Describe the enhancement requested

Currently, there are BYTE_STREAM_SPLIT optimizations using hand-written x86 intrinsics (for SSE4.2, AVX2 and AVX512), selected at compile-time.

We should rewrite those using the xsimd library so as to provide support for non-x86 ISA extensions such as Arm Neon (most importantly) and SVE.

More precisely:

• rewrite the SSE4.2 acceleration for generic 128-bit SIMD
• rewrite the AVX2 acceleration for generic 256-bit SIMD
• either rewrite the AVX512 acceleration, leave it alone, or remove it (the benefits are probably minor)

Component(s)

C++, Parquet