Andrei Alexandrescu wrote:
1. Is it usual to change the FP flags in an application multiple times, or not? (I never changed them, so please be easy on me.)
Given a complex calculation, one might want to know how sensitive the result is to roundoff error. Calculating this exactly can be a daunting task, but you can get a rough-and-ready estimate of it by running the calculation 3 times:
1. with round to nearest (the default) 2. with round up 3. with round down and comparing the results. I don't really know of any other uses.
2. Is one FP flag setup much more often used than others? If so, we could define pure functions assuming the often-used setup and then some impure functions using any other setup.
I'm not ready to face the prospect of two versions of each math function :-(
