https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108240
--- Comment #12 from Segher Boessenkool <segher at gcc dot gnu.org> --- We really really REALLY should neuter -mmodulo. It is counter-productive to have command-line flags for separate instructions at all (as opposed to facilities), and it is downright destructive to have sneaky ways to enable most (but not all!) of what -mcpu= does via other options.