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(nasm.info)Section B.4.254

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B.4.254. `PSHUFW': Shuffle Packed Words
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     PSHUFW mm1,mm2/m64,imm8       ; 0F 70 /r ib     [KATMAI,MMX]

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

   Bits 0 and 1 of imm8 encode the source position of the word to be
copied to position 0 in the destination operand. Bits 2 and 3 encode
for position 1, bits 4 and 5 encode for position 2, and bits 6 and 7
encode for position 3.  For example, an encoding of 10 in bits 0 and 1
of imm8 indicates that the word at bits 32-47 of the source operand
will be copied to bits 0-15 of the destination.