[PATCH] D19553: Unroll pass restructure.

[Evgeny Stupachenko via llvm-commits]

evstupac created this revision.
evstupac added reviewers: mzolotukhin, sanjoy, escha, resistor.
evstupac added subscribers: llvm-commits, zansari.
evstupac set the repository for this revision to rL LLVM.
Herald added subscribers: mzolotukhin, sanjoy.

The patch restructure unroll pass (a part where decision on unroll Count is made).
It adds some comments and early exits when unroll Count decision is obvious.
The patch does not affect trunk, but can affect architectures where unroll remainder is not allowed. However it is easy to disable it in Unroll Preferences structure.

I've got build same on all spec benchmarks for x86.

Repository:
  rL LLVM

http://reviews.llvm.org/D19553

Files:
  include/llvm/Analysis/TargetTransformInfo.h
  include/llvm/Transforms/Utils/UnrollLoop.h
  lib/Transforms/Scalar/LoopUnrollPass.cpp
  lib/Transforms/Utils/LoopUnroll.cpp
  test/Transforms/LoopUnroll/partial-unroll-const-bounds.ll

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