llvm dev - Jul 2013 - [LLVMdev] Enabling vectorization with LLVM 3.3 for a DSL emitting LLVM IR

Hi,

For libfaust, perhaps? :)

Could it be something as simple as a target triple defined for the module?  
Without knowledge of the target machine vector width, the vectorizer will  
assume maximum width of 1. You can override this without a triple by using  
the -force-vector-width switch.

Vesa
> Hi,
>
> Our DSL can generate C or directly generate LLVM IR. With LLVM 3.3, we  
> can vectorize the C produced code using clang with -O3, or clang with  
> -O1 then opt -O3 -vectorize-loops. But the same program generating LLVM  
> IR version cannot be vectorized with opt -O3 -vectorize-loops. So our  
> guess is that our generated LLVM IR lacks some informations that are  
> needed by the vectorization passes to correctly work.
>
> Any idea of what could be lacking?
>
> Thanks
>
> St?phane Letz