diff options
Diffstat (limited to 'math/w_exp2f.c')
-rw-r--r-- | math/w_exp2f.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/math/w_exp2f.c b/math/w_exp2f.c new file mode 100644 index 0000000..d2c340d --- /dev/null +++ b/math/w_exp2f.c @@ -0,0 +1,32 @@ +/* + * wrapper exp2f(x) + */ + +#include <float.h> +#include "math.h" +#include "math_private.h" + +static const float o_threshold= (float) FLT_MAX_EXP; +static const float u_threshold= (float) FLT_MIN_EXP; + +float +__exp2f (float x) /* wrapper exp2f */ +{ +#ifdef _IEEE_LIBM + return __ieee754_exp2f (x); +#else + float z; + z = __ieee754_exp2f (x); + if (_LIB_VERSION != _IEEE_ && __finitef (x)) + { + if (x > o_threshold) + /* exp2 overflow */ + return (float) __kernel_standard ((double) x, (double) x, 144); + else if (x < u_threshold) + /* exp2 underflow */ + return (float) __kernel_standard ((double) x, (double) x, 145); + } + return z; +#endif +} +weak_alias (__exp2f, exp2f) |