[PATCH] D127149: [LoopFlatten] Fix crash if the inner loop trip count comes from a sext instruction.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added a reviewer: SjoerdMeijer.
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If we look through a truncate in matchLinearIVUser, it's possible
we find a sext/zext instruction that didn't come from widening.
This will fail the MatchedItCount->getType() == InnerInductionPHI->getType()
assertion.

Fix this by checking that we did not look through a truncate already.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D127149

Files:
  llvm/lib/Transforms/Scalar/LoopFlatten.cpp
  llvm/test/Transforms/LoopFlatten/widen-iv.ll

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