[PATCH] D28593: Update loop branch_weight metadata after loop rotation.

[Xin Tong via Phabricator via llvm-commits]

trentxintong updated this revision to Diff 97497.
trentxintong added a comment.

Rework the reworked metadata update in loop rotation. I still have some hardcoded numbers
i do not know whether to put them as options.

At least, we should try to agree on the mechanism itself and start collecting some numbers.


https://reviews.llvm.org/D28593

Files:
  lib/Transforms/Scalar/LoopRotation.cpp
  lib/Transforms/Utils/LoopUtils.cpp
  test/Transforms/LoopRotate/loop-rotate-pgo.ll
  test/Transforms/LoopUnroll/peel-loop-pgo.ll

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