https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82853
--- Comment #8 from Andi Kleen <andi-gcc at firstfloor dot org> --- I'm not sure if it works with other numbers too. (need to dig through Hacker's delight & Matters Computational to see if they have anything on it) But it could be extended for other word lengths at least BTW there are some other cases, will file a bug shortly on those too.
