Trying to track down an alpha problem (may be in scm_ihashq).

[Rob Browning]

I'm trying to track down a problem with gnucash on the Alphas, and one
of the candidates for the crash is guile itself.  I've found what
looks like it might be suspicious behavior in scm_ihashq (or more
specifically SCM_UNPACK).

Of course the problem might also have nothing to do with guile, and
might be in g-wrap, other libs, or gnucash itself, but I thought I'd
see what others think.

Here's my modified for debugging version of scm_ihashq

  unsigned int
  scm_ihashq (SCM obj, unsigned int n)
  {
    unsigned int result;
    unsigned long unpack = SCM_UNPACK(obj);
    result = (SCM_UNPACK (obj) >> 1) % n;
    fprintf(stderr, "scm_ihashq (%lu >> 1) %% %u -> %u\n", unpack, n, result);
    fflush(stderr);
    return result;
  }

and at the point of failure, this prints:

  scm_ihashq (18446744073709551614 >> 1) % 31 -> 4294967295

Any help appreciated.

-- 
Rob Browning <address@hidden> PGP=E80E0D04F521A094 532B97F5D64E3930