A.5.236 PMINUB: Packed Unsigned Integer Byte Minimum
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.