[Bug middle-end/116508] [15 Regression] `popcount(char) == 1` or char no longer expands to using `(arg ^ (arg - 1)) > arg - 1` trick after r15-2946-gfcc3af99498804

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116508

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #8)
> So what's the state here?

There is a cost model issue with the `char` case. I am not sure if this shows
up in any code or not; it was more I found it while improving the popcount case
in general. That being said I would defer it to GCC 16 as the changes to the
cost inside the aarch64 backend need some TLC and is not a small change.