Thomas Bushnell BSG <xxxxxx@becket.net> writes:

> You could turn on a special "track source on NaNs" feature, which
> squirrels away, say, a complete stack record (or something less
> perhaps, depending on what you ask for), and then every NaN generated
> now gets tagged with a *very* nice handle for debugging.

This can be done by changing the implementation of arithmetic to
produce those special values with traces *instead* of regular NaNs.
There is no need to change the semantics of IEEE NaNs.

--
   __("<         Marcin Kowalczyk
   \__/       xxxxxx@knm.org.pl
    ^^     http://qrnik.knm.org.pl/~qrczak/