[PATCH] D17632: [LoopUnrollAnalyzer] Check that we're using SCEV for the same loop we're simulating.

[Michael Zolotukhin via llvm-commits]

mzolotukhin created this revision.
mzolotukhin added reviewers: chandlerc, hfinkel.
mzolotukhin added a subscriber: llvm-commits.
Herald added subscribers: mzolotukhin, sanjoy.

Check that we're using SCEV for the same loop we're simulating. Otherwise, we might try to use the iteration number of the current loop in SCEV expressions for inner/outer loops IVs, which is clearly incorrect.

http://reviews.llvm.org/D17632

Files:
  include/llvm/Analysis/LoopUnrollAnalyzer.h
  lib/Analysis/LoopUnrollAnalyzer.cpp
  lib/Transforms/Scalar/LoopUnrollPass.cpp
  unittests/Analysis/UnrollAnalyzer.cpp

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