cyb70289 commented on PR #40335:
URL: https://github.com/apache/arrow/pull/40335#issuecomment-1987511710
Tested on Neoverse-N1. For clang, I see performance improvement from both
encoder and decode. But for gcc, there's some drop from the encoder.
**- clang-16, improvement from both encoder and decoder**
```
decode (improve)
----------------
BM_ByteStreamSplitDecode_Float_Scalar/1024 1167 ns 1167 ns
600395 bytes_per_second=3.27015Gi/s
BM_ByteStreamSplitDecode_Float_Scalar/4096 4648 ns 4648 ns
150615 bytes_per_second=3.28313Gi/s
BM_ByteStreamSplitDecode_Float_Scalar/32768 38248 ns 38247 ns
18300 bytes_per_second=3.19159Gi/s
BM_ByteStreamSplitDecode_Float_Scalar/65536 76448 ns 76446 ns
9159 bytes_per_second=3.19363Gi/s
BM_ByteStreamSplitDecode_Double_Scalar/1024 2814 ns 2814 ns
248735 bytes_per_second=2.71086Gi/s
BM_ByteStreamSplitDecode_Double_Scalar/4096 11236 ns 11236 ns
62307 bytes_per_second=2.7161Gi/s
BM_ByteStreamSplitDecode_Double_Scalar/32768 92623 ns 92616 ns
7551 bytes_per_second=2.63604Gi/s
BM_ByteStreamSplitDecode_Double_Scalar/65536 188190 ns 188185 ns
3728 bytes_per_second=2.59469Gi/s
BM_ByteStreamSplitDecode_Float_Neon/1024 817 ns 817 ns
856316 bytes_per_second=4.66674Gi/s
BM_ByteStreamSplitDecode_Float_Neon/4096 3240 ns 3240 ns
216075 bytes_per_second=4.71005Gi/s
BM_ByteStreamSplitDecode_Float_Neon/32768 26981 ns 26981 ns
25942 bytes_per_second=4.52429Gi/s
BM_ByteStreamSplitDecode_Float_Neon/65536 54189 ns 54186 ns
12924 bytes_per_second=4.50564Gi/s
BM_ByteStreamSplitDecode_Double_Neon/1024 1767 ns 1767 ns
396110 bytes_per_second=4.31715Gi/s
BM_ByteStreamSplitDecode_Double_Neon/4096 7138 ns 7137 ns
98106 bytes_per_second=4.27568Gi/s
BM_ByteStreamSplitDecode_Double_Neon/32768 64999 ns 64997 ns
10779 bytes_per_second=3.75616Gi/s
BM_ByteStreamSplitDecode_Double_Neon/65536 130243 ns 130243 ns
5366 bytes_per_second=3.74901Gi/s
encode (improve)
----------------
BM_ByteStreamSplitEncode_Float_Scalar/1024 1482 ns 1482 ns
472507 bytes_per_second=2.57419Gi/s
BM_ByteStreamSplitEncode_Float_Scalar/4096 5897 ns 5897 ns
118700 bytes_per_second=2.58776Gi/s
BM_ByteStreamSplitEncode_Float_Scalar/32768 47959 ns 47956 ns
14597 bytes_per_second=2.54548Gi/s
BM_ByteStreamSplitEncode_Float_Scalar/65536 95903 ns 95896 ns
7298 bytes_per_second=2.54588Gi/s
BM_ByteStreamSplitEncode_Double_Scalar/1024 2950 ns 2950 ns
237274 bytes_per_second=2.58627Gi/s
BM_ByteStreamSplitEncode_Double_Scalar/4096 11786 ns 11786 ns
59393 bytes_per_second=2.58938Gi/s
BM_ByteStreamSplitEncode_Double_Scalar/32768 98141 ns 98138 ns
7133 bytes_per_second=2.48773Gi/s
BM_ByteStreamSplitEncode_Double_Scalar/65536 198219 ns 198203 ns
3531 bytes_per_second=2.46354Gi/s
BM_ByteStreamSplitEncode_Float_Neon/1024 1152 ns 1152 ns
607844 bytes_per_second=3.31275Gi/s
BM_ByteStreamSplitEncode_Float_Neon/4096 4571 ns 4570 ns
153146 bytes_per_second=3.33858Gi/s
BM_ByteStreamSplitEncode_Float_Neon/32768 37086 ns 37084 ns
18873 bytes_per_second=3.29172Gi/s
BM_ByteStreamSplitEncode_Float_Neon/65536 74336 ns 74336 ns
9417 bytes_per_second=3.2843Gi/s
BM_ByteStreamSplitEncode_Double_Neon/1024 1978 ns 1978 ns
353156 bytes_per_second=3.85706Gi/s
BM_ByteStreamSplitEncode_Double_Neon/4096 7947 ns 7947 ns
87879 bytes_per_second=3.84032Gi/s
BM_ByteStreamSplitEncode_Double_Neon/32768 64458 ns 64458 ns
10863 bytes_per_second=3.7876Gi/s
