fletcher-simd

A SIMD implementation of the [Fletcher's checksum] algorithm.

Note: This implementation uses a modulus of 2^k where k is the checksum block size in bits, as this is fast with wrapping math. Other implementations may use 2^k - 1.

Features

• Uses std::simd, which currently requires nightly.
• Supports all architectures supported by std::simd.
• Both run-time and compile-time detection available via the [multiversion] crate.
• Scalar fallback.

Example

```rust use byteorder::{ByteOrder, LittleEndian}; use fletcher_simd::Fletcher128;

fn main() { const DATA: &str = "abcdefgh"; let mut fletcher = Fletcher128::new();

// Read bytes in little endian. Endianness matters!
fletcher.update_with_iter(
    DATA.as_bytes()
        .chunks(8)
        .map(|chunk| LittleEndian::read_u64(chunk)),
);

assert_eq!(fletcher.value(), 0x68676665646362616867666564636261);

} ```