/* Round to int long double floating-point values.

   IBM extended format long double version.

   Copyright (C) 2006-2018 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/>.  */

/* This has been coded in assembler because GCC makes such a mess of it

   when it's coded in C.  */

#include <math.h>

#include <math_private.h>

#include <math_ldbl_opt.h>

#include <float.h>

#include <ieee754.h>

long double

__roundl (long double x)

{

  double xh, xl, hi, lo;

  ldbl_unpack (x, &xh, &xl);

  /* Return Inf, Nan, +/-0 unchanged.  */

  if (__builtin_expect (xh != 0.0

			&& __builtin_isless (__builtin_fabs (xh),

					     __builtin_inf ()), 1))

    {

      hi = __round (xh);

      if (hi != xh)

	{

	  /* The high part is not an integer; the low part only

	     affects the result if the high part is exactly half way

	     between two integers and the low part is nonzero with the

	     opposite sign.  */

	  if (fabs (hi - xh) == 0.5)

	    {

	      if (xh > 0 && xl < 0)

		xh = hi - 1;

	      else if (xh < 0 && xl > 0)

		xh = hi + 1;

	      else

		xh = hi;

	    }

	  else

	    xh = hi;

	  xl = 0;

	}

      else

	{

	  /* The high part is a nonzero integer.  */

	  lo = __round (xl);

	  if (fabs (lo - xl) == 0.5)

	    {

	      if (xh > 0 && xl < 0)

		xl = lo + 1;

	      else if (xh < 0 && lo > 0)

		xl = lo - 1;

	      else

		xl = lo;

	    }

	  else

	    xl = lo;

	  xh = hi;

	  ldbl_canonicalize_int (&xh, &xl);

	}

    }

  else

    /* Quiet signaling NaN arguments.  */

    xh += xh;

  return ldbl_pack (xh, xl);

}

long_double_symbol (libm, __roundl, roundl);