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(nasm.info)Section B.4.183

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B.4.183. `MOVUPS': Move Unaligned Packed Single-Precision FP Values
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     MOVUPS xmm1,xmm2/mem128       ; 0F 10 /r        [KATMAI,SSE]
     MOVUPS xmm1/mem128,xmm2       ; 0F 11 /r        [KATMAI,SSE]

   `MOVUPS' moves a double quadword containing 4 packed single-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 `MOVAPS' instruction (*Note Section
B.4.158::).