[PATCH] D28393: [SCEV] Make howFarToZero produce a smaller max backedge-taken count

[Eli Friedman via Phabricator via llvm-commits]

efriedma created this revision.
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Herald added a subscriber: mzolotukhin.

Use the obvious formula for the maximum backedge-taken count.  Use isLoopEntryGuardedByCond to cover some more common cases.


Repository:
  rL LLVM

https://reviews.llvm.org/D28393

Files:
  lib/Analysis/ScalarEvolution.cpp
  test/Analysis/ScalarEvolution/max-trip-count.ll

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