[Cfp-interest] draft of syntax discussion for C committee

[David Hough CFP]

> some HW might not provide any way for a program to detect underflow exceptions


If you don't have traps, catch inexact underflows by testing the underflow 
flag, during or at the end of the try clause.

However you have to check for exact underflows
by checking each result within the try clause to see if it's subnormal.
That can't be efficient.    

Perhaps an optimization pragma will be needed that allows checking only
for inexact underflows.