PUNPCKLDQ       Unpack (interleave) Low-order Doublewords

PUNPCKLDQ destination, source                        CPU: MMX

        Logic   mm(63..32) <- mm/m32(31..0)
                mm(31..0)  <- mm(31..0)

    PUNPCKLDQ interleaves the low-order doubleword of the source
    operand and the low-order doubleword of the destination operand
    and writes them to the destination.

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

    When unpacking from a memory operand, only 32 bits are accessed.


    Opcode      Format
    0F 62 /r    PUNPCKLDQ mm, mm/m64