Add binary-op stub variant to handle oddball objects more efficiently.

src/ic.cc

 // Copyright 2006-2009 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 2113 matching lines @@
   set_target(code);
 }
 
 
 const char* TRBinaryOpIC::GetName(TypeInfo type_info) {
   switch (type_info) {
     case UNINITIALIZED: return "Uninitialized";
     case SMI: return "SMI";
     case INT32: return "Int32s";
     case HEAP_NUMBER: return "HeapNumbers";
+    case ODDBALL: return "Oddball";
     case STRING: return "Strings";
     case GENERIC: return "Generic";
     default: return "Invalid";
   }
 }
 
 
 TRBinaryOpIC::State TRBinaryOpIC::ToState(TypeInfo type_info) {
   switch (type_info) {
     case UNINITIALIZED:
       return ::v8::internal::UNINITIALIZED;
     case SMI:
     case INT32:
     case HEAP_NUMBER:
+    case ODDBALL:
     case STRING:
       return MONOMORPHIC;
     case GENERIC:
       return MEGAMORPHIC;
   }
   UNREACHABLE();
   return ::v8::internal::UNINITIALIZED;
 }
 
 
@@ skipping 27 matching lines @@
   if (left_type.IsNumber() && right_type.IsNumber()) {
     return HEAP_NUMBER;
   }
 
   if (left_type.IsString() || right_type.IsString()) {
     // Patching for fast string ADD makes sense even if only one of the
     // arguments is a string.
     return STRING;
   }
 
+  // Check for oddball objects.
+  if (left->IsUndefined() && right->IsNumber()) return ODDBALL;
+  if (left->IsNumber() && right->IsUndefined()) return ODDBALL;
+
   return GENERIC;
 }
 
 
 // defined in code-stubs-<arch>.cc
 // Only needed to remove dependency of ic.cc on code-stubs-<arch>.h.
 Handle<Code> GetTypeRecordingBinaryOpStub(int key,
                                           TRBinaryOpIC::TypeInfo type_info,
                                           TRBinaryOpIC::TypeInfo result_type);
 
@@ skipping 171 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal