[PATCH] D122084: [X86] combineAddOrSubToADCOrSBB - Fold ADD/SUB + (AND(SRL(X,Y),1) -> ADC/SBB+BT(X,Y)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
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As suggested on PR35908, if we are adding/subtracting an extracted bit, attempt to use BT instead to fold the op and use a ADC/SBB op.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D122084

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/add-sub-bool.ll

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