/* 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 defined(__UCLIBC_HAS_FENV__) #include <errno.h> #endif double atan2 (double y, double x) { #if defined(__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)