Fast exponentials
Representations of 2(x) by means of first and third degree polynomials yield e(x) values to 6-12 and 13-15 significant figures, respectively. The full range of arguments is reached through a set of precalculated values of 2(a). A Fortran implementation is shown to be much faster than the intrinsic exp function of several Fortran mathematical libraries. (C) 2001 Elsevier Science B.V. All rights reserved.
mathematical library benchmark exponential fortran intrinsic function