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Add hand vectorised avx512 binary operators #961

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Description

This pull requests adds avx512 vectorisation for binary operators

List of changes:

  • AVX512 vectorisations
  • Small optimisations for avx2 and sse cases

Added dependencies: none

How to test

Please run this on one of your servers with avx512 support to see if you actually get some performance benefits from it

Checklist

  • I have tested the code manually
  • I have run regression tests
  • I have read and followed CONTRIBUTING.md
  • I have updated CHANGELOG.md

I have attached the output of the failed regression tests: regtest.tar.gz

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