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(nasm.info)Section B.4.242

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B.4.242. `PMULUDQ': Multiply Packed Unsigned 32-bit Integers, and Store.
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     PMULUDQ mm1,mm2/m64           ; 0F F4 /r        [WILLAMETTE,SSE2]
     PMULUDQ xmm1,xmm2/m128        ; 66 0F F4 /r     [WILLAMETTE,SSE2]

   `PMULUDQ' takes two packed unsigned 32-bit integer inputs, and
multiplies the values in the inputs, forming quadword results. The
source is either an unsigned doubleword in the low doubleword of a
64-bit operand, or it's two unsigned doublewords in the first and third
doublewords of a 128-bit operand. This produces either one or two
64-bit results, which are stored in the respective quadword locations
of the destination register.

   The operation is:

        dst[0-63]   := dst[0-31]  * src[0-31];
        dst[64-127] := dst[64-95] * src[64-95].