diff --git a/test/FrontendC/2011-03-31-ArrayRefFolding.c b/test/FrontendC/2011-03-31-ArrayRefFolding.c
new file mode 100644
index 00000000000..403927931c7
--- /dev/null
+++ b/test/FrontendC/2011-03-31-ArrayRefFolding.c
@@ -0,0 +1,15 @@
+// RUN: %llvmgcc -S -o - -m32 -Os %s | FileCheck %s
+// PR9571
+
+struct t {
+  int x;
+};
+
+extern struct t *cfun;
+
+int f(void) {
+  if (!(cfun + 0))
+// CHECK: icmp eq %struct.t* %0, null
+    return 0;
+  return cfun->x;
+}