[PATCH] D30757: [LoopUnroll] Handle loops where the exiting block is different from the latch

[Michael Kuperstein via Phabricator via llvm-commits]

mkuper created this revision.

The previous version assumed it can't happen under the conditions in which this is entered (single exit block, single exiting block, latch has conditional branch).
In the presence of irreducible control flow, that assumption is incorrect - so this needs to be handled after all.

This fixes PR32178.


https://reviews.llvm.org/D30757

Files:
  lib/Transforms/Utils/LoopUnrollPeel.cpp
  test/Transforms/LoopUnroll/peel-loop-irreducible.ll
  test/Transforms/LoopUnroll/peel-loop-not-forced.ll

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