Efficient Data Structures
Software performance is often equated with the efficiency of the algorithms and data structures used by the implementation. It is sometimes suggested that algorithm and data structure efficiency is the most important factor in software performance. Whether it is or it isn't, there is no question that the use of efficient algorithms is a necessary condition for software efficiency. No amount of microtuning will help if you choose inefficient algorithms. You can stuff all variables into registers, inline every function, and unroll every loop. Still, your bubble-sort program is not going to be anywhere near as fast as a sloppy implementation of quick-sort.
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