llvm dev - Jan 2013 - [LLVMdev] Compiling to NVPTX

I'm in the process of writing a library and giving a talk about writing
compilers using LLVM (llvm-c) and Clojure. As part of my talk I'd like to
give an example of a program running on CUDA.

Are there any papers, tutorials, examples, on writing a custom frontend for
NVPTX? For instance, I'm trying to figure out how to get access to
"global"
variables like blockidx. I know that libc won't be accessible  so I'm
probably just going to give a demonstration of a image blur filter written
in a custom-built programming language

I was going to try simply taking my llvm module and having llvm write out
the object file using the nvptx triple. But to be honest here, I'm just
shooting in the dark at this point.

Any information would be greatly appreciated.

Timothy
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You caught me right as I'm leaving the office, so this reply will be a bit
brief until I have time to write something more lengthy...

Generally, the only conventions you need to follow for simple CUDA kernels
is to use ptx_kernel as the calling convention, and use address space 1 for
global-address pointers.  The generated PTX is consumable by the Driver API
(see CUDA samples for using the Driver API for loading/executing PTX
kernels).

In the near future, I hope to put together a bit of a tutorial on this.  I
am well aware that there is a lack of information here, and I hope to
correct that soon!


On Tue, Jan 22, 2013 at 3:56 PM, Timothy Baldridge <tbaldridge at
gmail.com>wrote:
> I'm in the process of writing a library and giving a talk about writing
> compilers using LLVM (llvm-c) and Clojure. As part of my talk I'd like
to
> give an example of a program running on CUDA.
>
> Are there any papers, tutorials, examples, on writing a custom frontend
> for NVPTX? For instance, I'm trying to figure out how to get access to
> "global" variables like blockidx. I know that libc won't be
accessible  so
> I'm probably just going to give a demonstration of a image blur filter
> written in a custom-built programming language
>
> I was going to try simply taking my llvm module and having llvm write out
> the object file using the nvptx triple. But to be honest here, I'm just
> shooting in the dark at this point.
>
> Any information would be greatly appreciated.
>
> Timothy
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>

-- 

Thanks,

Justin Holewinski
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