https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84481
--- Comment #12 from Martin Jambor <jamborm at gcc dot gnu.org> --- I can once again confirm the slowdown on a zen1-based machine (commit 6e1e0decc9e vs gcc 7.5) but it is not present on a zen2-based one. I wonder whether the bug should me marked as WONTFIX.