XOR
Logical Exclusive OR
| Instruction | Description |
|---|---|
XOR r/m8, imm8 | r/m8 XOR imm8 |
XOR r/m16, imm16 | r/m16 XOR imm16 |
XOR r/m32, imm32 | r/m32 XOR imm32 |
XOR r/m64, imm32 | r/m64 XOR imm32 (sign-extended) |
XOR r/m16, imm8 | r/m16 XOR imm8 (sign-extended) |
XOR r/m32, imm8 | r/m32 XOR imm8 (sign-extended) |
XOR r/m64, imm8 | r/m64 XOR imm8 (sign-extended) |
XOR r/m8, r8 | r/m8 XOR r8 |
XOR r/m16, r16 | r/m16 XOR r16 |
XOR r/m32, r32 | r/m32 XOR r32 |
XOR r/m64, r64 | r/m64 XOR r64 |
XOR r8, r/m8 | r8 XOR r/m8 |
XOR r16, r/m16 | r16 XOR r/m16 |
XOR r32, r/m32 | r32 XOR r/m32 |
XOR r64, r/m64 | r64 XOR r/m64 |
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.
In 64-bit mode, 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: first operand
SRC: second operand
DEST = DEST ^ 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.