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| Rev | Author | Line No. | Line |
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| 1702 | - | 1 | /* Copyright (c) 2007, Dmitry Xmelkov |
| 2 | All rights reserved. |
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| 3 | |||
| 4 | Redistribution and use in source and binary forms, with or without |
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| 5 | modification, are permitted provided that the following conditions are met: |
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| 6 | |||
| 7 | * Redistributions of source code must retain the above copyright |
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| 8 | notice, this list of conditions and the following disclaimer. |
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| 9 | * Redistributions in binary form must reproduce the above copyright |
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| 10 | notice, this list of conditions and the following disclaimer in |
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| 11 | the documentation and/or other materials provided with the |
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| 12 | distribution. |
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| 13 | * Neither the name of the copyright holders nor the names of |
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| 14 | contributors may be used to endorse or promote products derived |
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| 15 | from this software without specific prior written permission. |
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| 16 | |||
| 17 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| 18 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 19 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 20 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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| 21 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 22 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 23 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 24 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 25 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 26 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 27 | POSSIBILITY OF SUCH DAMAGE. */ |
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| 28 | |||
| 29 | /* $Id: ntz.h 1217 2007-02-18 13:18:05Z dmix $ */ |
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| 30 | |||
| 31 | #ifndef _NTZ_H |
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| 32 | #define _NTZ_H |
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| 33 | |||
| 34 | /* Number of Tail Zeros: ntz(x)= (ffs(x) ? ffs(x)-1 : 16) |
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| 35 | It works with all: cpp, gcc and gas expressions. */ |
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| 36 | #define ntz(x) \ |
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| 37 | ( (1 & (((x) & 1) == 0)) \ |
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| 38 | + (1 & (((x) & 3) == 0)) \ |
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| 39 | + (1 & (((x) & 7) == 0)) \ |
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| 40 | + (1 & (((x) & 017) == 0)) \ |
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| 41 | + (1 & (((x) & 037) == 0)) \ |
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| 42 | + (1 & (((x) & 077) == 0)) \ |
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| 43 | + (1 & (((x) & 0177) == 0)) \ |
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| 44 | + (1 & (((x) & 0377) == 0)) \ |
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| 45 | + (1 & (((x) & 0777) == 0)) \ |
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| 46 | + (1 & (((x) & 01777) == 0)) \ |
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| 47 | + (1 & (((x) & 03777) == 0)) \ |
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| 48 | + (1 & (((x) & 07777) == 0)) \ |
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| 49 | + (1 & (((x) & 017777) == 0)) \ |
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| 50 | + (1 & (((x) & 037777) == 0)) \ |
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| 51 | + (1 & (((x) & 077777) == 0)) \ |
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| 52 | + (1 & (((x) & 0177777) == 0)) ) |
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| 53 | |||
| 54 | #endif /* !_NTZ_H */ |