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(nasm.info)Section B.4.322

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B.4.322. `UNPCKHPD': Unpack and Interleave High Packed Double-Precision FP Values
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     UNPCKHPD xmm1,xmm2/m128       ; 66 0F 15 /r     [WILLAMETTE,SSE2]

   `UNPCKHPD' performs an interleaved unpack of the high-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[127-64];
        dst[127-64] := src[127-64].