ARM has a weakly-ordered memory model, while x86 is much more strongly-ordered. See https://en.wikipedia.org/wiki/Memory_ordering#Runtime_memory_ordering https:

ARM has a weakly-ordered memory model, while x86 is much more strongly-ordered. See https://en.wikipedia.org/wiki/Memory_ordering#Runtime_memory_ordering https://en.wikipedia.org/wiki/Memory_ordering#Runtime_memory.... So e.g., on x86 if you store to A then store to B, then if another core sees the store to B it is guaranteed to see the store to A as well. This guarantee does not exist on ARM.