/* Copyright (C) 2011-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.

   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 <math.h>

#include <math_private.h>

#include <math-svid-compat.h>

#include <libm-alias-ldouble.h>

#if LIBM_SVID_COMPAT

/* wrapper log2l(x) */

long double

__log2l (long double x)

{

  if (__builtin_expect (islessequal (x, 0.0L), 0) && _LIB_VERSION != _IEEE_)

    {

      if (x == 0.0L)

	{

	  feraiseexcept (FE_DIVBYZERO);

	  return __kernel_standard_l (x, x, 248); /* log2(0) */

	}

      else

	{

	  feraiseexcept (FE_INVALID);

	  return __kernel_standard_l (x, x, 249); /* log2(x<0) */

	}

    }

  return  __ieee754_log2l (x);

}

libm_alias_ldouble (__log2, log2)

#endif