Sorry I don't recall offhand. It was definitely Chandler Carruth who mentioned this, and he has a handful of videos on YouTube from CppCon. They are all worth

Sorry I don't recall offhand. It was definitely Chandler Carruth who mentioned this, and he has a handful of videos on YouTube from CppCon. They are all worth watching if you care about such things :) I don't know the details but I'm fairly sure that the issue is that move constructors in C++11 made small size optimization impossible in some cases. I think he works on the LLVM optimizer so that would be a primary source and not hearsay.