[all-commits] [llvm/llvm-project] 069624: LowerMemIntrinsics: Check address space aliasing f...

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0696240384cf4b18f65e31d68b51df96c328cb24
      https://github.com/llvm/llvm-project/commit/0696240384cf4b18f65e31d68b51df96c328cb24
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2023-06-14 (Wed, 14 Jun 2023)

  Changed paths:
    M llvm/lib/Transforms/Utils/LowerMemIntrinsics.cpp
    M llvm/test/CodeGen/AMDGPU/lower-mem-intrinsics.ll

  Log Message:
  -----------
  LowerMemIntrinsics: Check address space aliasing for memmove expansion

For cases where we cannot insert an addrspacecast, we can still expand
like a memcpy if we know the address spaces cannot alias. Normally
non-aliasing memmoves are optimized to memcpy, but we cannot rely on
that for lowering. If a target has aliasing address spaces that cannot
be casted between, we still have to give up lowering this.