This package implements a binding to the CityHash family of hashing functions (implemented in C++.) See http://code.google.com/p/cityhash/ for more information. This package has optional SSE4.2 support. If you build it with the -fsse42 flag, the 128-bit hashing functions will use an SSE-optimized implementation (which takes advantage of the crc32 instruction present on recent Intel/AMD machines.) The 64-bit hashing functions are unaffected.