[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

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
As far getting the bitsize for the type, i think it was originally part of
bitint support but removed. Maybe it will be added back.