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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>80386 Programmer's Reference Manual -- Opcode AAA</TITLE></HEAD><BODY><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="XLAT.htm"> XLAT/XLATB Table Look-up Translation</A><P><HR><P><H1>XOR -- Logical Exclusive OR</H1><PRE>Opcode Instruction Clocks Description34 ib XOR AL,imm8 2 Exclusive-OR immediate byte to AL35 iw XOR AX,imm16 2 Exclusive-OR immediate word to AX35 id XOR EAX,imm32 2 Exclusive-OR immediate dword to EAX80 /6 ib XOR r/m8,imm8 2/7 Exclusive-OR immediate byte to r/m byte81 /6 iw XOR r/m16,imm16 2/7 Exclusive-OR immediate word to r/m word81 /6 id XOR r/m32,imm32 2/7 Exclusive-OR immediate dword to r/m dword83 /6 ib XOR r/m16,imm8 2/7 XOR sign-extended immediate byte with r/m word83 /6 ib XOR r/m32,imm8 2/7 XOR sign-extended immediate byte with r/m dword30 /r XOR r/m8,r8 2/6 Exclusive-OR byte register to r/m byte31 /r XOR r/m16,r16 2/6 Exclusive-OR word register to r/m word31 /r XOR r/m32,r32 2/6 Exclusive-OR dword register to r/m dword32 /r XOR r8,r/m8 2/7 Exclusive-OR byte register to r/m byte33 /r XOR r16,r/m16 2/7 Exclusive-OR word register to r/m word33 /r XOR r32,r/m32 2/7 Exclusive-OR dword register to r/m dword</PRE><H2>Operation</H2><PRE>DEST := LeftSRC XOR RightSRCCF := 0OF := 0</PRE><H2>Description</H2>XOR computes the exclusive OR of the two operands. Each bit of the resultis 1 if the corresponding bits of the operands are different; each bit is 0if the corresponding bits are the same. The answer replaces the firstoperand.<H2>Flags Affected</H2>CF := 0, OF := 0; SF, ZF, and PF as described in <A HREF="appc.htm">Appendix C</A>; AF is undefined<H2>Protected Mode Exceptions</H2>#GP(0) if the result is in a nonwritable segment; #GP(0) for an illegalmemory 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 pagefault<H2>Real Address Mode Exceptions</H2>Interrupt 13 if any part of the operand would lie outside of the effectiveaddress space from 0 to 0FFFFH<H2>Virtual 8086 Mode Exceptions</H2>Same exceptions as in Real Address Mode; #PF(fault-code) for a pagefault<P><HR><P><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="XLAT.htm"> XLAT/XLATB Table Look-up Translation</A>⌨️ 快捷键说明
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