sysdeps/powerpc/fpu/s_rintf.c

   1 /* Round a 32-bit floating point value to the nearest integer.
   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 float
  22 __rintf (float x)
  23 {
  24   static const float TWO23 = 8388608.0;
  25
  26   if (fabsf (x) < TWO23)
  27     {
  28       if (x > 0.0)
  29         {
  30           x += TWO23;
  31           x -= TWO23;
  32         }
  33       else if (x < 0.0)
  34         {
  35           x = TWO23 - x;
  36           x = -(x - TWO23);
  37         }
  38     }
  39
  40   return x;
  41 }
  42 weak_alias (__rintf, rintf)