[Openmp-dev] #pragma directives expansion

[Millad Ghane]

Thanks everybody. I really appreciate your responses.

On Thu, Sep 18, 2014 at 5:44 AM, Barbara Chapman <bchapma3 at central.uh.edu>
wrote:

>  BTW the Rose implementation was based on our OpenUH one and done by
> somebody from the UH group. So we have plenty of documentation on that :-)
> Barbara
>
>
> On 9/18/14 4:03 AM, Cownie, James H wrote:
>
>  You need to be clear, though, that the expansions are conceptual and for
> educational purposes. They’re showing what the transformations would look
> like if they were done in source code. However that doesn’t meant that is
> how they are done, in reality they’re transformations on the compiler’s
> intermediate representation. When compiling there is never a file that
> contains the transformed source code.
>
>
>
> They’re shown in the document as if they were source code transformations
> because that’s easy to read and understand, not because that’s what really
> exists.
>
> (If we showed the real internal transformation you would need to
> understand the compiler IR, which isn’t the point of the discussion.)
>
>
>
> If you want an OpenMP implementation that does operate source to source,
> you might look at Rose. http://rosecompiler.org/ (Disclaimer, I haven’t
> looked at it in detail, but it seems to claim to have an OpenMP
> implementation). I doubt that it targets this runtime, though…
>
>
>
> -- Jim
>
> James Cownie <james.h.cownie at intel.com> <james.h.cownie at intel.com>
> SSG/DPD/TCAR (Technical Computing, Analyzers and Runtimes)
>
> Tel: +44 117 9071438
>
>
>
> *From:* openmp-dev-bounces at cs.uiuc.edu [
> mailto:openmp-dev-bounces at cs.uiuc.edu <openmp-dev-bounces at cs.uiuc.edu>] *On
> Behalf Of *Alexander Musman
> *Sent:* Thursday, September 18, 2014 4:07 AM
> *To:* daniel tian
> *Cc:* openmp-dev at dcs-maillist2.engr.illinois.edu; HPCTools Group
> *Subject:* Re: [Openmp-dev] #pragma directives expansion
>
>
>
> You can also have a look at http://openmp.llvm.org/Reference.pdf - it
> contains several examples of how different OpenMP directives are expanded.
>
>
>
> 2014-09-17 22:47 GMT+04:00 daniel tian <xtian2 at uh.edu>:
>
> The parallel region will be outlined as a function. This function will be
> run by each threads. You can take a look at our group's Wikipedia page
> regarding the OpenMP implementation in OpenUH.
>
>
>
> Also you can take a look at Liao's paper: *OpenUH*: An optimizing,
> portable *OpenMP* compiler
> <http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.190.7005>
>
>
>
> On Wed, Sep 17, 2014 at 1:15 PM, Millad Ghane <millad.mg at gmail.com> wrote:
>
> Hello everyone,
>
>
>
> I know that an OpenMP #pragma directive is expanded into some lines of
> codes (or maybe I am wrong). I was hoping if someone could tell me where
> should I look for it?
>
>
>
> For example, considering this piece of code:
>
> #pragma omp parallel
>
> {
>
>   printf("Hello world! %d", omp_get_thread_num());
>
> }
>
>
>
> will be converted to something like this:
>
> f1();
>
> {
>
>   printf("Hello world! %d", omp_get_thread_num());
>
> }
>
> f2();
>
>
>
>
>
> If I am wrong tell me.And if you know where should I look for in the code,
> let me know about it.
>
>
>
>
>
> Best Regards,
>
> Millad
>
>
>
>
>
>
>
>
>
> --
>
> Best Regards,
>
> Xiaonan (Daniel) Tian
>
>
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> --
>
> Barbara Chapman, Professor and Director
> Center for Advanced Computing & Data Systems
> University of Houston
> A Carnegie-designated Tier One public research University713-743-3354 officechapman at cs.uh.edu
>
>
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