On Tuesday 18 June 2013 15:43:48 Florian Apolloner wrote:
> Does this give a big speed improvement?

When I worked on this last September, I thought it did. It may have been
a measurement error; I will check this again.

> it needs a comment to describe what
> it does and a more saying name than "D" would also be good.
> 
I thought it's clear enough, obviously I was wrong. If it is indeed worth it, 
I'll fix this.