[Bug libstdc++/46447] std::atomic_flag slower than std::atomic_uchar

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46447

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
With trunk on powerpc64le the results are consistent for the different types,
but the clear operations are faster:

atomic_flag.cc                  atomic_flag::test_and_set()      358r
atomic_flag.cc                  atomic_flag::clear()             159r
atomic_flag.cc                  atomic_uchar::operator|=(1)      357r
atomic_flag.cc                  atomic_flag::operator=(0)        159r
atomic_flag.cc                  atomic_int::operator|=(1)        357r
atomic_flag.cc                  atomic_int::operator=(0)         158r