Re: [announce] [patch] ultra-scalable O(1) SMP and UP scheduler

Ingo Molnar
2002-01-06T02:22:08Z

On Sun, 6 Jan 2002, Alan Cox wrote:

> There are better algorithms than the branching one already. You can do
> it a 32bit one with a multiply shift and 6 bit lookup if your multiply
> is ok, or for non superscalar processors using shift and adds.
>
> 64bit is 32bit ffz(x.low|x.high) and a single bit test

ok - i wasnt thinking straight. as few branches as possible should be the
way to go, no BTB will help such functions so branches must be reduced.

Ingo