Well, it could "break" your code in that it might make your code produce different results than a separate equivalent implementation that didn't use FMA. Edit:

Well, it could "break" your code in that it might make your code produce different results than a separate equivalent implementation that didn't use FMA. Edit: Ok actually it sounds like it could literally break some algorithms, see https://news.ycombinator.com/item?id=21342974 https://news.ycombinator.com/item?id=21342974