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AMD64 Technology 24594 Rev. 3.10 February 2005ExceptionGeneral protection,#GPRealVirtual8086 Protected Cause of ExceptionX X XA memory address exceeded a data segment limit or was non-canonical.X A null data segment was used to reference memory.Page fault, #PF X X A page fault resulted from the execution of the instruction.292 XLATx
24594 Rev. 3.10 February 2005 AMD64 TechnologyXORLogical Exclusive ORPerforms a bitwise exclusive OR operation on both operands and stores the result inthe first operand location. The first operand can be a register or memory location. Thesecond operand can be an immediate value, a register, or a memory location. XOR-inga register with itself clears the register.The forms of the XOR instruction that write to memory support the LOCK prefix. Fordetails about the LOCK prefix, see “Lock Prefix” on page 10.The instruction performs the following operation for each bit:X Y X XOR Y0 0 00 1 11 0 11 1 0Mnemonic Opcode DescriptionXOR AL, imm8XOR AX, imm16XOR EAX, imm32XOR RAX, imm32XOR reg/mem8, imm8XOR reg/mem16, imm1634 ib35 iw35 id35 id80 /6 ib81 /6 iwXOR the contents of AL with an immediate 8-bit operand andstore the result in AL.XOR the contents of AX with an immediate 16-bit operand andstore the result in AX.XOR the contents of EAX with an immediate 32-bit operand andstore the result in EAX.XOR the contents of RAX with a sign-extended immediate 32-bitoperand and store the result in RAX.XOR the contents of an 8-bit destination register or memoryoperand with an 8-bit immediate value and store the result in thedestination.XOR the contents of a 16-bit destination register or memoryoperand with a 16-bit immediate value and store the result in thedestination.XOR 293
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