[PATCH] D63885: [LOOPINFO] Introduce the loop guard API.

[Ettore Tiotto via Phabricator via llvm-commits]

etiotto added a comment.

In D63885#1563442 <https://reviews.llvm.org/D63885#1563442>, @Whitney wrote:

> @reames Thanks for the review! I agree that there are still much more to consider for how we want to define a loop guard, to make the most use of it.
>
> What's others opinion on disallow instructions with side effects in between the loop guard block and the loop header?


Ideally a 'proper' loop guard would protect the execution of the loop and nothing else. My opinion is that  we should not allow any instruction with side effects between the guard and the header. Perhaps we can consider weak and strong guards


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