sysdeps/powerpc/fpu/s_llroundf.c

   1 /* Round float value to long long int.
   2    Copyright (C) 1997-2013 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 /* I think that what this routine is supposed to do is round a value
  22    to the nearest integer, with values exactly on the boundary rounded
  23    away from zero.  */
  24 /* This routine relies on (long long)x, when x is out of range of a long long,
  25    clipping to MAX_LLONG or MIN_LLONG.  */
  26
  27 long long int
  28 __llroundf (float x)
  29 {
  30   float xrf;
  31   long long int xr;
  32   xr = (long long int) x;
  33   xrf = (float) xr;
  34   if (x >= 0.0)
  35     if (x - xrf >= 0.5 && x - xrf < 1.0 && x+1 > 0)
  36       return x+1;
  37     else
  38       return x;
  39   else
  40     if (xrf - x >= 0.5 && xrf - x < 1.0 && x-1 < 0)
  41       return x-1;
  42     else
  43       return x;
  44 }
  45 weak_alias (__llroundf, llroundf)