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AMD64 Technology 24594 Rev. 3.10 February 2005ExceptionsException RealVirtual8086 Protected Cause of ExceptionInvalid opcode, #UD X X X The CMOVcc instruction is not supported, as indicated by EDX bit 15of CPUID standard function 1 or extended function 8000_0001h.Stack, #SS X X X A memory address exceeded the stack segment limit or was noncanonical.General protection,#GPX 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.Alignment check, #AC X X An unaligned memory reference was performed while alignmentchecking was enabled.106 CMOVcc
24594 Rev. 3.10 February 2005 AMD64 TechnologyCMPCompareCompares the contents of a register or memory location (first operand) with animmediate value or the contents of a register or memory location (second operand),and sets or clears the status flags in the rFLAGS register to reflect the results. Toperform the comparison, the instruction subtracts the second operand from the firstoperand and sets the status flags in the same manner as the SUB instruction, but doesnot alter the first operand. If the second operand is an immediate value, theinstruction sign-extends the value to the length of the first operand.Use the CMP instruction to set the condition codes for a subsequent conditional jump(Jcc), conditional move (CMOVcc), or conditional SETcc instruction. Appendix E,“Instruction Effects on RFLAGS,” shows how instructions affect the rFLAGS statusflags..Mnemonic Opcode DescriptionCMP AL, imm8CMP AX, imm16CMP EAX, imm32CMP RAX, imm32CMP reg/mem8, imm8CMP reg/mem16, imm16CMP reg/mem32, imm32CMP reg/mem64, imm32CMP reg/mem16, imm8CMP reg/mem32, imm83C ib3D iw3D id3D id80 /7 ib81 /7 iw81 /7 id81 /7 id83 /7 ib83 /7 ibCompare an 8-bit immediate value with the contents of the ALregister.Compare a 16-bit immediate value with the contents of the AXregister.Compare a 32-bit immediate value with the contents of the EAXregister.Compare a 32-bit immediate value with the contents of the RAXregister.Compare an 8-bit immediate value with the contents of an 8-bitregister or memory operand.Compare a 16-bit immediate value with the contents of a 16-bitregister or memory operand.Compare a 32-bit immediate value with the contents of a 32-bitregister or memory operand.Compare a 32-bit signed immediate value with the contents of a64-bit register or memory operand.Compare an 8-bit signed immediate value with the contents of a16-bit register or memory operand.Compare an 8-bit signed immediate value with the contents of a32-bit register or memory operand.CMP 107
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