# AND — Logical And

## Description

Performs a bitwise AND operation on the destination (first) and source (second) operands and stores the result in the destination operand
location. The source operand can be an immediate, a register, or a memory location; the destination operand can be a register or a memory
location. However, two memory operands cannot be used in one instruction. Each bit of the result is set to 1 if both corresponding bits of the
first and second operands are 1; otherwise, it is set to 0.

## Instruction

| Opcode           | Assembly         | Op/En | Modern Mode | Legacy Mode | Description                                                        |
|------------------|------------------|-------|-------------|-------------|--------------------------------------------------------------------|
| 24 ib            | AND AL, imm8     | I     | Valid       | Valid       | AL AND imm8.                                                       |
| 25 iw            | AND AX, imm16    | I     | Valid       | Valid       | AX AND imm16.                                                      |
| 25 id            | AND EAX, imm32   | I     | Valid       | Valid       | EAX AND imm32.                                                     |
| REX.W + 25 id    | AND RAX, imm32   | I     | Valid       | N.E.        | RAX AND imm32 sign-extended to 64-bits.                            |
| 80 /4 ib         | AND r/m8, imm8   | MI    | Valid       | Valid       | r/m8 AND imm8.                                                     |
| REX + 80 /4 ib   | AND r/m8*, imm8  | MI    | Valid       | N.E.        | r/m8 AND imm8.                                                     |
| 81 /4 iw         | AND r/m16, imm16 | MI    | Valid       | Valid       | r/m16 AND imm16.                                                   |
| 81 /4 id         | AND r/m32, imm32 | MI    | Valid       | Valid       | r/m32 AND imm32.                                                   |
| REX.W + 81 /4 id | AND r/m64, imm32 | MI    | Valid       | N.E.        | r/m64 AND imm32 sign extended to 64-bits.                          |
| 83 /4 ib         | AND r/m16, imm8  | MI    | Valid       | Valid       | r/m16 AND imm8 (sign-extended).                                    |
| 83 /4 ib         | AND r/m32, imm8  | MI    | Valid       | Valid       | r/m32 AND imm8 (sign-extended).                                    |
| REX.W + 83 /4 ib | AND r/m64, imm8  | MI    | Valid       | N.E.        | r/m64 AND imm8 (sign-extended).                                    |
| 20 /r            | AND r/m8, r8     | MR    | Valid       | Valid       | r/m8 AND r8.                                                       |
| REX + 20 /r      | AND r/m8*, r8*   | MR    | Valid       | N.E.        | r/m64 AND r8 (sign-extended).                                      |
| 21 /r            | AND r/m16, r16   | MR    | Valid       | Valid       | r/m16 AND r16.                                                     |
| 21 /r            | AND r/m32, r32   | MR    | Valid       | Valid       | r/m32 AND r32.                                                     |
| REX.W + 21 /r    | AND r/m64, r64   | MR    | Valid       | N.E.        | r/m64 AND r32.                                                     |
| 22 /r            | AND r8, r/m8     | RM    | Valid       | Valid       | r8 AND r/m8.                                                       |
| REX + 22 /r      | AND r8*, r/m8*   | RM    | Valid       | N.E.        | r/m64 AND r8 (sign-extended).                                      |
| 23 /r            | AND r16, r/m16   | RM    | Valid       | Valid       | r16 AND r/m16.                                                     |
| 23 /r            | AND r32, r/m32   | RM    | Valid       | Valid       | r32 AND r/m32.                                                     |
| REX.W + 23 /r    | AND r64, r/m64   | RM    | Valid       | N.E.        | r64 AND 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 it 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.