diff options
author | Sergey Cherkashin <4erkashin@list.ru> | 2017-10-03 15:26:34 +0300 |
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committer | Waldemar Brodkorb <wbx@uclibc-ng.org> | 2017-11-03 20:23:10 +0100 |
commit | ea38f4d89c9698895b1cf53a5946429dc1d8bbaa (patch) | |
tree | e05828ca1fedf55f104b837bc9c44215c2978e99 /libm/w_expf.c | |
parent | 68de9946e914d8c30dcc6667a059ea59e5b74cac (diff) |
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 <wbx@uclibc-ng.org>
Diffstat (limited to 'libm/w_expf.c')
-rw-r--r-- | libm/w_expf.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/libm/w_expf.c b/libm/w_expf.c new file mode 100644 index 000000000..5455a24b4 --- /dev/null +++ b/libm/w_expf.c @@ -0,0 +1,38 @@ +/* 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 expf */ + +#include <math.h> +#include "math_private.h" + +float +expf (float x) +{ +#if __UCLIBC_HAS_FENV__ + float z = (float) __ieee754_exp ((double) x); + if (__builtin_expect (!isfinite (z) || z == 0, 0) + && isfinite (x) && _LIB_VERSION != _IEEE_) + return __kernel_standard_f (x, x, 106 + !!signbit (x)); + + return z; +#else + return (float) __ieee754_exp ((double) x); +#endif +} |