diff options
| author | Sergey Cherkashin <4erkashin@list.ru> | 2017-10-03 15:26:34 +0300 |
|---|---|---|
| committer | Waldemar Brodkorb <wbx@uclibc-ng.org> | 2017-11-03 20:23:10 +0100 |
| commit | ea38f4d89c9698895b1cf53a5946429dc1d8bbaa (patch) | |
| tree | e05828ca1fedf55f104b837bc9c44215c2978e99 /libm/w_exp2l.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_exp2l.c')
| -rw-r--r-- | libm/w_exp2l.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/libm/w_exp2l.c b/libm/w_exp2l.c new file mode 100644 index 000000000..ebf410daa --- /dev/null +++ b/libm/w_exp2l.c @@ -0,0 +1,24 @@ +/* + * wrapper exp2l(x) + */ + +#include <math.h> +#include "math_private.h" + +#if !defined __NO_LONG_DOUBLE_MATH +long double +exp2l (long double x) +{ +# if __UCLIBC_HAS_FENV__ + long double z = (long double) pow(2.0, (double) x); + if (__builtin_expect (!isfinite (z) || z == 0, 0) + && isfinite (x) && _LIB_VERSION != _IEEE_) + /* exp2 overflow: 244, exp2 underflow: 245 */ + return __kernel_standard_l (x, x, 244 + !!signbit (x)); + + return z; +# else + return (long double) pow(2.0, (double) x); +# endif /* __UCLIBC_HAS_FENV__ */ +} +#endif /* __NO_LONG_DOUBLE_MATH */ |