Last time this was asked I was working on this

https://github.com/fmstephe/simd_explorer

A little TUI app for interactively running different SIMD instructions and seeing the outputs.

Since then I have completed the tool for AVX/2. At this stage that's as far as I intend to go.

It's potentially valuable as an interactive quick reference guide for SIMD instructions.

It works on Windows, Linux and with the right environment variables it will successfully pretend to be AMD64 running on an Apple M chip.

Arm NEON instructions are not supported at all, currently Go's assembler does not include these instructions directly, so I didn't attempt to build for them. Maybe one day.

Next up, learn Zig - be happy.