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annotate graal/com.oracle.max.graal.compiler/src/com/sun/c1x/ir/Xor.java @ 2872:0341b6424579

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Project renaming.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 08 Jun 2011 08:42:25 +0200
parents graal/GraalCompiler/src/com/sun/c1x/ir/Xor.java@fc75fd3fa5e4
children
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1 /*
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2 * Copyright (c) 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.sun.c1x.ir;
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24
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25 import com.oracle.graal.graph.*;
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26 import com.oracle.max.graal.opt.CanonicalizerPhase.*;
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27 import com.sun.cri.bytecode.*;
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28 import com.sun.cri.ci.*;
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29
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30 public final class Xor extends Logic {
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31 private static final XorCanonicalizerOp CANONICALIZER = new XorCanonicalizerOp();
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32
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33 /**
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34 * @param opcode
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35 * @param kind
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36 * @param x
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37 * @param y
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38 * @param graph
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39 */
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40 public Xor(CiKind kind, Value x, Value y, Graph graph) {
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41 super(kind, kind == CiKind.Int ? Bytecodes.IXOR : Bytecodes.LXOR, x, y, graph);
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42 }
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43
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44 @Override
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45 public String shortName() {
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46 return "^";
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47 }
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48
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49 @Override
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50 public Node copy(Graph into) {
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51 Xor x = new Xor(kind, null, null, into);
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52 return x;
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53 }
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54
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55 @SuppressWarnings("unchecked")
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56 @Override
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57 public <T extends Op> T lookup(Class<T> clazz) {
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58 if (clazz == CanonicalizerOp.class) {
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59 return (T) CANONICALIZER;
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60 }
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61 return super.lookup(clazz);
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62 }
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63
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64 private static class XorCanonicalizerOp implements CanonicalizerOp {
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65 @Override
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66 public Node canonical(Node node) {
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67 assert node instanceof Xor;
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68 Xor xor = (Xor) node;
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69 CiKind kind = xor.kind;
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70 Graph graph = xor.graph();
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71 Value x = xor.x();
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72 Value y = xor.y();
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73 if (x == y) {
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74 if (kind == CiKind.Int) {
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75 return Constant.forInt(0, graph);
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76 } else {
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77 assert kind == CiKind.Long;
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78 return Constant.forLong(0L, graph);
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79 }
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80 }
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81 if (x.isConstant() && !y.isConstant()) {
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82 xor.swapOperands();
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83 Value t = y;
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84 y = x;
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85 x = t;
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86 }
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87 if (x.isConstant()) {
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88 if (kind == CiKind.Int) {
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89 return Constant.forInt(x.asConstant().asInt() ^ y.asConstant().asInt(), graph);
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90 } else {
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91 assert kind == CiKind.Long;
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92 return Constant.forLong(x.asConstant().asLong() ^ y.asConstant().asLong(), graph);
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93 }
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94 } else if (y.isConstant()) {
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95 if (kind == CiKind.Int) {
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96 int c = y.asConstant().asInt();
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97 if (c == 0) {
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98 return x;
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99 }
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100 } else {
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101 assert kind == CiKind.Long;
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102 long c = y.asConstant().asLong();
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103 if (c == 0) {
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104 return x;
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105 }
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106 }
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107 }
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108 return xor;
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109 }
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110 }
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111 }