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CPUID
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<p>In the <a href="/facts/X86/Kypq5fgu">x86</a> architecture, the CPUID instruction (identified by a CPUID <a href="/facts/Opcode/UaLMp56C">opcode</a>) is a <a href="/facts/Processor_supplementary_instruction/DmXyM0dk">processor supplementary instruction</a> (its name derived from "<a href="/facts/Central_processing_unit/Jxp1bqMV">CPU</a> Identification") allowing software to discover details of the processor. It was introduced by <a href="/facts/Intel/SMF0gJJX">Intel</a> in 1993 with the launch of the <a href="/facts/Pentium/czINY469">Pentium</a> and <a href="/facts/SL-enhanced_486/2zfEAXAw">SL-enhanced 486</a> processors. </p><p>A program can use the CPUID to determine processor type and whether features such as <a href="/facts/MMX_(instruction_set)/8o3JJhns">MMX</a>/<a href="/facts/Streaming_SIMD_Extensions/mMa6EFyB">SSE</a> are implemented. </p>