https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112548

--- Comment #5 from Filip Kastl <pheeck at gcc dot gnu.org> ---
(In reply to Robin Dapp from comment #4)
> Judging by the graph it looks like it was slow before, then got faster and
> now slower again.  Is there some more info on why it got faster in the first
> place?  Did the patch reverse something or is it rather a secondary effect? 
> I don't have a zen4 handy to check.

Don't know if this helps but I bisected the speedup to
g:b583a2940af90d03f535648fef111cb158933f7d.

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