Use mutable heapnumbers to store doubles in fields.

src/stub-cache.h

 // Copyright 2012 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 94 matching lines @@
                                          Handle<Name> name);
 
   // Computes the right stub matching. Inserts the result in the
   // cache before returning.  This might compile a stub if needed.
   Handle<Code> ComputeLoadNonexistent(Handle<Name> name,
                                       Handle<JSObject> object);
 
   Handle<Code> ComputeLoadField(Handle<Name> name,
                                 Handle<JSObject> object,
                                 Handle<JSObject> holder,
-                                PropertyIndex field_index);
+                                PropertyIndex field_index,
+                                Representation representation);
 
   Handle<Code> ComputeLoadCallback(Handle<Name> name,
                                    Handle<JSObject> object,
                                    Handle<JSObject> holder,
                                    Handle<ExecutableAccessorInfo> callback);
 
   Handle<Code> ComputeLoadViaGetter(Handle<Name> name,
                                     Handle<JSObject> object,
                                     Handle<JSObject> holder,
                                     Handle<JSFunction> getter);
@@ skipping 14 matching lines @@
                                  Handle<JSObject> object,
                                  Handle<GlobalObject> holder,
                                  Handle<JSGlobalPropertyCell> cell,
                                  bool is_dont_delete);
 
   // ---
 
   Handle<Code> ComputeKeyedLoadField(Handle<Name> name,
                                      Handle<JSObject> object,
                                      Handle<JSObject> holder,
-                                     PropertyIndex field_index);
+                                     PropertyIndex field_index,
+                                     Representation representation);
 
   Handle<Code> ComputeKeyedLoadCallback(
       Handle<Name> name,
       Handle<JSObject> object,
       Handle<JSObject> holder,
       Handle<ExecutableAccessorInfo> callback);
 
   Handle<Code> ComputeKeyedLoadConstant(Handle<Name> name,
                                         Handle<JSObject> object,
                                         Handle<JSObject> holder,
@@ skipping 338 matching lines @@
   // where the generated code is not allowed to have references to
   // objects from a context.
   static void GenerateDirectLoadGlobalFunctionPrototype(MacroAssembler* masm,
                                                         int index,
                                                         Register prototype,
                                                         Label* miss);
 
   static void GenerateFastPropertyLoad(MacroAssembler* masm,
                                        Register dst,
                                        Register src,
-                                       Handle<JSObject> holder,
-                                       PropertyIndex index);
-  static void DoGenerateFastPropertyLoad(MacroAssembler* masm,
-                                         Register dst,
-                                         Register src,
-                                         bool inobject,
-                                         int index);
+                                       bool inobject,
+                                       int index,
+                                       Representation representation);
 
   static void GenerateLoadArrayLength(MacroAssembler* masm,
                                       Register receiver,
                                       Register scratch,
                                       Label* miss_label);
 
   static void GenerateLoadStringLength(MacroAssembler* masm,
                                        Register receiver,
                                        Register scratch1,
                                        Register scratch2,
@@ skipping 10 matching lines @@
                                Handle<JSObject> object,
                                LookupResult* lookup,
                                Handle<Map> transition,
                                Handle<Name> name,
                                Register receiver_reg,
                                Register name_reg,
                                Register value_reg,
                                Register scratch1,
                                Register scratch2,
                                Label* miss_label,
-                               Label* miss_restore_name);
+                               Label* miss_restore_name,
+                               Label* slow);
 
   void GenerateStoreField(MacroAssembler* masm,
                           Handle<JSObject> object,
                           LookupResult* lookup,
                           Register receiver_reg,
                           Register name_reg,
                           Register value_reg,
                           Register scratch1,
                           Register scratch2,
                           Label* miss_label);
 
   static Builtins::Name MissBuiltin(Code::Kind kind) {
     switch (kind) {
       case Code::LOAD_IC: return Builtins::kLoadIC_Miss;
       case Code::STORE_IC: return Builtins::kStoreIC_Miss;
       case Code::KEYED_LOAD_IC: return Builtins::kKeyedLoadIC_Miss;
       case Code::KEYED_STORE_IC: return Builtins::kKeyedStoreIC_Miss;
       default: UNREACHABLE();
     }
     return Builtins::kLoadIC_Miss;
   }
+  static Builtins::Name SlowBuiltin(Code::Kind kind) {
+    switch (kind) {
+      case Code::STORE_IC: return Builtins::kStoreIC_Slow;
+      case Code::KEYED_STORE_IC: return Builtins::kKeyedStoreIC_Slow;
+      default: UNREACHABLE();
+    }
+    return Builtins::kStoreIC_Slow;
+  }
   static void TailCallBuiltin(MacroAssembler* masm, Builtins::Name name);
 
   // Generates code that verifies that the property holder has not changed
   // (checking maps of objects in the prototype chain for fast and global
   // objects or doing negative lookup for slow objects, ensures that the
   // property cells for global objects are still empty) and checks that the map
   // of the holder has not changed. If necessary the function also generates
   // code for security check in case of global object holders. Helps to make
   // sure that the current IC is still valid.
   //
@@ skipping 58 matching lines @@
 
 class BaseLoadStubCompiler: public StubCompiler {
  public:
   BaseLoadStubCompiler(Isolate* isolate, Register* registers)
       : StubCompiler(isolate), registers_(registers) { }
   virtual ~BaseLoadStubCompiler() { }
 
   Handle<Code> CompileLoadField(Handle<JSObject> object,
                                 Handle<JSObject> holder,
                                 Handle<Name> name,
-                                PropertyIndex index);
+                                PropertyIndex index,
+                                Representation representation);
 
   Handle<Code> CompileLoadCallback(Handle<JSObject> object,
                                    Handle<JSObject> holder,
                                    Handle<Name> name,
                                    Handle<ExecutableAccessorInfo> callback);
 
   Handle<Code> CompileLoadConstant(Handle<JSObject> object,
                                    Handle<JSObject> holder,
                                    Handle<Name> name,
                                    Handle<JSFunction> value);
@@ skipping 31 matching lines @@
                                    Label* success,
                                    Handle<ExecutableAccessorInfo> callback);
   void NonexistentHandlerFrontend(Handle<JSObject> object,
                                   Handle<JSObject> last,
                                   Handle<Name> name,
                                   Label* success,
                                   Handle<GlobalObject> global);
 
   void GenerateLoadField(Register reg,
                          Handle<JSObject> holder,
-                         PropertyIndex index);
+                         PropertyIndex field,
+                         Representation representation);
   void GenerateLoadConstant(Handle<JSFunction> value);
   void GenerateLoadCallback(Register reg,
                             Handle<ExecutableAccessorInfo> callback);
   void GenerateLoadInterceptor(Register holder_reg,
                                Handle<JSObject> object,
                                Handle<JSObject> holder,
                                LookupResult* lookup,
                                Handle<Name> name);
   void GenerateLoadPostInterceptor(Register reg,
                                    Handle<JSObject> interceptor_holder,
@@ skipping 405 matching lines @@
   Handle<JSFunction> constant_function_;
   bool is_simple_api_call_;
   Handle<FunctionTemplateInfo> expected_receiver_type_;
   Handle<CallHandlerInfo> api_call_info_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_STUB_CACHE_H_