[PATCH] D17949: [LoopDataPrefetch] Add TTI to limit the number of iterations to prefetch ahead

[Adam Nemet via llvm-commits]

anemet created this revision.
anemet added a reviewer: hfinkel.
anemet added a subscriber: llvm-commits.
Herald added a subscriber: mzolotukhin.

It can hurt performance to prefetch ahead too much.  Be conservative for
now and don't prefetch ahead more than 3 iterations on Cyclone.

http://reviews.llvm.org/D17949

Files:
  include/llvm/Analysis/TargetTransformInfo.h
  include/llvm/Analysis/TargetTransformInfoImpl.h
  lib/Analysis/TargetTransformInfo.cpp
  lib/Target/AArch64/AArch64TargetTransformInfo.cpp
  lib/Target/AArch64/AArch64TargetTransformInfo.h
  lib/Transforms/Scalar/LoopDataPrefetch.cpp
  test/Transforms/LoopDataPrefetch/AArch64/large-stride.ll

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