[PATCH] [Patch] Loop Interchange Pass

[Karthik Bhat]

Hi Hal,
Updated the test case to add a test case to cover case were we have a usage of PHI outside the loop. I have added gi,gj as global vaiable and used them as induction variables in the loop to simulate this case.

It would be great if you could give me some inputs on writing test case for this pass. 
Currently the test cases i have added are all more or less similar(i.e. they get vectorized after interchange).
For checking loop that are just interchanged but not vectorized do we have to check the exact instructions after interchange or may be check the PHI instruction order in .ll (after interchange the Induction PHI will be in the reverse order) ?

Thanks
Karthik Bhat


http://reviews.llvm.org/D7499

Files:
  include/llvm/InitializePasses.h
  include/llvm/LinkAllPasses.h
  include/llvm/Transforms/Scalar.h
  lib/Transforms/Scalar/CMakeLists.txt
  lib/Transforms/Scalar/LoopInterchange.cpp
  lib/Transforms/Scalar/Scalar.cpp
  test/Transforms/LoopInterchange/dependence.ll

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