[userbinator]

It has a bit less gain on a RISC due to the code density (or lack thereof), since it requires more fetch bandwidth. Apple works around this by using a very wide front-end: https://news.ycombinator.com/item?id=25257932

[_chris_]

x86-64 code density is more than 4 bytes / instruction.

[saagarjha]

That looks like inverse density.

[chrisseaton]

Isn’t that the point?