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Re:Brad Cox has died by AJRF on Saturday January 23, 2021 @04:45AM (#25881016)
The compiler does some very fancy stuff with objc_msgSend to make it fast, and the selectors are interned.

https://www.mikeash.com/pyblog/objc_msgsends-new-prototype.h...

Re:Brad Cox has died by donarb on Saturday January 23, 2021 @02:10PM (#25885168)
Objective-C had an IMP pointer, essentially a function pointer. If you needed to send a message to an object in a tight loop, you could extract the pointer before the loop and use it inside.