[Bug c++/83710] Unsigned with Signed multiplication followed by right shift

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83710

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For imull discussion see
https://stackoverflow.com/questions/42587607/why-is-imul-used-for-multiplying-unsigned-numbers
.