[llvm] AMDGPU/GFX12: Do not wait unnecessarily before barriers (PR #154970)

Pierre van Houtryve via llvm-commits llvm-commits at lists.llvm.org
Mon Aug 25 00:18:55 PDT 2025


Pierre-vh wrote:

> I have a slight concern that this could trigger the same kind of problems we have seen on GFX10 and GFX11, which we worked around by removing FeatureBackOffBarrier from them. But if not then this seems fine to me.

It likely can cause the exact same issue on gfx12, seeing as we had to also disable the BackOffBarrier on downstream for that target. I am working on a proper fix for GFX10/11/12 which will allow us to reenable BackOffBarrier.

https://github.com/llvm/llvm-project/pull/154970


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