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Marcin 'Qrczak' Kowalczyk <qrczak@xxxxxxxxxx> writes: > Thomas Bushnell BSG <tb@xxxxxxxxxx> 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. Who said anything about changing the semantics of IEEE NaNs?