[LLVMdev] [RFC] OpenMP Representation in LLVM IR

[Krzysztof Parzyszek]

On 10/1/2012 8:06 PM, greened at obbligato.org wrote:
>
> I think this is a bad idea.  OpenMP is not Low Level and I can't think
> of a good reason to start putting OpenMP support in the IR.

OpenMP is as low-level as loop nest optimizations or inlining.  There is 
nothing about it that would make it not fit in the LLVM's model.

As for reasons, here are two:
1. Implementing parallelization directives in the IR would allow 
multiple front-ends to use the same interface to express SMP semantics 
without having each one of them to do the actual implementation.

2. Having the paralellization infrastructure implemented in LLVM would 
allow auto-parallelization to be added at some point without adding a 
new parallelization infrastructure to the optimizer (on top of what the 
front-ends would have already implemented).

-Krzysztof

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