/* 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 <errno.h>

#include <math.h>

#include <math_private.h>

#include <math-svid-compat.h>

#if LIBM_SVID_COMPAT

static long double

__attribute__ ((noinline))

sysv_scalbl (long double x, long double fn)

{

  long double z = __ieee754_scalbl (x, fn);

  if (__glibc_unlikely (isinf (z)))

    {

      if (isfinite (x))

	return __kernel_standard_l (x, fn, 232); /* scalb overflow */

      else

	__set_errno (ERANGE);

    }

  else if (__builtin_expect (z == 0.0L, 0) && z != x)

    return __kernel_standard_l (x, fn, 233); /* scalb underflow */

  return z;

}

#endif

/* Wrapper scalbl */

long double

__scalbl (long double x, long double fn)

{

#if LIBM_SVID_COMPAT

  if (__glibc_unlikely (_LIB_VERSION == _SVID_))

    return sysv_scalbl (x, fn);

  else

#endif

    {

      long double z = __ieee754_scalbl (x, fn);

      if (__glibc_unlikely (!isfinite (z) || z == 0.0L))

	{

	  if (isnan (z))

	    {

	      if (!isnan (x) && !isnan (fn))

		__set_errno (EDOM);

	    }

	  else if (isinf (z))

	    {

	      if (!isinf (x) && !isinf (fn))

		__set_errno (ERANGE);

	    }

	  else

	    {

	      /* z == 0.  */

	      if (x != 0.0L && !isinf (fn))

		__set_errno (ERANGE);

	    }

	}

      return z;

    }

}

weak_alias (__scalbl, scalbl)