Truncate rather than round to nearest when performing float-to-integer...

src/stub-cache.h

 // 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 149 matching lines @@
 
   MUST_USE_RESULT static MaybeObject* ComputeKeyedStoreField(
       String* name,
       JSObject* receiver,
       int field_index,
       Map* transition = NULL);
 
   MUST_USE_RESULT static MaybeObject* ComputeKeyedStoreSpecialized(
       JSObject* receiver);
 
+  MUST_USE_RESULT static MaybeObject* ComputeKeyedLoadOrStoreExternalArray(
+      JSObject* receiver,
+      bool is_store);
+
   // ---
 
   MUST_USE_RESULT static MaybeObject* ComputeCallField(int argc,
                                                        InLoopFlag in_loop,
                                                        Code::Kind,
                                                        String* name,
                                                        Object* object,
                                                        JSObject* holder,
                                                        int index);
 
@@ skipping 606 matching lines @@
   // Determines whether the given function can be called using the
   // fast api call builtin.
   void AnalyzePossibleApiFunction(JSFunction* function);
 
   JSFunction* constant_function_;
   bool is_simple_api_call_;
   FunctionTemplateInfo* expected_receiver_type_;
   CallHandlerInfo* api_call_info_;
 };
 
+class ExternalArrayStubCompiler: public StubCompiler {
+ public:
+  explicit ExternalArrayStubCompiler() {}
+
+  MUST_USE_RESULT MaybeObject* CompileKeyedLoadStub(
+      ExternalArrayType array_type, Code::Flags flags);
+
+  MUST_USE_RESULT MaybeObject* CompileKeyedStoreStub(
+      ExternalArrayType array_type, Code::Flags flags);
+
+ private:
+  MaybeObject* GetCode(Code::Flags flags);
+};
+
 } }  // namespace v8::internal
 
 #endif  // V8_STUB_CACHE_H_