> <rant>
quoted text
> 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.

quoted text
> </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.

-Andi
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