diff --git a/clang/include/clang/Basic/Attr.td b/clang/include/clang/Basic/Attr.td
--- a/clang/include/clang/Basic/Attr.td
+++ b/clang/include/clang/Basic/Attr.td
@@ -3080,22 +3080,22 @@
 }
 
 def Ptr32 : TypeAttr {
-  let Spellings = [Keyword<"__ptr32">];
+  let Spellings = [Keyword<"__ptr32">, Clang<"ptr32">];
   let Documentation = [Ptr32Docs];
 }
 
 def Ptr64 : TypeAttr {
-  let Spellings = [Keyword<"__ptr64">];
+  let Spellings = [Keyword<"__ptr64">, Clang<"ptr64">];
   let Documentation = [Ptr64Docs];
 }
 
 def SPtr : TypeAttr {
-  let Spellings = [Keyword<"__sptr">];
+  let Spellings = [Keyword<"__sptr">, Clang<"sptr">];
   let Documentation = [SPtrDocs];
 }
 
 def UPtr : TypeAttr {
-  let Spellings = [Keyword<"__uptr">];
+  let Spellings = [Keyword<"__uptr">, Clang<"uptr">];
   let Documentation = [UPtrDocs];
 }