How to use CPUID instruction to get x86 CPU features correctly? -


i want write small program features of x86cpus. after referring cpuid document, find there 2 sections:

(1) eax=1: 

...... of january 2011, standard intel feature flags follows:  ......

(2) eax=80000001h: 

...... amd feature flags follows: ......

so means if cpu vendor genuineintel, should use eax=1 while if authenticamd, should use eax=80000001h execute cpuid instruction. understanding correct?

after referring amd cpuid , intel cpuid documents, can learn flags different eax 1 cpuid instruction, need differentiate them.


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