C++ library for detecting CPU capabilities
C++ Python



cpuid is a C++ library for CPU dispatching. Currently the project can detect the following CPU capabilities:

  • Instruction sets detected on x86: FPU, MMX, SSE, SSE2, SSE3, SSSE3, SSE 4.1, SSE 4.2, PCLMULQDQ, AVX, and AVX2
  • Instruction sets detected on ARM: NEON


cpuid license is based on the BSD License. Please refer to the LICENSE.rst file for more details.


We have tested cpuid on various versions of Windows, Linux and Mac. We run automated tests on x86 and ARM architectures with different compilers like g++, clang and Microsoft Visual Studio.

You can see the status by selecting the cpuid project on the Steinwurf buildbot page.


We use the waf build system to build the cpuid static library. We have some additional waf tools which can be found at waf.

To configure and build cpuid, run the following commands:

python waf configure
python waf build

The waf configure command will download several auxiliary libraries into a folder called bundle_dependencies within the cpuid folder. You can also use the --bundle-path option to specify the download location for the project dependencies:

python waf configure --bundle-path=/my/path/to/bundle_dependencies

When building the static lib, waf will also build the print_cpuinfo_example executable which is useful to print the available CPU instruction sets. The compiled binary is located in the build/[platform]/examples/print_cpuinfo folder (where [platform] denotes your current platform, e.g. linux, win32 or darwin).


We have created cpuid to fit our specific needs, however we hope that others may also find it useful. When designing cpuid we found inspiration in these other nice projects: