Reducing Missed by Compiler Optimizations

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The optimized software can greatly reduce the miss rates Instructions Reorder procedures in memory so as to reduce conflict misses, without affecting correctness Profiling to look at conflicts(using tools they developed) Entry point of basic block at the beginning of a block Branch straightening Data Merging Arrays: improve spatial locality by single array of compound elements vs. 2 arrays Loop Interchange: change nesting of loops to access data in order stored in memory Loop Fusion: Combine 2 independent loops that have same looping and some variables overlap Blocking: Improve temporal locality by accessing “blocks” of data repeatedly vs. going down whole columns or rows Merging Arrays Example // Before: 2 sequential arrays // int val[SIZE]; int key[SIZE]; //After: 1 array of stuctures // struct merge { int val; int key; }; struct merge merged_array[SIZE]; Reducing conflicts between val & key (they might conflict for a single block in the cache); improve spatial locality when they are accessed in a interleaved fashion

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Провайдер

velog

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velog-rss

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54.39

Уверенность

49%