Re: [RFC][PATCH] Faster generic_fls

[Alan Cox]

On Iau, 2003-05-01 at 00:41, Linus Torvalds wrote:
> On 30 Apr 2003, Alan Cox wrote:
> > 
> > It ought to be basically the same as ffs because if I remember rightly 
> > 
> > ffs(x^(x-1)) == fls(x)
> 
> So did anybody time this? ffs() we have hardware support for on x86, and 
> it's even reasonably efficient on some CPU's .. So this _should_ beat all 
> new-comers, and obviously some people already have benchmark programs 
> ready and willing..

Unfortunately on digging up my notes it seems I got ffs/fls backwards so it doesnt
help us a great deal.