mapleFU commented on issue #34536:
URL: https://github.com/apache/arrow/issues/34536#issuecomment-1474907213
On my PC (Ryzen 3800X, avx2 enabled):
Before:
```
BM_DeltaBitPackingDecode_Int64_Fixed/1024 1600 ns 1600 ns
491568 bytes_per_second=4.76804G/s items_per_second=639.955M/s
BM_DeltaBitPackingDecode_Int64_Fixed/4096 5246 ns 5246 ns
127230 bytes_per_second=5.81734G/s items_per_second=780.79M/s
BM_DeltaBitPackingDecode_Int64_Fixed/32768 40950 ns 40950 ns
17193 bytes_per_second=5.96191G/s items_per_second=800.194M/s
BM_DeltaBitPackingDecode_Int64_Fixed/65536 86954 ns 86954 ns
7647 bytes_per_second=5.61541G/s items_per_second=753.688M/s
BM_DeltaBitPackingDecode_Int64_Narrow/1024 1397 ns 1397 ns
533580 bytes_per_second=5.4631G/s items_per_second=733.244M/s
BM_DeltaBitPackingDecode_Int64_Narrow/4096 4861 ns 4861 ns
130775 bytes_per_second=6.27746G/s items_per_second=842.547M/s
BM_DeltaBitPackingDecode_Int64_Narrow/32768 38218 ns 38218 ns
18204 bytes_per_second=6.38816G/s items_per_second=857.405M/s
BM_DeltaBitPackingDecode_Int64_Narrow/65536 81387 ns 81378 ns
9067 bytes_per_second=6.00015G/s items_per_second=805.326M/s
BM_DeltaBitPackingDecode_Int64_Wide/1024 1667 ns 1667 ns
415468 bytes_per_second=4.57783G/s items_per_second=614.426M/s
BM_DeltaBitPackingDecode_Int64_Wide/4096 6611 ns 6611 ns
106650 bytes_per_second=4.61636G/s items_per_second=619.598M/s
BM_DeltaBitPackingDecode_Int64_Wide/32768 50174 ns 50175 ns
13207 bytes_per_second=4.86579G/s items_per_second=653.076M/s
BM_DeltaBitPackingDecode_Int64_Wide/65536 95179 ns 95177 ns
7163 bytes_per_second=5.13025G/s items_per_second=688.57M/s
```
After
```
BM_DeltaBitPackingDecode_Int64_Fixed/1024 1263 ns 1263 ns
566989 bytes_per_second=6.04143G/s items_per_second=810.867M/s
BM_DeltaBitPackingDecode_Int64_Fixed/4096 4947 ns 4947 ns
147214 bytes_per_second=6.16904G/s items_per_second=827.995M/s
BM_DeltaBitPackingDecode_Int64_Fixed/32768 34564 ns 34563 ns
18313 bytes_per_second=7.06362G/s items_per_second=948.063M/s
BM_DeltaBitPackingDecode_Int64_Fixed/65536 71620 ns 71620 ns
10407 bytes_per_second=6.8177G/s items_per_second=915.057M/s
BM_DeltaBitPackingDecode_Int64_Narrow/1024 1126 ns 1126 ns
668056 bytes_per_second=6.77524G/s items_per_second=909.358M/s
BM_DeltaBitPackingDecode_Int64_Narrow/4096 3870 ns 3870 ns
178266 bytes_per_second=7.8859G/s items_per_second=1058.43M/s
BM_DeltaBitPackingDecode_Int64_Narrow/32768 30225 ns 30225 ns
22369 bytes_per_second=8.07734G/s items_per_second=1084.12M/s
BM_DeltaBitPackingDecode_Int64_Narrow/65536 62196 ns 62196 ns
11439 bytes_per_second=7.8507G/s items_per_second=1053.7M/s
BM_DeltaBitPackingDecode_Int64_Wide/1024 1138 ns 1138 ns
643474 bytes_per_second=6.70583G/s items_per_second=900.041M/s
BM_DeltaBitPackingDecode_Int64_Wide/4096 4244 ns 4244 ns
168230 bytes_per_second=7.19138G/s items_per_second=965.21M/s
BM_DeltaBitPackingDecode_Int64_Wide/32768 33419 ns 33420 ns
21727 bytes_per_second=7.30532G/s items_per_second=980.504M/s
BM_DeltaBitPackingDecode_Int64_Wide/65536 75581 ns 75581 ns
10711 bytes_per_second=6.46034G/s items_per_second=867.093M/s
```
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