1 files changed, 33 insertions, 0 deletions
diff --git a/test/CodeGenCXX/pr20897.cpp b/test/CodeGenCXX/pr20897.cpp
new file mode 100644
index 000000000000..49d669bd7eab
--- /dev/null
+++ b/test/CodeGenCXX/pr20897.cpp
@@ -0,0 +1,33 @@
+// RUN: %clang_cc1 -triple i686-windows-msvc   -emit-llvm -std=c++1y -O0 -o - %s | FileCheck %s
+struct Base {};
+
+// __declspec(dllexport) causes us to export the implicit constructor.
+struct __declspec(dllexport) Derived : virtual Base {
+// CHECK-LABEL: define weak_odr dllexport x86_thiscallcc %struct.Derived* @"\01??0Derived@@QAE@ABU0@@Z"
+// CHECK:      %[[this:.*]] = load %struct.Derived** {{.*}}
+// CHECK-NEXT: store %struct.Derived* %[[this]], %struct.Derived** %[[retval:.*]]
+// CHECK:      %[[dest_a_gep:.*]] = getelementptr inbounds %struct.Derived* %[[this]], i32 0, i32 1
+// CHECK-NEXT: %[[src_load:.*]]   = load %struct.Derived** {{.*}}
+// CHECK-NEXT: %[[src_a_gep:.*]]  = getelementptr inbounds %struct.Derived* %[[src_load:.*]], i32 0, i32 1
+// CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %[[dest_a_gep]], i8* %[[src_a_gep]], i64 1, i32 4, i1 false)
+// CHECK-NEXT: %[[dest_this:.*]] = load %struct.Derived** %[[retval]]
+// CHECK-NEXT: ret %struct.Derived* %[[dest_this]]
+  bool a : 1;
+  bool b : 1;
+};
+
+// __declspec(dllexport) causes us to export the implicit copy constructor.
+struct __declspec(dllexport) Derived2 : virtual Base {
+// CHECK-LABEL: define weak_odr dllexport x86_thiscallcc %struct.Derived2* @"\01??0Derived2@@QAE@ABU0@@Z"
+// CHECK:      %[[this:.*]] = load %struct.Derived2** {{.*}}
+// CHECK-NEXT: store %struct.Derived2* %[[this]], %struct.Derived2** %[[retval:.*]]
+// CHECK:      %[[dest_a_gep:.*]] = getelementptr inbounds %struct.Derived2* %[[this]], i32 0, i32 1
+// CHECK-NEXT: %[[src_load:.*]]   = load %struct.Derived2** {{.*}}
+// CHECK-NEXT: %[[src_a_gep:.*]]  = getelementptr inbounds %struct.Derived2* %[[src_load:.*]], i32 0, i32 1
+// CHECK-NEXT: %[[dest_a_bitcast:.*]]  = bitcast [1 x i32]* %[[dest_a_gep]] to i8*
+// CHECK-NEXT: %[[src_a_bitcast:.*]] = bitcast [1 x i32]* %[[src_a_gep]] to i8*
+// CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %[[dest_a_bitcast]], i8* %[[src_a_bitcast]], i32 4, i32 4, i1 false)
+// CHECK-NEXT: %[[dest_this:.*]] = load %struct.Derived2** %[[retval]]
+// CHECK-NEXT: ret %struct.Derived2* %[[dest_this]]
+  int Array[1];
+};