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| <title>CMC—Complement Carry Flag </title></head> |
| <body> |
| <h1>CMC—Complement Carry Flag</h1> |
| <table> |
| <tr> |
| <th>Opcode</th> |
| <th>Instruction</th> |
| <th>Op/En</th> |
| <th>64-bit Mode</th> |
| <th>Compat/Leg Mode</th> |
| <th>Description</th></tr> |
| <tr> |
| <td>F5</td> |
| <td>CMC</td> |
| <td>NP</td> |
| <td>Valid</td> |
| <td>Valid</td> |
| <td>Complement CF flag.</td></tr></table> |
| <h3>Instruction Operand Encoding</h3> |
| <table> |
| <tr> |
| <td>Op/En</td> |
| <td>Operand 1</td> |
| <td>Operand 2</td> |
| <td>Operand 3</td> |
| <td>Operand 4</td></tr> |
| <tr> |
| <td>NP</td> |
| <td>NA</td> |
| <td>NA</td> |
| <td>NA</td> |
| <td>NA</td></tr></table> |
| <h2>Description</h2> |
| <p>Complements the CF flag in the EFLAGS register. CMC operation is the same in non-64-bit modes and 64-bit mode.</p> |
| <h2>Operation</h2> |
| <pre>EFLAGS.CF[bit 0]← NOT EFLAGS.CF[bit 0];</pre> |
| <h2>Flags Affected</h2> |
| <p>The CF flag contains the complement of its original value. The OF, ZF, SF, AF, and PF flags are unaffected.</p> |
| <h2>Exceptions (All Operating Modes)</h2> |
| <p>#UD</p> |
| <p>If the LOCK prefix is used.</p></body></html> |