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The optimization which avoids test at every iteration is?

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The optimization which avoids test at every iteration is?

(a) Loop unrolling

(b) Loop jamming

(c) Constant folding

(d) None of the mentioned

The question was posed to me in final exam.

This intriguing question comes from Bottom-Up Parsing-2 topic in chapter Bottom Up Parsing of Compiler

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Right answer is (a) Loop unrolling

To explain: Execution speed is enhanced by sacrificing bits.

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