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Systems & Performance 2 Software Engineering 2

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Branchless Quicksort faster than std:sort and pdqsort with C and C++ API

2026216 points81 comments Software Engineering details

Performance results naturally depend on the underlying hardware. The following benchmarks show the execution times for sorting 50 million doubles using different sorting implementations. The measurements were taken on an Apple M1 system using Clang and on an AMD Ryzen 3 Linux system using GCC , both compiled with the…

Your code is fast if you're lucky

2026136 points85 comments Software Engineering details

Recently, while working on an optimized Quicksort implementation, I came across a rather interesting quirk. Modern compilers (especially Clang) optimize loops using fast, branch-free instructions - provided you use the right programming style.