Index: libstdc++-v3/config/os/aix/ctype_inline.h
===================================================================
--- libstdc++-v3/config/os/aix/ctype_inline.h	(revision 169055)
+++ libstdc++-v3/config/os/aix/ctype_inline.h	(working copy)
@@ -39,14 +39,23 @@
   bool
   ctype<char>::
   is(mask __m, char __c) const
-  { return __OBJ_DATA(__lc_ctype)->mask[__c] & __m; }
+  { 
+    if(_M_table)
+      return _M_table[static_cast<unsigned char>(__c)] & __m;
+    else
+      return __OBJ_DATA(__lc_ctype)->mask[__c] & __m;
+  }
 
   const char*
   ctype<char>::
   is(const char* __low, const char* __high, mask* __vec) const
   {
-    while (__low < __high)
-      *__vec++ = __OBJ_DATA(__lc_ctype)->mask[*__low++];
+    if(_M_table)
+      while (__low < __high)
+	*__vec++ = _M_table[static_cast<unsigned char>(*__low++)];
+    else
+      while (__low < __high)
+        *__vec++ = __OBJ_DATA(__lc_ctype)->mask[*__low++];
     return __high;
   }