rustdesk/vendor/simd-adler32

simd-adler32

A SIMD-accelerated Adler-32 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

[dependencies]
simd-adler32 = "*"

example.rs

use simd_adler32::Adler32;

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

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

Support

CPU Features

impl	arch	feature
✅	x86, x86_64	avx512
✅	x86, x86_64	avx2
✅	x86, x86_64	ssse3
✅	x86, x86_64	sse2
🚧	arm, aarch64	neon
✅	wasm32	simd128

MSRV 1.36.0**

Minimum supported rust version is tested before a new version is published. [**] Feature const-generics needs to disabled to build on rustc versions <1.51 which can be done by updating your dependency definition to the following.

Cargo.toml

[dependencies]
simd-adler32 = { version "*", default-features = false, features = ["std"] }

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/wuffs	3843 ns	2.63 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/wuffs	34733 ns	2.6814 GiB/s*
100k/adler32	48.488 us	1.9207 GiB/s
100k/adler	178.36 us	534.69 MiB/s

* wuffs ran using mingw64/gcc, ran with wuffs bench -ccompilers=gcc -reps=1 -iterscale=300 std/adler32.

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

This crate contains a significant amount of unsafe code due to the requirement of unsafe for simd intrinsics. Fuzzing is done on release and debug builds prior to publishing via afl. Fuzzy tests can be found under fuzz the directory.

Resources

• LICENSE - MIT
• CHANGELOG

Credits

Thank you to the contributors of the following projects.

• adler
• adler32
• crc32fast
• wuffs
• chromium
• zlib

Contributing

Feel free to submit a issue or pull request. 😄