[Bug tree-optimization/114121] wrong code with _BitInt() arithmetics at -O2

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114121

--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #11)
> Shall I try to construct a non-bitint testcase for this?

That would be nice, more coverage is always good.