https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63599
--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> --- ifcvt making a transformation that doesn't help vectorization and ends up pessimizing the code... not really the first time this happens. I believe Jakub had a big patch for that, but it never got in. Maybe vectors could be special-cased if we never vectorize them anyway.
