> TL;DR: use std::simd if you don’t mind nightly, wide if you don’t need multiversioning, and otherwise pulp or macerator.

This matches the conclusion we reached for Chromium. We were okay with nightly, so we're using `std::simd` but trying to avoid the least stable APIs. More details: https://docs.google.com/document/d/1lh9x43gtqXFh5bP1LeYevWj0...