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A comment on Duff's device: do + switch fall-through = loop unrolling. Parent comment

Re:Duff's device: do + switch fall-through = loop unrolling by TimothyFitz on Thursday August 13, 2009 @03:29PM (#761507)
Or perhaps in this case it's more subtle: code becomes optimized for the wrong thing over time. For example the difference in optimization strategies between netburst pentium 4s and core 2 duos is staggering.
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Re:Duff's device: do + switch fall-through = loop unrolling by joe_the_user on Thursday August 13, 2009 @03:47PM (#761554)
Hmm,

Great point: not only does optimization cost in understanding and system fragility but it can become stale over time and invisibly so.

If you're working on the application level, testing and segregating optimizations like this seems important. Systems level people would operate differently though ...

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