[dzdt]

I guess he means the retpoline. On the 6502 there is no indirect jump instruction, so you need such tricks just to achieve an indirect jump at all.

[pubby]

There's an indirect jump instruction. It's not very good though, and has a notorious bug with addresses ending in 0xFF.

[dzdt]

Gah, you're right. Guess my memory is fading. There is indirect JMP, but no indirect JSR or indirect branches. And the indirect JMP as you say is not very useful.