That’s exactly what happened:

https://xcancel.com/mitchellh/status/2079672171321081908#m

You know, it's always funny to read takes like "A broken compiler forcing you to write explicit SIMD instead of trusting auto-vectorization and coming out 20-30% faster is the best argument I've seen for reading your own generated assembly occasionally instead of assuming the compiler has you covered" because you can quite easily imagine an alternative one like "A broken compiler revealing that the auto-vectorization actually already accounts for 50% of total speed up of O3, and manual reimplementation and code restructuring provided only additional 20% in some scenarios is the best argument I've seen for almost never bothering with hand-crafting assembly anymore".