diff --git a/src/third_party/llvm-project/clang/test/CodeGen/ms-anonymous-struct.c b/src/third_party/llvm-project/clang/test/CodeGen/ms-anonymous-struct.c
new file mode 100644
index 0000000..bf33406
--- /dev/null
+++ b/src/third_party/llvm-project/clang/test/CodeGen/ms-anonymous-struct.c
@@ -0,0 +1,99 @@
+// RUN: %clang_cc1 -fms-extensions -emit-llvm -o - %s | FileCheck %s
+
+// CHECK: %struct.test = type { i32, %struct.nested2, i32 }
+// CHECK: %struct.nested2 = type { i32, %struct.nested1, i32 }
+// CHECK: %struct.nested1 = type { i32, i32 }
+typedef struct nested1 {
+    int a1;
+    int b1;
+} NESTED1;
+
+struct nested2 {
+    int a;
+    NESTED1; 
+    int b;
+};
+
+struct test {
+    int    x;
+    struct nested2; 
+    int    y;
+};
+
+
+void foo()
+{
+  // CHECK: %var = alloca %struct.test, align 4
+  struct test var;
+
+  // CHECK: getelementptr inbounds %struct.test, %struct.test* %var, i32 0, i32 1
+  // CHECK-NEXT: getelementptr inbounds %struct.nested2, %struct.nested2* %{{.*}}, i32 0, i32 0
+  // CHECK-NEXT: load i32, i32* %{{.*}}, align 4
+  var.a;
+
+  // CHECK-NEXT: getelementptr inbounds %struct.test, %struct.test* %var, i32 0, i32 1
+  // CHECK-NEXT: getelementptr inbounds %struct.nested2, %struct.nested2* %{{.*}}, i32 0, i32 2
+  // CHECK-NEXT: load i32, i32* %{{.*}}, align 4
+  var.b;
+
+  // CHECK-NEXT: getelementptr inbounds %struct.test, %struct.test* %var, i32 0, i32 1
+  // CHECK-NEXT: getelementptr inbounds %struct.nested2, %struct.nested2* %{{.*}}, i32 0, i32 1
+  // CHECK-NEXT: getelementptr inbounds %struct.nested1, %struct.nested1* %{{.*}}, i32 0, i32 0
+  // CHECK-NEXT: load i32, i32* %{{.*}}, align 4
+  var.a1;
+
+  // CHECK-NEXT: getelementptr inbounds %struct.test, %struct.test* %{{.*}}var, i32 0, i32 1
+  // CHECK-NEXT: getelementptr inbounds %struct.nested2, %struct.nested2* %{{.*}}, i32 0, i32 1
+  // CHECK-NEXT: getelementptr inbounds %struct.nested1, %struct.nested1* %{{.*}}, i32 0, i32 1
+  // CHECK-NEXT: load i32, i32* %{{.*}}, align 4
+  var.b1;
+
+  // CHECK-NEXT: getelementptr inbounds %struct.test, %struct.test* %var, i32 0, i32 0
+  // CHECK-NEXT: load i32, i32* %{{.*}}, align 4
+  var.x;
+
+  // CHECK-NEXT: getelementptr inbounds %struct.test, %struct.test* %var, i32 0, i32 2
+  // CHECK-NEXT: load i32, i32* %{{.*}}, align 4
+  var.y;
+}
+
+void foo2(struct test* var)
+{
+  // CHECK: alloca %struct.test*, align
+  // CHECK-NEXT: store %struct.test* %var, %struct.test** %{{.*}}, align
+  // CHECK-NEXT: load %struct.test*, %struct.test** %{{.*}}, align
+  // CHECK-NEXT: getelementptr inbounds %struct.test, %struct.test* %{{.*}}, i32 0, i32 1
+  // CHECK-NEXT: getelementptr inbounds %struct.nested2, %struct.nested2* %{{.*}}, i32 0, i32 0
+  // CHECK-NEXT: load i32, i32* %{{.*}}, align 4
+  var->a;
+
+  // CHECK-NEXT: load %struct.test*, %struct.test** %{{.*}}, align
+  // CHECK-NEXT: getelementptr inbounds %struct.test, %struct.test* %{{.*}}, i32 0, i32 1
+  // CHECK-NEXT: getelementptr inbounds %struct.nested2, %struct.nested2* %{{.*}}, i32 0, i32 2
+  // CHECK-NEXT: load i32, i32* %{{.*}}, align 4
+  var->b;
+
+  // CHECK-NEXT: load %struct.test*, %struct.test** %{{.*}}, align
+  // CHECK-NEXT: getelementptr inbounds %struct.test, %struct.test* %{{.*}}, i32 0, i32 1
+  // CHECK-NEXT: getelementptr inbounds %struct.nested2, %struct.nested2* %{{.*}}, i32 0, i32 1
+  // CHECK-NEXT: getelementptr inbounds %struct.nested1, %struct.nested1* %{{.*}}, i32 0, i32 0
+  // CHECK-NEXT: load i32, i32* %{{.*}}, align 4
+  var->a1;
+
+  // CHECK-NEXT: load %struct.test*, %struct.test** %{{.*}}, align
+  // CHECK-NEXT: getelementptr inbounds %struct.test, %struct.test* %{{.*}}, i32 0, i32 1
+  // CHECK-NEXT: getelementptr inbounds %struct.nested2, %struct.nested2* %{{.*}}, i32 0, i32 1
+  // CHECK-NEXT: getelementptr inbounds %struct.nested1, %struct.nested1* %{{.*}}, i32 0, i32 1
+  // CHECK-NEXT: load i32, i32* %{{.*}}, align 4
+  var->b1;
+
+  // CHECK-NEXT: load %struct.test*, %struct.test** %{{.*}}, align
+  // CHECK-NEXT: getelementptr inbounds %struct.test, %struct.test* %{{.*}}, i32 0, i32 0
+  // CHECK-NEXT: load i32, i32* %{{.*}}, align 4
+  var->x;
+
+  // CHECK-NEXT: load %struct.test*, %struct.test** %{{.*}}, align
+  // CHECK-NEXT: getelementptr inbounds %struct.test, %struct.test* %{{.*}}, i32 0, i32 2
+  // CHECK-NEXT: load i32, i32* %{{.*}}, align 4
+  var->y;
+}