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(nasm.info)Section B.4.204

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B.4.204. `PAVEB': MMX Packed Average
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     PAVEB mmxreg,r/m64            ; 0F 50 /r             [CYRIX,MMX]

   `PAVEB', specific to the Cyrix MMX extensions, treats its two
operands as vectors of eight unsigned bytes, and calculates the average
of the corresponding bytes in the operands. The resulting vector of
eight averages is stored in the first operand.

   This opcode maps to `MOVMSKPS r32, xmm' on processors that support
the SSE instruction set.