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Support for CUDA 12.0 (libnvvm 2.0) #100
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- added a commit that references this issue
on Nov 9, 2023 - added a commit that references this issue
on Jan 27, 2025 We've just finished updates to a more recent rust toolchain. In my workspace, I've been using 12.8 with libnvvm 2.0, and have changed the line here to bypass that check 🤣
I'm not sure what issues this might cause with either the codegen or the cust/cuda crates today, but for now it seems to "just work".
Here is the change log: https://docs.nvidia.com/cuda/nvvm-ir-spec/index.html#revision-history
It doesn't look the libnvvm API was breaking, and I don't think there is any case where we can generate multiple versions concurrently. We don't appear to support the addresspace intrinsics they removed, and there is a reference to addrspacecast in the codebase which is what they suggest using. We don't support pragma unroll, which changed in 2.0.
The only one I am concerned about is:
Shared variable initialization with non-undef values is no longer supported. In 1.x versions these initializers were ignored silently. This feature makes the 2.0 version incompatible with 1.x versions.
But I doubt it would be an issue unless you are mixing and matching.
So let's closed this as fixed and deal with any issues in follow-up bugs 🚀
Hello.
I just upgraded to CUDA 12.0 and I am getting the following error in
cuda_builder:This seems to be because CUDA 12.0 uses libnvvm 2.0, which is incompatible with version 1 1 2, and the version check fails.
Is there any plan to support CUDA 12.0? Thanks in advance!
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Footnotes
https://docs.nvidia.com/cuda/cuda-toolkit-release-notes/index.html ↩
https://docs.nvidia.com/cuda/nvvm-ir-spec/index.html ↩