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(nasm.info)Section B.4.161

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B.4.161. `MOVDQA': Move Aligned Double Quadword
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     MOVDQA xmm1,xmm2/m128         ; 66 OF 6F /r     [WILLAMETTE,SSE2]
     MOVDQA xmm1/m128,xmm2         ; 66 OF 7F /r     [WILLAMETTE,SSE2]

   `MOVDQA' moves a double quadword from the source operand to the
destination operand. When the source or destination operand is a memory
location, it must be aligned to a 16-byte boundary.

   To move a double quadword to or from unaligned memory locations, use
the `MOVDQU' instruction (*Note Section B.4.162::).