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CRC64 perf improvements from Redis patches
* 53-73% faster on Xeon 2670 v0 @ 2.6ghz * 2-2.5x faster on Core i3 8130U @ 2.2 ghz * 1.6-2.46 bytes/cycle on i3 8130U * likely >2x faster than crcspeed on newer CPUs with more resources than a 2012-era Xeon 2670 * crc64 combine function runs in <50 nanoseconds typical with vector + cache optimizations (~8 *microseconds* without vector optimizations, ~80 *microseconds without cache, the combination is extra effective) * still single-threaded * valkey-server test crc64 --help (requires `make distclean && make SERVER_TEST=yes`)
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