Re: [PATCH v9] pgo: add clang's Profile Guided Optimization infrastructure
From: Peter Zijlstra
Date: Mon Jun 14 2021 - 11:36:26 EST
On Mon, Jun 14, 2021 at 08:26:01AM -0700, Kees Cook wrote:
> So, AFAICT, the original blocking issue ("PGO does not respect noinstr")
> is not actually an issue (noinstr contains notrace, which IS respected
> by PGO[2]), I think this is fine to move forward.
It is *NOT*: https://godbolt.org/z/9c7xdvGd9
Look at how both compilers generate instrumentation in the no_instr()
function.