LOOPD label       32-Bit 80386 LOOP (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 LOOP regardless
     of the current segment with the LOOPD instruction.

     See LOOP for more information.