Hello, Gordon.> think there is special support in the LLVM assembly language for these > two.Yes, afair - x86_stdcallcc and x86_fastcallcc> Note that fastcc / CallingConv::Fast is not fastcall. (It's actually > an alias for ccc...)No, at least on x86. -- With best regards, Anton Korobeynikov. Faculty of Mathematics & Mechanics, Saint Petersburg State University.