Sometimes it is necessary to find out the functionality available in a processor. In your program, you can, for example, look for the presence or absence of a certain version of SSE. In the next chapter, we will use programs with SSE instructions, so we need to find out first which version of SSE is supported by our processor. There is an instruction for checking the CPU characteristics: cpuid.
Using cpuid
You first put a specific parameter in eax, then execute the instruction cpuid, and finally check the returned value in ecx and edx. Indeed, cpuid uses 32-bit registers.
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