This repository contains SIMD versions of quicksort, using AVX512F and AVX2 instruction sets. The subdirectory results contains performance results.

The code is still unfinished, it may be subject of changes.

Although programs are written in C++, most procedures are nearly plain C, except use of namespaces and references in place of pointers.

At least GCC 5.3.0 is needed. Type make to build AVX512F and AVX2 versions of two programs:

• test/test_avx2 --- tests if SIMD-ized sorting procedures work correctly for various inputs.
• speed/speed_avx2 --- compares speed of different procedures, scalar and SIMD for various inputs.
• speed_stats/speed_avx2_stats --- similar to speed, but some procedures collect and print runtime statistics. Note that this gives overhead, so for real performance tests the basic variant of the programs should be used.

Intel Software Development Emulator can be used to run AVX512 variants.

• Fast Sorting Algorithms using AVX-512 on Intel Knights Landing https://arxiv.org/pdf/1704.08579.pdf