sSize = 16
                         THEN
                              SP ← SP + SRC;
                         ELSE (* StackAddressSize = 64 *)
                              RSP ← RSP + SRC;
                    FI;
         FI;
FI;</pre>
<h2>Flags Affected</h2>
<p>None.</p>
<h2>Protected Mode Exceptions</h2>
<table class="exception-table">
<tr>
<td>#GP(0)</td>
<td>
<p>If the return code or stack segment selector NULL.</p>
<p>If the return instruction pointer is not within the return code segment limit</