gstvg commented on PR #8967:
URL: https://github.com/apache/arrow-rs/pull/8967#issuecomment-3625576338

   The justification to use intrinsics is that currently llvm generates 
suboptimal vectorization for bitmask packing, see  
https://github.com/llvm/llvm-project/issues/96395 and 
https://github.com/llvm/llvm-project/issues/121691


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