1 files changed, 43 insertions, 0 deletions
diff --git a/test/CodeGenCXX/varargs.cpp b/test/CodeGenCXX/varargs.cpp
new file mode 100644
index 000000000000..af34336a0ae2
--- /dev/null
+++ b/test/CodeGenCXX/varargs.cpp
@@ -0,0 +1,43 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm %s -o - | FileCheck %s
+
+// rdar://7309675
+// PR4678
+namespace test0 {
+  // test1 should be compmiled to be a varargs function in the IR even
+  // though there is no way to do a va_begin.  Otherwise, the optimizer
+  // will warn about 'dropped arguments' at the call site.
+
+  // CHECK: define i32 @_ZN5test05test1Ez(...)
+  int test1(...) {
+    return -1;
+  }
+
+  // CHECK: call i32 (...)* @_ZN5test05test1Ez(i32 0)
+  void test() {
+    test1(0);
+  }
+}
+
+namespace test1 {
+  struct A {
+    int x;
+    int y;
+  };
+
+  void foo(...);
+
+  void test() {
+    A x;
+    foo(x);
+  }
+  // CHECK:    define void @_ZN5test14testEv()
+  // CHECK:      [[X:%.*]] = alloca [[A:%.*]], align 4
+  // CHECK-NEXT: [[TMP:%.*]] = alloca [[A]], align 4
+  // CHECK-NEXT: [[T0:%.*]] = bitcast [[A]]* [[TMP]] to i8*
+  // CHECK-NEXT: [[T1:%.*]] = bitcast [[A]]* [[X]] to i8*
+  // CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[T0]], i8* [[T1]], i64 8, i32 4, i1 false)
+  // CHECK-NEXT: [[T0:%.*]] = bitcast [[A]]* [[TMP]] to i64*
+  // CHECK-NEXT: [[T1:%.*]] = load i64* [[T0]], align 1
+  // CHECK-NEXT: call void (...)* @_ZN5test13fooEz(i64 [[T1]])
+  // CHECK-NEXT: ret void
+}