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Remove cppc from the zen5 feature list #131

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Motivations for taking cppc out:

  • There's no upstream support in KVM for this AMD feature, so this won't be trivial to support for KVM-based virtualization. Plus AFAIK this feature isn't used in Linux yet.

  • This does not seem to be something a compiler would use. For instance this is not included in GCC's znver5 list: https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html.

  • There are other existing features that can tell zen5 apart from previous zen generations, for instance avx_vnni and movdiri, so the removal won't impact correct identification.

Motivations for taking `cppc` out:

* There's no upstream support in KVM for this AMD feature, so this won't
  be trivial to support for KVM-based virtualization. Plus AFAIK this
  feature isn't used in Linux yet.

* This does not seem to be something a compiler would use. For instance
  this is not included in GCC's znver5 list: https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html.

* There are other existing features that can tell zen5 apart from
  previous zen generations, for instance `avx_vnni` and `movdiri`, so
  the removal won't impact correct identification.
@alalazo alalazo added the enhancement New feature or request label Jan 29, 2025
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