diff --git a/test/CodeGen/tbaa-class.cpp b/test/CodeGen/tbaa-class.cpp
new file mode 100644
index 0000000..967ba19
--- /dev/null
+++ b/test/CodeGen/tbaa-class.cpp
@@ -0,0 +1,226 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin -O1 -disable-llvm-optzns %s -emit-llvm -o - | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-apple-darwin -O1 -struct-path-tbaa -disable-llvm-optzns %s -emit-llvm -o - | FileCheck %s -check-prefix=PATH
+// Test TBAA metadata generated by front-end.
+
+typedef unsigned char uint8_t;
+typedef unsigned short uint16_t;
+typedef unsigned int uint32_t;
+typedef unsigned long long uint64_t;
+class StructA
+{
+public:
+   uint16_t f16;
+   uint32_t f32;
+   uint16_t f16_2;
+   uint32_t f32_2;
+};
+class StructB
+{
+public:
+   uint16_t f16;
+   StructA a;
+   uint32_t f32;
+};
+class StructC
+{
+public:
+   uint16_t f16;
+   StructB b;
+   uint32_t f32;
+};
+class StructD
+{
+public:
+   uint16_t f16;
+   StructB b;
+   uint32_t f32;
+   uint8_t f8;
+};
+
+class StructS
+{
+public:
+   uint16_t f16;
+   uint32_t f32;
+};
+class StructS2 : public StructS
+{
+public:
+   uint16_t f16_2;
+   uint32_t f32_2;
+};
+
+uint32_t g(uint32_t *s, StructA *A, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa [[TAG_i32:!.*]]
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa [[TAG_A_f32:!.*]]
+  *s = 1;
+  A->f32 = 4;
+  return *s;
+}
+
+uint32_t g2(uint32_t *s, StructA *A, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i16 4, i16* %{{.*}}, align 2, !tbaa !5
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa [[TAG_i32]]
+// PATH: store i16 4, i16* %{{.*}}, align 2, !tbaa [[TAG_A_f16:!.*]]
+  *s = 1;
+  A->f16 = 4;
+  return *s;
+}
+
+uint32_t g3(StructA *A, StructB *B, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa [[TAG_A_f32]]
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa [[TAG_B_a_f32:!.*]]
+  A->f32 = 1;
+  B->a.f32 = 4;
+  return A->f32;
+}
+
+uint32_t g4(StructA *A, StructB *B, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i16 4, i16* %{{.*}}, align 2, !tbaa !5
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa [[TAG_A_f32]]
+// PATH: store i16 4, i16* %{{.*}}, align 2, !tbaa [[TAG_B_a_f16:!.*]]
+  A->f32 = 1;
+  B->a.f16 = 4;
+  return A->f32;
+}
+
+uint32_t g5(StructA *A, StructB *B, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa [[TAG_A_f32]]
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa [[TAG_B_f32:!.*]]
+  A->f32 = 1;
+  B->f32 = 4;
+  return A->f32;
+}
+
+uint32_t g6(StructA *A, StructB *B, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa [[TAG_A_f32]]
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa [[TAG_B_a_f32_2:!.*]]
+  A->f32 = 1;
+  B->a.f32_2 = 4;
+  return A->f32;
+}
+
+uint32_t g7(StructA *A, StructS *S, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa [[TAG_A_f32]]
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa [[TAG_S_f32:!.*]]
+  A->f32 = 1;
+  S->f32 = 4;
+  return A->f32;
+}
+
+uint32_t g8(StructA *A, StructS *S, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i16 4, i16* %{{.*}}, align 2, !tbaa !5
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa [[TAG_A_f32]]
+// PATH: store i16 4, i16* %{{.*}}, align 2, !tbaa [[TAG_S_f16:!.*]]
+  A->f32 = 1;
+  S->f16 = 4;
+  return A->f32;
+}
+
+uint32_t g9(StructS *S, StructS2 *S2, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa [[TAG_S_f32]]
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa [[TAG_S_f32:!.*]]
+  S->f32 = 1;
+  S2->f32 = 4;
+  return S->f32;
+}
+
+uint32_t g10(StructS *S, StructS2 *S2, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa [[TAG_S_f32]]
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa [[TAG_S2_f32_2:!.*]]
+  S->f32 = 1;
+  S2->f32_2 = 4;
+  return S->f32;
+}
+
+uint32_t g11(StructC *C, StructD *D, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa [[TAG_C_b_a_f32:!.*]]
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa [[TAG_D_b_a_f32:!.*]]
+  C->b.a.f32 = 1;
+  D->b.a.f32 = 4;
+  return C->b.a.f32;
+}
+
+uint32_t g12(StructC *C, StructD *D, uint64_t count) {
+// CHECK: define i32 @{{.*}}(
+// CHECK: store i32 1, i32* %{{.*}}, align 4, !tbaa !4
+// CHECK: store i32 4, i32* %{{.*}}, align 4, !tbaa !4
+// TODO: differentiate the two accesses.
