title: How does the BSWAP instruction "speed execution of decimal arithmetic"?
body: <p>The Intel Software Developer's Manual Volume 1, Section 7.3.1.2 states that the <code>BSWAP</code> instruction <em>&quot;speeds execution of decimal arithmetic&quot;</em>. It doesn't explain how this is so, and Google isn't helping either.</p>
  <p>Can someone enlighten me on this?</p>