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Well, it doesn't really matter too much. The major problem is here is the quotient size of 32 bit, and this requires a more complicated algorithm than a cascaded divu with has a quotient of 16 bit. A 32/16 full division with 32 remainder and 32 bit quotient is easy with divu, but a full 32/32 division requires "algorithm D" (or some other division algorithm) and is more complex than what is shown here.
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