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gnu fortran compiler on 64 bit machines
- From: zuheyr <alsalihi at vki dot ac dot be>
- To: fortran at gcc dot gnu dot org
- Date: Tue, 2 Oct 2007 04:05:28 -0700 (PDT)
- Subject: gnu fortran compiler on 64 bit machines
Hello,
I am using GNU fortran on 32/64 bit Fedora Core 6 Linux machines using
Pentium IV and AMD
Athlon processors. I use fortran 77 and fortran 90.
I have seen serious differences between the gnu fortran compiled codes and
Lahey fortran compiler
code. I mean not in performance but also in execution as the results
seriously differ.
This is for 32 bit machines. The application is Navier-Stokes equation
solver, so large programs.
However, most notably there are also big differences between gnu fortran
compiled codes on 32 and 64 bit machines.
The 64 bit code does not at all run on what 32 bit gnu compiled code runs.
In the compilations I used the simplest -O flag but there are differences
even with -g flag.
Can you please help me.
regards and thanks for reading
Zuheyr Alsalihi
Can you p
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