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Message-ID: <20130730022621.GF25714@port70.net>
Date: Tue, 30 Jul 2013 04:26:21 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: Conformance issues to address after 0.9.12 release
* Rich Felker <dalias@...ifal.cx> [2013-07-29 17:04:48 -0400]:
> On Mon, Jul 29, 2013 at 06:00:46PM +0200, Szabolcs Nagy wrote:
> > * Rich Felker <dalias@...ifal.cx> [2013-07-29 02:34:56 -0400]:
> > > - i387 math asm does not truncate excess precision. Whether or not
> > > this omission is conforming in terms of the return value, it results
> > > in lost underflow exceptions, as demonstrated by nsz's math tests.
> >
> > the underflow problem is not i387 or excess precision related:
> > many (odd) math functions are almost the identity function
> > around x==0 (sin,asin,tan,atan,sinh,atanh,..)
>
> In the case of asin, etc it _is_ the excess precision.
>
ah yes functions with x87 asm are different
but the c code for asin has the issues i described
so it should fail to raise underflow on arm as well
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