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Fixed point arithmetic is preferred to floating point on a small part because it

  • A.requires no scaling to be chosen by the programmer
  • B.cannot suffer from rounding error
  • C.needs only integer instructions
  • D.gives a larger dynamic range than floating point

Answer: C

A core without a floating point unit emulates every operation in software at tens of cycles each, whereas fixed point arithmetic is ordinary integer work. The costs are a limited dynamic range and the discipline of tracking the scaling.

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