XOR -- Logical Exclusive OR

XOR -- Logical Exclusive OR Opcode Instruction Clocks Description 34 ib XOR AL,imm8 2 Exclusive-OR immediate byte to AL 35 iw XOR AX,imm16 2 Exclusive-OR immediate word to AX 35 id XOR EAX,imm32 2 Exclusive-OR immediate dword to EAX 80 /6 ib XOR r/m8,imm8 2/7 Exclusive-OR immediate byte to r/m byte 81 /6 iw XOR r/m16,imm16 2/7 Exclusive-OR immediate word to r/m word 81 /6 id XOR r/m32,imm32 2/7 Exclusive-OR immediate dword to r/m dword 83 /6 ib XOR r/m16,imm8 2/7 XOR sign-extended immediate byte with r/m word 83 /6 ib XOR r/m32,imm8 2/7 XOR sign-extended immediate byte with r/m dword 30 /r XOR r/m8,r8 2/6 Exclusive-OR byte register to r/m byte 31 /r XOR r/m16,r16 2/6 Exclusive-OR word register to r/m word 31 /r XOR r/m32,r32 2/6 Exclusive-OR dword register to r/m dword 32 /r XOR r8,r/m8 2/7 Exclusive-OR byte register to r/m byte 33 /r XOR r16,r/m16 2/7 Exclusive-OR word register to r/m word 33 /r XOR r32,r/m32 2/7 Exclusive-OR dword register to r/m dword Operation DEST = LeftSRC XOR RightSRC CF = 0 OF = 0 Description XOR computes the exclusive OR of the two operands. 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. The answer replaces the first operand. Flags Affected CF = 0, OF = 0; SF, ZF, and PF as described in Appendix C; AF is undefined Protected Mode Exceptions #GP(0) if the result is in a nonwritable segment; #GP(0) for an illegal memory operand effective address in the CS, DS, ES, FS, or GS segments; #SS(0) for an illegal address in the SS segment; #PF(fault-code) for a page fault Real Address Mode Exceptions Interrupt 13 if any part of the operand would lie outside of the effective address space from 0 to 0FFFFH Virtual 8086 Mode Exceptions Same exceptions as in Real Address Mode; #PF(fault-code) for a page fault