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LOOPNZ
LOOPNE
LOOPWHILE
NOT
ZERO
LOOP WHILE
NOT
EQUAL
LOOPNZ
LOOPNE
Operation:
(ex)
+-
(eX)-1
Flags Affected:
if (ZF) = 0 and
(eX)
=1=
0 then
(lP)
+-
(IP) +
disp
(sign-extended
to 16-bits)
Description:
LOOPNE/LOOPNZ short-label
LOOPNE
and
LOOPNZ
(Loop While
Not
Equal and
Loop
While
Not
Zero) are also
synonyms for the same instruction.
ex
is
decremented by
1,
and
control
is
transferred to
the target
operand
if ex
is
not
0
and
if
ZF
is
clear; otherwise the next sequential instruction
is
executed.
Encoding:
1111
00000
1
disp
None
LOOPNE/LOOPNZ Operands
Clocks
Transfers
Bytes
short-label
19
or
5 -
2
2-115
LOOPNE
Coding
Example
LOOPNE AGAIN