Hi Vincent, > However, IF the function is inlined, no copying should actually take > place because the arg is not modified within the function. My guess is > that [#1] these will produce identical code. Is the context C++ or C? For C++, that [#1] is incorrect for non-regular types, and likely incorrect for regular types. (But for C++ you probably should use a const& for the inline function's parm, which would do what you want.) For C, I'm not sure, but I suspect that [#1] is incorrect. What happens when you test compile the two variants with --save-temps and -O2, and look at the resulting .s files? HTH, --Eljay
