[Speex-dev] Problem with Blackfin assembly optimizations -- bug in fixed_bfin.h?

Jean-Marc Valin jean-marc.valin at usherbrooke.ca
Sun Jan 20 03:32:27 PST 2008


Just following up on this. Did were you able to figure out what causes
the problem? Also, does it happen with 1.2beta2?


Frank Lorenz a écrit :
> Hello everybody,
> I'm currently trying to run speex on the Blackfin (BF-537) STAMP
> evaluation board unter uCLinux. Using 1.2 beta 3, I encountered
> problems when activating the Blackfin assembler optimizations.
> Without optimizations for blackfin, i.e. calling ./configure
> --enable-fixed-point --host=bfin-uclinux everything seems to work
> fine. But when I add  the --enable-blackfin-asm flag to the above
> call, a speech signal which has been passed through the codec is
> cleary disturbed (for me, it sounds like the long term prediction
> (voice pitch detection) fails -- the signal sounds like the speaker
> has a very ugly sore throat). I tried to deactivate each part of the
> optimizaitions inside the libspeex directory, one after another. Most
> of the "turn-offs" doesn't have any effect. When turning off the
> optimizations inside "fixed_bfin.h", there is a big improvement --
> the decoded speech sounds good again, only on some positions in my
> speech signal is a huge "click" which sounds like an overdrive caused
> by an  instable filter. When trying to switch off the optimizations
> from "filters_bfin.h", my little program compiles but crashes on
> runtime, sometimes (not always reproducable) causing a kernel panic
> of uclinux. Error info is "Attempted misaligned instruction cache
> fetch".
> Does anybody know what happens here?
> best regards, Frank 
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