## xor - exclusive or

    dest = dest ^ source

The xor instruction ors the source value (second operand) to the destination (either a register or a memory location). The destination can be a 64, 32, 16 or 8 bit register or memory location. The source can be either a register, memory location or an immediate value. You can not use 2 memory addresses.

The operation performs a bitwise xor of the 2 operands. Exclusive or means one of the other but not both. In my description xor is a bit flipper - the 1 bits from the second operand are used to flip the same bits in the first operand. Another easy way to describe xor is "not-equal". Here is an example of a bitwise xor.

         1010010010101011
       ^ 1010101010100111
         ----------------
         0000111000001100

Some examples of using and:

            xor      rax, 0x1000    ; xor rax with 0x1000
                                    ; flips bit 12 of rax
            xor      eax, 0xff00    ; xor eax with 0xff00
                                    ; fills upper half of rax with 0
            xor      dx, ax         ; xor dx and ax, result in dx
                                    ; leaves the rest of rdx alone
            xor      rax, [y]       ; xor rax with 64 bit variable y
            xor      [x], eax       ; xor 32 bit varaible x with eax

### flags: OF CF SF ZF PF