The standard defines "based on" by talking about hypothetical alternative executions where the original value has a different value. In those executions, the ac

The standard defines "based on" by talking about hypothetical alternative executions where the original value has a different value. In those executions, the access in question does not even happen in my program. What this goes to show is that the definition in the standard is ill-formed -- this can happen because the standard is written in English rather than a formal, mathematical language. However, I think it is quite clear that the intention of the standard is to allow my program. It would certainly allow the alternative where the `if (xaddr == y2addr) {` is removed and its body (then-branch) put directly into the main function. It makes no sense to disallow this program just because it introduces an extra condition, ergo I claim this program has defined behavior.