[llvm-dev] LLVM and parallelization

[Mehdi Amini via llvm-dev]

> On Jan 12, 2016, at 9:20 AM, Iulia Stirb via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> Hi Hal,
> 
> Thank you for the answer.
> 
> I tried to compile using Polly (clang -O3 -mllvm -polly -mllvm -polly-parallel -lgomp) but I get an warning saying polly argument is not used.

You need to build clang *with Polly*: http://polly.llvm.org/example_load_Polly_into_clang.html

— 
Mehdi


> 
> What do you mean when you say it has experimental support for (1) in the Polly project? Is (1) already implemented in clang and available for users?
> 
> Regards,
> Iulia
> 
> 
> On Wednesday, December 16, 2015 10:42 PM, Hal Finkel <hfinkel at anl.gov> wrote:
> 
> 
> ----- Original Message -----
> > From: "Iulia Stirb via llvm-dev" <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>>
> > To: llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>
> > Sent: Wednesday, December 16, 2015 9:28:54 AM
> > Subject: [llvm-dev] LLVM and parallelization
> > 
> > Hi,
> > 
> > 
> > I know LLVM provides t hread-level automatic parallel support using
> > OpenMP (see http://blog.llvm.org/2015/05/openmp-support_22.html  <http://blog.llvm.org/2015/05/openmp-support_22.html>),
> > but it is not clear for me which of the following is correct?
> > 
> > 
> > 1. Clang inserts in the source code OpenMP compiler directives, so,
> > it auto-parallelizes the serial source code provided as input or
> > 2. Clang can compile manually written parallel source code that uses
> > OpenMP directives
> 
> Thus far, only (2). There is, however, experimental support for (1) in the Polly project.
> 
> -Hal
> 
> 
> > 
> > Best regards,
> > Iulia Stirb
> 
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev <http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev>
> > 
> 
> -- 
> Hal Finkel
> Assistant Computational Scientist
> Leadership Computing Facility
> Argonne National Laboratory
> 
> 
> 
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