[MPlayer-dev-eng] mencoder very slow on x86-64 architecture

[Martin Jungowski]

Hi,

I also tried CVS (sorry, forgot to mention it in my first post) - didn't
work. And yes, the AMD Opteron microprocessor does run IA32 code in
either legacy mode (that is when booting a 32-bit Kernel - you can only
run 32-bit apps) or compatibility mode (that is when booting a 64-bit
Kernel - you can run 64-bit apps in long-mode and 32-bit apps in
compatibility mode) without any required flags/settings whatsoever.

And even if the MMX & SSE options are written for 32-bit x86 shouldn't
they at least compile for 64-bit x86 software? There's absolutely no
difference between SSE/SSE2/MMX/MMXEXT for 32-bit CPUs and
SSE/SSE2/MMX/MMXEXT for 64-bit CPUs - nothing at all, the registers,
µOps and everything else stays the same hence it should work, don't you
think?

Oh and thanks for the /libavcodec/i386/cputest.c hint, I'm gonna give
that a shot and tell whether it helped.

Martin





On Sun, 2003-07-27 at 13:46, Arpi wrote:
> Hi,
> 
> > In order to bench an x86-64 computer I installed SuSE x86-64 and
> > compiled mplayer 0.90. The problem is though, that mencoder doesn't seem
> > to recognize the CPU hence does not enable MMXEXT for IDCT transform and
> > motion compensation.
> 
> does x86-64 able to run x86-i686 32-bit assembly code at all (without extra
> prefixing)? the mmx/sse/etc optioms in mencoder/libavcodec are all written
> for 32bit x86 platform.
> 
> > I have tried everything, rewriting cpudetect and cputable, the Makefile,
> 
> lol
> you should check libavcodec/i386/cputest.c too
> 
> btw why dont you try&patch mplayer cvs isntead? that way you could send
> patches back and getting them into next releases. 0.90 is quite old and
> buggy.
> 
> > IDCT and motion compensation. I'd appreciate any help since mencoder is
> > one of the most important benchmarks on that 64-bit platform.
> 
> lol
> 
> 
> A'rpi / Astral & ESP-team
> 
> --
> Developer of MPlayer G2, the Movie Framework for all - http://www.MPlayerHQ.hu
> 
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