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(nasm.info)Section B.4.206

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B.4.206. `PAVGUSB': Average of unsigned packed 8-bit values
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     PAVGUSB mm1,mm2/m64           ; 0F 0F /r BF          [PENT,3DNOW]

   `PAVGUSB' adds the unsigned data elements of the source operand to
the unsigned data elements of the destination register, then adds 1 to
the temporary results. The results of the add are then each
independently right-shifted by one bit position. The high order bits of
each element are filled with the carry bits of the corresponding sum.

   This instruction performs exactly the same operations as the `PAVGB'
`MMX' instruction (*Note Section B.4.205::).