Index: cfe/trunk/include/clang/Serialization/ASTBitCodes.h
===================================================================
--- cfe/trunk/include/clang/Serialization/ASTBitCodes.h
+++ cfe/trunk/include/clang/Serialization/ASTBitCodes.h
@@ -927,7 +927,9 @@
       /// \brief An ObjCTypeParamType record.
       TYPE_OBJC_TYPE_PARAM       = 44,
       /// \brief A DeducedTemplateSpecializationType record.
-      TYPE_DEDUCED_TEMPLATE_SPECIALIZATION = 45
+      TYPE_DEDUCED_TEMPLATE_SPECIALIZATION = 45,
+      /// \brief A DependentSizedExtVectorType record.
+      TYPE_DEPENDENT_SIZED_EXT_VECTOR = 46
     };
 
     /// \brief The type IDs for special types constructed by semantic
Index: cfe/trunk/lib/Serialization/ASTReader.cpp
===================================================================
--- cfe/trunk/lib/Serialization/ASTReader.cpp
+++ cfe/trunk/lib/Serialization/ASTReader.cpp
@@ -6073,6 +6073,17 @@
     return Context.getPipeType(ElementType, ReadOnly);
   }
 
+  case TYPE_DEPENDENT_SIZED_EXT_VECTOR: {
+    unsigned Idx = 0;
+
+    // DependentSizedExtVectorType
+    QualType ElementType = readType(*Loc.F, Record, Idx);
+    Expr *SizeExpr = ReadExpr(*Loc.F);
+    SourceLocation AttrLoc = ReadSourceLocation(*Loc.F, Record, Idx);
+
+    return Context.getDependentSizedExtVectorType(ElementType, SizeExpr,
+                                                  AttrLoc);
+  }
   }
   llvm_unreachable("Invalid TypeCode!");
 }
Index: cfe/trunk/lib/Serialization/ASTWriter.cpp
===================================================================
--- cfe/trunk/lib/Serialization/ASTWriter.cpp
+++ cfe/trunk/lib/Serialization/ASTWriter.cpp
@@ -426,8 +426,10 @@
 void
 ASTTypeWriter::VisitDependentSizedExtVectorType(
                                         const DependentSizedExtVectorType *T) {
-  // FIXME: Serialize this type (C++ only)
-  llvm_unreachable("Cannot serialize dependent sized extended vector types");
+  Record.AddTypeRef(T->getElementType());
+  Record.AddStmt(T->getSizeExpr());
+  Record.AddSourceLocation(T->getAttributeLoc());
+  Code = TYPE_DEPENDENT_SIZED_EXT_VECTOR;
 }
 
 void
Index: cfe/trunk/test/PCH/cxx-dependent-sized-ext-vector.cpp
===================================================================
--- cfe/trunk/test/PCH/cxx-dependent-sized-ext-vector.cpp
+++ cfe/trunk/test/PCH/cxx-dependent-sized-ext-vector.cpp
@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 -std=c++11 -emit-pch %s -o %t
+// RUN: %clang_cc1 -std=c++11 -include-pch %t -verify %s
+
+#ifndef HEADER_INCLUDED
+
+#define HEADER_INCLUDED
+
+template<typename T, int N>
+using vec = T __attribute__((ext_vector_type(N)));
+
+#else
+
+void test() {
+  vec<float, 2> a;  // expected-error@-5 {{zero vector size}}
+  vec<float, 0> b; // expected-note {{in instantiation of template type alias 'vec' requested here}}
+}
+
+#endif