Mercurial > hg > graal-compiler
annotate agent/src/share/classes/sun/jvm/hotspot/utilities/Bits.java @ 18041:52b4284cb496
Merge with jdk8u20-b26
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 16:02:50 +0200 |
| parents | c18cbe5936b8 |
| children |
| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 2001, 2004, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.utilities; | |
| 26 | |
| 27 /** Bit manipulation routines */ | |
| 28 | |
| 29 public class Bits { | |
| 30 public static final int AllBits = ~0; | |
| 31 public static final int NoBits = 0; | |
| 32 public static final int OneBit = 1; | |
| 33 | |
| 34 public static final int BitsPerByte = 8; | |
| 35 public static final int BitsPerInt = 32; | |
| 36 | |
| 37 public static final int LogBytesPerInt = 2; | |
| 38 public static final int LogBytesPerLong = 3; | |
| 39 | |
| 40 | |
| 41 public static int setBits(int x, int m) { | |
| 42 return x | m; | |
| 43 } | |
| 44 | |
| 45 public static int clearBits(int x, int m) { | |
| 46 return x & ~m; | |
| 47 } | |
| 48 | |
| 49 public static int nthBit(int n) { | |
| 50 return (n > 32) ? 0 : (OneBit << n); | |
| 51 } | |
| 52 | |
| 53 public static int setNthBit(int x, int n) { | |
| 54 return setBits(x, nthBit(n)); | |
| 55 } | |
| 56 | |
| 57 public static int clearNthBit(int x, int n) { | |
| 58 return clearBits(x, nthBit(n)); | |
| 59 } | |
| 60 | |
| 61 public static boolean isSetNthBit(int word, int n) { | |
| 62 return maskBits(word, nthBit(n)) != NoBits; | |
| 63 } | |
| 64 | |
| 65 public static int rightNBits(int n) { | |
| 66 return (nthBit(n) - 1); | |
| 67 } | |
| 68 | |
| 69 public static int maskBits(int x, int m) { | |
| 70 return x & m; | |
| 71 } | |
| 72 | |
| 73 public static long maskBitsLong(long x, long m) { | |
| 74 return x & m; | |
| 75 } | |
| 76 | |
| 77 /** Returns integer round-up to the nearest multiple of s (s must be | |
| 78 a power of two) */ | |
| 79 public static int roundTo(int x, int s) { | |
| 80 int m = s - 1; | |
| 81 return maskBits(x + m, ~m); | |
| 82 } | |
| 83 } |