Add a fast case to Array.join when all the elements and the separator are fla...

src/x64/codegen-x64.cc

 // Copyright 2010 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 7199 matching lines @@
 
   Result number = allocator()->Allocate();
   ASSERT(number.is_valid());
   __ movl(number.reg(), FieldOperand(string.reg(), String::kHashFieldOffset));
   __ IndexFromHash(number.reg(), number.reg());
   string.Unuse();
   frame_->Push(&number);
 }
 
 
+void CodeGenerator::GenerateFastAsciiArrayJoin(ZoneList<Expression*>* args) {
+  frame_->Push(Factory::undefined_value());
+}
+
+
 void CodeGenerator::VisitCallRuntime(CallRuntime* node) {
   if (CheckForInlineRuntimeCall(node)) {
     return;
   }
 
   ZoneList<Expression*>* args = node->arguments();
   Comment cmnt(masm_, "[ CallRuntime");
   Runtime::Function* function = node->function();
 
   if (function == NULL) {
@@ skipping 1637 matching lines @@
 #undef __
 
 void RecordWriteStub::Generate(MacroAssembler* masm) {
   masm->RecordWriteHelper(object_, addr_, scratch_);
   masm->ret(0);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64