simd-adler32

A SIMD-accelerated Adler-32 rolling hash algorithm implementation.

Features

• No dependencies
• Support no_std (with default-features = false)
• Runtime CPU feature detection (when std enabled)
• Blazing fast performance on as many targets as possible (currently only x86 and x86_64)
• Default to scalar implementation when simd not available

Quick start

Cargo.toml

toml [dependencies] simd-adler32 = "*"

example.rs

```rust use simd_adler32::Adler32;

let mut adler = Adler32::new(); adler.update(b"rust is pretty cool, man"); let hash = adler.finalize();

println!("{}", hash); // 1921255656 ```

Performance

Benchmarks listed display number of randomly generated bytes (10k / 100k) and library name. Benchmarks sources can be found under the bench directory. Crates used for comparison are adler and adler32.

Windows 10 Pro - Intel i5-8300H @ 2.30GHz

| name | avg. time | avg. thrpt | | ----------------------- | --------------- | ------------------ | | 10k/simd-adler32 | 212.61 ns | 43.805 GiB/s | | 10k/adler32 | 4.8084 us | 1.9369 GiB/s | | 10k/adler | 17.979 us | 530.43 MiB/s | | ----------------------- | --------------- | ------------------ | | 100k/simd-adler32 | 2.7951 us | 33.320 GiB/s | | 100k/adler32 | 48.488 us | 1.9207 GiB/s | | 100k/adler | 178.36 us | 534.69 MiB/s |

MacBookPro16,1 - Intel i9-9880H CPU @ 2.30GHz

| name | avg. time | avg. thrpt | | ----------------------- | --------------- | ------------------ | | 10k/simd-adler32 | 200.37 ns | 46.480 GiB/s | | 10k/adler32 | 4.1516 us | 2.2433 GiB/s | | 10k/adler | 10.220 us | 933.15 MiB/s | | ----------------------- | --------------- | ------------------ | | 100k/simd-adler32 | 2.3282 us | 40.003 GiB/s | | 100k/adler32 | 41.130 us | 2.2643 GiB/s | | 100k/adler | 83.776 us | 534.69 MiB/s |

Safety

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Support

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Contributing

Feel free to submit a issue or pull request. :smile: