Have been really happy with Fearless simd, I used it to write [memchr-n][1], which searches for instances of an arbitrary set of bytes, with simd, which actually tends to [outperform][2] the rust memchr crate, even for sets of 1-3 bytes (what's supported by memchr)
Kinda:
Early last year, I had done a little work with direct intrinsics first, then investigated std::simd, but ran into the issue of swizzle_dyn needing to re-compile std. It was actually when I ran across https://shnatsel.github.io/improving-std-simd-swizzle-dyn/ that got me back into it.
[1]: https://github.com/Dr-Emann/memchr_n#performance [2]: https://github.com/BurntSushi/memchr/pull/241