My question: What stops Intel or AMD from providing an opt-in weaker memory model? Probably for the same reason Intel/AMD doesn't get rid of the rest of the cr

My question: What stops Intel or AMD from providing an opt-in weaker memory model? Probably for the same reason Intel/AMD doesn't get rid of the rest of the cruft in x86-64, i.e. backwards compatibility. Additionally, there would be issues with Intel/AMD leveraging an optional weak memory model in their chips without compromising the performance of legacy TSO applications. They are probably better off making x86-64 perform best under TSO.