mapleFU commented on issue #40845:
URL: https://github.com/apache/arrow/issues/40845#issuecomment-2041473248
```
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
6392 ns 6397 ns 110245 bytes_per_second=2.35721Gi/s
items_per_second=1.26552G/s
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
9655 ns 9660 ns 73389 bytes_per_second=1.56112Gi/s
items_per_second=838.118M/s
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1024
815 ns 816 ns 842744 bytes_per_second=18.4773Gi/s
items_per_second=9.91994G/s
ReadLevels_Rle/MaxLevel:1/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
6261 ns 6265 ns 111711 bytes_per_second=2.40713Gi/s
items_per_second=1.29232G/s
ReadLevels_Rle/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
5864 ns 5868 ns 121156 bytes_per_second=2.56974Gi/s
items_per_second=1.37962G/s
ReadLevels_Rle/MaxLevel:3/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
5834 ns 5838 ns 121253 bytes_per_second=2.58328Gi/s
items_per_second=1.38689G/s
ReadLevels_Rle/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
10310 ns 10314 ns 67700 bytes_per_second=1.46203Gi/s
items_per_second=784.92M/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
5650 ns 5654 ns 122543 bytes_per_second=2.66698Gi/s
items_per_second=1.43182G/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
5708 ns 5712 ns 123613 bytes_per_second=2.64013Gi/s
items_per_second=1.41741G/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1024
5673 ns 5677 ns 122896 bytes_per_second=2.65629Gi/s
items_per_second=1.42608G/s
ReadLevels_BitPack/MaxLevel:1/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
5572 ns 5576 ns 125720 bytes_per_second=2.70428Gi/s
items_per_second=1.45185G/s
ReadLevels_BitPack/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:1
5612 ns 5615 ns 128266 bytes_per_second=2.68549Gi/s
items_per_second=1.44176G/s
ReadLevels_BitPack/MaxLevel:3/NumLevels:8096/BatchSize:2048/LevelRepeatCount:1
5511 ns 5516 ns 125777 bytes_per_second=2.73406Gi/s
items_per_second=1.46784G/s
ReadLevels_BitPack/MaxLevel:3/NumLevels:8096/BatchSize:1024/LevelRepeatCount:7
5626 ns 5630 ns 127101 bytes_per_second=2.67841Gi/s
items_per_second=1.43796G/s
```
avx2 doesn't have `__m256i _mm256_sllv_epi16 (__m256i a, __m256i count)`,
it's introduced in avx512, so it's even slower...
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