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annotate libquadmath/printf/rshift.c @ 158:494b0b89df80 default tip

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 18:13:55 +0900
parents 561a7518be6b
children
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68
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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1 /* mpn_rshift -- Shift right a low-level natural-number integer.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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2
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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3 Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc.
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4
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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5 This file is part of the GNU MP Library.
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6
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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7 The GNU MP Library is free software; you can redistribute it and/or modify
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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8 it under the terms of the GNU Lesser General Public License as published by
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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9 the Free Software Foundation; either version 2.1 of the License, or (at your
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10 option) any later version.
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11
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12 The GNU MP Library is distributed in the hope that it will be useful, but
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13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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15 License for more details.
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16
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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17 You should have received a copy of the GNU Lesser General Public License
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18 along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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20 MA 02111-1307, USA. */
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21
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22 #include <config.h>
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23 #include "gmp-impl.h"
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24
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25 /* Shift U (pointed to by UP and USIZE limbs long) CNT bits to the right
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26 and store the USIZE least significant limbs of the result at WP.
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27 The bits shifted out to the right are returned.
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28
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29 Argument constraints:
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30 1. 0 < CNT < BITS_PER_MP_LIMB
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31 2. If the result is to be written over the input, WP must be <= UP.
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32 */
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33
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34 mp_limb_t
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35 #if __STDC__
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36 mpn_rshift (register mp_ptr wp,
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37 register mp_srcptr up, mp_size_t usize,
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38 register unsigned int cnt)
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39 #else
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40 mpn_rshift (wp, up, usize, cnt)
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41 register mp_ptr wp;
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42 register mp_srcptr up;
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43 mp_size_t usize;
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44 register unsigned int cnt;
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45 #endif
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46 {
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47 register mp_limb_t high_limb, low_limb;
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48 register unsigned sh_1, sh_2;
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49 register mp_size_t i;
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50 mp_limb_t retval;
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51
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52 #ifdef DEBUG
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53 if (usize == 0 || cnt == 0)
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54 abort ();
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55 #endif
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56
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57 sh_1 = cnt;
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58
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59 #if 0
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60 if (sh_1 == 0)
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61 {
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62 if (wp != up)
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63 {
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64 /* Copy from low end to high end, to allow specified input/output
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65 overlapping. */
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66 for (i = 0; i < usize; i++)
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67 wp[i] = up[i];
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68 }
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69 return usize;
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70 }
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71 #endif
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72
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73 wp -= 1;
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74 sh_2 = BITS_PER_MP_LIMB - sh_1;
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75 high_limb = up[0];
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76 retval = high_limb << sh_2;
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77 low_limb = high_limb;
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78
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79 for (i = 1; i < usize; i++)
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80 {
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81 high_limb = up[i];
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82 wp[i] = (low_limb >> sh_1) | (high_limb << sh_2);
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83 low_limb = high_limb;
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84 }
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85 wp[i] = low_limb >> sh_1;
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86
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87 return retval;
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88 }