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(nasm.info)Section B.4.218

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B.4.218. `PFNACC': Packed Single-Precision FP Negative Accumulate
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     PFNACC mm1,mm2/m64            ; 0F 0F /r 8A          [PENT,3DNOW]

   `PFNACC' performs a negative accumulate of the two single-precision
FP values in the source and destination registers. The result of the
accumulate from the destination register is stored in the low
doubleword of the destination, and the result of the source accumulate
is stored in the high doubleword of the destination register.

   The operation is:

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