Optimizing member variable order in C++

Question

I was reading a blog post by a game coder for Introversion and he is busily trying to squeeze every CPU tick he can out of the code. One trick he mentions off-hand is to

Answer 1

I highly doubt that would have any bearing in CPU improvements - maybe readability. You can optimize the executable code if the commonly executed basic blocks that are executed within a given frame are in the same set of pages. This is the same idea but would not know how create basic blocks within the code. My guess is the compiler puts the functions in the order it sees them with no optimization here so you could try and place common functionality together.

Try and run a profiler/optimizer. First you compile with some profiling option then run your program. Once the profiled exe is complete it will dump some profiled information. Take this dump and run it through the optimizer as input.

I have been away from this line of work for years but not much has changed how they work.