mapleFU commented on PR #40335:
URL: https://github.com/apache/arrow/pull/40335#issuecomment-1985044116
My AMD 3800X Scalar code benchmark:
```
BM_ByteStreamSplitDecode_Float_Scalar/1024 1321 ns 1321 ns
655835 bytes_per_second=2.88745Gi/s
BM_ByteStreamSplitDecode_Float_Scalar/4096 4252 ns 4252 ns
163571 bytes_per_second=3.58879Gi/s
BM_ByteStreamSplitDecode_Float_Scalar/32768 40957 ns 40957 ns
16015 bytes_per_second=2.98046Gi/s
BM_ByteStreamSplitDecode_Float_Scalar/65536 92735 ns 92734 ns
8404 bytes_per_second=2.6327Gi/s
BM_ByteStreamSplitDecode_Double_Scalar/1024 3991 ns 3991 ns
185298 bytes_per_second=1.9117Gi/s
BM_ByteStreamSplitDecode_Double_Scalar/4096 11446 ns 11446 ns
59298 bytes_per_second=2.66621Gi/s
BM_ByteStreamSplitDecode_Double_Scalar/32768 85616 ns 85615 ns
7896 bytes_per_second=2.8516Gi/s
BM_ByteStreamSplitDecode_Double_Scalar/65536 147690 ns 147689 ns
4269 bytes_per_second=3.30614Gi/s
BM_ByteStreamSplitEncode_Float_Scalar/1024 889 ns 889 ns
856381 bytes_per_second=4.29155Gi/s
BM_ByteStreamSplitEncode_Float_Scalar/4096 3292 ns 3292 ns
203271 bytes_per_second=4.6351Gi/s
BM_ByteStreamSplitEncode_Float_Scalar/32768 26056 ns 26055 ns
27125 bytes_per_second=4.68507Gi/s
BM_ByteStreamSplitEncode_Float_Scalar/65536 52304 ns 52304 ns
13491 bytes_per_second=4.66769Gi/s
BM_ByteStreamSplitEncode_Double_Scalar/1024 2216 ns 2216 ns
354656 bytes_per_second=3.44257Gi/s
BM_ByteStreamSplitEncode_Double_Scalar/4096 7198 ns 7198 ns
91613 bytes_per_second=4.24001Gi/s
BM_ByteStreamSplitEncode_Double_Scalar/32768 61507 ns 61507 ns
13072 bytes_per_second=3.96931Gi/s
BM_ByteStreamSplitEncode_Double_Scalar/65536 125982 ns 125981 ns
5013 bytes_per_second=3.87584Gi/s
```
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