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> Existing no_std + no alloc crates written for other purposes can generally run on the GPU without modification.

Wow. That at first glance seems to unlock ALOT of interesting ideas.

I guess performance would be very different if things were initially assumed to run on a cpu

I think it could be improved a lot by niche optimization passes on the codegen backend. Kinda like the autovectorization and similar optimizations on the CPU backends.

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