An Encoding Diagram Attempt
I tried to generate a diagram of the x86-64 legacy encoding based on what I know so far.
Source: kenanb.com
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Fun with Timers and cpuid
CPU fun Who really designed this processor? Introduction This time around I’m going to look at high-resolution timers and a few oddities in the way the x86_64 emulation on the M1 presents itself, that lead to some potential “gotchas”. I’ve created a small program to demonstrate the issues I discuss here, which you can download to run yourself. It’s (e.g. src/stats-timing.cc which is itself used by the micro-benchmarks in the LOMP Why Worry About Timers? For micro-benchmarks it is useful to have high-resolution, low-overhead timers, ideally ones which we can access in a single ins...
Source: substack.com