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NOT.htm
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NOT.htm
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<HTML>
<HEAD>
<TITLE>80386 Programmer's Reference Manual -- Opcode NOT</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="NOP.htm"> NOP No Operation</A><BR>
<B>next:</B><A HREF="OR.htm"> OR Logical Inclusive OR</A>
<P>
<HR>
<P>
<H1>NOT -- One's Complement Negation</H1>
<PRE>
Opcode Instruction Clocks Description
F6 /2 NOT r/m8 2/6 Reverse each bit of r/m byte
F7 /2 NOT r/m16 2/6 Reverse each bit of r/m word
F7 /2 NOT r/m32 2/6 Reverse each bit of r/m dword
</PRE>
<H2>Operation</H2>
<PRE>
r/m := NOT r/m;
</PRE>
<H2>Description</H2>
NOT inverts the operand; every 1 becomes a 0, and vice versa.
<H2>Flags Affected</H2>
None
<H2>Protected Mode Exceptions</H2>
#GP(0) if the result 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="NOP.htm"> NOP No Operation</A><BR>
<B>next:</B><A HREF="OR.htm"> OR Logical Inclusive OR</A>
</BODY>