[Octave-bug-tracker] [bug #50600] floating point format is not IEEE! (using PGI compiler)

[Mike Miller]

Follow-up Comment #7, bug #50600 (project octave):

I think the previous issue that Philip is recalling was with an older release
of Octave and an older release of GCC. There is no guarantee that the issue
you are seeing with the PGI compiler is the same or related.

I think Philip is referring to the liboctave library, make sure that you don't
have multiple copies of Octave in your environment or leftover build products
of a different configuration.

If you want to debug this, you will probably want to look at the
octave::get_float_format routine in liboctave/system/mach-info.cc. This
function looks at the values of certain floating point constants returned by
the Fortran function DLAMCH (which is part of LAPACK, or OpenBLAS in your
case) and compares them to what they should be if the system supports IEEE
floating point, either big-endian or little-endian. You should be able to look
at the results in a debugger (or printf debugging) to see what values are not
matching up.

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