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(nasm.info)Section B.4.182

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B.4.182. `MOVUPD': Move Unaligned Packed Double-Precision FP Values
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     MOVUPD xmm1,xmm2/mem128       ; 66 0F 10 /r     [WILLAMETTE,SSE2]
     MOVUPD xmm1/mem128,xmm2       ; 66 0F 11 /r     [WILLAMETTE,SSE2]

   `MOVUPD' moves a double quadword containing 2 packed double-precision
FP values from the source operand to the destination. This instruction
makes no assumptions about alignment of memory operands.

   To move data in and out of memory locations that are known to be on
16-byte boundaries, use the `MOVAPD' instruction (*Note Section
B.4.157::).