[Bug target/122777] [16 Regression] 5-8% slowdown of 454.calculix (PGO) and 548.exchange2_r (non-pgo) on AMD Zen{4,5} since r16-5258-g1d8e2d51e5c5cb

pheeck at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Tue Dec 23 09:56:11 GMT 2025


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122777

--- Comment #9 from Filip Kastl <pheeck at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #8)
> (In reply to Andrew Pinski from comment #6)
> > calculix for zen5 is fixed by r16-5975-gfae0c626250563 (and now better than
> > ever before).
> 
> Looks like it is broken again :(.

The new slowdown bisects to r16-6069-g9f27ac9b83af5e


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