diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index c34f095e19cbf..fd40e02f5f8e5 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -12043,6 +12043,12 @@ void SelectionDAGISel::LowerArguments(const Function &F) {
           OutVal = DAG.getNode(ISD::AssertNoFPClass, dl, OutVal.getValueType(),
                                OutVal, SDNoFPClass);
         }
+
+        if (Arg.hasAttribute(Attribute::Alignment)) {
+          OutVal =
+              DAG.getAssertAlign(dl, OutVal, Arg.getParamAlign().valueOrOne());
+        }
+
         ArgValues.push_back(OutVal);
       }