AND (Logical AND)

Opcodes

Opcode Instruction Op/En 64-bit Mode Compat/Leg 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.

NOTES:

*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.

Instruction Operand Encoding

Op/En Operand 1 Operand 2 Operand 3 Operand 4
RM ModRM:reg (r, w) ModRM:r/m (r) NA NA
MR ModRM:r/m (r, w) ModRM:reg (r) NA NA
MI ModRM:r/m (r, w) imm8 NA NA
I AL/AX/EAX/RAX imm8 NA NA

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.

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.

Operation

DEST ← DEST AND SRC;

Flags Affected

The OF and CF flags are cleared; the SF, ZF, and PF flags are set according to the result. The state of the AF flag is undefined.

Protected Mode Exceptions

#GP(0) If the destination operand points to a non-writable segment. If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit. If the DS, ES, FS, or GS register contains a NULL segment selector.
#SS(0) If a memory operand effective address is outside the SS segment limit.
#PF(fault-code) If a page fault occurs.
#AC(0) If alignment checking is enabled and an unaligned memory reference is made while the current privilege level is 3.
#UD If the LOCK prefix is used but the destination is not a memory operand.

Real-Address Mode Exceptions

#GP If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit.
#SS If a memory operand effective address is outside the SS segment limit.
#UD If the LOCK prefix is used but the destination is not a memory operand.

Virtual-8086 Mode Exceptions

#GP(0) If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit.
#SS(0) If a memory operand effective address is outside the SS segment limit.
#PF(fault-code) If a page fault occurs.
#AC(0) If alignment checking is enabled and an unaligned memory reference is made.
#UD If the LOCK prefix is used but the destination is not a memory operand.

Compatibility Mode Exceptions

Same exceptions as in protected mode.

64-Bit Mode Exceptions

#SS(0) If a memory address referencing the SS segment is in a non-canonical form.
#GP(0) If the memory address is in a non-canonical form.
#PF(fault-code) If a page fault occurs.
#AC(0) If alignment checking is enabled and an unaligned memory reference is made while the current privilege level is 3.
#UD If the LOCK prefix is used but the destination is not a memory operand.