arsenm wrote:

> > Do you assume that at this stage there are no accvgpr_write/read 
> > instructions, but only COPY?
> 
> Yes, you should never use those for actual copies. Not using COPY always 
> hurts optimizations

But this only needs to handle the specific patterns produced by SplitKit, which 
always use copy 

https://github.com/llvm/llvm-project/pull/145024
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