https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90234
Martin Jambor <jamborm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|503.bwaves_r is 6% slower |503.bwaves_r is 6% slower
|on Zen1 CPUs at -Ofast with |on Zen1/Zen2 CPUs at -Ofast
|native march/mtune than |with native march/mtune
|with generic ones |than with generic ones
--- Comment #2 from Martin Jambor <jamborm at gcc dot gnu.org> ---
I spoke too soon, I can see this in May gcc 10.1 data on zen1 machine and also
in current master (6e1e0decc9e) on a zen-2 machine, still about 6% in both
cases.
(Gcc9 does not have this problem on zen2 but does on zen1 so it looks a bit
fragile).
