ROCm-OpenCL-Runtime

Its not that they're supporting buggy code, they just downgraded the quality of their implementation significantly. They made the compiler a lot worse when they swapped to rocm https://github.com/RadeonOpenCompute/ROCm-OpenCL-Runtime/iss... is the tracking issue for it filed a year ago, which appears to be wontfix largely because its a lot of work OpenCL still unfortunately supports quite a few things that vulkan doesn't, which makes swapping away very difficult for some use cases

Which AMD cards though? It's one thing to be able to buy AMD hardware for your data center or workstations, but as far as I can see their latest consumer platform RDNA2 doesn't support ROCm [0]. Radeon DNA doesn't support Radeon Open Compute. ROCm have never supported Windows, and it doesn't look like there are any future plans for it either. And when looking at which AMD cards support SPIR or SPIR-V I can't find any good list, but I do find issues where AMD removed support in the drivers and told people to use old drivers if they needed it [1]. Compare to Nvidia where you can use any Geforce card you can find, so if you have a Nvidia GPU you know Cuda will work. If you control your own hardware and software stack maybe an AMD CDNA card is fine, but if you want to ship software to end users it seems to be difficult to even know what will

I can confirm I don't have that installed. I'm using this: https://github.com/RadeonOpenCompute/ROCm-OpenCL-Runtime Edit: actually Blender performance is decent, but the kernels take ~10 minutes to compile.