Quick Search algorithm and strstr
The document discusses and benchmarks various string search algorithms, including Quick Search, strstr, and a custom implementation using SSE4.2 instructions. It finds that for short substrings, strstr in GCC utilizing SSE4.2 performs best, while for longer substrings, a modified Quick Search algorithm is faster. The author's own implementation using pcmpestri outperforms all other algorithms, bei
Fast Intersection of Sorted Lists Using SSE Instructions
Intersection of sorted lists is a cornerstone operation in many applications including search engines and databases because indexes are often implemented using different types of sorted structures. At GridDynamics, we recently worked on a custom database for realtime web analytics where fast intersection of very large lists of IDs was a must for good performance. From a functional point of view, w
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