ahash-cxx

A variant of Ahash written in C++.

What are the differences from Ahash?

• Almost the same for most cases.
• Use VAES for large input size on x86-64 targets
• Use SVE2-AES for large input size on aarch64 targets
• Changed aarch64 behavior to give more robust hash values.

SMHasher?

Yes, all tests are passed and the MomentChi2 result is GREAT.

Performance?

Can be much faster with VAES targets. On AMD 7773X, the throughput boosts from ~45000 MB/s (w/o VAES) to ~95000 MB/s (w/ VAES).

Notice

The hash value is not stable across different platforms and may also vary with different versions. DO NOT USE this hash function as checksums for on-disk files. AHash family are designed for in-memory hash tables.

What is missing?

• SVE2-AES can not be tested properly. There is no accessible machine with sve2-aes for me and for now.