On Sun, 7 Nov 2021, 09:08 Martin Uecker wrote: > > It would be great if somebody could take a look at > PR96159. > > It seems we do not do atomic accesses correctly > when the alignment is insufficient for a lockfree > access, but I think we should fall back to a > library call in this case (as clang does). > > This is very unfortunate as it is an important > functionality to be able to do atomic accesses > on non-atomic types and it seems there is no way > to achieve this. >
C++ solves this with std::atomic_ref<T> which has a precondition that the non-atomic object being operated on is suitably aligned. Working with arbitrary objects is not supported, the user must ensure the alignment is correct. That seems like a reasonable restriction to me.
