th>
<th>Instruction</th>
<th>64-Bit Mode</th>
<th>Compat/Leg Mode</th>
<th>Description</th></tr>
<tr>
<td>D9 /5</td>
<td>FLDCW m2byte</td>
<td>Valid</td>
<td>Valid</td>
<td>Load FPU control word from <em>m2byte.</em></td></tr></table>
<h2 id="description">Description<a class="anchor" href="#description">
			¶
		</a></h2>
<p>Loads the 16-bit source operand into the FPU control word. The source operand is a memory location. This instruction is typically used to establish or change the FPU’s mode of operati