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MOVSD             Move String Doubleword (386)       Flags: O D I T S Z A P C

MOVSD

           Logic:        DWORD PTR ES:DI . DWORD PTR (DS:SI)
                         if DF = 0
                             SI . SI + 4
                             DI . DI + 4
                         else
                             SI . SI - 4
                             DI . DI - 4

     This instruction copies the doubleword at DS:SI to ES:DI. If the
     destination flag is cleared, SI and DI are incremented by 4. Otherwise,
     they are decremented by 4.

     If the strings are DWORD-aligned, MOVSD works more quickly than either
     MOVSB or MOVSW to transfer large strings.

  --------------------------------------------------------------------------
   Operands                   Clocks   Transfers  Bytes  Example
   MOVSD                      7 (386)      4        1    MOVSD
  --------------------------------------------------------------------------

        Note:          This instruction is usually used with a REP
                       prefix. Load CX with the number of times to repeat
                       the instruction.