With AMD Zen 4, It's Surprisingly Not Worthwhile Disabling CPU Security Mitigations

[coder]

We are already looking ahead over 10000 µOPs.

BTB is not the same as speculative execution. It's really a type of cache.

The key stat you should look to is the Re-Order Buffer size. For Zen 4, it sits at 320. Golden Cove's is 512. Meanwhile, the one in Apple's A14 is 630!

https://www.anandtech.com/show/16226...14-deep-dive/2

[Anux]

BTB is not the same as speculative execution. It's really a type of cache.

You are right, I read a little more, it sounds like BTB is a read ahead to fill the µOP cache for the branch predictor?

[geearf]

We are already looking ahead over 10000 µOPs.

BTB is not the same as speculative execution. It's really a type of cache.

The key stat you should look to is the Re-Order Buffer size. For Zen 4, it sits at 320. Golden Cove's is 512. Meanwhile, the one in Apple's A14 is 630!

https://www.anandtech.com/show/16226...14-deep-dive/2

Thank you both!