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(nasm.info)Section B.4.167

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B.4.167. `MOVLPD': Move Low Packed Double-Precision FP
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     MOVLPD xmm,m64                ; 66 OF 12 /r     [WILLAMETTE,SSE2]
     MOVLPD m64,xmm                ; 66 OF 13 /r     [WILLAMETTE,SSE2]

   `MOVLPD' 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 low quadword of an `XMM' register.

   The operation of this instruction is:

        mem(0-63)   := xmm(0-63);

   or

        xmm(0-63)   := mem(0-63);
        xmm(64-127) remains unchanged.