[PATCH] D59208: [DAGCombiner] fold (addcarry (xor a, -1), b, c) -> (subcarry b, a, !c) and flip carry.

[Amaury SECHET via Phabricator via llvm-commits]

deadalnix updated this revision to Diff 207909.
deadalnix added a comment.

Add a comment explainign what extractBooleanFlip does.

By default, only flip the boolean if it is cheaper to compute.


Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D59208/new/

https://reviews.llvm.org/D59208

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/addcarry.ll
  test/CodeGen/X86/subcarry.ll

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