tions</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html">N2427</a></td>
      <td class="full" align="center">Clang 3.1</td>
    </tr>
    <tr>
      <td>Strong Compare and Exchange</td>
      <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2748.html">N2748</a></td>
      <td class="full" align="center">Clang 3.1 <a href="#n2748">(3)</a></td>
    </tr>
    <tr>
      <td>Bidirectional Fences</td>
      <td><a href="http://www.open-std.org/jtc1/s