> The second area is memory consistency guarantees. x64 has relatively strong guarantees, allowing simpler assembly code but at the cost of more complex memory

> The second area is memory consistency guarantees. x64 has relatively strong guarantees, allowing simpler assembly code but at the cost of more complex memory subsystem between cores. A64 has much weaker ordering guarantees, which saves on hardware complexity, but required the programmer (and/or compiler) to insert memory fences whenever stricter ordering is required. I'm not a fan at all of weak memory models. Especially when it results (is it caused by that? probably?) in atomics being crazy slow compared to those of state of the art x86. Especially since multicore is crucially important and will continue to become even more, and there is no SW solution to a HW providing slow atomics.