[all-commits] [llvm/llvm-project] bb10c3: [LoopPeel] Implement initial peeling off the last ...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bb10c3ba7f77d40a7fbfd4ac815015d3a4ae476a
      https://github.com/llvm/llvm-project/commit/bb10c3ba7f77d40a7fbfd4ac815015d3a4ae476a
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-05-15 (Thu, 15 May 2025)

  Changed paths:
    M llvm/include/llvm/Analysis/TargetTransformInfo.h
    M llvm/include/llvm/Transforms/Utils/LoopPeel.h
    M llvm/lib/Transforms/Scalar/LoopFuse.cpp
    M llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
    M llvm/lib/Transforms/Utils/LoopPeel.cpp
    M llvm/test/Transforms/LoopUnroll/peel-last-iteration.ll

  Log Message:
  -----------
  [LoopPeel] Implement initial peeling off the last loop iteration. (#139551)

Generalize countToEliminateCompares to also consider peeling off the
last iteration if it eliminates a compare.

At the moment, codegen for peeling off the last iteration is quite
restrictive and callers have to make sure that the exit condition can be
adjusted when peeling and that the loop executes at least 2 iterations.

Both will be relaxed in follow-ups.

PR: https://github.com/llvm/llvm-project/pull/139551



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