https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105950
--- Comment #29 from John Kanapes <jkanapes at yahoo dot com> --- Thx for trying it so fast. I assume you have downloaded it, and no longer need the link:) I have no problem with the -mavx2 option. I have gcc 9.4.0, though. Have you tried it with it?