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(nasm.info)Section B.4.212

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B.4.212. `PFACC': Packed Single-Precision FP Accumulate
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     PFACC mm1,mm2/m64             ; 0F 0F /r AE          [PENT,3DNOW]

   `PFACC' adds the two single-precision FP values from the destination
operand together, then adds the two single-precision FP values from the
source operand, and places the results in the low and high doublewords
of the destination operand.

   The operation is:

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