ports/sysdeps/m68k/m680x0/fpu/s_llrintf.c

   1 /* Round argument to nearest integral value according to current rounding
   2    direction.
   3    Copyright (C) 1997-2014 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 "mathimpl.h"
  24
  25 long long int
  26 __llrintf (float x)
  27 {
  28   int32_t e;
  29   u_int32_t i, s;
  30   long long int result;
  31
  32   x = __m81_u(__rintf) (x);
  33
  34   GET_FLOAT_WORD (i, x);
  35
  36   e = ((i >> 23) & 0xff) - 0x7f;
  37   if (e < 0)
  38     return 0;
  39   s = i;
  40   i &= 0x7fffff;
  41   i |= 0x800000;
  42
  43   if (e < 63)
  44     {
  45       if (e > 55)
  46         result = (long long int) (i << (e - 55)) << 32;
  47       else if (e > 31)
  48         result = (((long long int) (i >> (55 - e)) << 32) | (i << (e - 23)));
  49       else if (e > 23)
  50         result = i << (e - 23);
  51       else
  52         result = i >> (23 - e);
  53       if (s & 0x80000000)
  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 weak_alias (__llrintf, llrintf)