js8544 commented on issue #38623:
URL: https://github.com/apache/arrow/issues/38623#issuecomment-1801670897
> is it supposed to run any x86_64 platforms even without sse4_2
It depends. Do you plan to compile it on a machine with SSE4.2 support and
run it on machines without? Then you should propably pass
`-DARROW_C_FLAGS_${BUILD_TYPE}=-march=<your target architecture>` (i.e. cross
compiling) to CMake to disable auto-generated SSE4.2 instructions (see
[this](https://arrow.apache.org/docs/developers/cpp/building.html#manual-configuration)),
as well as `ARROW_HAVE_SSE4_2=OFF` for arrow's explicit SSE4.2 intrinsics.
Also if you plan to use it on Windows, `POPCNT` may be a required
instruction (see https://github.com/apache/arrow/issues/21840).
> it will dynamically choose max simd level we can use
Nope. Only the compute functions do this. Other places use the compile time
constant `ARROW_HAVE_SSE4_2`.
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