A Rust implementation of xxHash.

Build:

$ ./build.sh

You can choose the C compiler by setting --cfg gcc or --cfg clang in build.sh.

Test:

$ ./rust-xxhash --test --bench

running 25 tests
test xxhash::c::test_chunks ... ok
test xxhash::c::test ... ok
test xxhash::rust::test ... ok
test xxhash::rust::test_chunks ... ok
<snip benchmarks>

test result: ok. 4 passed; 0 failed; 0 ignored; 21 measured

Use:

let mut xxh: XXHState = XXHState::new(seed);
for chunk in v.chunks(64) {
    xxh.update(chunk);
}

let result = xxh.digest();
assert_eq!(result, expected);

Benchmark (MB/s, bigger is better, x86_64):

Test	SipHash	xxHash gcc	xxHash clang	xxHash Rust
7-byte chunks	166	277	224	285
8-byte chunks	315	479	309	479
15-byte chunks	260	445	245	444
16-byte chunks	389	788	1099	1034
32-byte chunks	448	1273	1638	1641
64-byte chunks	474	1868	2226	2303
oneshot	514	3480	3894	3855

SipHash is the Rust implementation in std::hash.

All tests are done processing a 64 kB uninitialized array. I've applied all optimizations everywhere that didn't cause the whole benchmark to get optimized out.

These numbers are just some benchmark results, nothing more.