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> Why this infrastructure is so tightly coupled with CUDA?

It's not. It uses LLVM, which can easily target AMD GPUs. (Whether the Julia folks have invested in making this work, I dunno, but it's not Extremely Hard.)

Understandably nvidia gives you the wrong impression.

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We are indeed interested in targeting AMD GPUs. There is a prototype backend available at https://github.com/JuliaGPU/AMDGPUnative.jl and we are closely following the status of SPIR-V and Intel GPUs in LLVM.

The focus on CUDA comes from the fact that most HPC systems for scientific computing are using Nvidia GPUs. That is finally slowly changing.

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