My point about the docs isn't the day-to-day stuff, but the things that cannot be machine generated - to write a good compiler you need to know the details of how the CPU is put together underneath.
Intel will give you 800 pages on how to optimize for their current ISA (AMD will give you 45, but still)
Intel will give you 800 pages on how to optimize for their current ISA (AMD will give you 45, but still)