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(nasm.info)Section B.4.226

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B.4.226. `PFSUBR': Packed Single-Precision FP Reverse Subtract
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     PFSUBR mm1,mm2/m64            ; 0F 0F /r AA          [PENT,3DNOW]

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

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