Many linux distributions are now available in 64 bit versions for "amd64" or "ext64" based x86 cpu's. There are also 64-bit Alpha, 64-bit Sparc, IA64, PPC64, and possibly other 64-bit architecture based distributions.
It is possible to run in "32-bit compatibility" mode so that 32 bit binaries can execute on a 64-bit processor (assuming we are talking about x86_64 here) so I assume your fortran procedure would be fine. I'd also assume you could recompile it with gcc to get a native 64-bit version it you wanted?
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