[all-commits] [llvm/llvm-project] 8cb9c7: [LoopIdiom] Keep TBAA when creating memcpy/memmove

[William Moses via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8cb9c7360944b1e4dd2e8125a48ede3628b459f1
      https://github.com/llvm/llvm-project/commit/8cb9c7360944b1e4dd2e8125a48ede3628b459f1
  Author: William S. Moses <gh at wsmoses.com>
  Date:   2022-01-31 (Mon, 31 Jan 2022)

  Changed paths:
    M llvm/include/llvm/IR/Metadata.h
    M llvm/lib/Analysis/TypeBasedAliasAnalysis.cpp
    M llvm/lib/Transforms/Scalar/LoopIdiomRecognize.cpp
    A llvm/test/Transforms/LoopIdiom/memcpy-tbaa.ll
    A llvm/test/Transforms/LoopIdiom/memmove-tbaa.ll
    A llvm/test/Transforms/LoopIdiom/memset-tbaa.ll

  Log Message:
  -----------
  [LoopIdiom] Keep TBAA when creating memcpy/memmove

When upgrading a loop of load/store to a memcpy, the existing pass does not keep existing aliasing information. This patch allows existing aliasing information to be kept.

Reviewed By: jeroen.dobbelaere

Differential Revision: https://reviews.llvm.org/D108221