On Tuesday, 27 March 2018 at 21:52:25 UTC, Rubn wrote:
It happens with LDC too, not sure how it would be able to know to do any kind of optimization like that unless it was able to inline every single function called into one function and be able to do optimize it from there. I don't imagine that'll be likely though.
It does it in your code sample with `-O`, there's no call to bar and the foo() by-value arg is memcpy'd to the global.
If you compile everything with LTO, your code and all 3rd-party libs as well as druntime/Phobos, LLVM is able to optimize the whole program as if it were inside a single gigantic 'object' file in LLVM bitcode IR, and is thus indeed theoretically able to inline *all* functions.
