Sujet : Re: Good hash for pointers
De : malcolm.arthur.mclean (at) *nospam* gmail.com (Malcolm McLean)
Groupes : comp.lang.cDate : 10. Jun 2024, 01:34:21
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <v45hmd$3t9dq$1@dont-email.me>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13 14
User-Agent : Mozilla Thunderbird
On 09/06/2024 12:35, Bonita Montero wrote:
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.
Thank you.
I have your permission to drop that in?
-- Check out my hobby project.http://malcolmmclean.github.io/babyxrc
Re: Good hash for pointers
Re: Good hash for pointers