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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/IntegerBelowNode.java @ 19403:61d3cb8e1280

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Add generic parameter to NodeClass. Change Graph#getNodes(Class) to Graph#getNodes(NodeClass).
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Mon, 16 Feb 2015 17:47:43 +0100
parents 7e2c87dae93e
children 8fc336a04d77
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1 /*
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2 * Copyright (c) 2011, 2015, 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.*;
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29 import com.oracle.graal.graph.spi.*;
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30 import com.oracle.graal.nodeinfo.*;
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31 import com.oracle.graal.nodes.*;
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32 import com.oracle.graal.nodes.util.*;
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33
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34 @NodeInfo(shortName = "|<|")
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35 public final class IntegerBelowNode extends CompareNode {
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36 public static final NodeClass<IntegerBelowNode> TYPE = NodeClass.get(IntegerBelowNode.class);
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37
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38 public IntegerBelowNode(ValueNode x, ValueNode y) {
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39 super(TYPE, Condition.BT, false, x, y);
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40 assert x.stamp() instanceof IntegerStamp;
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41 assert y.stamp() instanceof IntegerStamp;
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42 }
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43
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44 public static LogicNode create(ValueNode x, ValueNode y, ConstantReflectionProvider constantReflection) {
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45 LogicNode result = CompareNode.tryConstantFold(Condition.BT, x, y, constantReflection, false);
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46 if (result != null) {
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47 return result;
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48 } else {
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49 result = findSynonym(x, y);
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50 if (result != null) {
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51 return result;
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52 }
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53 return new IntegerBelowNode(x, y);
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54 }
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55 }
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56
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57 @Override
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58 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
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59 ValueNode result = super.canonical(tool, forX, forY);
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60 if (result != this) {
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61 return result;
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62 }
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63 LogicNode synonym = findSynonym(forX, forY);
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64 if (synonym != null) {
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65 return synonym;
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66 }
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67 if (forX.isConstant() && forX.asJavaConstant().asLong() == 0) {
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68 // 0 |<| y is the same as 0 != y
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69 return LogicNegationNode.create(CompareNode.createCompareNode(Condition.EQ, forX, forY, tool.getConstantReflection()));
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70 }
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71 return this;
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72 }
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73
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74 private static LogicNode findSynonym(ValueNode forX, ValueNode forY) {
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75 if (GraphUtil.unproxify(forX) == GraphUtil.unproxify(forY)) {
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76 return LogicConstantNode.contradiction();
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77 } else if (forX.stamp() instanceof IntegerStamp && forY.stamp() instanceof IntegerStamp) {
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78 IntegerStamp xStamp = (IntegerStamp) forX.stamp();
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79 IntegerStamp yStamp = (IntegerStamp) forY.stamp();
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80 if (yStamp.isPositive()) {
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81 if (xStamp.isPositive() && xStamp.upperBound() < yStamp.lowerBound()) {
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82 return LogicConstantNode.tautology();
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83 } else if (xStamp.isStrictlyNegative() || xStamp.lowerBound() >= yStamp.upperBound()) {
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84 return LogicConstantNode.contradiction();
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85 }
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86 }
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87 }
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88 return null;
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89 }
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90
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91 @Override
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92 protected CompareNode duplicateModified(ValueNode newX, ValueNode newY) {
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93 return new IntegerBelowNode(newX, newY);
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94 }
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95 }