[LLVMdev] loop fusion in LLVM

[Tobias Grosser]

On 11/12/2013 05:39 PM, Qi Liao wrote:
> Hi,
>
> I am a student and my team is trying to identify a suitable topic for our
> compiler class final project. The requirement is to implement some
> optimization in LLVM that is not already existed, at least not in the list
> of standard opt that LLVM already has. We are looking at loop fusion as a
> potential candidate topic. Since we are all new to LLVM we would like to
> ask for experts' opinions here if there already is a well known
> implementation of loop fusion pass existed, and if not, is there a
> particular reason that it is not done given such optimization is fairly
> standard?
>
> Thank you.

Hi Qi,

regarding loop fusion and other high-level loop transformations,
http://polly.llvm.org may also be of help. The default scheduling 
optimizer we use has some heuristics for loop fusion, but it does not 
yet take into account register pressure.

Cheers,
Tobias