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      The TMS320C2x provides a scaling shifter that has a 16-bit input
      connected to the data bus and a 32-bit output connected to the ALU.
      The scaling shifter produces a left shift of 0 to 16 bits on the
      input data, as programmed in the instruction. The LSB's of the
      output are filled with zeroes, and the MSB's may either be filled
      with zeroes or sign-extended, depending upon the status programmed
      into the SXM (sign-extension mode) bit of status register ST1.

      The TMS320C2x also contains several other shifters which allow it
      to perform numerical scaling, bit extraction, extended-precision
      arithmetic, and overflow prevention. These shifters are connected
      to the output of the multiplier and the accumulator.