Any real use case for using the calling convention fastcall?

Question

Have you had any real use case for using the calling convention fastcall?

Thanks.

Answer 1

Here's an article explaining when to use fastcall. It actually specifies a case when you actually have no alternative but to use it:

Some VCL classes, such as TList, allow you to specify a callback function (a sort routine in the case of TList). You will have to use the __fastcall keyword in this case, too, as the VCL expects it.