[PATCH] D149251: [SCEV] Don't expect BackedgeTakenCounts cache to contain an entry for loop in getBackedgeTakenInfo

[Dmitry Makogon via Phabricator via llvm-commits]

dmakogon updated this revision to Diff 517884.
dmakogon added a comment.

Reworked the change as discussed offline with Max. The recursive call could happen in code that updates some stats. Namely in BackedgeTakenInfo::getExact. But the only usage of its result was to compare it against SCEVCouldNotCompute. So I added a new API to BackedgeTakenInfo which returns whether it can compute the exact exit count for loop and used it instead of its computation.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D149251/new/

https://reviews.llvm.org/D149251

Files:
  llvm/include/llvm/Analysis/ScalarEvolution.h
  llvm/lib/Analysis/ScalarEvolution.cpp
  llvm/test/Analysis/ScalarEvolution/pr62380.ll

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