[PATCH] D17945: [LoopDataPrefetch/Aarch64] Allow selective prefetching of large-strided accesses

[Adam Nemet via llvm-commits]

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

And use this TTI for Cyclone.  As it was explained in the original RFC
(http://thread.gmane.org/gmane.comp.compilers.llvm.devel/92758), the HW
prefetcher work up to 2KB strides.

I am also adding tests for this and the previous change (D17943):

* Cyclone prefetching accesses with a large stride
* Cyclone not prefetching accesses with a small stride
* Generic Aarch64 subtarget not prefetching either

http://reviews.llvm.org/D17945

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
  test/Transforms/LoopDataPrefetch/AArch64/lit.local.cfg

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