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(nasm.info)Section B.4.253

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B.4.253. `PSHUFLW': Shuffle Packed Low Words
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     PSHUFLW xmm1,xmm2/m128,imm8   ; F2 0F 70 /r ib  [WILLAMETTE,SSE2]

   `PSHUFLW' shuffles the words in the low quadword of the source
(second) operand according to the encoding specified by imm8, and stores
the result in the low quadword of the destination (first) operand.

   The operation of this instruction is similar to the `PSHUFW'
instruction, except that the source and destination are the low
quadword of a 128-bit operand, instead of being 64-bit operands. The
high quadword is copied from the source to the destination without any
changes.