gn-extended result.</td>
</tr>
</tbody>
<tfoot>
<tr>
  <td align="center" colspan="2"><span class="bold"><strong>Semantic statement</strong></span></td>
  <td></td>
</tr>
<tr>
  <td></td>
  <td colspan="2"><code class="code">output = sext(input0);</code></td>
</tr>
</tfoot>
</table>
</div></div>
<p>
Sign-extend the data in input0 and store the result in output. Copy
all the data from input0 into the least significant positions of
output. Fill out any remaining space in the most significant bytes of
output w