nanomsg library

A query and indexing engine for Redis, providing secondary indexing, full-text search, vector similarity search and aggregations.

Hexagonal hierarchical geospatial indexing system

A standalone and lightweight C library

CPU INFOrmation library (x86/x86-64/ARM/ARM64, Linux/Windows/Android/macOS/iOS)

An embeddable fulltext search engine. Groonga is the successor project to Senna.

Collection of miscellaneous portable C snippets.

the fastest in-memory index in the East 东半球最快并发索引

🚀 Fast C/C++ bit population count library

C library to pack and unpack short arrays of integers as fast as possible

bit & sketches data structures

immintrin_dbg.h is an include file, a wrapper around immintrin.h. It implements most of AVX, AVX2, AVX-512 vector intrinsics to enable source level debug of vector code.

SIMD recipes, for various platforms (collection of code snippets)

Interleaving bits from two sources using SIMD instructions.

Anytime Ranking for Impact-Ordered Indexes

Code repo for the SIGIR '17 paper "Efficient Cost-Aware Cascade Ranking for Multi-Stage Retrieval"

Reproduction code for weird bimodal performance on Intel Skylake CPU

The Wand and Block-Max Wand code used for experiments in our WSDM 2017 paper.

Implementation of succincter by Mihai Patrascu

C library to aid with SSE programming, the appropriate intrinsic is applied at compile time using internally define types to keep track of underlying vector component types, GNU C Compilers (gcc, i…

List Thresholds and Split-lists for WAND/BMW used in a SIGIR 2018 short paper. (built on code used in a WSDM 2017 paper)