/* Round argument to nearest integral value according to current rounding

   direction.

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

   This file is part of the GNU C Library.

   Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>

   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 <math_private.h>

#include <libm-alias-double.h>

#include "mathimpl.h"

long long int

__llrint (double x)

{

  int32_t e;

  uint32_t h, l, s;

  long long int result;

  x = __m81_u(__rint) (x);

  /* We could use __fixxfdi from libgcc, but here we can take advantage of

     the known floating point format.  */

  EXTRACT_WORDS (h, l, x);

  e = ((h >> 20) & 0x7ff) - 0x3ff;

  if (e < 0)

    return 0;

  s = h;

  h &= 0xfffff;

  h |= 0x100000;

  if (e < 63)

    {

      if (e > 52)

	{

	  h <<= e - 52;

	  h |= l >> (84 - e);

	  l <<= e - 52;

	  result = ((long long int) h << 32) | l;

	}

      else if (e > 20)

	{

	  l >>= 52 - e;

	  l |= h << (e - 20);

	  h >>= 52 - e;

	  result = ((long long int) h << 32) | l;

	}

      else

	result = h >> (20 - e);

      if (s & 0x80000000)

	result = -result;

    }

  else

    /* The number is too large or not finite.  The standard leaves it

       undefined what to return when the number is too large to fit in a

       `long long int'.  */

    result = -1LL;

  return result;

}

libm_alias_double (__llrint, llrint)