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(nasm.info)Section B.4.213

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B.4.213. `PFADD': Packed Single-Precision FP Addition
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     PFADD mm1,mm2/m64             ; 0F 0F /r 9E          [PENT,3DNOW]

   `PFADD' performs addition on each of two packed single-precision FP
value pairs.

        dst[0-31]   := dst[0-31]  + src[0-31],
        dst[32-63]  := dst[32-63] + src[32-63].