4 ms·

ARM macs apparently have some kind of specific handling in place for this when a process is running with x86_64 compatibility, but it’s not publicly documented

by omcnoe 6mo ago

ARM macs apparently have some kind of specific handling in place for this when a process is running with x86_64 compatibility, but it’s not publicly documented anywhere that I can see.

my123 6mo ago
XNU has this oddity: https://github.com/apple-oss-distributions/xnu/blob/f6217f891ac0bb64f3d375211650a4c1ff8ca1ea/osfmk/arm64/sleh.c#L1756 https://github.com/apple-oss-distributions/xnu/blob/f6217f89... Redacted from open source XNU, but exists in the closed source version
- omcnoe 6mo ago
  Is it actually redacted, or just a leftover stub from a feature implemented in silicon instead of software? Isn't the x86 memory order compatibility done at hardware level?
  - my123 6mo ago
    Redacted