Re: [Mingw-users] A simple question for WinAPI programmers.

[Jeff S. <jef...@ap...>]

Georg Fusz wrote:
> _stdcall tells that this functions get its parameter in pascal or fortran style.

Fortran?  I don't think that is the case, at least for g77.  A quick
assembly dump reveals the caller pop (actually an "addl" insn):

        pushl $1
        movl 8(%ebp),%eax
        pushl %eax
        call _f_
        addl $16,%esp

I have no idea about Pascal.  (Last time I touched that language I doubt
I cared about calling conventions...)

> This calling convention works a little bit quicker than the C-Style.

You think?  With either callee pop or caller pop the instruction count
is about the same, I'd guess.
 
Gcc has a optimization, -fdefer-pop, which sometimes merges pops from
consecutive subroutine calls, saving an instruction or two.  It is
ineffective with stdcall.

Jeff