+// PATH: define i32 @{{.*}}(
+// PATH: store i32 1, i32* %{{.*}}, align 4, !tbaa [[TAG_B_a_f32]]
+// PATH: store i32 4, i32* %{{.*}}, align 4, !tbaa [[TAG_B_a_f32]]
+  StructB *b1 = &(C->b);
+  StructB *b2 = &(D->b);
+  // b1, b2 have different context.
+  b1->a.f32 = 1;
+  b2->a.f32 = 4;
+  return b1->a.f32;
+}
+
+// CHECK: !1 = metadata !{metadata !"omnipotent char", metadata !2}
+// CHECK: !2 = metadata !{metadata !"Simple C/C++ TBAA"}
+// CHECK: !4 = metadata !{metadata !"int", metadata !1}
+// CHECK: !5 = metadata !{metadata !"short", metadata !1}
+
+// PATH: [[TYPE_CHAR:!.*]] = metadata !{metadata !"omnipotent char", metadata !3
+// PATH: [[TAG_i32]] = metadata !{metadata [[TYPE_INT:!.*]], metadata [[TYPE_INT]], i64 0}
+// PATH: [[TYPE_INT]] = metadata !{metadata !"int", metadata [[TYPE_CHAR]]
+// PATH: [[TAG_A_f32]] = metadata !{metadata [[TYPE_A:!.*]], metadata [[TYPE_INT]], i64 4}
+// PATH: [[TYPE_A]] = metadata !{metadata !"_ZTS7StructA", metadata [[TYPE_SHORT:!.*]], i64 0, metadata [[TYPE_INT]], i64 4, metadata [[TYPE_SHORT]], i64 8, metadata [[TYPE_INT]], i64 12}
+// PATH: [[TYPE_SHORT:!.*]] = metadata !{metadata !"short", metadata [[TYPE_CHAR]]
+// PATH: [[TAG_A_f16]] = metadata !{metadata [[TYPE_A]], metadata [[TYPE_SHORT]], i64 0}
+// PATH: [[TAG_B_a_f32]] = metadata !{metadata [[TYPE_B:!.*]], metadata [[TYPE_INT]], i64 8}
+// PATH: [[TYPE_B]] = metadata !{metadata !"_ZTS7StructB", metadata [[TYPE_SHORT]], i64 0, metadata [[TYPE_A]], i64 4, metadata [[TYPE_INT]], i64 20}
+// PATH: [[TAG_B_a_f16]] = metadata !{metadata [[TYPE_B]], metadata [[TYPE_SHORT]], i64 4}
+// PATH: [[TAG_B_f32]] = metadata !{metadata [[TYPE_B]], metadata [[TYPE_INT]], i64 20}
+// PATH: [[TAG_B_a_f32_2]] = metadata !{metadata [[TYPE_B]], metadata [[TYPE_INT]], i64 16}
+// PATH: [[TAG_S_f32]] = metadata !{metadata [[TYPE_S:!.*]], metadata [[TYPE_INT]], i64 4}
+// PATH: [[TYPE_S]] = metadata !{metadata !"_ZTS7StructS", metadata [[TYPE_SHORT]], i64 0, metadata [[TYPE_INT]], i64 4}
+// PATH: [[TAG_S_f16]] = metadata !{metadata [[TYPE_S]], metadata [[TYPE_SHORT]], i64 0}
+// PATH: [[TAG_S2_f32_2]] = metadata !{metadata [[TYPE_S2:!.*]], metadata [[TYPE_INT]], i64 12}
+// PATH: [[TYPE_S2]] = metadata !{metadata !"_ZTS8StructS2", metadata [[TYPE_SHORT]], i64 8, metadata [[TYPE_INT]], i64 12}
+// PATH: [[TAG_C_b_a_f32]] = metadata !{metadata [[TYPE_C:!.*]], metadata [[TYPE_INT]], i64 12}
+// PATH: [[TYPE_C]] = metadata !{metadata !"_ZTS7StructC", metadata [[TYPE_SHORT]], i64 0, metadata [[TYPE_B]], i64 4, metadata [[TYPE_INT]], i64 28}
+// PATH: [[TAG_D_b_a_f32]] = metadata !{metadata [[TYPE_D:!.*]], metadata [[TYPE_INT]], i64 12}
+// PATH: [[TYPE_D]] = metadata !{metadata !"_ZTS7StructD", metadata [[TYPE_SHORT]], i64 0, metadata [[TYPE_B]], i64 4, metadata [[TYPE_INT]], i64 28, metadata [[TYPE_CHAR]], i64 32}