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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>80386 Programmer's Reference Manual -- Opcode OR</TITLE></HEAD><BODY><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="NOT.htm"> NOT One's Complement Negation</A><BR><B>next:</B><A HREF="OUT.htm"> OUT Output to Port</A><P><HR><P><H1>OR -- Logical Inclusive OR</H1><PRE>Opcode Instruction Clocks Description0C ib OR AL,imm8 2 OR immediate byte to AL0D iw OR AX,imm16 2 OR immediate word to AX0D id OR EAX,imm32 2 OR immediate dword to EAX80 /1 ib OR r/m8,imm8 2/7 OR immediate byte to r/m byte81 /1 iw OR r/m16,imm16 2/7 OR immediate word to r/m word81 /1 id OR r/m32,imm32 2/7 OR immediate dword to r/m dword83 /1 ib OR r/m16,imm8 2/7 OR sign-extended immediate byte with r/m word83 /1 ib OR r/m32,imm8 2/7 OR sign-extended immediate byte with r/m dword08 /r OR r/m8,r8 2/6 OR byte register to r/m byte09 /r OR r/m16,r16 2/6 OR word register to r/m word09 /r OR r/m32,r32 2/6 OR dword register to r/m dword0A /r OR r8,r/m8 2/7 OR byte register to r/m byte0B /r OR r16,r/m16 2/7 OR word register to r/m word0B /r OR r32,r/m32 2/7 OR dword register to r/m dword</PRE><H2>Operation</H2><PRE>DEST := DEST OR SRC;CF := 0;OF := 0</PRE><H2>Description</H2>OR computes the inclusive OR of its two operands and places the resultin the first operand. Each bit of the result is 0 if both correspondingbits of the operands are 0; otherwise, each bit is 1.<H2>Flags Affected</H2>OF := 0, CF := 0; SF, ZF, and PF as described in <A HREF="appc.htm">Appendix C</A>; AF isundefined<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 GSsegments; #SS(0) for an illegal address in the SS segment; #PF(fault-code)for a page fault<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="NOT.htm"> NOT One's Complement Negation</A><BR><B>next:</B><A HREF="OUT.htm"> OUT Output to Port</A></BODY>⌨️ 快捷键说明
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