[Octave-bug-tracker] [bug #45687] fread does not support ARCH 'ieee-le' for double on 64bits PC

[Rik]

Follow-up Comment #4, bug #45687 (project octave):

This works for me as well on GNU/Linux 64-bit and Windows XP 32-bit.  Someone
else with access to a Windows 64-bit installation will have to try and verify
this.

The code in question is in liboctave/util/data-conv.cc and is shown below.


void
do_double_format_conversion (void *data, octave_idx_type len,
                             oct_mach_info::float_format from_fmt,
                             oct_mach_info::float_format to_fmt)
{
  switch (to_fmt)
    {
    case oct_mach_info::flt_fmt_ieee_little_endian:
      switch (from_fmt)
        {
        case oct_mach_info::flt_fmt_ieee_little_endian:
          break;

        case oct_mach_info::flt_fmt_ieee_big_endian:
          IEEE_big_double_to_IEEE_little_double (data, len);
          break;

        default:
          gripe_unrecognized_float_fmt ();
          break;
        }
      break;

    case oct_mach_info::flt_fmt_ieee_big_endian:
      switch (from_fmt)
        {
        case oct_mach_info::flt_fmt_ieee_little_endian:
          IEEE_little_double_to_IEEE_big_double (data, len);
          break;

        case oct_mach_info::flt_fmt_ieee_big_endian:
          break;

        default:
          gripe_unrecognized_float_fmt ();
          break;
        }
      break;

    default:
      (*current_liboctave_error_handler)
        ("impossible state reached in file '%s' at line %d",
         __FILE__, __LINE__);
      break;
    }
}


The only way it can get to the default branch of the case statement is if the
conversion format is not ieee-le or ieee-be.  The fact that it gets there
suggests that something is wrong with the initial determination of the
machine's floating point format.  That determination occurs in
liboctave/system/mach-info.cc.

Could the original reporter try the following at an Octave prompt?


native_float_format ()


On my Linux Intel machine this returns "ieee-le" as it should.  I suspect that
this will return "unknown" for you.


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