Re: [PATCH] lib/int_sqrt.c: Optimize square root function

[Davidlohr Bueso]

On Mon, 2015-02-02 at 20:41 -0800, Davidlohr Bueso wrote:
> On Mon, 2015-02-02 at 11:13 -0800, Linus Torvalds wrote:
> > IOW, instead of
> > 
> >   m = 1UL << (BITS_PER_LONG - 2);
> > 
> > perhaps something like
> > 
> >    m = 1UL << (BITS_PER_LONG/2- 2);
> >    if (m < x)
> >        m <<= BITS_PER_LONG/2;

Assuming small values mostly, we could also try more aggressive
estimators for BITS_PER_LONG == 64. But then again, it probably doesn't
matter.

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