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sorted-rs's Introduction

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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

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