[PATCH] D141706: [DAG][ARM][AArch64] Transform max(a, b) - min(a,b) -> abd(a,b)

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: RKSimon, spatel, efriedma.
Herald added subscribers: StephenFan, ecnelises, hiraditya, kristof.beyls.
Herald added a project: All.
dmgreen requested review of this revision.
Herald added a project: LLVM.

This adds both signed and unsigned transforms for `max(a, b) - min(a,b)` -> `abd(a,b)`.
unsigned: https://alive2.llvm.org/ce/z/RF4jGQ
signed: https://alive2.llvm.org/ce/z/Cjr2zE


https://reviews.llvm.org/D141706

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/AArch64/neon-abd.ll

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