crc32() optimization

[Joakim Tjernlund]

> In message <001301c28909$743f1f40$0200a8c0 at telia.com> you wrote:
> > I could not wait until tomorrow, so I did it now instead.
> > The result was worse. The best I got was 7% improvement.
> > I tried 16, 8, 6 and 4 as unrolling steps.
> 
> Makes no sense to me.  Should  be  at  least  as  efficient  as  your
> original code (marginally better).

I don't understand this either.
Anyone?

         Jocke