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INC.htm
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INC.htm
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<HTML>
<HEAD>
<TITLE>80386 Programmer's Reference Manual -- Opcode INC</TITLE>
</HEAD>
<BODY STYLE="width:80ch">
<B>up:</B> <A HREF="c17.htm">
Chapter 17 -- 80386 Instruction Set</A><BR>
<B>prev:</B><A HREF="IN.htm"> IN Input from Port</A><BR>
<B>next:</B><A HREF="INS.htm"> INS/INSB/INSW/INSD Input from Port to String</A>
<P>
<HR>
<P>
<H1>INC -- Increment by 1</H1>
<PRE>
Opcode Instruction Clocks Description
FE /0 INC r/m8 Increment r/m byte by 1
FF /0 INC r/m16 Increment r/m word by 1
FF /0 INC r/m32 Increment r/m dword by 1
40 + rw INC r16 Increment word register by 1
40 + rd INC r32 Increment dword register by 1
</PRE>
<H2>Operation</H2>
<PRE>
DEST := DEST + 1;
</PRE>
<H2>Description</H2>
INC adds 1 to the operand. It does not change the carry flag. To affect
the carry flag, use the
<A HREF="ADD.htm">ADD</A> instruction with a second operand of 1.
<H2>Flags Affected</H2>
OF, SF, ZF, AF, and PF as described in <A HREF="appc.htm">Appendix C</A>
<H2>Protected Mode Exceptions</H2>
#GP(0) if the operand 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
<H2>Real Address Mode Exceptions</H2>
Interrupt 13 if any part of the operand would lie outside of the effective
address 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="IN.htm"> IN Input from Port</A><BR>
<B>next:</B><A HREF="INS.htm"> INS/INSB/INSW/INSD Input from Port to String</A>
</BODY>