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Migrating 32-bit Applications to 64-bit
on Tue 22nd Feb 2011 19:52 UTC, submitted by
Your company is ready to upgrade its custom applications from 32-bit to 64-bit. (Finally.) Here's
to help you make the transition as painless as possible.
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on Wed 23rd Feb 2011 20:27 UTC in reply to "
I find it's less to do with having written perfect software and more to do with the programmers trying to be more clever than they actually are. Trying to do things like custom pointer arithmetic or weird signed operations will break an app in a bad when moving between 32 and 64 bit. The few extra clock cycles you save are in no way worth the portability penalty.
It isn't necessarily as simple as that. Very hot inner loops, particularly in graphics processing software, can necessitate a few dirty tricks to get the maximum performance out of the hardware. However, such occurrences should be few and far between, and should always be clearly marked as such and handled with care. What you describe is what comes out of a programmer doing what exactly Donald Knuth warned against: "We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil".
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