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Amazing, thanks!

Answering my own question a little, on further exploration the Intel optimisation actually has a good chapter on avx512: https://www.intel.com/content/www/us/en/content-details/6714...

there are only a handful of instructions that do interesting things beyond parallel versions of basic arithmetic and bitwise operations. https://branchfree.org/2019/05/29/why-ice-lake-is-important-... provides a good overview of them.