[ 源代码： cpu-features ]
软件包：libcpu-features-dev（0.9.0-1 以及其他的）
cross platform C99 library to get cpu features
Cross-platform C library to retrieve CPU features(such as available instructions) at runtime.
Design rationale:
* Simple to use. * Extensible. Easy to add missing features or architectures. * Compatible with old compilers and available on many architectures so it can be used widely. It's implemented it in C99. * Sandbox-compatible. The library uses a variety of strategies to cope with sandboxed environments or when cpuid is unavailable. * Thread safe, no memory allocation, and raises no exceptions. cpu_features is suitable for implementing fundamental libc functions like malloc, memcpy, and memcmp. * Unit tested.