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_exp2f.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_exp2f.c')
| -rw-r--r-- | libm/w_exp2f.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/libm/w_exp2f.c b/libm/w_exp2f.c new file mode 100644 index 000000000..8c337cd98 --- /dev/null +++ b/libm/w_exp2f.c @@ -0,0 +1,22 @@ +/* + * wrapper exp2f(x) + */ + +#include <math.h> +#include "math_private.h" + +float +exp2f (float x) +{ +#if __UCLIBC_HAS_FENV__ + float z = (float) pow(2.0, (double) x); + if (__builtin_expect (!isfinite (z) || z == 0, 0) + && isfinite (x) && _LIB_VERSION != _IEEE_) + /* exp2 overflow: 144, exp2 underflow: 145 */ + return __kernel_standard_f (x, x, 144 + !!signbit (x)); + + return z; +#else + return (float) pow(2.0, (double) x); +#endif +}
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