The downvotes on the OP comment and the negativity in the replies is totally baffling to me. The OP's post was interesting and relevant, despite being non-algorithmic examples. Non-algorithmic examples are not required by the title of the article, and are only implicitly the topic of the article's body, and even if it were explicit, that still wouldn't render the OP comment unrelated. It would have been enough to simply talk about the difference between an algorithmic and language-feature solution without implying something is wrong with even posting the latter.
And on a modern CPU the machine code does not map 1-to-1 to what actually happens when this is executed, the phrase "out-of-order execution" ought to give away that even though your machine code says A, then B, then C, the CPU may decide it was better to do A, then C, then B instead.
Express your actual intent, if your chosen language has a "swap" intrinsic, use it, if not write the swap in a natural and idiomatic way, and let other people do the lifting.
