1.8 KiB
Executable File
1.8 KiB
Executable File
NOT — One's Complement Negation
Description
Performs a bitwise NOT operation (each 1 is set to 0, and each 0 is set to 1) on the destination operand and stores the result in the destination operand location. The destination operand can be a register or a memory location.
Instruction
| Opcode | Assembly | Op/En | Modern Mode | Legacy Mode | Description |
|---|---|---|---|---|---|
| F6 /2 | NOT r/m8 | M | Valid | Valid | Reverse each bit of r/m8. |
| REX + F6 /2 | NOT r/m8* | M | Valid | N.E. | Reverse each bit of r/m8. |
| F7 /2 | NOT r/m16 | M | Valid | Valid | Reverse each bit of r/m16. |
| F7 /2 | NOT r/m32 | M | Valid | Valid | Reverse each bit of r/m32. |
| REX.W + F7 /2 | NOT r/m64 | M | Valid | N.E. | Reverse each bit of r/m64. |
- In 64-bit mode, r/m8 can not be encoded to access the following byte registers if a REX prefix is used: AH, BH, CH, DH.
Information
This instruction can be used with a LOCK prefix to allow the instruction to be executed atomically.
In 64-bit mode, the instruction’s default operation size is 32 bits. Using a REX prefix in the form of REX.R permits access to additional registers (R8-R15). Using a REX prefix in the form of REX.W promotes operation to 64 bits. See the summary chart at the beginning of this section for encoding data and limits.