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From: "pheeck at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114412] [14/15 Regression] 7% slowdown of 436.cactusADM
 on aarch64
Date: Tue, 14 May 2024 08:50:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114412

--- Comment #4 from Filip Kastl <pheeck at gcc dot gnu.org> ---
(In reply to Tamar Christina from comment #3)
> Hi Filip,
>=20
> Do you generate these runs with counters based PGO or compiler
> instrumentation?
>=20
> 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 we=
re
multiple ways to do PGO with GCC.

I think that the answer to your question is "compiler instrumentation". I j=
ust
do -fprofile-generate, run the instrumented binary and then -fprofile-use.=