[LLVMdev] [cfe-dev] How to detect and work on OpenMP pragmas in llvm /clang

[Hal Finkel]

----- Original Message -----
> From: "techie tawa" <techie.tawa at gmail.com>
> To: "llvmdev" <llvmdev at cs.uiuc.edu>, "cfe-dev" <cfe-dev at cs.uiuc.edu>
> Sent: Friday, March 14, 2014 5:38:51 AM
> Subject: [cfe-dev] How to detect and work on OpenMP pragmas in llvm /clang
>
> Hi,
> 
> I'm trying to work on transform passes in LLVM aimed at every OpenMP
> parallel section which are mentioned using 'omp pragmas'.
> 
> I'm thinking something like: Module level, Function level and basic
> block level, can I write any passes at a parallel loop level. If
> yes, any directions on this would be really helpful.

Because OpenMP is 'outlined' early -- specifically all pragmas are turned into calls to the runtime library in the frontend -- we don't have any particular infrastructure for this in LLVM. You'd need to run a pass to look at calls to the OpenMP runtime and then go from there. If you can provide further details about what you'd like to accomplish, then I might be able to provide more specific advice.

 -Hal

> 
> Cheers.
> 
> chris
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-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory