[LLVMdev] Enabling vectorization with LLVM 3.3 for a DSL emitting LLVM IR

[Stéphane Letz]

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

Stéphane Letz