[PATCH] D142344: [DAGCombiner] Add Transform for `(and/or (eq/ne A,Pow2),(eq/ne A,-Pow2))`->`(eq/ne (and (and A,Pow2),~(Pow2*2)), 0)`

[Noah Goldstein via Phabricator via llvm-commits]

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In many instances this can be preferable if the `icmp` -> `i1` cannot be
done in one instruction (such as X86 for scalars).

At the moment guarded behind `TLI.isDesirableToCombineLogicOpOfSETCC`.

alive2 links:
https://alive2.llvm.org/ce/z/nLm5sN
https://alive2.llvm.org/ce/z/moEcyE


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142344

Files:
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.h
  llvm/test/CodeGen/X86/icmp-pow2-logic-npow2.ll

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