ia32: Fuse map and type checks in call ICs for API functions.

src/top.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 931 matching lines @@
     }
   }
 #endif  // ENABLE_DEBUGGER_SUPPORT
   if (it.done()) return Handle<Context>::null();
   JavaScriptFrame* frame = it.frame();
   Context* context = Context::cast(frame->context());
   return Handle<Context>(context->global_context());
 }
 
 
+bool Top::CanHaveSpecialFunctions(JSObject* object) {
+  return object->IsJSArray();
+}
+
+
 Object* Top::LookupSpecialFunction(JSObject* receiver,
                                    JSObject* prototype,
                                    JSFunction* function) {
-  if (receiver->IsJSArray()) {
+  if (CanHaveSpecialFunctions(receiver)) {
     FixedArray* table = context()->global_context()->special_function_table();
     for (int index = 0; index < table->length(); index +=3) {
       if ((prototype == table->get(index)) &&
           (function == table->get(index+1))) {
         return table->get(index+2);
       }
     }
   }
   return Heap::undefined_value();
 }
@@ skipping 16 matching lines @@
   Top::break_access_->Lock();
 }
 
 
 ExecutionAccess::~ExecutionAccess() {
   Top::break_access_->Unlock();
 }
 
 
 } }  // namespace v8::internal