diff --git a/test/CodeGen/X86/2008-04-28-CyclicSchedUnit.ll b/test/CodeGen/X86/2008-04-28-CyclicSchedUnit.ll
new file mode 100644
index 00000000000..d105bcd5209
--- /dev/null
+++ b/test/CodeGen/X86/2008-04-28-CyclicSchedUnit.ll
@@ -0,0 +1,6 @@
+; RUN: llvm-as < %s | llc
+
+define i64 @t(i64 %maxIdleDuration) nounwind  {
+	call void asm sideeffect "wrmsr", "{cx},A,~{dirflag},~{fpsr},~{flags}"( i32 416, i64 0 ) nounwind 
+	unreachable
+}