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(nasm.info)Section B.4.164

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B.4.164. `MOVHPD': Move High Packed Double-Precision FP
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     MOVHPD xmm,m64               ; 66 OF 16 /r      [WILLAMETTE,SSE2]
     MOVHPD m64,xmm               ; 66 OF 17 /r      [WILLAMETTE,SSE2]

   `MOVHPD' moves a double-precision FP value between the source and
destination operands. One of the operands is a 64-bit memory location,
the other is the high quadword of an `XMM' register.

   The operation of this instruction is:

        mem[0-63]   := xmm[64-127];

   or

        xmm[0-63]   remains unchanged;
        xmm[64-127] := mem[0-63].