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Yes, I am "attacking" his particular suggestion with the reasoning of this particular UB. I disagree that these concerns are independent, as the reasoning for the UB is often, that any choice per se would be limiting the possible compiler behaviour. It is not a particular choice, that would be limiting, but the act of picking one per se.

> What people want is for a compiler that assumes that all pointers are aligned to use an aligned store or load instruction whenever the compiler wants to issue such an instruction.

That requires a mental model of a compiler, that runs through the code linearly and emits instructions in the order defined by the code. That's not what is happening. Current compilers model the value flow through the code, and then emit a program that happen to output the same values for the valid input.

> In other words, they want the compiler to stick with the decision it made

What instead often happens is, that the compiler doesn't even emit a decision at all, because that is completely irrelevant.