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Message-ID: <ZrJFS7IKq3cuM6v1@voyager>
Date: Tue, 6 Aug 2024 17:46:19 +0200
From: Markus Wichmann <nullplan@....net>
To: musl@...ts.openwall.com
Cc: Damian McGuckin <damianm@....com.au>
Subject: Re: Special cases in csinh and ctanh
Am Wed, Aug 07, 2024 at 12:02:59AM +1000 schrieb Damian McGuckin:
> I realise that 'y - y' creates a NaN when y is either an Infinity or NaN.
> Won't that also raise an INVALID exception?
>
Yes it will. As it should, since it calculates a new NaN where there
wasn't one before (and, one layer up, csinh(0 + ∞ i) IS an invalid
operation). y - y does NOT raise invalid if y already is QNaN.
> What does
>
> x * (y - y)
>
> achieve that y - y does not (in the above)
>
The version in ctanh() sets the real part to 0 if x is zero, while the
above always calculates NaN if y is not finite. Otherwise, the sign bit
may be different, whatever information the sign bit of a NaN has.
Ciao,
Markus
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