[FFmpeg-cvslog] r14698 - in trunk/libavcodec: Makefile dsputil.h fft.c i386/fft_3dn.c i386/fft_3dn2.c i386/fft_mmx.asm i386/fft_sse.c

[Michael Niedermayer]

On Wed, Aug 13, 2008 at 01:15:27AM -0600, Loren Merritt wrote:
> On Tue, 12 Aug 2008, Mike Melanson wrote:
> >> Author: lorenm
> >> Date: Tue Aug 12 02:26:58 2008
> >> New Revision: 14698
> >>
> >> Log:
> >> split-radix FFT
> >> c is 1.9x faster than previous c (on various x86 cpus), sse is 1.6x faster than previous sse.
> >
> > This change broke the WMA v1 encoding test on the following configurations:
> >
> > x86_32 / gcc 4.3.1
> > x86_32 / gcc 4.4.0-SVN
> >
> > The failure looks like this:
> >
> > diff -u -w "/home/melanson/fate/source"/tests/ffmpeg.regression.ref
> > tests/data/vsynth.regression
> > --- /home/melanson/fate/source/tests/ffmpeg.regression.ref
> > 2008-08-08 16:34:02.000000000 -0700
> > +++ tests/data/vsynth.regression        2008-08-12 18:48:02.000000000
> > -0700
> > @@ -205,7 +205,7 @@
> >  353368 ./tests/data/a-flac.flac
> >  95e54b261530a1bcf6de6fe3b21dc5f6 *./tests/data/flac.vsynth.out.wav
> >  stddev:    0.00 PSNR:999.99 bytes:  1058444/  1058444
> > -4435d87463cd6c5407bd88cca241ca56 *./tests/data/a-wmav1.asf
> > +6f7f3116b801ea641ce14f827de05cce *./tests/data/a-wmav1.asf
> >  106004 ./tests/data/a-wmav1.asf
> >  stddev:12251.38 PSNR: 14.56 bytes:  1056812/  1058444
> >  stddev: 2105.96 PSNR: 29.85 bytes:  1048620/  1058444
> > make: *** [codectest] Error 1
> 
> I have no idea what's special about those configurations. For that matter, 
> why didn't all the other mdct codecs and all the other configurations 
> change? 

> And how could anyone expect md5 matches for floating-point codecs?

wasnt expected, it just happened to work out by luck well enough to be
useable as a regression test

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Good people do not need laws to tell them to act responsibly, while bad
people will find a way around the laws. -- Plato
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