[all-commits] [llvm/llvm-project] c373a1: LoopRotationUtils: Special case zero-branch weight...

[Matthias Braun via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c373a1ff181ca02e8a8e46ed22fbaabeaf1d17c7
      https://github.com/llvm/llvm-project/commit/c373a1ff181ca02e8a8e46ed22fbaabeaf1d17c7
  Author: Matthias Braun <matze at braunis.de>
  Date:   2023-09-22 (Fri, 22 Sep 2023)

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

  Log Message:
  -----------
  LoopRotationUtils: Special case zero-branch weight cases (#66681)

The formula I added to LoopRotationUtils does not produce reasonable
results if some of the branch weights are zero. Add special case
handling for this.

This fixes https://github.com/llvm/llvm-project/issues/66675