[PATCH] D90421: [IndVarSimplify][LoopUtils] Move WidenIV to Utils. NFCI.

[Sjoerd Meijer via Phabricator via llvm-commits]

SjoerdMeijer created this revision.
SjoerdMeijer added reviewers: fhahn, reames, lebedev.ri, dmgreen.
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This moves `WidenIV` from IndVarSimplify to LoopUtils so that we have `createWideIV` available as a generic helper utility. I.e., this is not only useful in IndVarSimplify, but could be useful for loop transformations. For example, motivation for this refactoring is the loop flatten transformation: if induction variables in a loop nest can be widened, we can avoid having to perform certain overflow checks, enabling this transformation.


https://reviews.llvm.org/D90421

Files:
  llvm/include/llvm/Transforms/Utils/LoopUtils.h
  llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
  llvm/lib/Transforms/Utils/LoopUtils.cpp

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