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I want to write a small program to get the features of x86CPUs. After referring CPUID document, I find there are 2 sections:

(1) EAX=1: 

......
As of January 2011, the standard Intel feature flags are as follows: 
......

(2) EAX=80000001h: 

......
AMD feature flags are as follows:
......

So it means if CPU vendor is GenuineIntel, I should use EAX=1 while if it is AuthenticAMD, I should use EAX=80000001h to execute CPUID instruction. Is my understanding correct?

jww
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Nan Xiao
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  • What exactly do you want to detect? If it's something vendor-neutral like SSSE3, then you should execute CPUID with the inputs specified by the feature you're trying to detect... – Peter Cordes Sep 12 '17 at 05:10

1 Answers1

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After referring AMD CPUID and Intel CPUID documents, I can learn their flags are different for EAX 1 CPUID instruction, so need to differentiate them.

Nan Xiao
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