> On Mer, 2003-04-30 at 17:16, Linus Torvalds wrote:
> > Clearly you're not going to make _one_ load to get fls, since having a
> > 4GB lookup array for a 32-bit fls would be "somewhat" wasteful.
>
> It ought to be basically the same as ffs because if I remember rightly
>
> ffs(x^(x-1)) == fls(x)
I don't think so. Maybe you are thinking of ffs(x) == fls(x & -x). So
you can calculate ffs with fls, but not easily the other way round.
-- Falk - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/