x86 oddities:
miniblog.
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Optimising fizzbuzz with hand-written x86-64 assembly and AVX2: https://codegolf.stackexchange.com/a/236630
I guess it was only a matter of time, but it's an impressive achievement: 31GB/second!
It seems crazy to me that the definitive x86-64 resource is a PDF. It's a good reference, but having a canonical, linkable HTML resource would be really handy.
LLVM is introducing v1 to v4 of x86-64, so you can target newer chips: https://github.com/llvm/llvm-project/commit/012dd42e027e (gcc will do the same thing)