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(nasm.info)Section B.4.205

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B.4.205. `PAVGB' `PAVGW': Average Packed Integers
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     PAVGB mm1,mm2/m64             ; 0F E0 /r        [KATMAI,MMX]
     PAVGW mm1,mm2/m64             ; 0F E3 /r        [KATMAI,MMX,SM]

     PAVGB xmm1,xmm2/m128          ; 66 0F E0 /r     [WILLAMETTE,SSE2]
     PAVGW xmm1,xmm2/m128          ; 66 0F E3 /r     [WILLAMETTE,SSE2]

   `PAVGB' and `PAVGW' add 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.

   * `PAVGB' operates on packed unsigned bytes, and

   * `PAVGW' operates on packed unsigned words.