| ▲ | wvenable 3 days ago | |
I believe it's the `lock xadd` instruction. It's faster when combined with x86 Total Store Ordering mode that the Rosetta emulation runs under. | ||
| ▲ | saagarjha 3 days ago | parent [-] | |
Looking at objc_retain apparently it's a lock cmpxchg these days | ||