[llvm-branch-commits] [llvm] AMDGPU: Expand flat atomics that may access private memory (PR #109407)

[Matt Arsenault via llvm-branch-commits]

arsenm wrote:

> Is it legal and defined behavior to target private memory with an atomic?

In the IR it would have to be, and this is the expected behavior in OpenMP and C++. It's UB in OpenCL, and UB in CUDA/HIP for old style atomics, but defined for new std::atomic style cases 


https://github.com/llvm/llvm-project/pull/109407