"As opposed to load-linked/store-conditional, which is a different way to express the same basic idea? Or is he claiming that other processors didn't support an

"As opposed to load-linked/store-conditional, which is a different way to express the same basic idea? Or is he claiming that other processors didn't support any form of atomic instructions, which definitely isn't true?" It refers specifically to things like fetch_and_add. Supported by risc-v and i64.