its. Using a REX prefix in the form of REX.R permits access to additional registers (R8-R15). Using a REX prefix in the form of REX.W promotes operation to 64 bits. See the summary chart at the beginning of this section for encoding data and limits.</p>
<h2 id="operation">Operation<a class="anchor" href="#operation">
			¶
		</a></h2>
<pre>CF ← Bit(BitBase, BitOffset);
Bit(BitBase, BitOffset) ← 1;
</pre>
<h2 id="flags-affected">Flags Affected<a class="anchor" href="#flags-affected">
			¶
		</a></h2>
<p