Linked by David Adams on Tue 22nd Feb 2011 19:52 UTC, submitted by estherschindler
General Development Your company is ready to upgrade its custom applications from 32-bit to 64-bit. (Finally.) Here's 10 tips to help you make the transition as painless as possible.
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RE: ?
by Delgarde on Tue 22nd Feb 2011 20:58 UTC in reply to "?"
Delgarde
Member since:
2008-08-19

If you're written perfect software, then it's not hard at all. But nobody writes perfect software, and so code might be written with invalid assumptions - e.g that the size of a pointer is the same as the size of a standard integer, or more generically, that a pointer can be stored in an int type. Which is true when the pointer is 32-bit, but when the code is compiled 64-bit, that's not the case, and things either fail to compile, or break with memory issues at runtime.

Keep in mind it's not necessarily deliberate - it's just that because this code worked fine for a decade or more, it's clearly ok. It might be wrong, but because a pointer is the same size as a 32-bit integer, it works and goes unnoticed. Until, that is, the pointer size becomes 64-bit.

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