John Carmack recently said he implements alternatives "in parallel" so he can compare them, instead of by branching http://news.ycombinator.com/item?id=3266741

John Carmack recently said he implements alternatives "in parallel" so he can compare them, instead of by branching http://news.ycombinator.com/item?id=3266741 http://news.ycombinator.com/item?id=3266741 [my definition: branching is non-code ad hoc compile-time polymorphism at an arbitrary set of points]