From ea38f4d89c9698895b1cf53a5946429dc1d8bbaa Mon Sep 17 00:00:00 2001 From: Sergey Cherkashin <4erkashin@list.ru> Date: Tue, 3 Oct 2017 15:26:34 +0300 Subject: math: add exception handling functionality According to standards SVID and SYSV. Modified lgamma calling in case when 'signgam' variable should not be used. Signed-off-by: Waldemar Brodkorb --- libm/w_atan2.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 libm/w_atan2.c (limited to 'libm/w_atan2.c') 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 , 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 + . */ + +/* + * wrapper atan2(y,x) + */ + +#include +#include "math_private.h" +#if __UCLIBC_HAS_FENV__ +#include +#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) \ No newline at end of file -- cgit v1.2.3