News Summary

• Maybe it’s inlining the methods, making the code larger, filling up the code cache memory> Final isn’t really a performance optimization for a modern compiler.
• It promises a way to speed up object-oriented code by omitting the vtable call indirection by marking a class or member function as – unsurprisingly – final, meaning that it cannot be inherited from or overridden.
• (without virtual, any function is final)Simple case: https://godbolt.org/z/ja8rbj8Wd Remove the final, and notice the difference.Damn I wish I was better at programming.
• Just code without and show intent of no dynamic dispatch and the compiler will automatically generate performant code.Easy and free has nothing to do with performance.
• It’s a single sample point, and even trivial changes can produce quite substantial differences in small benchmarks like this due to unrelated things like code layout moving around and crossing page boundaries, along with all sorts of other factors.
• without final, they have to load the virtual function table, get the virtual function pointer, and then invoke it.