t do not support the XRELEASE hint, the presence of the F3H prefix behaves the same way as in prior hardware, according to</p>
<ul>
<li>REP/REPE/REPZ semantics for string instructions,</li>
<li>Serve as SIMD prefix for legacy SIMD instructions operating on XMM register</li>
<li>Cause #UD if prepending the VEX prefix.</li>
<li>Undefined for non-string instructions or other situations.</li></ul>
<h2 id="operation">Operation<a class="anchor" href="#operation">
			¶
		</a></h2>
<h3 id="xacquire">XACQUIRE<a cla