wesm edited a comment on pull request #7521:
URL: https://github.com/apache/arrow/pull/7521#issuecomment-647825256
FWIW on the "gcc/clang perf discussion", clang-8 also shows performance
benefits and limited downside
```
benchmark baseline contender change %
regression
2 UniqueInt64/11 6.444 GiB/sec 18.511 GiB/sec 187.240
False
31 UniqueInt64/5 6.470 GiB/sec 18.390 GiB/sec 184.244
False
39 UniqueUInt8/5 810.180 MiB/sec 1.747 GiB/sec 120.867
False
26 UniqueUInt8/1 683.475 MiB/sec 1.430 GiB/sec 114.196
False
42 UniqueInt64/4 5.424 GiB/sec 6.965 GiB/sec 28.397
False
18 UniqueInt64/1 2.672 GiB/sec 3.411 GiB/sec 27.627
False
40 UniqueUInt8/2 654.320 MiB/sec 826.916 MiB/sec 26.378
False
33 UniqueUInt8/4 758.115 MiB/sec 947.360 MiB/sec 24.962
False
25 UniqueInt64/10 5.248 GiB/sec 6.426 GiB/sec 22.460
False
9 UniqueString100bytes/5 26.923 GiB/sec 32.142 GiB/sec 19.384
False
35 UniqueString10bytes/11 2.691 GiB/sec 3.207 GiB/sec 19.173
False
3 UniqueString10bytes/5 2.695 GiB/sec 3.200 GiB/sec 18.731
False
20 UniqueString100bytes/11 26.909 GiB/sec 31.831 GiB/sec 18.291
False
30 UniqueInt64/7 2.514 GiB/sec 2.890 GiB/sec 14.960
False
37 UniqueInt64/2 2.619 GiB/sec 2.975 GiB/sec 13.578
False
11 UniqueString10bytes/4 2.487 GiB/sec 2.700 GiB/sec 8.596
False
32 UniqueString10bytes/10 2.386 GiB/sec 2.589 GiB/sec 8.481
False
0 UniqueString100bytes/4 24.419 GiB/sec 26.365 GiB/sec 7.966
False
38 UniqueString100bytes/10 22.463 GiB/sec 24.128 GiB/sec 7.411
False
34 UniqueInt64/8 2.392 GiB/sec 2.563 GiB/sec 7.157
False
19 UniqueString10bytes/1 781.817 MiB/sec 835.760 MiB/sec 6.900
False
43 UniqueInt64/3 2.184 GiB/sec 2.331 GiB/sec 6.721
False
24 UniqueString10bytes/7 583.523 MiB/sec 621.007 MiB/sec 6.424
False
15 UniqueString100bytes/7 1.936 GiB/sec 2.024 GiB/sec 4.538
False
6 UniqueString10bytes/2 780.337 MiB/sec 805.686 MiB/sec 3.248
False
27 UniqueString100bytes/2 3.934 GiB/sec 4.059 GiB/sec 3.197
False
13 UniqueString100bytes/1 3.898 GiB/sec 3.995 GiB/sec 2.485
False
7 UniqueString10bytes/8 592.115 MiB/sec 604.865 MiB/sec 2.153
False
29 UniqueString100bytes/8 1.969 GiB/sec 2.011 GiB/sec 2.111
False
21 UniqueInt64/9 2.034 GiB/sec 2.048 GiB/sec 0.676
False
1 BuildStringDictionary 85.937 MiB/sec 85.928 MiB/sec -0.010
False
41 UniqueUInt8/3 449.171 MiB/sec 448.844 MiB/sec -0.073
False
28 UniqueString100bytes/0 4.084 GiB/sec 4.077 GiB/sec -0.161
False
4 UniqueString100bytes/3 4.255 GiB/sec 4.235 GiB/sec -0.450
False
5 UniqueString100bytes/6 2.054 GiB/sec 2.033 GiB/sec -1.041
False
14 UniqueString100bytes/9 2.138 GiB/sec 2.107 GiB/sec -1.449
False
8 UniqueUInt8/0 1.777 GiB/sec 1.750 GiB/sec -1.487
False
23 UniqueInt64/0 3.860 GiB/sec 3.799 GiB/sec -1.560
False
10 UniqueString10bytes/9 616.458 MiB/sec 605.470 MiB/sec -1.782
False
22 UniqueString10bytes/3 799.494 MiB/sec 783.825 MiB/sec -1.960
False
17 UniqueString10bytes/6 647.921 MiB/sec 631.631 MiB/sec -2.514
False
36 BuildDictionary 1.539 GiB/sec 1.498 GiB/sec -2.694
False
16 UniqueInt64/6 3.193 GiB/sec 3.077 GiB/sec -3.634
False
12 UniqueString10bytes/0 881.975 MiB/sec 839.487 MiB/sec -4.817
False
```
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