zanmato1984 commented on issue #40333:
URL: https://github.com/apache/arrow/issues/40333#issuecomment-1976082113
> I guess it doesn't 🤔?
>
> `ARROW_USER_SIMD_LEVEL` env controls the dynamically dispatch the instr,
and controls the `CpuInfo` struct. However, some code are under
`ARROW_HAVE_RUNTIME_{}` flag[1], and some are under `ARROW_HAVE_{}` flag[2]...
>
> 1.
https://github.com/apache/arrow/blob/640667664abbdb9ddf38d32781715cc783a69885/cpp/src/parquet/level_comparison.cc#L30
> 2.
https://github.com/apache/arrow/blob/640667664abbdb9ddf38d32781715cc783a69885/cpp/src/arrow/csv/lexing_internal.h#L122
Oh I got your point.
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