[mananaysiempre]

> If you want to muddy the waters for contrarianism, [..].

No, and I don’t appreciate the accusation.

> This is clearly not what the OP was asking about.

Eh. I thought this was on topic when I wrote. On a second read I’m not sure either way. In any case, my point stands, I think: there are things happening that warm up after multiple loop iterations, as characteristic of JITs and not caches, and one potential source of those things is in fact JITish despite the fact that the translation of C++ into x86-64 has nothing to do with it—even if I’m not sure whether this is the right explanation in this particular case. The general answer to “can JITish things happen to my C++ code” is a definite yes.