Speeding up evaluation of small exponential-like series

Yeah, I was secretly hoping someone could point me to a simple way to get this to SIMD – I had also seen the claim of a SIMD exp in SIMD.jl but have no experience writing such code so wanted to first see if someone knew an easy way to get it to work.

Also, several of the main users of the code are on M-series Macs, and I don’t have a good feeling for if SIMD tooling does much there currently. Does anyone know if libraries like SIMD.jl give any benefit on the ARM chips?