Optimize %ClassOf() on IA-32 and use it instead of the...

src/arm/codegen-arm.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 3162 matching lines @@
                                          &num_args,
                                          &function,
                                          arg_count + 1);
 
   // Discard old TOS value and push r0 on the stack (same as Pop(), push(r0)).
   __ str(r0, frame_->Top());
   ASSERT(frame_->height() == original_height + 1);
 }
 
 
+void CodeGenerator::GenerateClassOf(ZoneList<Expression*>* args) {
+  VirtualFrame::SpilledScope spilled_scope;
+  ASSERT(args->length() == 1);
+  LoadAndSpill(args->at(0));  // Load the object.
+  frame_->CallRuntime(Runtime::kClassOf, 1);
+  frame_->EmitPush(r0);
+}
+
+
 void CodeGenerator::GenerateValueOf(ZoneList<Expression*>* args) {
   VirtualFrame::SpilledScope spilled_scope;
   ASSERT(args->length() == 1);
   JumpTarget leave;
   LoadAndSpill(args->at(0));
   frame_->EmitPop(r0);  // r0 contains object.
   // if (object->IsSmi()) return the object.
   __ tst(r0, Operand(kSmiTagMask));
   leave.Branch(eq);
   // It is a heap object - get map. If (!object->IsJSValue()) return the object.
@@ skipping 2440 matching lines @@
   __ mov(r2, Operand(0));
   __ GetBuiltinEntry(r3, Builtins::CALL_NON_FUNCTION);
   __ Jump(Handle<Code>(Builtins::builtin(Builtins::ArgumentsAdaptorTrampoline)),
           RelocInfo::CODE_TARGET);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal