[FFmpeg-devel] [PATCH] ppc: replace vec_ld(0), vec_ld(1) by VEC_LD2() which has fewer loads

[Michael Niedermayer]

On Fri, Nov 14, 2014 at 06:45:55AM -0700, Pavel Koshevoy wrote:
> On Nov 13, 2014 4:15 PM, "Michael Niedermayer" <michaelni at gmx.at> wrote:
> >
> > On Fri, Nov 07, 2014 at 03:12:19PM +0100, Michael Niedermayer wrote:
> > > This needs to be benchmarked, i do not have ppc hw
> > > This is on big endian more similar to how the code was before
> 79e0255956bc8fcdb143f39b2e45db77144ac017
> > >
> > > Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> >
> > ping
> >
> > can someone with a altivec PPC please benchmark this
> > or do all the ppc people want code to be slow and unoptimized ?
> > iam also happy to benchmark it myself if someone provides a ppc or
> > account on a altivec ppc that is reasonable idle so benchmarking is
> > possible with some accuracy
> >
> 
> I can do it over the weekend, I have a ppc G4 800MHz iMac.  I'll need
> instructions on what to do for benchmarking.

patch that adds benchmarking is below
that and trying to decode some mpeg2 like with
 -v 99 -i matrixbench_mpeg2.mpg -f null -

should result in some timing values
i cant say for sure though, as this does not work under qemu
under qemu i just get 0


diff --git a/libavcodec/mpegvideo_motion.c b/libavcodec/mpegvideo_motion.c
index e7a585d..94b140d 100644
--- a/libavcodec/mpegvideo_motion.c
+++ b/libavcodec/mpegvideo_motion.c
@@ -976,6 +976,7 @@ void ff_mpv_motion(MpegEncContext *s,
                    op_pixels_func (*pix_op)[4],
                    qpel_mc_func (*qpix_op)[16])
 {
+    START_TIMER
 #if !CONFIG_SMALL
     if (s->out_format == FMT_MPEG1)
         mpv_motion_internal(s, dest_y, dest_cb, dest_cr, dir,
@@ -984,4 +985,5 @@ void ff_mpv_motion(MpegEncContext *s,
 #endif
         mpv_motion_internal(s, dest_y, dest_cb, dest_cr, dir,
                             ref_picture, pix_op, qpix_op, 0);
+    STOP_TIMER("MC")
 }



> 
>     Pavel
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> ffmpeg-devel at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> 

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

I have often repented speaking, but never of holding my tongue.
-- Xenocrates
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