[PATCH] D44461: [SCEV] Consider guards in exit limit computation

[Max Kazantsev via Phabricator via llvm-commits]

mkazantsev created this revision.
mkazantsev added reviewers: sanjoy, apilipenko, skatkov, DaniilSuchkov, reames.

Current implementation of computeExitLimit only allows to use explicit
branch conditions to evaluate backedge taken count. This patch teaches
it to take guards conditions into account as well.


https://reviews.llvm.org/D44461

Files:
  lib/Analysis/ScalarEvolution.cpp
  test/Analysis/ScalarEvolution/exit_count_from_guards.ll
  test/Analysis/ScalarEvolution/no-wrap-unknown-becount.ll

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