The New Pass Manager
https://blog.llvm.org/posts/2021-03-26-the-new-pass-manager/
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LLVM’s New Pass Manager What is a pass manager? A pass manager schedules transformation passes and analyses to be run on IR in a specific order. Passes can run on an entire module, a single function, or something more abstract such as a strongly connected component (SCC) in a call graph or a loop inside of a function.