[vorbis-dev] gcc 2.95.2/irix/Laguerre_With_Deflation/inifinte loop

[Erik Kruus]

Monty wrote:
> 
> 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
code.

> 
> 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.
> 
> Monty
> 
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