I think it says refcounting twice faster for swift on M1 compared to swift on x86.
It is possible because if you don’t have TSO(total store order), you can employ atomic operations without waiting/flushing previous items in the CPU’s store buffer
It is possible because if you don’t have TSO(total store order), you can employ atomic operations without waiting/flushing previous items in the CPU’s store buffer
Maybe they aggressively speculate around them.