https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114932
--- Comment #24 from Tamar Christina <tnfchris at gcc dot gnu.org> --- Hi, Yeah vectorization was one of the reasons for the slowdown. Do note however it's not entirely safe to backport that patch, as it exposes another bug which has a large fix. At least the top two commits here are needed https://github.com/gcc-mirror/gcc/commits/master/gcc/cfgexpand.cc probably the top three. So backporting is really unlikely
