Function spp_mix_64

libCacheSim/dataStructure/sparsepp/spp_utils.h:189–199

More thorough scrambling as described in https://gist.github.com/badboy/6267743 ----------------------------------------

// https://gist.github.com/badboy/6267743
// ----------------------------------------
inline size_t spp_mix_64(uint64_t a)
{
    a = (~a) + (a << 21); // a = (a << 21) - a - 1;
    a = a ^ (a >> 24);
    a = (a + (a << 3)) + (a << 8); // a * 265
    a = a ^ (a >> 14);
    a = (a + (a << 2)) + (a << 4); // a * 21
    a = a ^ (a >> 28);
    a = a + (a << 31);
    return static_cast<size_t>(a);
}

template<class ArgumentType, class ResultType>
struct spp_unary_function