This is almost perfectly backwards. Intel does this sort of profiling _extensively_, and it guides their decision making to a fault. Apple's advantage in this r

This is almost perfectly backwards. Intel does this sort of profiling _extensively_, and it guides their decision making to a fault. Apple's advantage in this regard is that the CPU architects can (and do) ask people writing software "if we made X faster, what could you do with it that you don't do today because it is slow?" That will never show up in a trace.