s of the AL register to contain the correct 2-digit, packed BCD result. If a decimal carry is detected, the CF and AF flags are set accordingly.</p>
<p>This instruction executes as described above in compatibility mode and legacy mode. It is not valid in 64-bit mode.</p>
<h2 id="operation">Operation<a class="anchor" href="#operation">
			¶
		</a></h2>
<pre>IF 64-Bit Mode
    THEN
        #UD;
    ELSE
        old_AL ← AL;
        old_CF ← CF;
        CF ← 0;
        IF (((AL AND 0FH) &gt; 9) or AF = 