https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91940
--- Comment #10 from Jorn Wolfgang Rennecke <amylaar at gcc dot gnu.org> --- Even if you add support for V2HI bswap, it won't help vectorization without support for V4QI vectors and permutations, because vectorizable_bswap won't recognize the bswap capability of the target any other way.
