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Hi Nikita, Glad to hear that Rust code can benefit a lot from this. I have put patches to enable merge-similar functions with thinLTO. https://reviews.llvm.org/D52896 etc. <https://reviews.llvm.org/D52896> This is more powerful than existing merge-functions pass and all we need to do is port these patches to trunk llvm. I'd be happy to help with this effort. -Aditya