[goodguyamerikan]

Also, with the kind of smug tone op has posted his comment, I'm reasonably sure he doesn't understand that basic techniques fir x86 optimization have actually remain largely unchanged and what worked then also works reasonably well now, despite compiler improvements

[adhesive_wombat]

Also you don't get good at assembly optimisation without understanding things like cache coherency and register allocations. New CPUs don't suddenly invalidate that ability to reason about what the problem might be and what might help (and what might not). Crucially, you already know how to adjust your existing skills to apply to new things.