diff --git a/gcc/testsuite/gcc.dg/asm-4.c b/gcc/testsuite/gcc.dg/asm-4.c
new file mode 100644
index 00000000000..662f5d55612
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/asm-4.c
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+int main()
+{
+  int x;
+
+  asm volatile ("test0 X%0Y%[arg]Z" : [arg] "=g" (x));
+  asm volatile ("test1 X%[out]Y%[in]Z" : [out] "=g" (x) : [in] "0"(x));
+}
+
+/* ??? Someone explain why the back reference dosn't work.  */
+/* { dontdg-final { scan-assembler "test0 X(.*)Y\1Z" } } */
+/* { dontdg-final { scan-assembler "test1 X(.*)Y\1Z" } } */