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Message-ID: <20180410230849.GK4418@port70.net>
Date: Wed, 11 Apr 2018 01:08:50 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: catan errors
* Rich Felker <dalias@...c.org> [2018-04-10 15:50:07 -0400]:
>
> 3. Is only possible if y==1.0 and x==0.0, which is the only real
> exceptional case for atan: z==I.
>
> I opted to replace the non-obvious (3) with an explicit check for z==I
> but this isn't necessary.
>
...
> t = y - 1.0;
> a = x2 + (t * t);
> - if (a == 0.0)
> - goto ovrf;
why does a==0 imply x==0?
if |x| < sqrt(2)*0x1p-538, x2 underflows to 0 in nearest rounding mode.
to handle this correctly extra work would need to be done, so i think
either way is fine (leaving the goto there or not are both wrong, but
we dont guarantee correct complex functions yet)
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