https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97784
--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> --- No, it is exactly the same with unsigned types :-( Use -Dlong="unsigned long" or use #define O ^ (as in my original test). I forgot about this signed thing, but it has nothing to do with it (that matters on gimple level, sure, but the problem exists in pure RTL as well).
