[LLVMdev] Future of the LLVM OpenMP runtime

[Rick Mann]

On Feb 25, 2014, at 16:32 , Alp Toker <alp at nuanti.com> wrote:

> 
> On 25/02/2014 23:58, Rick Mann wrote:
>> On Feb 25, 2014, at 15:13 , Alp Toker <alp at nuanti.com> wrote:
>> 
>>> Now that we've kick-started the LLVM OpenMP runtime discussion, I want to make a concrete proposal to get a test suite up and running for the LLVM OpenMP runtime. I don't think the current setup as an LLVM subproject is sustainable going forward without some form of testing support, automated or otherwise.
>> ...
>>> Alp.
>> I work at a small start up that writes a lot of computationally-intensive code. The guys who work on that use OpenMP, but they're primarily targeting our Linux-based servers, and typically build with GCC. However, a big chunk of that code also goes into the iOS app that I'm responsible for, and thus OpenMP support is very much something we desire.
>> 
>> Using macros that either use OpenMP or GCD, we addressed our biggest hot spots, but only for a very particular class of OpenMP constructs. I'd love to see it fully integrated into Xcode.
> 
> Hi Rick,
> 
> Keep in mind that LLVM integration doesn't imply or even indicate Xcode support, but you're right, pulling things together is a step in the right direction. Achieving a complete stack is likely to encourage the ongoing effort towards OpenMP language support in the clang frontend as well.

Absolutely. I added that note to make it clear that the exercise is academic until I can use it in Xcode, although it is possible to point Xcode at another version of clang, which may or may not be sustainable on this team.

> 
>> 
>> Not sure how much I can help, but if you want me to try to build our stuff with it as it moves forward, let me know. Mostly I just wanted to voice my support for the effort.
>> 
> 
> As for trying it out, I suspect the infrastructure isn't quite there yet to respond to bug reports if you hit issues (no bugs reports or fixes have been made yet since the runtime project launched) but James Cownie might be able to answer better.
> 
> It's easy to build and there haven't been success/failure reports in public yet so sure, if you have a minute to try the runtime with gcc or icc that could be useful!

I think you're saying to build the LLVM OpenMP runtime, but build our code with gcc and link against the LLVM OpenMP runtime instead of the default runtime from GCC/Intel? If you can point me at documentation on how to do this, I'll see what I can do.


-- 
Rick



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