Re: [RFC] div64_64 support

[Roland Kuhn]

Hi Andi!

On 6 Mar 2007, at 15:45, Andi Kleen wrote:

> > <rant>
> > Let me see... You throw code like that and expect someone to actually
> > understand it in one year, and be able to correct a bug ?
>
> To be honest I don't expect any bugs in this function.
>
> > </rant>
> >
> > Please add something, an URL or even better a nice explanation,  
> > per favor...
>
> It's straight out of Hacker's delight which is referenced in the  
> commit
> log.
And it's pretty neat, too. Hint: (y+1)**3 = y**3 + 3*y**2 + 3*y + 1.  
The algorithm is exactly the same as for calculating the cubic root  
on paper, digit by digit. I found that algo in the school notebook of  
my grandpa (late 1920ies), a pity that it's not taught anymore...  
pocket calculators _do_ have downsides ;-)

Ciao,
                    Roland

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