csound5.11 f-statements

[marleynoe]

Hello,

Please excuse me writing this long email.
I have a question about a new feature in csound5.11, which I thought  
is rather appropriate for the devel-list.

It says in the release notes:

     PMAX, the number of arguments to a score event has been reduced
     by 2, and an overflow system introduced so GENs can have
     arbitrary numbers of arguments

After some testing today (with GEN7 and GEN-7) I found that there  
still seems to be a limit, or perhaps a bug:

The limit seems to be different depending if one uses a negative GEN-
number (bypasses rescaling) or not. Below are some examples (posts to  
the Csound5GUI-console).
I am not posting the scores (because of the long f-statements), the  
orchestra is at the bottom of the mail.
I am using "Csound version 5.11 (double samples) Sep 24 2009" on a  
MBPro17", MacOS10.6.1.


For negative GEN-numbers the max number of p-fields seems to be 2010:

1. 2010 p-fields (4+1003 value-pairs) with GEN-7
--------------------------------------------
ftable 500: 4097 points, scalemax 1.568
new alloc for instr 1:
B  0.000 ..  1.000 T  1.000 TT  1.000 M:    -2.09
Score finished in csoundPerformKsmps().
inactive allocs returned to freespace
end of score.   overall amps:    -2.09
           overall samples out of range:        0
0 errors in performance

---> works fine.


2. 2012 p-fields (4+1004 value-pairs) with GEN-7
------------------------------------------
ftable 500: gen call has negative segment size:
f500     0.00  4097.00    -7.00   -1.56 ...
new alloc for instr 1:
INIT ERROR in instr 1: Invalid ftable no. 500.000000
a2 poscil.kk iamp idurosc iaenv 0
          B  0.000 - note deleted.  i1 had 1 init errors
Score finished in csoundPerformKsmps().
inactive allocs returned to freespace
end of score.   overall amps:      0
           overall samples out of range:        0
1 errors in performance

---> doesn't work because of 'negative segment size' (-> the f-
statement is exactly the same as above just more p-fields)

3. 4004 p-fields (4+2000 value pairs) with GEN7
------------------------------------------
ftable 500: 4097 points, scalemax 1.000
new alloc for instr 1:
B  0.000 ..  1.000 T  1.000 TT  1.000 M:    -6.00
Score finished in csoundPerformKsmps().
inactive allocs returned to freespace
end of score.   overall amps:    -6.00
           overall samples out of range:        0
0 errors in performance

---> this works. Please note, however, that Csound5GUI was crashing  
every now and then with these large f-statements.

Is this the expected behaviour or is there perhaps something I am not  
seeing or I missed (e.g. do I need to set some environment-variables  
or similar)?
Any help/suggestions would be greatly appreciated!

Many thanks,
Best,
Marlon

PS: If it helps I could provide the scores as a textfile.


Here is the orchestra (simple, for testing-purposes ...the tables  
above are used for iaenv):

sr = 44100
kr = 44100
ksmps = 1
nchnls = 1
0dbfs   = 8388607 ; 24 bits

instr 1

idur = p3
idurosc = 1/idur
iamp = (p4 > 0.0 ? (p4*0.001*0dbfs) : (ampdbfs (p4)))
ifq = p5
iaenv = p6
iaudiofun = 1

    a2    poscil  iamp, idurosc, iaenv
    a1    poscil  a2, ifq, iaudiofun
          out     a1

endin


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