https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126935
--- Comment #3 from ktkachov at gcc dot gnu.org --- (In reply to Drea Pinski from comment #2) > Actually I think the better check is if the processor has SVE and SVE2. > Even though SVE2 should be enough here; it seems like some VMs advertise > SVE2 but not SVE support (which in itself odd but that ever). Oof, SVE2 but not SVE is a nonsense configuration. Anyway, for the libcpp fast-path I've added I think we can make the configure check also execute the SVE2 instructions required, not just test their HWCAPs. That would sidestep the dodgy VM advertising
