[PATCH] D57317: [DAGCombine] Deduplicate addcarry node using commutativity.

[Amaury SECHET via Phabricator via llvm-commits]

deadalnix created this revision.
deadalnix added reviewers: hfinkel, RKSimon, craig.topper.

The first two parameters of addcarry are commutative. We may face a situation where both variant are present in the DAG, in which case we benefit from using just one.

Depends on D57302 <https://reviews.llvm.org/D57302> and D33587 <https://reviews.llvm.org/D33587>


Repository:
  rL LLVM

https://reviews.llvm.org/D57317

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

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