[vorbis-dev] gcc 2.95.2/irix/Laguerre_With_Deflation/inifinte loop
kruus.erik at uqam.ca
Mon Jul 2 05:15:17 PDT 2001
> On Sat, Jun 23, 2001 at 07:24:04PM -0400, ber wrote:
> > I built ogg vorbis from the rc1 cvs source on Irix 6.5.12
> > with gcc 2.95.2. Using oggenc I encoded about 8,000 aiff files
> > but found about a dozen where oggenc would go into an infinite
> > loop. I tracked the problem with Laguerre_With_Deflation() as far back
> > as
> > logmask being Inf in floor0_forward.
> OK, that's important to know. All of it?
> I'm now building gcc 3.0 with the
> > expectation this is a compiler issue. If not, I'll back trace further.
> > Has this been observed by anyone else? I didn't see it in a search of
> > the
> > archive.
>From the archive between my shoulders... and a different vorbis era...
At one point I stumbled across some NaN's in the vq libs that garbled, rarely,
an occasional file. I believe that one was in the vq "metrics" somewhere and
fixed by doing a paranoia-check for sqrt(even-so-slightly--ve). Don't recall
details, but it was "easily" fixed (once found) and didn't cause an infinite loop,
I did change my encoder/vq to add trapping on -all- FPU exceptions after I
caught that one, though, just in case. Didn't find more, but my test input
was small (only around 10 Gigs of CD)and it wasn't mainstream libvorbis
> No, not seen. And I'm not tripping it here using the file you
> provided (although that could just be an effect of Linux/PowerPC not
> tripping an exception where IRIX/MIPS would).
> I'll try this with the processor configured to spew more tomorrow.
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