BM_ByteStreamSplitEncode_Double_Neon/65536 128693 ns 128689 ns
5440 bytes_per_second=3.79428Gi/s
```
**- gcc-13, decoder improves, but encoder drops**
```
decode (improve)
----------------
BM_ByteStreamSplitDecode_Float_Scalar/1024 1133 ns 1133 ns
617695 bytes_per_second=3.3663Gi/s
BM_ByteStreamSplitDecode_Float_Scalar/4096 4484 ns 4484 ns
156105 bytes_per_second=3.40284Gi/s
BM_ByteStreamSplitDecode_Float_Scalar/32768 36318 ns 36318 ns
19273 bytes_per_second=3.36116Gi/s
BM_ByteStreamSplitDecode_Float_Scalar/65536 73048 ns 73047 ns
9554 bytes_per_second=3.34225Gi/s
BM_ByteStreamSplitDecode_Double_Scalar/1024 2814 ns 2814 ns
248738 bytes_per_second=2.7114Gi/s
BM_ByteStreamSplitDecode_Double_Scalar/4096 11227 ns 11226 ns
62355 bytes_per_second=2.71838Gi/s
BM_ByteStreamSplitDecode_Double_Scalar/32768 92482 ns 92478 ns
7552 bytes_per_second=2.64Gi/s
BM_ByteStreamSplitDecode_Double_Scalar/65536 185853 ns 185844 ns
3748 bytes_per_second=2.62737Gi/s
BM_ByteStreamSplitDecode_Float_Neon/1024 775 ns 775 ns
903307 bytes_per_second=4.92282Gi/s
BM_ByteStreamSplitDecode_Float_Neon/4096 3061 ns 3061 ns
228720 bytes_per_second=4.98565Gi/s
BM_ByteStreamSplitDecode_Float_Neon/32768 25543 ns 25542 ns
27405 bytes_per_second=4.77925Gi/s
BM_ByteStreamSplitDecode_Float_Neon/65536 51478 ns 51474 ns
13609 bytes_per_second=4.74294Gi/s
BM_ByteStreamSplitDecode_Double_Neon/1024 1626 ns 1626 ns
429095 bytes_per_second=4.69278Gi/s
BM_ByteStreamSplitDecode_Double_Neon/4096 6485 ns 6485 ns
107513 bytes_per_second=4.70567Gi/s
BM_ByteStreamSplitDecode_Double_Neon/32768 59680 ns 59680 ns
11757 bytes_per_second=4.09083Gi/s
BM_ByteStreamSplitDecode_Double_Neon/65536 120697 ns 120688 ns
5594 bytes_per_second=4.04582Gi/s
encode (drop)
-------------
BM_ByteStreamSplitEncode_Float_Scalar/1024 1142 ns 1142 ns
613228 bytes_per_second=3.34041Gi/s
BM_ByteStreamSplitEncode_Float_Scalar/4096 4511 ns 4511 ns
155178 bytes_per_second=3.3825Gi/s
BM_ByteStreamSplitEncode_Float_Scalar/32768 37560 ns 37560 ns
18636 bytes_per_second=3.25003Gi/s
BM_ByteStreamSplitEncode_Float_Scalar/65536 75348 ns 75343 ns
9301 bytes_per_second=3.2404Gi/s
BM_ByteStreamSplitEncode_Double_Scalar/1024 2201 ns 2201 ns
318028 bytes_per_second=3.46606Gi/s
BM_ByteStreamSplitEncode_Double_Scalar/4096 8795 ns 8795 ns
79615 bytes_per_second=3.46994Gi/s
BM_ByteStreamSplitEncode_Double_Scalar/32768 77388 ns 77383 ns
9045 bytes_per_second=3.15497Gi/s
BM_ByteStreamSplitEncode_Double_Scalar/65536 153900 ns 153900 ns
4543 bytes_per_second=3.17272Gi/s
BM_ByteStreamSplitEncode_Float_Neon/1024 1238 ns 1238 ns
565551 bytes_per_second=3.08201Gi/s
BM_ByteStreamSplitEncode_Float_Neon/4096 4894 ns 4893 ns
143073 bytes_per_second=3.11821Gi/s
BM_ByteStreamSplitEncode_Float_Neon/32768 39594 ns 39594 ns
17679 bytes_per_second=3.08304Gi/s
BM_ByteStreamSplitEncode_Float_Neon/65536 79201 ns 79200 ns
8838 bytes_per_second=3.0826Gi/s
BM_ByteStreamSplitEncode_Double_Neon/1024 2573 ns 2573 ns
272609 bytes_per_second=2.96532Gi/s
BM_ByteStreamSplitEncode_Double_Neon/4096 10249 ns 10248 ns
68149 bytes_per_second=2.97782Gi/s
BM_ByteStreamSplitEncode_Double_Neon/32768 88791 ns 88791 ns
7884 bytes_per_second=2.7496Gi/s
BM_ByteStreamSplitEncode_Double_Neon/65536 176888 ns 176888 ns
3958 bytes_per_second=2.7604Gi/s
```
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