cohensh writes: Google released two new non-cryptographic hash functions, CityHash64 and CityHash128, saying they are optimized for computers with "64-bit registers, instruction-level parallelism, and fast unaligned memory accesses." Additionally they say "the key advantage of our approach is that most steps contain at least two independent mathematical operations." Google claims speed increases of at least 30% going up to a factor of two.
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