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(nasm.info)Section B.4.233

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B.4.233. `PMAXSW': Packed Signed Integer Word Maximum
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     PMAXSW mm1,mm2/m64            ; 0F EE /r        [KATMAI,MMX]
     PMAXSW xmm1,xmm2/m128         ; 66 0F EE /r     [WILLAMETTE,SSE2]

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