[PATCH] D111681: [IVUsers] Move preheader check into SCEVExpander

[Nikita Popov via Phabricator via llvm-commits]

nikic created this revision.
nikic added reviewers: reames, mkazantsev.
Herald added subscribers: javed.absar, hiraditya.
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Rather than checking for loop nest preheaders upfront in IVUsers, move this requirement into isSafeToExpand() from SCEVExpander, which seems like logically the right place for this check.

This is a followup to https://reviews.llvm.org/D111493#3055286.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D111681

Files:
  llvm/include/llvm/Analysis/IVUsers.h
  llvm/lib/Analysis/IVUsers.cpp
  llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
  llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp

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