Date: Tue, 10 Apr 2018 16:32:06 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: catan errors On Tue, Apr 10, 2018 at 05:23:12PM -0300, dgutson . wrote: > On Tue, Apr 10, 2018 at 4:50 PM, Rich Felker <dalias@...c.org> wrote: > > > The OpenBSD catan implementation we're using has a number of > > nonsensical "overflow" (goto ovrf) conditions that aren't errors, > > reported by mepholic on irc. I think the attached patch fixes them > > without introducing new problems, but I'm not sure if any other > > problems remain. > > > > Note that, of the three cases removed: > > > > 1. Is not an exceptional case at all, and made no sense to begin with. > > > > 2. Is only exceptional if x and a are both zero; atan(2x,0) is > > perfectly well-defined. > > > > 3. Is only possible if y==1.0 and x==0.0, which is the only real > > exceptional case for atan: z==I. > > > > > Besides the trigonometric case, are you considering de-normalized numbers, > such as 4.94066e-324 as divisor? > For example: > double x = 1.0; > double y = 5E-324; > x / y is inf, and y != 0.0. > Shouldn't 'a' be checked against that number or its absolute value >= > minimum? Can you clarify where you think something goes wrong? Rich
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