You can change base with a single multiplication by special constants if you accept 1ULP error, so working in one or the other doesn't really gain you much. But

You can change base with a single multiplication by special constants if you accept 1ULP error, so working in one or the other doesn't really gain you much. But exp/logs are often implemented as a combination of a table lookup and polys, so you can just bake it into the constants even more easily.