sysdeps/powerpc/fpu/s_llroundf.c

   1 /* Round float value to long long int.
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <math.h>
  20
  21 /* Round to the nearest integer, with values exactly on a 0.5 boundary
  22    rounded away from zero, regardless of the current rounding mode.
  23    If (long long)x, when x is out of range of a long long, clips at
  24    LLONG_MAX or LLONG_MIN, then this implementation also clips.  */
  25
  26 long long int
  27 __llroundf (float x)
  28 {
  29   long long xr = (long long) x;
  30   float xrf = (float) xr;
  31
  32   if (x >= 0.0)
  33     {
  34       if (x - xrf >= 0.5)
  35         xr += (long long) ((unsigned long long) xr + 1) > 0;
  36     }
  37   else
  38     {
  39       if (xrf - x >= 0.5)
  40         xr -= (long long) ((unsigned long long) xr - 1) < 0;
  41     }
  42   return xr;
  43 }
  44 weak_alias (__llroundf, llroundf)