[llvm-branch-commits] [llvm] [AMDGPU] Disable VALU sinking and hoisting with WWM (PR #123124)

[Stanislav Mekhanoshin via llvm-branch-commits]

rampitec wrote:

> I guess my concern is performance regressions if any use of WWM (e.g. atomic optimizer) essentially turns off Machine LICM.

I agree. But when moving the code llvm thinks it is something cheap, and its is not, which is also a performance problem. Things would be much easier if we could tell an instruction belongs to a WWM region.

https://github.com/llvm/llvm-project/pull/123124