/* Round long double value to long int.

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

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   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 <fenv.h>

#include <limits.h>

#include <math.h>

#include <math_private.h>

#include <libm-alias-ldouble.h>

long int

__lroundl (long double x)

{

  int32_t j0;

  uint32_t se, i1, i0;

  long int result;

  int sign;

  GET_LDOUBLE_WORDS (se, i0, i1, x);

  j0 = (se & 0x7fff) - 0x3fff;

  sign = (se & 0x8000) != 0 ? -1 : 1;

  if (j0 < 31)

    {

      if (j0 < 0)

	return j0 < -1 ? 0 : sign;

      else

	{

	  uint32_t j = i0 + (0x40000000 >> j0);

	  if (j < i0)

	    {

	      j >>= 1;

	      j |= 0x80000000;

	      ++j0;

	    }

	  result = j >> (31 - j0);

#ifdef FE_INVALID

	  if (sizeof (long int) == 4

	      && sign == 1

	      && result == LONG_MIN)

	    /* Rounding brought the value out of range.  */

	    feraiseexcept (FE_INVALID);

#endif

	}

    }

  else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)

    {

      if (j0 >= 63)

	result = ((long int) i0 << (j0 - 31)) | (i1 << (j0 - 63));

      else

	{

	  uint32_t j = i1 + (0x80000000 >> (j0 - 31));

	  unsigned long int ures = i0;

	  if (j < i1)

	    ++ures;

	  if (j0 == 31)

	    result = ures;

	  else

	    {

	      result = (ures << (j0 - 31)) | (j >> (63 - j0));

#ifdef FE_INVALID

	      if (sizeof (long int) == 8

		  && sign == 1

		  && result == LONG_MIN)

		/* Rounding brought the value out of range.  */

		feraiseexcept (FE_INVALID);

#endif

	    }

	}

    }

  else

    {

      /* The number is too large.  Unless it rounds to LONG_MIN,

	 FE_INVALID must be raised and the return value is

	 unspecified.  */

#ifdef FE_INVALID

      if (sizeof (long int) == 4

	  && x <= (long double) LONG_MIN - 0.5L)

	{

	  /* If truncation produces LONG_MIN, the cast will not raise

	     the exception, but may raise "inexact".  */

	  feraiseexcept (FE_INVALID);

	  return LONG_MIN;

	}

#endif

      return (long int) x;

    }

  return sign * result;

}

libm_alias_ldouble (__lround, lround)