[PATCH] D105686: [ARM] Move add(VMLALVA(A, X, Y), B) to VMLALVA(add(A, B), X, Y)

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: samtebbs, SjoerdMeijer, NickGuy, simon_tatham, ostannard.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
dmgreen requested review of this revision.
Herald added a project: LLVM.

For i64 reductions we currently try and convert add(VMLALV(X, Y), B) to VMLALVA(B, X, Y), incorporating the addition into the VMLALVA.  If we have an add of an existing VMLALVA, this patch pushes the add up above the VMLALVA so that it may potentially be simplified further, for example being folded into another VMLALV.


https://reviews.llvm.org/D105686

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

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