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Date: Tue, 25 Feb 2020 21:59:14 +0000
From: Joseph Myers <>
To: <>
Subject: Re: Behavior of function nan()

On Tue, 25 Feb 2020, enh wrote:

> btw, note that NAN is equivalent to nanf(3), not nan(3).

And that a default float NaN, converted to double, may not be the same as 
a default double NaN - but if you don't care about NaN payloads anyway, 
that probably doesn't matter.

TS 18661-1 and C2x (Annex F only, not in the main standard) define 
setpayload functions to return a NaN with a given payload in a portable 

Joseph S. Myers

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