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Parallel Overhead LSD Radix Sort
Robert Clausecker, Florian Schintke
We present Radsort, a variant of LSD radix sort, sorting data with additional space. Radsort is stable, admits a simple implementation and is easy to parallel…
Practical Parallel Block Tree Construction: First Results
Robert Clausecker, Florian Kurpicz, Etienne Palanga
The block tree [Belazzougui et al., J. Comput. Syst. Sci. '21] is a compressed representation of a length- text that supports access, rank, and select queries while requiring on…
Faster Positional-Population Counts for AVX2, AVX-512, and ASIMD
Robert Clausecker, Daniel Lemire, Florian Schintke
The positional population count operation pospopcnt() counts for an array of w-bit words how often each of the w bits was set. Various applications in bioinformatics, database engi…
Transcoding Unicode Characters with AVX-512 Instructions
Robert Clausecker, Daniel Lemire
Intel includes in its recent processors a powerful set of instructions capable of processing 512-bit registers with a single instruction (AVX-512). Some of these instructions have…