arsenm wrote:

> > This probably should retain separate wave32/wave64 builds. Additionally, 
> > should have extension points for subtarget specific implementations
> 
> That's what Shilei was talking about since we have `__nvvm_reflect` for that 
> for NVPTX.

First I will always consider NVVM reflect a giant hack. NVVM reflect cannot 
actually deal with the full range of wavesize issues. It is an incompatible ABI 
and the code should never be intermixed 

https://github.com/llvm/llvm-project/pull/119091
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