1 files changed, 10 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 31df458c20d..c6167aa3aac 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -3032,6 +3032,16 @@ void SelectionDAGLegalize::ExpandNode(SDNode *Node) {
     Results.push_back(Results[0].getValue(1));
     break;
   }
+  case ISD::FSUB: {
+    EVT VT = Node->getValueType(0);
+    assert(TLI.isOperationLegalOrCustom(ISD::FADD, VT) &&
+           TLI.isOperationLegalOrCustom(ISD::FNEG, VT) &&
+           "Don't know how to expand this FP subtraction!");
+    Tmp1 = DAG.getNode(ISD::FNEG, dl, VT, Node->getOperand(1));
+    Tmp1 = DAG.getNode(ISD::FADD, dl, VT, Node->getOperand(0), Tmp1);
+    Results.push_back(Tmp1);
+    break;
+  }
   case ISD::SUB: {
     EVT VT = Node->getValueType(0);
     assert(TLI.isOperationLegalOrCustom(ISD::ADD, VT) &&