JCXZ             Jump If CX Register Zero            Flags: not altered

JCXZ short-label

Jump Condition:  Jump if CX = 0

JCXZ transfers control to short-label if the CX register is 0. The
target of the jump must be within -128 to +127 bytes of the next
instruction.

                                                                          
Operands                  Clocks   Transfers  Bytes   Example
short-label              18 or 6       -        2     JCXZ COUNT_DONE
                                                                          

Note:          This instruction is commonly used at the beginning
of a loop to bypass the loop if the counter variable
(CX) is at 0.

See also: LOOP
See also: LOOPE
See also: LOOPZ
See also: LOOPNZ
See also: LOOPNE

JCXZ Jump if CX Register Zero