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(nasm.info)Section B.4.176

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B.4.176. `MOVQ': Move Quadword to/from MMX Register
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     MOVQ mm1,mm2/m64               ; 0F 6F /r             [PENT,MMX]
     MOVQ mm1/m64,mm2               ; 0F 7F /r             [PENT,MMX]

     MOVQ xmm1,xmm2/m64             ; F3 0F 7E /r    [WILLAMETTE,SSE2]
     MOVQ xmm1/m64,xmm2             ; 66 0F D6 /r    [WILLAMETTE,SSE2]

   `MOVQ' copies 64 bits from its source (second) operand into its
destination (first) operand. When the source is an `XMM' register, the
low quadword is moved. When the destination is an `XMM' register, the
destination is the low quadword, and the high quadword is cleared.