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PADDW           Add with Wrap-around on Word

PADDW destination, source                            CPU: MMX

        Logic   mm(15..0)  <- mm(15..0)  + mm/m64(15..0)
                mm(31..16) <- mm(31..16) + mm/m64(31..16)
                mm(47..32) <- mm(47..32) + mm/m64(47..32)
                mm(63..48) <- mm(63..48) + mm/m64(63..48)

    PADDW adds the words of the source operand to the words of the
    destination operand and writes the results to the destination.

    When the result is too large to be represented in a packed word
    (overflow), the result wraps around and the lower 16 bits are
    written to the destination register.

    The destination operand is an MMX register. The source operand can
    either be an MMX register or a 64-bit memory operand.


    Opcode      Format
    0F FD /r    PADDW mm, mm/m64