cyb70289 commented on PR #13661:
URL: https://github.com/apache/arrow/pull/13661#issuecomment-1191141999
Not sure of gcc version used in conbench.
From gcc-10 man:
```
-O3 Optimize yet more. -O3 turns on all optimizations specified by -O2 and
also turns on the following optimization
flags:
-fgcse-after-reload -finline-functions -fipa-cp-clone -floop-interchange
-floop-unroll-and-jam -fpeel-loops
-fpredictive-commoning -fsplit-paths -ftree-loop-distribute-patterns
-ftree-loop-distribution -ftree-loop-vectorize
-ftree-partial-pre -ftree-slp-vectorize -funswitch-loops
-fvect-cost-model -fversion-loops-for-strides
```
Perhaps try `-O2 -ftree-loop-vectorize`? This does impact
`arrow-bit-util-benchmark` gcc benchmark result per my test.
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