[PD] freeverb~ problem

Kjetil Matheussen k.s.matheussen at gmail.com
Mon Feb 8 10:44:14 CET 2016


Regarding denormals, if that's the problem, shouldn't it be good enough
to compile with -fpmath=sse -msse2 and run the following code one time in
the dsp thread?

#ifdef __SSE__
    #ifdef __SSE2__
        #define AVOIDDENORMALS _mm_setcsr(_mm_getcsr() | 0x8040)
    #else
        #define AVOIDDENORMALS _mm_setcsr(_mm_getcsr() | 0x8000)
    #endif
#else
#   error "must compile with -fmpath=sse"
#endif




On Mon, Feb 8, 2016 at 10:28 AM, Kjetil Matheussen <k.s.matheussen at gmail.com
> wrote:

> You could use the faust version of freeverb and compile it for pd. It's
> probably less likely to have bugs.
> For instance by pasting
> http://sourceforge.net/p/faudiostream/code/ci/master/tree/examples/freeverb.dsp?format=raw
> into http://faust.grame.fr/onlinecompiler/
>
>
> On Sun, Feb 7, 2016 at 4:08 AM, Ivica Bukvic <ico at vt.edu> wrote:
>
>> Thank you, Katja. Is there a newer version than this out there?
>>
>> Best,
>>
>> --
>> Ivica Ico Bukvic, D.M.A.
>> Associate Professor
>> Computer Music
>> ICAT Senior Fellow
>> Director -- DISIS, L2Ork
>> Virginia Tech
>> School of Performing Arts – 0141
>> Blacksburg, VA 24061
>> (540) 231-6139
>> ico at vt.edu
>> www.performingarts.vt.edu
>> disis.icat.vt.edu
>> l2ork.icat.vt.edu
>> ico.bukvic.net
>> On Feb 6, 2016 10:25 AM, "katja" <katjavetter at gmail.com> wrote:
>>
>>> If the freeverb~ version you use looks like the one in
>>>
>>> http://sourceforge.net/p/pure-data/svn/HEAD/tree/trunk/externals/freeverb~/freeverb~.c
>>> ,
>>> there's a function 'fix_denorm_nan_float() defined starting at line
>>> 154. The function is called later (in line 225 and others) but the
>>> return value is never stored. Therefore freeverb~ doesn't flush
>>> denormals.
>>>
>>> On Sat, Feb 6, 2016 at 3:34 PM, Ivica Bukvic <ico at vt.edu> wrote:
>>> > Thank you all. Looks like I've got some troubleshooting to do and will
>>> > report what I find.
>>> >
>>> > Best,
>>> >
>>> > --
>>> > Ivica Ico Bukvic, D.M.A.
>>> > Associate Professor
>>> > Computer Music
>>> > ICAT Senior Fellow
>>> > Director -- DISIS, L2Ork
>>> > Virginia Tech
>>> > School of Performing Arts – 0141
>>> > Blacksburg, VA 24061
>>> > (540) 231-6139
>>> > ico at vt.edu
>>> > www.performingarts.vt.edu
>>> > disis.icat.vt.edu
>>> > l2ork.icat.vt.edu
>>> > ico.bukvic.net
>>> >
>>> > On Feb 6, 2016 9:20 AM, "IOhannes m zmölnig" <zmoelnig at iem.at> wrote:
>>> >>
>>> >> On 02/06/2016 10:29 AM, katja wrote:
>>> >> > Possibly an inf or nan recirculating in the delay lines? It seems
>>> that
>>> >> > freeverb~ calls function fix_denorm_nan_float(float v) but doesn't
>>> use
>>> >> > the return value.
>>> >>
>>> >> you *might* be able to confirm this by sending the output for
>>> >> [freeverb~] to [print~] (the silent samples would be NaN or Inf rather
>>> >> than 0 (or some other constant value))
>>> >>
>>> >> gamds
>>> >> IOhannes
>>> >>
>>> >>
>>> >>
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>>
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>
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