CCPoint里一个细节优化问题

Cocos2d-x
#1

cocos2d-x版本：2.2.1


/** Returns point multiplied to a length of 1.    
 * If the point is 0, it returns (1, 0)    
@return CCPoint     
@since v2.1.4     
*/   
inline CCPoint normalize() const {        
   float length = getLength();       
   if(length == 0.) return CCPoint(1.f, 0);        
   return *this / getLength(); // 【标记1】   
 };

【标记1】处，getLength()重复调用了，直接用length不就好了么？