linux-kernel - Re: math-emu issue with fp divide

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Date:	Wed, 4 Jun 2008 21:42:55 +0000 (UTC)
From:	"Joseph S. Myers" <joseph@...esourcery.com>
To:	Kumar Gala <galak@...nel.crashing.org>
cc:	David Miller <davem@...emloft.net>,
	lkml List <linux-kernel@...r.kernel.org>,
	libc-alpha@...rceware.org
Subject: Re: math-emu issue with fp divide

On Wed, 4 Jun 2008, Kumar Gala wrote:

> I'm trying to move the powerpc math-emu
> code to use the include/math-emu bits.

I'd like to remind people that the include/math-emu code is based on an 
old, buggy version of the soft-fp code in glibc.  RTH previously noted 
<http://sourceware.org/ml/libc-alpha/2006-02/msg00075.html> that the fixes 
should go in the kernel, when approving a patch of mine fixing various 
bugs and speeding up soft-fp, and several more bugs have been fixed since 
then in the course of GCC work on soft-float for Power and __float128 
support for x86_64.

So it may be better than the old code you're replacing, but it might still 
be a good idea to merge things with the current glibc code, as a matter of 
both correctness and performance.  (And there may well still be bugs left 
in the code.)

-- 
Joseph S. Myers
joseph@...esourcery.com
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