> The `inline` keyword usually isn't necessary anymore to get the compiler to inline stuff, the compiler has some pretty good heuristics for determining whether

> The `inline` keyword usually isn't necessary anymore to get the compiler to inline stuff, the compiler has some pretty good heuristics for determining whether to inline a function call or not. Not really. The heuristics are pretty much based on a rough idea of function size (e.g. if it believes the call overhead is larger than just inlining the function, it will generally always be done if optimization is on), and/or functions it can prove is used only once (e.g. because they are static). That's it. There's no good idea of e.g. “this looks like a tight loop, and if I inline, I can maybe special-case away this cruft here”. The programmer's hints are very much relevant even in 2022.