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I think AsmGrid has a great overview of X86 and AArch64 instructions:

  - https://asmjit.com/asmgrid/


For x86 encodings, there’s also http://ref.x86asm.net/index.html and of course the venerable https://sandpile.org/.


Felix Cloutier's page has always been my go-to



I haven’t seen this site before. Thanks for sharing it.


wow, that's great. thanks for sharing!




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