[all-commits] [llvm/llvm-project] 9a45e4: [MemCpyOpt] Move lifetime marker before call to en...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9a45e4beede24fdcd6b7d95416d0447ba154651c
      https://github.com/llvm/llvm-project/commit/9a45e4beede24fdcd6b7d95416d0447ba154651c
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2022-11-07 (Mon, 07 Nov 2022)

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

  Log Message:
  -----------
  [MemCpyOpt] Move lifetime marker before call to enable call slot optimization

Currently call slot optimization may be prevented because the
lifetime markers for the destination only start after the call.
In this case, rather than aborting the transform, we should move
the lifetime.start before the call to enable the transform.

Differential Revision: https://reviews.llvm.org/D135886