[PATCH] D17258: [LoopReroller] Allow setting MaxRerollIterations above 16

[Ayal Zaks via llvm-commits]

Ayal created this revision.
Ayal added reviewers: jmolloy, hfinkel.
Ayal added a subscriber: llvm-commits.
Herald added a subscriber: mzolotukhin.

LoopReroller currently handles upto 16 iterations and this threshold is hardwired. Using a larger threshold will work, although if set to more than 25 or so the SmallBitVectors used will run slower. This patch exports -max-rerolled-iterations flag to the command line, to allow setting a larger (than 16) threshold if interested. Regretfully, couldn’t find a better way to keep the Iteration Limit constants neatly together as they were, and yet allow to override them.

http://reviews.llvm.org/D17258

Files:
  lib/Transforms/Scalar/LoopRerollPass.cpp
  test/Transforms/LoopReroll/basic32iters.ll

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