[llvm-dev] Split llvm ir

[Wehrli Johan via llvm-dev]

Hi,

> Can someone clarify, is it possible to get the size at llvm ir level of function and how to split it without affecting functionality of splitted function.

What size are you talking about? The number of IR instruction?

Some time ago, I was working on something similar (maybe my information can be outdated…).

You can look at the CodeExtractor class and the method extractCodeRegion.

This can help you identifie the part of the function you can split.

You can get the Region by adding the following method to your class:

void getAnalysisUsage(AnalysisUsage &AU) const {
  AU.addRequired<RegionInfoPass>();
}

and you get the region with RegionInfo* RI = &getAnalysis<RegionInfoPass>(*f).getRegionInfo();

Good luck,

Johan
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