Serendipitously arrange the tags so that String.length() becomes a branch-fre...

src/stub-cache.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 245 matching lines @@
     code = compiler.CompileLoadArrayLength(name);
     if (code->IsFailure()) return code;
     LOG(CodeCreateEvent("KeyedLoadIC", Code::cast(code), name));
     Object* result = receiver->map()->UpdateCodeCache(name, Code::cast(code));
     if (result->IsFailure()) return result;
   }
   return code;
 }
 
 
-Object* StubCache::ComputeKeyedLoadShortStringLength(String* name,
-                                                     String* receiver) {
+Object* StubCache::ComputeKeyedLoadStringLength(String* name,
+                                                String* receiver) {
   Code::Flags flags =
       Code::ComputeMonomorphicFlags(Code::KEYED_LOAD_IC, CALLBACKS);
   Object* code = receiver->map()->FindInCodeCache(name, flags);
   if (code->IsUndefined()) {
     KeyedLoadStubCompiler compiler;
-    code = compiler.CompileLoadShortStringLength(name);
+    code = compiler.CompileLoadStringLength(name);
     if (code->IsFailure()) return code;
     LOG(CodeCreateEvent("KeyedLoadIC", Code::cast(code), name));
     Object* result = receiver->map()->UpdateCodeCache(name, Code::cast(code));
     if (result->IsFailure()) return result;
   }
   return code;
 }
 
 
-Object* StubCache::ComputeKeyedLoadMediumStringLength(String* name,
-                                                      String* receiver) {
-  Code::Flags flags =
-      Code::ComputeMonomorphicFlags(Code::KEYED_LOAD_IC, CALLBACKS);
-  Object* code = receiver->map()->FindInCodeCache(name, flags);
-  if (code->IsUndefined()) {
-    KeyedLoadStubCompiler compiler;
-    code = compiler.CompileLoadMediumStringLength(name);
-    if (code->IsFailure()) return code;
-    LOG(CodeCreateEvent("KeyedLoadIC", Code::cast(code), name));
-    Object* result = receiver->map()->UpdateCodeCache(name, Code::cast(code));
-    if (result->IsFailure()) return result;
-  }
-  return code;
-}
-
-
-Object* StubCache::ComputeKeyedLoadLongStringLength(String* name,
-                                                    String* receiver) {
-  Code::Flags flags =
-      Code::ComputeMonomorphicFlags(Code::KEYED_LOAD_IC, CALLBACKS);
-  Object* code = receiver->map()->FindInCodeCache(name, flags);
-  if (code->IsUndefined()) {
-    KeyedLoadStubCompiler compiler;
-    code = compiler.CompileLoadLongStringLength(name);
-    if (code->IsFailure()) return code;
-    LOG(CodeCreateEvent("KeyedLoadIC", Code::cast(code), name));
-    Object* result = receiver->map()->UpdateCodeCache(name, Code::cast(code));
-    if (result->IsFailure()) return result;
-  }
-  return code;
-}
-
-
 Object* StubCache::ComputeKeyedLoadFunctionPrototype(String* name,
                                                      JSFunction* receiver) {
   Code::Flags flags =
       Code::ComputeMonomorphicFlags(Code::KEYED_LOAD_IC, CALLBACKS);
   Object* code = receiver->map()->FindInCodeCache(name, flags);
   if (code->IsUndefined()) {
     KeyedLoadStubCompiler compiler;
     code = compiler.CompileLoadFunctionPrototype(name);
     if (code->IsFailure()) return code;
     LOG(CodeCreateEvent("KeyedLoadIC", Code::cast(code), name));
@@ skipping 621 matching lines @@
 
 
 Object* CallStubCompiler::GetCode(PropertyType type) {
   int argc = arguments_.immediate();
   Code::Flags flags = Code::ComputeMonomorphicFlags(Code::CALL_IC, type, argc);
   return GetCodeWithFlags(flags);
 }
 
 
 } }  // namespace v8::internal