A.5.322 UNPCKHPD: Unpack and Interleave High Packed Double-Precision FP
Values
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].