[Bug target/123603] [16/17 Regression] 13% slowdown of exchange2_r on Zen4 since r16-6767-g948d33f490a6b0

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123603

--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
The exchange2 regressions seem to be mostly (some 2-3% seem left) resolved, the
other issues should get separate bugreports, it makes it unwieldly to track
this all in one bug, even if caused by the same change.