What is the motivation for pre/main/post loops?

[Cao, Joshua]

I can't find any notes on this. The closest I can find is https://wiki.openjdk.org/pages/viewpage.action?pageId=20415918


> clone loop body and create pre-, main- and post- loops


I can guess why a post loop is useful. We can use it for the remainder iterations after loop unrolling.

However, I cannot think of scenarios where a pre-loop is useful. What are some cases where a

pre-loop is useful?
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