Pentium and Repentium
user42 at zip.com.au
Sat Mar 20 22:14:56 CET 2004
Torbjorn Granlund <tg at swox.com> writes:
> I'd expect we could get things to run well on this processor with
> some software pipelining. Our current code relies on out-of-order
> execution, but Prescott's out-of-order capability seems
> insufficient for its over 30 steps deep pipeline.
There's some spare registers in most funcs, but not a lot.
> mpn_lshift 1.87 2.12
The aim there is 1.5 c/l, being 3 mmx insns for each 2 limbs. I don't
know why it doesn't run at that pace now, in fact. Probably
More information about the gmp-devel