I think only when you think this kind of calculation is actually the hotspot of your code, and you should put a lot of effort to optimize it, then you could con

I think only when you think this kind of calculation is actually the hotspot of your code, and you should put a lot of effort to optimize it, then you could consider to do such things. It is not something about complexity and code size, it is about the performance optimization. I used to optimize a C++ application with SIMD intrinsics. The most time consuming function of this app is a linear algebra algorithm. That could perfectly fit this kind of optimization. However, writing this kind of code and debug it took me a lot of time. I would say for most of "normal" application, it is useless.