[PATCH] D18898: [Loop Rotation] Make default max rotation header size threshold dependent on target CPU

[Andrey Turetskiy via llvm-commits]

aturetsk created this revision.
aturetsk added reviewers: mzolotukhin, nadav, bogner, bruno, echristo.
aturetsk added subscribers: llvm-commits, zinovy.nis.
Herald added a subscriber: mzolotukhin.

Make default max rotation header size threshold dependent on target CPU through TTI.
Also set the threshold to 2 for Lakemont. Experiments on MCU benchmarks (Dhrystone, Coremark) show that this is the most optimal value for code size and performance.

http://reviews.llvm.org/D18898

Files:
  include/llvm/Analysis/TargetTransformInfo.h
  include/llvm/Analysis/TargetTransformInfoImpl.h
  include/llvm/CodeGen/BasicTTIImpl.h
  lib/Analysis/TargetTransformInfo.cpp
  lib/Target/X86/X86TargetTransformInfo.cpp
  lib/Target/X86/X86TargetTransformInfo.h
  lib/Transforms/Scalar/LoopRotation.cpp
  test/Transforms/LoopRotate/target-default.ll

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