How do I detect CPU features at runtime?

Detecting CPU features at runtime in C++ can be accomplished using the CPUID instruction. This instruction provides information about the CPU's capabilities, allowing you to determine the presence of certain features like SSE, AVX, or specific processor models. The ability to check these features can help optimize performance and ensure compatibility with various hardware.

Example of Detecting CPU Features

#include #include void print_cpuid_info() { unsigned int eax, ebx, ecx, edx; __get_cpuid(0, eax, ebx, ecx, edx); std::cout << "Processor Information:" << std::endl; std::cout << "Vendor ID: " << ((char*)&ebx)[0] << ((char*)&ebx)[1] << ((char*)&ebx)[2] << std::endl; __get_cpuid(1, eax, ebx, ecx, edx); std::cout << "SSE: " << ((edx >> 25) & 1) << std::endl; std::cout << "AVX: " << ((ecx >> 28) & 1) << std::endl; } int main() { print_cpuid_info(); return 0; }

CPU features runtime detection C++ CPUID SSE AVX CPU optimization

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