After early-lowering the FORMAL_ARGUMENTS node, delete it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53874 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index b500b6a..12c54c1 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -4686,6 +4686,13 @@
(Result->getNumValues()+1 == TmpRes.Val->getNumValues() &&
TmpRes.getValue(Result->getNumValues()).getValueType() == MVT::Flag))
&& "Lowering produced unexpected number of results!");
+
+ // The FORMAL_ARGUMENTS node itself is likely no longer needed.
+ if (Result != TmpRes.Val && Result->use_empty()) {
+ HandleSDNode Dummy(DAG.getRoot());
+ DAG.RemoveDeadNode(Result);
+ }
+
Result = TmpRes.Val;
unsigned NumArgRegs = Result->getNumValues() - 1;