https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89626
--- Comment #9 from Bill Schmidt <wschmidt at gcc dot gnu.org> --- vector __int128 is equivalent to vector signed __int128, and only is defined for the ELFv2 ABI. Technically ELFv2 can be used anywhere, but in practice it is little-endian only. LE systems require a minimum of POWER8.
