crc64fast

SIMD-accelerated CRC-64-ECMA computation (similar to crc32fast).

Usage

```rust use crc64fast::Digest;

let mut c = Digest::new(); c.write(b"hello "); c.write(b"world!"); let checksum = c.sum64(); asserteq!(checksum, 0x8483c0fa32607d61); ```

Performance

crc64fast provides two fast implementations, and the most performance one will be chosen based on CPU feature at runtime.

• a fast, platform-agnostic table-based implementation, processing 16 bytes at a time.
• an SSE/PCLMULQDQ-based implementation on modern x86/x86_64 processors.

| Algorithm | Throughput (x86_64) | |:----------------------|--------------------:| | [crc 1.8.1] | 0.5 GiB/s | | crc64fast (table) | 2.3 GiB/s | | crc64fast (pclmulqdq) | 28.2 GiB/s |

TODO

This crate is mainly intended for use in TiKV only. Features beyond AArch64 are unlikely to be implemented.

• [ ] AArch64 support based on PMULL
• [ ] no_std support
• [ ] Fuzz test
• [ ] Custom polynomial

License

crc64fast is dual-licensed under

• Apache 2.0 license ([LICENSE-Apache] or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license ([LICENSE-MIT] or https://opensource.org/licenses/MIT)