sysdeps/m68k/m680x0/fpu/s_llrintl.c

   1 /* Round argument to nearest integral value according to current rounding
   2    direction.
   3    Copyright (C) 1997-2023 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <math.h>
  21 #include <math_private.h>
  22 #include <libm-alias-ldouble.h>
  23 #include "mathimpl.h"
  24
  25 long long int
  26 __llrintl (long double x)
  27 {
  28   int32_t e, s;
  29   uint32_t h, l;
  30   long long int result;
  31
  32   x = __m81_u(__rintl) (x);
  33
  34   GET_LDOUBLE_WORDS (e, h, l, x);
  35
  36   s = e;
  37   e = (e & 0x7fff) - 0x3fff;
  38   if (e < 0)
  39     return 0;
  40
  41   if (e < 63)
  42     {
  43       if (e > 31)
  44         {
  45           l >>= 63 - e;
  46           l |= h << (e - 31);
  47           h >>= 63 - e;
  48           result = ((long long int) h << 32) | l;
  49         }
  50       else
  51         result = h >> (31 - e);
  52       if (s & 0x8000)
  53         result = -result;
  54     }
  55   else
  56     /* The number is too large or not finite.  The standard leaves it
  57        undefined what to return when the number is too large to fit in a
  58        `long long int'.  */
  59     result = -1LL;
  60
  61   return result;
  62 }
  63
  64 libm_alias_ldouble (__llrint, llrint)