+
+/// During lowering new call nodes can be created (such as memset, etc.).
+/// Those will become new roots of the current DAG, but complications arise
+/// when they are tail calls. In such cases, the call lowering will update
+/// the root, but the builder still needs to know that a tail call has been
+/// lowered in order to avoid generating an additional return.
+void SelectionDAGBuilder::updateDAGForMaybeTailCall(SDValue MaybeTC) {
+ // If the node is null, we do have a tail call.
+ if (MaybeTC.getNode() != nullptr)
+ DAG.setRoot(MaybeTC);
+ else
+ HasTailCall = true;
+}
+