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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/IntegerBelowThanNode.java @ 15975:0ad889977080

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CompareNode.canonicalizeSymmetricConstant can lead to float<->int changes so the right type of node needs to be created depending on the inputs
author Gilles Duboscq <duboscq@ssw.jku.at>
date Thu, 29 May 2014 14:44:43 +0200
parents d5b824a41530
children df6f2365b153
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1 /*
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2 * Copyright (c) 2011, 2011, 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.api.meta.ProfilingInfo.*;
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27 import com.oracle.graal.compiler.common.calc.*;
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28 import com.oracle.graal.compiler.common.type.*;
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29 import com.oracle.graal.graph.*;
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30 import com.oracle.graal.graph.spi.*;
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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 IntegerBelowThanNode extends CompareNode {
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36
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37 /**
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38 * Constructs a new unsigned integer comparison node.
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39 *
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40 * @param x the instruction producing the first input to the instruction
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41 * @param y the instruction that produces the second input to this instruction
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42 */
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43 public IntegerBelowThanNode(ValueNode x, ValueNode y) {
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44 super(x, y);
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45 assert x.stamp() instanceof IntegerStamp;
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46 assert y.stamp() instanceof IntegerStamp;
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47 }
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48
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49 @Override
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50 public Condition condition() {
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51 return Condition.BT;
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52 }
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53
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54 @Override
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55 public boolean unorderedIsTrue() {
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56 return false;
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57 }
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58
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59 @Override
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60 public TriState evaluate(ConstantReflectionProvider constantReflection, ValueNode forX, ValueNode forY) {
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61 if (GraphUtil.unproxify(forX) == GraphUtil.unproxify(forY)) {
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62 return TriState.FALSE;
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63 } else if (forX.stamp() instanceof IntegerStamp && forY.stamp() instanceof IntegerStamp) {
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64 IntegerStamp xStamp = (IntegerStamp) forX.stamp();
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65 IntegerStamp yStamp = (IntegerStamp) forY.stamp();
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66 if (yStamp.isPositive()) {
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67 if (xStamp.isPositive() && xStamp.upperBound() < yStamp.lowerBound()) {
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68 return TriState.TRUE;
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69 } else if (xStamp.isStrictlyNegative() || xStamp.lowerBound() >= yStamp.upperBound()) {
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70 return TriState.FALSE;
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71 }
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72 }
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73 }
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74 return super.evaluate(constantReflection, forX, forY);
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75 }
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76
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77 @Override
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78 public Node canonical(CanonicalizerTool tool) {
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79 Node result = super.canonical(tool);
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80 if (result != this) {
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81 return result;
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82 }
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83 if (x().isConstant() && x().asConstant().asLong() == 0) {
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84 // 0 |<| y is the same as 0 != y
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85 return graph().unique(new LogicNegationNode(CompareNode.createCompareNode(graph(), Condition.EQ, x(), y())));
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86 }
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87 return this;
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88 }
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89
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90 @Override
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91 protected CompareNode duplicateModified(ValueNode newX, ValueNode newY) {
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92 return new IntegerBelowThanNode(newX, newY);
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93 }
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94 }