Getting Swole: Generating Access-Aware Code with Predicate Pullups
Andrew Crotty, Alex Galakatos, Tim Kraska · 2020
Code generation for in-memory query processing is now commonplace. While existing approaches use a wide range of techniques (e.g., inline expansion, pipelining, SIMD vectorization, prefetching) to reduce processing effort, we argue that generating code with better data access patterns is often more important. Therefore, we propose SWOLE, the first access-aware code generation strategy. Contradictory to the conventional wisdom, SWOLE heavily leverages predicate pullups to produce code with better access patterns, which outweighs the overhead of performing wasted work. Our experiments show that SWOLE can outperform the state-of-the-art approach by over 2.6×.