2-adic Svoboda

[Paul Zimmermann]

       Dear Torbjörn,

> Without invariance from e.g modexp, I don't believe one can beat
> sbpi1_bdiv_r (or the older redc_1).  Newer implementation of
> sbpi1_bdiv_r make use of the observation that the next quotient can be
> computed early, actually almost a whole innerloop invocation early,
> which makes its cost very low.

of course I was thinking in the invariant case. I'm looking forward seeing
sbpi1_bdiv_r in the public interface, this would be very interesting in GMP-ECM
for example.

Paul