Not true. In fact, modern x86 backends recognize the safe rotation idiom and also translate it to a single ROL instruction: <a href="http:&#x2F;&#x2F;goo.gl&#x2F;NCMEVu" rel="nofollow">http:&#x2F;&#x2F;goo.gl&#x2F;NCMEVu</a> <a href="http:&#x2F;&#x2F;goo.gl&#x2F;9Ytsz2" rel="nofollow">http:&#x2F;&#x2F;goo.gl&#x2F;9Ytsz2</a> <a href="http:&#x2F;&#x2F;goo.gl&#x2F;vbzHNW" rel="nofollow">http:&#x2F;&#x2F;goo.gl&#x2F;vbzHNW</a>