diff options
Diffstat (limited to 'math/w_powl_compat.c')
| -rw-r--r-- | math/w_powl_compat.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/math/w_powl_compat.c b/math/w_powl_compat.c new file mode 100644 index 0000000000..60a89c2b42 --- /dev/null +++ b/math/w_powl_compat.c @@ -0,0 +1,60 @@ +/* Copyright (C) 2011-2017 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/>. */ + +#include <math.h> +#include <math_private.h> + + +/* wrapper powl */ +long double +__powl (long double x, long double y) +{ + long double z = __ieee754_powl (x, y); + if (__glibc_unlikely (!isfinite (z))) + { + if (_LIB_VERSION != _IEEE_) + { + 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) && x != 0 && isfinite (y) + && _LIB_VERSION != _IEEE_) + /* pow underflow */ + return __kernel_standard_l (x, y, 222); + + return z; +} +weak_alias (__powl, powl) |