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(nasm.info)Section B.4.236

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B.4.236. `PMINUB': Packed Unsigned Integer Byte Minimum
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     PMINUB mm1,mm2/m64            ; 0F DA /r        [KATMAI,MMX]
     PMINUB xmm1,xmm2/m128         ; 66 0F DA /r     [WILLAMETTE,SSE2]

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