--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/CodeGen/mrtd.c	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,28 @@
+// RUN: %clang_cc1 -mrtd -triple i386-unknown-unknown -std=c89 -emit-llvm -o - %s 2>&1 | FileCheck %s
+
+// CHECK: mrtd.c:10:3: warning: function with no prototype cannot use the stdcall calling convention
+
+void baz(int arg);
+
+// CHECK: define x86_stdcallcc void @foo(i32 %arg) [[NUW:#[0-9]+]]
+void foo(int arg) {
+// CHECK: call x86_stdcallcc i32 bitcast (i32 (...)* @bar to i32 (i32)*)(
+  bar(arg);
+// CHECK: call x86_stdcallcc void @baz(i32
+  baz(arg);
+}
+
+// CHECK: declare x86_stdcallcc i32 @bar(...)
+
+// CHECK: declare x86_stdcallcc void @baz(i32)
+
+void qux(int arg, ...) { }
+// CHECK: define void @qux(i32 %arg, ...)
+
+void quux(int a1, int a2, int a3) {
+  qux(a1, a2, a3);
+}
+// CHECK-LABEL: define x86_stdcallcc void @quux
+// CHECK: call void (i32, ...) @qux
+
+// CHECK: attributes [[NUW]] = { noinline nounwind{{.*}} }