[llvm-dev] Status of CUDA 11 support

[Artem Belevich via llvm-dev]

On Thu, Jul 30, 2020 at 2:34 PM Igor Sugak <sugak at fb.com> wrote:

> I work in a large CUDA codebase and use Clang to build some of our CUDA
> code to improve compilation speed. We're planning to upgrade to CUDA 11
> soon, and it appears that CUDA 11 is not yet supported in LLVM.
>
> From the LLVM commits history, I can see that work on CUDA 11 has started.
> Is this currently being worked on? What is the remaining work left? And is
> any help needed to finish it?
>

Clang works with CUDA-11 with feature parity with CUDA-10.1. I.e. whatever
code clang was able to compile w/ CUD-10.1 it should still be able to
compile w/ 11.0.
It supports targeting new GPUs supported by newer CUDA versions, but
currently lacks support for the new instruction variants and
corresponging LLVM intrinsics and clang builtins (hence the warning, which
can be disabled).

In the past addition of new features was driven by the practical need for
them and there's been little demand for the new bells and whistles. Most of
the TensorCore cycles are spent in NVIDIA's own cuBLAS/cuDNN precompiled
libraries these days with little to no compileable source code
that needs to support TensorCores.

Do you have the list of specific CUDA features that you need clang to
support?

-- 
--Artem Belevich
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