Speex dev - Jan 2008 - Problem with Blackfin assembly optimizations -- bug in fixed_bfin.h?

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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Hi,

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

	Jean-Marc

Frank Lorenz a ?crit :
> 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 
> _________________________________________________________________________
>  In 5 Schritten zur eigenen Homepage. Jetzt Domain sichern und
> gestalten! Nur 3,99 EUR/Monat!
> http://www.maildomain.web.de/?mc=021114
> 
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