GH-46962: [C++][Parquet] Generic xsimd function and dynamic dispatch for Byte Stream Split#46963

Merged

pitrou merged 22 commits into

apache:mainfrom

AntoinePrv:byte-steam

Jul 8, 2025

Commits on Jul 8, 2025

Generic xsimd functions

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Add ByteStreamSplitDecodeAvx2<2>

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Roll up branch in ByteStreamSplitDecodeAvx2

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Change Avx2 encode algorithm

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Xsimd decode explicit variable names

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Add scalar Int16 benchmarks

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Similar benchmark range for neon

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Add dynamic dispatch

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Code cleanup

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Remove AVX2 intrinsic from Decode

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Review comments

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Add missing export macros

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Fmt

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Fix xsimd constant

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Add missing internal exports

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Ensure MSVC has SSE4.2 enabled
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Add static_assert for more diagnosing
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Try a workaround
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Undo temporary debug diagnosis
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Avoid outdated xsimd version when building Unix wheels
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Stop installing xsimd from vcpkg, since it otherwise conflicts with the bundled version
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Remove comment
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