/* Wrapper to implement llogb in terms of ilogb.

   Copyright (C) 2012-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   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 <errno.h>

#include <limits.h>

#include <math_private.h>

long int

M_DECL_FUNC (__llogb) (FLOAT x)

{

  int r = M_SUF (__ieee754_ilogb) (x);

  long int lr = r;

  if (__glibc_unlikely (r == FP_ILOGB0)

      || __glibc_unlikely (r == FP_ILOGBNAN)

      || __glibc_unlikely (r == INT_MAX))

    {

#if LONG_MAX != INT_MAX

      if (r == FP_ILOGB0)

	lr = FP_LLOGB0;

      else if (r == FP_ILOGBNAN)

	lr = FP_LLOGBNAN;

      else

	lr = LONG_MAX;

#endif

      __set_errno (EDOM);

      __feraiseexcept (FE_INVALID);

    }

  return lr;

}

declare_mgen_alias (__llogb, llogb)