If your box has avx512, this paper has a neat vectorized double precision reciprocal: http://www.ecs.umass.edu/arith-2018/pdf/arith25_18.pdf http://www.ecs.umas

If your box has avx512, this paper has a neat vectorized double precision reciprocal: http://www.ecs.umass.edu/arith-2018/pdf/arith25_18.pdf http://www.ecs.umass.edu/arith-2018/pdf/arith25_18.pdf I’ve not tried it yet but I like all the new math instructions.