long double __far expl(long double x); (C99)
expl returns 0 or an denormal number if an underflow occurs, and sets macro ERANGE to global variable errno.
If an overflow occurs, expl returns ∞ and sets macro ERANGE to global variable errno.
This function calculates the xth power of e (e is the base of a natural logarithm and is about 2.71828).