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I saw a talk by Matt Godbolt demoing the compiler explorer showing showing the assembly between idiomatic C++ vs someone trying to outsmart the compiler. In all

I saw a talk by Matt Godbolt demoing the compiler explorer showing showing the assembly between idiomatic C++ vs someone trying to outsmart the compiler. In all cases the idiomatic version was superior in performance and readability / maintainability.

s3cur3 6y ago
Link to the (great) CppCon talk: https://www.youtube.com/watch?v=bSkpMdDe4g4 https://www.youtube.com/watch?v=bSkpMdDe4g4 The one thing I would say is: as you dig more into C++ perf, you can develop an intuition for the kinds of things the compiler can and can't optimize. For instance, the C++ example from the article uses `std::unordered_map`, which is just an absolute mess from a cache locality perspective—the best compilers today (or of the foreseeable future) can't do a thing to fix that. Improving the programmer's choice of data structure is just not on the radar. :(