wesm commented on pull request #7521:
URL: https://github.com/apache/arrow/pull/7521#issuecomment-647888437
FWIW the performance issue seems to be more pronounced on gcc than clang,
here is the benchmark comparison on my machine with clang-8
```
benchmark baseline
contender change % counters
1 SortToIndicesInt64Count/32768/10000/min_time:1.000 1.560 GiB/sec
2.000 GiB/sec 28.163 {'iterations': 70030, 'null_percent': 0.01}
15 SortToIndicesInt64Compare/32768/10000/min_time:1.000 145.735 MiB/sec
158.918 MiB/sec 9.046 {'iterations': 6654, 'null_percent': 0.01}
5 SortToIndicesInt64Compare/32768/100/min_time:1.000 149.117 MiB/sec
159.609 MiB/sec 7.036 {'iterations': 6545, 'null_percent': 1.0}
7 SortToIndicesInt64Compare/32768/0/min_time:1.000 153.027 MiB/sec
162.227 MiB/sec 6.012 {'iterations': 6862, 'null_percent': 0.0}
4 SortToIndicesInt64Compare/32768/10/min_time:1.000 160.419 MiB/sec
167.725 MiB/sec 4.554 {'iterations': 6934, 'null_percent': 10.0}
2 SortToIndicesInt64Compare/32768/2/min_time:1.000 255.024 MiB/sec
260.284 MiB/sec 2.063 {'iterations': 11390, 'null_percent': 50.0}
9 SortToIndicesInt64Count/32768/100/min_time:1.000 1.486 GiB/sec
1.458 GiB/sec -1.912 {'iterations': 66757, 'null_percent': 1.0}
10 SortToIndicesInt64Count/32768/0/min_time:1.000 2.143 GiB/sec
2.067 GiB/sec -3.568 {'iterations': 98191, 'null_percent': 0.0}
13 SortToIndicesInt64Count/8388608/1/min_time:1.000 4.215 GiB/sec
3.813 GiB/sec -9.531 {'iterations': 762, 'null_percent': 100.0}
11 SortToIndicesInt64Count/32768/2/min_time:1.000 679.023 MiB/sec
609.379 MiB/sec -10.256 {'iterations': 29602, 'null_percent': 50.0}
0 SortToIndicesInt64Count/1048576/1/min_time:1.000 4.487 GiB/sec
4.021 GiB/sec -10.400 {'iterations': 6550, 'null_percent': 100.0}
12 SortToIndicesInt64Compare/8388608/1/min_time:1.000 4.250 GiB/sec
3.762 GiB/sec -11.476 {'iterations': 766, 'null_percent': 100.0}
6 SortToIndicesInt64Count/32768/1/min_time:1.000 4.758 GiB/sec
4.185 GiB/sec -12.040 {'iterations': 217705, 'null_percent': 100.0}
8 SortToIndicesInt64Compare/32768/1/min_time:1.000 4.730 GiB/sec
4.125 GiB/sec -12.780 {'iterations': 213908, 'null_percent': 100.0}
3 SortToIndicesInt64Compare/1048576/1/min_time:1.000 4.556 GiB/sec
3.953 GiB/sec -13.228 {'iterations': 6539, 'null_percent': 100.0}
14 SortToIndicesInt64Count/32768/10/min_time:1.000 1.316 GiB/sec
1.051 GiB/sec -20.108 {'iterations': 59539, 'null_percent': 10.0}
```
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