[Bug c/117266] RFE: builtins for N*N -> 2N multiplication and 2N/N -> N div/mod

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117266

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>(b) is guaranteed to be unavailable for the largest integer type supported, 
>which is machine- and compiler-dependent.


Well if all targets get their act together with respect to the ABI, then
_BitInt will be supported and there is a guarantee.

So yes _BitInt solves this.