[all-commits] [llvm/llvm-project] 418177: [LoopPeel] prevent estimated trip count overflow b...

[Arda Serdar Pektezol via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 418177ff46eac2ec50131bb3894d686613db446e
      https://github.com/llvm/llvm-project/commit/418177ff46eac2ec50131bb3894d686613db446e
  Author: Arda Serdar Pektezol <arda at pektezol.dev>
  Date:   2026-05-06 (Wed, 06 May 2026)

  Changed paths:
    M llvm/lib/Transforms/Utils/LoopPeel.cpp
    M llvm/lib/Transforms/Utils/LoopUtils.cpp
    A llvm/test/Transforms/LoopUnroll/negative-trip-count.ll

  Log Message:
  -----------
  [LoopPeel] prevent estimated trip count overflow before peel (#195610)

`if (*EstimatedTripCount + AlreadyPeeled <= MaxPeelCount)` case in
`LoopPeel` can have a possible overflow with the `EstimatedTripCount`
value, which causes a hang with `opt`. Added
`llvm::checkedAddUnsigned()` to prevent this, along with a new
regression from the IR reproducer of #173169.



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