[LowLevelMahn]

this Rust demo also uses PTX directly

  During the build, build.rs uses rustc_codegen_nvvm to compile the GPU kernel to PTX.
  The resulting PTX is embedded into the CPU binary as static data.
  The host code is compiled normally.

[LegNeato]

To be more technically correct, we compile to NVVM IR and then use NVIDIA's NVVM to convert it to PTX.

[saagarjha]

That’s not really the same thing; it compiles through PTX rather than using inline assembly.

[LegNeato]

FYI, you can drop down into ptx if need be:

https://github.com/Rust-GPU/Rust-CUDA/blob/aa7e61512788cc702...