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annotate libquadmath/math/lrintq.c @ 68:561a7518be6b

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update gcc-4.6
author Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date Sun, 21 Aug 2011 07:07:55 +0900
parents
children 04ced10e8804
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rev   line source
68
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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1 /* Round argument to nearest integral value according to current rounding
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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2 direction.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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3 Copyright (C) 1997, 1999, 2004, 2006 Free Software Foundation, Inc.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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4 This file is part of the GNU C Library.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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5 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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6 Jakub Jelinek <jj@ultra.linux.cz>, 1999.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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7
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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8 The GNU C Library is free software; you can redistribute it and/or
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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9 modify it under the terms of the GNU Lesser General Public
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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10 License as published by the Free Software Foundation; either
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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11 version 2.1 of the License, or (at your option) any later version.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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12
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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13 The GNU C Library is distributed in the hope that it will be useful,
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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16 Lesser General Public License for more details.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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17
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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18 You should have received a copy of the GNU Lesser General Public
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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19 License along with the GNU C Library; if not, write to the Free
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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20 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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21 02111-1307 USA. */
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22
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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23 #include "quadmath-imp.h"
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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24
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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25 static const __float128 two112[2] =
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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26 {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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27 5.19229685853482762853049632922009600E+33Q, /* 0x406F000000000000, 0 */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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28 -5.19229685853482762853049632922009600E+33Q /* 0xC06F000000000000, 0 */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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29 };
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30
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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31 long int
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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32 lrintq (__float128 x)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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33 {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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34 int32_t j0;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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35 uint64_t i0,i1;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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36 volatile __float128 w;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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37 __float128 t;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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38 long int result;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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39 int sx;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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40
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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41 GET_FLT128_WORDS64 (i0, i1, x);
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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42 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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43 sx = i0 >> 63;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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44 i0 &= 0x0000ffffffffffffLL;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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45 i0 |= 0x0001000000000000LL;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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46
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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47 if (j0 < 48)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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48 {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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49 w = two112[sx] + x;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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50 t = w - two112[sx];
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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51 GET_FLT128_WORDS64 (i0, i1, t);
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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52 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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53 i0 &= 0x0000ffffffffffffLL;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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54 i0 |= 0x0001000000000000LL;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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55
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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56 result = (j0 < 0 ? 0 : i0 >> (48 - j0));
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57 }
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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58 else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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59 {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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60 if (j0 >= 112)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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61 result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112));
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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62 else
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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63 {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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64 w = two112[sx] + x;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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65 t = w - two112[sx];
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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66 GET_FLT128_WORDS64 (i0, i1, t);
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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67 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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68 i0 &= 0x0000ffffffffffffLL;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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69 i0 |= 0x0001000000000000LL;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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70
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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71 if (j0 == 48)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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72 result = (long int) i0;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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73 else
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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74 result = ((long int) i0 << (j0 - 48)) | (i1 >> (112 - j0));
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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75 }
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76 }
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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77 else
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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78 {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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79 /* The number is too large. It is left implementation defined
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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80 what happens. */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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81 return (long int) x;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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82 }
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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83
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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84 return sx ? -result : result;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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85 }