Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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JCXZ/JECXZ Instruction
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  Title:    Jump if CX is Zero                    Flags: O D I T S Z A P C
                                                         ═════════════════
  Syntax:   JCXZ label                                        -none-
            JECXZ label
 
  See also: LOOP, .REPEAT, REP, Jcond
 
  Description:
 
     Transfers program execution to the specified label if CX is 0. On
     the 80386/486, JECXZ can be used to jump if ECX is 0. If the count
     register is not 0, execution continues at the next instruction.
     The label given as the operand must be short (between -128 and
     +127 bytes from the instruction following the jump).
                                    -♦-