3 ms·

I mean it’s totally crazy, emulation of Arm on x86 has always felt extremely slow, to me anyway.

• Reason077 6y ago
  Apple put some special sauce in the M1 to help make rosetta fast. Support for the x86 TSO memory model, for one thing.
  • marcan_42 6y ago
    Also ARM now has a bunch of instructions that are blatantly there for efficient x86 emulation, though ARM won't tell you that in the docs.
    • jtl999 6y ago
      IBM POWER9 supports some memory ordering instructions that (as I understand) would in theory be useful for x86 emulation, but a) I'm unsure if anyone actually uses them and b) They are removed from POWER10
    • saagarjha 6y ago
      I don't think Apple generates those, though.
  • gandutraveler 6y ago
    Can that secret sauce just be to slow down Intel based macs in the OS layer?