sysdeps/m68k/m680x0/fpu/s_llrintl.c

   1 /* Round argument to nearest integral value according to current rounding
   2    direction.
   3    Copyright (C) 1997-2019 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library.  If not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <math.h>
  22 #include <math_private.h>
  23 #include <libm-alias-ldouble.h>
  24 #include "mathimpl.h"
  25
  26 long long int
  27 __llrintl (long double x)
  28 {
  29   int32_t e, s;
  30   uint32_t h, l;
  31   long long int result;
  32
  33   x = __m81_u(__rintl) (x);
  34
  35   GET_LDOUBLE_WORDS (e, h, l, x);
  36
  37   s = e;
  38   e = (e & 0x7fff) - 0x3fff;
  39   if (e < 0)
  40     return 0;
  41
  42   if (e < 63)
  43     {
  44       if (e > 31)
  45         {
  46           l >>= 63 - e;
  47           l |= h << (e - 31);
  48           h >>= 63 - e;
  49           result = ((long long int) h << 32) | l;
  50         }
  51       else
  52         result = h >> (31 - e);
  53       if (s & 0x8000)
  54         result = -result;
  55     }
  56   else
  57     /* The number is too large or not finite.  The standard leaves it
  58        undefined what to return when the number is too large to fit in a
  59        `long long int'.  */
  60     result = -1LL;
  61
  62   return result;
  63 }
  64
  65 libm_alias_ldouble (__llrint, llrint)