https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94373
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- Note the cited commit simply caused more complete unrolling to happen. Too much actually which is why I reverted it. Note GCC 9.2 does not have that more unrolling so the difference must be something else in the end.
