LOOPDNE label     32-Bit 80386 LOOPNE (TASM Only)    Flags: O D I T S Z A P C

     Normally, whether or not ECX is used as the loop index is determined by
     whether the instruction is in a 16- or 32-bit segment. However, TASM lets
     you indicate that you want to use the ECX register for LOOPNE regardless
     of the current segment with the LOOPDNE instruction.

     See LOOPNE for more information.