Re: Good hash for pointers

 uint64_t MichaelsHash( uint64_t key )
{
     __m128i xkey = _mm_set_epi64x( key, 42 );
     using bar_t = pair<uint64_t, uint64_t>;
     static bar_t const bars[8] =
     {
         { 0xBB09BBCC90B24BF2, 0x825C622FF2792A01 },
         { 0x94F0535CB06D4060, 0x939C756246DBFD1D },
         { 0x5B835E01A7E14CA1, 0xAC2BDAFC023CDD06 },
         { 0xE0B6A4735B774AEC, 0x9CAFB43E7DDE494C },
     };
     for( bar_t const &bar : bars )
         xkey = _mm_aesenc_si128( xkey, _mm_set_epi64x( bar.second, bar.first ) );
     return xkey.m128i_u64[0];
}
 Now the code is about six times faster and I get a eight times
speedup over single-threaded processing with the same code. Of
course the results are still the same.