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cpu_features: library from Google Compiler Research Team

[…]Here’s the problem: there’s no way to know a priori which instructions your CPU supports. Identifying the CPU manufacturer isn’t sufficient. For instance, Intel’s Haswell architecture supports the AVX2 instruction set, while Sandy Bridge doesn’t. Some developers resort to desperate measures like reading /proc/cpuinfo to identify the CPU and then consulting hardcoded mappings of CPU IDs to instructions. Enter cpu_features, a small, fast, and simple open source library to report CPU features at runtime. Written in C89 for maximum portability, it allocates no memory and is suitable for implementing fundamental functions and running in sandboxed environments. The library currently supports x86, ARM/AArch64, and MIPS processors, and we’ll be adding to it as the need arises. We also welcome contributions from others interested in making programs “write once, run fast everywhere.”

By Guillaume Chatelet, Google Compiler Research Team

https://opensource.googleblog.com/2018/02/cpu-features-library.html

https://github.com/google/cpu_features

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