This ("TSO") is actually an ARM standard however its only very latest ARM (v8.4-v8.7) and not many other CPU implementation currently. AWS Graviton 3 and maybe very latest phone SoCs if I understand correctly.

https://news.ycombinator.com/item?id=31664688 https://twitter.com/marcan42/status/1534053625110351872 https://twitter.com/never_released/status/153412764108259328...