Looping Through LLVM's New Loop Vectorizer
Premiering with LLVM 3.2, which will debut later this month, is an automatic loop vectorizer. I've already delivered benchmarks of LLVM's new automatic loop vectorizer, but here's more details on this new LLVM compiler feature.
The LLVM Loop Vectorizer is the second vectorizer for the compiler infrastructure after its Basic Block Vectorizer for dealing with straight-line code. The Loop Vectorizer is meant to widen instructions in an original loop for operating on multiple consecutive loop iterations. As mentioned in the earlier Phoronix articles on the subject, this feature isn't enabled by default with the forthcoming LLVM 3.2 but can be flipped on via the -mllvm -vectorize-loops compiler switches.
On the LLVM Blog is a new posting from yesterday that goes into detail about LLVM's Loop Vectorizer. The posting also mentions that for the LLVM 3.3 release in 2013 they will be aiming to have this vectorizer enabled by default. The blog post covers a few examples of how LLVM can now vectorize different complex loops.
The post also shares that there's more work going forward:
Read about this new LLVM 3.2 feature at blog.llvm.org. Also to be found in this month's LLVM/Clang/DragonEgg 3.2 release is better PowerPC compiler support, Polly improvements, and much more.
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