[Bug target/120957] [16 Regression] 6-9% slowdown of 503.bwaves_r on Zen{2,3} since r16-1647-gc06979ff957485

[pheeck at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120957

--- Comment #3 from Filip Kastl <pheeck at gcc dot gnu.org> ---
I've bisected this on Zen2.  It is possible that this is actually two different
slowdowns and only the Zen2 slowdown is caused by r16-1647.  I'll bisect on
Zen3.