> it would be reasonable to try to follow the standard, unless it's stupid, > ill-advised, or impossible (or all three).
Not impossible, maybe a bit tricky to stop the linkers from reordering things. The cost would be (at least) one extra instruction for each 'if' statement with a floating point inequality and no 'else' clause. Ron, are you still reading this list? What do your numerical colleagues think about NaNs?