[all-commits] [llvm/llvm-project] 896037: [LoopRotate] Set loop back edge weight to not less...

[Haohai Wen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 896037c75ace929327e5b0bf5832157f9d81e6e7
      https://github.com/llvm/llvm-project/commit/896037c75ace929327e5b0bf5832157f9d81e6e7
  Author: Haohai Wen <haohai.wen at intel.com>
  Date:   2024-03-28 (Thu, 28 Mar 2024)

  Changed paths:
    M llvm/lib/Transforms/Utils/LoopRotationUtils.cpp
    M llvm/test/Transforms/LoopRotate/update-branch-weights.ll

  Log Message:
  -----------
  [LoopRotate] Set loop back edge weight to not less than exit weight (#86496)

Branch weight from sample-based PGO may be not inaccurate due to
sampling. If the loop body must be executed, then origin loop back
edge weight must be not less than exit weight.



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