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(nasm.info)Section B.4.209

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B.4.209. `PEXTRW': Extract Word
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     PEXTRW reg32,mm,imm8          ; 0F C5 /r ib     [KATMAI,MMX]
     PEXTRW reg32,xmm,imm8         ; 66 0F C5 /r ib  [WILLAMETTE,SSE2]

   `PEXTRW' moves the word in the source register (second operand) that
is pointed to by the count operand (third operand), into the lower half
of a 32-bit general purpose register. The upper half of the register is
cleared to all 0s.

   When the source operand is an `MMX' register, the two least
significant bits of the count specify the source word. When it is an
`SSE' register, the three least significant bits specify the word
location.