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

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: RKSimon, efriedma, mivnay, SjoerdMeijer, samtebbs.
Herald added subscribers: ecnelises, danielkiss, hiraditya, kristof.beyls.
Herald added a project: LLVM.
dmgreen requested review of this revision.

This ports the AArch64 SABD and USBD over to DAG Combine, where they can be used by more backends (notably MVE in a follow-up patch). The matching code has changed very little, just to handle legal operations and types differently. It selects from (ABS (SUB (EXTEND a), (EXTEND b))), producing a ubds/abdu which is zexted to the original type.


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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