Index: llvm/lib/Transforms/Scalar/SCCP.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/SCCP.cpp
+++ llvm/lib/Transforms/Scalar/SCCP.cpp
@@ -2038,6 +2038,8 @@
   for (unsigned i = 0, e = ReturnsToZap.size(); i != e; ++i) {
     Function *F = ReturnsToZap[i]->getParent()->getParent();
     ReturnsToZap[i]->setOperand(0, UndefValue::get(F->getReturnType()));
+    for (Argument& A : F->args())
+      F->removeParamAttr(A.getArgNo(), Attribute::Returned);
   }
 
   // If we inferred constant or undef values for globals variables, we can
Index: llvm/test/Transforms/SCCP/ipsccp-clear-returned.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/SCCP/ipsccp-clear-returned.ll
@@ -0,0 +1,22 @@
+; if IPSCCP determines a function returns undef,
+; then the "returned" attribute of input arguments
+; should be cleared.
+
+; RUN: opt < %s -ipsccp -S | FileCheck %s
+define i32 @main() {
+; CHECK-LABEL: @main
+entry:
+; CHECK-NEXT: entry:
+  %call = call i32 @func_return_undef(i32 1)
+; CHECK: {{call.*@func_return_undef}}
+  ret i32 0
+}
+
+define internal i32 @func_return_undef(i32 returned %arg) {
+; CHECK: {{define.*@func_return_undef}}
+; CHECK-NOT: returned
+entry:
+; CHECK-NEXT: entry:
+; CHECK-NEXT: {{ret.*undef}}
+ret i32 %arg
+}