[PATCH] D103333: [LoopUnroll] Clean up exit folding (NFC)

[Nikita Popov via Phabricator via llvm-commits]

nikic created this revision.
nikic added a reviewer: reames.
Herald added subscribers: zzheng, hiraditya.
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This does some non-functional cleanup of exit folding during unrolling. The two main changes are:

- First rewrite latch->header edges, which is unrelated to exit folding.
- Combine folding for latch and non-latch exits. After the previous change, these use the same logic, with the caveat that for non-latch exits we currently only fold "known non-exit" cases, but not "known exit" cases.

I think this helps a lot to clarify this code and prepare it for future changes.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D103333

Files:
  llvm/lib/Transforms/Utils/LoopUnroll.cpp

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