Optimizer Problem

[Ray Nachlinger]

On Mon, 3 Jul 2006, Stefanos Folias wrote:

> To whom it may concern,
> 
> I have been using gfortran on Mac running Tiger.  I have been wrestling with a
> horrible discrepancy between the use of optimizers and not.  I have tried
> omitting certain flags to determine what may be causing the problem to no
> avail.  The discrepancy is a function of one of the dimension of the array,
> i.e., there is a threshold length where one type of result occurs below and
> another occurs above.  However, the result shouldn't at all be dependent on
> the length of the array.  With no optimizers, the same result occurs, and
> matches the result as generated by f95 on a server running unix.  Thus, the
> optimizers have an inherent problem.
> 
> Could you forward this email, or provide me with a contact for someone who may
> be able to help me with this problem.

  I have a large program with runs quite nicely with -O3 on OSX 10.4 
  using gfortran4.1.1. Perhaps you are using a previous versions. If
  so you really need to upgrade. The older ones do, in fact, have bugs.