[PATCH] D63918: [LoopPeeling] Better handling of branch weights for small values

[Serguei Katkov via Phabricator via llvm-commits]

skatkov created this revision.
skatkov added reviewers: reames, mkuper, iajbar, fhahn.
Herald added a subscriber: zzheng.

If the original exit weight for latch to exit is small the new
weights for copies of latch will be non-informative like
[0,1] if original exit weight is 1.

This CL tries to scale original exit weight to get reasonable values.


https://reviews.llvm.org/D63918

Files:
  lib/Transforms/Utils/LoopUnrollPeel.cpp
  test/Transforms/LoopUnroll/peel-loop-pgo-small-weigth.ll
  test/Transforms/LoopUnroll/peel-loop-pgo.ll

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