Index: include/clang/Basic/Builtins.def
===================================================================
--- include/clang/Basic/Builtins.def	(revision 158041)
+++ include/clang/Basic/Builtins.def	(working copy)
@@ -33,7 +33,8 @@
 //  H -> SEL
 //  a -> __builtin_va_list
 //  A -> "reference" to __builtin_va_list
-//  V -> Vector, following num elements and a base type.
+//  V -> Vector, followed by the number of elements and the base type.
+//  E -> ext_vector, followed by the number of elements and the base type.
 //  X -> _Complex, followed by the base type.
 //  Y -> ptrdiff_t
 //  P -> FILE
Index: lib/AST/ASTContext.cpp
===================================================================
--- lib/AST/ASTContext.cpp	(revision 158041)
+++ lib/AST/ASTContext.cpp	(working copy)
@@ -6414,6 +6414,19 @@
                                  VectorType::GenericVector);
     break;
   }
+  case 'E': {
+    char *End;
+    
+    unsigned NumElements = strtoul(Str, &End, 10);
+    assert(End != Str && "Missing vector size");
+    
+    Str = End;
+    
+    QualType ElementType = DecodeTypeFromStr(Str, Context, Error, RequiresICE,
+                                             false);
+    Type = Context.getExtVectorType(ElementType, NumElements);
+    break;    
+  }
   case 'X': {
     QualType ElementType = DecodeTypeFromStr(Str, Context, Error, RequiresICE,
                                              false);