[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 created this revision.
deadalnix added reviewers: hfinkel, RKSimon, craig.topper.
Herald added a project: LLVM.

As per title. DAGCombiner only mathes the special case where b = 0, this patches extends the pattern to match any value of b.

Depends on D57302 <https://reviews.llvm.org/D57302>


Repository:
  rL LLVM

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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