https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83202
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> --- For the other case the issue is I think that the SLP instance group size is not the number of scalar stmts but somehow set to the group-size. Changing that has quite some ripple-down effects though. -> GCC 9.