/td></tr>
<tr>
<td>REX + 1A /<em>r</em></td>
<td>SBB<em> r8*, r/m8*</em></td>
<td>RM</td>
<td>Valid</td>
<td>N.E.</td>
<td>Subtract with borrow<em> r/m8</em> from <em>r8.</em></td></tr>
<tr>
<td>1B /<em>r</em></td>
<td>SBB <em>r16, r/m16</em></td>
<td>RM</td>
<td>Valid</td>
<td>Valid</td>
<td>Subtract with borrow<em> r/m16</em> from <em>r16.</em></td></tr>
<tr>
<td>1B /<em>r</em></td>
<td>SBB<em> r32, r/m32</em></td>
<td>RM</td>
<td>Valid</td>
<td>Valid</td>
<td>Subtract with borrow <em>r/m32</em> from <em>