[all-commits] [llvm/llvm-project] b09b05: [MemCpyOpt] Fix clobber check in fca2memcpy optimi...

[Nikita Popov via All-commits]

  Branch: refs/heads/release/20.x
  Home:   https://github.com/llvm/llvm-project
  Commit: b09b05b8e7c392428baaaf6bcaa8c85ce798ef72
      https://github.com/llvm/llvm-project/commit/b09b05b8e7c392428baaaf6bcaa8c85ce798ef72
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2025-03-13 (Thu, 13 Mar 2025)

  Changed paths:
    M llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
    M llvm/test/Transforms/MemCpyOpt/fca2memcpy.ll

  Log Message:
  -----------
  [MemCpyOpt] Fix clobber check in fca2memcpy optimization

This effectively reverts #108535. The old AA code was looking for
the *first* clobber between the load and store and then trying to
move all the way up there. The new MSSA based code instead found
the *last* clobber. There might still be an earlier clobber that
has not been accounted for.

Fixes #130632.

(cherry picked from commit 5da9044c40840187330526ca888290a95927a629)



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