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A comment on x86-64 Assembly Language Programming with Ubuntu. Parent comment

Re:x86-64 Assembly Language Programming with Ubuntu by bogomipz on Saturday September 01, 2018 @09:11AM (#17891656)
>"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.

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Re:x86-64 Assembly Language Programming with Ubuntu by BeeOnRope on Saturday September 01, 2018 @10:40AM (#17892033)
You can find all the gory details at:

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

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