[cfp-interest 3608] Quiet/Signaling NaNs

Damian McGuckin damianm at esi.com.au
Mon Sep 22 17:53:04 PDT 2025


Currently, F.3#7 says

The signbit macro, providing the ISO/IEC 60559 isSignMinus operation, 
determines the sign of its argument value as the sign bit of the values 
representation. This applies to all values, including NaNs whose sign bit 
is not generally interpreted by ISO/IEC 60559.

As per F.2.2#3, this use of NaN would mean a quiet NaN only.

Should not the end of that sentence read as

.... all values, including <<< both quiet and signaling >>> NaNs whose 
sign bit is not generally interpreted by ISO/IEC 60559.

where obviously my extraneous use of <<< and >>> will disappear.

Thanks - Damian


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