title: How to mirror a byte without using other registers?
body: <p>Let's say I have this byte in AL: <code>01100001</code>
  After applying a <strong>mirror</strong> function I want the byte to be <code>10000110</code>.</p>
  
  <p>All ideas that I came up with I have to use other registers, but I am curious if there is a way to mirror a byte without using any other register?</p>