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Hi, Even though this question does not only concern LLVM, it seems that only compilers guru can answer it. So I am giving a try here, hoping for the best. In a recent talk by Chandler Carruth, “Performance with algorithms, efficiency with data structures” ( https://www.youtube.com/watch?v=fHNmRkzxHWs <https://www.youtube.com/watch?v=fHNmRkzxHWs> ), Chandler says that one should never return by reference for efficiency. Although I totally agree with him in most cases because pointers make it difficult for a compiler to optimise, I still don’t always have an efficient solution with value se...