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| author | Sanjay Patel <spatel@rotateright.com> | 2016-10-11 14:14:30 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2016-10-11 14:14:30 +0000 |
| commit | 38a42e4bfa37e97f572c46d2d130d28b1ce7b696 (patch) | |
| tree | 1c19619db65a816a7d85a98ac97ec245d7493e39 /llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
| parent | 907ae691252863da2800bd7f1972cc2448333248 (diff) | |
| download | bcm5719-llvm-38a42e4bfa37e97f572c46d2d130d28b1ce7b696.tar.gz bcm5719-llvm-38a42e4bfa37e97f572c46d2d130d28b1ce7b696.zip | |
[DAG] simplify logic; NFC
llvm-svn: 283885
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 1e7b1ea604f..a00a48c9b5d 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -1912,14 +1912,12 @@ SDValue DAGCombiner::visitSUB(SDNode *N) { return N0.getOperand(0); // fold C2-(A+C1) -> (C2-C1)-A - ConstantSDNode *N1C1 = - N1.getOpcode() != ISD::ADD - ? nullptr - : dyn_cast<ConstantSDNode>(N1.getOperand(1).getNode()); - if (N1.getOpcode() == ISD::ADD && N0C && N1C1) { - SDValue NewC = - DAG.getConstant(N0C->getAPIntValue() - N1C1->getAPIntValue(), DL, VT); - return DAG.getNode(ISD::SUB, DL, VT, NewC, N1.getOperand(0)); + if (N1.getOpcode() == ISD::ADD && N0C) { + if (auto *N1C1 = dyn_cast<ConstantSDNode>(N1.getOperand(1).getNode())) { + SDValue NewC = + DAG.getConstant(N0C->getAPIntValue() - N1C1->getAPIntValue(), DL, VT); + return DAG.getNode(ISD::SUB, DL, VT, NewC, N1.getOperand(0)); + } } // fold ((A+(B+or-C))-B) -> A+or-C |
