[PATCH] D91937: [ISel] Port AArch64 SABD and UABD to DAGCombine

[Dave Green via Phabricator via llvm-commits]

dmgreen updated this revision to Diff 307632.
dmgreen marked an inline comment as done.
dmgreen added a comment.

Thanks for taking a look.

> What other archs have equivalent instructions?

It was MVE I was hoping to share this with, over in the ARM backend. I don't know if any other backend would find this useful too - it would be great if they did. I find it hard enough to know what ARM instructions do some of the time let along other architectures! I believe the X86 instruction (PSADBW) works quite differently, as it includes a reduction step?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D91937/new/

https://reviews.llvm.org/D91937

Files:
  llvm/include/llvm/CodeGen/ISDOpcodes.h
  llvm/include/llvm/Target/TargetSelectionDAG.td
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
  llvm/lib/CodeGen/TargetLoweringBase.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.h
  llvm/lib/Target/AArch64/AArch64InstrInfo.td

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