @param x the instruction producing the first input to the instruction
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40 * @param y the instruction that produces the second input to this instruction
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41 */
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42 public FloatEqualsNode(ValueNode x, ValueNode y) {
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43 super(x, y);
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44 assert x.stamp() instanceof FloatStamp && y.stamp() instanceof FloatStamp : x.stamp() + " " + y.stamp();
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45 assert x.stamp().isCompatible(y.stamp());
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46 }
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47
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48 @Override
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49 public Condition condition() {
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50 return Condition.EQ;
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51 }
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52
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53 @Override
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54 public boolean unorderedIsTrue() {
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55 return false;
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56 }
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57
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58 @Override
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59 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
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60 ValueNode result = super.canonical(tool, forX, forY);
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61 if (result != this) {
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62 return result;
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63 }
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64 if (forX.stamp() instanceof FloatStamp && forY.stamp() instanceof FloatStamp) {
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65 FloatStamp xStamp = (FloatStamp) forX.stamp();
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66 FloatStamp yStamp = (FloatStamp) forY.stamp();
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67 if (GraphUtil.unproxify(forX) == GraphUtil.unproxify(forY) && xStamp.isNonNaN() && yStamp.isNonNaN()) {
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68 return LogicConstantNode.tautology();
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69 } else if (xStamp.alwaysDistinct(yStamp)) {
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70 return LogicConstantNode.contradiction();
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71 }
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72 }
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73 return this;
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74 }
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75
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76 @Override
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77 protected CompareNode duplicateModified(ValueNode newX, ValueNode newY) {
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78 if (newX.stamp() instanceof FloatStamp && newY.stamp() instanceof FloatStamp) {
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79 return new FloatEqualsNode(newX, newY);
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80 } else if (newX.stamp() instanceof IntegerStamp && newY.stamp() instanceof IntegerStamp) {
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81 return new IntegerEqualsNode(newX, newY);
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82 }
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83 throw GraalInternalError.shouldNotReachHere();
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84 }
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85 }