XOR Exclusive Or

Flags affected:

        O D I T S Z A P C  OF: Overflow flag  TF: Trap flag AF: Aux carry
        F F F F F F F F F  DF: Direction flag SF: Sign flag PF: Parity flag
        *       * * * * *  IF: Interrupt flag ZF: Zero flag CF: Carry flag

Legal forms:

        XOR r8,r8
        XOR m8,r8
        XOR r8,m8
        XOR r16,r16
        XOR m16,r16
        XOR r16,m16
        XOR r32,r32    386+
        XOR m32,r32    386+
        XOR r32,m32    386+
        XOR r8,i8
        XOR m8,i8
        XOR r16,i16
        XOR m16,i16
        XOR r32,i32    386+
        XOR m32,i32    386+
        XOR AL,i8
        XOR AX,i16
        XOR EAX,i32    386+

Examples:

        XOR BX,DI
        XOR AX,0FFFFH           ;Uses single-byte opcode
        XOR AL,42H              ;Uses single-byte opcode
        XOR EBX,DWORD [EDI]
        XOR WORD [ES:BX],0B800H
        XOR WORD [BP+SI],DX

Notes:

XOR performs the exclusive OR logical operation between its two operands. Once the operation is complete, the result replaces the destination operand. XOR is performed on a bit-by-bit basis, such that bit 0 of the source is XORed with bit 0 of the destination, bit 1 of the source is XORed with bit 1 of the destination, and so on. The XOR operation yields a 1 if the operands are different, and a 0 if the operands are the same. Note that the operation makes the Auxiliary carry flag undefined. CF and OF are cleared to 0, and the other affected flags are set according to the operation's results.

        r8 = AL AH BL BH CL CH DL DH        r16 = AX BX CX DX BP SP SI DI
        sr = CS DS SS ES FS GS              r32 = EAX EBX ECX EDX EBP ESP ESI EDI
        m8 = 8-bit memory data              m16 = 16-bit memory data
        m32 = 32-bit memory data            i8 = 8-bit immediate data
        i16 = 16-bit immediate data         i32 = 32-bit immediate data
        d8 = 8-bit signed displacement      d16 = 16-bit signed displacement
        d32 = 32-bit unsigned displacement