<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jan 26, 2016, at 19:45 , Jordan Rose <<a href="mailto:jordan_rose@apple.com" class="">jordan_rose@apple.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=us-ascii" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Jan 26, 2016, at 18:49 , David Turnbull via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Functions in a module go through dynamic dispatch. Operators are functions. So multiplying two complex numbers won't get inlined. The stdlib uses internal tricks so what appears as a module you import is available to be specialized and inlined.<div class=""><br class=""></div><div class="">To see this in action, try the CubeWorld demo from here: <a href="https://github.com/AE9RB/SwiftGL" target="_blank" style="font-size:13px" class="">https://github.com/AE9RB/SwiftGL</a></div><div class="">Then change it so the math libraries aren't modules (move the files, delete the import statements). On my system, CPU drops from 60% to 6%. It's also the difference between 150 cubes and 1200 cubes at 60 fps. Make sure you turn on WMO.</div><div class=""><br class=""></div><div class="">I'm told it won't always be this way. But it is today.</div></div></div></blockquote><br class=""></div><div class="">Yep. We're planning to improve this but right now it's true: inlining and generic specialization does not happen across framework boundaries.</div></div></div></blockquote><br class=""></div><div>Only the generics are really "dynamic dispatch", though. Non-generic code is just "function calls that aren't inlined".</div><div><br class=""></div><div>Jordan</div><br class=""></body></html>