BSWAP - Byte Swap       (486+)

        Usage:  BSWAP   reg32
        Modifies flags: none

        Changes the byte order of a 32 bit register from big endian to
        little endian or vice versa.   Result left in destination register
        is undefined if the operand is a 16 bit register.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        reg32             -     -     -     1             2

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