AngoLinux

80386 Programmer's Reference Manual -- Opcode NOT

NOT -- One's Complement Negation

Opcode	Instruction	Clocks	Description	Example
F6 /2	notb r/m8	2/6	Reverse each bit of r/m byte	`notb %dl notb (%ebx,1) notb m8(%ebx,1) notb m8(%ebx,%ebp,1)`
F7 /2	notw r/m16	2/6	Reverse each bit of r/m word	`notw %cx notw (%ebx,1) notw (%ebx,2) notw (%ebx,%ebp,1)`
F7 /2	notl r/m32	2/6	Reverse each bit of r/m dword	`notl %ecx notl (%ebx,2) notl (%ebx,4) notl (%ebx,%ebp,1)`

Operation




r/m := NOT r/m;

Description

NOT inverts the operand; every 1 becomes a 0, and vice versa.

Flags Affected

None

Protected Mode Exceptions

#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

Real Address Mode Exceptions

Interrupt 13 if any part of the operand would lie outside of the effective address space from 0 to 0FFFFH

Virtual 8086 Mode Exceptions

Same exceptions as in real-address mode; #PF(fault-code) for a page fault

[Home Page dell'ITIS "Fermi"] [80386 Programmer's Reference Manual Index] [Previous] [Next]