boost shared_ptr move semantics test ASM: static_pointer_cas

; template<class T, class U> shared_ptr<T> static_pointer_cast(shared_ptr<U> const & r)
;   511: {
;   512:     return shared_ptr<T>(r, boost::detail::static_cast_tag());
010412E0  mov         edx,dword ptr [ecx]
010412E2  mov         dword ptr [eax],edx
010412E4  mov         ecx,dword ptr [ecx+4]
010412E7  mov         dword ptr [eax+4],ecx
010412EA  test        ecx,ecx
010412EC  je          boost::static_pointer_cast<CBase,CDerived>+1Ah (10412FAh)  <------ NO JUMP
010412EE  add         ecx,4
010412F1  mov         edx,1
010412F6  lock xadd   dword ptr [ecx],edx  <-------- CALLED
;   513: }
010412FA  ret