The C++ standard's definition of a datarace only applies to ordinary memory access and rules those cases UB. But if you port such code to use relaxed load/store

The C++ standard's definition of a datarace only applies to ordinary memory access and rules those cases UB. But if you port such code to use relaxed load/store operations it's just as racey, but no longer UB. I'd consider still consider those cases data races, even though they don't meet the C++ standard's definition of them.