Bradford J. Brown wrote:
>For some reason, I am at a loss to explain, a v21 P4 1.4 GHz
>factors significantely slower that a P3 v20 700MHz. Is there a
>reason, and solution, for this?
Hmmm... Good question...
AFAIK, the only change George has or is going to make in the
factoring code since v19... is to change the Athlon over to
use the P2/P3 code path... instead of the 486 code path...
Doing such will allow Athlons to trial-factor 2.5-3x faster...
There really isn't a whole lot more speed increase that can
be gained from the factoring code as a whole, AFAIK...
You will also notice a BIG speed decrease with trial-factoring
on ANY machine as you move from factoring up to 2^62... to
factoring up to 2^64... to factoring above 2^64... This is
expected with the extra instructions necessary to handle the
larger trial-factor sizes...
Eric
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