i386/i386.reference/NOT.htm

   1 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
   2 <HTML>
   3 <HEAD>
   4 <TITLE>80386 Programmer's Reference Manual -- Opcode NOT</TITLE>
   5 </HEAD>
   6 <BODY>
   7 <B>up:</B> <A HREF="c17.htm">
   8 Chapter 17 -- 80386 Instruction Set</A><BR>
   9 <B>prev:</B><A HREF="NOP.htm"> NOP No Operation</A><BR>
  10 <B>next:</B><A HREF="OR.htm"> OR Logical Inclusive OR</A>
  11 <P>
  12 <HR>
  13 <P>
  14 <H1>NOT -- One's Complement Negation</H1>
  15
  16 <PRE>
  17 Opcode    Instruction   Clocks    Description
  18
  19 F6   /2   NOT r/m8       2/6      Reverse each bit of r/m byte
  20 F7   /2   NOT r/m16      2/6      Reverse each bit of r/m word
  21 F7   /2   NOT r/m32      2/6      Reverse each bit of r/m dword
  22 </PRE>
  23
  24
  25 <H2>Operation</H2>
  26
  27 <PRE>
  28 r/m := NOT r/m;
  29 </PRE>
  30
  31 <H2>Description</H2>
  32
  33 NOT inverts the operand; every 1 becomes a 0, and vice versa.
  34
  35 <H2>Flags Affected</H2>
  36
  37 None
  38
  39 <H2>Protected Mode Exceptions</H2>
  40
  41 #GP(0) if the result is in a nonwritable segment; #GP(0) for an illegal
  42 memory operand effective address in the CS, DS, ES, FS, or GS
  43 segments; #SS(0) for an illegal address in the SS segment; #PF(fault-code)
  44 for a page fault
  45
  46 <H2>Real Address Mode Exceptions</H2>
  47
  48 Interrupt 13 if any part of the operand would lie outside of the effective
  49 address space from 0 to 0FFFFH
  50
  51 <H2>Virtual 8086 Mode Exceptions</H2>
  52
  53 Same exceptions as in real-address mode; #PF(fault-code) for a page
  54 fault
  55
  56
  57 <P>
  58 <HR>
  59 <P>
  60 <B>up:</B> <A HREF="c17.htm">
  61 Chapter 17 -- 80386 Instruction Set</A><BR>
  62 <B>prev:</B><A HREF="NOP.htm"> NOP No Operation</A><BR>
  63 <B>next:</B><A HREF="OR.htm"> OR Logical Inclusive OR</A>
  64 </BODY>