diff --git a/llvm/test/CodeGen/X86/byval5.ll b/llvm/test/CodeGen/X86/byval5.ll
new file mode 100644
index 000000000000..95bf3f4239df
--- /dev/null
+++ b/llvm/test/CodeGen/X86/byval5.ll
@@ -0,0 +1,28 @@
+; RUN: llvm-as < %s | llc -march=x86-64 | grep rep.movsl | count 2
+; RUN: llvm-as < %s | llc -march=x86 | grep rep.movsb	 | count 2
+
+%struct.s = type { i8, i8, i8, i8, i8, i8 }
+
+
+define void @g(i8 signext  %a1, i8 signext  %a2, i8 signext  %a3,
+	 i8 signext  %a4, i8 signext  %a5, i8 signext  %a6) {
+entry:
+        %a = alloca %struct.s
+        %tmp = getelementptr %struct.s* %a, i32 0, i32 0
+        store i8 %a1, i8* %tmp, align 8
+        %tmp2 = getelementptr %struct.s* %a, i32 0, i32 1
+        store i8 %a2, i8* %tmp2, align 8
+        %tmp4 = getelementptr %struct.s* %a, i32 0, i32 2
+        store i8 %a3, i8* %tmp4, align 8
+        %tmp6 = getelementptr %struct.s* %a, i32 0, i32 3
+        store i8 %a4, i8* %tmp6, align 8
+        %tmp8 = getelementptr %struct.s* %a, i32 0, i32 4
+        store i8 %a5, i8* %tmp8, align 8
+        %tmp10 = getelementptr %struct.s* %a, i32 0, i32 5
+        store i8 %a6, i8* %tmp10, align 8
+        call void @f( %struct.s* %a byval )
+        call void @f( %struct.s* %a byval )
+        ret void
+}
+
+declare void @f(%struct.s* byval)