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 Post subject: Inaccurate CPUID bits in : https://wiki.osdev.org/SSE
PostPosted: Sun Sep 18, 2022 12:12 pm 
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Faulty CPUID Bits written in osdev : https://wiki.osdev.org/SSE

Straight forward from the CPUID page in wikipedia, https://en.wikipedia.org/wiki/CPUID#EAX ... d_Features

- EDX[26] is the IBRS_IBPB / spec_ctrl features, not AVX2
- AVX2 is detected through CPUID [EAX=7, ECX=0] EBX Bit 5

- AVX512 Separated features are detected also through CPUIDEX 7, it is easier to detect AVX512 just by checking the AVX512F Bit (AVX-512 Foundation) in EBX[16] (SubFunction 0).

Devc1,


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 Post subject: Re: Inaccurate CPUID bits in : https://wiki.osdev.org/SSE
PostPosted: Sun Sep 18, 2022 12:16 pm 
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Feel free to amend the page.

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My OS is Norost B (website, Github, sourcehut)


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 Post subject: Re: Inaccurate CPUID bits in : https://wiki.osdev.org/SSE
PostPosted: Sun Sep 18, 2022 2:22 pm 
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That's the problem ! everyone tells me to create/edit pages but I have no permissions.


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 Post subject: Re: Inaccurate CPUID bits in : https://wiki.osdev.org/SSE
PostPosted: Sun Sep 18, 2022 3:05 pm 
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Have you read this yet?


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 Post subject: Re: Inaccurate CPUID bits in : https://wiki.osdev.org/SSE
PostPosted: Sun Sep 18, 2022 3:15 pm 
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So I joined but it still gives me the message :

You do not have permission to edit this page, for the following reason:

The action you have requested is limited to users in the group: Users.

You can view and copy the source of this page:


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 Post subject: Re: Inaccurate CPUID bits in : https://wiki.osdev.org/SSE
PostPosted: Sun Sep 18, 2022 3:17 pm 
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Done, now I have editing rights ! Thanks :)


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