Mercurial > projects > ldc
annotate druntime/import/core/bitmanip.di @ 760:6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
author | Tomas Lindquist Olsen <tomas.l.olsen@gmail.com> |
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date | Wed, 12 Nov 2008 00:19:18 +0100 |
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760
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
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1 /** |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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2 * This module contains a collection of bit-level operations. |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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3 * |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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4 * Copyright: Copyright (c) 2005-2008, The D Runtime Project |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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5 * License: BSD Style, see LICENSE |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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6 * Authors: Walter Bright, Don Clugston, Sean Kelly |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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7 */ |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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8 module bitmanip; |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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9 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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10 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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11 version( DDoc ) |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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12 { |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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13 /** |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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14 * Scans the bits in v starting with bit 0, looking |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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15 * for the first set bit. |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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16 * Returns: |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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17 * The bit number of the first bit set. |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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18 * The return value is undefined if v is zero. |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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19 */ |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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20 int bsf( uint v ); |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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21 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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22 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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23 /** |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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24 * Scans the bits in v from the most significant bit |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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25 * to the least significant bit, looking |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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26 * for the first set bit. |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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27 * Returns: |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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28 * The bit number of the first bit set. |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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29 * The return value is undefined if v is zero. |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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30 * Example: |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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31 * --- |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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32 * import bitmanip; |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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33 * |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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34 * int main() |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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35 * { |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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36 * uint v; |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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37 * int x; |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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38 * |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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39 * v = 0x21; |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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40 * x = bsf(v); |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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41 * printf("bsf(x%x) = %d\n", v, x); |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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42 * x = bsr(v); |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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43 * printf("bsr(x%x) = %d\n", v, x); |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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44 * return 0; |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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45 * } |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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46 * --- |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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47 * Output: |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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48 * bsf(x21) = 0<br> |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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49 * bsr(x21) = 5 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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50 */ |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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51 int bsr( uint v ); |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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52 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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53 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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54 /** |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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55 * Tests the bit. |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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56 */ |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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57 int bt( uint* p, uint bitnum ); |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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58 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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59 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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60 /** |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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61 * Tests and complements the bit. |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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62 */ |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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63 int btc( uint* p, uint bitnum ); |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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64 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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65 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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66 /** |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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67 * Tests and resets (sets to 0) the bit. |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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68 */ |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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69 int btr( uint* p, uint bitnum ); |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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70 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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71 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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72 /** |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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73 * Tests and sets the bit. |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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74 * Params: |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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75 * p = a non-NULL pointer to an array of uints. |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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76 * index = a bit number, starting with bit 0 of p[0], |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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77 * and progressing. It addresses bits like the expression: |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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78 --- |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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79 p[index / (uint.sizeof*8)] & (1 << (index & ((uint.sizeof*8) - 1))) |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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80 --- |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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81 * Returns: |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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82 * A non-zero value if the bit was set, and a zero |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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83 * if it was clear. |
6f33b427bfd1
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Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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84 * |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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85 * Example: |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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86 * --- |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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87 import bitmanip; |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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88 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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89 int main() |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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90 { |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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91 uint array[2]; |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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92 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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93 array[0] = 2; |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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94 array[1] = 0x100; |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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95 |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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96 printf("btc(array, 35) = %d\n", <b>btc</b>(array, 35)); |
6f33b427bfd1
Seems like hg ignores .di files, so I missed a bunch of stuff. complete druntime should be there now :)
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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97 printf("array = [0]:x%x, [1]:x%x\n", array[0], array[1]); |
