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/* Copyright (C) 2011-2016 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 <math.h>
#include "math_private.h"
#if __UCLIBC_HAS_FENV__
#include <errno.h>
#endif
double
atan2 (double y, double x)
{
#if __UCLIBC_HAS_FENV__
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 (__builtin_expect (z == 0.0 && y != 0.0 && isfinite (x),0))
__set_errno (ERANGE);
return z;
#else
return __ieee754_atan2 (y, x);
#endif
}
libm_hidden_def(atan2)
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