<i> Whatever your dragon told you, he lied. Dragons are deceitful. You do not know what awaits you on the other side. <Tgsri>
Michael Swanvik. "The daughter of an iron dragon"
Not so long ago on Habr a post was published under the name "<a href="https://habrahabr.ru/company/infopulse/blog/338812/"> How can the function never called be called? <Tgsrcut>". The conclusion from the article is simple: in the case of undefined behaviour, the compiler has the right to take any actions, even if they are completely unexpected. However, I was interested in the very mechanism of this optimization. The result of my small research I want to share with the distinguished community of the hubra.