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(nasm.info)Section B.4.256

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B.4.256. `PSRAx': Packed Data Bit Shift Right Arithmetic
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     PSRAW mm1,mm2/m64             ; 0F E1 /r             [PENT,MMX]
     PSRAW mm,imm8                 ; 0F 71 /4 ib          [PENT,MMX]

     PSRAW xmm1,xmm2/m128          ; 66 0F E1 /r     [WILLAMETTE,SSE2]
     PSRAW xmm,imm8                ; 66 0F 71 /4 ib  [WILLAMETTE,SSE2]

     PSRAD mm1,mm2/m64             ; 0F E2 /r             [PENT,MMX]
     PSRAD mm,imm8                 ; 0F 72 /4 ib          [PENT,MMX]

     PSRAD xmm1,xmm2/m128          ; 66 0F E2 /r     [WILLAMETTE,SSE2]
     PSRAD xmm,imm8                ; 66 0F 72 /4 ib  [WILLAMETTE,SSE2]

   `PSRAx' performs arithmetic right shifts of the data elements in the
destination (first) operand, moving each bit in the separate elements
right by the number of bits specified in the source (second) operand,
setting the high-order bits to the value of the original sign bit.

   * `PSRAW' shifts word sized elements.

   * `PSRAD' shifts doubleword sized elements.