Lesson plan
Loop inversion
In computer science, loop inversion is a compiler optimization and loop transformation in which a while loop is replaced by an if block containing a do..while loop. When used correctly, it may improve performance due to instruction pipelining or avoiding jump instructions to reduce branch mis-prediction. In a while loop (indefinite iteration), the condition must be tested for each iteration. When the test fails, the loop is exited. By putting the test at the end of the loop body, loop inversion avoids any jumps at the end of the final iteration.
Article summary
In computer science, loop inversion is a compiler optimization and loop transformation in which a while loop is replaced by an if block containing a do..while loop. When used correctly, it may improve performance due to instruction pipelining or avoiding jump instructions to reduce branch mis-prediction. In a while loop (indefinite iteration), the condition must be tested for each iteration. When the test fails, the loop is exited. By putting the test at the end of the loop body, loop inversion avoids any jumps at the end of the final iteration.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.