kuhar wrote:

> High level question: I don't understand why you call this a "gather" 
> operation. What do you mean by that? Isn't it semantically just a memcpy, or 
> a (global/buffer) load followed by a (LDS) store?

This is more like a subgroup operation because the destination offset is 
uniform.

https://github.com/llvm/llvm-project/pull/137425
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