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I’m pretty sure there’s some Apple specific instructions that help with Rosetta 2.

• saagarjha 3y ago
  Not for Rosetta 2.
  • tinus_hn 3y ago
    Here’s more information: https://dougallj.wordpress.com/2022/11/09/why-is-rosetta-2-fast/ https://dougallj.wordpress.com/2022/11/09/why-is-rosetta-2-f...
    • saagarjha 3y ago
      These are all standard ARM instructions. Apple tweaks the semantics of some of them in Rosetta mode to better support what they’re doing but it’s otherwise not involving any new encodings.
      • tinus_hn 3y ago
        As named, the extensions called ‘Apple’s secret extension’ are not standard, they are Apple specific and it’s not just ‘tweak the semantics’, it’s custom and only turned on for Rosetta 2 because otherwise they would cause unexpected results for software expediting normal ARM behavior.