[bogomipz]

>"We've had partial register stalls, merging uops, and other weird behavior (for example, ah today works very differently from al)."

Can you elaborate on the last behavior, that " ah today works very differently from al"? How do they differ? I hadn't heard this before.

[BeeOnRope]

You can find all the gory details at:

https://stackoverflow.com/a/45660140/149138