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MDEV-33817: AVX512BW and VPCLMULQDQ based CRC-32
This is based on https://github.com/intel/intel-ipsec-mb/ and has been tested both on x86 and x86-64, with code that was generated by several versions of GCC and clang. GCC 11 or clang 8 or later should be able to compile this, and so should recent versions of MSVC. Thanks to Intel Corporation for providing access to hardware and for answering my questions regarding the code. crc32_avx512(): Compute a reverse polynomial CRC-32 using precomputed tables and carry-less product, for up to 256 bytes of unaligned input per loop iteration.
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