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Date: Mon, 29 Jul 2013 17:04:48 -0400
From: Rich Felker <>
Subject: Re: Conformance issues to address after 0.9.12 release

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


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