Reduced the code sequence for testing for object type....

src/builtins-ia32.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 59 matching lines @@
   if (FLAG_inline_new) {
     Label undo_allocation;
     ExternalReference debug_step_in_fp =
         ExternalReference::debug_step_in_fp_address();
     __ cmp(Operand::StaticVariable(debug_step_in_fp), Immediate(0));
     __ j(not_equal, &rt_call);
     // Check that function is not a Smi.
     __ test(edi, Immediate(kSmiTagMask));
     __ j(zero, &rt_call);
     // Check that function is a JSFunction
-    __ mov(eax, FieldOperand(edi, JSFunction::kMapOffset));
-    __ movzx_b(eax, FieldOperand(eax, Map::kInstanceTypeOffset));
-    __ cmp(eax, JS_FUNCTION_TYPE);
+    __ CmpObjectType(edi, JS_FUNCTION_TYPE, eax);
     __ j(not_equal, &rt_call);
 
     // Verified that the constructor is a JSFunction.
     // Load the initial map and verify that it is in fact a map.
     // edi: constructor
     __ mov(eax, FieldOperand(edi, JSFunction::kPrototypeOrInitialMapOffset));
     // Will both indicate a NULL and a Smi
     __ test(eax, Immediate(kSmiTagMask));
     __ j(zero, &rt_call);
     // edi: constructor
     // eax: initial map (if proven valid below)
-    __ mov(ebx, FieldOperand(eax, JSFunction::kMapOffset));
-    __ movzx_b(ebx, FieldOperand(ebx, Map::kInstanceTypeOffset));
-    __ cmp(ebx, MAP_TYPE);
+    __ CmpObjectType(eax, MAP_TYPE, ebx);
     __ j(not_equal, &rt_call);
 
     // Check that the constructor is not constructing a JSFunction (see comments
     // in Runtime_NewObject in runtime.cc). In which case the initial map's
     // instance type would be JS_FUNCTION_TYPE.
     // edi: constructor
     // eax: initial map
-    __ movzx_b(ebx, FieldOperand(eax, Map::kInstanceTypeOffset));
-    __ cmp(ebx, JS_FUNCTION_TYPE);
+    __ CmpInstanceType(eax, JS_FUNCTION_TYPE);
     __ j(equal, &rt_call);
 
     // Now allocate the JSObject on the heap.
     // edi: constructor
     // eax: initial map
     __ movzx_b(edi, FieldOperand(eax, Map::kInstanceSizeOffset));
     __ shl(edi, kPointerSizeLog2);
     // Make sure that the maximum heap object size will never cause us
     // problem here, because it is always greater than the maximum
     // instance size that can be represented in a byte.
@@ skipping 268 matching lines @@
     __ inc(eax);
     __ bind(&done);
   }
 
   // 2. Get the function to call from the stack.
   { Label done, non_function, function;
     // +1 ~ return address.
     __ mov(edi, Operand(esp, eax, times_4, +1 * kPointerSize));
     __ test(edi, Immediate(kSmiTagMask));
     __ j(zero, &non_function, not_taken);
-    __ mov(ecx, FieldOperand(edi, HeapObject::kMapOffset));  // get the map
-    __ movzx_b(ecx, FieldOperand(ecx, Map::kInstanceTypeOffset));
-    __ cmp(ecx, JS_FUNCTION_TYPE);
+    __ CmpObjectType(edi,JS_FUNCTION_TYPE, ecx);
     __ j(equal, &function, taken);
 
     // Non-function called: Clear the function to force exception.
     __ bind(&non_function);
     __ xor_(edi, Operand(edi));
     __ jmp(&done);
 
     // Function called: Change context eagerly to get the right global object.
     __ bind(&function);
     __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
@@ skipping 347 matching lines @@
   // Dont adapt arguments.
   // -------------------------------------------
   __ bind(&dont_adapt_arguments);
   __ jmp(Operand(edx));
 }
 
 
 #undef __
 
 } }  // namespace v8::internal