[PATCH] D26527: Use profile info to adjust loop unroll threshold.

[Dehao Chen via llvm-commits]

danielcdh created this revision.
danielcdh added reviewers: davidxl, mzolotukhin.
danielcdh added a subscriber: llvm-commits.
Herald added subscribers: mehdi_amini, sanjoy.

For flat loop, even if it is hot, it is not a good idea to unroll in runtime, thus we set a lower partial unroll threshold.
For hot loop, we set a higher unroll threshold and allows expensive tripcount computation to allow more aggressive unrolling.


https://reviews.llvm.org/D26527

Files:
  include/llvm/Analysis/LoopPassManager.h
  lib/Passes/PassBuilder.cpp
  lib/Transforms/Scalar/LoopUnrollPass.cpp
  test/Other/pass-pipelines.ll
  test/Transforms/LoopUnroll/unloop.ll
  test/Transforms/LoopUnroll/unroll-heuristics-pgo.ll

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