[apt4ssx8] Re: Compiling apt360 with g77
- From: Jon Elson <elson@xxxxxxxxxxxxxxxx>
- To: apt4ssx8@xxxxxxxxxxxxx
- Date: Wed, 27 Jun 2012 20:21:37 -0500
Brent Muller wrote:
On 6/27/2012 10:54 AM, Jon Elson wrote:
Brent Muller wrote:
There are two things that come to mind when porting: one, what would
be the affect of running code made for big-endian machines on intel?
Properly written pure Fortran code should be very unlikely to suffer
problems with this.
You could certainly run into issues with assembler routines, or in
places where
several byte variables are commoned to a wider variable. Otherwise,
the byte order
I think this problem, where smaller byte variables are commoned into a
wider variable, was precisely the problem.
Yup, a typical thing to do, especially in the old days, and its sure to
cause problems
when the endian-ness is changed. If possible, the code that needs these
sorts of
conversions should be looked at to see if there is an endian-independent
way to do
this. Assembling bytes into a variable (CPU register) should be correct
for any
endianness of the memory architecture.
Jon
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