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Vol. 2A 3-53
INSTRUCTION SET REFERENCE, A-M
AND—Logical AND
AND—Logical AND
Opcode Instruction 64-Bit
Mode
Comp/Leg
Mode
Description
24 ib AND AL, imm8 Valid Valid AL AND imm8.
25 iw AND AX, imm16 Valid Valid AX AND imm16.
25 id AND EAX, imm32 Valid Valid EAX AND imm32.
REX.W + 25 id AND RAX, imm32 Valid N.E. RAX AND imm32 sign-
extended to 64-bits.
80 /4 ib AND r/m8, imm8 Valid Valid r/m8 AND imm8.
REX + 80 /4 ib AND r/m8
*
, imm8 Valid N.E. r/m64 AND imm8 (sign-
extended).
81 /4 iw AND r/m16, imm16 Valid Valid r/m16 AND imm16.
81 /4 id AND r/m32, imm32 Valid Valid r/m32 AND imm32.
REX.W + 81 /4
id
AND r/m64, imm32 Valid N.E. r/m64 AND imm32 sign
extended to 64-bits.
83 /4 ib AND r/m16, imm8 Valid Valid r/m16 AND imm8 (sign-
extended).
83 /4 ib AND r/m32, imm8 Valid Valid r/m32 AND imm8 (sign-
extended).
REX.W + 83 /4
ib
AND r/m64, imm8 Valid N.E. r/m64 AND imm8 (sign-
extended).
20 /r AND r/m8, r8 Valid Valid r/m8 AND r8.
REX + 20 /r AND r/m8
*
, r8
*
Valid N.E. r/m64 AND r8 (sign-
extended).
21 /r AND r/m16, r16 Valid Valid r/m16 AND r16.
21 /r AND r/m32, r32 Valid Valid r/m32 AND r32.
REX.W + 21 /r AND r/m64, r64 Valid N.E. r/m64 AND r32.
22 /r AND r8, r/m8 Valid Valid r8 AND r/m8.
REX + 22 /r AND r8
*
, r/m8
*
Valid N.E. r/m64 AND r8 (sign-
extended).
23 /r AND r16, r/m16 Valid Valid r16 AND r/m16.
23 /r AND r32, r/m32 Valid Valid r32 AND r/m32.
REX.W + 23 /r AND r64, r/m64 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.