h>
<th>64-Bit Mode</th>
<th>Compat/Leg Mode</th>
<th>Description</th></tr>
<tr>
<td>D9 F0</td>
<td>F2XM1</td>
<td>Valid</td>
<td>Valid</td>
<td>Replace ST(0) with (2<sup>ST(0)</sup> – 1).</td></tr></table>
<h2 id="description">Description<a class="anchor" href="#description">
			¶
		</a></h2>
<p>Computes the exponential value of 2 to the power of the source operand minus 1. The source operand is located in register ST(0) and the result is also stored in ST(0). The value of the source operand must lie in 