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annotate graal/GraalCompiler/src/com/sun/c1x/ir/SignificantBitOp.java @ 2509:16b9a8b5ad39

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Renamings Runtime=>GraalRuntime and Compiler=>GraalCompiler
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:50:44 +0200
parents graal/Compiler/src/com/sun/c1x/ir/SignificantBitOp.java@9ec15d6914ca
children
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1 /*
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2 * Copyright (c) 2010, 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.sun.c1x.debug.*;
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26 import com.sun.c1x.util.*;
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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 /**
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31 * Implements the {@link Bytecodes#LSB} and {@link Bytecodes#MSB} instructions.
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32 *
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33 * @author Laurent Daynes
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34 */
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35 public class SignificantBitOp extends Instruction {
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36 Value value;
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37
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38 /**
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39 * This will be {@link Bytecodes#LSB} or {@link Bytecodes#MSB}.
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40 */
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41 public final int op;
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42
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43 /**
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44 * Create a a new SignificantBitOp instance.
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45 *
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46 * @param value the instruction producing the value that is input to this instruction
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47 * @param opcodeop either {@link Bytecodes#LSB} or {@link Bytecodes#MSB}
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48 */
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49 public SignificantBitOp(Value value, int opcodeop) {
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50 super(CiKind.Int);
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51 assert opcodeop == Bytecodes.LSB || opcodeop == Bytecodes.MSB;
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52 this.value = value;
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53 this.op = opcodeop;
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54 }
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55
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56 /**
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57 * Gets the instruction producing input to this instruction.
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58 * @return the instruction that produces this instruction's input
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59 */
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60 public Value value() {
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61 return value;
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62 }
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63
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64 @Override
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65 public void inputValuesDo(ValueClosure closure) {
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66 value = closure.apply(value);
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67 }
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68
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69 @Override
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70 public void accept(ValueVisitor v) {
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71 v.visitSignificantBit(this);
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72 }
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73
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74 @Override
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75 public int valueNumber() {
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76 return Util.hash1(op, value);
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77 }
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78
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79 @Override
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80 public boolean valueEqual(Instruction i) {
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81 if (i instanceof SignificantBitOp) {
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82 SignificantBitOp o = (SignificantBitOp) i;
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83 // FIXME: this is a conservative estimate. If x is a single-bit value
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84 // (i.e., a power of 2), then the values are equal regardless of the value of the most field.
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85 return value == o.value && op == o.op;
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86 }
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87 return false;
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88 }
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89
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90 @Override
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91 public void print(LogStream out) {
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92 out.print(Bytecodes.nameOf(op) + " [").print(this).print("] ");
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93 }
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94 }