Re: [xine-devel] FAQ and gcc versions...

[<bar...@t-...>]

hi michel,

On Tue, 4 Jun 2002, Michel LESPINASSE wrote:

> This is what I added in my acinclude.m4 to do the detection:
>
> dnl AC_C_ALWAYS_INLINE
> dnl Define inline to something appropriate, including the new always_inline
> dnl attribute from gcc 3.1
> AC_DEFUN([AC_C_ALWAYS_INLINE],
>     [AC_C_INLINE
>     if test x"$GCC" = x"yes" -a x"$ac_cv_c_inline" = x"inline"; then
>         AC_MSG_CHECKING([for always_inline])
>         SAVE_CFLAGS="$CFLAGS"
>         CFLAGS="$CFLAGS -Wall -Werror"
>         AC_TRY_COMPILE([],[__attribute__ ((__always_inline__)) void f (void);],
>             [ac_cv_always_inline=yes],[ac_cv_always_inline=no])
>         CFLAGS="$SAVE_CFLAGS"
>         AC_MSG_RESULT([$ac_cv_always_inline])
>         if test x"$ac_cv_always_inline" = x"yes"; then
>             AC_DEFINE_UNQUOTED([inline],[__attribute__ ((__always_inline__))])
>         fi
>     fi])

daniel - at least to me this looks like that magci stuff you always take
care of? ;>

> > have you also experimented with all those -funroll... optimization
> > directives? without having looked into it any further i could at least
> > imagine some of them to be counter-productive with gcc 3.1
>
> I havent looked too much... libmpeg2 only uses quite simple
> optimization flags though (-O3 -fomit-frame-pointer -mcpu=pentiumpro)

humm - i remember i once started with stolen mpeg2dec optimization
directives back when it was still maintained by aaron - guess this is
really something to work at again.

maybe i should try exactly these cflags as well ... but doesn't the gcc
have new optimization flags - something related to profiler based
optimizations?

cheers,

   guenter


--
time is a funny concept