/* 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/>.  */

/*

 * wrapper atan2(y,x)

 */

#include <errno.h>

#include <math.h>

#include <math_private.h>

#include <math-svid-compat.h>

#include <libm-alias-double.h>

#if LIBM_SVID_COMPAT

double

__atan2 (double y, double x)

{

  double z;

  if (__builtin_expect (x == 0.0 && y == 0.0, 0) && _LIB_VERSION == _SVID_)

    return __kernel_standard (y, x, 3); /* atan2(+-0,+-0) */

  z = __ieee754_atan2 (y, x);

  if (__glibc_unlikely (z == 0.0 && y != 0.0 && isfinite (x)))

    __set_errno (ERANGE);

  return z;

}

libm_alias_double (__atan2, atan2)

#endif