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Hi Qi, No, we don’t have loop fusion. The loop fusion transformation itself is easy, but the profitability and legality checks are challenging. For legality, you would need to analyze the memory that you access and figure out that it is legal to fuse the loops. For profitability you would need to predict the effect on performance. You would need to predict register pressure and resource

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