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(nasm.info)Section B.4.234

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B.4.234. `PMAXUB': Packed Unsigned Integer Byte Maximum
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     PMAXUB mm1,mm2/m64            ; 0F DE /r        [KATMAI,MMX]
     PMAXUB xmm1,xmm2/m128         ; 66 0F DE /r     [WILLAMETTE,SSE2]

   `PMAXUB' compares each pair of bytes in the two source operands, and
for each pair it stores the maximum value in the destination register.