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Re: Signaling NaNs

From: Bruno Haible
Subject: Re: Signaling NaNs
Date: Fri, 10 Dec 2021 10:13:18 +0100

Marc Nieper-Wißkirchen wrote:
> I could reformulate my question to: "Is there a way to produce a (quiet)
> NaN that won't occur as a result of the C library functions?"

There are 2^51 possible quiet NaNs [1]. I would guess that the hardware and
libc functions produce only a small portion of this space (because what
would be the point of encoding additional information in the result of
0.0 / 0.0, sqrt(-31.2), acos(-1.4), etc.?). But I don't really know.
You would need to find out yourself.


[2] https://en.wikipedia.org/wiki/Double-precision_floating-point_format

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