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(nasm.info)Section B.4.168

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B.4.168. `MOVLPS': Move Low Packed Single-Precision FP
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     MOVLPS xmm,m64                ; OF 12 /r        [KATMAI,SSE]
     MOVLPS m64,xmm                ; OF 13 /r        [KATMAI,SSE]

   `MOVLPS' moves two packed single-precision FP values 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.