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(nasm.info)Section B.4.251

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B.4.251. `PSHUFD': Shuffle Packed Doublewords
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     PSHUFD xmm1,xmm2/m128,imm8    ; 66 0F 70 /r ib  [WILLAMETTE,SSE2]

   `PSHUFD' shuffles the doublewords 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 doubleword 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 doubleword at bits 64-95 of the source
operand will be copied to bits 0-31 of the destination.