[Bug middle-end/86640] [8/9 regression] ICE in combine

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86640

--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
The RTL before combine looks very wrong, already, fwiw; it's wrong at
expand already (it makes the func return 255).