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98 |
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99 printf("btc(array, 35) = %d\n", <b>btc</b>(array, 35)); |
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100 printf("array = [0]:x%x, [1]:x%x\n", array[0], array[1]); |
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101 |
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102 printf("bts(array, 35) = %d\n", <b>bts</b>(array, 35)); |
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103 printf("array = [0]:x%x, [1]:x%x\n", array[0], array[1]); |
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104 |
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105 printf("btr(array, 35) = %d\n", <b>btr</b>(array, 35)); |
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106 printf("array = [0]:x%x, [1]:x%x\n", array[0], array[1]); |
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107 |
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108 printf("bt(array, 1) = %d\n", <b>bt</b>(array, 1)); |
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109 printf("array = [0]:x%x, [1]:x%x\n", array[0], array[1]); |
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110 |
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111 return 0; |
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112 } |
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113 * --- |
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114 * Output: |
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115 <pre> |
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116 btc(array, 35) = 0 |
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117 array = [0]:x2, [1]:x108 |
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118 btc(array, 35) = -1 |
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119 array = [0]:x2, [1]:x100 |
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120 bts(array, 35) = 0 |
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121 array = [0]:x2, [1]:x108 |
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122 btr(array, 35) = -1 |
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123 array = [0]:x2, [1]:x100 |
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124 bt(array, 1) = -1 |
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125 array = [0]:x2, [1]:x100 |
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126 </pre> |
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127 */ |
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128 int bts( uint* p, uint bitnum ); |
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129 |
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130 |
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131 /** |
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132 * Swaps bytes in a 4 byte uint end-to-end, i.e. byte 0 becomes |
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133 * byte 3, byte 1 becomes byte 2, byte 2 becomes byte 1, byte 3 |
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134 * becomes byte 0. |
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135 */ |
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136 uint bswap( uint v ); |
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137 |
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138 |
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139 /** |
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140 * Reads I/O port at port_address. |
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141 */ |
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142 ubyte inp( uint port_address ); |
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143 |
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144 |
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145 /** |
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146 * ditto |
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147 */ |
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148 ushort inpw( uint port_address ); |
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149 |
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150 |
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151 /** |
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152 * ditto |
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153 */ |
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154 uint inpl( uint port_address ); |
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155 |
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156 |
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157 /** |
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158 * Writes and returns value to I/O port at port_address. |
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159 */ |
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160 ubyte outp( uint port_address, ubyte value ); |
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161 |
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162 |
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163 /** |
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164 * ditto |
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165 */ |
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166 ushort outpw( uint port_address, ushort value ); |
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167 |
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168 |
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169 /** |
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170 * ditto |
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171 */ |
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172 uint outpl( uint port_address, uint value ); |
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173 } |
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174 else |
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175 { |
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176 public import std.intrinsic; |
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177 } |
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178 |
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179 |
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180 /** |
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181 * Calculates the number of set bits in a 32-bit integer. |
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182 */ |
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183 int popcnt( uint x ) |
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184 { |
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185 // Avoid branches, and the potential for cache misses which |
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186 // could be incurred with a table lookup. |
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187 |
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188 // We need to mask alternate bits to prevent the |
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189 // sum from overflowing. |
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190 // add neighbouring bits. Each bit is 0 or 1. |
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191 x = x - ((x>>1) & 0x5555_5555); |
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192 // now each two bits of x is a number 00,01 or 10. |
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193 // now add neighbouring pairs |
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194 x = ((x&0xCCCC_CCCC)>>2) + (x&0x3333_3333); |
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195 // now each nibble holds 0000-0100. Adding them won't |
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196 // overflow any more, so we don't need to mask any more |
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197 |
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198 // Now add the nibbles, then the bytes, then the words |
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199 // We still need to mask to prevent double-counting. |
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200 // Note that if we used a rotate instead of a shift, we |
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201 // wouldn't need the masks, and could just divide the sum |
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202 // by 8 to account for the double-counting. |
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203 // On some CPUs, it may be faster to perform a multiply. |
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204 |
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205 x += (x>>4); |
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206 x &= 0x0F0F_0F0F; |
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207 x += (x>>8); |
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208 x &= 0x00FF_00FF; |
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209 x += (x>>16); |
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210 x &= 0xFFFF; |
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211 return x; |
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212 } |
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213 |
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214 |
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215 /** |
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216 * Reverses the order of bits in a 32-bit integer. |
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217 */ |
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218 uint bitswap( uint x ) |
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219 { |
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220 |
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221 version( D_InlineAsm_X86 ) |
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222 { |
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223 asm |
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224 { |
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225 // Author: Tiago Gasiba. |
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226 mov EDX, EAX; |
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227 shr EAX, 1; |
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228 and EDX, 0x5555_5555; |
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229 and EAX, 0x5555_5555; |
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230 shl EDX, 1; |
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231 or EAX, EDX; |
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232 mov EDX, EAX; |
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233 shr EAX, 2; |
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234 and EDX, 0x3333_3333; |
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235 and EAX, 0x3333_3333; |
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236 shl EDX, 2; |
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237 or EAX, EDX; |
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238 mov EDX, EAX; |
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239 shr EAX, 4; |
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240 and EDX, 0x0f0f_0f0f; |
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241 and EAX, 0x0f0f_0f0f; |
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242 shl EDX, 4; |
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243 or EAX, EDX; |
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244 bswap EAX; |
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245 } |
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246 } |
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247 else |
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248 { |
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249 // swap odd and even bits |
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250 x = ((x >> 1) & 0x5555_5555) | ((x & 0x5555_5555) << 1); |
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251 // swap consecutive pairs |
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252 x = ((x >> 2) & 0x3333_3333) | ((x & 0x3333_3333) << 2); |
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253 // swap nibbles |
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254 x = ((x >> 4) & 0x0F0F_0F0F) | ((x & 0x0F0F_0F0F) << 4); |
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255 // swap bytes |
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256 x = ((x >> 8) & 0x00FF_00FF) | ((x & 0x00FF_00FF) << 8); |
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257 // swap 2-byte long pairs |
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258 x = ( x >> 16 ) | ( x << 16); |
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259 return x; |
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260 |
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261 } |
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262 } |