lib/x86/crc32: add VPCLMULQDQ implementations of CRC-32 #341
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This improves CRC-32 performance on some of the latest x86 CPUs. Three implementations are added: VPCLMULQDQ/AVX2 and VPCLMULQDQ/AVX512VL which use 256-bit vectors, and VPCLMULQDQ/AVX512F/AVX512VL which uses 512-bit vectors. To reduce downclocking effects, the implementation with 512-bit vectors isn't used on Intel CPUs 10th generation and older.
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This improves CRC-32 performance on some of the latest x86 CPUs. Three implementations are added: VPCLMULQDQ/AVX2 and VPCLMULQDQ/AVX512VL which use 256-bit vectors, and VPCLMULQDQ/AVX512F/AVX512VL which uses 512-bit vectors. To reduce downclocking effects, the implementation with 512-bit vectors isn't used on Intel CPUs 10th generation and older.