[Ffmpeg-devel] [PATCH] SSE counterpart of ff_imdct_calc_3dn2

[Zuxy Meng]

Hi,

2006/9/19, Guillaume Poirier <gpoirier at mplayerhq.hu>:
> Hi,
>
> Diego Biurrun wrote:
> > On Thu, Sep 14, 2006 at 11:02:48AM +0200, Guillaume POIRIER wrote:
> >
> >>On 9/14/06, Zuxy Meng <zuxy.meng at gmail.com> wrote:
> >>
> >>>2006/9/13, Benjamin Larsson <banan at student.ltu.se>:
> >>>
> >>>>Missing?
> >>>
> >>>I mean the one I sent out last time.
> >>
> >>Well, it still needs -fomit-frame-pointer to get compiled at all, so I
> >>don't think it's good to go, unless we add the requirement that FFmpeg
> >>needs to be compiled with -fomit-frame-pointer.
> >
> >
> > Wasn't this just on your specific gcc version?
>
> No, I've checked with GCC 3.3, 4.0.3, 4.2.x (from svn) and they all
> fail on the same code on IA32.

IIRC another thread has pointed out that even ff_imdct_3dn2.c itself
won't compile without -fomit-frame-pointer....

>
> Note that it works in all cases on AMD64, which is logical as GCC has
> 2x more registers to play with.
>
> I don't know what's the proper way to fix/work around this problem.
> Maybe it would require to disable this code if compiled without
> -fomit-frame-pointer, but I have no idea if GCC defines any symbol
> that would allow to detect this...



-- 
Zuxy
Beauty is truth,
While truth is beauty.
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