1 files changed, 30 insertions, 0 deletions
diff --git a/clang/test/CodeGen/object-size.cpp b/clang/test/CodeGen/object-size.cpp
new file mode 100644
index 00000000000..1c9d1ae945d
--- /dev/null
+++ b/clang/test/CodeGen/object-size.cpp
@@ -0,0 +1,30 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin -emit-llvm -o - %s | FileCheck %s
+
+// C++-specific tests for __builtin_object_size
+
+int gi;
+
+// CHECK-LABEL: define void @_Z5test1v()
+void test1() {
+  // Guaranteeing that our cast removal logic doesn't break more interesting
+  // cases.
+  struct A { int a; };
+  struct B { int b; };
+  struct C: public A, public B {};
+
+  C c;
+
+  // CHECK: store i32 8
+  gi = __builtin_object_size(&c, 0);
+  // CHECK: store i32 8
+  gi = __builtin_object_size((A*)&c, 0);
+  // CHECK: store i32 4
+  gi = __builtin_object_size((B*)&c, 0);
+
+  // CHECK: store i32 8
+  gi = __builtin_object_size((char*)&c, 0);
+  // CHECK: store i32 8
+  gi = __builtin_object_size((char*)(A*)&c, 0);
+  // CHECK: store i32 4
+  gi = __builtin_object_size((char*)(B*)&c, 0);
+}