Re: [PATCH v9] pgo: add clang's Profile Guided Optimization infrastructure

[Peter Zijlstra]

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.