Tested on amd64 and pentium3 with float and double samples.

The INF csound macro is 8.0e11 (25367 years). I have chosen this value
because it works with

  sr = 192000
  ksmps = 1
  tempo = 1

Therefore, no problems with

  t0 1
  f0 $INF

Likewise, if the score is empty, add "f0 800000000000.0".

I have not modified the INF macro in the C language
(unused now but it can be useful in the calculations also with int32)

This line in twarp.c can cause a segvault with score 32bit and double
samples, if the time is large and/or the tempo is less than 60.

  tp->betbas = FL(999999.9);                /* and cap with large betval */

I have replaced it for 64bit with

  tp->betbas = FL(9223372036854775807.0);   /* and cap with large betval */

Applied in git.

tito

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