[Bug tree-optimization/101179] y % (x ? 16 : 4) and y % (4 << (2 * (bool)x)) produce different code

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101179

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #4) 
> Only the last one produces the best code.

So for clang, f1-f3 produces the same code but f4 is bad.
It was only fixed in clang 10.