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(nasm.info)Section B.4.324

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B.4.324. `UNPCKLPD': Unpack and Interleave Low Packed Double-Precision FP Data
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     UNPCKLPD xmm1,xmm2/m128       ; 66 0F 14 /r     [WILLAMETTE,SSE2]

   `UNPCKLPD' performs an interleaved unpack of the low-order data
elements of the source and destination operands, saving the result in
`xmm1'. It ignores the lower half of the sources.

   The operation of this instruction is:

        dst[63-0]   := dst[63-0];
        dst[127-64] := src[63-0].