[![build](https://github.com/kwanCCC/sorted-rs/actions/workflows/rust.yml/badge.svg)](https://github.com/kwanCCC/sorted-rs/actions/workflows/rust.yml) ## Another algorithm base on SIMD which use to check slice is sorted or not It both support `SSE2` and `AVX2` and much faster than regular implementations. ### generic ``` [ a, b, c, d .... x, y, z] compare a and b, compare b and c, compare c and d ``` ### SIMD ``` [ a, b, c, d .... x, y, z] load [a, b, c, d] into chunk0, load [b, c, d, d] into chunk1, compare chunk0 and chunk1, load [d, e, f, g] into chunk0, load [e, f, g, g] into chunk1, compare chunk0 and chunk1 again ``` ### Benchmark on AMD | size | generic | sse | avx2 | |-------|-----------|-----------|-----------| | 4 | 7.4974 ns | 8.3876 ns | 1.1984 ns | | 32 | 65.302 ns | 40.632 ns | 16.469 ns | | 64 | 121.92 ns | 71.861 ns | 30.551 ns | | 128 | 237.09 ns | 144.08 ns | 66.191 ns | | 256 | 466.77 ns | 273.48 ns | 99.640 ns | | 1024 | 1.8486 µs | 1.0634 µs | 410.66 ns | | 4096 | 7.3648 µs | 4.2080 µs | 6.1038 µs | | 16384 | 29.458 µs | 16.702 µs | 6.1038 µs | | 65536 | 117.82 µs | 66.982 µs | 24.355 µs |