d></tr>
<tr>
<td>Unordered</td>
<td>1</td>
<td>1</td>
<td>1</td></tr></table>
<p>These instructions perform an “unordered comparison.” An unordered comparison also checks the class of the numbers being compared (see “FXAM—Examine ModR/M” in this chapter). If either operand is a NaN or is in an undefined format, the condition flags are set to “unordered.”</p>
<p>The sign of zero is ignored, so that –0.0 ← +0.0.</p>
<p>The FICOMP instructions pop the register stack following the comparison. 