diff --git a/test/FrontendC/object_size.c b/test/FrontendC/object_size.c
new file mode 100644
index 00000000000..0ddd66bc38c
--- /dev/null
+++ b/test/FrontendC/object_size.c
@@ -0,0 +1,16 @@
+// RUN: %llvmgcc -S -emit-llvm -O1 %s -o - | grep ret | grep {\\-1} | count 1
+// RUN: %llvmgcc -S -emit-llvm -O1 %s -o - | grep ret | grep {0}  | count 1
+// RUN: %llvmgcc -S -emit-llvm -O1 %s -o - | grep ret | grep {8}  | count 1
+
+unsigned t1(void *d) {
+  return __builtin_object_size(d, 0);
+}
+
+unsigned t2(void *d) {
+  return __builtin_object_size(d, 2);
+}
+
+char buf[8];
+unsigned t3() {
+  return __builtin_object_size(buf, 0);
+}