[PATCH] msvcrt: Add fallback implementations for Bessel functions

[Alex Henrie]

2018-03-02 7:31 GMT-07:00 Piotr Caban <piotr.caban at gmail.com>:
> This approximation can only be used for values in specific range to give
> reasonable results. There are similar problems with j0, j1 fallbacks (I
> haven't checked other functions).
>
> I think it's better to print FIXME instead of adding very inaccurate
> fallback. Taking in account the functions are probably mainly used for
> physics related computations I guess it's better to avoid inaccurate
> implementation at all.

That's fair for jn, y0, y1, and yn. However, the j0 and j1 fallbacks
are exactly correct, as far as I can tell. What values of x did you
test? Did you accidentally have your calculator set to use degrees
instead of radians?

-Alex