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(nasm.info)Section B.4.225

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B.4.225. `PFSUB': Packed Single-Precision FP Subtract
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     PFSUB mm1,mm2/m64             ; 0F 0F /r 9A          [PENT,3DNOW]

   `PFSUB' subtracts the single-precision FP values in the source from
those in the destination, and stores the result in the destination
operand.

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