[PATCH] D143382: [ARM] Remove reduce(shuffle) if all the lanes are used

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
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This looks for vaddv(shuffle) or vmlav(shuffle, shuffle), with a shuffle where all the lanes are used once. Due to the reduction being commutative the shuffle can be removed.


https://reviews.llvm.org/D143382

Files:
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/test/CodeGen/Thumb2/mve-vecreduce-add-combine.ll

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