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From: Szabolcs Nagy <nsz@port70.net>
To: musl@lists.openwall.com
Subject: Re: Conformance issues to address after 0.9.12 release
Date: Tue, 30 Jul 2013 04:26:21 +0200	[thread overview]
Message-ID: <20130730022621.GF25714@port70.net> (raw)
In-Reply-To: <20130729210448.GG4284@brightrain.aerifal.cx>

* Rich Felker <dalias@aerifal.cx> [2013-07-29 17:04:48 -0400]:

> On Mon, Jul 29, 2013 at 06:00:46PM +0200, Szabolcs Nagy wrote:
> > * Rich Felker <dalias@aerifal.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


  reply	other threads:[~2013-07-30  2:26 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-29  6:34 Rich Felker
2013-07-29 16:00 ` Szabolcs Nagy
2013-07-29 21:04   ` Rich Felker
2013-07-30  2:26     ` Szabolcs Nagy [this message]
2013-08-12 19:27       ` Szabolcs Nagy
2013-08-13  3:32         ` Rich Felker
2013-08-13  3:45           ` Szabolcs Nagy
2013-08-13  4:25             ` Rich Felker

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