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Diffstat (limited to 'libm/w_atan2.c')
-rw-r--r-- | libm/w_atan2.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/libm/w_atan2.c b/libm/w_atan2.c new file mode 100644 index 000000000..0c036e6ca --- /dev/null +++ b/libm/w_atan2.c @@ -0,0 +1,46 @@ +/* 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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