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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>80386 Programmer's Reference Manual -- Opcode ADD</TITLE></HEAD><BODY><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="ADC.htm"> ADC Add with Carry</A><BR><B>next:</B><A HREF="AND.htm"> AND Logical AND</A><P><HR><P><H1>ADD -- Add</H1><PRE>Opcode Instruction Clocks Description04 ib ADD AL,imm8 2 Add immediate byte to AL05 iw ADD AX,imm16 2 Add immediate word to AX05 id ADD EAX,imm32 2 Add immediate dword to EAX80 /0 ib ADD r/m8,imm8 2/7 Add immediate byte to r/m byte81 /0 iw ADD r/m16,imm16 2/7 Add immediate word to r/m word81 /0 id ADD r/m32,imm32 2/7 Add immediate dword to r/m dword83 /0 ib ADD r/m16,imm8 2/7 Add sign-extended immediate byte to r/m word83 /0 ib ADD r/m32,imm8 2/7 Add sign-extended immediate byte to r/m dword00 /r ADD r/m8,r8 2/7 Add byte register to r/m byte01 /r ADD r/m16,r16 2/7 Add word register to r/m word01 /r ADD r/m32,r32 2/7 Add dword register to r/m dword02 /r ADD r8,r/m8 2/6 Add r/m byte to byte register03 /r ADD r16,r/m16 2/6 Add r/m word to word register03 /r ADD r32,r/m32 2/6 Add r/m dword to dword register</PRE><H2>Operation</H2><PRE>DEST := DEST + SRC;</PRE><H2>Description</H2>ADD performs an integer addition of the two operands (DEST and SRC). Theresult of the addition is assigned to the first operand (DEST), and theflags are set accordingly.<P>When an immediate byte is added to a word or doubleword operand, theimmediate value is sign-extended to the size of the word or doublewordoperand.<H2>Flags Affected</H2>OF, SF, ZF, AF, CF, and PF as described in <A HREF="appc.htm">Appendix C</A><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 page fault<P><HR><P><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="ADC.htm"> ADC Add with Carry</A><BR><B>next:</B><A HREF="AND.htm"> AND Logical AND</A></BODY>⌨️ 快捷键说明
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