3-718
INSTRUCTION SET REFERENCE
XOR—Logical Exclusive OR
Description
This instruction performs a bitwise exclusive OR (XOR) 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 instruc-
tion.) Each bit of the result is 1 if the corresponding bits of the operands are different; each bit
is 0 if the corresponding bits are the same.
Operation
DEST
<
DEST XOR 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.
Opcode
Instruction
Description
34 ib
XOR AL,imm8
AL XOR imm8
35 iw
XOR AX,imm16
AX XOR imm16
35 id
XOR EAX,imm32
EAX XOR imm32
80 /6 ib
XOR r/m8,imm8
r/m8 XOR imm8
81 /6 iw
XOR r/m16,imm16r/m16 XOR imm16
81 /6 id
XOR r/m32,imm32r/m32 XOR imm32
83 /6 ib
XOR r/m16,imm8
r/m16 XOR imm8 (sign-extended)
83 /6 ib
XOR r/m32,imm8
r/m32 XOR imm8 (sign-extended)
30 /r
XOR r/m8,r8
r/m8 XOR r8
31 /r
XOR r/m16,r16
r/m16 XOR r16
31 /r
XOR r/m32,r32
r/m32 XOR r32
32 /r
XOR r8,r/m8
r8 XOR r/m8
33 /r
XOR r16,r/m16
r8 XOR r/m8
33 /r
XOR r32,r/m32
r8 XOR r/m8
