Mercurial > hg > graal-jvmci-8
annotate graal/Compiler/src/com/sun/c1x/ir/SignificantBitOp.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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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 } |