Especially the fact that loading a library compiled with GCC and fast math on, can modify the global state of the program... It's one of the most baffling decisions made in the name of performance.

I would really like for someone to take fast math seriously, and to provide well scoped and granular options to programmers. The Julia `@fastmath` macro gets close, but it is two broad. I want to control the flags individually.

Also the question how that interacts with IPO/inlining...