specified in <em>r64b</em>.</p>
<p>Shift <em>r/m64</em> logically left with count specified in <em>r64b</em>.</p>
<p>Shift <em>r/m64</em> logically right with count specified in<em> r64b</em>.</p></td></tr></table>
<p><strong>NOTES:</strong></p>
<p>1. ModRM:r/m is used to encode the first source operand (second operand) and VEX.vvvv encodes the second source operand (third oper-</p>
<p>and).</p>
<h3>Instruction Operand Encoding</h3>
<table>
<tr>
<td>Op/En</td>
<td>Operand 1</td>
<td>Operand 2</td>
<td>Opera