diff --git a/llvm/test/Regression/CFrontend/2006-12-14-ordered_expr.c b/llvm/test/Regression/CFrontend/2006-12-14-ordered_expr.c
new file mode 100644
index 000000000000..4e7dafe82d00
--- /dev/null
+++ b/llvm/test/Regression/CFrontend/2006-12-14-ordered_expr.c
@@ -0,0 +1,7 @@
+// RUN: %llvmgcc -O3 -S %s -o - | grep llvm.isunordered &&
+// RUN: %llvmgcc -O3 -S %s -o - | grep xor
+
+int test2(float X, float Y) {
+  return !__builtin_isunordered(X, Y);
+}
+