I worked for spectral compute a few years ago. Very smart and capable technical team. At the time, not only did they target AMD (with less compatibility than t

I worked for spectral compute a few years ago. Very smart and capable technical team. At the time, not only did they target AMD (with less compatibility than they have now), but also outperformed the default LLVM ptx backend, and even NVCC, when compiling for Nvidia GPUs!