x86 Instruction Set Reference

# XOR

# Logical Exclusive OR

Opcode Mnemonic 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,imm16 r/m16 XOR imm16.
81 /6 id XOR r/m32,imm32 r/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 r16 XOR r/m16.
33 /r XOR r32,r/m32 r32 XOR r/m32.

# Description

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 instruction.) 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.

This instruction can be used with a LOCK prefix to allow the instruction to be executed atomically.

# Operation

Destination = Destination ^ Source;
1
2

# 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.

Instruction Latency Throughput Execution Unit
CPUID 0F3n/0F2n 0F3n/0F2n 0F2n
XOR 1/0.5 0.5/0.5 ALU

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