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| author | Amaury Sechet <deadalnix@gmail.com> | 2017-02-06 14:28:39 +0000 |
|---|---|---|
| committer | Amaury Sechet <deadalnix@gmail.com> | 2017-02-06 14:28:39 +0000 |
| commit | 1d466f598e91cc26c07ffc52e842fe1f1d27be0b (patch) | |
| tree | 429687266a3080942bdbc1bd4b50c34296907262 /llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
| parent | bdf3c5af6adf7d30cee7c6c1d9fb3d0b33df3789 (diff) | |
| download | bcm5719-llvm-1d466f598e91cc26c07ffc52e842fe1f1d27be0b.tar.gz bcm5719-llvm-1d466f598e91cc26c07ffc52e842fe1f1d27be0b.zip | |
[DAGCombiner] (add X, (adde Y, 0, Carry)) -> (adde X, Y, Carry)
Summary: This is extracted from D29443 .
Reviewers: mkuper, spatel, RKSimon, zvi, bkramer
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D29564
llvm-svn: 294186
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 8028eb3567e..60a62ed39f2 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -1834,6 +1834,12 @@ SDValue DAGCombiner::visitADDLike(SDValue N0, SDValue N1, SDNode *LocReference) } } + // (add X, (adde Y, 0, Carry)) -> (adde X, Y, Carry) + if (N1.getOpcode() == ISD::ADDE && N1->hasOneUse() && + isNullConstant(N1.getOperand(1))) + return DAG.getNode(ISD::ADDE, DL, DAG.getVTList(VT, MVT::Glue), + N0, N1->getOperand(0), N1->getOperand(2)); + return SDValue(); } |
