Specialized string equality based on representation

src/jsregexp.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 110 matching lines @@
 Handle<String> RegExpImpl::StringToTwoByte(Handle<String> pattern) {
   if (!pattern->IsFlat()) {
     FlattenString(pattern);
   }
   Handle<String> flat_string(pattern->IsConsString() ?
     String::cast(ConsString::cast(*pattern)->first()) :
     *pattern);
   ASSERT(!flat_string->IsConsString());
   ASSERT(flat_string->IsSeqString() || flat_string->IsSlicedString() ||
          flat_string->IsExternalString());
-  if (!flat_string->IsAscii()) {
+  if (!flat_string->IsAsciiRepresentation()) {
     return flat_string;
   }
 
   Handle<String> two_byte_string =
     Factory::NewRawTwoByteString(flat_string->length(), TENURED);
   static StringInputBuffer convert_to_two_byte_buffer;
   convert_to_two_byte_buffer.Reset(*flat_string);
   for (int i = 0; convert_to_two_byte_buffer.has_more(); i++) {
     two_byte_string->Set(i, convert_to_two_byte_buffer.GetNext());
   }
@@ skipping 349 matching lines @@
 }
 
 
 ByteArray* RegExpImpl::JsreInternal(Handle<JSRegExp> re) {
   Object* value = re->data();
   ASSERT(value->IsFixedArray());
   return ByteArray::cast(FixedArray::cast(value)->get(INTERNAL_INDEX));
 }
 
 }}  // namespace v8::internal