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_exp2l.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 libm/w_exp2l.c (limited to 'libm/w_exp2l.c') 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 +#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 */ -- cgit v1.2.3