/* 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-narrow-eval.h>

#include <math_private.h>

#include <libm-alias-float.h>

#include <fix-fp-int-convert-overflow.h>

static const float two23[2] =

{

  8.3886080000e+06, /* 0x4B000000 */

 -8.3886080000e+06, /* 0xCB000000 */

};

long int

__lrintf (float x)

{

  int32_t j0;

  uint32_t i0;

  float w;

  float t;

  long int result;

  int sx;

  GET_FLOAT_WORD (i0, x);

  sx = i0 >> 31;

  j0 = ((i0 >> 23) & 0xff) - 0x7f;

  i0 &= 0x7fffff;

  i0 |= 0x800000;

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

    {

      if (j0 >= 23)

	result = (long int) i0 << (j0 - 23);

      else

	{

	  w = math_narrow_eval (two23[sx] + x);

	  t = w - two23[sx];

	  GET_FLOAT_WORD (i0, t);

	  j0 = ((i0 >> 23) & 0xff) - 0x7f;

	  i0 &= 0x7fffff;

	  i0 |= 0x800000;

	  result = (j0 < 0 ? 0 : i0 >> (23 - j0));

	}

    }

  else

    {

#ifdef FE_INVALID

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

	 FE_INVALID must be raised and the return value is

	 unspecified.  */

      if (FIX_FLT_LONG_CONVERT_OVERFLOW && x != (float) LONG_MIN)

	{

	  feraiseexcept (FE_INVALID);

	  return sx == 0 ? LONG_MAX : LONG_MIN;

	}

#endif

      return (long int) x;

    }

  return sx ? -result : result;

}

libm_alias_float (__lrint, lrint)