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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>80386 Programmer's Reference Manual -- Opcode ADC</TITLE></HEAD><BODY><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="AAS.htm"> AAS ASCII Adjust AL after Subtraction</A><BR><B>next:</B><A HREF="ADD.htm"> ADD Add</A><P><HR><P><H1>ADC -- Add with Carry</H1><PRE>Opcode Instruction Clocks Description14 ib ADC AL,imm8 2 Add with carry immediate byte to AL15 iw ADC AX,imm16 2 Add with carry immediate word to AX15 id ADC EAX,imm32 2 Add with carry immediate dword to EAX80 /2 ib ADC r/m8,imm8 2/7 Add with carry immediate byte to r/m byte81 /2 iw ADC r/m16,imm16 2/7 Add with carry immediate word to r/m word81 /2 id ADC r/m32,imm32 2/7 Add with CF immediate dword to r/m dword83 /2 ib ADC r/m16,imm8 2/7 Add with CF sign-extended immediate byte to r/m word83 /2 ib ADC r/m32,imm8 2/7 Add with CF sign-extended immediate byte into r/m dword10 /r ADC r/m8,r8 2/7 Add with carry byte register to r/m byte11 /r ADC r/m16,r16 2/7 Add with carry word register to r/m word11 /r ADC r/m32,r32 2/7 Add with CF dword register to r/m dword12 /r ADC r8,r/m8 2/6 Add with carry r/m byte to byte register13 /r ADC r16,r/m16 2/6 Add with carry r/m word to word register13 /r ADC r32,r/m32 2/6 Add with CF r/m dword to dword register</PRE><H2>Operation</H2><PRE>DEST := DEST + SRC + CF;</PRE><H2>Description</H2>ADC performs an integer addition of the two operands DEST and SRC and thecarry flag, CF. The result of the addition is assigned to the first operand(DEST), and the flags are set accordingly. ADC is usually executed as partof a multi-byte or multi-word addition operation. When an immediate bytevalue is added to a word or doubleword operand, the immediate value is firstsign-extended to the size of the word or doubleword operand.<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) if 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="AAS.htm"> AAS ASCII Adjust AL after Subtraction</A><BR><B>next:</B><A HREF="ADD.htm"> ADD Add</A></BODY>⌨️ 快捷键说明
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