LOOPDE label      32-Bit 80386 LOOPE (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 LOOPE regardless
     of the current segment with the LOOPDE instruction.

     See LOOPE for more information.