C# port of XXH3 (plus bonuses)
XXH3 is described here: http://fastcompression.blogspot.com/2019/03/presenting-xxh3.html
This is a poorly tested port of an experimental hash algorithm. Using it for something important would be dumb. It's also quite a bit slower than the xxHash64 implementation for large keys.
I believe I have the fastest C# xxHash32 & xxHash64 implementations around, though I have not tested that rigorously.
But I have tested it somewhat... and I win. By a lot.
| Method | ByteLength | Mean | Throughput |
|---|---|---|---|
| Zhent_xxHash32 | 15 | 12.59 ns | 1,136.5 MB/s |
| xxHashSharp_xxHash32 | 15 | 12.64 ns | 1,132.1 MB/s |
| Zhent_xxHash64 | 15 | 16.05 ns | 891.4 MB/s |
| NeoSmart_xxHash64 | 15 | 153.18 ns | 93.4 MB/s |
| yyproj_xxHash64 | 15 | 232.18 ns | 61.6 MB/s |
| HashFunctions_xxHash64 | 15 | 380.50 ns | 37.6 MB/s |
| core20_xxHash64 | 15 | 653.27 ns | 21.9 MB/s |
| Zhent_xxHash64 | 1000000 | 89,566.91 ns | 10,647.6 MB/s |
| Zhent_xxHash32 | 1000000 | 170,840.81 ns | 5,582.2 MB/s |
| yyproj_xxHash64 | 1000000 | 799,521.44 ns | 1,192.8 MB/s |
| HashFunctions_xxHash64 | 1000000 | 1,110,313.84 ns | 858.9 MB/s |
| xxHashSharp_xxHash32 | 1000000 | 1,310,830.35 ns | 727.5 MB/s |
| NeoSmart_xxHash64 | 1000000 | 1,562,210.75 ns | 610.5 MB/s |
| core20_xxHash64 | 1000000 | 6,933,568.09 ns | 137.5 MB/s |
A PRNG implementation based on xxHash32. Very fast (particularly at generating uniform float values) but it discards 10 out of 32 bits of entropy to achieve it.