/* Round a 64-bit floating point value to the nearest integer.

   Copyright (C) 1997-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <math.h>

#include <libm-alias-double.h>

double

__rint (double x)

{

  static const float TWO52 = 4503599627370496.0;

  if (fabs (x) < TWO52)

    {

      if (x > 0.0)

	{

	  x += TWO52;

	  x -= TWO52;

	}

      else if (x < 0.0)

	{

	  x = TWO52 - x;

	  x = -(x - TWO52);

	}

    }

  return x;

}

libm_alias_double (__rint, rint)