[PATCH] D129297: [LSR] Fix bug - check if loop has preheader before calling isInductionPHI

[Michael Kruse via Phabricator via llvm-commits]

Meinersbur accepted this revision.
Meinersbur added a subscriber: nathanchance.
Meinersbur added a comment.
This revision is now accepted and ready to land.

In the interest to not block @nathanchance with a crashing compiler, I suggest to commit as soon as possible. However, a complete patch would also include a regression test.



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Comment at: llvm/lib/Transforms/Utils/LoopUtils.cpp:1249
 
+bool checkIsIndPhi(PHINode *Phi, Loop *L, ScalarEvolution *SE,
+                   InductionDescriptor &ID) {
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Please add a doxygen comment briefly describing what this is checking.


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https://reviews.llvm.org/D129297