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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/NormalizeCompareNode.java @ 14906:f3a5036cc13c

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javadoc fixes javadoc has become stricter in jdk8
author Bernhard Urban <bernhard.urban@jku.at>
date Mon, 31 Mar 2014 20:51:09 +0200
parents 34c07ef28bc9
children 882f4cb7cfcf
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1 /*
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2 * Copyright (c) 2009, 2012, 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.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
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30 /**
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31 * 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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32 * of the inputs is NaN), the result is 1 if isUnorderedLess is false and -1 if isUnorderedLess is
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33 * true.
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34 */
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35 public final class NormalizeCompareNode extends BinaryNode implements Lowerable {
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36
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37 public final boolean isUnorderedLess;
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38
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39 /**
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40 * Creates a new compare operation.
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41 *
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42 * @param x the first input
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43 * @param y the second input
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44 * @param isUnorderedLess true when an unordered floating point comparison is interpreted as
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45 * less, false when greater.
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46 */
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47 public NormalizeCompareNode(ValueNode x, ValueNode y, boolean isUnorderedLess) {
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48 super(StampFactory.forKind(Kind.Int), x, y);
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49 this.isUnorderedLess = isUnorderedLess;
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50 }
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51
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52 @Override
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53 public void lower(LoweringTool tool) {
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54 LogicNode equalComp;
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55 LogicNode lessComp;
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56 if (x().stamp() instanceof FloatStamp) {
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57 equalComp = graph().unique(new FloatEqualsNode(x(), y()));
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58 lessComp = graph().unique(new FloatLessThanNode(x(), y(), isUnorderedLess));
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59 } else {
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60 equalComp = graph().unique(new IntegerEqualsNode(x(), y()));
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61 lessComp = graph().unique(new IntegerLessThanNode(x(), y()));
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62 }
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63
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64 ConditionalNode equalValue = graph().unique(new ConditionalNode(equalComp, ConstantNode.forInt(0, graph()), ConstantNode.forInt(1, graph())));
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65 ConditionalNode value = graph().unique(new ConditionalNode(lessComp, ConstantNode.forInt(-1, graph()), equalValue));
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66
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67 graph().replaceFloating(this, value);
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68 }
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69 }