I don’t understand the down votes. Conducting empirical research on the performance impact of undefined behavior is fantastically needed, as the C++ committee’s obsession with undefined behavior strictness (in contrast with longstanding semantics, e.g., uninitialized memory accesses being just fine) has been justified largely by how they enable optimizing compilers. This research shows that many types of UB have a negligible impact on performance.
Possibly somebody downvoted because "thank you" in all caps is not a substantial contribution to discussion. It feels like the kind of low effort stuff you'd see on reddit.
Also, commenting on downvotes is generally frowned upon.
You're getting downvoted because you're looking for a particular result ("UB optimizations don't help performance") rather than actually evaluating the quality of this analysis (which doesn't really support what you want anyway).
