[Bug libstdc++/63400] [C++11]precision of std::chrono::high_resolution_clock

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63400

--- Comment #15 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #14)
> Or maybe the testcase makes invalid assumptions and isn't really measuring
> what it thinks it's measuring?

e.g. maybe clock_getres says 100ns even though the clocks aren't really that
precise.