/* 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 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>

static const long double two63[2] =

{

  9.223372036854775808000000e+18, /* 0x403E, 0x00000000, 0x00000000 */

 -9.223372036854775808000000e+18  /* 0xC03E, 0x00000000, 0x00000000 */

};

long int

__lrintl (long double x)

{

  int32_t se,j0;

  uint32_t i0, i1;

  long int result;

  long double w;

  long double t;

  int sx;

  GET_LDOUBLE_WORDS (se, i0, i1, x);

  sx = (se >> 15) & 1;

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

  if (j0 < 31)

    {

#if defined FE_INVALID || defined FE_INEXACT

      /* X < LONG_MAX + 1 implied by J0 < 31.  */

      if (sizeof (long int) == 4

	  && x > (long double) LONG_MAX)

	{

	  /* In the event of overflow we must raise the "invalid"

	     exception, but not "inexact".  */

	  t = __nearbyintl (x);

	  feraiseexcept (t == LONG_MAX ? FE_INEXACT : FE_INVALID);

	}

      else

#endif

	{

	  w = two63[sx] + x;

	  t = w - two63[sx];

	}

      GET_LDOUBLE_WORDS (se, i0, i1, t);

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

      result = (j0 < 0 ? 0 : i0 >> (31 - j0));

    }

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

    {

      if (j0 >= 63)

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

      else

	{

#if defined FE_INVALID || defined FE_INEXACT

	  /* X < LONG_MAX + 1 implied by J0 < 63.  */

	  if (sizeof (long int) == 8

	      && x > (long double) LONG_MAX)

	    {

	      /* In the event of overflow we must raise the "invalid"

		 exception, but not "inexact".  */

	      t = __nearbyintl (x);

	      feraiseexcept (t == LONG_MAX ? FE_INEXACT : FE_INVALID);

	    }

	  else

#endif

	    {

	      w = two63[sx] + x;

	      t = w - two63[sx];

	    }

	  GET_LDOUBLE_WORDS (se, i0, i1, t);

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

	  if (j0 == 31)

	    result = (long int) i0;

	  else

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

	}

    }

  else

    {

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

	 FE_INVALID must be raised and the return value is

	 unspecified.  */

#if defined FE_INVALID || defined FE_INEXACT

      if (sizeof (long int) == 4

	  && x < (long double) LONG_MIN

	  && x > (long double) LONG_MIN - 1.0L)

	{

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

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

	  t = __nearbyintl (x);

	  feraiseexcept (t == LONG_MIN ? FE_INEXACT : FE_INVALID);

	  return LONG_MIN;

	}

#endif

      return (long int) x;

    }

  return sx ? -result : result;

}

libm_alias_ldouble (__lrint, lrint)