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Rust's standard library on the GPU

GPU code can now use Rust's standard library. We share the implementation approach and what this unlocks for GPU programming.

This works because of our custom hostcall framework. A hostcall is analogous to a syscall. A hostcall is a structured request from GPU code to the host CPU to perform something it cannot execute itself. You can think of it like a remote procedure call from the GPU to the host to achieve syscall-like functionality.

To end users, Rust's std APIs appear unchanged and act as one would expect.