[all-commits] [llvm/llvm-project] f98bdd: Reapply "[LoopPeel] Remove known trip count restri...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f98bdd94e61721ebe11108956e63510692db34b2
      https://github.com/llvm/llvm-project/commit/f98bdd94e61721ebe11108956e63510692db34b2
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-05-28 (Wed, 28 May 2025)

  Changed paths:
    M llvm/include/llvm/Transforms/Utils/LoopPeel.h
    M llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
    M llvm/lib/Transforms/Utils/LoopPeel.cpp
    M llvm/test/Transforms/LoopUnroll/peel-last-iteration-expansion-cost.ll
    M llvm/test/Transforms/LoopUnroll/peel-last-iteration-with-constant-trip-count.ll
    M llvm/test/Transforms/LoopUnroll/peel-last-iteration-with-variable-trip-count.ll
    M llvm/test/Transforms/LoopUnroll/unroll-and-peel-last-iteration.ll

  Log Message:
  -----------
  Reapply "[LoopPeel] Remove known trip count restriction when peeling last. (#140792)"

This reverts commit 580454526b936f7a576ddbc9bb932cf9be376ec4.

The recommitted version contains an extra check to not peel if the
latch exit is controlled by a pointer induction.

Original message:
Remove the restriction that the loop must be known to execute at least 2
iterations when peeling the last iteration. If we cannot prove at least
2 iterations are executed, a check and branch to skip the peeled loop is
inserted.

PR: https://github.com/llvm/llvm-project/pull/140792



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications