--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/CodeGenObjC/pass-by-value-noalias.m	Tue Jun 15 19:15:29 2021 +0900
@@ -0,0 +1,22 @@
+// RUN: %clang_cc1 -fpass-by-value-is-noalias -triple arm64-apple-iphoneos -emit-llvm -disable-llvm-optzns -fobjc-runtime-has-weak -fobjc-arc -fobjc-dispatch-method=mixed %s -o - 2>&1 | FileCheck --check-prefix=WITH_NOALIAS %s
+// RUN: %clang_cc1 -triple arm64-apple-iphoneos -emit-llvm -disable-llvm-optzns -fobjc-runtime-has-weak -fobjc-arc -fobjc-dispatch-method=mixed %s -o - 2>&1 | FileCheck --check-prefix=NO_NOALIAS %s
+
+@interface Bar
+@property char value;
+@end
+
+// A struct large enough so it is not passed in registers on ARM64, but with a
+// weak reference, so noalias should not be added even with
+// -fpass-by-value-is-noalias.
+struct Foo {
+  int a;
+  int b;
+  int c;
+  int d;
+  int e;
+  Bar *__weak f;
+};
+
+// WITH_NOALIAS: define{{.*}} void @take(%struct.Foo* %arg)
+// NO_NOALIAS: define{{.*}} void @take(%struct.Foo* %arg)
+void take(struct Foo arg) {}