[mjcohen]

To go with that, you need ln(1+x). HP calculators had both.

[jjgreen]

As has C (since C99)

http://www.cplusplus.com/reference/cmath/log1p/

[olliej]

I believe that they're all part of the IEEE 754 spec, but some of these functions are just recommended.

x87 has pretty much all of them, including two remainder implementations \o/

[olliej]

I did implement that, and sqrt, etc. With integer math because the misery of needing more precision :D (or is that :( ? )