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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/NormalizeCompareNode.java @ 17450:45b45f902bed

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removed Node generation (GRAAL-857)
author Doug Simon <doug.simon@oracle.com>
date Wed, 15 Oct 2014 15:35:33 +0200
parents c9bb0da795d4
children f57d86eb036f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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.type.*;
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27 import com.oracle.graal.graph.spi.*;
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28 import com.oracle.graal.nodeinfo.*;
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29 import com.oracle.graal.nodes.*;
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30 import com.oracle.graal.nodes.spi.*;
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32 /**
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33 * 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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34 * of the inputs is NaN), the result is 1 if isUnorderedLess is false and -1 if isUnorderedLess is
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35 * true.
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36 */
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37 @NodeInfo
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38 public class NormalizeCompareNode extends BinaryNode implements Lowerable {
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39
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40 protected final boolean isUnorderedLess;
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41
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42 /**
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43 * Creates a new compare operation.
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44 *
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45 * @param x the first input
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46 * @param y the second input
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47 * @param isUnorderedLess true when an unordered floating point comparison is interpreted as
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48 * less, false when greater.
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49 */
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50 public static NormalizeCompareNode create(ValueNode x, ValueNode y, boolean isUnorderedLess) {
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51 return new NormalizeCompareNode(x, y, isUnorderedLess);
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52 }
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53
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54 protected NormalizeCompareNode(ValueNode x, ValueNode y, boolean isUnorderedLess) {
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55 super(StampFactory.forKind(Kind.Int), x, y);
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56 this.isUnorderedLess = isUnorderedLess;
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57 }
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58
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59 @Override
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60 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
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61 // nothing to do
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62 return this;
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63 }
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64
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65 @Override
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66 public void lower(LoweringTool tool) {
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67 LogicNode equalComp;
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68 LogicNode lessComp;
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69 if (getX().stamp() instanceof FloatStamp) {
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70 equalComp = graph().unique(FloatEqualsNode.create(getX(), getY()));
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71 lessComp = graph().unique(FloatLessThanNode.create(getX(), getY(), isUnorderedLess));
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72 } else {
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73 equalComp = graph().unique(IntegerEqualsNode.create(getX(), getY()));
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74 lessComp = graph().unique(IntegerLessThanNode.create(getX(), getY()));
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75 }
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76
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77 ConditionalNode equalValue = graph().unique(ConditionalNode.create(equalComp, ConstantNode.forInt(0, graph()), ConstantNode.forInt(1, graph())));
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78 ConditionalNode value = graph().unique(ConditionalNode.create(lessComp, ConstantNode.forInt(-1, graph()), equalValue));
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79
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80 graph().replaceFloating(this, value);
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81 }
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82 }