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(nasm.info)Section B.4.157

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B.4.157. `MOVAPD': Move Aligned Packed Double-Precision FP Values
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     MOVAPD xmm1,xmm2/mem128       ; 66 0F 28 /r     [WILLAMETTE,SSE2]
     MOVAPD xmm1/mem128,xmm2       ; 66 0F 29 /r     [WILLAMETTE,SSE2]

   `MOVAPD' moves a double quadword containing 2 packed double-precision
FP values from the source operand to the destination. When the source or
destination operand is a memory location, it must be aligned on a
16-byte boundary.

   To move data in and out of memory locations that are not known to be
on 16- byte boundaries, use the `MOVUPD' instruction (*Note Section
B.4.182::).