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_jn.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 libm/w_jn.c (limited to 'libm/w_jn.c') diff --git a/libm/w_jn.c b/libm/w_jn.c new file mode 100644 index 000000000..404a76afd --- /dev/null +++ b/libm/w_jn.c @@ -0,0 +1,63 @@ +/* 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 + . */ + +#include +#include "math_private.h" +#if __UCLIBC_HAS_FENV__ +#include +#endif +/* wrapper jn */ +double +jn (int n, double x) +{ +#if __UCLIBC_HAS_FENV__ + if (__builtin_expect (isgreater (fabs (x), X_TLOSS), 0) + && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_) + /* jn(n,|x|>X_TLOSS) */ + return __kernel_standard (n, x, 38); +#endif /* __UCLIBC_HAS_FENV__ */ + return __ieee754_jn (n, x); +} + +/* wrapper yn */ +double +yn (int n, double x) +{ +#if __UCLIBC_HAS_FENV__ + if (__builtin_expect (islessequal (x, 0.0) || isgreater (x, X_TLOSS), 0) + && _LIB_VERSION != _IEEE_) + { + if (x < 0.0) + { + /* d = zero/(x-x) */ + feraiseexcept (FE_INVALID); + return __kernel_standard (n, x, 13); + } + else if (x == 0.0) + { + /* d = -one/(x-x) */ + feraiseexcept (FE_DIVBYZERO); + return __kernel_standard (n, x, 12); + } + else if (_LIB_VERSION != _POSIX_) + /* yn(n,x>X_TLOSS) */ + return __kernel_standard (n, x, 39); + } +#endif /* __UCLIBC_HAS_FENV__ */ + return __ieee754_yn (n, x); +} -- cgit v1.2.3