# simde
**Wikidata**: [Q122875001](https://www.wikidata.org/wiki/Q122875001)  
**Source**: https://4ort.xyz/entity/simde

## Summary
Simde is a software library that provides portable implementations of SIMD (Single Instruction, Multiple Data) instructions, enabling developers to write SIMD code that works across different platforms without requiring specific hardware support. It acts as a compatibility layer, allowing code written for one SIMD instruction set to run on systems that don't natively support it.

## Key Facts
- Simde is licensed under the MIT License
- The latest stable version is 0.8.2, released on May 2, 2024
- Simde's source code is hosted on GitHub at https://github.com/simd-everywhere/simde
- The library provides implementations for multiple SIMD instruction sets including SSE, AVX, NEON, and others
- Simde has been actively developed since at least 2020, with version 0.5.0 released on June 22, 2020
- The project maintains a blog at https://simd-everywhere.github.io/blog/
- Simde is classified as software and is an instance of software

## FAQs
### Q: What is simde used for?
A: Simde is used to write portable SIMD code that can run across different platforms and architectures without requiring specific hardware support for particular instruction sets.

### Q: Is simde free to use?
A: Yes, simde is free to use under the MIT License, which allows for both commercial and non-commercial use with minimal restrictions.

### Q: What platforms does simde support?
A: Simde supports multiple platforms and architectures by providing implementations for various SIMD instruction sets including SSE, AVX, NEON, and others, making it portable across different systems.

## Why It Matters
Simde plays a crucial role in modern software development by solving a significant portability problem in SIMD programming. Without simde, developers would need to write separate code paths for different architectures or limit their software to only platforms with specific SIMD instruction set support. This library enables performance-critical applications to maintain cross-platform compatibility while still leveraging SIMD optimizations where available. For developers working on libraries, frameworks, or applications that need to run efficiently across diverse hardware ecosystems, simde eliminates the need for complex conditional compilation and platform-specific code branches. This not only reduces development and maintenance overhead but also ensures more consistent performance characteristics across different deployment environments.

## Notable For
- Provides portable SIMD implementations that work across multiple architectures without hardware-specific dependencies
- Actively maintained with frequent releases, showing the latest version 0.8.2 released in May 2024
- MIT License allows unrestricted commercial and non-commercial use
- Comprehensive coverage of major SIMD instruction sets including SSE, AVX, and NEON
- Open source development model with active GitHub repository and community engagement

## Body
### Development History
Simde has been under active development since at least 2020, with the first recorded stable version (0.5.0) released on June 22, 2020. The project has maintained a consistent release schedule, with major versions released approximately every few months. Version 0.6.0 followed on August 24, 2020, then 0.7.0 on December 27, 2020, demonstrating the project's momentum in its early stages.

### Version Timeline
The library has seen steady incremental improvements through versions 0.7.2 (January 24, 2021), 0.7.4 (May 5, 2023), and 0.7.6 (May 16, 2023). The jump to version 0.8.0 occurred on March 14, 2024, followed by the current stable release 0.8.2 on May 2, 2024, indicating active ongoing development and refinement.

### Technical Implementation
Simde provides header-only implementations of various SIMD instruction sets, allowing developers to include the library in their projects without complex build system modifications. The library automatically detects available instruction sets and provides fallbacks when native support is unavailable, ensuring consistent behavior across different platforms.

### Community and Documentation
The project maintains a blog at https://simd-everywhere.github.io/blog/ for announcements, updates, and technical discussions. The GitHub repository serves as the primary hub for development, issue tracking, and community contributions, following standard open source practices for collaborative software development.

## References

1. [Source](https://api.github.com/repos/simd-everywhere/simde)
2. [Release 0.5.0. 2020](https://github.com/simd-everywhere/simde/releases/tag/v0.5.0)
3. [Release 0.6.0. 2020](https://github.com/simd-everywhere/simde/releases/tag/v0.6.0)
4. [Release 0.7.0. 2020](https://github.com/simd-everywhere/simde/releases/tag/v0.7.0)
5. [Release 0.7.2. 2021](https://github.com/simd-everywhere/simde/releases/tag/v0.7.2)
6. [Release 0.7.4. 2023](https://github.com/simd-everywhere/simde/releases/tag/v0.7.4)
7. [Release 0.7.6. 2023](https://github.com/simd-everywhere/simde/releases/tag/v0.7.6)
8. [Release 0.8.0. 2024](https://github.com/simd-everywhere/simde/releases/tag/v0.8.0)
9. [Release 0.8.2. 2024](https://github.com/simd-everywhere/simde/releases/tag/v0.8.2)