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_powl.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 libm/w_powl.c (limited to 'libm/w_powl.c') diff --git a/libm/w_powl.c b/libm/w_powl.c new file mode 100644 index 000000000..bd8c44393 --- /dev/null +++ b/libm/w_powl.c @@ -0,0 +1,78 @@ +/* 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 !defined __NO_LONG_DOUBLE_MATH +/* wrapper powl */ +long double +powl (long double x, long double y) +{ +#if __UCLIBC_HAS_FENV__ + long double z = (long double) __ieee754_pow ((double) x, (double) y); + if (__builtin_expect (!isfinite (z), 0)) + { + if (_LIB_VERSION != _IEEE_) + { + if (isnan (x)) + { + if (y == 0.0L) + /* pow(NaN,0.0) */ + return __kernel_standard_l (x, y, 242); + } + else if (isfinite (x) && isfinite (y)) + { + if (isnan (z)) + /* pow neg**non-int */ + return __kernel_standard_l (x, y, 224); + else if (x == 0.0L && y < 0.0L) + { + if (signbit (x) && signbit (z)) + /* pow(-0.0,negative) */ + return __kernel_standard_l (x, y, 223); + else + /* pow(+0.0,negative) */ + return __kernel_standard_l (x, y, 243); + } + else + /* pow overflow */ + return __kernel_standard_l (x, y, 221); + } + } + } + else if (__builtin_expect (z == 0.0L, 0) && isfinite (x) && isfinite (y) + && _LIB_VERSION != _IEEE_) + { + if (x == 0.0L) + { + if (y == 0.0L) + /* pow(0.0,0.0) */ + return __kernel_standard_l (x, y, 220); + } + else + /* pow underflow */ + return __kernel_standard_l (x, y, 222); + } + + return z; +# else + return (long double) __ieee754_pow ((double) x, (double) y); +# endif /* __UCLIBC_HAS_FENV__ */ +} +#endif /* __NO_LONG_DOUBLE_MATH */ -- cgit v1.2.3