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This means we could write numerical code in Go and get auotvectorized assembly and use GPUs via the nvptx backend. Neat!

Go is a GC language. Only a strict subset would be amenable to running on a GPU.

There's no reason GC couldn't work on GPUs. No one just has bothered implementing it yet.

Yeah, and a GPU could also just happen to give you the right answer in an O(1) hashtable lookup

If you noticed, I did say numerical algorithms, for most of which it's usually easy to allocate memory in advance.

I didn't mean anyone would want to do this but just that it's an interesting parallelism for a language.