Implementations of SIMD instruction sets for systems which don't natively support them.

Fast and exact implementation of the C++ from_chars functions for number types: 4x to 10x faster than strtod, part of GCC 12, MySQL, DuckDB, Chromium, Redis and WebKit/Safari

A simple and fast linear algebra library for games and graphics

Unicode routines (UTF8, UTF16, UTF32) and Base64: billions of characters per second using SSE2, AVX2, NEON, AVX-512, RISC-V Vector Extension, LoongArch64, POWER. Part of Node.js, WebKit/Safari, Ladybird, Chromium, Cloudflare Workers, Ghostty and Bun.

WHATWG-compliant and fast URL parser written in modern C++, part of Internet Archive, Node.js, Clickhouse, Redpanda, Kong, Telegram, Adguard, Datadog and Cloudflare Workers.

Expressive Vector Engine - SIMD in C++ Goes Brrrr

SIMD Library for Evaluating Elementary Functions, vectorized libm and DFT

Fastest Integer Compression

fccf: A command-line tool that quickly searches through C/C++ source code in a directory based on a search string and prints relevant code snippets that match the query.

Agenium Scale vectorization library for CPUs and GPUs

TurboRLE-Fastest Run Length Encoding

Boost SIMD

Single-header c99 accelerated float/double parsing. Port of the fast_float library.

A general purpose machine code manipulation library for x86-32 (IA-32) and x86-64 (AMD64) architectures (Assembler, Disassembler, Library).

SIMD macro assembler unified for ARM, MIPS, PPC and x86

Optimized Recursive Bilateral Filter

Fastest Histogram Construction

Low level generic SIMD wrapper for x86, ARM, WASM with dynamic dispatch

A header only ready to include mirror of the HIIR library by Laurent De Soras, an oversampling and Hilbert transform library in C++, with additional support for double precision on ARM AArch64 using Neon.

A simple demo shows how to use the SIMD,Single Instruction Multiple Data, to optimize and accelerate the FFT algorithm.