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(nasm.info)Section B.4.240

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B.4.240. `PMULHUW': Multiply Packed 16-bit Integers, and Store High Word
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     PMULHUW mm1,mm2/m64           ; 0F E4 /r        [KATMAI,MMX]
     PMULHUW xmm1,xmm2/m128        ; 66 0F E4 /r     [WILLAMETTE,SSE2]

   `PMULHUW' takes two packed unsigned 16-bit integer inputs, multiplies
the values in the inputs, then stores bits 16-31 of each result to the
corresponding position of the destination register.