https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114412

--- Comment #5 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
(In reply to Filip Kastl from comment #4)
> (In reply to Tamar Christina from comment #3)
> > Hi Filip,
> > 
> > Do you generate these runs with counters based PGO or compiler
> > instrumentation?
> > 
> > Just so I know before I start trying to reproduce them.
> 
> Hi Tamar,
> 
> By counters you mean some sort of hardware counters? I didn't know there
> were multiple ways to do PGO with GCC.
> 
> I think that the answer to your question is "compiler instrumentation". I
> just do -fprofile-generate, run the instrumented binary and then
> -fprofile-use.

Yeah, with some elbow grease the perf record method works too, but it's not
very accurate on Armv8.

I'll try to reproduce and bisect these over the weekend!

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