[vorbis-dev] libvorbis on Classic MacOS
segher at koffie.nl
Thu Feb 6 18:27:53 PST 2003
Timothy Wayper wrote:
> The only warnings look harmless. MrC doesn't recognize the double
> paranethesis convention around intentional "side-effect" assignments, so
> there's a few warnings about those. Plus a few unused parameters/vars,
> including those caused by it using the slow "no FPU control" mode.
> Nothing horrible. There are no changes to the code required, except for
> the inclusion of fp.h in vorbisfile.c for rint(). Alternatively, the use
> of floor((x) + 0.5) for rint gives the same results.
That makes me think... did you set all -DBLABLA's to sane
> Hadn't even thought about Altivec, but I'll look into that immediately.
There were some problems with wrongly aligned stack frames
on MrC with Altivec, I believe. I've never done any much
Altivec in C on MacOS myself, though, so treat this as
> I haven't enabled it, but I don't think MrC automatically SIMD's
> things... and I presume the reference implementation doesn't have a G4
> accelerated backend ;-)
Correct on both accounts, I think. But maybe some (system)
library uses Altivec internally and you get bitten by the
> I was concerned that maybe I was running out of stack space (since it's
> manually adjusted on classic MacOS), but I turned that up to a 2Mb's,
> and it made no difference.
Vorbis doesn't use nearly that much, fortunately ;)
> Thanks for your comments, that's actually very helpful! Now I know it
> can work, I'll try a little harder :-)
Glad to be of help. MacOS "Classic" is kind of dear to
> Since the problem happens relatively early on, I'll run the same data
> through a machine running Vorbis 1.0 on another (working) platform, and
> compare it step by step with the problem case...
Insert lots and lots of fprintf()'s.
p.s. If you suspect miscompilation of a certain routine, feel
free to send me asm dumps (+ original code).
<p>--- >8 ----
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