Hmm, yes, there are only 2 or 3 instructions that can execute concurrently - but your observation made me realise I can eke out another by masking is_ascii more

Hmm, yes, there are only 2 or 3 instructions that can execute concurrently - but your observation made me realise I can eke out another by masking is_ascii more thoroughly. Thanks! Bulk throughput isn’t really my aim, it’s just a convenient way to get numbers big enough to be easily measurable :-)