If you're thinking about energy consumption in programming, this article is very interesting: "C Is Not a Low-level Language" https://queue.acm.org/detail.cfm

If you're thinking about energy consumption in programming, this article is very interesting: "C Is Not a Low-level Language" https://queue.acm.org/detail.cfm?id=3212479 https://queue.acm.org/detail.cfm?id=3212479 > On a modern high-end core, the register rename engine is one of the largest consumers of die area and power. To make matters worse, it cannot be turned off or power gated while any instructions are running, which makes it inconvenient in a dark silicon era when transistors are cheap but powered transistors are an expensive resource.