[Rd] compiler flags for performance

[lejeczek]

hi guys,

I'd like to ask, and I believe this place here should be best as who can
know better, if building R with different compilers and opt flags is
something worth investing time into?

Or maybe this a subject that somebody has already investigated. If yes
what then are the conclusion?

Reason I ask is such that, on Centos 7.6 with different compilers from
stock repo but also from so called software collections, do not
render(with flags for performance) an R binaries which would perform any
better, according to R-benchmark-25 at least, then "vanilla" packages
shipped from distro.

And that makes me curious - is it because R is such a case which is
prone to any compiler performance optimizations?

Maybe there is more structured and organized way to conduct such
different-compilers-optimizations benchmarks/test?

What do devel can say and advise with regards to compile-for-performance
subject?

many thanks, L.