[PATCH] D46505: [DAGcombine] Teach the combiner about -a = ~a + 1

[Amaury SECHET via Phabricator via llvm-commits]

deadalnix updated this revision to Diff 148713.
deadalnix added a comment.

Use isBitwiseNot
Merge flipBooleanConstant into flipBoolean
Add more specific test cases.


Repository:
  rL LLVM

https://reviews.llvm.org/D46505

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

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