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(nasm.info)Section B.4.241

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B.4.241. `PMULHW', `PMULLW': Multiply Packed 16-bit Integers, and Store
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     PMULHW mm1,mm2/m64            ; 0F E5 /r             [PENT,MMX]
     PMULLW mm1,mm2/m64            ; 0F D5 /r             [PENT,MMX]

     PMULHW xmm1,xmm2/m128         ; 66 0F E5 /r     [WILLAMETTE,SSE2]
     PMULLW xmm1,xmm2/m128         ; 66 0F D5 /r     [WILLAMETTE,SSE2]

   `PMULxW' takes two packed unsigned 16-bit integer inputs, and
multiplies the values in the inputs, forming doubleword results.

   * `PMULHW' then stores the top 16 bits of each doubleword in the
     destination (first) operand;

   * `PMULLW' stores the bottom 16 bits of each doubleword in the
     destination operand.