CallIC and KeyedCallIC not wrapping this.

src/ia32/stub-cache-ia32.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 2186 matching lines @@
       // Patch the receiver on the stack with the global proxy if
       // necessary.
       if (object->IsGlobalObject()) {
         ASSERT(depth == kInvalidProtoDepth);
         __ mov(edx, FieldOperand(edx, GlobalObject::kGlobalReceiverOffset));
         __ mov(Operand(esp, (argc + 1) * kPointerSize), edx);
       }
       break;
 
     case STRING_CHECK:
-      if (!function->IsBuiltin()) {
-        // Calling non-builtins with a value as receiver requires boxing.
+      if (!function->IsBuiltin() && !function_info->strict_mode()) {
+        // Calling non-strict non-builtins with a value as the receiver
+        // requires boxing.
         __ jmp(&miss);
       } else {
         // Check that the object is a string or a symbol.
         __ CmpObjectType(edx, FIRST_NONSTRING_TYPE, eax);
         __ j(above_equal, &miss, not_taken);
         // Check that the maps starting from the prototype haven't changed.
         GenerateDirectLoadGlobalFunctionPrototype(
             masm(), Context::STRING_FUNCTION_INDEX, eax, &miss);
         CheckPrototypes(JSObject::cast(object->GetPrototype()), eax, holder,
                         ebx, edx, edi, name, &miss);
       }
       break;
 
     case NUMBER_CHECK: {
-      if (!function->IsBuiltin()) {
-        // Calling non-builtins with a value as receiver requires boxing.
+      if (!function->IsBuiltin() && !function_info->strict_mode()) {
+        // Calling non-strict non-builtins with a value as the receiver
+        // requires boxing.
         __ jmp(&miss);
       } else {
         Label fast;
         // Check that the object is a smi or a heap number.
         __ test(edx, Immediate(kSmiTagMask));
         __ j(zero, &fast, taken);
         __ CmpObjectType(edx, HEAP_NUMBER_TYPE, eax);
         __ j(not_equal, &miss, not_taken);
         __ bind(&fast);
         // Check that the maps starting from the prototype haven't changed.
         GenerateDirectLoadGlobalFunctionPrototype(
             masm(), Context::NUMBER_FUNCTION_INDEX, eax, &miss);
         CheckPrototypes(JSObject::cast(object->GetPrototype()), eax, holder,
                         ebx, edx, edi, name, &miss);
       }
       break;
     }
 
     case BOOLEAN_CHECK: {
-      if (!function->IsBuiltin()) {
-        // Calling non-builtins with a value as receiver requires boxing.
+      if (!function->IsBuiltin() && !function_info->strict_mode()) {
+        // Calling non-strict non-builtins with a value as the receiver
+        // requires boxing.
         __ jmp(&miss);
       } else {
         Label fast;
         // Check that the object is a boolean.
         __ cmp(edx, Factory::true_value());
         __ j(equal, &fast, taken);
         __ cmp(edx, Factory::false_value());
         __ j(not_equal, &miss, not_taken);
         __ bind(&fast);
         // Check that the maps starting from the prototype haven't changed.
@@ skipping 1460 matching lines @@
 
   return GetCode(flags);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32