[PATCH] D143396: [ARM] Perform lane interleaving from reductions.

[Dave Green via Phabricator via llvm-commits]

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We have a pass for MVE to perform lane interleaving to make use of top/bottom instructions, that adds shuffles before extends and after truncates. This extends it to also start from add reductions, where the order of lanes does not matter so the shuffle is not needed. We need to be careful about not breaking the form of existing reductions, but otherwise can save some instructions and awkward extends.


https://reviews.llvm.org/D143396

Files:
  llvm/lib/Target/ARM/MVELaneInterleavingPass.cpp
  llvm/test/CodeGen/Thumb2/mve-laneinterleaving-reduct.ll

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