Nothing about my post has anything to do with assembly. You asked for, and I quote "Show me some O2 optimizations that will act contrary to code I wrote - meaning they violate the “as if” rule." and I provided just that. You can go on the link I provided, switch back and forth between O2 and O0 and see different observable behavior which violates the as-if rule.

I'm not sure why you're bringing up assembly but it suggests that you might not correctly understand the example I provided for you, which I reiterate has absolutely nothing to do with assembly.